CN110026330B - Piston sounding device, probe calibration device and method for calibrating probe - Google Patents
Piston sounding device, probe calibration device and method for calibrating probe Download PDFInfo
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- CN110026330B CN110026330B CN201910338580.8A CN201910338580A CN110026330B CN 110026330 B CN110026330 B CN 110026330B CN 201910338580 A CN201910338580 A CN 201910338580A CN 110026330 B CN110026330 B CN 110026330B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/10—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of mechanical energy
- B06B1/16—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of mechanical energy operating with systems involving rotary unbalanced masses
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
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- Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The invention provides a piston sounding device, a probe calibration device and a method for calibrating a probe by using the same, and belongs to the technical field of sound wave generation. The piston sounding device comprises a controller, a cavity with a port, a first driving assembly, a second driving assembly, a lever, a supporting rod and a piston; the piston is arranged at the port of the cavity to seal the cavity, two ends of the lever are respectively in transmission connection with the piston and the first driving assembly, one end of the supporting rod is abutted against the lever, the other end of the supporting rod is in transmission connection with the second driving assembly, and the controller is respectively in signal connection with the first driving assembly and the second driving assembly; the first driving component drives one end of the lever, which is connected with the first driving component, to do simple harmonic motion along the butt joint end of the supporting rod, the other end of the lever drives the piston to do simple harmonic vibration along the axial direction of the cavity, and the second driving component drives the supporting rod to move along the extending direction of the lever.
Description
Technical Field
The invention relates to the technical field of sound wave generation, in particular to a piston sounding device, a probe calibration device and a method for calibrating a probe.
Background
During acoustic research and applications, it is often necessary to accurately measure acoustic waves with acoustic measurement devices. In the conventional acoustic measurement apparatus, a microphone (acoustic-electric converter) for converting a sound pressure signal into an electric signal is provided. In practical applications, in order to make the electrical signal converted and output by the microphone have high accuracy, the calibration of the microphone is usually performed irregularly.
In calibrating a microphone, it is often necessary to use a piston sound generator (or infrasound generator) to generate sound pressure of known frequency and amplitude for calibration purposes. The piston sound production device can generate sound pressure in a triangular waveform in the cavity through the reciprocating piston, namely, low-frequency sound waves with certain frequency and amplitude are generated. The sound pressure is detected by a microphone, and the microphone can be calibrated by comparing the parameters of the detection signal and the original sound pressure.
The piston sound production device at present generally drives a piston to do reciprocating motion through a vibrating table, an electromagnetic vibration exciter or a cam, but the vibrating table and the electromagnetic vibration exciter are high in manufacturing cost and difficult to maintain, and the piston sound production device of the existing cam driving structure is low in cost and convenient to maintain, but cannot produce sound pressure with different amplitudes.
Disclosure of Invention
The invention aims to provide a piston sounding device, a probe calibration device and a method for calibrating a probe of the piston sounding device.
The embodiment of the invention is realized by the following steps:
in one aspect of the embodiments of the present invention, there is provided a piston sound generating apparatus including: the device comprises a controller, a cavity with a port, a first driving assembly, a second driving assembly, a lever, a supporting rod and a piston; the piston is arranged at the port of the cavity to seal the cavity, two ends of the lever are respectively in transmission connection with the piston and the first driving assembly, one end of the supporting rod is abutted against the lever, the other end of the supporting rod is in transmission connection with the second driving assembly, and the controller is respectively in signal connection with the first driving assembly and the second driving assembly; the first driving component drives one end of the lever, which is connected with the first driving component, to do simple harmonic motion along the butt joint end of the supporting rod, the other end of the lever drives the piston to do simple harmonic vibration along the axial direction of the cavity, and the second driving component drives the supporting rod to move along the extending direction of the lever.
Optionally, a spring is sleeved on the piston, and two ends of the spring respectively abut against the port of the cavity and one end of the piston connecting lever.
