CN109782230B - Free sound field small-sized acoustic holographic measurement and inversion device - Google Patents

Abstract

The present invention is a free sound field small-scale acoustic holographic measurement and inversion device, which relates to an acoustic test and acoustic inversion device. The device includes a whole device support adjustment mechanism I, a microphone array longitudinal motion control mechanism II, and a microphone array rotary motion control mechanism III. Microphone array vertical motion control mechanism IV, microphone array lateral motion control mechanism V, microphone correction control mechanism VI, virtual ball setting reference position positioning measurement column VII; the installation and debugging of this device are relatively simple, and the measurement and inversion calculation can be Reducing a lot of manpower and material resources can reduce people's labor intensity, improve the accuracy of measurement data and inversion calculation results, and is especially suitable for large-scale free, complex and stable field operations.

Description

A small acoustic holographic measurement and inversion device in free sound field

Technical Field

The invention relates to an acoustic measurement and inversion device, in particular to a new free-sound-field small-scale acoustic holographic measurement and inversion device.

Background Art

Near-field acoustic holography technology has been a hot topic in acoustic research in recent years. Through near-field acoustic holography (NAH), sound source identification and positioning can be performed more accurately. This technology can be used to achieve near-field sound field reconstruction and visualization. Therefore, the research on NAH technology has very important practical significance for suppressing noise pollution. The key to NAH technology is how to measure the complex sound pressure distribution on the holographic surface and how to use the complex sound pressure on the holographic surface to acoustically invert the free sound field. However, the existing test devices and inversion devices are relatively bulky, and debugging and installation are very troublesome. The workload is very large, requiring a large amount of manpower and material resources, and the test results generally cannot be completed on-site. The inversion calculation needs to be returned to the laboratory for processing. Therefore, it is necessary to invent a small, lightweight new multi-holographic testing and inversion device. The device is under the control of the corresponding intelligent control system (which is not the focus of the present invention and is not described in detail here, see the intelligent control system of the device applied for on the same day as the present invention). It can automatically debug, automatically calibrate, automatically test, and automatically calculate the inversion results on-site to reduce a large amount of manpower and material resources and reduce people's labor intensity. At the same time, it is particularly suitable for on-site operations in large, complex, free and stable sound fields.

Summary of the invention

The purpose of the present invention is to provide a small and lightweight new sound pressure testing and acoustic inversion device to address the defects of the prior art. The device is relatively simple to install and debug, and various holographic surfaces can be selected during measurement. A large amount of manpower and material resources can be reduced during measurement and acoustic inversion, and people's labor intensity can be reduced. At the same time, new correction and calculation methods are used during data measurement, which greatly improves the accuracy of measurement data. In addition, the measurement and inversion device uses an embedded system, which can make the device very small. In particular, parallel processing technology is used in the embedded system, and calculation results can be obtained on-site, so it is particularly suitable for on-site operations.

To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a free-field small-scale acoustic holographic measurement and inversion device, which includes a support adjustment mechanism I for the entire device, a microphone array longitudinal motion control mechanism II, a microphone array rotational motion control mechanism III, a microphone array vertical motion control mechanism IV, a microphone array lateral motion control mechanism V, a microphone correction control mechanism VI, and a virtual ball setting reference position positioning measurement column VII; the support adjustment mechanism I for the entire device includes an adjustment support I, an adjustment support II, and an adjustment support III, and the three adjustment supports are respectively connected to the screw holes on the base plate through their own screw motors, and a fixed counterweight round table is provided on the base plate, and the fixed counterweight round table is fixed on the base plate, and a horizontal position sensor K1 and a horizontal position sensor K2 are also provided on the base plate, and the upper surface of the fixed counterweight round table is connected to the vertical The vertical support rod is connected to the vertical support rod, the upper end of the vertical support rod is connected to the longitudinal and rotational motion component installation platform, the upper end of the vertical support rod is also provided with a laser receiver, and the side of the longitudinal and rotational motion component installation platform is provided with an electrical box and a micro liquid crystal display touch screen; the microphone array rotational motion control mechanism III includes a first stepper motor D1 and a second stepper motor D2 arranged under the longitudinal and rotational motion component installation platform, the first stepper motor D1 is connected to one of the gears of the upper special-shaped gear pair I arranged on the longitudinal and rotational motion component installation platform through a bearing, the second stepper motor D2 is connected to another gear of the special-shaped gear pair I through a bearing, and the special-shaped gear pair I is respectively connected to the longitudinal motion component S1 and the longitudinal motion component S2 of the longitudinal motion control mechanism II through a mechanical connection component arranged on the longitudinal and rotational motion component installation platform; the microphone array The longitudinal motion control mechanism II includes a longitudinal motion component S1 and a longitudinal motion component S2, which are respectively connected to the special-shaped gear pair I through a mechanical connection component. The longitudinal motion component S1 is also connected to the frame G3 of the vertical motion component S1 through its screw sleeve I, and the longitudinal motion component S2 is also connected to the frame G4 of the vertical motion component S2 through its screw sleeve II; the microphone array vertical motion control mechanism IV includes a vertical motion component S1 and a vertical motion component S2, the vertical motion component S1 is connected to the base T2 of the microphone array main mounting arm S2 of the microphone array lateral motion control mechanism V through its screw sleeve III, and the vertical motion component S2 is connected to the base T1 of the microphone array main mounting arm S1 of the microphone array lateral motion control mechanism V through its screw sleeve IV; the microphone array lateral motion control mechanism V includes The invention comprises a microphone array main mounting arm S1, a microphone array main mounting arm S2, a plurality of microphone array sub-mounting arms, and a plurality of microphones, wherein the microphone array sub-mounting arms are respectively mounted on the microphone array main mounting arm S1 and the microphone array main mounting arm S2, and the microphones are mounted on the microphone array sub-mounting arms; the microphone correction control mechanism VI comprises a microphone correction mechanism I and a microphone correction mechanism II, and the microphone correction mechanism I and the microphone correction mechanism II are respectively fixed on the vertical motion component S2 and the vertical motion component S1; the adjustment support I comprises a screw motor M1 and a base I, and the screw motor M1 is installed in the base I; the adjustment support II comprises a screw motor M2 and a base II, and the screw motor M2 is installed in the base II; the adjustment support III comprises a screw motor M3 and a base III, and the screw motor M3 is installed in the base III.

The longitudinal motion component S1 described in the further technical solution of the present invention includes a frame G1, a bearing S1, a screw rod I, a screw rod sleeve I, a bearing S2, a gear pair II, and a third stepping motor D3. The inner surface of one of the two longitudinal plates of the frame G1 is provided with a slide groove II, and the inner surface of the other plate is provided with a slide groove I. The bearing S2 is fixed on one of the two transverse plates of the frame G1, and the bearing S2 is connected to one end of the screw rod I. The bearing S1 is fixed on the other transverse plate of the frame G1, and the bearing S1 is connected to the other end of the screw rod I. The screw rod I passes through the bearing S1 and is connected to one of the gears in the gear pair II. The other gear in the gear pair II is connected to the third stepping motor D3. The screw rod sleeve I is sleeved on the screw rod I, and the transverse rods of the screw rod sleeve I are respectively placed on the slide groove I and the slide groove II; the longitudinal motion component S1 includes a bearing S1, a screw rod I, a screw rod I sleeve, and a gear I is connected to the third stepping motor D3. The forward motion component S2 includes a frame G2, a bearing S3, a screw rod II, a screw rod sleeve II, a bearing S4, a gear pair III, and a fourth stepping motor D4. The inner surface of one of the two longitudinal plates of the frame G2 is provided with a slide groove IV, and the inner surface of the other plate is provided with a slide groove III. The bearing S4 is fixed on one of the two transverse plates of the frame G2. The bearing S4 is connected to one end of the screw rod II. A bearing S3 is fixed on the other transverse plate of the frame G2. The bearing S3 is connected to the other end of the screw rod II, and the screw rod II passes through the bearing S3 and is connected to one of the gears in the gear pair III. The other gear in the gear pair III is connected to the fourth stepping motor D4. The screw rod sleeve II is sleeved on the screw rod II, and the transverse rods of the screw rod sleeve II are respectively placed on the slide groove III and the slide groove IV; The vertical motion component S1 includes a frame G3, a bearing S5, a screw rod III, a screw rod sleeve III, a bearing S6, a gear pair IV, and a fifth stepping motor D5. The inner surface of one of the two longitudinal plates of the frame G3 is provided with a slide groove VI, and the inner surface of the other plate is provided with a slide groove V. The bearing S6 is fixed on one of the two transverse plates of the frame G3. The bearing S6 is connected to one end of the screw rod III. The other transverse plate of the frame G3 is fixed with a bearing S5. The bearing S5 is connected to the other end of the screw rod III, and the screw rod III passes through the bearing S5 and is connected to one of the gears in the gear pair IV. The other gear in the gear pair IV is connected to the fifth stepping motor D5. The screw rod sleeve III is sleeved on the screw rod III, and the transverse rods of the screw rod sleeve III are respectively placed on the slide groove V and the slide groove VI. The vertical motion component S2 includes a frame G4, a bearing S7, a screw rod IV, a screw rod sleeve IV, a bearing S8, a gear pair V, and a sixth stepping motor D6. The inner surface of one of the two longitudinal plates of the frame G4 is provided with a slide groove VIII, and the inner surface of the other plate is provided with a slide groove VII. The bearing S8 is fixed on one of the two transverse plates of the frame G4. The bearing S8 is connected to one end of the screw rod IV. A bearing S7 is fixed on the other transverse plate of the frame G4. The bearing S7 is connected to the other end of the screw rod IV, and the screw rod IV passes through the bearing S7 and is connected to one of the gears in the gear pair V. The other gear in the gear pair V is connected to the sixth stepping motor D6. The screw rod sleeve IV is sleeved on the screw rod IV, and the transverse rods of the screw rod sleeve IV are respectively placed on the slide grooves VII and VIII.

A further technical solution of the present invention is a microphone array main mounting arm S1 comprising a base T1, one end of the base T1 is provided with a bearing S10, the other end is provided with a bearing S9, the middle of the base T1 is hollow, and a gear rod I is installed, the two ends of the gear rod I are respectively fixed on the bearing S10 and the bearing S9, a stepper motor D7 is provided on one side of the base T1, the stepper motor D7 is fixed on the base T1, a gear W1 is installed on the shaft of the seventh stepper motor D7, the gear W1 is meshed with the gear rod I through a notch I, a plurality of opening grooves are provided on the other side of the base T1 for installing the microphone array sub-mounting arms, and a calibration microphone I is also provided on the upper end of the base T1; the microphone array main mounting arm S2 comprises a base T2, one end of the base T2 is provided with a There is a bearing S12, and a bearing S11 is provided at the other end. The middle of the base T2 is hollow and equipped with a gear rod II. The two ends of the gear rod II are respectively fixed on the bearing S12 and the bearing S11. An eighth stepper motor D8 is provided on one side of the base T2, and the eighth stepper motor D8 is fixed on the base T2. A gear W2 is installed on the shaft of the eighth stepper motor D8. The gear W2 engages with the gear rod II through the notch II. A plurality of open grooves are provided on the other side of the base T2 for installing a microphone array sub-mounting arm. A calibration microphone II is also provided on the upper end of the base T1; the microphone array sub-mounting arm 22) includes a base plate, racks are provided on both sides of the back of the base plate, and a plurality of microphone insertion bases are provided on the front side, and the microphones are inserted into the microphone insertion bases.

