通过对某拉机驾驶室进行NTF(Noise Transfer Function)分析,找出了该驾驶室NTF曲线在48 Hz处出现明显峰值,并对该驾驶室进行了板件贡献量和模态分析,找出了对应NTF峰值最大贡献板件为顶盖和前围板,并对前围板进行了结构优化和验证,使该...通过对某拉机驾驶室进行NTF(Noise Transfer Function)分析,找出了该驾驶室NTF曲线在48 Hz处出现明显峰值,并对该驾驶室进行了板件贡献量和模态分析,找出了对应NTF峰值最大贡献板件为顶盖和前围板,并对前围板进行了结构优化和验证,使该驾驶室NTF曲线峰值降低了3.7 dB。该方法可以有效降低拖拉机驾驶室的结构低频噪声,改善其NVH性能。展开更多
For the problem of sensor faults and actuator faults in aircraft attitude control,this paper proposes a fault tolerant control(FTC)scheme based on extended state observer(ESO)and nonlinear dynamic inversion(NDI).First...For the problem of sensor faults and actuator faults in aircraft attitude control,this paper proposes a fault tolerant control(FTC)scheme based on extended state observer(ESO)and nonlinear dynamic inversion(NDI).First,two ESOs are designed to estimate sensor faults and actuator faults respectively.Second,the angular rate signal is reconstructed according to the estimation of sensor faults.Third,in angular rate loop,NDI is designed based on reconstruction of angular rate signals and estimation of actuator faults.The FTC scheme proposed in this paper is testified through numerical simulations.The results show that it is feasible and has good fault tolerant ability.展开更多
文摘通过对某拉机驾驶室进行NTF(Noise Transfer Function)分析,找出了该驾驶室NTF曲线在48 Hz处出现明显峰值,并对该驾驶室进行了板件贡献量和模态分析,找出了对应NTF峰值最大贡献板件为顶盖和前围板,并对前围板进行了结构优化和验证,使该驾驶室NTF曲线峰值降低了3.7 dB。该方法可以有效降低拖拉机驾驶室的结构低频噪声,改善其NVH性能。
基金supported by the Chinese Aviation Science Fund(20160757001)the National Natural Science Foundation of China(10577012)。
文摘For the problem of sensor faults and actuator faults in aircraft attitude control,this paper proposes a fault tolerant control(FTC)scheme based on extended state observer(ESO)and nonlinear dynamic inversion(NDI).First,two ESOs are designed to estimate sensor faults and actuator faults respectively.Second,the angular rate signal is reconstructed according to the estimation of sensor faults.Third,in angular rate loop,NDI is designed based on reconstruction of angular rate signals and estimation of actuator faults.The FTC scheme proposed in this paper is testified through numerical simulations.The results show that it is feasible and has good fault tolerant ability.