Optionally, the second driving assembly comprises a driving motor, a lead screw and a lead screw nut, the driving motor is in transmission connection with the lead screw, the lead screw nut is sleeved on the lead screw, and the lead screw nut is connected with one end of the support rod, which is far away from the lever; the extending direction of the lead screw is parallel to the extending direction of the lever, and the driving motor is in signal connection with the controller.
Optionally, a fulcrum bearing or a fulcrum roller is arranged at one end of the support rod, which is abutted against the lever, the fulcrum bearing or the fulcrum roller is rotatably connected with the support rod, and the fulcrum bearing or the fulcrum roller can roll on the lever; the bracing piece includes first screw rod, second screw rod and sleeve, and telescopic one end cup joints with first screw rod, and telescopic other end cup joints with the second screw rod, and pivot bearing or pivot gyro wheel setting keep away from telescopic one end at the second screw rod.
Optionally, the first driving assembly comprises a rotating motor, a cam and a connecting rod, the rotating motor is in transmission connection with the cam, the lever is connected with one end of the connecting rod, the other end of the connecting rod is abutted against the cam, and the rotating motor is in signal connection with the controller.
Optionally, the port of the cavity comprises a taper; one side of the cavity far away from the port is provided with an electromagnetic valve which is in signal connection with the controller.
In another aspect of the embodiments of the present invention, there is provided a probe calibration apparatus, including: the device comprises a standard probe, a tested probe mounting port, a processor and a plurality of piston sounding devices of any one of the standard probe, the tested probe mounting port and the processor; the standard probe and the installation port of the detected probe are arranged on the cavity of the piston sounding device, the standard probe is connected with the processor, and the installation port of the detected probe is used for installing the detected probe connected with the processor.
Optionally, a lever of the piston sounding device is provided with a sound pressure amplitude calibration scale; the processor is connected with the controller of the piston sounding device; a displacement sensor is arranged on a piston of the piston sounding device, and the displacement sensor is connected with the processor and used for sensing the displacement of the piston; the processor of the piston sounding device comprises a computer and a data acquisition card, the data acquisition card is respectively connected with the computer, the standard probe, the detected probe and the displacement sensor, and the computer is connected with the controller.
In a further aspect of the invention, there is provided a method of calibrating a probe using the probe calibration device of any one of the above, comprising: receiving detection data of a standard probe; receiving detection data of a detected probe; comparing the detection data of the standard probe with the detection data of the detected probe; and calibrating the measured value of the tested probe according to the comparison result.
In another aspect of the present invention, there is provided a method for calibrating a probe by using the above probe calibration apparatus including a sound pressure amplitude calibration scale, including: receiving detection data of a detected probe; reading the numerical value of the sound pressure amplitude calibration scale on the support rod corresponding to the lever; comparing the value of the sound pressure amplitude calibration scale with the detection data of the detected probe; and calibrating the measured value of the tested probe according to the comparison result.
The embodiment of the invention has the beneficial effects that:
the piston sound production device provided by the embodiment of the invention comprises a controller, a cavity, a first driving assembly, a second driving assembly, a lever, a supporting rod and a piston. The controller is in signal connection with the first driving assembly and the second driving assembly respectively, and the first driving assembly can be controlled to drive the lever to do simple harmonic motion and the second driving assembly can be controlled to drive the supporting rod to move along the extending direction of the lever through the controller respectively. The piston is slidably disposed within the chamber through a port of the chamber. Because the both ends of lever are connected with piston and the transmission of first drive assembly respectively, consequently, the piston can be under the drive of first drive assembly and do simple harmonic vibration along with the tip of lever in the cavity. And one end of the supporting rod is abutted to the lever and is used as a fulcrum of the lever, the second driving component drives the supporting rod to move along the extending direction of the lever, so that the fulcrum of the lever can move under the driving of the second driving component, the amplitude of the simple harmonic motion of the end part of the lever connected with the piston changes along with the change of the fulcrum, and further the amplitude of the simple harmonic vibration of the piston changes along with the change of the fulcrum of the lever. The pistons with different vibration amplitudes can drive the gas in the cavity to generate sound pressure with different amplitudes. Therefore, the piston sound production device can change the amplitude of the simple harmonic vibration of the piston by changing the position of the fulcrum of the lever, so that sound pressure with different amplitudes is generated in the cavity. Meanwhile, the frequency of the simple harmonic vibration of the piston can be changed by adjusting the frequency of the simple harmonic motion of the first driving assembly driving lever, so that sound pressure with different frequencies is generated. Because the piston sound production device adopts a structure combining the driving assembly and the lever, and does not adopt a vibration table or an electromagnetic vibration exciter, the cost is relatively low, and the piston sound production device is convenient to maintain.