The microphone correction control mechanism I described in the further technical solution of the present invention includes a ninth stepper motor D9, a sleeve I, a microphone insertion port I, a micro-muffler chamber I, a reciprocal acoustic transducer G1, a spring I, a connector L1, a reciprocal acoustic transducer G2, an electromagnet P1, a double slide groove C1, and an electromagnetic coil U1. The ninth stepper motor D9 is fixed on the frame G4 of the vertical motion component S2. The ninth stepper motor D9 is connected to one end of the connector L1 through a screw rod. The connector L 1 and the other end is connected to the sleeve I, a cylindrical semi-through hole is provided inside the sleeve I, a double slide groove C1 and an electromagnet P1 are provided in the hole, the ear rod of the electromagnet P1 is placed in the double slide groove C1, and an electromagnetic coil U1 is provided on the electromagnet P1, a spring I is sleeved on the other end of the electromagnet P1 and connected to the micro-muffler I, a reciprocal acoustic transducer G1 is provided at one end inside the micro-muffler I, and a reciprocal acoustic transducer G2 is provided at the other end, and a microphone insertion port I is provided in the middle of the micro-muffler I; The microphone correction control mechanism II includes a tenth stepper motor D10, a sleeve II, a microphone insertion port II, a micro-muffler chamber II, a reciprocal acoustic transducer G3, a spring II, a connector L2, a reciprocal acoustic transducer G4, an electromagnet P2, a double slide groove C2, and an electromagnetic coil U2. The tenth stepper motor D10 is fixed on the frame G3 of the vertical motion component S1. The tenth stepper motor D10 is connected to one end of the connector L2 through a screw rod, and the other end of the connector L2 is connected to the The sleeve II is connected, and a cylindrical semi-through hole is provided inside the sleeve II, and a double slide groove C2 and an electromagnet P2 are provided in the hole. The ear rod of the electromagnet P2 is placed on the double slide groove C2. At the same time, the electromagnet P2 is provided with an electromagnetic coil U2. The other end of the electromagnet P2 is sleeved with a spring II and connected to the miniature anechoic cavity II. A reciprocal acoustic transducer G3 is provided at one end of the miniature anechoic cavity II, and a reciprocal acoustic transducer G4 is provided at the other end. In addition, a microphone insertion port II is provided in the middle of the miniature anechoic cavity II.

According to a further technical solution of the present invention, the virtual ball setting reference position measurement column VI comprises a bracket, the bracket is connected to a vertical rod, a laser transmitter is provided at the upper end of the vertical rod, and a microphone socket is provided at the upper end.

Due to the above structure, the free-field small-scale acoustic holographic measurement and inversion device of the present invention has the following beneficial effects:

1) The device is simple, lightweight and easy to debug.

The present invention provides a small-scale acoustic holographic measurement and inversion device in a free sound field. The device has a simple structure and is very light, thus overcoming the disadvantage of being bulky in previous devices. After simple installation, all subsequent tests and inversion calculations are automatically performed under the control of a control system (which is not the focus of the present invention and will not be described in detail herein), without the need for human intervention. This can greatly save manpower and material resources and reduce people's labor intensity, which is particularly evident in free, complex and stable sound fields with large-scale, multi-point tests and multiple inversions.

2) It can make data testing and calculation more accurate and reliable.

The invention discloses a small-sized acoustic holographic measurement and inversion device in a free sound field. Since most of the work does not require human intervention, human errors are reduced, so the test data and the inversion results are more reliable and accurate.

The following is a further description of a free-field small-scale acoustic holographic measurement and inversion device of the present invention in conjunction with the accompanying drawings and embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the overall structure of a free-field small-scale acoustic holographic measurement and inversion device according to the present invention;

FIG2 is a partial schematic diagram of the supporting structure of a free-field small-scale acoustic holographic measurement and inversion device according to the present invention;

3 is a partial schematic diagram of a longitudinal and vertical motion assembly and a microphone correction mechanism of a free-field small-scale acoustic holographic measurement and inversion device according to the present invention;

4 is a schematic structural diagram of a microphone array main mounting arm S1 of a free-field small-scale acoustic holographic measurement and inversion device according to the present invention;

5 is a schematic structural diagram of a microphone array main mounting arm S2 of a free-field small-scale acoustic holographic measurement and inversion device according to the present invention;

6 is a schematic diagram of the top view of the longitudinal motion component S1 of a free-field small-scale acoustic holographic measurement and inversion device according to the present invention;

7 is a schematic diagram of the upward structure of a longitudinal motion component S1 of a free-field small-scale acoustic holographic measurement and inversion device according to the present invention;

FIG8 is a schematic diagram of the top view structure of a longitudinal motion component S2 of a free-field small-scale acoustic holographic measurement and inversion device according to the present invention;

9 is a schematic diagram of the upward structure of the longitudinal motion component S2 of a free-field small-scale acoustic holographic measurement and inversion device of the present invention;

10 is a schematic diagram of the top view of the vertical motion component S1 of a free-field small-scale acoustic holographic measurement and inversion device of the present invention;

11 is a schematic diagram of the upward structure of a vertical motion component S1 of a free-field small-scale acoustic holographic measurement and inversion device according to the present invention;

12 is a schematic diagram of the top view of the vertical motion component S2 of a free-field small-scale acoustic holographic measurement and inversion device according to the present invention;

13 is a schematic diagram of the upward structure of a vertical motion component S2 of a free-field small-scale acoustic holographic measurement and inversion device according to the present invention;

FIG14 is a schematic diagram of the internal structure of an adjustment support I of a free-field small-scale acoustic holographic measurement and inversion device according to the present invention;

FIG15 is a schematic diagram of the internal structure of an adjustment support II of a free-field small-scale acoustic holographic measurement and inversion device according to the present invention;

FIG16 is a schematic diagram of the internal structure of an adjustment support III of a free-field small-scale acoustic holographic measurement and inversion device according to the present invention;

17 is a schematic structural diagram of a microphone correction mechanism I of a free-field small-scale acoustic holographic measurement and inversion device according to the present invention;

18 is a schematic diagram of the internal structure of a microphone correction mechanism I of a free-field small-scale acoustic holographic measurement and inversion device according to the present invention;

19 is a schematic structural diagram of a microphone correction mechanism II of a free-field small-scale acoustic holographic measurement and inversion device according to the present invention;

FIG20 is a schematic diagram of the internal structure of a microphone correction mechanism II of a free-field small-scale acoustic holographic measurement and inversion device according to the present invention;

21 is a schematic diagram of the installation of a microphone array arm and a microphone in a sub-mounting arm of a free-field small-scale acoustic holographic measurement and inversion device according to the present invention;

22 is a diagram of a free-field small-scale acoustic holographic measurement and inversion device virtual ball setting reference position measurement column VI of the present invention;

FIG. 23 is a schematic diagram of the electromagnets P1 and P2 of a small acoustic holographic measurement and inversion device in a free sound field according to the present invention.

FIG24 is a side view of an opening groove on a substrate T1 and T2 of a free-field small-scale acoustic holographic measurement and inversion device according to the present invention;

FIG25 is a block diagram of the overall structure of an intelligent control system for controlling a free-field small-scale acoustic holographic measurement and inversion device of the present invention;

FIG26 is a block diagram of the internal structure of an intelligent control system for controlling a free-field small-scale acoustic holographic measurement and inversion device of the present invention;

27 is a schematic diagram of the internal structure of a sound pressure test and acoustic inversion calculation module of an intelligent control system for controlling a free-field small-scale acoustic holographic measurement and inversion device of the present invention;

Figure 28 is a block diagram of the internal structure of the information input and display module of the intelligent control system that controls a free-field small-scale acoustic holographic measurement and inversion device of the present invention.

Main component number description: 1-adjustment support I, 2-adjustment support II, 3-adjustment support III, 4-base plate, 5-fixed counterweight round table, 6-horizontal position sensor K1, 7-horizontal position sensor K2, 8-vertical support rod, 9-electrical box, 10-micro LCD touch screen, 11-laser receiver, 12-longitudinal and rotational motion component installation platform, 13-special-shaped gear pair I, 14-first stepper motor D1, 15-second stepper motor Machine D2, 16-longitudinal motion assembly S1, 17-longitudinal motion assembly S2, 18-vertical motion assembly S1, 19-vertical motion assembly S2, 20-microphone array main mounting arm S1, 21-microphone array main mounting arm S2, 22-microphone array sub-mounting arm, 23-microphone, 24-mechanical connection assembly, 25-microphone calibration mechanism I, 26-microphone calibration mechanism II, 27-calibration microphone S1, 28-calibration microphone S2 , 29, a bracket, 30 a vertical rod, 31 a laser transmitter, 32 a microphone socket, 1601 a frame G1, 1602 a bearing S1, 1603 a gear pair II, 1604 a third stepping motor D3, 1605 a thread rod I, 1606 a thread rod sleeve I, 1607 a bearing S2, 1608 a slide I, 1609 a slide II, 1701 a frame G2, 1702 a bearing S3, 1703 a gear pair III, 1704-the fourth stepper motor D4, 1705-a thread rod II, 1706-a thread rod sleeve II, 1707-a bearing S4, 1708-a slide III, 1709-a slide IV, 1801-a frame G3, 1802-a bearing S5, 1803-a gear pair IV, 1804-a fifth stepper motor D5, 1805-a thread rod III, 1806-a thread rod sleeve III, 1807-a bearing S6, 1808-a slide V, 1809- Slideway VI, 1901-frame G4, 1902-bearing S7, 1903-gear pair V, 1904-sixth stepper motor D6, 1905-screw IV, 1906-screw sleeve IV, 1907-bearing S8, 1908-slideway VII, 1909-slideway VIII, 101-adjusting support I base, 102-first screw motor M1, 201-adjusting support II base, 202-second screw motor M2, 301- Adjust support III base, 302-third screw motor M3, 2001-base T1, 2002-bearing S9, 2003-seventh stepper motor D7, 2004-gear W1, 2005-bearing S10, 2006-notch I, 2007-gear rod I, 2101-base T2, 2102-bearing S11, 2103-eighth stepper motor D8, 2104-gear W2, 2105-bearing S12, 2106- Notch II, 2107-gear rod II, 2201-rack, 2202-mounting arm base, 2203-microphone insertion base, 2501-ninth stepper motor D9, 2502-sleeve I, 2503-microphone insertion port I, 2504-micro muffler I, 2505-reciprocal acoustic transducer G1, 2506-spring I, 2507-connecting piece L1, 2508-reciprocal acoustic transducer G2, 2509-electromagnet P1, 2 510 a double slide C1, 2511 an electromagnetic coil B1, 2601 a tenth stepper motor 010, 2602 a sleeve II, 2603 a microphone insertion port II, 2604 a micro muffler II, 2605 a reciprocal acoustic transducer G3, 2606 a spring II, 2607 a connecting piece L2, 2608 a reciprocal acoustic transducer G4, 2609 an electromagnet P2, 2610 a double slide C2, 2611 an electromagnetic coil B2

