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1.
It is an innovative try to control hypersonic bank-to-turn missiles using the deflectable nose and flaps. The higher control efficiency, faster response, better stability and compactness of the nose control are shown by comparing the deflectable nose control with the normal tail fin control. A mathematical model of the missile, which is time-varying, nonlinear and strong coupling, is establihsed by multi-body dynamics to be used for designing the controller. A rohust controller of deflectable nose control is designed by variable structure control theory, selecting sliding mode surfaces with tracking error and its integral function, and considering parameter disturbance of the model. The simulation results show the controller can response quickly and track precisely. The deflectable nose control is proper for the bank-to-turn missile.  相似文献   

2.
Aiming at the guidance problem under impact angle constraint for homing missile against ground targets,a new adaptive robust nonlinear terminal guidance law was proposed in this paper.According to nonlinear kinetic relationship between the missile and target in vertical plane,a mathematic model was formulated while the motion of target and the system structure perturbation were regarded as limited disturbances.Based on the ideas of zeroing the rate of line-of-sight(LOS)angle and the impact angular tracking error,a nonlinear control strategy was contrived to obtain adaptive robust guidance law by adopting Nussbaum-type gain technique under a desired impact angle.The stability of guidance system in finite time is strictly proven by using Lyapunov stability theory.Finally,the numerical simulation verifies the effectiveness of the proposed scheme.  相似文献   

3.
The nonlinear dynamic model of spinning ballistic missiles is established during the first boosting phase of the missile. Based on the conventional backstepping sliding mode control and the assumption of a two time-scale separation of missile dynamics, a graded sliding mode controller is designed with two sub-sliding surfaces which have invariability to external disturbances and parameter perturbations, and a matrix which comprises three first order low pass filters is introduced to prevent "explosion of terms". Owing to the upper bounds of the uncertainties are difficult to obtain in advance, adaptive laws are introduced to estimate the values of the uncertainties in real-time. Eventually, the numerical simulation results given to show the proposed controller can ensure the steady flight of missiles.  相似文献   

4.
A flight control system is designed for a reusable launch vehicle with aerodynamic control surfaces and reaction control system based on a variable-structure control and neural network theory.The control problems of coupling among the channels and the uncertainty of model parameters are solved by using the method.High precise and robust tracking of required attitude angles can be achieved in complicated air space.A mathematical model of reusable launch vehicle is presented first,and then a controller of flight system is presented.Base on the mathematical model,the controller is divided into two parts:variable-structure controller and neural network module which is used to modify the parameters of controller.This control system decouples the lateraldirectional tunnels well with a neural network sliding mode controller and provides a robust and de-coupled tracking for mission angle profiles.After this a control allocation algorithm is employed to allocate the torque moments to aerodynamic control surfaces and thrusters.The final simulation shows that the control system has a good accurate,robust and de-coupled tracking performance.The stable state error is less than 1°,and the overshoot is less than 5%.  相似文献   

5.
In the process of missile large attack angle reentry, there exist nonlinear, strong coupling uncertainty and muhiinput-multi-output (MIMO) in the movement equations, so the traditional small disturbance faces difficulties. For such situations, the method of feedback linearization is adopted to control the complex system, and the control method based on the fuzzy adaptive nonlinear dynamic inversion decoupling control of missile is proposed in the paper. According to the principle of time-scale separation, the system is separated into fast loop and slow loop, the method of dynamic inversion is applied to them, and the method of adaptive fuzzy approach is adopted to compensate for the uncertainty of the fast loop. The simulation results denote the. control method in the paper has a better tracing characteristic and robustness.  相似文献   

6.
A new type of PID controller is introduced and .some properties are given. The novelty of the proposed controller consists in the extension of derivation and integration order from integer to non-integer order. The PI^λD^μ controller generally has three advantages when compared to the integerl-order controller: the first is that it has more degrees of freedom in the model; the second is that it has a memory in model, the memory insure the history and its impact to present and future, the third is it ensures the stability of missile. This approach provides a more flexible tuning strategy and therefore an easier achieving of control requirements. Flight dynamic model of an aerodynamic missile is taken into account in implementing the PI^λD^μ controller. Simulation results show that the PI^λD^μ controller is not sensitive to the changes of control parameters and the system parameters. Also, the controller has more flexible structure and stronger robustness.  相似文献   