According to the probe calibration device provided by the embodiment of the invention, the piston sounding device is low in cost and convenient to maintain, and can generate sound pressure with different amplitudes and frequencies. The probe calibration device can calibrate the detected probe more accurately by comparing the data of the standard probe and the detected probe.
The method for calibrating the probe by adopting the probe calibration device provided by the invention can be used for more accurately calibrating the probe to be detected.
The method for calibrating the probe by using the probe calibration device comprising the sound pressure amplitude calibration dividing ruler can calibrate the detected probe more conveniently and quickly.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a piston sound generating device according to an embodiment of the present invention;
fig. 2 is a second schematic structural diagram of a piston sound generating device according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a probe calibration device according to an embodiment of the present invention;
fig. 4 is a flowchart of a method for calibrating a probe of the probe calibration device according to an embodiment of the present invention.
Icon: 110-a controller; 120-a cavity; 121-a taper; 130-a first drive assembly; 131-a rotating electrical machine; 132-a cam; 133-connecting rod; 140-a second drive assembly; 141-a drive motor; 142-a lead screw; 143-lead screw nut; 150-lever; 160-a support bar; 161-a first screw; 162-a second screw; 163-a sleeve; 170-a piston; 180-a spring; 190-electromagnetic valve; 310-standard probe; 320-a detected probe; 330-a processor; 331-a computer; 332-data acquisition card; 340-displacement sensor.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
An embodiment of the present invention provides a piston sound generating apparatus, as shown in fig. 1, including: a controller 110, a chamber 120, a first driving assembly 130, a second driving assembly 140, a lever 150, a support rod 160, and a piston 170; the piston 170 is arranged at the port of the cavity 120 to seal the cavity 120, two ends of the lever 150 are respectively in transmission connection with the piston 170 and the first driving assembly 130, one end of the supporting rod 160 is abutted against the lever 150, the other end of the supporting rod is in transmission connection with the second driving assembly 140, and the controller 110 is respectively in signal connection with the first driving assembly 130 and the second driving assembly 140; the first driving component 130 drives one end of the lever 150 connected with the first driving component 130 to make simple harmonic motion along the abutting end of the supporting rod 160, the other end of the lever 150 drives the piston 170 to make simple harmonic vibration along the axial direction of the cavity 120, and the second driving component 140 drives the supporting rod 160 to move along the extending direction of the lever 150.
In practical applications, the first driving assembly 130 for driving the lever 150 to perform a simple harmonic motion along the fulcrum may be generally configured as a linear motor, a crank mechanism, or the like, which drives the lever to perform a simple harmonic vibration. The second driving assembly 140 for driving the supporting rod 160 to move along the extending direction of the lever 150 may be generally configured as a linear motor, an air cylinder, or a combination mechanism of a rotary motor and a lead screw, etc.
When the first driving assembly 130 and the second driving assembly 140 are both provided as linear motors, the support bar 160 and the lever 150 are respectively connected to driving bars of the corresponding linear motors (not shown in the drawings).
