CN109782230B - Free sound field small-sized acoustic holographic measurement and inversion device - Google Patents
Free sound field small-sized acoustic holographic measurement and inversion device Download PDFInfo
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- CN109782230B CN109782230B CN201910082823.6A CN201910082823A CN109782230B CN 109782230 B CN109782230 B CN 109782230B CN 201910082823 A CN201910082823 A CN 201910082823A CN 109782230 B CN109782230 B CN 109782230B
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Abstract
The invention discloses a small-sized acoustic holographic measurement and inversion device for a free sound field, and relates to an acoustic test and acoustic inversion device, wherein the device comprises a whole device supporting and adjusting mechanism I, a microphone array longitudinal motion control mechanism II, a microphone array rotary motion control mechanism III, a microphone array vertical motion control mechanism IV, a microphone array transverse motion control mechanism V, a microphone correction control mechanism VI and a virtual ball setting reference position positioning measurement column VII; the device is simple to install and debug, a large amount of manpower and material resources can be reduced through measurement and inversion calculation, the labor intensity of people can be reduced, the precision of measured data and the accuracy of the result of inversion calculation can be improved, and meanwhile the device is particularly suitable for large-scale field operation of free, complex and stable sound fields.
Description
Technical Field
The invention relates to an acoustic measurement and inversion device, in particular to a novel small acoustic holographic measurement and inversion device for a free sound field.
Background
The near-field acoustic holography technology is a hotspot of acoustic research in recent years, and by using the near-field acoustic holography technology (NAH), sound source identification and positioning can be accurately performed, and near-field sound field reconstruction and visualization can be realized by using the technology, so the research of the NAH technology has great practical significance for suppressing noise pollution, the key of the NAH technology is how to measure the distribution of complex sound pressure on a holographic surface and how to perform acoustic inversion on a free sound field by using the complex sound pressure on the holographic surface, the existing testing device and the inversion device are heavy, are very troublesome to debug and install, have large workload, need a large amount of manpower and material resources, generally cannot be completed on site, and the inversion calculation needs to be returned to a laboratory for processing, so that a novel small and light-weight multi-holographic testing and inversion device is necessary to be invented, is not the key point of the invention in a corresponding intelligent control system, and is not described in detail here, and the device is suitable for large-scale and stable operation of the large-scale and the labor intensity of people and the free sound field inversion can be reduced.
Disclosure of Invention
The invention aims to provide a novel small and light sound pressure testing and acoustic inversion device for thorium to overcome the defects of the prior art, the device is simple to install and debug, various holographic surfaces can be selected during measurement, a large amount of manpower and material resources can be reduced during measurement and acoustic inversion, the labor intensity of people can be reduced, meanwhile, a novel correction and calculation method is adopted during data measurement, the precision of measured data is greatly improved, in addition, the measurement and inversion device adopts an embedded system, the device can be made very small, particularly, a parallel processing technology is adopted in the embedded system, the calculation result can be obtained on site, and the device is not suitable for field operation.
In order to achieve the purpose, the invention adopts the technical scheme that: a free sound field small-sized acoustic holographic measurement and inversion device comprises a whole device supporting and adjusting mechanism I, a microphone array longitudinal motion control mechanism II, a microphone array rotary motion control mechanism III, a microphone array vertical motion control mechanism IV, a microphone array transverse motion control mechanism V, a microphone correction control mechanism VI and a virtual ball setting reference position positioning measurement column VII; the whole device supporting and adjusting mechanism I comprises an adjusting support I, an adjusting support II and an adjusting support III, the three adjusting supports are respectively connected with screw holes on a base plate through respective lead screw motors, a fixed counterweight round table is arranged on the base plate and fixed on the base plate, a horizontal position sensor K1 and a horizontal position sensor K2 are further arranged on the base plate, the upper surface of the fixed counterweight round table is connected with a vertical supporting rod, the upper end of the vertical supporting rod is connected with a longitudinal and rotary motion component mounting platform, a laser receiver is further arranged at the upper end of the vertical supporting rod, and an electrical box and a miniature liquid crystal display touch screen are arranged on the side surface of the longitudinal and rotary motion component mounting platform; the microphone array rotary motion control mechanism III comprises a first stepping motor D1 and a second stepping motor D2 which are arranged below a longitudinal and rotary motion component mounting platform, the first stepping motor D1 is connected with one gear of an upper special-shaped gear pair I arranged on the longitudinal and rotary motion component mounting platform through a bearing, the second stepping motor D2 is connected with the other gear of the special-shaped gear pair I through a bearing, and the special-shaped gear pair I is respectively connected with a longitudinal motion component S1 and a longitudinal motion component S2 of a longitudinal motion control mechanism II through a mechanical connecting component arranged on the longitudinal and rotary motion component mounting platform; the microphone array longitudinal motion control mechanism II comprises a longitudinal motion component S1 and a longitudinal motion component S2 which are respectively connected with a special-shaped gear pair I through a mechanical connection component, the longitudinal motion component S1 is also connected with a rack G3 of the rigid motion component S1 through a screw rod sleeve I of the longitudinal motion component S1, and the longitudinal motion component S2 is also connected with a rack G4 of the rigid motion component S2 through a screw rod sleeve II of the longitudinal motion component S2; the microphone array vertical motion control mechanism IV comprises a vertical motion component S1 and a vertical motion component S2, the vertical motion component S1 is connected with a matrix T2 of a microphone array main mounting arm S2 of the microphone array transverse motion control mechanism V through a screw rod sleeve III of the vertical motion component S1, and the vertical motion component S2 is connected with the matrix T1 of the microphone array main mounting arm S1 of the microphone array transverse motion control mechanism V through a screw rod sleeve IV of the vertical motion component S2; the microphone array transverse motion control mechanism V 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 assembly S2 and the vertical motion assembly S1; the adjusting support I comprises a screw rod motor M1 and a base I, the screw rod motor M1 is arranged in the base I, the adjusting support II comprises a screw rod motor M2 and a base II, the screw rod motor M2 is arranged in the base II, the adjusting support III comprises a screw rod motor M3 and a base III, and the screw rod motor M3 is arranged in the base III.
The invention further adopts the technical scheme that a longitudinal movement assembly S1 comprises a rack 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, wherein the inner surface of one of two longitudinal plates of the rack G1 is provided with a sliding chute II, the inner surface of the other plate is provided with a sliding chute I, the bearing S2 is fixed on one of two transverse plates of the rack G1, the bearing S2 is connected with one end of the screw rod I, the other transverse plate of the rack G1 is fixed with the bearing S1, the bearing S1 is connected with the other end of the screw rod I, the screw rod I penetrates through the bearing S1 to be connected with one gear of the gear pair II, the other gear of the gear pair II is connected with the third stepping motor D3, the screw rod sleeve I is sleeved on the screw rod I, and transverse rods of the screw rod sleeve I are respectively arranged on the sliding chute I and the sliding chute II; the longitudinal motion assembly S2 comprises a rack 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, wherein a chute IV is formed in the inner surface of one of two longitudinal plates of the rack G2, a chute III is formed in the inner surface of the other plate, the bearing S4 is fixed on one of two transverse plates of the rack G2, the bearing S4 is connected with one end of the screw rod II, a bearing S3 is fixed on the other transverse plate of the rack G2, the bearing S3 is connected with the other end of the screw rod II, the screw rod II penetrates through the bearing S3 to be connected with one gear of the gear pair III, the other gear of the gear pair III is connected with the fourth stepping motor D4, the screw rod sleeve II is sleeved on the screw rod II, and transverse rods of the screw rod sleeve II are respectively arranged on the chute III and the chute IV; the vertical motion assembly S1 comprises a rack 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, wherein a chute VI is arranged on the inner surface of one of two longitudinal plates of the rack G3, a chute V is arranged on the inner surface of the other plate, the bearing S6 is fixed on one of two transverse plates of the rack G3, the bearing S6 is connected with one end of the screw rod III, the bearing S5 is fixed on the other transverse plate of the rack G3, the bearing S5 is connected with the other end of the screw rod III, the screw rod III penetrates through the bearing S5 to be connected with one gear of the gear pair IV, the other gear of the gear pair IV is connected with the fifth stepping motor D5, the screw rod sleeve III is sleeved on the screw rod III, and transverse rods of the screw rod sleeve III are respectively arranged on the chutes V and the chutes VI; the vertical motion assembly S2 comprises a rack 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, wherein a chute VIII is arranged on the inner surface of one of two longitudinal plates of the rack G4, a chute VII is arranged on the inner surface of the other plate, the bearing S8 is fixed on one of two transverse plates of the rack G4, the bearing S8 is connected with one end of the screw rod IV, a bearing S7 is fixed on the other transverse plate of the rack G4, the bearing S7 is connected with the other end of the screw rod IV, the screw rod IV penetrates through the bearing S7 to be connected with one of gears of the gear pair V, the other gear of the gear pair V is connected with the sixth stepping motor D6, the screw rod sleeve IV is sleeved on the screw rod IV, and transverse rods of the screw rod sleeve IV are respectively arranged on the chutes VII and the chutes VIII.