DETAILED DESCRIPTION

As shown in Figures 1 to 24, the present invention is a free-field small-scale acoustic holographic measurement and inversion device, which includes a whole device support adjustment mechanism I, a microphone array longitudinal motion control mechanism II, a microphone array rotational motion control mechanism III, a microphone array vertical motion control mechanism IV, a microphone array lateral motion control mechanism V, a microphone correction control mechanism VI, and a virtual ball setting reference position positioning measurement column VII; the whole device support adjustment mechanism I includes an adjustment support I1, an adjustment support II 2, and an adjustment support III 3. The three adjustment supports are connected to the screw holes on the base plate 4 through their own screw motors. The base plate 4 is provided with a fixed counterweight round table 5, which is fixed on the base plate 4. The fixed counterweight round table 4 can increase the weight of the base to prevent the entire mechanism from tipping over. The base plate 4 is also provided with a horizontal position sensor K1 and a horizontal position sensor K2. These two horizontal position sensors can detect the horizontality of the base plate 4 in two directions. Combined with the adjustment supports I, II, and III, the horizontality of the base plate 4 can be adjusted. The upper surface of the fixed counterweight round table 5 is connected to the vertical support rod 8. The upper end of the vertical support rod 8 is installed with the longitudinal and rotational motion components. The vertical support rod 8 is connected to the platform 12, and a laser receiver 11 is also provided at the upper end of the vertical support rod 8. An electrical box 9 and a micro-LCD touch screen 10 are provided on the side of the longitudinal and rotational motion component installation platform 12. A circuit board related to the control system is installed in the electrical box 9. The micro-LCD touch screen 10 can complete the input of some preset data and the display of test calculation results; the microphone array rotational motion control mechanism III includes a first stepper motor D1 and a second stepper motor D2 arranged under the longitudinal and rotational motion component installation platform 12. The first stepper motor D1 is connected to the longitudinal and rotational motion component installation platform 12 through a bearing and a special-shaped gear pair I arranged on the longitudinal and rotational motion component installation platform 12. 13 is connected to one of the gears of the special-shaped gear pair I 13, the second stepper motor D2 is connected to the other gear of the special-shaped gear pair I 13 through a bearing, the special-shaped gear pair I 13 is respectively connected to the longitudinal motion component S1 and the longitudinal motion component S2 of the longitudinal motion control mechanism II through a mechanical connection component 24 arranged on the longitudinal and rotational motion component mounting platform 12, and the forward and reverse motion of the first stepper motor D1 and the second stepper motor D2 drives the forward and reverse rotation of the special-shaped gear pair I 13, and the rotation of the longitudinal motion component S1 and the longitudinal motion component S2 is driven through the transmission of the special-shaped gear pair I 13, thereby driving the rotation of the microphone array; the microphone array longitudinal motion control mechanism II includes a longitudinal motion component S1 and a longitudinal motion component S2, which are respectively connected to the special-shaped gear pair I 13 through a mechanical connection component 24, the longitudinal motion component S1 is also connected to the frame G3 of the vertical motion component S1 through its screw sleeve I 1606, and the longitudinal motion component S2 is also connected to the frame G3 of the vertical motion component S1 through its screw sleeve II 1706 is connected to the frame G4 of the vertical motion component S2; the microphone array vertical motion control mechanism IV includes a vertical motion component S1 and a vertical motion component S2, the vertical motion component S1 is connected to the base T2 of the microphone array main mounting arm S2 of the microphone array lateral motion control mechanism V through its screw sleeve III 1806, and the vertical motion component S2 is connected to the base T1 2001 of the microphone array main mounting arm S1 20 of the microphone array lateral motion control mechanism V through its screw sleeve IV 1906; the microphone array lateral motion control mechanism V includes a microphone array main mounting arm S1 20, a microphone array main mounting arm S2 21, a plurality of microphone array sub-mounting arms 22, and a plurality of microphones 23, and the microphone array sub-mounting arms 22 are respectively mounted on the microphone array main mounting arm S1 20, the microphone array main mounting arm S2 21, the microphone 23 is mounted on the microphone array sub-mounting arm 22; the microphone correction control mechanism VI includes a microphone correction mechanism I 25 and a microphone correction mechanism II 26, and the microphone correction mechanism I 25 and the microphone correction mechanism II 26 are respectively fixed on the vertical motion component S2 19 and the vertical motion component S1 18; the adjustment support I 1 includes a first screw motor M1 102 and a base I 101, and the first screw motor M1 102 is installed in the base I 101, the adjustment support II 2 includes a second screw motor M2 202 and a base II 201, and the second screw motor M2 202 is installed in the base II 201, and the adjustment support III 3 includes a third screw motor M3 302 and a base III 301, and the third screw motor M3 302 is installed in the base III In 301 , the horizontality of the base plate 4 can be adjusted through the forward and reverse movements of the first screw motor M1 , the second screw motor M2 , and the third screw motor M3 .

The longitudinal motion component S1 16 comprises a frame G1 1601, a bearing S1 1602, a screw rod I 1605, a screw rod sleeve I 1606, a bearing S2 1607, a gear pair II 1603, and a third stepping motor D3 1604. The inner surface of one of the two longitudinal plates of the frame G1 1601 is provided with a slide groove II 1609, and the inner surface of the other plate is provided with a slide groove I 1608. The bearing S2 1607 is fixed on one of the two transverse plates of the frame G1 1601, and the bearing S2 1607 is connected to one end of the screw rod I 1605. The bearing S1 1602 is fixed on the other transverse plate of the frame G1 1601, and the bearing S1 1602 is connected to the other end of the screw rod I 1605, and the screw rod I 1605 passes through the bearing S1 1602 and the gear pair II 1603, one of the gears in the gear pair II 1603 is connected to the third stepping motor D3 1604, the screw sleeve I 1606 is sleeved on the screw I 1605, and the transverse rods of the screw sleeve I 1605 are respectively placed on the slide groove I 1608 and the slide groove II 1609. Through the positive and reverse rotation of the third stepping motor D3 1604 and the transmission of the gear pair II 1603, the screw I 1605 is driven to rotate, and then the screw sleeve I 1606 is driven to slide on the slide groove I 1608 and the slide groove II 1609, thereby driving the vertical motion component S1 18 to move longitudinally, and then driving the microphone array of the microphone array main mounting arm S2 21 to move longitudinally; the longitudinal motion component S2 17 includes a frame G2 1701, a bearing S3 1702, a screw II 1705, a screw sleeve II 1706, bearing S4 1707, gear pair III 1703, fourth stepping motor D4 1704, one of the two longitudinal plates of the frame G2 1701 is provided with a slide groove IV 1709 on its inner surface, and the other plate is provided with a slide groove III 1708 on its inner surface, bearing S4 1707 is fixed on one of the two transverse plates of the frame G2 1701, bearing S4 1707 is connected to one end of screw rod II 1705, bearing S3 1702 is fixed on the other transverse plate of the frame G2 1701, bearing S3 1702 is connected to the other end of screw rod II 1705, and screw rod II 1705 passes through bearing S3 1702 and is connected to one of the gears of gear pair III 1703, another gear in gear pair III 1703 is connected to the fourth stepping motor D4 1704, and screw rod sleeve II 1706 is sleeved on screw rod II 1705, the transverse rods of the screw sleeve II 1705 are respectively placed on the slide slot III 1708 and the slide slot IV 1709, and the screw rod II 1705 is driven to rotate through the forward and reverse rotation of the fourth stepping motor D4 1704 and then through the transmission of the gear pair II 1703, and then the screw sleeve II 1706 is driven to slide in the slide slot III 1708 and the slide slot IV 1709, thereby driving the vertical motion component S119 to move longitudinally, and then driving the microphone array on the microphone array main mounting arm S120 to move longitudinally; the vertical motion component S118 includes a frame G3 1801, a bearing S5 1802, a screw rod III 1805, a screw sleeve III 1806, a bearing S6 1807, a gear pair IV 1803, a fifth stepping motor D5 1804, and a frame G3 A slide groove VI 1809 is provided on the inner surface of one of the two longitudinal plates of the frame G3 1801, and a slide groove V 1808 is provided on the inner surface of the other plate. A bearing S6 1807 is fixed on one of the two transverse plates of the frame G3 1801, and the bearing S6 1807 is connected to one end of the screw rod III 1805. A bearing S5 1802 is fixed to the other transverse plate of the frame G3 1801, and the bearing S5 1802 is connected to the other end of the screw rod III 1805, and the screw rod III 1805 passes through the bearing S5 1802 and is connected to one of the gears of the gear pair IV 1803, and the other gear in the gear pair IV 1803 is connected to the fifth stepping motor D5 1804. The screw rod sleeve III 1806 is sleeved on the screw rod III 1805, and the transverse rods of the screw rod sleeve III 1805 are respectively placed in the slide groove V 1808 and the slide groove VI 1809, the fifth stepper motor D5 1804 rotates forward and reversely, and then drives the screw III 1805 to rotate through the transmission of the gear pair IV 1803, and then drives the screw sleeve III 1806 to slide on the slide slot V 1808 and the slide slot VI 1809, so that the microphone array on the microphone array main mounting arm S2 21 moves longitudinally; the vertical motion component S219 includes a frame G4 1901, a bearing S7 1902, a screw IV 1905, a screw sleeve IV 1906, a bearing S8 1907, a gear pair V1903, and a sixth stepper motor D6 1904. The inner surface of one of the two longitudinal plates of the frame G4 1901 is provided with a slide slot VIII 1909, and the inner surface of the other plate is provided with a slide slot VII 1908. The bearing S8 1907 is fixed to the frame G4 On one of the two horizontal plates of 1901, bearing S8 1907 is connected to one end of screw rod IV 1905, and bearing S7 1902 is fixed on the other horizontal plate of frame G4 1901. Bearing S7 1902 is connected to the other end of screw rod IV 1905, and screw rod IV 1905 passes through bearing S7 1902 and is connected to one of the gears of gear pair V 1903. The other gear in gear pair V 1903 is connected to the sixth stepping motor D6 1904. Screw rod sleeve IV 1906 is sleeved on screw rod IV 1905. The horizontal rods of screw rod sleeve IV 1905 are respectively placed on slide groove VII1908 and slide groove VIII 1909. The forward and reverse rotation of the sixth stepping motor D6 1904 is transmitted by gear pair V 1903 to drive screw rod IV 1905 to rotate, thereby driving screw rod sleeve IV 1906 in slide groove VII 1908 slides on the slide slot VIII 1909, so that the microphone array on the microphone array main mounting arm S0 20 moves longitudinally;

The microphone array main mounting arm S1 (20) comprises a base body T1 2001, one end of the base body T1 2001 is provided with a bearing S10 2005, and the other end is provided with a bearing S9 2002. The base body T1 2001 is hollow in the middle and is provided with a gear rod I 2007. The two ends of the gear rod I 2007 are respectively fixed on the bearing S10 2005 and the bearing S9 2002. A stepper motor D7 2003 is provided on one side of the base body T1 2007. The stepper motor D7 2003 is fixed on the base body T1 2001. A gear W1 2004 is provided on the shaft of the seventh stepper motor D7 2003. The gear W1 2004 is meshed with the gear rod I 2007 through a notch I 2006. A plurality of opening grooves are provided on the other side of the base body T1 2001 for installing the microphone array sub-mounting arm 22. The base body T1 A calibration microphone I 27 is also provided at the upper end of 2001, which drives the gear rod I 2007 to rotate through the forward and reverse rotation of the seventh stepper motor D7 2003 and the transmission of the gear W1 2004, thereby driving the microphone array sub-mounting arm 22 to move horizontally; the microphone array main mounting arm S2 21 includes a base body T2 2101, one end of the base body T2 2101 is provided with a bearing S12 2105, and the other end is provided with a bearing S11 2102, the middle of the base body T2 2101 is hollow, and a gear rod II 2107 is installed, and the two ends of the gear rod II 2107 are respectively fixed on the bearing S12 2105 and the bearing S11 2102, and an eighth stepper motor D8 2103 is provided on one side of the base body T2 2101, and the eighth stepper motor D8 2103 is fixed on the base body T2 2101, and the eighth stepper motor D8 2103 is fixed on the base body T2 2101. A gear W2 2104 is mounted on the shaft 2103, and the gear W2 2104 meshes with the gear rod II 2107 through the notch II 2106. A plurality of opening grooves are provided on the other side of the base T2 2101 for mounting the microphone array sub-mounting arm 22. A calibration microphone II 28 is also provided on the upper end of the base T1 2101. The gear rod II 2107 is driven to rotate through the forward and reverse rotation of the eighth stepper motor D8 2103 and the transmission of the gear W2 2104, thereby driving the microphone array sub-mounting arm 22 to move laterally. The microphone array sub-mounting arm 22 comprises a base plate 2202, and racks 2201 are provided on both sides of the back side of the base plate 2202, and a plurality of microphone insertion bases 2203 are provided on the front side, and the microphones 23 are inserted into the microphone insertion bases 2203.