7.
A new type of PID controller is introduced and some properties are given. The novelty of the proposed controller consists in the extension of derivation and integration order from integer to non-integer order. The PIλDμ controller generally has three advantages when compared to the integerl-order controller: the first is that it has more degrees of freedom in the model; the second is that it has a memory in model, the memory insure the history and its impact to present and future, the third is it ensures the stability of missile. This approach provides a more flexible tuning strategy and therefore an easier achieving of control requirements. Flight dynamic model of an aerodynamic missile is taken into account in implementing the PIλDμ controller. Simulation results show that the PIλDμ controller is not sensitive to the changes of control parameters and the system parameters. Also, the controller has more flexible structure and stronger robustness.  相似文献   

8.
An agile missile with tail fins and pulse thrusters has continuous and discontinuous control inputs. This brings certain difficulty to the autopilot design and stability analysis. Indirect robust control via Theta-D technique is employed to handle this problem. An acceleration tracking system is formulated based on the nonlinear dynamics of agile missile. Considering the dynamics of actuators, there is an error between actual input and computed input. A robust control problem is formed by treating the error as input uncertainty. The robust control is equivalent to a nonlinear quadratic optimal control of the nominal system with a modified performance index including uncertainty bound. Theta-D technique is applied to solve the nonlinear optimal control problem to obtain the final control law. Numerical results show the effectiveness and robustness of the proposed strategy. Copyright . 2014, China Ordnance Society. Production and hosting by Elsevier B.V. All rights reserved.  相似文献   

9.
The paper presents an output feedback controller design method for high-order servo system with the constraints of multiple indices by using satisfactory control theory. The control strategy is to convert transfer-function form of two-loop servo system into state-space form and assign the system poles in the specified region and H∞ attenuation degree in the given range with the Riccati matrix inequality so that the closed-loop system has good dynamics and robust quality. A numeric example is given to show the effectiveness of the proposed approach.  相似文献   

10.
An attitude control algorithm for reusable launch vehicle (RLV) in reentry phase is proposed based on sliding mode variable structure control technique. The aerodynamic characteristics of RLV vary rapidly, and the serious uncertainties and nonlinearities exist in the reentry flight phase. As an example, American X-34 technology demonstrator is investigated. The chattering brought by the variable structure control technique is eliminated efficiently by choosing a suitable reaching law and a sign function. A control mode of reaction control system is presented based on the RCS scheme of X-34 vehicle. As two different attitude control effectors, aerosurfaces and RCS, are employed in the reentry flight phase, a composite control strategy based on the dynamic pressure variety is presented. Also, an actuator model and a RCS thruster model are built. Analysis and nonlinear simulation results show that the sliding mode variable structure controller achieves better performance, the overshoot and steady-state error are only 0.7% and 0.04° respectively.  相似文献   

11.
提出一种应用反演法来设计导弹的姿态控制律,该控制律能够提高非线性系统的鲁棒性。在设计过程中,首先介绍了反演设计方法从第1步到第n步的设计步骤;然后,将导弹姿态角度作为提出的姿态控制律的控制对象,并根据给定的俯仰角、偏航角和滚转角作为参考信号,得到相应的舵偏输入,使导弹能够按照给定姿态角度确定的轨迹飞行;最后非线性仿真结果证明该控制律的设计可行。  相似文献   

12.
传统的三通道(俯仰、偏航、滚转)独立小扰动导弹模型不能适应在大攻角与大过载下的控制,于是文中提出基于非线性块对角控制来解决。首先着重分析导弹的垂直转弯飞行方案,鉴于导弹的四层结构并非仿射型,然后对所建立的分层块对角模型进行仿射处理,并采用推力矢量控制方法实现了导弹垂直转弯的块对角控制器设计。最后在模型精准和气动参数摄动下,进行了数字仿真,结果表明系统在完成垂直转弯的同时,还具有很强的鲁棒性。  相似文献   

13.
为解决超声速巡航导弹速度控制系统存在的参数时变、不确定干扰问题,设计了一种反演鲁棒控制律。在巡航导弹的动力学模型中考虑固体冲压发动机的工作特性,分析并建立了超声速巡航导弹速度控制系统数学模型; 采用反演算法推导了虚拟期望推力值,并基于Lyapunov理论设计了具有鲁棒性能的速度控制律。以某超声速巡航导弹为例,设计反演鲁棒控制律,并与传统PID控制进行对比分析,仿真结果表明,速度控制系统能够快速、准确地跟踪速度指令且具有较强的鲁棒性。  相似文献   

