Abstract
The yarn vibration causes the yarn tension value to fluctuate, causing a change in the amount of yarn feed, thus causing a deviation of the carpet pile height from the predetermined value. To solve this problem, the sliding mode control algorithm is used to design the sliding mode function and the sliding mode control law. And four variables in the yarn vibration system are controlled by the MATLAB software. For solving the chattering problem of the control law, the sliding mode control law is improved. The fuzzy sliding mode control algorithm based on the quasisliding mode is adopted. The results show that the sliding mode control algorithm is effective, but the sliding mode control force needs to be switched at high frequency and there is severe chattering. The fuzzy sliding mode control algorithm based on quasisliding mode is adopted to achieve better control effect with a smaller force. In addition, the control force does not have high-frequency switching, and the change is relatively stable, which reduces the chattering phenomenon of sliding mode control.
Highlights
E height of carpet surface determines the evenness of the carpet surface
The yarn vibration causes the yarn tension value to fluctuate, causing a change in the amount of yarn fed, causing a deviation of the carpet pile height from the predetermined value. erefore, it is necessary to control the vibration of yarn in a reasonable range
Liaw et al [12] realized the missile guidance system control based on sliding mode variable structure control and effectively suppresses the jitter caused by the discontinuity of the system
Summary
Of yarn are controlled by using the sliding mode variable structure control method based on tension control. If not all is zero, the tension control force ut is calculated by the sliding mode control algorithm, and the tension is changed by the corresponding actuator. When the control is applied, the response values of yarn vibration vary greatly in the former 4 s. Erefore, the sliding mode controller is reasonable and effective, and the vibration response of the yarn has been significantly suppressed. After the stability of the vibration response, the sliding mode control force still needs to be switched at high frequency. After the stability of the vibration response, the sliding mode control force still needs to be switched at high frequency. e actuator needs to respond quickly, so the controller is greatly restricted in practical application
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