The microphone correction control mechanism I 25 includes a ninth stepper motor D9 2501, a sleeve I 2502, a microphone insertion port I 2503, a micro-muffler chamber I 2504, a reciprocal acoustic transducer G1 2505, a spring I 2506, a connector L1 2507, a reciprocal acoustic transducer G2 2508, an electromagnet P1 2509, a double slide groove C1 2510, and an electromagnetic coil U1 2511. The ninth stepper motor D9 2501 is fixed on the frame G4 1901 of the vertical motion component S2 19. The ninth stepper motor D9 2501 is connected to one end of the connector L1 2507 through a screw rod, and the other end of the connector L1 2507 is connected to the sleeve I 2502. A cylindrical semi-through hole is provided inside the sleeve I 2502, and a double slide groove C1 is provided in the hole. 2510 and electromagnet P1 2509, the ear rod of electromagnet P1 2509 is placed on the double slide groove C1 2510, and at the same time, an electromagnetic coil U1 2511 is provided on the electromagnet P1 2509, and the other end of the electromagnet P1 2509 is sleeved with a spring I 2506 and connected to the micro-muffler chamber I 2504, and a reciprocal acoustic transducer G1 2505 is provided at one end of the micro-muffler chamber I 2504, and a reciprocal acoustic transducer G2 2508 is provided at the other end. In addition, a microphone insertion port I 2503 is provided in the middle of the micro-muffler chamber I 2504, and the microphone correction control mechanism I 25 can be rotated 90 degrees in the forward direction or 90 degrees in the reverse direction through the ninth stepper motor D9 2501 and then transmitted through the connecting piece L1 2507, and the electromagnet P1 can be turned on and off by the electromagnetic coil U1 2511. 2509 slides in the double slide groove C1 2510, thereby driving the micro-muffler chamber I 2504 to extend and contract, so that the microphone insertion port I 2503 of the micro-muffler chamber I 2504 can be covered with the microphone 23 or leave the microphone 23; the microphone correction control mechanism II 26 includes a tenth stepper motor D10 2601, a sleeve II 2602, a microphone insertion port II 2603, a micro-muffler chamber II 2604, a reciprocal acoustic transducer G3 2605, a spring II 2606, a connector L2 2607, a reciprocal acoustic transducer G4 2608, an electromagnet P2 2609, a double slide groove C2 2610, and an electromagnetic coil U2 2611, and the tenth stepper motor D10 2601 is fixed to the frame G3 of the vertical motion component S1 18 1801, the tenth stepper motor D10 2601 is connected to one end of the connector L2 2607 through a screw rod, and the other end of the connector L2 2607 is connected to the sleeve II 2602. A cylindrical semi-through hole is provided inside the sleeve II 2602, and a double slide groove C2 2610 and an electromagnet P2 2609 are provided in the hole. The ear rod of the electromagnet P2 2609 is placed on the double slide groove C2 2610, and the electromagnet P2 2609 is provided with an electromagnetic coil U2 2611. The other end of the electromagnet P2 2609 is sleeved with a spring II 2606 and connected to the micro-muffler chamber II 2604. A reciprocal acoustic transducer G3 2605 is provided at one end of the micro-muffler chamber II 2604, and a reciprocal acoustic transducer G4 2608 is provided at the other end. In addition, a microphone insertion port II is provided in the middle of the micro-muffler chamber II 2604. 2603, through the tenth stepper motor D10 2601, and then transmitted through the connector L2 2607, the microphone correction control mechanism II 26 can be rotated 90 degrees in the forward direction or 90 degrees in the reverse direction, and the electromagnetic coil U2 2611 can be powered on and off, so that the electromagnet P22609 can slide in the double slide groove C2 2610, thereby driving the micro-muffler chamber II 2604 to extend and contract, and the microphone insertion port II 2603 of the micro-muffler chamber II 2604 can be covered with the microphone 23 or leave the microphone 23. The microphone correction control mechanism II 26 is mainly used as a backup for the microphone correction control mechanism I 25, and it will work again when the microphone correction control mechanism I 2 is broken;

The virtual ball setting reference position measurement column VI includes a bracket 29, which is connected to a vertical rod 30. A laser transmitter 31 is provided at the upper end of the vertical rod 30, and a microphone socket 32 is provided at the upper end. The reference column mainly determines the virtual ball setting reference position during acoustic inversion.

The present invention provides an intelligent control system for a small acoustic holographic measurement and inversion device in a free sound field (not the focus of the present invention, but only briefly described here) including a control center module 70 and auxiliary modules 71 respectively connected to the control center module, an interface module 72 with a host computer, an information input and display module 73, a distance measurement module 74, a sound pressure test and acoustic inversion calculation module 75, a whole device horizontal adjustment drive module 76, a microphone array vertical motion drive module 77, a microphone array rotational motion drive module 78, a microphone array lateral motion drive module 79, a microphone array longitudinal motion drive module 80, a microphone array correction motion drive module 81, a sensor signal input Module 82; its control process is: first, the system is powered on, and the control center module 70 is initialized first, and then it is judged whether the initialization is successful. If it is not successful, it is judged whether it is timed out. If it is not timed out, it continues to judge whether the initialization is successful. If it is timed out, it displays a system error. If the initialization is successful, the control center module 70 sends an initialization command to each sub-module and sends a response confirmation signal, and then judges whether all response signals are received. If not all are received, it is judged whether the initialization is timed out. If it is timed out, it displays a system error. If it is not timed out, it continues to judge whether all response signals are received. If it is received, it enters the system ready and groups out "Please enter the following parameters" K, _N1 , _N2 , _N3 , w[x], _H1 ( _x1 , _y1 , _z1 ), _H2 (x2, _y2 , _z2 ), H _{( x3} , _y3 , _z3 ), _h1 , where x is 1 to _N2 , and then enter the holographic surface shape selection sub-process. After the holographic surface shape selection sub-process is completed, enter the whole device horizontal positioning sub-process. After the whole device horizontal positioning sub-process is completed, enter the calibration data test channel multi-frequency amplitude and phase and calibration microphone multi-frequency amplitude sensitivity and phase test calculation sub-process. After the calibration data test channel multi-frequency amplitude and phase and calibration microphone multi-frequency amplitude sensitivity and phase test calculation sub-process is completed, enter the ordinary test data channel amplitude and phase and microphone array multi-frequency amplitude sensitivity and phase calculation test sub-process. After the ordinary test data channel amplitude and phase and microphone array multi-frequency amplitude sensitivity and phase calculation test sub-process is completed, enter the sound pressure test calculation sub-process. After the sound pressure test calculation sub-process is completed, enter the acoustic inversion calculation sub-process. After the acoustic inversion calculation sub-process is completed, determine whether the test inversion task is completed. If not, return to system ready. If so, the task is completed. The parameter K in this process is the holographic surface shape selection parameter, _N1 is the number of microphones to be tested, which is also the number of test channels to be tested, and N _N2 is the number of frequencies to be corrected, _N3 is the number of cycles collected for FFT operation, w[x] is the frequency value to be corrected, _H1 ( _x1 , _y1 , _z1 ) is the reference position coordinate of the virtual spherical surface, _H2 ( _x2 , _y2 , _z2 ) is the position coordinate of the holographic surface, _H3 ( _x3 , _y3 , _z3 ) is the position coordinate of the reconstructed surface, and _h1 is the initial predetermined height of the support base I.

The holographic surface shape selection sub-flow chart is shown in Figure 6. First, the selection parameter K is passed in, and then it is determined whether K is equal to 1. If so, holographic surface shape 1 is selected. If not, it is determined whether K is equal to 2. If so, holographic surface shape 2 is selected. If not, it is determined whether K is equal to 3. If so, holographic surface shape 3 is selected. If not, it is determined whether K is equal to 4. If so, holographic surface shape 4 is selected. If not, the process ends. The parameter K in this process is the holographic surface shape selection parameter.

The horizontal positioning sub-process control process of the entire device is as follows: first, the parameter _h1 is passed in to drive the first screw motor N1 to move so that the height of the support seat I is equal to the given set value _h1 , and the value of the horizontal position sensor K2 is detected, and then it is determined whether the value is greater than 0. If it is not greater than 0, the third screw rod N3 is driven to move forward to lift the support seat III, and then return to detect the value of the horizontal position sensor K2. If it is greater than 0, the third screw rod N3 is driven to move reversely, and then return to detect the value of the horizontal position sensor K2. If it is equal to 0, the value of the horizontal position sensor K1 is detected, and then it is determined whether the value is greater than 0. If it is not greater than 0, the second screw rod N2 motor is driven to rotate forward, and then return to detect the value of the horizontal position sensor K1 to lift the support seat II. If it is greater than 0, the second screw rod N2 motor is driven to rotate reversely, and then return to detect the value of the horizontal position sensor K1. If it is equal to 0, it ends. In this process, _h1 is the initial predetermined height of the support seat I.

The control process of the calibration data test channel multi-frequency amplitude and phase and calibration microphone multi-frequency amplitude sensitivity and phase test calculation sub-flow chart is as follows: firstly, input parameters _N2 , _N3 , w[x], where x ranges from 1 to _N2 , then preset the initial value of loop variables _L1 , _L2 to 1, that is, _L1 = 1, _L2 = 1, then assign values to the frequency variable w and the loop variable, that is, w = w[ _L2 ], _L2 = _L2 + 1, then enter the calibration data test channel single frequency amplitude and phase test calculation sub-flow, after the process is completed, enter the calibration microphone single frequency amplitude sensitivity and phase test calculation sub-flow, after the process is completed, save the output data of the two processes, that is:

_B1 [ _L1 ] _{[ L2} ]＝ _Aj , _β1 [L1][ _L2 ]＝ _{θj ,} B2[ _L1 ][ _L2 ]＝ _A04 , _β2 [L1][L2]＝ _θ04 , _B3 [ _L1 ][ _L2 ]＝ _An1 , β3[ _L1 ] _[ L2]＝ _{θn1 B4[l1][L2]＝A01, β4 [ L1 ] [ L2 ]} ＝ _θ01 , after data saving, determine whether _L2 is greater than _{N2 ,} if not, return to assign frequency variable w and loop variable, that is, w＝w[ _L2 ], _L2 ＝ _{L2 + 1} , if greater, _L2 ＝ _L2 +1, then determine whether _L1 is _greater than or equal to 1, if not, _L1 ＝L ₁ +1, and returns the assignment of the frequency variable w and the loop variable, that is, w=w[L ₂ ], L ₂ =L ₂ +1. If it is greater than or equal to 1, the output data B ₁ [L ₁ ][L ₂ ], β ₁ [L ₁ ][L ₂ ], B ₂ [L ₁ ][L ₂ ], β ₂ [L ₁ ][L ₂ ], B ₁ [L ₁ ][L ₂ ], β ₃ [L ₁ ][L ₂ ], B ₄ [L ₁ ][L ₂ ], β ₄ [L ₁ ][L ₂ ], where L ₁ is 1-1 and L ₂ is 1 to N ₂ , and then the task is terminated. In this process, N ₂ is the number of frequencies to be corrected, N ₃ is the number of cycles collected for FFT operation, and w[x] is the frequency value to be corrected.