When the first driving assembly 130 is configured as a crank mechanism, the crank mechanism includes a rotating motor, a crank and a connecting rod, the crank is driven by the rotating motor, and the end of the lever 150 is in transmission with the crank through the connecting rod. Under the driving of the rotating motor, the crank rotates at a certain rotation speed, and the rotating crank drives the lever 150 to perform simple harmonic motion (simple harmonic oscillation) along the fulcrum through the connecting rod. (not shown in the drawings)
Of course, in the embodiment of the present invention, the first driving assembly 130 and the second driving assembly 140 may be configured in other specific structures, which are not limited herein, as long as the first driving assembly 130 can drive the lever 150 to make simple harmonic motion along the fulcrum, and the second driving assembly 140 can drive the supporting rod 160 to move along the extending direction of the lever 150.
First, it should be understood by those skilled in the art that the simple harmonic motion of the lever 150 refers to the reciprocal oscillation of the lever 150 with the abutting portion of the supporting rod 160 as a fulcrum, and the curve of the displacement of the reciprocal oscillation with time is a sine curve or a cosine curve.
Second, those skilled in the art will appreciate that the piston 170 and the chamber 120 need to be in a sealing fit, and the piston 170, which is driven by the lever 150 to vibrate in a simple harmonic manner, can generate sound pressure with stable waveform and high accuracy in the chamber 120.
Third, the connection of the lever 150 to the first driving assembly 130 and the piston 170, respectively, is configured to articulate, typically to enable smooth transmission of both the first driving assembly 130 and the piston 170 to the lever 150. Of course, in practical applications, the above connection may be implemented in other manners.
The piston sound-producing device provided by the embodiment of the invention comprises a controller 110, a cavity 120, a first driving assembly 130, a second driving assembly 140, a lever 150, a supporting rod 160 and a piston 170. The controller 110 is in signal connection with the first driving assembly 130 and the second driving assembly 140, and the controller 110 can control the first driving assembly 130 to drive the lever 150 to make simple harmonic motion and the second driving assembly 140 to drive the supporting rod 160 to move along the extending direction of the lever 150. A piston 170 is slidably disposed within the chamber 120 through a port of the chamber 120. Since the two ends of the lever 150 are respectively in transmission connection with the piston 170 and the first driving assembly 130, the piston 170 can vibrate in the cavity 120 in a simple harmonic manner along with the end of the lever 150 under the driving of the first driving assembly 130. Since one end of the supporting rod 160 is abutted against the lever 150, the supporting rod 160 is driven by the second driving assembly 140 to move along the extending direction of the lever 150 as the fulcrum of the lever 150, so that the fulcrum of the lever 150 can move under the driving of the second driving assembly 140, the amplitude of the simple harmonic motion of the end part of the lever 150 connected with the piston 170 is changed along with the change of the fulcrum, and further the amplitude of the simple harmonic vibration of the piston 170 is changed along with the change of the fulcrum of the lever 150. The pistons 170 with different vibration amplitudes can drive the gas in the cavity 120 to generate sound pressures with different amplitudes in the cavity 120. Therefore, the piston sound generating apparatus can change the amplitude of the simple harmonic vibration of the piston 170 by changing the fulcrum position of the lever 150, thereby generating sound pressure of different amplitudes in the cavity 120. Meanwhile, by adjusting the frequency of the simple harmonic motion of the lever 150 driven by the first driving assembly 130, the frequency of the simple harmonic vibration of the piston 170 can be changed, thereby generating sound pressure of different frequencies. Because the piston sound-generating device adopts a structure that the driving assembly is combined with the lever 150, and a vibration table or an electromagnetic vibration exciter is not adopted, the cost is relatively low, and the piston sound-generating device is convenient to maintain.
Optionally, as shown in fig. 1, a spring 180 is sleeved on the piston 170, and two ends of the spring 180 abut against the port of the cavity 120 and one end of the piston 170 connected to the lever 150, respectively.
In order to enable the spring 180 to abut against the end of the piston 170 connected to the lever 150, an end cap or the like is provided to provide an abutting part for the spring 180. Of course, the abutting portion may not be additionally provided in the embodiment of the present invention.
