排序方式: 共有22条查询结果,搜索用时 437 毫秒
1.
Zheng Li 《哈尔滨工业大学学报(英文版)》2013,20(2):99-105
This paper mainly presents a PM multi-DOF actuator for robot in-wheels drive applications and its control method. The torque model is established based on the finite-element model of the single pair poles in 3D finite element method software. Due to the special structure of the actuator, the Euler angles are adopted for deriving the kinematics and dynamic model. To reduce the effects of uncertainties of modeling error, nonlinear friction and external disturbances in the system, an approximation of neural network adaptive control method is applied to the actuator. The computation and simulation results show that the proposed analysis and control method can effectively derive the characteristics and improve the motion performance, which provides the primary theoretical guide for the configuration design, optimization and control research of multi-DOF deflection type actuators. 相似文献
2.
根据新型电液伺服阀的驱动要求,设计了叠堆式超磁致伸缩致动器(SGMA),为补偿其固有的非线性,提高位移输出精度,研究了SGMA的控制策略,并对控制策略进行了仿真和实验验证。首先,采用永磁体和GMM棒交替排布的结构形式设计了SGMA,有助于提高偏置磁场的均匀性;然后,根据SGMA的结构特点,将其视为多自由度振动系统,建立了系统的位移输出模型;接着,在输出模型的基础上,结合模型预测控制与滑模控制策略,设计了模型预测滑模控制器;最后,进行了控制策略仿真和实验验证。实验结果表明,模型预测滑模控制器能够实现SGMA的精密控制。在阶跃控制实验中,系统稳定时间低于1.5ms,无超调和稳态误差;在正弦控制实验中,系统最大控制误差约为0.83μm,相对值约为6.9%,证明了控制策略的有效性。 相似文献
3.
4.
5.
The discrete harmonic linearization method which is applicable to stochastic systems could not provide an equivalent stiffness coefficient for a nonlinear restoring element. In this paper, this technique is generalized to obtain linear representations of both nonlinear restoring and damping elements, based on a principle of energy similarity of dynamic elements. A numerical iterative procedure is presented to compute the local linear coefficients of nonlinear dynamic elements. A nonlinear system is then represented by a set of its complex frequency response function matrices, as functions of the excitation frequency. Stochastic analysis of general multi-DOF nonlinear vehicle systems is established in terms of response PSD characteristics. 相似文献
6.
Working capacity refers to the velocity output and force output of a manipulator. It is usually be represented by output capacity space. In this paper, the method of Linear Programming and a geometric method are proposed to calculate working capacity spaces in different situations. With the consideration of gravity effect of every component, the output force capacity space of heavy duty manipulators is calculated. The results show that the effect of the gravity is a translation of the capacity space. This paper gives a method for the output capacity express especially for heavy duty manipulators. The output capacity space can be helpful to the driving parameters selection. With the consideration of the gravity effect of every component and the friction at the joints, the excavating force capacity space of the heavy-load excavating mechanism is calculated and is represented as a multi-dimensional polytope. The results show that the effect of the gravity and friction is to translational act on the capacity space. 相似文献
7.
卫星太阳翼板面水平展开试验方法 总被引:5,自引:1,他引:5
为减少卫星姿态翻转,确保卫星光学载荷指向精度,提出卫星太阳翼板面水平展开试验方法.采用多自由度配重悬挂法抵消太阳翼水平展开试验过程中的重力,开展运动学及动力学分析、试验误差分析,完成卫星太阳翼板面水平展开试验验证.试验结果表明:相比传统展开试验方法,能够更真实的模拟太阳翼在轨展开运动;对太阳翼配重质量偏差、太阳翼吊挂质心偏差及系统摩擦力控制要求高.验证模型和试验方法的正确性,满足卫星太阳翼展开试验要求. 相似文献
8.
利用有限元法,对多轴系舰载雷达天线稳定转台系统动态特性进行了分析。天线稳定转台系统为复杂的多自由度弹性系统,利用子结构法对天线稳定转台系统各部件进行模态分析,通过边界条件耦合形成系统分析结果。计算了舰载雷达天线稳定转台系统在受到伺服驱动系统的激励下天线面阵的响应。 相似文献
9.
多自由度电液伺服系统动态特性研究 总被引:2,自引:2,他引:0
本文以某多自由度电液伺服系统为研究对象,在考虑系统惯性负载、弹性负载和摩擦力负载等因素下,建立该系统的传递函数模型,并用Matlab对系统进行仿真,通过仿真仔细研究主要参数对系统动态特性的影响,提出改善系统响应的办法. 相似文献
10.
龙运佳 《中国工程机械学报》2012,10(1):29-31
解析动力学DD(Dissecting Dynamics)是以动能与功率之间的关系,真实刻划多自由度系统动力学方程的力学原理.DD适于科技人员应用. 相似文献