CN117990197A - Object natural frequency measurement system and measurement method - Google Patents

Object natural frequency measurement system and measurement method Download PDF

Info

Publication number
CN117990197A
CN117990197A CN202410179532.XA CN202410179532A CN117990197A CN 117990197 A CN117990197 A CN 117990197A CN 202410179532 A CN202410179532 A CN 202410179532A CN 117990197 A CN117990197 A CN 117990197A
Authority
CN
China
Prior art keywords
signal
ultrasonic
module
frequency
microcontroller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202410179532.XA
Other languages
Chinese (zh)
Inventor
吕富勇
杜彤
王杰
陈锦河
刘泽宇
王亚洲
徐佳瑞
吴泽宇
耿超
柳加旺
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nanjing University of Information Science and Technology
Original Assignee
Nanjing University of Information Science and Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nanjing University of Information Science and Technology filed Critical Nanjing University of Information Science and Technology
Priority to CN202410179532.XA priority Critical patent/CN117990197A/en
Publication of CN117990197A publication Critical patent/CN117990197A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
    • G01H9/008—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means by using ultrasonic waves

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

The invention discloses a system and a method for measuring natural frequency of an object, wherein the measuring system comprises an ultrasonic transmitting module, an ultrasonic receiving module and a control module; the control module comprises a microcontroller, an isolation driving circuit and an AD conversion module; the ultrasonic receiving module, the AD conversion module, the microcontroller, the isolation driving circuit and the ultrasonic transmitting module are sequentially connected; the measuring method is that a microcontroller generates a frequency-adjustable modulation signal, an ultrasonic wave transmitting module acquires a transmitting wave by utilizing a carrier signal and the modulation signal, and excites an object to be measured; the ultrasonic receiving module demodulates and processes the echo signal returned by the object to be detected, and the microcontroller analyzes the amplitude change of the modulating signal in the echo signal, judges the resonance peak value of the modulating signal and finds the corresponding frequency of the resonance peak value, thereby determining the natural frequency of the object to be detected. The invention measures the natural frequency of the object with low resonance frequency by utilizing high-frequency ultrasonic waves, and has the advantages of small volume, simple operation, no damage to the object to be measured and the like.