14.
王娜  孙瑞胜  杨智刚  傅健 《兵工学报》2018,39(3):494-501
针对低速巡飞器倾斜转弯非线性控制系统存在耦合、不确定项的特点,设计了一种倾斜转弯(BTT)鲁棒反演控制律。将巡飞器的动力学模型写成适用于反演算法的块控模型,假设其由标称模型与不确定项组成,利用微积分学中的Leibniz法则推导不确定项。采用反演算法推导控制律的基本形式,并通过改进的符号函数抵消非匹配不确定项,利用Lyapunov理论重新设计技术补偿匹配不确定项。仿真结果表明,与传统反演法相比,该系统能够快速、准确地跟踪攻角、侧滑角、倾斜角参考指令,具有强鲁棒性。  相似文献   

15.
庞辉  陈嘉楠  梁军  陈英 《兵工学报》2016,37(10):1761-1769
针对车辆悬架系统存在的参数不确定性,提出一种基于模型参考控制的车辆非线性主动悬架反推控制器设计方法。建立悬架系统非线性模型,引入高低通滤波器,根据悬架动行程改变高低通滤波器的通频带宽,设计一种理想的模型参考系统。在此基础上,构造被控悬架系统与模型参考系统之间的车身位移和速度跟踪误差,基于反推控制方法和Lypaunov理论设计了误差跟踪反推控制器。通过仿真实验验证了所提出的误差跟踪反推控制器的有效性和跟踪精度。  相似文献   

16.
反演法控制器,将导弹姿态角作为系统控制对象.控制器根据给定的俯仰角、偏航角和滚动角参考信号得出相应的舵偏输入,使导弹能按给定姿态角确定的轨迹飞行.定点及全空间仿真结果证明,该控制器设计可行.  相似文献   

17.
考虑建模误差的拦截弹制导控制一体化设计   总被引:1,自引:1,他引:0  
宋海涛  张涛  张国良  杨伟锋 《兵工学报》2013,34(9):1167-1172
针对拦截弹末段的制导控制问题,改善已有建模结果,采用智能控制方法设计一体化控制律。考虑近似线性化和忽略耦合因素引起的建模误差,采用模型误差补偿改进拦截弹动力学模型;结合弹目相对运动非线性模型,建立面向拦截弹末段的制导控制一体化(IGC)模型。对此非匹配型非线性系统,利用自适应动态面控制方法进行控制器设计,不仅消除系统非匹配不确定性对系统性能的影响,同时避免了传统反演法的微分膨胀问题,得到控制目标与执行机构指令之间的直接关系。通过与忽略建模误差的IGC 拦截仿真比较,实验结果表明本文IGC 控制效果的优越性。  相似文献   

18.
被动式电液力伺服系统的自适应反步滑模控制   总被引:1,自引:0,他引:1  
针对被动式电液力伺服系统存在固有的多余力矩、控制伺服阀的非线性以及参数时变性问题,提出一种自适应反步滑模控制策略。建立系统的非线性状态空间方程;基于反步控制理论思想,通过3步递推法设计系统的反步控制器;在反步法递推的第3步结合滑模控制方法,选择合适的Lyapunov函数,给出系统不确定参数的自适应律,设计出非线性自适应反步滑模控制器,并利用Lyapunov稳定性定理对所设计的控制器稳定性进行证明。仿真和实验结果表明,该控制器能够有效地抑制多余力矩,并且对参数摄动及外界扰动具有较强的鲁棒性。  相似文献   

19.
针对攻击角度约束和执行机构因物理约束导致控制输入饱和的问题,提出了一种带攻击角度约束和输入饱和的制导控制一体化设计方法。建立了带攻击角度约束的制导控制一体化三通道独立设计模型,采用扩张状态观测器估计和补偿模型误差和通道间的耦合关系。在此基础上,采用终端滑模控制和反演控制,对制导控制系统进行一体化设计,并引入Nussbaum函数和一个辅助系统处理输入饱和问题。通过导弹六自由度仿真验证了所提制导控制一体化算法的有效性,制导精度和角度约束精度比现有制导控制一体化算法更高,且制导控制效果更好。  相似文献   

20.
张民  陈亮  陈欣 《兵工学报》2017,38(1):89-96
针对现有约束粒子群优化(PSO)算法存在的算法复杂、应用范围受限、优化效果不佳等缺陷,提出一种新型约束粒子群算法。该算法采用目标函数替换的方法将约束优化问题转化为非约束优化问题,具有简便易用的优点。通过典型测试函数测试并和其他具有代表性的约束PSO算法进行对比,表明该算法在处理约束优化问题上的优越性。为了验证该算法应用于工程的可行性,以样例导弹纵向模型为对象,针对经典Raytheon控制结构,采用该算法设计了μ-PID控制器。仿真结果表明,样例导弹控制器可以在满足多种时域指标的同时具有良好的鲁棒性能,达到了设计指标要求,验证了所提出算法的有效性。  相似文献   

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