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Ultrasonic transducer excitation frequency selection method

A technology of ultrasonic transducer and excitation frequency, applied in electrical components, piezoelectric effect/electrostrictive or magnetostrictive motors, generators/motors, etc., can solve problems such as vibration instability and achieve vibration stability , the effect of large amplitude

Active Publication Date: 2018-09-21
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the transducer is excited at the mechanical resonance frequency, the vibration is unstable, and the transducer is an electromechanical coupling body. Not only the electromechanical coupling exists inside the transducer, but also the coupling with the external matching inductance. To select the transducer The excitation frequency cannot be analyzed solely from the mechanical branch of the transducer, but should be analyzed and determined from the electromechanical coupling process of the entire transducer excitation system

Method used

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  • Ultrasonic transducer excitation frequency selection method
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  • Ultrasonic transducer excitation frequency selection method

Examples

Experimental program
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Embodiment 1

[0055] An embodiment of the present invention provides a method for selecting the excitation frequency of an ultrasonic transducer, such as Figure 4a As shown, the method includes the following steps:

[0056] 101. For an ultrasonic transducer to be processed, determine a sweep frequency range of the ultrasonic transducer according to parameters of the ultrasonic transducer.

[0057] For example, the mechanical resonant frequency of the ultrasonic transducer is obtained according to the admittance parameter of the ultrasonic transducer; and the sweep frequency range of the ultrasonic transducer is determined according to the mechanical resonant frequency and a preset frequency threshold.

[0058] 102. Acquire the resistance and reactance values ​​of the ultrasonic transducer at each frequency node according to each frequency node in the frequency sweep range.

[0059] 103. According to the resistance and reactance values ​​of each frequency node in the frequency sweep range,...

Embodiment 2

[0068] This embodiment can be realized through the following steps:

[0069] Step 1: Use an impedance analyzer to scan the impedance characteristics near the mechanical resonance frequency of the ultrasonic transducer to obtain the corresponding resistance R and reactance X values ​​at various frequencies near the mechanical resonance frequency;

[0070] Step 2: Input the value of resistance R and reactance X at each point into the controller program, and the controller program analyzes the point where the minimum reactance X is located, and calculates the ratio of reactance X to resistance R at this frequency; stores the frequency and The absolute value K of the ratio of reactance to resistance at this point min ;Calculate and store the ratio of reactance X to resistance R at each frequency;

[0071] Step 3: Set the maximum absolute value K of the ratio of reactance X to resistance R max , the controller program screens out that the absolute value of the ratio of reactance ...

experiment example

[0112] Using an impedance analyzer to scan an ultrasonic transducer with a mechanical resonance frequency of 26712Hz in the frequency range of 24KHz-30KHz, the number of sweep points is 1600 points, and the resistance R and reactance X of the transducer in this frequency band are measured; the computer The program draws an impedance circle from the measured values ​​of resistance R and reactance X, such as Figure 7 shown. according to Figure 7 It can be seen that the farther to the left, the more stable the impedance characteristic of the transducer, the stronger the ability of the transducer to resist variable load during vibration, and the more stable the vibration. The controller program analyzes the point where the minimum reactance X is located, and calculates the absolute value K of the ratio of reactance X to resistance at this frequency min ;Calculate and store the ratio of reactance X to resistance R at each frequency, the point at which the ratio of reactance to ...

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Abstract

The invention provides an ultrasonic transducer excitation frequency selection method. The method comprises the steps that as for the ultrasonic transducer to be processed, the frequency sweep range of the ultrasonic transducer is determined according to the parameters of the ultrasonic transducer; the resistance and reactance values of the ultrasonic transducer under each frequency node are acquired according to each frequency node within the frequency sweep range; the screening critical condition used for screening the working frequency of the ultrasonic transducer is determined according tothe resistance and reactance values of each frequency node within the frequency sweep range; and at least one frequency node is selected out of the frequency sweep range to act as the working frequency of the excitation ultrasonic transducer according to the screening rules and the screening critical condition. The ultrasonic transducer and the external matching inductance are enabled to generatecoupling resonance by the excitation frequency of the ultrasonic transducer selected by the method so as to achieve the optimal conversion effect from electric energy to mechanical energy, the amplitude is maximum and vibration is stable.

Description

technical field [0001] The invention relates to the technical field of ultrasonic processing, in particular to a method and device for selecting the excitation frequency of an ultrasonic transducer, and a computer storage medium. Background technique [0002] In ultrasonic vibration processing, the ultrasonic transducer receives the electric energy output by the ultrasonic power supply and converts it into mechanical energy to drive the tool to generate ultrasonic micron-level vibration, so as to realize the periodic separation of the tool and the workpiece, reduce the cutting force, and improve the machined surface Quality, extended tool life, this technology is suitable for difficult-to-machine materials processing. [0003] The ultrasonic transducer is a key component of the ultrasonic machining system, which adopts a sandwich structure (such as figure 1 As shown), it consists of a horn 1, a piezoelectric ceramic stack 2, a rear cover 3 and a fastening bolt 4. The equiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02N2/06
CPCH02N2/06
Inventor 姜兴刚张德远耿大喜朱咸斌
Owner BEIHANG UNIV
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