The piston 170 is sleeved with the spring 180, the spring 180 can assist the piston 170 to vibrate in simple harmonic mode under the driving of the lever 150, and meanwhile, the lever 150 can keep tight abutting connection with the supporting rod 160 in the working process through the elastic force of the spring 180, so that the working stability and precision of the piston sound-generating device are improved.
Optionally, as shown in fig. 1, the second driving assembly 140 includes a driving motor 141, a lead screw 142, and a lead screw nut 143, the driving motor 141 is in transmission connection with the lead screw 142, the lead screw nut 143 is sleeved on the lead screw 142, and the lead screw nut 143 is connected with one end of the support rod 160 away from the lever 150; the extending direction of the lead screw 142 is parallel to the extending direction of the lever 150, and the driving motor 141 is in signal connection with the controller 110.
In the operation process of the second driving assembly 140, the driving motor 141 drives the lead screw 142 to rotate, so that the lead screw nut 143 can move on the lead screw 142 along the extending direction of the lead screw 142, and further drives the supporting rod 160 connected to the lead screw nut 143 to move, so that the position where the supporting rod 160 abuts against the lever 150 moves along the extending direction of the lever 150 (i.e., the fulcrum of the lever 150 moves along the extending direction of the lever 150).
It should be noted that, in practical applications, a person skilled in the art may select the driving motor 141 according to specific operating conditions or design parameters. For example, a rotary electric machine or the like is used.
The first driving assembly 130 is provided with a structure of combining the driving motor 141 and the lead screw 142, so that the cost is low, and the structure is simple and convenient to maintain. The precision of the matching between the screw 142 and the screw nut 143 is relatively high, so that the precision is high by changing the fulcrum of the lever 150 through the structure, and the precision of the piston sound generating device can be improved.
Optionally, as shown in fig. 1, one end of the supporting rod 160 abutting against the lever 150 is provided with a fulcrum bearing or a fulcrum roller (not labeled in fig. 1), both the fulcrum bearing and the fulcrum roller are rotatably connected to the supporting rod 160, and both the fulcrum bearing and the fulcrum roller can roll on the lever 150.
The supporting bearing or the fulcrum roller is arranged at one end, abutted against the lever 150, of the supporting rod 160, and is abutted against the lever 150 through the supporting bearing or the fulcrum roller, so that the resistance of the supporting rod 160 in moving can be reduced by rolling of the supporting bearing or the fulcrum roller on the lever 150, and the influence of the resistance on the lever 150 in moving of the fulcrum position is reduced, the moving precision of the fulcrum position of the lever 150 is improved, and the precision of the piston sound generating device is improved.
Optionally, as shown in fig. 2, the support rod 160 includes a first screw 161, a second screw 162, and a sleeve 163, one end of the sleeve 163 is sleeved with the first screw 161, the other end of the sleeve 163 is sleeved with the second screw 162, and one end of the second screw 162 away from the sleeve 163 is provided with a fulcrum bearing or a fulcrum roller.
The supporting rod 160 is provided with a first screw 161, a second screw 162 and a sleeve 163, and the sleeve 163 can be adjusted and rotated, so that the first screw 161 and the second screw 162 connected to the two ends of the sleeve 163 can move towards or away from each other, thereby changing the length of the whole structure of the supporting rod 160, and enabling the abutting between the supporting rod 160 and the lever 150 to be released or strengthened. By adjusting the length of the support rod 160 to release the contact between the support rod 160 and the lever 150, it is possible to prevent the spring 180 from being compressed for a long time and becoming invalid when the piston sound generating apparatus stops operating. Of course, in practical applications, in order to adjust the length of the supporting rod 160, the supporting rod 160 may be configured to be other retractable structures, for example, a retractable rod.
Alternatively, as shown in fig. 1, the first driving assembly 130 comprises a rotating motor 131, a cam 132 and a connecting rod 133, the rotating motor 131 is in transmission connection with the cam 132, one end of the connecting rod 133 is connected with the lever 150, and the other end of the connecting rod 133 abuts against the profile of the cam 132, wherein the rotating motor 131 is in signal connection with the controller 110.