According to a further technical scheme, the microphone array main mounting arm S1 comprises a base body T1, one end of the base body T1 is provided with a bearing S10, the other end of the base body T1 is provided with a bearing S9, the middle of the base body T1 is hollow and is provided with a gear rod I, two ends of the gear rod I are respectively fixed on the bearing S10 and the bearing S9, one surface of the base body T1 is provided with a stepping motor D7, the stepping motor D7 is fixed on the base body T1, a seventh stepping motor D7 is provided with a gear W1 in a shaft, the gear W1 is meshed with the gear rod I through a notch I, the other surface of the base body T1 is provided with a plurality of opening grooves for mounting microphone array sub-mounting arms, and the upper end of the base body T1 is also provided with a calibration microphone I; the microphone array main mounting arm S2 comprises a base body T2, one end of the base body T2 is provided with a bearing S12, the other end of the base body T2 is provided with a bearing S11, the middle of the base body T2 is hollow, a gear rod II is mounted, two ends of the gear rod II are respectively fixed on the bearing S12 and the bearing S11, one side of the base body T2 is provided with an eighth stepping motor D8, the eighth stepping motor D8 is fixed on the base body T2, a gear W2 is mounted on a shaft of the eighth stepping motor D8, the gear W2 is meshed with the gear rod II through a notch II, the other side of the base body T2 is provided with a plurality of opening grooves for mounting microphone array sub-mounting arms, and the upper end of the base body T1 is also provided with a calibration microphone II; the microphone array sub-mount arm 22) includes a substrate having racks on both sides of the back surface thereof and a plurality of microphone insertion bases on the front surface thereof, on which the microphones are inserted.
According to a further technical scheme, the microphone correction control mechanism I comprises a ninth stepping motor D9, a sleeve I, a microphone insertion opening I, a miniature muffling cavity I, a reciprocal acoustic transducer G1, a spring I, a connecting piece L1, a reciprocal acoustic transducer G2, an electromagnet P1, a double-sliding-groove C1 and an electromagnetic coil U1, wherein the ninth stepping motor D9 is fixed on a rack G4 of a vertical motion assembly S2, the ninth stepping motor D9 is connected with one end of the connecting piece L1 through a lead screw, the other end of the connecting piece L1 is connected with the sleeve I, a cylindrical semi-through hole is formed in the sleeve I, the double-sliding-groove C1 and the electromagnet P1 are arranged in the hole, an ear rod of the electromagnet P1 is placed on the double-sliding-groove C1, the electromagnetic coil U1 is arranged on the electromagnet P1, the spring I is sleeved at the other end of the electromagnet P1 and connected with the miniature muffling cavity I, the reciprocal acoustic transducer G1 is arranged at one end in the miniature muffling cavity I, the reciprocal acoustic transducer G2 is arranged at the middle of the miniature muffling cavity I; the microphone correction control mechanism II comprises a tenth stepping motor D10, a sleeve II, a microphone insertion hole II, a miniature muffling cavity II, a reciprocal acoustic transducer G3, a spring II, a connecting piece L2, a reciprocal acoustic transducer G4, an electromagnet P2, a double-sliding-groove C2 and an electromagnetic coil U2, wherein the tenth stepping motor D10 is fixed on a rack G3 of a vertical motion assembly S1, the tenth stepping motor D10 is connected with one end of the connecting piece L2 through a lead screw, the other end of the connecting piece L2 is connected with the sleeve II, a cylindrical semi-through hole is formed in the sleeve II, a double-sliding-groove C2 and an electromagnet P2 are arranged in the hole, an ear rod of the electromagnet P2 is placed on the double-sliding-groove C2, the electromagnetic coil U2 is arranged on the electromagnet P2, the spring II is sleeved at the other end of the electromagnet P2 and connected with the miniature muffling cavity II, the reciprocal acoustic transducer G3 is arranged at one end in the miniature muffling cavity II, the other end of the miniature muffling cavity is provided with the reciprocal acoustic transducer G4, and the microphone insertion hole II is arranged in the middle of the miniature muffling cavity II.
According to a further technical scheme, the virtual ball setting reference position measuring column VI comprises a support, the support is connected with a vertical rod, a laser emitter is arranged at the upper end of the vertical rod, and a microphone socket is arranged at the upper end of the vertical rod.
Due to the adoption of the structure, the small-sized acoustic holographic measurement and inversion device for the free sound field has the following beneficial effects:
1) The device is simple, light and convenient to debug.
The small-sized acoustic holographic measurement and inversion device for the free sound field has a simple structure, is light and handy, overcomes the defect of heaviness in the device, only needs to be simply installed, all subsequent tests and inversion calculations are automatically carried out under the control of a control system (not the key point of the invention, and are not described in detail here), manual intervention is not needed, manpower and material resources can be greatly saved, the labor intensity of people is reduced, and the small-sized acoustic holographic measurement and inversion device for the free sound field is particularly obvious in a free complex stable sound field of large-scale, multi-point tests and repeated inversion.
2) The data testing and calculation can be more accurate and reliable.
According to the small-sized acoustic holographic measurement and inversion device for the free sound field, manual intervention is not needed in most of work, and human errors are reduced, so that the tested data and the inversion result are more reliable and accurate.
The invention further discloses a free sound field small-sized acoustic holographic measuring and inverting device by combining the attached drawings and the embodiment.
Drawings
FIG. 1 is a schematic diagram of the general structure of a free sound field small-sized acoustic holographic measurement and inversion device of the present invention;
FIG. 2 is a partial schematic view of the whole device support structure of the small acoustic holographic measurement and inversion device of the free sound field of the present invention;
FIG. 3 is a partial schematic view of a longitudinal and vertical motion assembly and a microphone calibration mechanism of the small acoustic holographic measurement and inversion device for free sound field according to the present invention;
FIG. 4 is a schematic structural diagram of a microphone array main mounting arm S1 of a free sound field small-sized acoustic holographic measurement and inversion device of the present invention;
FIG. 5 is a schematic structural diagram of a microphone array main mounting arm S2 of a free sound field small-sized acoustic holography measurement and inversion device of the present invention;
FIG. 6 is a schematic view of a longitudinal movement assembly S1 of the free sound field small-sized acoustic holography measurement and inversion device of the present invention;
FIG. 7 is a schematic view of the elevation structure of a longitudinal motion assembly S1 of the small acoustic holographic measurement and inversion device for free sound field according to the present invention;
FIG. 8 is a schematic view of a longitudinal moving component S2 of the free sound field small-sized acoustic holography measurement and inversion device of the present invention;
FIG. 9 is a schematic view of the longitudinal moving assembly S2 of the free sound field miniature acoustic holography measurement and inversion apparatus of the present invention;
FIG. 10 is a schematic view of a vertical motion assembly S1 of the free sound field small-sized acoustic holography measurement and inversion device of the present invention;
FIG. 11 is a schematic view of the elevation structure of a vertical motion assembly S1 of the free sound field small-sized acoustic holography measurement and inversion device of the present invention;
FIG. 12 is a schematic view of a vertical moving component S2 of the free sound field small-sized acoustic holography measurement and inversion device of the present invention;
FIG. 13 is a schematic view of the elevation structure of a vertical motion assembly S2 of the free sound field small-sized acoustic holography measurement and inversion apparatus of the present invention;
FIG. 14 is a schematic view of the internal structure of an adjusting support I of the small acoustic holographic measurement and inversion device for free sound field of the present invention;
FIG. 15 is a schematic view of the internal structure of an adjusting support II of the small acoustic holographic measurement and inversion device for free sound field of the present invention;
FIG. 16 is a schematic view of the internal structure of a free sound field small-sized acoustic holography measurement and inversion device adjusting support III of the present invention;
FIG. 17 is a schematic structural diagram of a microphone calibration mechanism I of a free sound field small-sized acoustic holographic measurement and inversion device of the present invention;
FIG. 18 is a schematic view of the internal structure of a microphone calibration mechanism I of a free sound field small-scale acoustic holography measurement and inversion device of the present invention;
FIG. 19 is a schematic structural diagram of a microphone calibration mechanism II of a free sound field small-scale acoustic holography measurement and inversion device of the present invention;
FIG. 20 is a schematic view of the internal structure of a microphone calibration mechanism II of a free sound field small-sized acoustic holography measurement and inversion device of the present invention;
FIG. 21 is a schematic diagram of a microphone array sub-mounting arm of a microphone and a microphone sub-mounting arm for mounting the microphone in the free sound field small-sized acoustic holography measurement and inversion device of the present invention;
FIG. 22 is a free sound field small-sized acoustic holography measuring and inverting device of the present invention, a virtual ball setting reference position measuring column VI;
FIG. 23 is a schematic diagram of electromagnets P1 and P2 of the small-sized acoustic holography measurement and inversion device for free sound field
FIG. 24 is a schematic side view of an open groove on a substrate T1, T2 of a free sound field small-sized acoustic holography measurement and inversion device of the present invention;
FIG. 25 is a block diagram of the overall structure of an intelligent control system for controlling a free sound field small-scale acoustic holography measuring and inverting device of the present invention;
FIG. 26 is a block diagram of the internal structure of an intelligent control system for controlling a free sound field small-sized acoustic holography measurement and inversion device according to the present invention;
fig. 27 is a schematic diagram of an internal structure of a sound pressure testing and acoustic inversion calculation module of an intelligent control system for controlling a free sound field small-sized acoustic holographic measuring and inversion device according to the present invention;
fig. 28 is a block diagram of the internal structure of an intelligent control system information input display module for controlling a free sound field small-sized acoustic holography measurement and inversion device of the present invention.
