Precise servo mechanism resonance frequency testing system and testing method

Abstract

The invention discloses a precise servo mechanism resonance frequency testing system and a testing method. The system comprises a tested precise servo mechanism, a servo mechanism parameter tester and a data processing display terminal industrial control computer. The tested precise servo mechanism achieves a system with the mechanical system position, the speed or acceleration controlled in a closed loop control mode. The testing method is one selected from a sweep frequency method, a step method, a white noise method or a Multitone method. Multiple kinds of excitation signals can be selected, errors due to different characteristics of different mechanisms can be reduced. The powerful software function of a micro computer and the graphical environment are used for research and development on the servo system resonance frequency tester, the operation is simple and programmed, the cost performance is high, and demands of scientific research and engineering design can be better met.

Description

technical field [0001] The invention belongs to the field of electromechanical systems, in particular to a test system and a test method for the resonant frequency of a precision servo mechanism that can be used in the field of electromechanical system test technology and precision measurement systems and can be used in the field of information processing. Background technique [0002] In a typical industrial control system equipment, the servo motor is connected to the actuator through a transmission mechanism with limited stability. The transfer function of the system often contains a zero point and a pair of conjugate poles, so it is easy to cause mechanical resonance. The influence of the load and the change of the input (output) signal may lead to the occurrence of the resonance phenomenon. [0003] Frequency characteristics are the response characteristics of a system to sinusoidal input signals of different frequencies. Like the transfer function, the frequency chara...

AI Technical Summary

Problems solved by technology

Using an LC circuit to form an oscillator has a complex structure, a single function, and is not easy to connect to other devices. Moreover, it can only display the amplitude-frequency characteristic curve, but cannot obtain the phase-frequency characteristic curve, which brings a lot of inconvenience to users and is widely used in practical applications. Large limitation; the percussion method test equipment is simple, it is to apply an exciting force to the homogeneous thin rod in the axial direction with an infinite frequency and amplitude that gradually decays with the increase of the frequency. When the percussion force is small, the amplitude in the image is small, and the As the percussion force increases, the image amplitude increases, and the waveform is severely distorted, which makes it impossible to accurately identify the frequency of the signal. Therefore, it is necessary to monitor that the percussion waveform is in a simple harmonic state during the test, and to apply the percussion force reasonably, which leads to the percussion The impact force is difficult to control, the test accuracy cannot meet the requirements, the operation is difficult and the repeatability is low; in comparison, the vibration test is cumbersome and inefficient, and cannot meet the requirements of industrial production

With the rapid development of electronic technology, traditional frequency characteristic testers can no longer fully meet the needs of scientific researchers

Images