First, the profile curve of the cam 132 is set to be a sinusoidal acceleration type, that is, the cam 132 is set to be a sinusoidal acceleration cam 132.
Second, in order to make the transmission between the link 133 and the cam 132 smoother, a roller or the like is usually provided at the contact point of the link 133 and the cam 132. The abutting part of the connecting rod 133 and the cam 132 may be provided with a flat plate perpendicular to the connecting rod 133, and the flat plate may abut on the cam 132 to further smooth the transmission between the cam 132 and the connecting rod 133.
The first driving assembly 130 is provided with a structure comprising the rotating motor 131, the cam 132 and the connecting rod 133, so that the piston sound generating device is simple in structure, low in cost and convenient to maintain, and the cost of the piston sound generating device can be reduced.
Optionally, a sealing ring (not shown in the drawings) is fitted around the periphery of the piston 170.
The sealing ring is sleeved on the periphery of the piston 170, so that the piston 170 and the cavity 120 can have better sealing performance. Meanwhile, in order to reduce the wear of the piston 170 due to direct contact with the cavity 120 during movement, a guide ring (not shown) may be sleeved on the periphery of the piston 170 to prevent the piston 170 from directly contacting the cavity 120.
Optionally, as shown in fig. 1, the port of the cavity 120 includes a taper 121.
The port of the cavity 120 includes the tapered portion 121, so that when the sound pressure generated by the gas driven by the piston 170 at the port travels in a direction away from the piston 170, the sound pressure gas flow is prevented from generating a vortex, which causes a sound pressure non-uniformity error.
Optionally, as shown in fig. 1, a solenoid valve 190 is disposed on a side of the cavity 120 away from the port, and the solenoid valve 190 is in signal connection with the controller 110.
Because the gas in the cavity 120 leaks a small amount with the duration of time in the using process, the electromagnetic valve 190 can be opened to balance the air pressure between the inside of the cavity 120 and the outside when the gas needs to be supplemented to the cavity 120 in a mode of arranging the electromagnetic valve 190 on the wall. In practical applications, a person skilled in the art can select the installation position of the solenoid valve 190 according to working conditions and design conditions.
In another aspect of the embodiments of the present invention, there is provided a probe calibration apparatus, as shown in fig. 3, including: a reference probe 310, a probe mount to be tested, a processor 330, and any of a plurality of piston sound generators; the standard probe 310 and the tested probe mounting port are arranged on the cavity 120 of the piston sounding device, the standard probe 310 is connected with the processor 330, and the tested probe mounting port is used for mounting the tested probe 320 connected with the processor 330.
It should be noted that, firstly, since the acoustic pressure airflow generated in the cavity 120 is relatively uniform in the middle of the cavity 120, the standard probe 310 and the probe mounting port to be detected can be relatively disposed in the middle of the cavity 120. Of course, the specific arrangement positions of the standard probe 310 and the probe mounting port to be detected are not limited, and those skilled in the art can set the arrangement positions according to the circumstances.
Secondly, the standard probe 310 and the probe 320 are both used for detecting the waveform parameters of the sound pressure in the cavity 120, and converting the sound pressure signal into an electrical signal. The reference probe 310 and the measured probe 320 may be a reference microphone and a measured microphone, respectively, or may be other probes that can convert a sound pressure signal into an electrical signal.
According to the probe calibration device provided by the embodiment of the invention, the piston sounding device is low in cost and convenient to maintain, and can generate sound pressure with different amplitudes and frequencies. The probe calibration device can calibrate the detected probe 320 more accurately by comparing the data of the standard probe 310 and the detected probe 320.
Optionally, a sound pressure amplitude calibration scale (not shown in fig. 3) is provided on the lever 150 of the piston sound generating device.