Description of the main element reference numbers: 1 an adjusting support I, 2 an adjusting support II, 3 an adjusting support III, 4 a base plate, 5 a fixed counterweight circular table, 6 a horizontal position sensor K1, 7 a horizontal position sensor K2, 8 a vertical support rod, 9 an electrical appliance box, 10 a miniature liquid crystal display touch screen, 11 a laser receiver, 12 a longitudinal and rotary motion component mounting platform, 13 a special-shaped gear pair I, 14 a first stepping motor D1, 15 a second stepping motor D2, 16 a longitudinal motion component S1, 17 a longitudinal motion component S2, 18 a vertical motion component S1, 19 a vertical motion component S2, 20 a microphone array main mounting arm S1, 21 a microphone array main mounting arm S2, 22 a microphone array sub-mounting arm, 23 a microphone, 24 a mechanical device, 25 a microphone correcting mechanism I, 26 a microphone correcting mechanism II, 27 a calibration microphone S1, 28 a calibration microphone S2 29, a support, 30 a vertical rod, 31 a laser emitter, 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 screw I, 1606 a screw cover I, 1607 a bearing S2, 1608 a chute I, 1609 a chute II, 1701 a frame G2, 1702 a bearing S3, 1703 a gear pair III, 1704 a fourth stepping motor D4, 1705 a screw II 1706 a screw bushing II, 1707 a bearing S4, 1708 a chute III, 1709 a chute IV, 1801 a rack G3, 1802 a bearing S5, 1803 a gear pair IV, 1804 a fifth stepping motor D5, 1805 a screw III, 1806 a screw bushing III, 1807 a bearing S6, 1808 a chute V, 1809 a chute VI, 1901 a rack G4, 1902 a bearing S7, 1903 a gear pair V, 1904 a sixth stepping motor D6, 1905 a screw IV, 1906 a screw rod sleeve IV, 1907 a bearing S8, 1908 a sliding groove VII, 1909 a sliding groove VIII, 101 an adjusting support I base, 102 a first screw rod motor M1, 201 an adjusting support II base, 202 a second screw rod motor M2, 301 an adjusting support III base, 302 a third screw rod motor M3, 2001 a base T1, 2002 a bearing S9, 2003 a seventh stepping motor D7, 2004 a gear W1, 2005 a bearing S10, 2006 a notch I, 2007 a gear rod I, 2101 a base T2, 2102 a bearing S11, 2103 an eighth stepping motor D8, 2104 a gear W2, 2105 a bearing S12, 2106 a notch II, 2107 a gear rod II, 2201 a rack, 2202 sub-mounting arm substrate 2203 a microphone insert base, 2501 a ninth step motor D9, 2502 a sleeve I, 2503 a microphone insert port I, 2504 a miniature anechoic chamber I, 2505 a reciprocal acoustic transducer G1, 2506 a spring I, 2507 a connector L1, 2508 a reciprocal acoustic transducer G2, 2509 an electromagnet P1, 2510 a double-chute C1, 2511 an electromagnetic coil B1, 2601 a tenth step motor 010, 2602 a sleeve II, 2603 a microphone insert port II, 2604 a miniature anechoic chamber II, 2605 a reciprocal acoustic transducer G3, 2606 a spring II, 2607 a connector L2, 2608 a reciprocal acoustic transducer G4, 2609 an electromagnet P2, 2610 a double-chute C2, 2611 an electromagnetic coil B2
Detailed Description
As shown in fig. 1 to 24, the small-sized acoustic holographic measurement and inversion device for the free sound field comprises a whole device supporting and adjusting mechanism I, a microphone array longitudinal motion control mechanism II, a microphone array rotary motion control mechanism III, a microphone array vertical motion control mechanism IV, a microphone array transverse motion control mechanism V, a microphone correction control mechanism VI, and a virtual ball setting reference position positioning measurement column VII; the whole device supporting and adjusting mechanism I comprises an adjusting support I1, an adjusting support II 2 and an adjusting support III 3, the three adjusting supports are respectively connected with screw holes on a base plate 4 through respective screw rod motors, a fixed counterweight circular table 5 is arranged on the base plate 4, the fixed counterweight circular table 5 is fixed on the base plate 4, the fixed counterweight circular table 4 can increase the weight of the base to prevent the whole mechanism from overturning, the base plate 4 is also provided with a horizontal position sensor K1 and a horizontal position sensor K2, the two horizontal position sensors can detect the levelness of the base plate 4 in two directions, the levelness of the base plate 4 can be adjusted by combining the adjusting supports I, II and III, the upper surface of the fixed counterweight circular table 5 is connected with a vertical supporting rod 8, the upper end of the vertical supporting rod 8 is connected with a vertical and rotary motion component mounting platform 12, the upper end of the vertical supporting rod 8 is also provided with a laser receiver 11, an electric appliance box 9 and a micro liquid crystal display touch screen 10 are arranged on the side surface of the vertical and rotary motion component mounting platform 12, a circuit board related to a control system is arranged in the box 9, and the micro liquid crystal display touch screen 10 can complete the input of some preset data and the result display of the test calculation; the microphone array rotary motion control mechanism III comprises a first stepping motor D1 and a second stepping motor D2 which are arranged below a longitudinal and rotary motion component mounting platform 12, wherein the first stepping motor D1 is connected with one gear of a special-shaped gear pair I13 arranged on the longitudinal and rotary motion component mounting platform 12 through a bearing, the second stepping motor D2 is connected with the other gear of the special-shaped gear pair I13 through a bearing, the special-shaped gear pair I13 is respectively connected with a longitudinal motion component S1 and a longitudinal motion component S2 of a longitudinal motion control mechanism II through a mechanical connecting component 24 arranged on the longitudinal and rotary motion component mounting platform 12, and the longitudinal motion component S1 and the longitudinal motion component S2 are driven to rotate through the forward and reverse motions of the first stepping motor D1 and the second stepping motor D2 so as to drive the forward and reverse rotation of the special-shaped gear pair I13 and drive the longitudinal motion component S1 and the longitudinal motion component S2 to rotate so as to drive the rotation of a microphone array; the microphone array longitudinal motion control mechanism II comprises a longitudinal motion component S1 and a longitudinal motion component S2 which are respectively connected with a special-shaped gear pair I13 through a mechanical connecting component 24, wherein the longitudinal motion component S1 is also connected with a rack G3 of the rigid motion component S1 through a screw rod sleeve I1606 thereof, and the longitudinal motion component S2 is also connected with a rack G4 of the rigid motion component S2 through a screw rod sleeve II 1706 thereof; the microphone array vertical motion control mechanism IV comprises a vertical motion component S1 and a vertical motion component S2, wherein the vertical motion component S1 is connected with a matrix T2 of a microphone array main mounting arm S2 of the microphone array transverse motion control mechanism V through a screw rod sleeve III 1806 of the vertical motion component S1, and the vertical motion component S2 is connected with a matrix T1 2001 of a microphone array main mounting arm S1 20 of the microphone array transverse motion control mechanism V through a screw rod sleeve IV 1906 of the vertical motion component S2; the microphone array transverse motion control mechanism V comprises a microphone array main mounting arm S1, a microphone array main mounting arm S2, a plurality of microphone array sub-mounting arms 22 and a plurality of microphones 23, wherein 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, and the microphones 23 are mounted on the microphone array sub-mounting arms 22; the microphone correction control mechanism VI comprises a microphone correction mechanism I25 and a microphone correction mechanism II 26, and the microphone correction mechanism I25 and the microphone correction mechanism II 26 are respectively fixed on the vertical movement component S2 and the vertical movement component S1; the adjusting support I1 comprises a first lead screw motor M1 102 and a base I101, the first lead screw motor M1 102 is arranged in the base I101, the adjusting support II 2 comprises a second lead screw motor M2 202 and a base II 201, the second lead screw motor M2 202 is arranged in the base II 201, the adjusting support III 3 comprises a third lead screw motor M3 302 and a base III 301, the third lead screw motor M3 302 is arranged in the base III 301, and the levelness of the base plate 4 can be adjusted through the forward and reverse movement of the first lead screw motor M1, the second lead screw motor M2 and the third lead screw motor M3.