，并对变量m₂进行加1再赋给m₂，然后再判断m₂是否大于N₂，如果不大于则返回对对频率变量赋值w＝w[m₂]，如果大于，则m₁＝m₁+1，然后再判断m₁是否大于N₁，如果不大于，则返回对对频率变量赋值w＝w[m₂]，如果大于则输出C₁[m₁][m₂]，δ₁[m₁][m₂]，C₂[m₁][m₂]，δ₂[m₁][m₂]，其中C₁[m₁][m₂]，δ₁[m₁][m₂]分别为m₁路待测数据测试通道在频率为w[m₂]的幅值与相位，C₂[m₁][m₂]，δ₂[m₁][m₂]为第m₁路待测传声器在频率为w[m₂]的幅值与相位，m1为1到N₁，m₂为1到N₂。The control process of the common test data test channel and microphone array multi-frequency amplitude sensitivity and phase calculation test sub-process is as follows: input parameters: N ₁ , N ₂ , N ₃ , w[x], B ₁ [L ₁ ][L ₂ ], β ₁ [L ₁ ][L ₂ ], B ₂ [L ₁ ][L ₂ ], β ₂ [L ₁ ][L ₂ ], where x ranges from 1 to N ₂ , L ₁ is 1 to 1, and L ₂ is 1 to N ₂ , then the loop variables are assigned initial values m ₁ =1, m ₂ =1, then the frequency variable is assigned w=w[m ₂ ], then the single test data test channel single frequency amplitude and phase test signal loading step process is entered, after the process is completed, the single test microphone single frequency amplitude sensitivity and phase test signal loading step process is entered, after the process is completed, the amplitude and phase of the test channel and the amplitude sensitivity and phase of the microphone are obtained, that is:

, and add 1 to the variable m ₂ and assign it to m ₂ , then determine whether m ₂ is greater than N ₂ , if not, return the value w=w[m ₂ ] assigned to the frequency variable, if greater, then m ₁ =m ₁ +1, then determine whether m ₁ is greater than N ₁ , if not, return the value w=w[m ₂ ] assigned to the frequency variable, if greater, output C ₁ [m ₁ ][m ₂ ], δ ₁ [m ₁ ][m ₂ ], C ₂ [m 1 ][m ₂ ], δ ₂ [m ₁ ][m ₂ ], where C ₁ [m ₁ ][m ₂ ], δ ₁ [m ₁ ][m ₂ ] are the amplitude and phase of the m ₁ test data channel at the frequency w[m 2 ], respectively, and C ₂ [m ₁ ][m ₂ ], δ ₂ [m ₁ ][m ₂ ] are the amplitude and phase of the m ₁ test data channel at the frequency w[m ₂ ], respectively. ] is the amplitude and phase of the _m1th microphone to be tested at the frequency w[m ₂ ], m1 is 1 to N ₁ , and m ₂ is 1 to N ₂ .

The sound pressure test calculation sub-flow chart control process is as follows: input parameters N ₁ , N ₂ , N ₃ w[x], C ₁ [m ₁ ][m ₂ ], δ ₁ [m ₁ ][m ₂ ], C ₂ [m ₁ ][m ₂ ], δ ₂ [m ₁ ][m ₂ ], where m1 is 1 to N ₁ , m ₂ is 1 to N ₂ , and x is 1 to N ₂ ; then the signal is loaded and calculated, that is, the synchronization pulse distribution sub-unit inside the main control unit 7501 gives a synchronization pulse, and the internal DDS unit is under pulse synchronization, and N ₁ data test channels respectively collect N ₃ periodic data simultaneously, and the N ₁ groups of data are calculated and corrected by the one-dimensional and two-dimensional hybrid FFT calculation sub-unit and the spectrum energy centroid method correction sub-unit in the main control unit 7501 to obtain the signal amplitude R[m ₁ ][m ₂ ] and phase ψ[m ₁ ][m _{2 ]} of the frequency w[x] ], and finally the complex sound pressure of the holographic surface at N ₁ points on the holographic surface is obtained:

其中m1为1到N₁，m₂为1到N₂，最后输出数据P[m₁][m₂]，

然后结束，P[m₁][m₂]，

为全息面上第m₁路传声器在频率为w[m₂]的幅值与相位，m₁为1到N₁，m₂为1到N₂。P[m ₁ ][m ₂ ]＝R[m ₁ ][m ₂ ]/(C ₁ [m ₁ ][m ₂ ]*C ₂ [m ₁ ][m ₂ ]),

Where m1 is 1 to N ₁ , m ₂ is 1 to N ₂ , and the final output data is P[m ₁ ][m ₂ ],

Then end, P[m ₁ ][m ₂ ],

are the amplitude and phase of the _m1th microphone on the holographic plane at the frequency w[ _m2 ], _m1 is 1 to _N1 , and _m2 is 1 to _N2 .

其中m1为1到N₁，m₂为1到N₂，把全息面复声压数据P赋给p_E(H)，然后根据等效源强理论公式

对未知源强密度函数σ(r_Q)进行双向Fourier级数展开，同时利用二维FFT及梯形公式对格林函数K(r，r_Q)进行离散化，建立声全息测量面与虚拟球等效源强声压值之间的关系距阵T_H，从而p_E(H)＝[T_H]Q，p_E(H)为全息面测量值，Q为虚拟球未知源强密度函数σ(r_Q)双向傅立叶分解后的系数，最后采用与建立T_H同样的方法建立待反演面上H⁺声压值与拟球之间传递矩阵

结合p_E(H)＝[T_H]Q与

求出

并T_H进行正则化处理得到：

上面各式中S′是振动体内某一虚拟源强分布表面，σ(r_Q)为待求的虚拟源强密度函数，K(r，r_Q)为积分核函数，即格林函数K(r，r_Q)＝g(r，r_Q)＝(1/4πR)e^ikR，r_Q虚拟球半径，r为虚拟源强到测量面或重建面的距离。The acoustic inversion calculation sub-flowchart control process is as follows: inputting the reference center coordinates H ₁ (x ₁ , y ₁ , z ₁ ) of the virtual spherical surface, the center coordinates H ₂ (x ₂ , y ₂ , z ₂ ) of the holographic measurement surface, the center coordinates H ₃ (x ₃ , y ₃ , z ₃ ) of the reconstruction surface, the number N ₄ of virtual spheres, and the complex sound pressure data P [m ₁ ] [m ₂ ] of the holographic surface H,

Where m1 is 1 to N ₁ , m ₂ is 1 to N ₂ , assign the holographic surface complex sound pressure data P to p _E (H), and then according to the equivalent source intensity theory formula

The unknown source intensity density function σ(r _Q ) is bidirectionally expanded by Fourier series, and the Green function K(r, r _Q ) is discretized by two-dimensional FFT and trapezoidal formula. The relationship matrix _TH between the acoustic holographic measurement surface and the equivalent source intensity sound pressure value of the virtual sphere is established, so that p _E (H) = [ _TH ]Q, p _E (H) is the holographic surface measurement value, and Q is the coefficient of the bidirectional Fourier decomposition of the unknown source intensity density function σ(r _Q ) of the virtual sphere. Finally, the transfer matrix between the H ⁺ sound pressure value on the inversion surface and the pseudo-sphere is established by the same method as that of establishing _TH.

Combining p _E (H) = [ _TH ] Q with

Find

And _TH is regularized to get:

In the above formulas, S′ is a virtual source intensity distribution surface in the vibrating body, σ(r _Q ) is the virtual source intensity density function to be determined, K(r, r _Q ) is the integral kernel function, that is, Green's function K(r, r _Q )＝g(r, r _Q )＝(1/4πR)e ^ikR , r _Q is the radius of the virtual sphere, and r is the distance from the virtual source intensity to the measurement surface or the reconstruction surface.

The calculation steps of the calibration data test channel single frequency amplitude and phase test are divided into a flow control process as follows: input frequency w and the number of acquisition cycles N ₃ , and the calculation steps are as follows;

(a) The synchronization pulse distribution unit inside the main control unit 7501 gives a synchronization pulse, and the internal DDS unit gives a sine wave signal s _r =A _re ^-jw under pulse synchronization, where A _r is the amplitude of the signal s _r , and w is the frequency of the signal s _r . The signal is added to the signal driving channel I 7504 through the high-speed multi-branch electronic selection switch M1 7502, and the signal is directly added to the calibration data test channel 7512 through the high-speed multi-branch electronic selection switch M2 (7505). The signal becomes:

即A₀₁＝A_rA_q1A_j θ₀₁＝θ_q1+θ_j对

同步采样N₃个整数周期信号，该信号经主控制单元7501中一、二维混合FFT计算分单元及频谱能量重心法校正分单元的计算与校正得出频率为w的信号

的幅值A₀₁及相位θ₀₁，上面各式中B_q1(jw)信号驱动通道I 7504的频率响应函数，A_q1为B_q1(jw)的幅值，θ_q1为B_q1(jw)的相位延迟角，B_j(jw)为标定数据测试通道7512的频率响应函数，A_j为B_j(jw)的幅值，θ_j为B_j(jw)相位延迟角。

That is, A ₀₁ =A _r A _q1 A _j θ ₀₁ =θ _q1 +θ _j pair

Synchronously sample N ₃ integer periodic signals, which are calculated and corrected by the one-dimensional and two-dimensional hybrid FFT calculation subunit and the spectrum energy centroid correction subunit in the main control unit 7501 to obtain a signal with a frequency of w

The amplitude A ₀₁ and phase θ ₀₁ of the above formula are the frequency response functions of the B _q1 (jw) signal driving channel I 7504, A _q1 is the amplitude of B _q1 (jw), θ _q1 is the phase of B _q1 (jw) Phase delay angle, B _j (jw) is the frequency response function of the calibration data test channel 7512, A _j is the amplitude of B _j (jw), and θ _j is the phase delay angle of B _j (jw).