Description

Object natural frequency measurement system and measurement method
Technical Field
The invention belongs to the technical field of natural frequency measurement of objects, and particularly relates to a natural frequency measurement system and a natural frequency measurement method of an object.
Background
Natural frequency refers to the frequency at which a mechanical system is free to vibrate without external interference. The purpose of the natural frequency determination is to determine the natural frequency of a system, and the measured natural frequency not only helps to correct the finite element model, further optimize the object structure, but also to verify whether the object structure meets the design expectations.
Common methods for measuring the natural frequency of an object are a hammering method and a vibrating table test method. The hammering method is to knock a test piece by using a weight, which is equivalent to exciting an object with a pulse, and obtain a natural frequency by measuring the response of the object. The method may damage the object to be measured during the tapping process. The test method of the vibration table is to design a vibration clamp, fix an object on the clamp, fix the clamp on the vibration table, install a vibration sensor on a test piece, and utilize the vibration table to carry out sweep frequency measurement. Drawbacks of this method include: the operation is complicated, the occupied space is large, the design and production period of the clamp is long, the vibration characteristic of the clamp can influence the measurement accuracy and the like. In addition, although the vibration table can test vibration in a small scale before test, if the damping of the object is very small, the object still has the risk of being damaged when reaching a resonance point.
Therefore, the above measurement methods all have a risk of damaging the object to be measured.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides an object natural frequency measuring system and an object natural frequency measuring method, which can accurately measure the natural frequency of an object with lower solid frequency under the condition of not damaging the object to be measured by utilizing the transmitted wave obtained by modulation.
The invention provides the following technical scheme:
In a first aspect, an object natural frequency measurement system is provided, including an ultrasonic wave transmitting module, an ultrasonic wave receiving module, and a control module; the ultrasonic wave transmitting module is used for generating and transmitting a transmitting wave; the ultrasonic receiving module is used for receiving and processing echo signals; the control module comprises a microcontroller, an isolation driving circuit and an AD conversion module; the ultrasonic receiving module, the AD conversion module, the microcontroller, the isolation driving circuit and the ultrasonic transmitting module are sequentially connected; the AD conversion module is used for carrying out analog-to-digital conversion on the echo signals processed by the ultrasonic receiving module and sending the echo signals to the microcontroller; the microcontroller is used for generating a modulation signal and simultaneously analyzing the received processed echo signal in real time; the isolation driving circuit amplifies the power of the modulation signal to drive the ultrasonic wave transmitting module to emit transmitting waves.
As a preferable technical scheme of the invention, the ultrasonic wave transmitting module comprises an ultrasonic wave generating circuit and an ultrasonic wave transducer; the ultrasonic wave generating circuit is used for converting 220V and 50Hz alternating current input by alternating current into high-frequency electric signals and transmitting the high-frequency electric signals to the ultrasonic transducer; the ultrasonic transducer is used for converting the high-frequency electric signal into mechanical vibration so as to generate a carrier signal; the ultrasonic wave transmitting module acquires a transmitting wave by utilizing the carrier signal and the modulating signal.
As a preferable technical scheme of the invention, the ultrasonic receiving module comprises an ultrasonic receiver and a signal conditioning circuit; the ultrasonic receiver is used for receiving an echo signal returned by the object to be detected, converting the echo signal into an electric signal and sending the electric signal to the signal conditioning circuit; the signal conditioning circuit comprises a signal demodulation circuit and a signal processing circuit; the signal demodulation circuit is used for demodulating the electric signal and sending the electric signal to the signal processing circuit; the signal processing circuit is used for acquiring the amplitude and the frequency of a modulation signal in the electric signal and sending the amplitude and the frequency to the microcontroller through the AD conversion module; the signal processing circuit comprises a double operational amplifier and a voltage comparison chip.
As a preferable technical scheme of the invention, the invention also comprises a display module which is connected with the microcontroller; the display module comprises a display screen and is used for displaying the natural frequency of the object to be detected and setting the starting frequency and the ending frequency of the modulation signal.