The longitudinal movement assembly S1 16 comprises a frame G1 1601, a bearing S1 1602, a screw I1605, a screw sleeve I1606, a bearing S2 1607, a gear pair II 1603 and a third stepping motor D3 1604, wherein a sliding groove II 1609 is arranged on the inner surface of one of two longitudinal plates of the frame G1 1601, a sliding groove I1608 is arranged on the inner surface of the other one of the two longitudinal plates of the frame G1, the bearing S2 1607 is fixed on one of two transverse plates of the frame G1 1601, the bearing S2 1607 is connected with one end of the screw I1605, the bearing S1 1602 is fixed on the other transverse plate of the frame G1 1601, and the bearing S1 1602 is connected with the other end of the screw I1605, the screw rod I1605 penetrates through the bearing S1 1602 to be connected with one gear of the gear pair II 1603, the other gear of the gear pair II 1603 is connected with the third stepping motor D3 1604, the screw rod sleeve I1606 is sleeved on the screw rod I1605, the transverse rod of the screw rod sleeve I1605 is respectively arranged on the sliding groove I1608 and the sliding groove II 1609, the screw rod I1605 is driven to rotate through the forward and reverse rotation of the third stepping motor D3 1604 and then driven to slide on the sliding groove I1608 and the sliding groove II 1609 through the transmission of the gear pair II 1603, so that the vertical movement component S1 18 is driven to move longitudinally, and then the microphone array of the microphone array main mounting arm S2 is driven to move longitudinally; the longitudinal motion assembly S2 17 includes a rack G2 1701, a bearing S3 1702, a screw II 1705, a screw sleeve II 1706, a bearing S4 1707, a gear pair III 1703, and a fourth stepping motor D4 1704, wherein one of two longitudinal plates of the rack G2 1701 is provided with a slide IV 1709, the other is provided with a slide III 1708, the bearing S4 1707 is fixed on one of two transverse plates of the rack G2 1701, the bearing S4 1707 is connected to one end of the screw II 1705, the other transverse plate of the rack G2 is fixed with the bearing S3 1702, the bearing S3 1702 is connected to the other end of the screw II 1705, the screw II 1705 passes through the bearing S3 1702 to be connected to one of the gears 1703 of the gear pair III 1703, the other gear of the gear pair III 1703 is connected to the fourth stepping motor D4, the screw sleeve II 1706 is sleeved on the screw II 1705, the transverse rods of the screw sleeve II 1705 are respectively placed on the slide IV 8 and the slide IV 9, the slide IV 1709 of the microphone array II 1703, and the microphone 1703 is further driven by the slide of the slide IV assembly S1 and the slide on the slide IV 5, and the slide on the slide groove III 1 of the microphone array II 1708, thereby driving the slide S1 of the screw sleeve II and the slide assembly S1; the vertical motion assembly S1 includes a rack G3 1801, a bearing S5 1802, a lead screw III 1805, a lead screw sleeve III 1806, a bearing S6 1807, a gear pair IV 1803, and a fifth stepping motor D5 1804, wherein an inner surface of one of two longitudinal plates of the rack G3 1801 is provided with a chute VI 1809, an inner surface of the other plate is provided with a chute V1808, the bearing S6 1807 is fixed on one of two transverse plates of the rack G3 1801, the bearing S6 1807 is connected with one end of the lead screw III 1805, the other transverse plate of the rack G3 1801 is fixed with the bearing S5 1802, the bearing S5 1802 is connected with the other end of the lead screw III 1805, the lead screw III 1805 passes through the bearing S5 1802 and is connected with one of the gear pair IV 1803, the other gear of the gear pair IV 1803 is connected with a fifth stepping motor D5 1804, the lead screw sleeve III 1806 is sleeved on the lead screw III 1805, transverse rods of the lead screw sleeve III 1805 are respectively placed on the chutes V1808 and the chute 1809, the fifth stepping motor D1805 is connected with a forward and backward movement of the microphone array 1805, and the microphone is further carried out by a sliding motion of the chute V1802, and the chute 1805, and the microphone array of the chute 1805, and the chute 1805, so as a microphone array of the slide groove V1808, and a microphone, and the microphone is mounted on the chute 1805; the vertical motion assembly S2 comprises a rack G4 1901, a bearing S7 1902, a screw rod IV 1905, a screw rod sleeve IV 1906, a bearing S8 1907, a gear pair V1903 and a sixth stepping motor D6 1904, wherein the inner surface of one of two longitudinal plates of the rack G4 1901 is provided with a sliding groove VIII 1909, the inner surface of the other block is provided with a sliding groove VII 1908, the bearing S8 1907 is fixed on one of the two transverse plates of the rack G4 1901, the bearing S8 1907 is connected with one end of the screw rod IV 1905, the other transverse plate of the rack G4 1901 is fixed with the bearing S7, the bearing S7 1902 is connected with the other end of the screw rod IV 1905, the screw rod IV 1905 passes through the bearing S7 to be connected with one gear of the gear pair V1903, the other gear of the gear pair V1903 is connected with the sixth stepping motor D1906, the screw rod sleeve IV 1906 is sleeved on the screw rod IV 1905, the transverse rods IV 1905 of the screw rod sleeve IV 1905 are respectively placed on the sliding grooves VII 1908 and 1909, the sixth stepping motor D1904 drives the screw rod IV 1904 to rotate, the microphone array 1904, the microphone 1904 to rotate, and then drives the microphone array IV 1908, and the microphone to rotate, and the microphone array IV 1908, and the microphone 1908 and the microphone array 1904 to rotate;
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, the other end of the base body T1 is provided with a bearing S9 2002, the middle of the base body T1 2001 is hollow and is provided with a gear rod I2007, two ends of the gear rod I2007 are respectively fixed on the bearing S10 2005 and the bearing S9 2002, one surface of the base body T1 2007 is provided with a stepping motor D7 2003, the stepping motor D7 2003 is fixed on the base body T1 2001, a seventh stepping motor D7 2003 is provided with a gear W1 2004 on the shaft, the gear W1 2004 is meshed with the gear rod I2007 through a notch I2006, the other surface of the base body T1 2001 is provided with a plurality of open grooves for mounting the microphone array sub-mounting arm 22, the upper end of the base body T1 is further provided with a calibration I27, and the microphone array sub-mounting arm 22 is driven to rotate through the transmission of the gear W1 2004 through the forward and reverse rotation of the seventh stepping motor D7 2003; the microphone array main mounting arm S2 comprises a base body T2 2101, one end of the base body T2 2101 is provided with a bearing S12 2105, the other end of the base body T2 2101 is provided with a bearing S11 2102, the middle of the base body T2 2101 is hollow, a gear rod II 2107 is mounted, two ends of the gear rod II 2107 are respectively fixed on the bearing S12 2105 and the bearing S11 2102, one side of the base body T2 2101 is provided with an eighth stepping motor D8 2103, the eighth stepping motor D8 2103 is fixed on the base body T2 2101, a gear W2 2104 is mounted on an shaft of the eighth stepping motor D8 2103, the gear W2 2104 is meshed with the gear rod II 2107 through a notch II 2106, the other side of the base body T2 2101 is provided with a plurality of open grooves for mounting the microphone array sub-mounting arm 22, the upper end of the base body T1 is further provided with a calibration microphone II 28, the microphone is driven to rotate through the forward and backward rotation of the eighth stepping motor D8 2103 through the transmission of the gear W2 to drive the gear II 2107 to rotate, and further drive the microphone array sub-mounting arm 22 to move transversely; the microphone array sub-mounting arm 22 includes a substrate 2202, two sides of the back of the substrate 2202 are provided with racks 2201, the front is provided with a plurality of microphone insertion bases 2203, and the microphones 23 are inserted into the microphone insertion bases 2203.
The microphone correction control mechanism I25 comprises a ninth stepping motor D9 2501, a sleeve I2502, a microphone insertion port I2503, a miniature muffling cavity I2504, a reciprocal acoustic transducer G1 2505, a spring I2506, a connecting piece L1 2507, a reciprocal acoustic transducer G2 2508, an electromagnet P1 2509, a double-sliding-groove C1 2510 and an electromagnetic coil U1 2511, wherein the ninth stepping motor D9 2501 is fixed on a rack G4 1901 of a vertical movement assembly S2 19, the ninth stepping motor D9 2501 is connected with one end of the connecting piece L1 2507 through a screw rod, the other end of the connecting piece L1 2507 is connected with the sleeve I2502, a cylindrical semi-through hole is arranged in the sleeve I2502, the double-sliding-groove C1 2510 and the electromagnet P1 2509 are arranged in the hole, an ear rod of the electromagnet P1 2509 is placed on the double-sliding-groove C1 2510, and the electromagnetic coil U1 2511 is arranged on the electromagnet P1 2509, a spring I2506 is sleeved at the other end of the electromagnet P1 2509 and connected with a miniature muffling cavity I2504, a reciprocal acoustic transducer G1 2505 is arranged at one end inside the miniature muffling cavity I2504, a reciprocal acoustic transducer G2 2508 is arranged at the other end, a microphone insertion port I2503 is arranged in the middle of the miniature muffling cavity I2504, the microphone correction control mechanism I25 can rotate 90 degrees in the forward direction or 90 degrees in the reverse direction through a ninth stepping motor D9 2501 and transmission is realized through a connecting piece L1 7, the electromagnet P1 2509 can slide in a double-sliding groove C1 2510 through power failure of an electromagnetic coil U1 2511, the miniature muffling cavity I2504 is driven to extend and retract, and the microphone insertion port I3 of the miniature muffling cavity I2504 is sleeved with a microphone 23 or separated from the microphone 23; the microphone calibration control mechanism II 26 comprises a tenth stepping motor D10 2601, a sleeve II 2602, a microphone insertion opening II 2603, a miniature muffling cavity II 2604, a reciprocal acoustic transducer G3 2605, a spring II 2606, a connecting piece L2 2607, a reciprocal acoustic transducer G4 2608, an electromagnet P2 2609, a double sliding groove C2 2610 and an electromagnetic coil U2 2611, wherein the tenth stepping motor D10 2601 is fixed on a frame G3 1801 of a vertical motion assembly S1 18, the tenth stepping motor D10 2601 is connected with one end of the connecting piece L2 2607 through a screw rod, the other end of the connecting piece L2 2607 is connected with the sleeve II 2602, a cylindrical semi-through hole is arranged inside the sleeve II 2602, the double sliding groove C2 2610 and the electromagnet P2 2609 are arranged in the hole, an ear rod of the electromagnet P2 2609 is placed on the double sliding groove C2 2610, and the electromagnetic coil U2 2611 is arranged on the electromagnet P2 2609, the other end of the electromagnet P2 2609 is sleeved with a spring II 2606 and is connected with a micro muffling cavity II 2604, one end of the inside of the micro muffling cavity II 2604 is provided with a reciprocal acoustic transducer G3 2605, the other end of the inside of the micro muffling cavity II 2604 is provided with a reciprocal acoustic transducer G4 2608, the middle part of the micro muffling cavity II 2604 is provided with a microphone insertion port II 2603, the microphone correcting control mechanism II 26 can rotate 90 degrees in the forward direction or 90 degrees in the reverse direction through a tenth stepping motor D10 2601 and then is transmitted through a connecting piece L2 2607, the electromagnet U2 2611 can lead the electromagnet P2 2609 to slide in a double sliding groove C2 2610 so as to drive the micro muffling cavity II 2604 to extend and retract, and lead the microphone insertion port II 2603 of the micro muffling cavity II 2604 to be sleeved with a microphone 23 or leave the microphone 23, the microphone correcting control mechanism II 26 is mainly used as a spare for the microphone correcting control mechanism I25, when the microphone is damaged compared with the control mechanism I2, the microphone plays a role again;
the virtual ball setting reference position measuring column VI comprises a support 29, the support 29 is connected with a vertical rod 30, the upper end of the vertical rod 30 is provided with a laser transmitter 31, the upper end of the vertical rod is provided with a microphone socket 32, and the reference column mainly determines the virtual ball setting reference position in acoustic inversion.
