伺服阀性能改善及其在地震模拟振动台中的应用
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摘要
电液伺服系统设计中常将伺服阀简化为线性,可实际上伺服阀的性能随流量的大小不同而存在很大差异:小流量时可以近似为线性;随着流量的增大阀传递函数的幅值及90°相移对应频率都成倍降低,流量达到90%左右时,部分伺服阀的频率范围只有60 Hz左右。可为了满足实际控制性能要求,伺服阀频率需要达到控制系统频率范围的2倍以上,对常规伺服阀而言,在较大流量时很难达到这个要求。对伺服阀性能进行了一阶补偿、二阶补偿算法研究,并在此基础上进行了地震模拟振动台应用研究,分析结果表明:一阶补偿和二阶补偿在不改变硬件的条件下均提高了伺服阀性能,二阶补偿效果更好,很好的满足了振动台的应用要求。
Servo valve is simplified as linearity in the designing of electro-hydraulic servo system.It is accurated at low flow,but the performance of servo valve is different from flow volume actually.With increasing flow volume,the frequency at 90°phase decreases dramatically,it is about 60 Hz when flow volume is ninety percent of maximum flow.In order to satisfy the control performance of system,this frequency is demanded to be twice the frequency of system need.It is very hard to meet the need at high flow.First-order and second-order compensation algorithms are adapted in this paper,and their application is investigated in shaking table.The analysis results show that performance of servo valve is improved with both first-order and second-order compensation,except that,second-order compensation is better for the demand of shaking table control system.
Servo valve is simplified as linearity in the designing of electro-hydraulic servo system.It is accurated at low flow,but the performance of servo valve is different from flow volume actually.With increasing flow volume,the frequency at 90°phase decreases dramatically,it is about 60 Hz when flow volume is ninety percent of maximum flow.In order to satisfy the control performance of system,this frequency is demanded to be twice the frequency of system need.It is very hard to meet the need at high flow.First-order and second-order compensation algorithms are adapted in this paper,and their application is investigated in shaking table.The analysis results show that performance of servo valve is improved with both first-order and second-order compensation,except that,second-order compensation is better for the demand of shaking table control system.
引文
[1]黄浩华.地震模拟振动台的设计与应用技术[M].北京:地震出版社,2008.
[2]刘连山,田纪熊.电液伺服阀传递函数的辨识与验证[J].大连海运学院学报,1984,10(3):42-49.
[3]Newell D P,Sain M K,Dai H L,et al.Nonlinear Modeling and Control of a Hydraulic Seismic Simulator[C]//Proceedings ofthe American Control Conference.Washington:[s.n.],1995:801-805.
[4]Shortreed J S,Seible F,Benzoni G.Simulation Issues with a Real-time,Full-scale Seismic Testing System[J].Journal ofEarthquake Engineering,2002(6):185-201.
[5]Chase J G,Hudson N H,Lin J,et al.Nonlinear Shake Table Identification and Control for Near-field Earthquake Testing[J].Journal of Earthquake Engineering,2005,9(4):461-482.
[6]梅里H E.液压控制系统[M].陈燕庆,译.北京:科学出版社,1976.
[2]刘连山,田纪熊.电液伺服阀传递函数的辨识与验证[J].大连海运学院学报,1984,10(3):42-49.
[3]Newell D P,Sain M K,Dai H L,et al.Nonlinear Modeling and Control of a Hydraulic Seismic Simulator[C]//Proceedings ofthe American Control Conference.Washington:[s.n.],1995:801-805.
[4]Shortreed J S,Seible F,Benzoni G.Simulation Issues with a Real-time,Full-scale Seismic Testing System[J].Journal ofEarthquake Engineering,2002(6):185-201.
[5]Chase J G,Hudson N H,Lin J,et al.Nonlinear Shake Table Identification and Control for Near-field Earthquake Testing[J].Journal of Earthquake Engineering,2005,9(4):461-482.
[6]梅里H E.液压控制系统[M].陈燕庆,译.北京:科学出版社,1976.
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