为了使势能回收再利用液压系统能够适用于实际作业中诸多工况,提出了一种应用于该系统的控制策略。以90t港口移动式高架起重机为例,归纳了工况的特点,给出了势能回收再利用液压系统的原理图,进而建立了AMESim-Simulink联合仿真模型,并确立了以蓄能器压力和二次元件排量为判断参数的控制策略。该控制策略设立了蓄能器压力和二次元件排量的各自上、下限,在作业过程中通过比较蓄能器实时压力、二次元件实时排量与其各自限值,实现节能回路和主回路接入与退出的自动控制。仿真结果表明,该控制策略在变蓄能器初始工作压力、变负载大小、变负载起降高度的诸多作业工况下,均能实现合理的势能回收与再利用,提高了势能回收再利用液压系统在实际应用中的普适性。
Abstract
In order to apply the hydraulic system for potential energy recycling at different practical operating conditions, a control strategy is developed. We take 90 t mobile harbour crane as the example, conclude its characteristic of practical operating conditions, give the schematic diagram of the hoist mechanism's hydraulic system for potential energy recycling is given, and build the AMESim-Simulink co-simulation model and propose the control strategy by using the accumulator pressure and secondary element displacement as judgment parameters. The superior and inferior limits of the accumulator pressure and the secondary element displacement are set in the control strategy respectively. The access and the exit of the energy-saving circuit and the main circuit are automatically switched according to the comparison among the current value and the limit of the accumulator pressure and the secondary element displacement during the work. The simulation results indicate that the control strategy can achieve reasonable potential energy recycling in practical operating conditions with a variable accumulator initial working pressure, a variable load size and a variable landing height. The control strategy can improve the universality of the hydraulic system. 收稿日期:2017-02-20 基金项目:国家科技支撑计划(2015BAF07B01);辽宁省高校创新团队支持计划(LT2014001) 作者简介:王欣(1972—),女,天津人,副教授,博士,主要从事结构损伤与剩余寿命评估、重型装备现代设计理论与方法、复杂结构CAD与智能计算的科研和教学工作。
关键词
液压系统 ;
势能回收再利用 ;
系统建模 ;
控制策略
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Key words
hydraulic system ;
potential energy recycling ;
system modeling ;
control strategy
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基金
国家科技支撑计划(2015BAF07B01);辽宁省高校创新团队支持计划(LT2014001)
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