The invention relates to an intelligent control system of a free sound field small-sized acoustic holography measurement and inversion device (which is not the key point of the invention and is only briefly described here), which comprises a control center module 70, an auxiliary module 71 respectively connected with the control center module, an upper computer interface module 72, an information input display module 73, a distance measurement module 74, a sound pressure test and acoustic inversion calculation module 75, a whole device horizontal adjustment driving module 76, a microphone array vertical motion driving module 77, a microphone array rotary motion driving module 78, a microphone array transverse motion driving module 79, a microphone array longitudinal motion driving module 80, a microphone array correction motion driving module 81 and a sensor signal input module 82; the control process comprises the following steps: firstly, the system is powered on, firstly, the control center module 70 is initialized, then whether the initialization is successful or not is judged, if not, whether the initialization is overtime or not is judged, if not, whether the initialization is successful or not is continuously judged, if yes, a system error is displayed, if yes, the control center module 70 sends an initialization command to each sub-module and sends a response confirmation signal, then, whether all response signals are received or not is judged, if not, whether the initialization is overtime or not is judged, if yes, a system error is displayed, if not, whether all response signals are received or not is continuously judged, if yes, the system is ready to enter, and 'please input the parameter K, N', is formed 1 ，N 2 ，N 3 ，w[x]，H 1 (x 1 ，y 1 ，z 1 )，H 2 (x 2 ，y 2 ，z 2 )，H(x 3 ，y 3 ，z 3 )，h 1 Wherein x is 1 to N 2 Then entering a holographic surface shape selection flow path, entering a whole device horizontal positioning flow path after the holographic surface shape selection flow path is finished, entering a calibration data test channel multi-frequency amplitude and phase and calibration microphone multi-frequency amplitude sensitivity and phase test calculation flow path after the whole device horizontal positioning flow path is finished, entering a common to-be-tested data test channel amplitude and phase and microphone array multi-frequency amplitude sensitivity and phase calculation test flow path after the calibration data test channel multi-frequency amplitude and phase and calibration microphone multi-frequency amplitude sensitivity and phase test flow path is finished, entering a sound pressure test calculation flow path after the common to-be-tested data test channel amplitude and phase and microphone array multi-frequency amplitude sensitivity and phase calculation test flow path is finished, entering an acoustic inversion calculation flow path after the sound pressure test calculation flow path is finished, judging whether the test inversion task is finished or not, returning to the system if yes, using a parameter K in the flow as a holographic surface shape selection parameter, and N is used as an acoustic inversion calculation flow path, and finishing the acoustic inversion calculation flow path 1 For the number of microphones to be tested, which is also the number of test channels to be tested, N 2 For the number of frequencies to be corrected, N 3 The number of cycles, w [ x ], to collect for FFT computation]For the frequency value to be corrected, H 1 (x 1 ，y 1 ，z 1 ) Reference position coordinates, H, of the virtual sphere 2 (x 2 ，y 2 ，z 2 ) As position coordinates H of the holographic surface 3 (x 3 ，y 3 ，z 3 ) For reconstructing the position coordinates of the surface, h 1 Is the initial predetermined height of the support base I.
The holographic surface shape selection is divided into flow charts as shown in fig. 6, firstly, a selection parameter K is introduced, then, whether K equals 1 is judged, if yes, the holographic surface shape 1 is selected, if not, whether K equals 2 is judged, if yes, the holographic surface shape 2 is selected, if not, whether K equals 3 is judged, if yes, the holographic surface shape 3 is selected, if not, whether K equals 4 is judged, if yes, the holographic surface shape 4 is selected, and if not, the process is ended, and the parameter K in the flow charts is the holographic surface shape selection parameter.
The whole device horizontal positioning shunt control process comprises the following steps: firstly, a parameter h is introduced 1 Driving the first screw motor N1 to move to make the height of the supporting seat I equal to a given set value h 1 Detecting the value of a horizontal position sensor K2, then judging whether the value is greater than 0, if not greater than 0, driving a third screw rod N3 to move forward to raise a support seat III, then returning to detect the value of the horizontal position sensor K2, if greater than 0, driving the third screw rod N3 to move reversely, then returning to detect the value of the horizontal position sensor K2, if equal to 0, detecting the value of a horizontal position sensor K1, then judging whether the value is greater than 0, if not greater than 0, driving a second screw rod N2 motor to rotate forward, then returning to detect the value of the horizontal position sensor K1, raising a support seat II, if greater than 0, driving a second screw rod N2 motor to rotate reversely, then returning to detect the value of the horizontal position sensor K1, if equal to 0, ending, and finishing the process h in the flow 1 Is the initial predetermined height of the support base I.
The calibration data test channel multi-frequency amplitude and phase and calibration microphone multi-frequency amplitude sensitivity and phase test calculation flow chart control process is as follows; firstly, the parameter N is introduced 2 ，N 3 ，w[x]Wherein x ranges from 1 to N 2 Then gives a loop variable L 1 ，L 2 The preset initial value being 1, i.e. L 1 ＝1，L 2 =1, then assign value to frequency variable w and loop variable w = w [ L 2 ]，L 2 ＝L 2 +1, then calibrating the calibration data test channel single frequency amplitude and phase test calculation sub-flow, after the flow is finished, entering the calibration microphone single step rate amplitude sensitivity and phase test calculation sub-flow, and after the flow is finished, saving the output data of the two flows, namely:
B 1 [L 1 ][L 2 ]＝A j ，β 1 [L 1 ][L 2 ]＝θ j ，B 2 [L 1 ][L 2 ]＝A 04 ，β 2 [L 1 ][L 2 ]＝θ 04 ，B 3 [L 1 ][L 2 ]＝A n1 ，β 3 [L 1 ][L 2 ]＝θ n1 B 4 [l 1 ][L 2 ]＝A 01 ，β 4 [L 1 ][L 2 ]＝θ 01 and after the data storage is finished, judging L 2 Whether or not it is greater than N 2 If not, returning to assign values of the frequency variable w and the circulation variable, namely w = w [ L ] 2 ]，L 2 ＝L 2 +1, if greater, then L 2 ＝L 2 +1, then judging L 1 Whether it is greater than or equal to 1, if it is not greater than, L 1 ＝L 1 +1 and returns an assignment to the frequency variable w and the loop variable, i.e. w = w [ L [ ] 2 ]，L 2 ＝L 2 +1, if greater than or equal to 1, data B is output 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 ]Wherein L is 1 Is 1-1,L 2 Is 1 to N 2 And then ends the task, N in the flow 2 For the number of frequencies to be corrected, N 3 The number of cycles, w [ x ], to collect for FFT computation]Is the frequency value to be corrected.
The control process of the multi-frequency amplitude sensitivity and phase calculation test shunt of the common to-be-tested data test channel and the microphone array comprises the following steps: and (3) inputting parameters: n is a radical of 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 ]Wherein x ranges from 1 to N 2 ，L 1 Is 1 to 1,L 2 Is 1 to N 2 Then setting a circulation variable to be an initial value m 1 ＝1，m 2 =1, thenFrequency variable assignment w = w [ m ] 2 ]Then, entering a single frequency amplitude and phase test signal loading step flow of a single data test channel to be tested, entering a single frequency amplitude sensitivity and phase test signal loading step flow of a single microphone to be tested after the flow is finished, and obtaining the amplitude and phase of the test channel and the amplitude sensitivity and phase of the microphone after the flow is finished, namely:
and for variable m 2 Adding 1 and then assigning m 2 Then m is judged again 2 Whether or not it is greater than N 2 If not, return to assign a value of w = w [ m ] to the frequency variable 2 ]If greater than, m 1 ＝m 1 +1, then m is judged 1 Whether or not it is greater than N 1 If not, return to assign a value of w = w [ m ] to the frequency variable 2 ]If greater than, 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 ]In which C is 1 [m 1 ][m 2 ]，δ 1 [m 1 ][m 2 ]Are respectively m 1 The channel-to-be-tested data test channel has a frequency of wm 2 ]Amplitude and phase of C 2 [m 1 ][m 2 ]，δ 2 [m 1 ][m 2 ]Is m at 1 The frequency of the microphone to be tested is w m 2 ]M1 is 1 to N 1 ，m 2 Is 1 to N 2 。
The sound pressure test calculation flow chart control process comprises the following steps: an incoming parameter 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 ]Wherein m1 is 1 to N 1 ，m 2 Is 1 to N 2 X is 1 to N 2 (ii) a Then the loading and calculation of the signal, i.e. the synchronization pulse distribution subunit inside the main control unit 7501 gives the synchronization pulse, the internal DDS unit is under pulse synchronization, N 1 Respectively and simultaneously acquiring N by each data test channel 3 Periodic data, N 1 The group data is calculated and corrected by a one-dimensional and two-dimensional mixed FFT calculation subunit and a spectrum energy gravity center method correction subunit in the main control unit 7501 to obtain the frequency w [ x ]]Signal amplitude of (R m) 1 ][m 2 ]And phase psi [ m 1 ][m 2 ]Finally, find the holographic surface N 1 The holographic surface complex sound pressure at the point is as follows:
P[m 1 ][m 2 ]＝R[m 1 ][m 2 ]/(C 1 [m 1 ][m 2 ]＊C 2 [m 1 ][m 2 ])，
wherein m1 is 1 to N 1 ，m 2 Is 1 to N 2 And finally outputs the data P [ m ] 1 ][m 2 ]，
Then, P [ m ] ends 1 ][m 2 ]，
Is the m th on the holographic surface 1 The road microphone has a frequency of w m 2 ]Amplitude and phase of (d), m 1 Is 1 to N 1 ，m 2 Is 1 to N 2 。
The control process of the acoustic inversion calculation sub-flow chart comprises the following steps: the reference center coordinate H of the virtual sphere is transmitted 1 (x 1 ，y 1 ，z 1 ) Center coordinate H of holographic measuring surface 2 (x 2 ，y 2 ，z 2 ) Center coordinates H of the reconstructed surface 3 (x 3 ，y 3 ，z 3 ) Number N of virtual balls 4 And holographic H-plane complex sound pressure data Pm 1 ][m 2 ]，
Wherein m1 is 1 to N 1 ，m 2 Is 1 to N 2 Assigning the holographic surface complex sound pressure data P to P E (H) Then according to the equivalent source strength theoretical formula->
For unknown source intensity density function sigma (r) Q ) Performing bidirectional Fourier series expansion, and simultaneously utilizing two-dimensional FFT and trapezoidal formula to perform green function K (r, r) Q ) Discretizing to establish the relation matrix T between the acoustic holographic measuring surface and the virtual ball equivalent source strength sound pressure value H And thus p E (H)＝[T H ]Q，p E (H) For holographic surface measurements, Q is the virtual sphere unknown source intensity density function σ (r) Q ) Coefficient after bidirectional Fourier decomposition, and finally adopting and establishing T H The same method establishes H on the surface to be inverted + Transmission matrix between sound pressure value and simulated ball
Binding of p E (H)＝[T H ]Q and->
Evaluating->
And T H Carrying out regularization treatment to obtain:
In the above formulas, S' is a virtual source intensity distribution surface in the vibrating body, and σ (r) Q ) For the virtual source intensity function to be solved, K (r, r) Q ) Is an integral kernel function, i.e. green's function K (r, r) Q )＝g(r，r Q )＝(1/4πR)e ikR ，r Q And (3) the radius of a virtual sphere, r is the distance from the virtual source intensity to the measurement surface or the reconstruction surface.
