【作者】 陈建；

【导师】 王广林；

【作者基本信息】 哈尔滨工业大学 ， 机械工程（专业学位）， 2021， 硕士

【摘要】 电液伺服阀中弹性组件的刚度参数直接影响到伺服阀的控制性能。弹性组件由弹性元件弹簧管和反馈杆以及刚性元件挡板和衔铁组成,也被称为衔铁组件。现有弹性组件综合刚度测量装置是在反馈杆球头自由夹紧和衔铁两臂纯力偶加载下进行测量,但是由于传动间隙和传动摩擦的存在,使得测量精度较低,未能实用化。本文将改进弹性组件综合刚度的测量方法,提高测量系统的精度和效率,并适应多型号弹性组件的综合刚度测量要求。首先,本文提出了弹性组件有效综合刚度和测量综合刚度两种定义。基于力矩马达的受力状态推导了组件有效综合刚度的理论公式。根据衔铁变形分析,明确了弹性组件测量综合刚度与有效综合刚度的关系。通过仿真分析了反馈杆球头非自由夹紧和衔铁两臂非纯力偶加载对组件综合刚度测量的影响,确定了双臂独立对称加载的综合刚度测量方法。其次,本文对弹性组件的加载机构和定位夹紧机构进行了结构设计;选用平行梁式力传感器和差动电感式位移传感器对组件两臂的载荷和位移进行测量,完成了二次仪表电路的调试;并利用Labview软件进行输出信号的采集和综合刚度的计算。最后,搭建了新的综合刚度测量系统,通过传感器的标定保证两臂测量的对称性;进行了综合刚度测量的影响因素试验,确定了测量规范;并对两个不同型号组件进行综合刚度测量试验,评估了测量系统的性能;然后,通过衔铁变形试验验证了弹性组件测量综合刚度与有效综合刚度的关系。更多还原

【Abstract】 The stiffness parameter of the elastic component in electro-hydraulic servo valve directly affects the control performance of the servo valve.The elastic component,also known as armature component,consists of elastic elements spring tube and feedback rod and rigid elements baffle and armature.The existing comprehensive stiffness measurement device of the elastic component was measured under the free clamping of the ball head of the feedback rod and the pure force coupling loading of the two arms of the armature,but the existence of transmission gap and transmission friction maked the measurement accuracy low and failed to be practical.In this paper,the measurement method of the comprehensive stiffness of elastic component will be improved to enhance the accuracy and efficiency of the measurement system and to adapt to the requirements of comprehensive stiffness measurement for multi-model elastic component.Firstly,this paper proposes two definitions of the effective and measured comprehensive stiffness of the elastic component.The theoretical equation of the effective comprehensive stiffness of the component is derived based on the force state of the torque motor.Based on the analysis of armature deformation,the relationship between the measured comprehensive stiffness and the effective comprehensive stiffness of the elastic component is clarified.The effect of non--free clamping of the feedback rod ball head and non-pure force couple loading of the armature on the measurement of the comprehensive stiffness of the component is analyzed by simulation,and the comprehensive stiffness measurement method with independent symmetric loading of double arms is determined.Secondly,the structural design of the loading mechanism and positioning clamping mechanism of the elastic component is carried out;the parallel beam force transducer and differential inductive displacement transducer are selected to measure the load and displacement of the two arms of the component,and the commissioning of the secondary instrumentation circuit is completed;and the Labview software is used to collect the output signal and calculate the comprehensive stiffness.Finally,a new comprehensive stiffness measurement system is built,and the symmetry of the two arms measurement is ensured by the calibration of the transducer;the comprehensive stiffness measurement influence factor test is conducted to determine the measurement specification;and the comprehensive stiffness measurement test is conducted on two different models of the component to evaluate the performance of the measurement system;then the relationship between the measured comprehensive stiffness of the elastic component and the effective comprehensive stiffness is verified by armature deformation tests.更多还原