As a preferable technical scheme of the invention, the invention also comprises a power supply module; the power module comprises an alternating current input power supply and an auxiliary power supply; the alternating current input power supply is connected with the ultrasonic wave transmitting module and the auxiliary power supply; the auxiliary power supply is connected with the display module, the microcontroller, the isolation driving circuit and the ultrasonic receiving module.
In a second aspect, there is provided a measurement method of the object natural frequency measurement system according to the first aspect, including:
Controlling the ultrasonic wave transmitting module to transmit a transmitting wave to an object to be detected;
Receiving echo signals of the object to be detected which are demodulated and processed by the ultrasonic receiving module;
And finding out a resonance peak value and a corresponding frequency of the modulation signal according to the received echo signal, and determining the natural frequency of the object to be detected.
As a preferable technical scheme of the invention, 7. The method for controlling the ultrasonic wave transmitting module to transmit the transmitting wave to the object to be measured specifically comprises the following steps: the microcontroller sends a modulation signal s (t) to the ultrasonic wave transmitting module; the modulating signal S (t) modulates the carrier signal C (t) generated by the ultrasonic transmitting module, and further generates a transmitting wave S D (t), expressed as:
SD(t)＝s(t)C(t) (1)；
The emission wave S D (t) excites the object to be detected, and the object to be detected returns an echo signal.
As a preferred technical solution of the present invention, 8. The receiving the echo signal of the object to be measured demodulated and processed by the ultrasonic receiving module specifically includes: the echo signals are converted into electric signals by an ultrasonic receiver and demodulated by the signal demodulation circuit to obtain the amplitude of the modulated signals; the electric signal is amplified to a set multiple by a double operational amplifier so that the AD conversion module obtains the change of the amplitude of the modulation signal and sends the change to the microcontroller; the amplified electric signals are converted into common-frequency and common-phase square wave signals by a voltage comparison chip, so that the AD conversion module obtains the frequency of the modulation signals and sends the frequency to the microcontroller.
As a preferred technical solution of the present invention, the determining the natural frequency of the object to be measured by finding the resonance peak value and the corresponding frequency of the modulated signal according to the received echo signal specifically includes: and according to the amplitude change and the frequency of the received modulation signal, the microcontroller analyzes the maximum amplitude and the corresponding frequency f 1,f1 to obtain the natural frequency of the object to be detected.
As a preferred technical solution of the present invention, after determining the natural frequency of the object to be measured, the method further includes: repeating the measurement for a plurality of times, judging whether the natural frequency error of the plurality of times is within a set value, if so, averaging the natural frequency of the plurality of times and outputting a result; and if the set value is not within the set value, the display screen sends out warning information.
Compared with the prior art, the invention has the beneficial effects that:
1. The object natural frequency measurement system provided by the invention comprises a control module, an ultrasonic wave transmitting module and an ultrasonic wave receiving module, wherein the ultrasonic wave transmitting module acquires a transmitting wave to excite an object to be measured by utilizing a carrier signal and a modulating signal, and when the frequency of the modulating signal of the transmitting wave is the same as the natural frequency of the object to be measured, resonance is generated, so that more accurate natural frequency information is obtained, and the measurement accuracy is improved; and can not cause the damage of the object, is suitable for sensitive or undamaged objects, and has higher universality.
2. According to the measuring method of the object natural frequency measuring system, the microcontroller generates the frequency-adjustable modulation signal, the ultrasonic wave transmitting module acquires the transmission wave by utilizing the carrier signal and the modulation signal, the object to be measured is excited, the echo signal returned by the object to be measured is demodulated and processed through the ultrasonic wave receiving module, the microcontroller analyzes the amplitude change condition of the modulation signal in the echo signal, and the resonance peak value of the modulation signal is judged and the corresponding frequency is found, so that the natural frequency of the object to be measured is determined, the operation is simple and convenient, the measurement is rapid, and the cost and the energy consumption are low; the method can measure for a plurality of times, and can reduce measurement errors by averaging the natural frequencies of the plurality of times of measurement, so that the measurement result is more accurate.
Drawings
FIG. 1 is a schematic diagram of a system for measuring natural frequencies of objects according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of an ultrasonic transmission module according to an embodiment of the present invention;