The flow distribution control process of the calibration data test channel single frequency amplitude and phase test calculation step is as follows: incoming frequencyw and number of acquisition cycles N 3 The calculation step is as follows;
(a) The synchronization pulse distribution unit in the main control unit 7501 gives out the synchronization pulse, and the internal DDS unit gives out a sine wave signal s under the pulse synchronization r ＝A r e -jw Wherein A is r Is a signal s r W is the signal s r The signal is applied to the signal driving channel I7504 through the high-speed multi-branch electronic selection switch M1 7502, the signal is directly applied to the calibration data testing channel 7512 through the high-speed multi-branch electronic selection switch M2 (7505), and the signal becomes:
(b) The synchronous pulse distribution subunit in the main control unit 7501 gives out synchronous pulse, the internal DDS subunit gives out a sine wave signal s under the pulse synchronization r ＝A r e -jw Wherein A is r Is a signal s r W is the signal s r Frequency ofThe signal is added to a signal driving channel II 7503 through a high-speed multi-branch electronic selection switch M1 7502, the signal is directly added to a calibration data testing channel 7512 through a high-speed multi-branch electronic selection switch M2 7505, and the signal is changed into:
namely: a. The 02 ＝A r A q2 A j ，θ 02 ＝θ q2 +θ j In, to>
Synchronous sampling N 3 An integer period signal whose frequency is w signal/is calculated and corrected by one or two-dimensional mixed FFT calculation sub-unit and spectral energy center of gravity correction sub-unit in the main control unit 7501>
Amplitude A of 02 And phase theta 02 In the above formulae B q2 (jw) the frequency response function of signal drive channel II 7503 is, A q2 Is B q2 Magnitude of (jw), θ q2 Is B q2 (jw) phase delay angle, B j (jw) is the frequency response function of the calibration data test channel 7512, A j Is B j Magnitude of (jw), θ j Is B j (jw) phase delay angle.
(c) The synchronous pulse distribution subunit in the main control unit 7501 gives out synchronous pulse, the internal DDS subunit gives out a sine wave signal s under the pulse synchronization r ＝A r e -jw Wherein A is r Is a signal s r W is the signal s r The signal is added to the signal driving channel I7504 through the high-speed multi-branch electronic selection switch M1 7502, the signal is added to the signal driving channel II 7503 through the high-speed multi-branch electronic selection switch M2 7505, and is added to the calibration data testing channel 7512 through the high-speed multi-branch electronic selection switch M2 7505, and the signal becomes:
namely: a. The 03 ＝A r A q1 A q2 A j ，θ 03 ＝θ q1 +θ q2 +θ j To is aligned with
Synchronous sampling N 3 An integer period signal whose frequency is w signal/is calculated and corrected by one or two-dimensional mixed FFT calculation sub-unit and spectral energy center of gravity correction sub-unit in the main control unit 7501>
Amplitude A 03 And phase theta 03 Above formula B q1 (jw) frequency response function of Signal drive channel I7504, A q1 Is B q1 Magnitude of (jw), θ q1 Is B q1 (jw) phase delay angle, B j (jw) is the frequency response function of the calibration data test channel 7512, A j Is B j Magnitude of (jw), θ j Is B j (jw) phase delay angle, B q2 (jw) the frequency response function of signal drive channel II 7503 is, A q2 Is B q2 Magnitude of (jw), θ q2 Is B q2 (jw) phase delay angle.
(d) From A 01 ，A 02 ，A 03 ，A r Find A q1 ，A q2 ，A j From theta 01 ，θ 02 ，θ 03 Determining theta q1 ，θ q2 ，θ j Namely:
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 ，
finally, the step ofOutput A 01 ，A 02 ，A 03 ，A 04 ，θ 01 ，θ 02 ，θ 03 ，θ j ，N3。
The shunt control process of the single frequency amplitude sensitivity and phase test calculation step of the calibration microphone comprises the following steps: first, the parameters w, A are introduced 01 ，A 02 ，A 03 ，θ 01 ，θ 02 ，θ 03 ，N 3 The calculation steps are as follows:
(g1) Under the coordination of the microphone array rigid motion control mechanism IV and the microphone array transverse motion control mechanism V, the microphone inlet I2503 of the microphone correction mechanism I25 is inserted into the calibration transmitter 27, meanwhile, the synchronous pulse distribution unit in the main control unit 7501 gives out synchronous pulses, and the internal DDS sub-unit gives out a sine wave signal s under pulse synchronization r ＝A r e -jw Wherein A is r Is a signal s r W is the signal s r The signal is added to a signal driving channel I7504 through a high-speed multi-branch electronic selection switch M1 7502, then added to a reciprocal acoustic transducer G1 2505 through a high-speed multi-branch electronic selection switch M2 7505, and pushed to make the reciprocal acoustic transducer G1 2505 sound, a sound wave is radiated, the sound wave is received by a calibration microphone 27 which is r/2 away from the reciprocal acoustic transducer G1 2502, the signal is added to a calibration data testing channel 7512 through a high-speed multi-branch electronic selection switch M3 7509, and the signal becomes:
obtaining the following components: a. The 04 ＝A r A q1 A r1 A n1 A j ，θ 04 ＝θ q1 +θ tr1 +θ n1 +θ j To, for
Synchronous sampling N 3 An integer periodic signal, which is subjected to one-dimensional and two-dimensional mixing in the main control unit 7501The combined FFF calculation subunit and the spectral energy barycenter method correction subunit calculate and correct to obtain a signal which is at the frequency w>
Amplitude A 04 And phase theta 04 Above formula B q1 (jw) frequency response function of Signal drive channel I7504, A q1 Is B q1 Magnitude of (jw), θ q1 Is B q1 (jw) phase delay angle, B j (jw) is the frequency response function of the calibration data test channel 7512, A j Is B j Magnitude of (jw), θ j Is B j (jw) phase delay angle, B q2 (jw) the frequency response function of signal drive channel II 7503 is, A q2 Is B q2 Magnitude of (jw), θ q2 Is B q2 (jw) phase delay angle, B tr1 (jw) is the reciprocal acoustic transduction G1 2505 transmit frequency response function, A tr1 Is B tr1 Magnitude of (jw), θ tr1 Is B tr1 (jw) phase retardation angle, B n1 (w) is a function of the receive frequency response of the calibration microphone (27), A n1 Is B n1 Amplitude of (w), θ n1 Is B n1 (w) a phase delay angle.
(g2) Under the coordination of the microphone array rigid motion control mechanism IV and the microphone array transverse motion control mechanism V, the microphone inlet I2503 of the microphone correction mechanism I25 is inserted into the calibration transmitter 27, meanwhile, the synchronous pulse distribution unit in the main control unit 7501 gives out synchronous pulses, and the internal DDS sub-unit gives out a sine wave signal s under pulse synchronization r ＝A r e -jw Wherein A is r Is a signal s r W is the signal s r The signal is applied to the signal driving channel II 7503 via the high-speed multi-branch electronic selection switch M1 7502, the signal is applied to the reciprocal acoustic transducer G2 2508 via the high-speed multi-branch electronic switch M2 7505, the reciprocal acoustic transducer G2 2508 is pushed to produce sound, a sound wave is radiated, the sound wave is received by a calibrated microphone 27 at a distance r/2 from the reciprocal acoustic transducer G2 2508, the signal is passed through the high-speed multi-branch electronic selection switch M37509 to the calibration data test channel 7512, the signal becomes:
obtaining the following components: a. The 05 ＝A r A q2 A tr2 A n1 A j ，θ 05 ＝θ q2 +θ tr2 +θ n1 +θ j To, for
Synchronous sampling N 3 An integer period signal which is calculated and corrected by a one-dimensional mixed FFT calculation subunit and a spectrum energy gravity center method correction subunit in the main control unit 7501 to obtain a signal (or signal) with a frequency of w>
Amplitude A of 05 And phase theta 05 Above formula B q2 (jw) frequency response function of Signal drive channel II 7503, A q2 Is B q2 Magnitude of (jw), θ q2 Is B q2 (jw) phase delay angle, B j (jw) is the frequency response function of the calibration data test channel 7512, A j Is B j Magnitude of (jw), θ j Is B j (jw) phase delay angle, B tr2 (jw) is the reciprocal acoustic transduction G2 2508 transmit frequency response function, A tr2 Is B tr2 Magnitude of (jw), θ tr2 Is B tr2 (jw) phase delay angle, B n1 (w) is a function of the receive frequency response of the calibration microphone 27, A n1 Is B n1 (w) amplitude, θ n1 Is B n1 (w) a phase delay angle.
