| Mechanical and Energy Engineering |
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| Blank holder force control of hydraulic cushion with soft relief fuzzy PID controller |
| ZHANG Qiang, WEI Jian-hua, SHI Wen-zhuo |
| State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou 310027, China |
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Abstract An open/closed loop switching-based soft relief PID (SPID) controller was presented in view that the proportional relief valve-controlled hydraulic cushion has large pressure overshoot and long adjusting time in the stamping process. The SPID controller could significantly reduce the pressure overshoot and shorten the adjusting time under the premise of ensuring steady state accuracy. Considering the inherently strong nonlinearities of the electro-hydraulic system, as well as the significant influence of different pressure instructions and stamping speeds on the pressure response of the hydraulic cushion, a soft relief fuzzy PID (SFPID) was further proposed. On the basis of SPID controller, the SFPID controller further introduced the fuzzy controller to adjust the control parameters on-line, so as to guarantee that the hydraulic cushion had good dynamic and static responses under different pressure instructions and stamping speeds. Both the simulation and experiment results validate the effectiveness of the proposed SFPID controller in the blank holder force control of hydraulic cushion.
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Published: 11 June 2017
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Cite this article:
ZHANG Qiang, WEI Jian-hua, SHI Wen-zhuo. Blank holder force control of hydraulic cushion with soft relief fuzzy PID controller. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2017, 51(6): 1143-1152.
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采用软溢流模糊PID控制器的液压垫压边力控制
鉴于比例溢流阀控式液压垫在冲压成形过程中存在压力超调大及调节时间长的问题,提出一种基于开/闭环切换的软溢流PID(SPID)控制器.该SPID控制器能够在保证稳态精度的前提下,显著减小压力超调并且缩短压力调节时间.考虑到电液控制系统固有的强非线性特点,以及不同压力指令和冲压速度对液压垫的压力响应带来的显著影响,提出一种软溢流模糊PID(SFPID)控制器.SFPID控制器在SPID控制器的基础上引入模糊控制器对控制参数进行在线调整,从而保证液压垫在不同的压力指令和冲压速度下都具有良好的动静态响应.仿真和实验结果都证明了SFPID控制器在液压垫压边力控制方面的有效性.
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