Fig. 3 is a conversion flowchart of an AD conversion module in the embodiment of the present invention;
FIG. 4 is a circuit diagram of a isolation driving circuit in an embodiment of the invention;
FIG. 5 is a flow chart of a method for measuring natural frequency of an object in an embodiment of the invention;
FIG. 6 is a schematic diagram of the generation of a transmitted wave in an embodiment of the present invention;
FIG. 7 is a schematic diagram of a signal demodulation circuit in an embodiment of the invention;
FIG. 8 is a waveform diagram of a demodulated echo signal in an embodiment of the invention;
fig. 9 is a graph of amplitude versus frequency for a modulated signal in an embodiment of the invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
Example 1
The embodiment provides an object natural frequency measurement system. As shown in fig. 1, the measurement system includes: the device comprises an ultrasonic transmitting module, an ultrasonic receiving module, a control module, a power module and a display module.
The ultrasonic wave transmitting module is used for generating and transmitting a transmitting wave. Specifically, the ultrasonic wave transmitting module comprises an ultrasonic wave generating circuit and an ultrasonic wave transducer. As shown in fig. 2, the ultrasonic wave generating circuit is used for converting 220V, 50Hz alternating current input by alternating current into high frequency electric signals and transmitting the high frequency electric signals to the ultrasonic transducer. The ultrasonic transducer is used for converting the high-frequency electric signal into mechanical vibration so as to generate a carrier signal. The ultrasonic wave transmitting module acquires a transmitting wave by utilizing a carrier signal and a modulating signal.
The ultrasonic receiving module is used for receiving and processing echo signals returned by the object to be detected. Specifically, the ultrasonic receiving module comprises an ultrasonic receiver and a signal conditioning circuit. The ultrasonic receiver is used for receiving an echo signal returned by the object to be detected, converting the echo signal into an electric signal and sending the electric signal to the signal conditioning circuit. The signal conditioning circuit comprises a signal demodulation circuit and a signal processing circuit. The signal demodulation circuit is used for demodulating the electric signal and sending the electric signal to the signal processing circuit. The signal processing circuit is used for acquiring the amplitude and the frequency of a modulation signal in the electric signal and sending the amplitude and the frequency to the microcontroller through the AD conversion module. The signal processing circuit comprises a double operational amplifier and a voltage comparison chip.
The control module comprises a microcontroller, an isolation driving circuit and an AD conversion module. Specifically, the AD conversion module is used for performing analog-to-digital conversion on the echo signal processed by the ultrasonic receiving module and sending the echo signal to the microcontroller.
Further, the AD conversion module comprises a high-speed analog-to-digital converter (ADC) with 12-bit precision and 15 channels, and is used for carrying out analog-to-digital conversion on the received processed echo signals. The ADC conversion speed can reach hundreds of kHz, and the conversion result is automatically stored in a register, so that the requirement of data sampling is completely met. As shown in fig. 3, the AD conversion module performs conversion analysis on the received echo signal, specifically as follows:
After the ADC is electrified and initialized, setting timing start. The arrival timing is AD converted, i.e., an analog signal is converted into a digital signal. In this embodiment, the electrical signal obtained by the processing is converted into a digital signal.
The microcontroller is used for generating a modulation signal and analyzing the received processed signal. Specifically, the generated modulated signal is passed to the isolation driving circuit. The microcontroller adopts a singlechip, and in this embodiment is specifically an STC32G12K128 singlechip. And an input pin of the singlechip is used for receiving the signal sent by the AD conversion module.
The isolation driving circuit is used for driving the ultrasonic wave transmitting module to generate and emit transmitting waves by amplifying the power of the modulating signal. In particular, the isolation drive circuit may be regarded as a bridge between the microcontroller and the MOSFET. As shown in fig. 4, the isolation driving circuit uses a driving chip TC4422 to amplify the modulation signal, and converts the two paths of modulation signals with complementary dead zones output by the microcontroller into driving signals capable of driving the MOSFETs. The modulated signal is driven and amplified by TC4422 and then electrically isolated by a transformer. The electrical isolation is to prevent the microcontroller from damaging the chip and other components by high voltage impact of the MOSFET power circuit and to improve the reliability and tamper resistance of the system.
Further, as shown in fig. 1, the ultrasonic receiving module, the AD conversion module, the microcontroller, the isolation driving circuit, and the ultrasonic transmitting module are sequentially connected.
