Research On Control System Of Tamping Equipment For Large Railway Maintenance Machine

With the Chinese railways leaping development, the requirement for rail line quality is increasing higher. The tamping machine is the major device for railway maintenance at present. It has the theoretical significance and practical value to research the control system of tamping machine, which can substantially improve the quality and efficiency of maintenance operations.Firstly, the control system of tamping equipment is briefly introduced. The existing electrical control system is composed by analog circuits, with lots of amplifiers. Because of zero drift of amplifiers and big deviation of resistance, the precision of control system is difficult to satisfy the request. The old solution is adding potentiometers to each link of the electrical control system in tamping machine. High precision is achieved by setting specific conditions and adjusting potentiometers during the debug.The working environment of tamping machine is complex and volatile, causing the parameters inconstant. And the traditional PID control can not modify parameters on line to achieve good control effects for complicated objects. The fuzzy adaptive PID control is combined by fuzzy theory and traditional PID control, possessing both of their advantages, that is the high accuracy of PID control and agility and rapidity of fuzzy theory.The thesis focuses on the digital circuit to realize intelligent control for tamping equipments. A digital control system based on DSP is designed in the paper, according to the operating principle and performance requirements of tamping equipments. The hardware of the system is mainly composed of three parts:signal processing of the analog inputs, to maintain the inputs in a calculated range; the kernel system based on DSP; signal processing of the outputs, to reach the drive circuits requirements. The holistic test confirms the validity and effectiveness of the proposed hardware circuits.