Modeling and Stability Analysis for Dual-Spinning Projectiles with Canards

To develop the guided spin-stabilized projectiles with high hit precision,a class of dual-spinning stabilized projectile equipped with canards in atmospheric is studied.The 7 degrees of freedom(DOF) nonlinear equations are written in a non-rolling body frame.The work reported here focuses on the ballistic property analysis including the spin rates,incidence angle,ballistic drift and lateral velocity.The dual-spinning projectiles are fundamentally less stable than conventional spin-stabilized projectiles.Hence,the gyroscopic stability is also studied in this paper.Theoretical models are given in this work,and the results of numerical analysis are discussed.

爆胎车辆稳定性控制的模糊PID控制研究

为了使汽车在爆胎后能继续维持爆胎前的行驶状态,对其稳定性控制做了一些研究工作。首先,建立轮胎模型,汽车二自由度理想模型、七自由度实际模型。其次,将FPID运用在爆胎汽车的稳定性控制上,以两模型的横摆角速度偏差(E)及偏差变化率(EC)作为FPID控制器的输入,决策出用以维持爆胎汽车的稳定性的最优附加横摆力矩。最后对所提的FPID控制进行仿真验证。结果表明:FPID控制可以降低爆胎汽车横摆角速度的变化幅度,保证了高速行驶中爆胎车辆的稳定性。

七自由度机器人振动抑制的新方法

针对七自由度工业机器人刚性较差,运动过程中容易产生振动且抑制困难的问题,提出了一种控制算法,将时滞整形滤波器与动力学前馈补偿组合在一起,对机器人两个关节采用时滞滤波,并同时采用基于简化动力学模型的前馈补偿来实现机器人振动抑制。