振动环境下2D电液比例伺服换向阀动静态特性的研究
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摘要
针对振动环境下的液压系统对可靠的高压大流量比例伺服换向阀的需求,及实际高端液压系统中的新要求,提出了一种紧凑型大流量2D电液比例伺服换向阀。分析了该阀的螺旋伺服机构工作原理,建立了数学模型,推导了导控级流量方程,并基于振动环境下推导了主阀芯的力学平衡方程,利用Matlab进行了动态响应仿真分析,进行了静动态特性相关实验。研究结果表明:仿真分析、数学解析与实验三者所得到的结果基本吻合;并且在振动环境下叠加颤振后,滞环为2. 9%,且静态特性良好,对应-3 d B、-90°的频宽约为85 Hz,动态特性基本符合设计要求,振动可靠性良好。
In order to solve the need of reliable high pressure and large flow proportional servo directional valve for hydraulic system under vibration environment and the new requirements of actual high end hydraulic system,the compact 2D electro hydraulic proportional servo directional valve with large flow rate was proposed. The working principle of the spiral servo mechanism of the valve was analyzed,the mathematical model was established,the flow equation of the guide control stage was derived,and the mechanical balance equation of the main valve core was derived based on the vibration condition,and the dynamic response simulation analysis was carried out by using Matlab. Experiments on static and dynamic characteristics were carried out. The experimental results show that simulation analysis,mathematical analysis and experimental results are basically consistent. Under the vibration environment,the hysteresis loop is 2. 9% and the static characteristic is good. The bandwidth corresponding to-3 d B,-90 °is about 85 Hz. The dynamic characteristic basically accords with the design requirement,the vibration reliability is good.
In order to solve the need of reliable high pressure and large flow proportional servo directional valve for hydraulic system under vibration environment and the new requirements of actual high end hydraulic system,the compact 2D electro hydraulic proportional servo directional valve with large flow rate was proposed. The working principle of the spiral servo mechanism of the valve was analyzed,the mathematical model was established,the flow equation of the guide control stage was derived,and the mechanical balance equation of the main valve core was derived based on the vibration condition,and the dynamic response simulation analysis was carried out by using Matlab. Experiments on static and dynamic characteristics were carried out. The experimental results show that simulation analysis,mathematical analysis and experimental results are basically consistent. Under the vibration environment,the hysteresis loop is 2. 9% and the static characteristic is good. The bandwidth corresponding to-3 d B,-90 °is about 85 Hz. The dynamic characteristic basically accords with the design requirement,the vibration reliability is good.
引文
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[13]ZHAO J,LIU L.Influence of reversing impact load on performance of a two-step unloading pilot-operated check valves[J].Journal of the Brazilian Society of Mechanical Sciences&Engineering,2018,40(6):295
[2]满在朋,丁凡,刘硕,等.大流量电液控制阀设计与试验[J].农业机械学报,2015,46(1):345-351.
[3]朱剑,尹文庆,谢蓓.基于嵌入式的电液比例控制系统在联合收割机割台高度控制中的应用[J].液压与气动,2012(1):83-86.
[4]李胜,阮健,孟彬.二维电液比例换向阀动态特性及稳定性分析[J].机械工程学报,2016,52(2):202-212.
[5]左强,李胜,阮健.2D电液比例方向阀弹性压扭联轴器研究[J].农业机械学报,2014,45(5):327-333.
[6]邹亮,胡光忠,文华斌,等.不同弹簧刚度系数下单向阀关闭过程仿真[J].流体机械,2017(11):55-59.
[7]左强,陆倩倩,李胜,等.滚珠丝杠压扭型2D电液比例方向阀静态特性研究[J].农业机械学报,2017,48(8):368-375.
[8]KUMAGAI K,RYU S,OTA M,et al.Investigation of poppet valve vibration with cavitation[J].International Journal of Fluid Power,2016,17(1):15-24.
[9]刘国印.装载机液压系统动态性能仿真研究[D].厦门:集美大学轮机工程学院,2010.
[10]刘国文,金亮亮,路瑶,等.电液比例换向阀的发展概况及前景展望[J].液压气动与密封,2018(3):1-4.
[11]盖超会,双向冲击气缸内嵌三位五通换向阀动态特性研究[J].机械,2016(11):16-19,53.
[12]张怀亮,章国亮,齐征宇.基础振动下直动式溢流阀的动态特性[J].中南大学学报:自然科学版,2014(12):4181-4186
[13]ZHAO J,LIU L.Influence of reversing impact load on performance of a two-step unloading pilot-operated check valves[J].Journal of the Brazilian Society of Mechanical Sciences&Engineering,2018,40(6):295