The power module comprises an alternating current input power supply and an auxiliary power supply. The alternating current input power supply is connected with the ultrasonic wave transmitting module and the auxiliary power supply. The auxiliary power supply is connected with the display module, the microcontroller, the isolation driving circuit and the ultrasonic receiving module and supplies power to the modules.
The display module is connected with the microcontroller. The display module comprises a display screen and is used for displaying the natural frequency of the object to be detected and setting the starting frequency and the ending frequency of the modulation signal. In this embodiment, the display screen is a 2.8 inch 9341 liquid crystal touch display screen, and the start frequency and the end frequency of the emitted wave can be set by touching the display screen.
Example 2
As shown in fig. 5, the present embodiment provides a method for measuring the natural frequency of an object provided in embodiment 1. The method comprises the following specific steps:
step 1: and controlling the ultrasonic wave transmitting module to transmit the transmitting wave to the object to be detected.
Step 1.1, the microcontroller sends a modulation signal s (t) to the ultrasonic wave transmitting module.
Specifically, the ac power input interface and auxiliary power switch are turned on. After the measuring system is electrified, an object to be measured is placed on the vibrating table, and the starting frequency and the ending frequency of the modulating signal s (t) are set through the display screen.
Step 1.2, modulating the carrier signal C (t) generated by the ultrasonic transmitting module by the modulating signal S (t), thereby generating a transmitting wave S D (t), which is expressed as:
SD(t)＝s(t)C(t) (1)。
specifically, as shown in fig. 6, the carrier signal C (t) is an ultrasonic signal of high frequency, and the modulated signal s (t) is a low frequency signal. The 1-period modulated signal s (t) may correspond to a number of carrier signal periods. The carrier signal C (t) in this embodiment is expressed as:
C(t)＝cosωct (2)
where ω c represents the angular velocity of the carrier signal and t represents each instant.
The modulated signal s (t) is a smooth sequence signal in this embodiment.
And 1.3, exciting an object to be detected by the emission wave S D (t), and returning an echo signal by the object to be detected.
Step 2: and receiving the echo signals of the object to be detected, which are demodulated and processed by the ultrasonic receiving module.
And 2.1, converting the echo signal into an electric signal by an ultrasonic receiver, and demodulating the electric signal by the signal demodulation circuit to obtain the amplitude of the modulated signal.
Specifically, as shown in fig. 7 and 8, the amplitude of the modulated signal in the echo signal is obtained after the echo signal passes through a band-pass filter, a full-wave rectifier and a low-pass filter in the signal demodulation circuit. 1, 2, and 3 in FIG. 8 are waveform diagrams of echo signals passing through a band pass filter, a full wave rectifier, and a low pass filter, respectively. The bandpass filter, the full-wave rectifier and the low-pass filter are all of the prior art, and their roles are not described again.
And 2.2, amplifying the electric signal to a set multiple by a double operational amplifier so that the AD conversion module obtains the change of the amplitude of the modulation signal and sends the change to the microcontroller.
Specifically, the dual-operational amplifier in this embodiment adopts LM358 to amplify the received electrical signal to 100 times, so that the AD conversion module obtains the variation of the amplitude of the modulated signal.
And 2.3, converting the amplified electric signal into a same-frequency and same-phase square wave signal by a voltage comparison chip, so that the AD conversion module obtains the frequency of the modulation signal and sends the frequency to the microcontroller.
Specifically, the voltage comparison chip in this embodiment employs LM311. When the amplified electric signal voltage is greater than 0, the LM311 outputs a high level; when the amplified electric signal voltage is smaller than 0, the LM311 outputs a low level, so that the sinusoidal electric signal is converted into a same-frequency and same-phase square wave voltage signal, and the frequency of the electric signal is obtained in real time through the capturing mode of the microcontroller.
Step 3: and finding out a resonance peak value and a corresponding frequency of the modulation signal according to the received echo signal, and determining the natural frequency of the object to be detected.
Specifically, as shown in fig. 9, according to the amplitude variation and the frequency of the received modulation signal, the microcontroller analyzes to obtain the maximum amplitude and the corresponding frequency f 1,f1, which are the natural frequency of the object to be measured.
Step 4: repeating the measurement for a plurality of times, judging whether the natural frequency error of the plurality of times is within a set value, if so, averaging the natural frequency of the plurality of times and outputting a result; and if the set value is not within the set value, the display screen sends out warning information.
As shown in fig. 5, the present embodiment measures the natural frequency three times and obtains the average value thereof.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.

