摘要
针对开式泵控锻造油压机卸压过程剧烈的冲击振动问题,提出以弯管受力为判断依据,利用灵敏度分析方法探寻影响卸压冲击振动的主要参数。分析泄压冲击产生机理,建立系统卸压储能数学模型和弯管受力模型,得到变量泵控制流量、系统储能以及弯管受力之间的函数关系。采用一阶输出灵敏度分析方法,求出各参数在组合式卸压曲线控制下的灵敏度函数,并提出峰值灵敏度、均值灵敏度两个衡量指标,分析各参数变化对弯管受力影响规律,得到引起卸压冲击的决定性参数。研究结果表明:在影响系统冲击振动的8个主要参数中,主缸初始压力、主缸面积及卸压弯管通流面积依次为引起系统卸压冲击的关键参数。上述研究结论及方法不仅为开式泵控锻造油压机卸压控制优化提供了理论依据,也为振动主次因素分析提供了新方法。
For the problem of shock and vibration in the decompression process of open circuit pump-controlled forging hydraulic press, based on the force of the bend, the main parameters of the vibration which influences the release of decompression are explored by sensitivity analysis. Mechanism of its decompression shock is analyzed. The mathematics model of energy storage during system depression and the force model of the bend are established and the function relation between flow rate of variable pump, system energy storage and the force of bend is also obtained. A first order output sensitivity analysis method is used to calculate that sensitivity function of the parameter under the control of the combined pressure relief curve. Two measures of peak sensitivity and mean sensitivity are proposed to analyze the influence degree of each parameter variation on the force of the bend. The conclusions show that among the eight main parameters affecting the decompression shock of the system, the initial pressure of the working cylinder, working cylinder area and flow area of decompression bend are main influence factors. The above conclusions and methods not only provide a theoretical basis for the system control optimization, but also provide a new method for the analysis of vibration principal and secondary factors.
作者
汪飞雪
蒋东廷
田月
孔令雨
姚静
Wang Feixue;Jiang Dongting;Tian Yue;Kong Lingyu;Yao Jing(Hebei Province Key Laboratory of Heavy Machinery Fluid Power Transmission and Control, Qinhuangdao 066004;Key Laboratory of Advanced Forging & Stamping Technology and Science, Ministry of Education of China, Qinhuangdao 066004;College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004)
出处
《高技术通讯》
EI
CAS
北大核心
2019年第4期379-386,共8页
Chinese High Technology Letters
基金
国家自然科学基金(51575471)
河北省自然科学基金(E2017203127
E2018203028)资助项目
关键词
冲击振动
灵敏度分析
泵控系统
液压机
shock vibration
sensitivity analysis
pump-controlled system
hydraulic press