(g3) The synchronous pulse distribution subunit in the main control unit 7501 gives out synchronous pulse, the internal DDS subunit gives out a sine wave signal s under the pulse synchronization r ＝A r e -jw Wherein A is r Is a signal s r W is the signal s r The signal passes through a high-speed multi-branch electronic selection switch M1 7502,the signal is applied to a signal driving channel I7504, the signal is applied to a reciprocal acoustic transducer G1 2505 through a high-speed multi-branch electronic selection switch M2 7505, the reciprocal acoustic transducer G1 2505 is pushed to generate sound, a sound wave is radiated, the sound wave is received by a reciprocal acoustic transducer G2 2508 which is at a distance r from the reciprocal acoustic transducer G1 2505, the signal is applied to a data testing channel through a high-speed multi-branch electronic selection switch M3 7509, and the signal becomes:
obtaining the following components: a. The 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 To, for
Synchronous sampling N 3 An integer period signal which is calculated and corrected by a one-dimensional mixed FFT calculation subunit and a spectrum energy gravity center method correction subunit in the main control unit 7501 to obtain a signal (or signal) with a frequency of w>
Amplitude A 06 And phase theta 06 Of the above formula B q1 (jw) frequency response function of Signal drive channel I7504, A q1 Is B q1 Magnitude of (jw), θ q1 Is B q1 (jw) phase delay angle, B j (jw) is the frequency response function of the calibration data test channel 7512, A j Is B j Magnitude of (jw), θ j Is B j (jw) phase delay angle, B tr1 (jw) is the reciprocal acoustic transduction G1 2505 transmit frequency response function, A tr1 Is B tr1 Magnitude of (jw), θ tr1 Is B tr1 (jw) phase delay angle, B tr2 (jw) is a reciprocal acoustic transduction G2 (2508) transmit frequency response function, A tr2 Is B tr2 Magnitude of (jw), θ tr2 Is B tr2 (jw) phase retardation Angle, B' tr2 (jw) Receiving a frequency response function, ρ, for reciprocal acoustic transduction G2 (2508) 0 Is the air density, f is the frequency of the acoustic wave, 2 r/rho 0 f is a reciprocal parameter of the spherical free sound field, and the parameter of other free sound fields needs to be properly corrected, so that other types of free sound fields can be used as test sound sources. />
(g4) From A 01 ，A 02 ，A 03 ，A 04 ，A 05 ，A 06 ，A r Finding A tr1 ，A tr2 ，A n1 ：
The single frequency amplitude and phase test signal loading step of the single data test channel to be tested comprises the following process control procedures: an incoming parameter N 3 Then, the loading calculation of the signal is carried out, namely: the synchronous pulse distributing subunit in the main control unit 7501 gives out synchronous pulse, the internal DDS unit gives out a sine wave signal s under the pulse synchronization r ＝A r e -jw Wherein A is r Is a signal s r W is the signal s r Is applied to the signal drive channel I7504 via the high-speed multi-branch electronic selection switch M1 (7502), and is passed highSpeed multi-branch electronic selection switch M2 7505 directly added to mth 1 On way data test channel 7511, the signal becomes:
The single frequency amplitude sensitivity and phase test number loading step of the single microphone to be tested comprises the following process control procedures: an incoming parameter N 3 Then, the loading calculation of the signal is carried out, namely: the microphone aligning mechanism I25 inserts the microphone insertion port I2503 of the microphone aligning mechanism I25 into the mth microphone in conjunction with the microphone array vertical motion control mechanism IV and the microphone array lateral motion control mechanism V 1 The microphone is connected with the main control unit 7501, the synchronous pulse distribution unit in the main control unit gives synchronous pulse, the internal DDS unit gives a sine wave signal s under pulse synchronization r ＝A r e -jw Wherein A is r Is a signal s r W is the signal s r The signal is applied to a signal driving channel I7504 through a high-speed multi-branch electronic selection switch M1 7502, then applied to the reciprocal acoustic transducer G1 2505 through a high-speed multi-branch electronic selection switch M2 7505, and pushed to sound the reciprocal acoustic transducer G1 2505, and a sound wave is radiated, and the sound wave is radiated by the M-th acoustic transducer with a distance r/2 from the reciprocal acoustic transducer G1 2505 1 The signals are received by a single-path microphone, and are added to the mth path through a high-speed multi-path electronic selection switch M3 7509 1 On way data test channel 7511, the signal becomes:
obtaining the following components:
synchronously sampling s by N 3 An integer periodic signal, which is calculated and corrected by one or two-dimensional mixed FFT calculation and correction unit of main control unit 7501 to obtain a signal with frequency w
Amplitude->
And phase->
Output amplitude value->
And phase->
The energy center-of-gravity method spectrum correction method comprises
Δ w to frequency correction, based on the correction>
Correction of the amplitude is carried out, wherein>
M is typically 1 or 2,X k Is a complex spectrum of K positions in a fast Fourier transform intermediate frequency spectrogram, K t To the energy recovery factor, K t The selection of (1) is generally related to the selection of the window function, and the Hanning window is generally 8/3./>
Claims (4)
1. A free sound field small-sized acoustic holographic measurement and inversion device is characterized by comprising a whole device supporting and adjusting mechanism I, a microphone array longitudinal motion control mechanism II, a microphone array rotary motion control mechanism III, a microphone array vertical motion control mechanism IV, a microphone array transverse motion control mechanism V, a microphone correction control mechanism VI and a virtual ball setting reference position positioning measurement column VII; the whole device supporting and adjusting mechanism I comprises an adjusting support I (1), an adjusting support II (2) and an adjusting support III (3), wherein the three adjusting supports are respectively connected with screw holes in a base plate (4) through respective screw rod motors, a fixed counterweight round table (5) is arranged on the base plate (4), the fixed counterweight round table (5) is fixed on the base plate (4), a horizontal position sensor K1 (6) and a horizontal position sensor K2 (7) are also arranged on the base plate (4), the upper surface of the fixed counterweight round table (5) is connected with a vertical support rod (8), the upper end of the vertical support rod (8) is connected with a longitudinal and rotary motion assembly mounting platform (12), a laser receiver (11) is also arranged at the upper end of the vertical support rod (8), and an electric appliance box (9) and a miniature liquid crystal display touch screen (10) are arranged on the side surface of the longitudinal and rotary motion assembly mounting platform (12); the microphone array rotary motion control mechanism III comprises a first stepping motor D1 (14) and a second stepping motor D2 (15) which are arranged below a longitudinal and rotary motion component mounting platform (12), wherein the first stepping motor D1 (14) is connected with one gear of a special-shaped gear pair I (13) arranged on the longitudinal and rotary motion component mounting platform (12) through a bearing, the second stepping motor D2 (15) is connected with the other gear of the special-shaped gear pair I (13) through a bearing, and the special-shaped gear pair I (13) is respectively connected with a longitudinal motion component S1 (16) and a longitudinal motion component S2 (17) of the longitudinal motion control mechanism II through a mechanical connecting component (24) arranged on the longitudinal and rotary motion component mounting platform (12); the microphone array longitudinal motion control mechanism II comprises a longitudinal motion component S1 (16) and a longitudinal motion component S2 (17), which are respectively connected with a special-shaped gear pair I (13) through a mechanical connection component (24), the longitudinal motion component S1 (16) is also connected with a rack G3 (1801) of a rigid motion component S1 (18) through a screw rod sleeve I (1606), and the longitudinal motion component S2 (17) is also connected with a rack G4 (1901) of the rigid motion component S2 (19) through a screw rod sleeve II (1706); the microphone array vertical motion control mechanism IV comprises a vertical motion component S1 (18) and a vertical motion component S2 (19), wherein the vertical motion component S1 (18) is connected with a substrate T2 (2101) of a microphone array main mounting arm S2 (21) of a microphone array transverse motion control mechanism V through a screw rod sleeve III (1806), and the vertical motion component S2 (19) is connected with a substrate T1 (2001) of a microphone array main mounting arm S1 (20) of the microphone array transverse motion control mechanism V through a screw rod sleeve IV (1906); the microphone array transverse 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), wherein 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), and the microphones (23) are mounted on the microphone array sub-mounting arms (22); the microphone correction control mechanism VI comprises a microphone correction mechanism I (25) and a microphone correction mechanism II (26), wherein the microphone correction mechanism I (25) and the microphone correction mechanism II (26) are respectively fixed on the vertical movement component S2 (19) and the vertical movement component S1 (18); the adjusting support I (1) comprises a screw rod motor M1 (102) and a base I (101), the screw rod motor M1 (102) is arranged in the base I (101), the adjusting support II (2) comprises a screw rod motor M2 (202) and a base II (201), the screw rod motor M2 (202) is arranged in the base II (201), the adjusting support III (3) comprises a screw rod