即：A₀₂＝A_rA_q2A_j，θ₀₂＝θ_q2+θ_j，对

同步采样N₃个整数周期信号，该信号经主控制单元7501中一、二维混合FFT计算分单元及频谱能量重心法校正分单元的计算与校正得出频率为w信号

的幅值A₀₂及相位θ₀₂，上面各式中B_q2(jw)信号驱动通道II 7503的频率响应函数为，A_q2为B_q2(jw)的幅值，θ_q2为B_q2(jw)的相位延迟角，B_j(jw)为标定数据测试通道7512的频率响应函数，A_j为B_j(jw)的幅值，θ_j为B_j(jw)相位延迟角。(b) The synchronization pulse distribution subunit inside the main control unit 7501 gives a synchronization pulse, and the internal DDS subunit gives a sine wave signal s _r =A _re ^-jw under pulse synchronization, where A _r is the amplitude of the signal s _r , and w is the frequency of the signal s _r . The signal is added to the signal drive channel II 7503 through the high-speed multi-branch electronic selection switch M1 7502, and the signal is directly added to the calibration data test channel 7512 through the high-speed multi-branch electronic selection switch M2 7505. The signal becomes:

That is: A ₀₂ =A _r A _q2 A _j , θ ₀₂ =θ _q2 +θ _j , for

Synchronously sample N ₃ integer periodic signals, which are calculated and corrected by the one-dimensional and two-dimensional hybrid FFT calculation subunit and the spectrum energy centroid correction subunit in the main control unit 7501 to obtain a signal with a frequency of w

The amplitude A ₀₂ and phase θ ₀₂ of the signal driving channel II 7503 in the above formulas are: A _q2 is the amplitude of B _q2 (jw), θ _q2 is the phase delay angle of B _q2 (jw), B _j (jw) is the frequency response function of the calibration data test channel 7512, A _j is the _amplitude of B _j (jw), and θ _j is the phase delay angle of B _j (jw).

(c) The synchronization pulse distribution subunit inside the main control unit 7501 gives a synchronization pulse, and the internal DDS subunit gives a sine wave signal s _r =A _re ^-jw under pulse synchronization, where A _r is the amplitude of the signal s _r , and w is the frequency of the signal s _r . The signal is added to the signal driving channel I 7504 through the high-speed multi-branch electronic selection switch M1 7502, and the signal is then added to the signal driving channel II 7503 through the high-speed multi-branch electronic selection switch M2 7505, and then added to the calibration data test channel 7512 through the high-speed multi-branch electronic selection switch M2 7505. The signal becomes:

同步采样N₃个整数周期信号，该信号经主控制单元7501中一、二维混合FFT计算分单元及频谱能量重心法校正分单元的计算与校正得出频率为w信号

幅值A₀₃及相位θ₀₃，上式B_q1(jw)信号驱动通道I 7504的频率响应函数，A_q1为B_q1(jw)的幅值，θ_q1为B_q1(jw)的相位延迟角，B_j(jw)为标定数据测试通道7512的频率响应函数，A_j为B_j(jw)的幅值，θ_j为B_j(jw)相位延迟角，B_q2(jw)信号驱动通道II 7503的频率响应函数为，A_q2为B_q2(jw)的幅值，θ_q2为B_q2(jw)的相位延迟角。That is: A ₀₃ =A _r A _q1 A _q2 A _j , θ ₀₃ =θ _q1 +θ _q2 +θ _j , for

Synchronously sample N ₃ integer periodic signals, which are calculated and corrected by the one-dimensional and two-dimensional hybrid FFT calculation subunit and the spectrum energy centroid correction subunit in the main control unit 7501 to obtain a signal with a frequency of w

Amplitude A ₀₃ and phase θ ₀₃ , the above formula is the frequency response function of the B _q1 (jw) signal driving channel I 7504, A _q1 is the amplitude of B _q1 (jw), θ _q1 is the phase delay angle of B _q1 (jw) , B _j (jw) is the frequency response function of the calibration data test channel 7512, A _j is the amplitude of B _j (jw), θ _j is the phase delay angle of B _j (jw), and B _q2 (jw) is the signal driving channel II The frequency response function of 7503 is, A _q2 is the amplitude of B _q2 (jw), θ _q2 is the phase delay angle of B _q2 (jw).

(d) From A ₀₁ , A ₀₂ , A ₀₃ , and A _r , we can obtain A _q1 , A _q2 , and A _j . From θ ₀₁ , θ ₀₂ , and θ _{03 ,} we can obtain θ _q1 , θ _q2 , and θ _{j .} That is:

A _q1 =A ₀₃ /A ₀₂ , A _q2 =A ₀₃ /A ₀₁ , A _j =(A ₀₁ A ₀₂ )/(A _r A ₀₃ ),

θ _q1 =θ ₀₃ -θ ₀₂ , θ _q2 =θ ₀₃ -θ ₀₁ , θ _j =θ ₀₁ +θ ₀₂ -θ ₀₃ ,

The final outputs are A ₀₁ , A ₀₂ , A ₀₃ , A ₀₄ , θ ₀₁ , θ ₀₂ , θ ₀₃ , θ _j , and N3.

The calculation steps of the single frequency amplitude sensitivity and phase test of the calibration microphone are divided into a flow control process as follows: firstly, the parameters w, A ₀₁ , A ₀₂ , A ₀₃ , θ ₀₁ , θ ₀₂ , θ ₀₃ , N ₃ are input, and the calculation steps are as follows:

(g1) The microphone correction mechanism I 25, in cooperation with the microphone array vertical motion control mechanism IV and the microphone array lateral motion control mechanism V, inserts the microphone insertion port I 2503 of the microphone correction mechanism I 25 into the calibration microphone 27. At the same time, the synchronization pulse distribution unit inside the main control unit 7501 gives a synchronization pulse, and the internal DDS subunit gives a sinusoidal wave signal s _r =A _r e ^-jw under pulse synchronization, wherein A _r is the amplitude of the signal s _r , and w is the frequency of the signal s _r . The signal is added to the signal driving channel I 7504 through the high-speed multi-branch electronic selection switch M1 7502, and then added to the reciprocal acoustic transducer G1 2505 through the high-speed multi-branch electronic selection switch M2 7505, so as to drive the reciprocal acoustic transducer G1 2505 to emit sound and radiate sound waves. The sound waves are coupled to the reciprocal acoustic transducer G1 2505. The signal is received by the calibration microphone 27 at a distance of r/2 from 2502. The signal is added to the calibration data test channel 7512 through the high-speed multi-branch electronic selection switch M3 7509, and the signal becomes:

同步采样N₃个整数周期信号，该信号经主控制单元7501中一、二维混合FFF计算分单元及频谱能量重心法校正分单元的计算与校正得出频率为w的信号

幅值A₀₄及相位θ₀₄，上式B_q1(jw)信号驱动通道I 7504的频率响应函数，A_q1为B_q1(jw)的幅值，θ_q1为B_q1(jw)的相位延迟角，B_j(jw)为标定数据测试通道7512的频率响应函数，A_j为B_j(jw)的幅值，θ_j为B_j(jw)相位延迟角，B_q2(jw)信号驱动通道II7503的频率响应函数为，A_q2为B_q2(jw)的幅值，θ_q2为B_q2(jw)的相位延迟角，B_tr1(jw)为互易声学换能G1 2505发射频率响应函数，A_tr1为B_tr1(jw)的幅值，θ_tr1为B_tr1(jw)相位延迟角，B_n1(w)为标定传声器(27)接收频率响应函数，A_n1为B_n1(w)的幅值，θ_n1为为B_n1(w)的相位延迟角。That is: A ₀₄ =A _r A _q1 A _r1 A _n1 A _j ,θ ₀₄ =θ _q1 +θ _tr1 +θ _n1 +θ _j , right

Synchronously sample N ₃ integer periodic signals, which are calculated and corrected by the one-dimensional and two-dimensional mixed FFF calculation subunit and the spectrum energy centroid correction subunit in the main control unit 7501 to obtain a signal with a frequency of w

Amplitude A ₀₄ and phase θ ₀₄ , the above formula is the frequency response function of the B _q1 (jw) signal driving channel I 7504, A _q1 is the amplitude of B _q1 (jw), θ _q1 is the phase delay angle of B _q1 (jw) , B _j (jw) is the frequency response function of the calibration data test channel 7512, A _j is the amplitude of B _j (jw), θ _j is the phase delay angle of B _j (jw), and B _q2 (jw) is the signal driving channel II7503 The frequency response function is: A _q2 is the amplitude of B _q2 (jw), θ _q2 is the phase delay angle of B _q2 (jw), B _tr1 (jw) is the reciprocal acoustic transducer G1 2505 transmission frequency response function, A _tr1 is the amplitude of B _tr1 (jw), θ _tr1 is the phase delay angle of B _tr1 (jw), B _n1 (w) is the receiving frequency response function of the calibration microphone (27), A _n1 is the amplitude of B _n1 (w), and θ _n1 is the phase delay angle of B _n1 (w).

(g2) The microphone correction mechanism I 25, in cooperation with the microphone array vertical motion control mechanism IV and the microphone array lateral motion control mechanism V, inserts the microphone insertion port I 2503 of the microphone correction mechanism I 25 into the calibration microphone 27. At the same time, the synchronization pulse distribution unit inside the main control unit 7501 gives a synchronization pulse, and the internal DDS subunit gives a sinusoidal wave signal s _r =A _r e ^-jw under pulse synchronization, wherein A _r is the amplitude of the signal s _r , and w is the frequency of the signal s _r . The signal is added to the signal driving channel II 7503 via the high-speed multi-branch electronic selection switch M1 7502. The signal is added to the reciprocal acoustic transducer G2 2508 via the high-speed multi-branch electronic switch M2 7505, thereby driving the reciprocal acoustic transducer G2 2508 to emit sound and radiate sound waves. The sound waves are coupled to the reciprocal acoustic transducer G2 2508. The signal is received by the calibration microphone 27 with a distance of r/2 from 2508. The signal is added to the calibration data test channel 7512 through the high-speed multi-branch electronic selection switch M37509, and the signal becomes:

同步采样N₃个整数周期信号，该信号经主控制单元7501中一、二维混合FFT计算分单元及频谱能量重心法校正分单元的计算与校正得出频率为w的信号

的幅值A₀₅及相位θ₀₅，上式B_q2(jw)信号驱动通道II 7503的频率响应函数，A_q2为B_q2(jw)的幅值，θ_q2为B_q2(jw)的相位延迟角，B_j(jw)为标定数据测试通道7512的频率响应函数，A_j为B_j(jw)的幅值，θ_j为B_j(jw)相位延迟角，B_tr2(jw)为互易声学换能G2 2508发射频率响应函数，A_tr2为B_tr2(jw)的幅值，θ_tr2为B_tr2(jw)相位延迟角，B_n1(w)为标定传声器27接收频率响应函数，A_n1为B_n1(w)的幅值，θ_n1为为B_n1(w)的相位延迟角。That is: A ₀₅ ＝A _r A _q2 A _tr2 A _n1 A _j , θ ₀₅ ＝θ _q2 +θ _tr2 +θ _n1 +θ _j , right

Synchronously sample N ₃ integer periodic signals, which are calculated and corrected by the one-dimensional and two-dimensional hybrid FFT calculation subunit and the spectrum energy centroid correction subunit in the main control unit 7501 to obtain a signal with a frequency of w

The amplitude A ₀₅ and phase θ ₀₅ of the above formula are the frequency response function of the B _q2 (jw) signal driving channel II 7503, A _q2 is the amplitude of B _q2 (jw), θ _q2 is the phase delay of B _q2 (jw) angle, B _j (jw) is the frequency response function of the calibration data test channel 7512, A _j is the amplitude of B _j (jw), θ _j is the phase delay angle of B _j (jw), and B _tr2 (jw) is the reciprocal The acoustic transducer G2 2508 transmits the frequency response function, A _tr2 is the amplitude of B _tr2 (jw), θ _tr2 is the phase delay angle of B _tr2 (jw), B _n1 (w) is the receiving frequency response function of the calibration microphone 27, and A _n1 is the amplitude of B _n1 (w), θ _n1 is the phase delay angle of B _n1 (w).