Claims (10)

1. An object natural frequency measurement system, characterized in that: the device comprises an ultrasonic transmitting module, an ultrasonic receiving module and a control module;
The ultrasonic wave transmitting module is used for generating and transmitting a transmitting wave;
The ultrasonic receiving module is used for receiving and processing echo signals returned by the object to be detected;
the control module comprises a microcontroller, an isolation driving circuit and an AD conversion module;
The ultrasonic receiving module, the AD conversion module, the microcontroller, the isolation driving circuit and the ultrasonic transmitting module are sequentially connected;
The AD conversion module is used for carrying out analog-to-digital conversion on the echo signals processed by the ultrasonic receiving module and sending the echo signals to the microcontroller; the microcontroller is used for generating a modulation signal and simultaneously analyzing the received processed echo signal in real time; the isolation driving circuit amplifies the power of the modulation signal to drive the ultrasonic wave transmitting module to emit transmitting waves.
2. The object natural frequency measurement system according to claim 1, wherein: the ultrasonic transmitting module comprises an ultrasonic generating circuit and an ultrasonic transducer;
The ultrasonic wave generating circuit is used for converting 220V and 50Hz alternating current input by alternating current into high-frequency electric signals and transmitting the high-frequency electric signals to the ultrasonic transducer;
the ultrasonic transducer is used for converting the high-frequency electric signal into mechanical vibration so as to generate a carrier signal;
the ultrasonic wave transmitting module acquires a transmitting wave by utilizing the carrier signal and the modulating signal.
3. The object natural frequency measurement system according to claim 1, wherein: the ultrasonic receiving module comprises an ultrasonic receiver and a signal conditioning circuit;
The ultrasonic receiver is used for receiving an echo signal returned by the object to be detected, converting the echo signal into an electric signal and sending the electric signal to the signal conditioning circuit;
the signal conditioning circuit comprises a signal demodulation circuit and a signal processing circuit;
the signal demodulation circuit is used for demodulating the electric signal and sending the electric signal to the signal processing circuit;
the signal processing circuit is used for acquiring the amplitude and the frequency of a modulation signal in the electric signal and sending the amplitude and the frequency to the microcontroller through the AD conversion module;
the signal processing circuit comprises a double operational amplifier and a voltage comparison chip.
4. The object natural frequency measurement system according to claim 1, wherein: the display module is connected with the microcontroller;
the display module comprises a display screen and is used for displaying the natural frequency of the object to be detected and setting the starting frequency and the ending frequency of the modulation signal.
5. The object natural frequency measurement system according to claim 4, wherein: the power supply module is also included;
the power module comprises an alternating current input power supply and an auxiliary power supply;
the alternating current input power supply is connected with the ultrasonic wave transmitting module and the auxiliary power supply;
The auxiliary power supply is connected with the display module, the microcontroller, the isolation driving circuit and the ultrasonic receiving module.
6. A measurement method of the object natural frequency measurement system according to any one of claims 1 to 5, comprising:
Controlling the ultrasonic wave transmitting module to transmit a transmitting wave to an object to be detected;
Receiving echo signals of the object to be detected which are demodulated and processed by the ultrasonic receiving module;
And finding out a resonance peak value and a corresponding frequency of the modulation signal according to the received echo signal, and determining the natural frequency of the object to be detected.
7. The method for measuring natural frequencies of objects according to claim 6, wherein said controlling the ultrasonic wave transmitting module to transmit the transmitted wave to the object to be measured comprises:
The microcontroller sends a modulation signal s (t) to the ultrasonic wave transmitting module;
the modulating signal S (t) modulates the carrier signal C (t) generated by the ultrasonic transmitting module, and further generates a transmitting wave S D (t), expressed as:
SD(t)＝s(t)C(t) (1)；
The emission wave S D (t) excites the object to be detected, and the object to be detected returns an echo signal.
8. The method for measuring natural frequency of object according to claim 6, wherein said receiving the echo signal of the object to be measured demodulated and processed by the ultrasonic receiving module comprises:
The echo signals are converted into electric signals by an ultrasonic receiver and demodulated by the signal demodulation circuit to obtain the amplitude of the modulated signals;
The electric signal is amplified to a set multiple by a double operational amplifier so that the AD conversion module obtains the change of the amplitude of the modulation signal and sends the change to the microcontroller;
the amplified electric signals are converted into common-frequency and common-phase square wave signals by a voltage comparison chip, so that the AD conversion module obtains the frequency of the modulation signals and sends the frequency to the microcontroller.
9. The method for measuring natural frequencies of objects according to claim 6, wherein the step of finding resonance peaks and corresponding frequencies of the modulated signals according to the received echo signals to determine the natural frequencies of the objects to be measured comprises:
And according to the amplitude change and the frequency of the received modulation signal, the microcontroller analyzes the maximum amplitude and the corresponding frequency f 1,f1 to obtain the natural frequency of the object to be detected.
10. The method for measuring natural frequencies of objects according to claim 6, further comprising, after determining the natural frequency of the object to be measured: repeating the measurement for a plurality of times, judging whether the natural frequency error of the plurality of times is within a set value, if so, averaging the natural frequency of the plurality of times and outputting a result; and if the set value is not within the set value, the display screen sends out warning information.
CN202410179532.XA 2024-02-18 2024-02-18 Object natural frequency measurement system and measurement method Pending CN117990197A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202410179532.XA CN117990197A (en) 2024-02-18 2024-02-18 Object natural frequency measurement system and measurement method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202410179532.XA CN117990197A (en) 2024-02-18 2024-02-18 Object natural frequency measurement system and measurement method

