CAJ | 학술논문

针对磁流变阻尼器随工作温度变化导致阻尼力发生改变，进而降低磁流变悬架系统性能的问题，基于传热学方程和参数慢变非线性振动理论研究温度变化对磁流变非线性悬架系统的主共振动力学行为的影响。根据传热学理论建立磁流变阻尼器工作区域能量微分方程，用数值方法求出温度变化规律，用改进的Bingham模型计算磁流变阻尼力；建立慢变参数磁流变非线性悬架系统动力学方程，利用平均法求解主共振激励下的悬架动行程的稳态幅值响应。研究表明：随着运行时间增加，磁流变阻尼器的温度逐渐升高，导致磁流变阻尼力大幅降低，悬架动行程稳态振幅及其变化量越大，从而使得悬架系统的性能偏离设计目标。
침대자류변조니기수공작온도변화도치조니력발생개변，진이강저자류변현가계통성능적문제，기우전열학방정화삼수만변비선성진동이론연구온도변화대자류변비선성현가계통적주공진동역학행위적영향。근거전열학이론건립자류변조니기공작구역능량미분방정，용수치방법구출온도변화규률，용개진적Bingham모형계산자류변조니력；건립만변삼수자류변비선성현가계통동역학방정，이용평균법구해주공진격려하적현가동행정적은태폭치향응。연구표명：수착운행시간증가，자류변조니기적온도축점승고，도치자류변조니력대폭강저，현가동행정은태진폭급기변화량월대，종이사득현가계통적성능편리설계목표。
The output damping force of a magneto-rheological (MR)damper is reduced with increase in working temperature.As a result,the performance of a MR suspension system is degraded.On the basis of the theory of heat transfer and nonlinear vibration,the main resonance of a MR suspension dynamic system with slowly varying parameters was analyzed here.The energy differential equations at the working area of the MR damper were established and solved with the numerical method.The modified Bingham model was applied to calculate the output damping force of the MR damper.The nonlinear dynamic equation of the MR suspension system with slowly varying parameters was formulated.The steady amplitude response of the MR suspension system under the excitation of main resonance was solved with the averaging method.The calculated results showed that the working temperature rises with increase in running time of the MR damper,consequently,the output damping force of the MR damper decreases significantly and the vibration amplitude variation of the suspension system increases,the performance of the MR suspension system is degraded.