(g3) The synchronization pulse distribution subunit inside the main control unit 7501 gives a synchronization pulse, and the internal DDS subunit gives a sine wave signal s _r =A _r e ^-jw under pulse synchronization, where A _r is the amplitude of the signal s _r , and w is the frequency of the signal s _r . The signal passes through the high-speed multi-branch electronic selection switch M1 7502 and is added to the signal driving channel I 7504. The signal passes through the high-speed multi-branch electronic selection switch M2 7505 and is added to the reciprocal acoustic transducer G1 2505, driving the reciprocal acoustic transducer G1 2505 to sound and radiate sound waves. The sound waves are received by the reciprocal acoustic transducer G2 2508 which is r away from the reciprocal acoustic transducer G1 2505. The signal passes through the high-speed multi-branch electronic selection switch M3 7509 and is added to the data test channel. The signal becomes:

同步采样N₃个整数周期信号，该信号经主控制单元7501中一、二维混合FFT计算分单元及频谱能量重心法校正分单元的计算与校正得出频率为w的信号

幅值A₀₆及相位θ₀₆，上式B_q1(jw)信号驱动通道I 7504的频率响应函数，A_q1为B_q1(jw)的幅值，θ_q1为B_q1(jw)的相位延迟角，B_j(jw)为标定数据测试通道7512的频率响应函数，A_j为B_j(jw)的幅值，θ_j为B_j(jw)相位延迟角，B_tr1(jw)为互易声学换能G1 2505发射频率响应函数，A_tr1为B_tr1(jw)的幅值，θ_tr1为B_tr1(jw)相位延迟角，B_tr2(jw)为互易声学换能G2(2508)发射频率响应函数，A_tr2为B_tr2(jw)的幅值，θ_tr2为B_tr2(jw)相位延迟角，B′_tr2(jw)为互易声学换能G2(2508)接收频率响应函数，ρ₀为空气密度，f为声波的频率，2r/ρ₀f为球面自由声场的互易参量，对于其他自由声场这个参数要适当修正，同样可以适用用其他类型的自由声场来做为测试声源。That is: A ₀₆ ＝A _r A _q1 A _tr1 A _tr2 [2r/(ρf)]A _j , θ ₀₆ ＝θ _q1 +θ _tr1 +θ _tr2 -kr+π/2+θ _j , right

Synchronously sample N ₃ integer periodic signals, which are calculated and corrected by the one-dimensional and two-dimensional hybrid FFT calculation subunit and the spectrum energy centroid correction subunit in the main control unit 7501 to obtain a signal with a frequency of w

Amplitude A ₀₆ and phase θ ₀₆ , the above formula is the frequency response function of the B _q1 (jw) signal driving channel I 7504, A _q1 is the amplitude of B _q1 (jw), θ _q1 is the phase delay angle of B _q1 (jw) , B _j (jw) is the frequency response function of the calibration data test channel 7512, A _j is the amplitude of B _j (jw), θ _j is the phase delay angle of B _j (jw), B _tr1 (jw) is the reciprocal acoustic Transducer G1 2505 transmit frequency response function, A _tr1 is the amplitude of B _tr1 (jw), θ _tr1 is the phase delay angle of B _tr1 (jw), and B _tr2 (jw) is the transmit frequency of the reciprocal acoustic transducer G2 (2508) Response function, A _tr2 is the amplitude of B _tr2 (jw), θ _tr2 is the phase delay angle of B _tr2 (jw), B′ _tr2 (jw) is the receiving frequency response function of the reciprocal acoustic transducer G2 (2508), ρ ₀ is the air density, f is the frequency of the sound wave, 2r/ρ ₀ f is the reciprocal parameter of the spherical free sound field, and for other free sound fields, The parameters need to be modified appropriately, and other types of free sound fields can also be used as test sound sources.

(g4) Find A _tr1 , A _tr2 , A _n1 from A ₀₁ , A ₀₂ , A ₀₃ , A ₀₄ , A ₀₅ , A ₀₆ , A _r :

由θ₀₁，θ₀₂，θ₀₃，θ₀₄，θ₀₅，θ₀₆求出θ_tr1，θ_tr2，θ_n1：

θ_n1＝(θ₀₁+θ₀₄+θ₀₅-θ₀₃-θ₀₆-θ_j+k-π/2)/2，所求得的A_n1、θ_n1就是待测传声器的幅值灵敏度与相位校正系数，输出A_n1，θ_n1A₀₄，θ₀₄。

Find θ _tr1 , θ _tr2 , θ _n1 from θ ₀₁ , θ ₀₂ , θ ₀₃ , θ ₀₄ , θ ₀₅ , θ ₀₆ :

θ _n1 =(θ ₀₁ +θ ₀₄ +θ ₀₅ -θ ₀₃ -θ ₀₆ -θ _j +k-π/2)/2. The obtained A _n1 and θ _n1 are the amplitude sensitivity and phase of the microphone to be tested. Correction coefficient, output A _n1 , θ _n1 A ₀₄ , θ ₀₄ .

The control process of the loading step of the single frequency amplitude and phase test signal of the single data test channel to be tested is as follows: the parameter _N3 is input, and then the signal loading calculation is performed, that is, the synchronization pulse distribution sub-unit inside the main control unit 7501 gives a synchronization pulse, and the internal DDS unit gives a sine wave signal _sr = _Are - ^jw under pulse synchronization, wherein _Ar is the amplitude of the signal _sr , and w is the frequency of the signal _sr . The signal is added to the signal driving channel I 7504 through the high-speed multi-branch electronic selection switch M1 (7502), and the signal is then directly added to the _m1 -th data test channel 7511 through the high-speed multi-branch electronic selection switch M2 7505, and the signal becomes:

即：

对

同步采样N₃个整数周期信号，该信号经主控制单元7501中一、二维混合FFT计算分单元及频谱能量重心法校正分单元的计算与校正得出频率为w的信号

幅值

及相位

最后输出幅值

及相位

Right now:

right

Synchronously sample N ₃ integer periodic signals, which are calculated and corrected by the one-dimensional and two-dimensional hybrid FFT calculation subunit and the spectrum energy centroid correction subunit in the main control unit 7501 to obtain a signal with a frequency of w

Amplitude

and Phase

Final output amplitude

and Phase

The control process of the single frequency amplitude sensitivity and phase test number loading step of the single microphone to be tested is as follows: input parameter _N3 , and then perform signal loading calculation, that is: the microphone correction mechanism I25, under the cooperation of the microphone array vertical motion control mechanism IV and the microphone array lateral motion control mechanism V, makes the microphone insertion port I2503 of the microphone correction mechanism I25 insert the _m1- th microphone, and at the same time, the synchronization pulse distribution unit inside the main control unit 7501 gives a synchronization pulse, and the internal DDS unit gives a sine wave signal _sr = _Are - ^jw under pulse synchronization, wherein _Ar is the amplitude of the signal _sr , and w is the frequency of the signal _sr . The signal is added to the signal driving channel I7504 through the high-speed multi-branch electronic selection switch M17502, and then added to the reciprocal acoustic transducer G12505 through the high-speed multi-branch electronic selection switch M27505, so as to drive the reciprocal acoustic transducer G12505. 2505 emits sound and radiates sound waves, which are received by the _m1 -th microphone which is r/2 away from the reciprocal acoustic transducer G1 2505. The signal is added to the _m1- th data test channel 7511 through the high-speed multi-branch electronic selection switch M3 7509, and the signal becomes:

You will get:

幅值

及相位

输出幅值

及相位

The signal of N ₃ integer periodic signals is synchronously sampled at s, and the signal with frequency w is obtained by the one-dimensional and two-dimensional hybrid FFT calculation and the spectrum energy centroid method correction unit in the main control unit 7501.

Amplitude

and Phase

Output amplitude

and Phase

Δw对频率校正，

对幅值进行校正，其中

M一般取1或2，X_k为快速傅里叶变换中频谱图中k位置的复值谱，K_t为能量恢系数，K_t的取一般与窗函数的选取有关，用Hanning窗时一般取8/3。The energy centroid method spectrum correction method is:

Δw for frequency correction,

The amplitude is corrected, where

M is generally 1 or 2, _Xk is the complex spectrum at position k in the spectrum diagram in the fast Fourier transform, _Kt is the energy recovery coefficient, and _Kt is generally related to the selection of the window function. When using the Hanning window, it is generally 8/3.

Claims (4)