Publications (1)

Publication Number Publication Date
CN117990197A true CN117990197A (en) 2024-05-07

Family

ID=90888435

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202410179532.XA Pending CN117990197A (en) 2024-02-18 2024-02-18 Object natural frequency measurement system and measurement method

Country Status (1)

Country Link
CN (1) CN117990197A (en)

Similar Documents

Publication Publication Date Title
CN107015230B (en) ultrasonic ranging method
JP5628185B2 (en) Method for determining the start instant of a periodically oscillating signal response
JPH10253339A (en) Method and apparatus for measurement by utilizing sound wave
CN101458332B (en) Ultrasonic ranging method and system thereof
CN105911308A (en) Wind speed and wind direction measurement method
CN107064941A (en) A kind of ultrasonic distance-measuring method of three-stage pulse excitation and feature extraction
CN1536358A (en) Apparatus and method for measuring dielectric specific gravity/concentration using ultrasonic wave
CN108802203B (en) rod-shaped member internal defect positioning method based on multi-mode technology
CN110865124B (en) Nonlinear ultrasonic guided wave detection system and method based on linear power amplifier
CN104535140B (en) The resonant frequency method of testing of ultrasonic flowmeter transducer
CN117990197A (en) Object natural frequency measurement system and measurement method
CN204988220U (en) Bridge moves amount of deflection measurement system based on ultrasonic wave principle
CN112666393A (en) Ultrasonic transducer resonant frequency detection method, system and device
CN211505333U (en) Nonlinear ultrasonic guided wave detection device
CN104749082A (en) Ultrasonic multifunctional evaluation method and ultrasonic multifunctional evaluation device for void content
CN109932148A (en) Vibration test system
CN201993341U (en) Ultrasonic detection sensor
CN105136075A (en) Bridge dynamic deflection measurement system and method based on ultrasonic principle
CN102519551A (en) Ultrasonic liquid level measurer based on pseudo code relevant technology
CN213336458U (en) Resonant frequency detection system
CN102253119B (en) Emulsion concentration online detection system and ultrasonic receiving circuit thereof
CN102590356A (en) Device for measuring sensitivity of acoustic emission sensor
CN109798973B (en) Method for testing natural frequency of non-contact ultrasonic transducer
CN113008174B (en) Electromagnetic ultrasonic sound time measuring method and device
JP3584290B2 (en) Gas concentration measuring device and gas concentration measuring method

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination