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A kind of feedforward cascade speed tracking control method is put forward to solve the problem of excessive fluctuations of tension which is caused by the speed mismatching between the receiving line and the releasing line when winding at high speed. After analyzing the mechanical structure of the layer winder and the relationship between the speed of floating roller and fluctuations of tension,...
Automatic welding has been used frequently on offshore pipeline projects. The productivity and reliability are most essential features of the automatic welding system. In older to satisfy the requirements of all-position welding process that welding system can weld with mated welding parameters at any position, a master-slave CAN-bus network control welding system is constructed, which is composed...
It is the more difficult to control when system is at low speed, the delay in speed measurement is a potential risk to controller stability, and friction as well. When controlling a super-low speed device, the stick-slip phenomenon appears. The precision and stability of speed are the key indexes. The mathematical model of PMSM and the system step response are analyzed, the Stribeck nonlinear friction...
Due to the fact that tension system can be affected by many factors and its structures are complex, as well as its deep coupling, nonlinearity, time-variability, and indeterminacy of its parameters, there are still many problems on its basic theoretic, measuring and controlling technology to be solved. On the basis of inferred the system mathematic model and time-variant parameters radius, adopt line...
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