1. A free-field small-scale acoustic holographic measurement and inversion device, characterized in that the device comprises a whole device support adjustment mechanism I, a microphone array longitudinal motion control mechanism II, a microphone array rotational motion control mechanism III, a microphone array vertical motion control mechanism IV, a microphone array lateral motion control mechanism V, a microphone correction control mechanism VI, and a virtual ball setting reference position positioning measurement column VII; the whole device support adjustment mechanism I comprises an adjustment support I (1), an adjustment support II (2), and an adjustment support III (3), and the three adjustment supports are respectively connected by respective wires. The rod motor is connected to the screw hole on the base plate (4), and a fixed counterweight round table (5) is provided on the base plate (4). The fixed counterweight round table (5) is fixed on the base plate (4). The base plate (4) is also provided with a horizontal position sensor K1 (6) and a horizontal position sensor K2 (7). The upper surface of the fixed counterweight round table (5) is connected to a vertical support rod (8), and the upper end of the vertical support rod (8) is connected to a longitudinal and rotational motion component installation platform (12). A laser receiver (11) is also provided at the upper end of the vertical support rod (8), and an electrical box (9) is provided on the side of the longitudinal and rotational motion component installation platform (12). and a micro liquid crystal display touch screen (10); the microphone array rotation motion control mechanism III comprises a first stepper motor D1 (14) and a second stepper motor D2 (15) arranged below the longitudinal and rotation motion component mounting platform (12); the first stepper motor D1 (14) is connected to one of the gears of the special-shaped gear pair I (13) arranged on the longitudinal and rotation motion component mounting platform (12) through a bearing; the second stepper motor D2 (15) is connected to another gear of the special-shaped gear pair I (13) through a bearing; the special-shaped gear pair I (13) is connected to the longitudinal and rotation motion component mounting platform (12) through a bearing. The mechanical connection assembly (24) of the moving assembly mounting platform (12) is respectively connected to the longitudinal movement assembly S1 (16) and the longitudinal movement assembly S2 (17) of the longitudinal movement control mechanism II; the microphone array longitudinal movement control mechanism II includes the longitudinal movement assembly S1 (16) and the longitudinal movement assembly S2 (17), which are respectively connected to the special-shaped gear pair I (13) through the mechanical connection assembly (24), and the longitudinal movement assembly S1 (16) is also connected to the frame G3 (1801) of the vertical movement assembly S1 (18) through its screw sleeve I (1606). The moving assembly S2 (17) is also connected to the frame G4 (1901) of the vertical moving assembly S2 (19) through its screw sleeve II (1706); the microphone array vertical motion control mechanism IV includes a vertical moving assembly S1 (18) and a vertical moving assembly S2 (19); the vertical moving assembly S1 (18) is connected to the base T2 (2101) of the microphone array main mounting arm S2 (21) of the microphone array lateral motion control mechanism V through its screw sleeve III (1806); the vertical moving assembly S2 (19) is connected to the base T2 (2101) of the microphone array main mounting arm S2 (21) of the microphone array lateral motion control mechanism V through its screw sleeve IV (1906). The microphone array lateral motion control mechanism V is connected to a base body T1 (201) of a microphone array main mounting arm S1 (20); the microphone array lateral motion control mechanism V comprises a microphone array main mounting arm S1 (20), a microphone array main mounting arm S2 (21), a plurality of microphone array sub-mounting arms (22), and a plurality of microphones (23); the microphone array sub-mounting arms (22) are respectively mounted on the microphone array main mounting arm S1 (20) and the microphone array main mounting arm S2 (21); the microphones (23) are mounted on the microphone array sub-mounting arms (22). ; The microphone correction control mechanism VI includes a microphone correction mechanism I (25) and a microphone correction mechanism II (26), and the microphone correction mechanism I (25) and the microphone correction mechanism II (26) are respectively fixed on the vertical motion component S2 (19) and the vertical motion component S1 (18); the adjustment support I (1) includes a screw motor M1 (102) and a base I (101), and the screw motor M1 (102) is installed in the base I (101); the adjustment support II (2) includes a screw motor M2 (202), a base II (201), and the screw motor M2 (202) is installed in the base II (201), the adjustment support III (3) includes a screw motor M3 (302) and a base III (301), and the screw motor M3 (302) is installed in the base III (301); the longitudinal motion component S1 (16) includes a frame G1 (1601), a bearing S1 (1602), a screw I (1605), a screw sleeve I (1606), a bearing S2 (1607), a gear pair II (1603), and a third stepping motor D3 (1604), and the frame G1 (1601) has one of the two longitudinal plates. A slide groove II (1609) is provided on the surface, and a slide groove I (1608) is provided on the inner surface of the other plate. The bearing S2 (1607) is fixed on one of the two horizontal plates of the frame G1 (1601). The bearing S2 (1607) is connected to one end of the screw rod I (1605). A bearing S1 (1602) is fixed on the other horizontal plate of the frame G1 (1601). The bearing S1 (1602) is connected to the other end of the screw rod I (1605), and the screw rod I (1605) passes through the bearing S1 (1602) and is connected to one of the gears of the gear pair II (1603). The gear pair Another gear in II (1603) is connected to the third stepping motor D3 (1604), the screw sleeve I (1606) is sleeved on the screw I (1605), and the transverse rods of the screw sleeve I (1605) are respectively placed on the slide groove I (1608) and the slide groove II (1609); the longitudinal motion component S2 (17) includes a frame G2 (1701), a bearing S3 (1702), a screw II (1705), a screw sleeve II (1706), a bearing S4 (1707), a gear pair III (1703), a fourth stepping motor D4 (1704), and a machine The inner surface of one of the two longitudinal plates of the frame G2 (1701) is provided with a slide groove IV (1709), and the inner surface of the other plate is provided with a slide groove III (1708). The bearing S4 (1707) is fixed on one of the two transverse plates of the frame G2 (1701), and the bearing S4 (1707) is connected to one end of the screw rod II (1705). The other transverse plate of the frame G2 (1701) is fixed with a bearing S3 (1702), and the bearing S3 (1702) is connected to the other end of the screw rod II (1705), and the screw rod II (1705) passes through the bearing S3 (1707). 702) is connected to one of the gears of the gear pair III (1703), the other gear in the gear pair III (1703) is connected to the fourth stepping motor D4 (1704), the screw sleeve II (1706) is sleeved on the screw II (1705), and the transverse rods of the screw sleeve II (1705) are respectively placed on the slide groove III (1708) and the slide groove IV (1709); the vertical motion component S1 (18) includes a frame G3 (1801), a bearing S5 (1802), a screw III (1805), a screw sleeve III (1806), and a bearing S6 (1807), gear pair IV (1803), fifth stepping motor D5 (1804), one of the two longitudinal plates of the frame G3 (1801) has a slide groove VI (1809) on its inner surface, and the other plate has a slide groove V (1808) on its inner surface, bearing S6 (1807) is fixed on one of the two transverse plates of the frame G3 (1801), bearing S6 (1807) is connected to one end of the screw rod III (1805), the other transverse plate of the frame G3 (1801) is fixed with bearing S5 (1802), bearing S5 (1802) is connected to the screw rod The other end of the screw rod III (1805) is connected to the other end of the screw rod III (1805), and the screw rod III (1805) passes through the bearing S5 (1802) and is connected to one of the gears in the gear pair IV (1803), and the other gear in the gear pair IV (1803) is connected to the fifth stepping motor D5 (1804), the screw rod sleeve III (1806) is sleeved on the screw rod III (1805), and the transverse rods of the screw rod sleeve III (1805) are respectively placed on the slide groove V (1808) and the slide groove VI (1809); the vertical motion component S2 (19) includes a frame G4 (1901), a bearing S7 (1902), screw rod IV (1905), screw rod sleeve IV (1906), bearing S8 (1907), gear pair V (1903), sixth stepping motor D6 (1904), one of the two longitudinal plates of the frame G4 (1901) has a slide groove VIII (1909) on its inner surface, and the other has a slide groove VII (1908) on its inner surface, bearing S8 (1907) is fixed on one of the two transverse plates of the frame G4 (1901), bearing S8 (1907) is connected to one end of screw rod IV (1905), frame G4 (190 1) A bearing S7 (1902) is fixed on another horizontal plate, and the bearing S7 (1902) is connected to the other end of the screw rod IV (1905), and the screw rod IV (1905) passes through the bearing S7 (1902) and is connected to one of the gears in the gear pair V (1903), and the other gear in the gear pair V (1903) is connected to the sixth stepping motor D6 (1904), and the screw rod sleeve IV (1906) is sleeved on the screw rod IV (1905), and the horizontal rods of the screw rod sleeve IV (1905) are respectively placed on the slide groove VII (1908) and the slide groove VIII (1909). 2. A free-field small-scale acoustic holographic measurement and inversion device as described in claim 1, characterized in that the microphone array main mounting arm S1 (20) includes a base T1 (2001), one end of the base T1 (2001) is provided with a bearing S10 (2005), and the other end is provided with a bearing S9 (2002), the base T1 (2001) is hollow in the middle and is equipped with a gear rod I (2007), the two ends of the gear rod I (2007) are respectively fixed on the bearing S10 (2005) and the bearing S9 (2002), and one side of the base T1 (2007) is provided with a stepping motor D 7 (2003), a stepper motor D7 (2003) is fixed on a substrate T1 (2001), a gear W1 (2004) is mounted on the shaft of the seventh stepper motor D7 (2003), the gear W1 (2004) is meshed with a gear rod I (2007) through a notch I (2006), a plurality of opening grooves are provided on the other side of the substrate T1 (2001) for mounting a microphone array sub-mounting arm (22), and a calibration microphone I (27) is also provided on the upper end of the substrate T1 (2001); the microphone array main mounting arm S2 (21) comprises a substrate T2 (2101), a substrate T A bearing S12 (2105) is provided at one end of the base T2 (2101), and a bearing S11 (2102) is provided at the other end. The middle of the base T2 (2101) is hollow and is provided with a gear rod II (2107). The two ends of the gear rod II (2107) are respectively fixed on the bearing S12 (2105) and the bearing S11 (2102). An eighth stepper motor D8 (2103) is provided on one side of the base T2 (2101). The eighth stepper motor D8 (2103) is fixed on the base T2 (2101). A gear W2 (2107) is provided on the shaft of the eighth stepper motor D8 (2103). 4), the gear W2 (2104) is meshed with the gear rod II (2107) through the notch II (2106), the other side of the base T2 (2101) is provided with a plurality of open grooves for installing the microphone array sub-mounting arm (22), and the upper end of the base T1 (2101) is also provided with a calibration microphone II (28); the microphone array sub-mounting arm (22) comprises a base plate (2202), racks (2201) are provided on both sides of the back of the base plate (2202), and a plurality of microphone insertion bases (2203) are provided on the front side, and the microphones (23) are inserted into the microphone insertion bases (2203). 3. A free-field small-scale acoustic holography, measurement and inversion device as described in claim 1, characterized in that the microphone correction control mechanism I (25) includes a ninth stepper motor D9 (2501), a sleeve I (2502), a microphone insertion port I (2503), a micro-muffler chamber I (2504), a reciprocal acoustic transducer G1 (2505), a spring I (2506), a connector L1 (2507), a reciprocal acoustic transducer G2 (2508), an electromagnet P1 (2509), a double slide groove C1 (2510), and an electromagnetic coil U1 (2511), the ninth stepper motor D9 (2501) is fixed on the frame G4 (1901) of the vertical motion component S2 (19), and the ninth stepper motor D9 (2501) is connected to the connector L1 through a screw rod. 1 (2507) is connected to one end, and the other end of the connecting piece L1 (2507) is connected to the sleeve I (2502). A cylindrical semi-through hole is provided inside the sleeve I (2502), and a double slide groove C1 (2510) and an electromagnet P1 (2509) are provided in the hole. The ear rod of the electromagnet P1 (2509) is placed on the double slide groove C1 (2510). At the same time, an electromagnetic coil U1 (2511) is provided on the electromagnet P1 (2509). The other end of the electromagnet P1 (2509) is sleeved with a spring I (2506) and is connected to the micro-muffler chamber I (2504). A reciprocal acoustic transducer G1 (2505) is provided at one end of the micro-muffler chamber I (2504), and a reciprocal acoustic transducer G2 (2508) is provided at the other end. In addition, a transducer is provided in the middle of the micro-muffler chamber I (2504). The microphone insertion port I (2503); the microphone correction control mechanism II (26) includes a tenth stepper motor D10 (2601), a sleeve II (2602), a microphone insertion port II (2603), a micro-muffler chamber II (2604), a reciprocal acoustic transducer G3 (2605), a spring II (2606), a connector L2 (2607), a reciprocal acoustic transducer G4 (2608), an electromagnet P2 (2609), a double slide groove C2 (2610), and an electromagnetic coil U2 (2611). The tenth stepper motor D10 (2601) is fixed on the frame G3 (1801) of the vertical motion component S1 (18). The tenth stepper motor D10 (2601) is connected to one end of the connector L2 (2607) through a screw rod. The connector L 2 (2607) is connected to the sleeve II (2602), and a cylindrical semi-through hole is provided inside the sleeve II (2602), and a double slide groove C2 (2610) and an electromagnet P2 (2609) are provided in the hole. The ear rod of the electromagnet P2 (2609) is placed on the double slide groove C2 (2610), and the electromagnet P2 (2609) is provided with an electromagnetic coil U2 (2611). The other end of the electromagnet P2 (2609) is sleeved with a spring II (2606) and connected to the micro-muffler chamber II (2604). A reciprocal acoustic transducer G3 (2605) is provided at one end of the micro-muffler chamber II (2604), and a reciprocal acoustic transducer G4 (2608) is provided at the other end. In addition, a microphone insertion port II (2603) is provided in the middle of the micro-muffler chamber II (2604). 4. A free-field small-scale acoustic holographic measurement and inversion device as described in claim 1, characterized in that the virtual ball setting reference position measurement column VI includes a bracket (29), the bracket (29) is connected to a vertical rod (30), a laser transmitter (31) is provided at the upper end of the vertical rod (30), and a microphone socket (32) is provided at the upper end.

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