【摘要】 将三轴鞍式半挂车简化为七自由度动力学系统,在随机激励输入的条件下,采用现代控制理论中的状态空间法,直接求解汽车系统在时域内的动态响应;利用数字滤波和加窗技术,经快速傅里叶变换(FFT)求得系统在频域内的振动响应。该方法计算速度快、精度高,在汽车行驶平顺性的分析和研究中,具有一定的实用价值。更多还原

【Abstract】 A three-axle semi-trailer is able to be simplified as a dynamic system with 7 degree of freedom. Applying the state-space method in modern control theory, the dynamic response of automobile system in time domain under random excitation can be directly solved, then using digital filtering and windowing technique and through fast Fourier transform algorithm (FFT), the vibration response of the system in frequency domain can be consquently obtained. This way has the advantage of high calculation speed, high accuracy and favourable practicability in studying riding comfort of automobiles.更多还原