motor M3 (302) and a base III (301), and the screw rod motor M3 (302) is arranged in the base III (301); the longitudinal movement assembly S1 (16) comprises a rack 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 step motor D3 (1604), wherein a sliding groove II (1609) is formed in the inner surface of one of two longitudinal plates of the rack G1 (1601), a sliding groove I (1608) is formed in the inner surface of the other one of the two transverse plates of the rack G1 (1601), the bearing S2 (1607) is fixed on one of the two transverse plates of the rack G1 (1601), the bearing S2 (1607) is connected with one end of the screw I (1605), the bearing S1 (1602) is fixed on the other transverse plate of the rack G1 (1601), the bearing S1 (1602) is connected with the other end of the screw I (1605), the screw I (1605) penetrates through the bearing S1 (1602) and is connected with one gear of the gear pair II (1603), the other gear of the gear pair II (1603) is connected with the third step motor D3 (1608), the screw sleeve I (1605) is sleeved on the sliding groove I (1605), and the sliding groove I (1605) is arranged on the sliding groove I (1605) respectively; the longitudinal motion assembly S2 (17) comprises a rack G2 (1701), a bearing S3 (1702), a screw II (1705), a screw sleeve II (1706), a bearing S4 (1707), a gear pair III (1703) and a fourth stepping motor D4 (1704), wherein the inner surface of one of two longitudinal plates of the rack G2 (1701) is provided with a chute IV (1709), the inner surface of the other longitudinal plate is provided with a chute III (1708), the bearing S4 (1707) is fixed on one of two transverse plates of the rack G2 (1701), the bearing S4 (1707) is connected with one end of the screw II (1705), the other transverse plate of the rack G2 (1701) is fixed with the bearing S3 (1702), the bearing S3 (1702) is connected with the other end of the screw II (1705), the screw II (1705) passes through the bearing S3 (1702) to be connected with one gear of the gear pair III (1703), the other gear of the gear pair III (1703) is connected with the fourth stepping motor D4 (1704), the screw sleeve II (1706) is sleeved on the chute 1705, the screw sleeve 1705 II (1705) is respectively arranged on a transverse rod IV (1708) of the screw II, and the screw sleeve (1708); the vertical motion assembly S1 (18) comprises a rack G3 (1801), a bearing S5 (1802), a screw rod III (1805), a screw rod sleeve III (1806), a bearing S6 (1807), a gear pair IV (1803) and a fifth stepping motor D5 (1804), wherein one of two longitudinal plates of the rack G3 (1801) is provided with a chute VI (1809) on the inner surface, the other plate is provided with a chute V (1808) on the inner surface, the bearing S6 (1807) is fixed on one of the two transverse plates of the rack G3 (1801), the bearing S6 (1807) is connected with one end of the screw rod III (1805), the other transverse plate of the rack G3 (1801) is fixed with the bearing S5 (1802), the bearing S5 (1802) is connected with the other end of the screw rod III (1805), the screw rod III (1805) passes through the bearing S5 (1802) and is connected with one of the gear pair IV (1803), the other gear of the gear pair IV (1803) is connected with the fifth stepping motor D5 (1805), the chute sleeve III (1806) is sleeved on the chute V (1808), and the chute (1808) is respectively arranged on the screw rod V (1805); vertical motion subassembly S2 (19) including frame G4 (1901), bearing S7 (1902), lead screw IV (1905), lead screw cover IV (1906), bearing S8 (1907), gear pair V (1903), sixth step motor D6 (1904), one of them inboard surface is equipped with spout VIII (1909) in frame G4 (1901) two vertical boards, another piece internal surface is equipped with spout VII (1908), bearing S8 (1907) are fixed on one of them board in the horizontal two boards of frame G4 (1901), bearing S8 (1907) link to each other with lead screw IV (1905) one end, be fixed with bearing S7 (1905) on the horizontal another board of frame G4 (1901), bearing S7 (1902) link to each other with lead screw IV (1905) other end, and lead screw IV (1905) pass bearing S7 (1902) and gear pair V (1903) one of them gear links to each other, another gear links to each other with sixth step motor D6 (1904) in gear pair V (1903), the lead screw cover IV (1906) is continuous with horizontal spout IV (1908) pole on lead screw cover (1908) respectively, lead screw cover IV (1908) the horizontal spout (1909).
2. The small-scale acoustic holography measurement and inversion device of a free sound field according to claim 1, wherein the microphone array main mounting arm S1 (20) comprises a base T1 (2001), one end of the base T1 (2001) is provided with a bearing S10 (2005), the other end is provided with a bearing S9 (2002), the middle of the base T1 (2001) is hollow, a gear rod I (2007) is mounted, two ends of the gear rod I (2007) are respectively fixed on the bearing S10 (2005) and the bearing S9 (2002), one surface of the base T1 (2007) is provided with a stepping motor D7 (2003), the stepping motor D7 (2003) is fixed on the base T1 (2001), a seventh stepping motor D7 (2003) is provided with a gear W1 (2004) on a shaft, the gear W1 (2004) is meshed with the gear rod I (2007) through a notch I (2006), the other surface of the base T1 (2001) is provided with a plurality of open grooves for mounting the microphone array sub-mounting arm (22), and a calibration microphone I (27) is further arranged at the upper end of the base T1 (2001); the microphone array main mounting arm S2 (21) comprises a base body T2 (2101), one end of the base body T2 (2101) is provided with a bearing S12 (2105), the other end of the base body T2 (2101) is provided with a bearing S11 (2102), the middle of the base body T2 (2101) is hollow, a gear rod II (2107) is mounted, two ends of the gear rod II (2107) are respectively fixed on the bearing S12 (2105) and the bearing S11 (2102), one side of the base body T2 (2101) is provided with an eighth stepping motor D8 (2103), the eighth stepping motor D8 (2103) is fixed on the base body T2 (2101), a gear W2 (2104) is mounted on a shaft of the eighth stepping motor D8 (2103), the gear W2 (2104) is meshed with the gear rod II (2107) through a notch II (2106), the other side of the base body T2 (2101) is provided with a plurality of open slots for mounting the microphone array sub-mounting arm (22), and the calibration microphone II (28) is further arranged at the upper end of the base body T1 (2101); the microphone array sub-mounting arm (22) comprises a substrate (2202), racks (2201) are arranged on two sides of the back surface of the substrate (2202), a plurality of microphone insertion bases (2203) are arranged on the front surface of the substrate, and the microphone (23) is inserted into the microphone insertion bases (2203).
3. The small-sized acoustic holography, measurement and inversion device of a free sound field as claimed in claim 1, wherein said microphone calibration control mechanism I (25) comprises a ninth stepping motor D9 (2501), a sleeve I (2502), a microphone insertion port I (2503), a micro-sound-absorbing cavity I (2504), a reciprocal acoustic transducer G1 (2505), a spring I (2506), a connecting member L1 (2507), a reciprocal acoustic transducer G2 (2508), an electromagnet P1 (2509), a double-sliding-slot C1 (2510), a solenoid U1 (2511), the ninth stepping motor D9 (2501) is fixed on a frame G4 (1901) of the vertical motion assembly S2 (19), the ninth stepping motor D9 (2501) is connected with one end of the connecting member L1 (2507) through a screw rod, the other end of the connecting member L1 (2507) is connected with the sleeve I (2502), a cylindrical half-through hole is arranged in the sleeve I (2502), a double-sliding-slot C1 (0) is arranged in the hole, and connected with the micro-sound-absorbing cavity I (2504) of the electromagnet (2501), a sound-absorbing rod (2509) is arranged on the other end of the electromagnetic transducer G1, and the electromagnetic transducer (2501), the other end of the electromagnetic transducer (2501) is arranged on the spring (2501), the electromagnetic transducer (2506), in addition, a microphone insertion opening I (2503) is arranged in the middle of the micro silencing cavity I (2504); the microphone calibration control mechanism II (26) comprises a tenth stepping motor D10 (2601), a sleeve II (2602), a microphone insertion hole II (2603), a miniature muffling cavity II (2604), a reciprocal acoustic transducer G3 (2605), a spring II (2606), a connecting piece L2 (2607), a reciprocal acoustic transducer G4 (2608), an electromagnet P2 (2609), a double-sliding-groove C2 (2610) and an electromagnetic coil U2 (2611), wherein the tenth stepping motor D10 (2601) is fixed on a rack G3 (1801) of a vertical motion assembly S1 (18), the tenth stepping motor D10 (2601) is connected with one end of the connecting piece L2 (2607) through a screw rod, the other end of the connecting piece L2 (2607) is connected with the sleeve II (2602), a cylindrical semi-through hole is arranged inside the sleeve II (2602), the double-sliding-groove C2 (2610) and the electromagnet P2 (2609) are arranged in the hole, an ear rod of the P2 (2609) is placed on the double-sliding-groove C2 (2610), meanwhile, 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 is connected with a micro-anechoic cavity II (2604), one end in the micro-anechoic cavity II (2604) is provided with a reciprocal acoustic transducer G3 (2605), the other end is provided with a reciprocal acoustic transducer G4 (2608), in addition, the middle part of the micro-anechoic cavity II (2604) is provided with a microphone insertion opening II (2603).
4. The compact acoustic holography measurement and inversion device for free sound field according to claim 1, wherein said virtual sphere setting reference position measurement column VI comprises a support (29), said support (29) is connected to a vertical rod (30), the upper end of said vertical rod (30) is provided with a laser transmitter (31), and the upper end is provided with a microphone socket (32).
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