基于頻率校正的機器人動作周期提取研究
[Abstract]:With the continuous expansion of industrial automation, joint industrial robots are widely used in automation plants. In order to prevent the mechanical system of industrial robot from malfunction, it is very important to use acoustic emission and vibration technology to detect its state. The motion of the manipulator is usually forward and forward swing, so the amplitude of the measured signal varies with the rotation of the robot. When the rotation speed increases, the signal intensity also increases, and when the rotational speed decreases or changes direction, the signal intensity becomes smaller. Before further study and analysis of the signal, it is necessary to intercept the signal according to the whole period. Its key technology is to determine the frequency of the periodic signal and the starting point of the signal action. In order to solve this problem, the phase difference spectrum correction method is first used to correct the envelope spectrum of the measured signal to obtain the precise frequency of the robot's oscillating action, and then the period time length of the signal is obtained. In this paper, two methods are proposed to determine the starting position of the cycle signal. The first method is to get the starting position of the robot by locating the lowest point in a period. In this method, the low pass filter is used to filter the envelope signal to obtain a smooth envelope curve. The cutoff frequency of the filter is determined by whether it can retain most of the energy in the envelope signal. The second is to extract the initial phase of the signal by using cross-correlation method, and then convert it to time. Get the starting position of the signal cycle. Eventually, the whole cycle of the robot's oscillating motion can be divided. The method is validated by simulation and experiment.
【學位授予單位】:昆明理工大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TP242
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