多场耦合的伺服阀力矩马达衔铁组件振动特性研究

发布时间：2018-01-18 06:00

本文关键词：多场耦合的伺服阀力矩马达衔铁组件振动特性研究　出处：《哈尔滨工业大学》2011年硕士论文　论文类型：学位论文

【摘要】：对于采用射流元件作为前置级的伺服阀,其工作过程中易产生一种高频自激噪声,严重影响了伺服阀的工作性能。伺服阀非线性、力矩马达衔铁组件的受迫振动、前置级流场中的剪切层振荡等是导致伺服阀产生自激噪声的可能因素。因此,研究伺服阀力矩马达衔铁组件的振动特性对揭示高频自激噪声的产生机理具有重要意义。本课题采用仿真和实验相结合的研究方法,对伺服阀力矩马达衔铁组件的振动特性进行研究。建立了衔铁组件的受力数学模型,并详细阐述了模态分析与谐响应分析的基本理论和方法。基于ANSYS软件,建立了不同安装方式下力矩马达衔铁组件的有限元模型。通过模态分析,计算了反馈杆末端约束和自由状态下的固有频率与相应振型,并分析了阀芯、液压弹簧对振动特性的影响,系统研究了衔铁组件的振动规律。在模态分析的基础上进行了衔铁组件与电磁场和流场耦合的谐响应分析,获得了衔铁组件关键点处的谐响应曲线,分析了不同作用力、不同安装方式下衔铁组件振动能量的分布。通过改变电磁力及液压阻尼比的大小,研究了载荷及阻尼对衔铁组件谐响应特性的影响规律。为验证仿真结果,采用激光位移传感器对力矩马达衔铁组件的静、动态特性进行了实验研究,并对比仿真结果进行了误差分析,验证了有限元建模的正确性。本文的研究结果对进一步揭示伺服阀高频自激噪声的产生机理及抑制措施具有重要的参考价值,为今后的研究奠定了理论基础。
[Abstract]:As a servo valve with jet element as a pre - stage , it is easy to produce a high - frequency self - excited noise during its operation , which seriously affects the working performance of the servo valve . The nonlinearity of the servo valve , the forced vibration of the armature assembly of the moment motor and the oscillation of the shear layer in the pre - stage flow field are the possible factors that cause the self - excited noise of the servo valve . Therefore , it is important to study the vibration characteristics of the armature assembly of the servo valve moment to reveal the mechanism of the high - frequency self - excited noise . Based on the analysis of modal analysis , a finite element model of the armature assembly in different installation modes is established . Based on ANSYS software , the influence of load and damping on the vibration energy of armature assembly is analyzed . By changing the electromagnetic force and the hydraulic damping ratio , the static and dynamic characteristics of armature assembly are studied . The research results of this paper have important reference value for further revealing the generation mechanism and restraining measure of the high frequency self - excited noise of the servo valve , which lays a theoretical foundation for future research .

【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH137.52

【引证文献】