The sound pressure amplitude calibration scale corresponds to the fulcrum position on the corresponding lever 150, and because the fulcrum positions of the levers 150 are different, the amplitudes of the simple harmonic vibration of the piston 170 driven by the corresponding levers 150 are different, so that the amplitude of the simple harmonic vibration of the piston 170 can be determined through the calibrated scale by calibrating the amplitude of the fulcrum positions. The amplitude is determined by identifying the calibration scale and comparing the amplitude can calibrate the probe under test 320.
Optionally, as shown in fig. 3, the processor 330 is connected to the controller 110 of the piston sound generator.
The processor 330 is connected to the controller 110, so that the processor 330 can automatically give an instruction to the controller 110 according to the processed data, thereby automatically controlling the piston sounding device.
Optionally, as shown in fig. 3, a displacement sensor 340 is disposed on the piston 170 of the piston sound generating device, and the displacement sensor 340 is connected to the processor 330 for sensing a displacement change of the piston 170.
Because the variation of the simple harmonic vibration of the piston 170 is in positive correlation with the variation of the sound pressure generated by the piston, the displacement sensor 340 is arranged to sense the displacement variation of the piston 170, so as to calculate a theoretical sound pressure parameter according to the displacement variation, and then compare the theoretical sound pressure parameter with the parameter measured by the standard probe 310 to judge whether the sound pressure generated in the cavity 120 has an error caused by air leakage and the like. If there is an error, the air pressure in the cavity 120 may be balanced by controlling the solenoid valve 190.
Optionally, as shown in fig. 3, the processor 330 of the piston sound generating device includes a computer 331 and a data acquisition card 332, the data acquisition card 332 is connected to the computer 331, the standard probe 310, the detected probe 320 and the displacement sensor 340, respectively, and the computer 331 is connected to the controller 110.
The processor 330 includes a computer 331 and a data acquisition card 332, and the data acquisition card 332 can acquire data of the standard probe 310, the detected probe 320 and the displacement sensor 340 at a high speed. The computer 331 is connected with the data acquisition card 332, data acquired by the data acquisition card 332 can be imported into the computer 331, and the computer 331 can process and display the imported data through software. The parameters displayed by the computer 331 may include the sound pressure waveform, amplitude, frequency, etc. measured by the standard probe 310 and the detected probe 320. The variation of the displacement of the piston 170 measured by the displacement sensor, the theoretical sound pressure parameter calculated by the variation, and the like may also be included. Of course, in practical applications, the parameters displayed by the computer 331 include, but are not limited to, the above examples, and may also include other parameters required by those skilled in the art.
In a further aspect of the present invention, there is provided a method of calibrating a probe using the probe calibration device of any one of the above, with reference to fig. 4, comprising:
step 210: probe data of the standard probe 310 is received.
Step 220: probe data of the probe under test 320 is received.
Step 230: the detection data of the standard probe 310 and the detection data of the detected probe 320 are compared.
Step 240: and calibrating the measured value of the detected probe 320 according to the comparison result.
The probe calibration device can more accurately calibrate the detected probe 320 by applying the method for calibrating the probe.
By comparing the data of the standard probe 310 with the data of the probe 320 to be tested, the probe 320 to be tested is calibrated by using the comparison result, so that the calibration precision is high.
In another aspect of the present invention, there is provided a method for calibrating a probe by using the above probe calibration apparatus including a scale for calibrating an acoustic pressure amplitude, as shown in fig. 4, including:
step 250: probe data of the probe under test 320 is received.
Step 260: the read support bar 160 corresponds to the value of the sound pressure amplitude calibration scale on the lever 150.
Step 270: and comparing the value of the sound pressure amplitude calibration scale with the detection data of the detected probe 320.
Step 280: and calibrating the measured value of the detected probe 320 according to the comparison result.
