Robust adaptive amplitude control method for ultrasonic machining of hard and brittle materials

A robust adaptive and amplitude control technology, applied in adaptive control, general control system, control/regulation system, etc., can solve problems such as impedance characteristics and resonance frequency changes of vibration systems

Active Publication Date: 2020-08-28
杭州国彪超声设备有限公司
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Problems solved by technology

[0005] In order to solve the problem that the impedance characteristics and resonance frequency of the vibration system will change due to changes in load, process and en

Method used

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  • Robust adaptive amplitude control method for ultrasonic machining of hard and brittle materials
  • Robust adaptive amplitude control method for ultrasonic machining of hard and brittle materials
  • Robust adaptive amplitude control method for ultrasonic machining of hard and brittle materials

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Embodiment Construction

[0060] The present invention will be further described below in conjunction with accompanying drawing.

[0061] The present invention comprises the following steps:

[0062] Step 1: Establish the amplitude control system model:

[0063] The amplitude control system of ultrasonic machining of hard and brittle materials is a multi-input and single-output system. A feedback linearization control model is established to offset the nonlinearity of the system. The following system model is established:

[0064]

[0065] where: x 1 =[x 11 ,x 12 ,...,x 1n ] T is the measurable state variable matrix of the internal power supply driving voltage, phase shift angle, compensation capacitance, etc. of the vibration system, x 2 =[x 21 ,x 22 ,...,x 2k ] is the measurable state variable matrix such as voltage and frequency that can be measured by the sound sensor and the piezoelectric acceleration sensor; u is the voltage parameter of the system control input; y is the system ampli...

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Abstract

The invention relates to a robust adaptive amplitude control method for ultrasonic machining of hard and brittle materials. Firstly, a feedforward compensation mode is designed, and the problem of amplitude variation caused by impedance variation of transducer temperature and matching inductance temperature is solved. And then, in order to ensure the amplitude control precision of the system, eliminate the influence of uncertainty of system parameters and improve the anti-interference performance of the system, a robust adaptive controller is designed to adjust the adaptive control rate on line to ensure the amplitude control precision when the system parameters are uncertain due to the strong coupling association between the ultrasonic amplitude and the resonant frequency. According to the invention, problems in complex processing environments can be solved; the problem of amplitude fluctuation caused by load, process and environment changes, transducer temperature, matching inductance temperature and the like in the machining process is solved. High-precision stable output of the amplitude is achieved through designed strong-coupling robust self-adaptive amplitude control, and the machining precision, the machining process requirement and the machining yield of the hard and brittle materials in the actual machining process are guaranteed.

Description

technical field [0001] The invention relates to the field of ultrasonic processing of hard and brittle materials, and relates to a strong coupling robust adaptive amplitude control method applied in the ultrasonic processing of hard and brittle materials. Background technique [0002] With the advent of the 5G era, mobile phone manufacturers are following operators to enter the 5G market. In 2019, major mobile phone manufacturers such as Huawei, Apple, and Samsung have announced that they will release 5G mobile phones, because the 5G communication frequency band covers 3.3GHz-4.2 GHz, 4.4GHz-5.0GHz low frequency band and 26GHz / 28GHz / 39GHz millimeter wave high frequency band. 5G signals are very sensitive to metal shielding, especially for the new generation of 5G mobile phones, metal casings are no longer suitable for high-frequency millimeter wave bands, and higher requirements are placed on the signal transmission capabilities of mobile phone casings. [0003] New materia...

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Application Information

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IPC IPC(8): G05B13/04
CPCG05B13/042Y02P70/10
Inventor 周丽娟
Owner 杭州国彪超声设备有限公司
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