摘要
提出一种在车体和车下设备之间进行主动减振控制的改进方法,该方法主要采用线性二次型最优控制策略和优化技术。首先用扫频法确定车体与车下设备的低阶耦合共振频率为8.2 Hz。然后分别在同步正弦和延迟随机激扰下求解最优控制参数。发现以时域性能为目标时,时域响应幅值能显著降低,但只能在耦合共振频率附近降低振动能量。为克服这一不足,提出以频率性能为目标的控制参数优化方法,所得控制参数能使车体加速度的均方根(Root mean squared,RMS)值降低40%以上。并能在较宽的频段内降低振动能量,恰好弥补了以时域性能为目标的不足。最后分析了参数扰动对控制效果的影响。结果表明,在车体质量±5%的变化范围内,加速度RMS值的降幅在40%以上;轨道激扰增加不超过2%的随机高斯噪声时,加速度RMS值的降幅在10%以上。因此,改进后的方法,不仅能有效降低车体振动,而且具有一定的控制“裕量”,可以保证工况条件劣化后的减振效果。
An improved method for active vibration reduction control between the carbody and underframe equipment is proposed.This method mainly adopts linear quadratic regulator optimal control strategy and optimization technology.First of all,the frequency sweeping method is used to determine the low-order coupling resonance frequency of the carbody and the equipment which is 8.2 Hz.Then,the optimal control parameters are solved under synchronous sinusoidal and delayed random excitations respectively.It is found that when the time-domain performance is the optimization objective,the response can be significantly reduced,but the vibration energy can only be reduced near the coupling resonance frequency.To overcome this shortcoming,a control parameter optimization method with a frequency performance as the target is proposed.The obtained control parameters can reduce the root mean squared(RMS)value of the acceleration of the carbody by more than 40%and reduce the vibration energy in a wide frequency range.It just makes up for the above-mentioned shortcoming.Finally,the influence of parameter disturbance on the control effect is analyzed.The results show that within the range of±5%of the carbody mass,the RMS of acceleration can be reduced by more than 40%.When the track disturbance increases by less than 2%of random Gaussian noise,the reduction of the RMS of acceleration remains above 10%.Therefore,the improved method can not only effectively reduce the vibration of the carbody,but also has a certain control“margin”,which can ensure the damping effect after the working conditions deterioration.
作者
雒耀祥
缪炳荣
陈翔宇
彭齐明
蒋钏应
LUO Yaoxiang;MIAO Bingrong;CHEN Xiangyu;PENG Qiming;JIANG Chuanying(State Key Laboratory of Traction Power,Southwest Jiaotong University,Chengdu 610031,China)
出处
《噪声与振动控制》
CSCD
北大核心
2021年第4期122-128,238,共8页
Noise and Vibration Control
基金
国家自然科学基金面上资助项目(51775456)
牵引动力国家重点实验室自主资助项目(2019TPL_T03)。
关键词
振动与波
高速列车
刚柔耦合
耦合振动
车体减振
主动控制
vibration and wave
high-speed train
rigid-flexible coupling
coupled vibration
carbody vibration reduction
active control