By comparing the calibration scale with the data of the detected probe 320, the data of the standard probe 310 does not need to be collected and processed, so the calibration mode has simple data processing and convenient and quick calibration of the detected probe 320.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A piston sound generating apparatus, comprising: the device comprises a controller, a cavity with a port, a first driving assembly, a second driving assembly, a lever, a supporting rod and a piston; the piston is arranged at a port of the cavity to seal the cavity, two ends of the lever are respectively in transmission connection with the piston and the first driving assembly, one end of the supporting rod is abutted against the lever, the other end of the supporting rod is in transmission connection with the second driving assembly, and the controller is respectively in signal connection with the first driving assembly and the second driving assembly; the first driving component drives one end of the lever, which is connected with the first driving component, to do simple harmonic motion along the abutting end of the supporting rod, the other end of the lever drives the piston to do simple harmonic vibration along the axial direction of the cavity, and the second driving component drives the supporting rod to move along the extending direction of the lever;
the piston is sleeved with a spring, and two ends of the spring are respectively abutted to the port of the cavity and one end of the lever connected with the piston.
2. The piston sound production device of claim 1, wherein the second driving assembly comprises a driving motor, a lead screw and a lead screw nut, the driving motor is in transmission connection with the lead screw, the lead screw nut is sleeved on the lead screw, and the lead screw nut is connected with one end of the support rod, which is far away from the lever; the extending direction of the lead screw is parallel to the extending direction of the lever, and the driving motor is in signal connection with the controller.
3. The piston sound production device according to any one of claims 1 to 2, wherein one end of the support rod, which abuts against the lever, is provided with a fulcrum bearing or a fulcrum roller, the fulcrum bearing or the fulcrum roller is rotatably connected with the support rod, and both the fulcrum bearing and the fulcrum roller can roll on the lever; the supporting rod comprises a first screw rod, a second screw rod and a sleeve, one end of the sleeve is sleeved with the first screw rod, the other end of the sleeve is sleeved with the second screw rod, and the fulcrum bearing or the fulcrum roller is arranged at one end, far away from the sleeve, of the second screw rod.
4. The piston sound generating device according to claim 1, wherein the first driving assembly comprises a rotating motor, a cam and a connecting rod, the rotating motor is in transmission connection with the cam, the lever is connected with one end of the connecting rod, the other end of the connecting rod is abutted against the cam, and the rotating motor is in signal connection with the controller.
5. The piston sound generator of claim 1, wherein the port of the cavity comprises a tapered portion; and an electromagnetic valve is arranged on one side of the cavity, which is far away from the port, and the electromagnetic valve is in signal connection with the controller.
6. A probe calibration device, comprising: a standard probe, a probe mount under test, a processor, and a piston sound generator of any of claims 1 to 5; the standard probe and the detected probe mounting port are arranged on a cavity of the piston sounding device, the standard probe is connected with the processor, and the detected probe mounting port is used for mounting a detected probe connected with the processor.
7. The probe calibration device according to claim 6, wherein a sound pressure amplitude calibration scale is arranged on the lever of the piston sounding device; the processor is connected with the controller of the piston sounding device; a displacement sensor is arranged on a piston of the piston sounding device, and the displacement sensor is connected with the processor and used for sensing the displacement of the piston; the processor of the piston sounding device comprises a computer and a data acquisition card, the data acquisition card is connected with the computer, the standard probe, the detected probe and the displacement sensor respectively, and the computer is connected with the controller.
8. A method of calibrating a probe using the probe calibration device of claim 6 or 7, comprising:
receiving the detection data of the standard probe;
receiving detection data of the detected probe;
comparing the detection data of the standard probe with the detection data of the detected probe;
and calibrating the measured value of the detected probe according to the comparison result.
9. A method of calibrating a probe using the probe calibration device of claim 7, comprising:
receiving detection data of the detected probe;
reading the numerical value of the sound pressure amplitude calibration scale on the support rod corresponding to the lever;
comparing the value of the sound pressure amplitude calibration scale with the detection data of the detected probe;
and calibrating the measured value of the detected probe according to the comparison result.
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| CN114146891A (en) * | 2021-11-11 | 2022-03-08 | 苏州赫米兹健康科技有限公司 | Miniature infrasonic wave generator |
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