风洞模型角度调节机构的动态特性分析

Dynamic Characteristics Analysis of an Angle Adjusting Mechanism of Wind Tunnel

为了验证风洞模型角度调节机构以某种频率工作时,机械系统的惯量、刚性及阻尼对试验结果是否有影响,建立了角度调节机构的动力学方程及相对应的数学模型,并用MATLAB/SIMULINK软件进行动态特性分析;机构中构件存在惯性,并且具有一定的刚性及阻尼,由于风洞模型角度调节机构是一种精度要求较高的系统,为保证计算结果的准确性,在建立角度调节机构的动力学方程时必须考虑这些因素;当角度调节机构处于极限工况时,仿真结果表明:模型输出轴的角位移动态响应曲线基本上与期望曲线重合,只存在极小的误差,机械系统的惯量、刚性及阻尼对试验结果的影响是极小的。

In order to verify whether moment of inertia, stiffness and damping of mechanical system have impact on the test results when the wind tunnel model Angle adjusting mechanism works in a certain frequency, to establish the dynamics equation of Angle adjusting mechanism and the corresponding mathematical model, MATLAB/SIMU LINK software was used to analyze dynamic characteristics. The components in institutions have inertia, stiffness and damping, due to the angle adjusting mechanism of wind tunnel is a kind of high accuracy system. In order to guarantee the accuracy of the calculation results, the dynamic equation of forced vibration device must take into ac count these factors. When the angle adjusting mechanism is in extreme conditions, the simulation results show that the model output shaft angular displacement of the dynamic response curve and expected curve basically coinci dence. There are only a tiny error, moment of inertia, stiffness and damping of mechanical system impact on the test results is limited.