The response of a variable displacement pump to a control signal can be an important factor in the overall system response. It is therefore necessary in simulating such systems to have an accurate model of the dynamic behavior of the pump and its interaction with the system. This paper presents a comprehensive model of a typical variable displacement swash-plate piston pump and its servo controller. Because of the complex and non-linear form of the pumping dynamics previous researchers have used over-simplified models, particularly in respect of swash-plate forces during the pumping cycle. This paper describes a hybrid approach which combines physical models and a neural network to simulate swash-plate dynamics. Training data for the neural network is obtained through a detailed simulation of pumping dynamics. This allows the creation of a black-box model of swash-plate moments as a function of delivery pressure and swash-plate position and velocity. Training data and the hybrid model of the pump system have been verified experimentally. The final pump system model takes into account the interactions between pump, its controller and the delivery line
|Number of pages||6|
|Journal||American Society of Mechanical Engineers, The Fluid Power and Systems Technology Division (Publication) FPST|
|Publication status||Published - 1997|
McNamara, J. M., Edge, K. A., & Vaughan, N. D. (1997). Hybrid analytical/neural network model of variable displacement pump dynamics. American Society of Mechanical Engineers, The Fluid Power and Systems Technology Division (Publication) FPST, 4, 71-76.