带定压活门的液压阻尼器建模因素分析

发布时间：2018-05-06 11:57

本文选题：液压阻尼器 + 定压活门　；参考：《工程科学与技术》2017年06期

【摘要】：针对现有带定压活门的液压阻尼器模型考虑因素不同、形式不统一等问题,通过分析油液含气和压缩性、阀口液动力、阀口流量系数和等效面积、串油管路阻力和管路部分油液压缩性等因素对液压阻尼器等效阻尼及阻尼力峰值的影响,建立了液压阻尼器定压活门内置与外接时统一的力学模型。将某型带定压活门的液压阻尼器在1、9、26 mm共3种不同激振幅值下等效阻尼及阻尼力峰值的计算结果与实验值进行对比,结果显示,等效阻尼误差分别为 9.994 5%、0.672 4%和 2.757 2%,阻尼力峰值误差分别为 0.457 4%、1.973 3%和 4.074 9%,该结果验证了所建力学模型的准确性。在进行影响因素分析时发现,油液体积弹性模量在低压时对含气量较为敏感,随着含气量的增加急速下降,弹性模量的改变对等效阻尼和阻尼力峰值均有较大影响,特别是在激振幅值较小的情况下表现更明显;阀口液动力对定压活门开启后的阻尼力峰值影响较大,而对等效阻尼的影响较小;阀口流量系数取常量且阀口等效面积简化成阀芯位移的一次函数后对等效阻尼及阻尼力峰值基本没有影响;定压活门外接时,串油管路阻力和管路部分油液压缩性对等效阻尼和阻尼力峰值的影响都不大。
[Abstract]:In view of the existing hydraulic damper model with constant pressure valve considering different factors and different forms, the gas and compressibility of oil, the power of valve, the flow coefficient of valve and the equivalent area are analyzed. The influence of the factors such as pipeline resistance and oil compressibility on the equivalent damping and the peak damping force of the hydraulic damper are discussed. The mechanical model of the hydraulic damper with the internal and external connection of the fixed pressure valve is established. The calculated results of equivalent damping and peak damping force of a hydraulic damper with a constant pressure valve under three different excitation amplitudes of 926mm are compared with the experimental results. The results show that, The equivalent damping error is 9.994, 0.672% and 2.757 2, respectively, and the peak damping error is 0.457 4% 1.973 3% and 4.074 9%, respectively. The results verify the accuracy of the established mechanical model. It is found that the volume elastic modulus of oil is sensitive to the gas content at low pressure, and with the increase of gas content, the change of elastic modulus has a great influence on the equivalent damping and the peak damping force. Especially when the amplitude of the valve is small, the valve opening fluid power has a great influence on the peak damping force after the valve is opened, but has little effect on the equivalent damping. When the flow coefficient of the valve is constant and the equivalent area of the valve is simplified as the primary function of the displacement of the valve core, the equivalent damping and the peak damping force are not affected basically; when the valve is connected to the outside of the constant pressure valve, The resistance of string tubing and the compressibility of some oil have little effect on the equivalent damping and the peak damping force.
【作者单位】：海军航空大学飞行器工程系;
【基金】：航空科学基金资助项目(20145784010)
【分类号】：TH137.5

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