The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In the traditional terminal guidance, the state estimator and guidance law are design independently by assuming the validity of the separation principle and the certainty equivalence principle, which are only valid for linear systems with Gaussian noise. This paper considers the nonlinear terminal guidance system for a target interception problem by multiple vehicles. Firstly, the probability density...
For the missile-target relative motion equations in the two-dimensional plane, a sliding mode guidance law design problem with terminal line-of-sight angle constraints in maneuvering target intercept is investigated in this paper. The attack angle constraints are transformed into line-of-sight angle constraints. A finite-time convergent linear sliding mode surface including the desired line-of-sight...
In this paper, the nonlinear H∞ guidance law design is proposed for the near space interceptor (NSI) based on Galerkin simultaneous policy update algorithm (GSPUA). Initially, the nonlinear H∞ guidance law design problem for the NSI is converted to solve the Hamilton-Jacobi-Isaacs (HJI) equation, which is notoriously difficult to solve both numerically and analytically. In the two-player zero-sum...
By the virtual modeling technique of Pro/E, the 3D solid modeling was made for the key parts of the no-tillage planter, and virtual machine was assembled. The virtual machine was connected with the tractor model, and the direct of the rectilinear motion was set, then simulation motion of the no-tillage planter had been carried out. The curve was obtained about the displacement, velocity and acceleration...
Recently we showed that an expressive class of mathematical equations can be automatically translated into simulation codes. By focusing on the expressivity of equations formed from continuous functions, this work did not accommodate a wide range of discrete behaviors or a dynamic collection of components. However, the interaction between continuous and hybrid components in many cyber-physical domains...
The time that micro mouse escape from the maze does not only depend on the length of its chosen path, but also on its acceleration or deceleration or turning characteristics. The Simply planning algorithm performance cannot accurately reflect the time performance that the micro mouse spend in escaping from the maze. By simulating the maze and micro mouse and modeling its moving features, this thesis...
Based on the concept of nominal effort miss (NEM), a guidance law for boost phase is proposed to handle the situation when the solid rocket motor in the tactical missile must be used up. On the foundation of zero effort miss (ZEM), NEM is defined and the differences between them are compared. By means of the trajectory prediction and the property of NEM, a calculation approach to NEM is derived. In...
To suppress two-dimensional load sway caused by the horizontal boom motion of a rotary crane, both horizontal and vertical boom motions are generally used. However, it would be more energy efficient and safer if a control scheme were developed that only used horizontal boom motion, eliminating the need for any vertical boom motion. In addition, if we can suppress load sway without the need to measure...
The present wind detection model of weather UAV has limitations. In order to detect the wind speed of multi-flight states, the intelligent wind detection system of weather UAV based on the multi-mode variable structure was proposed in this paper. According to the change of acceleration and angular velocity, three detection equations were established. Based on flight motion states, the intelligent...
We consider the problem of controlling the yaw and lateral dynamics in heavy vehicles, consisting of combinations of a truck and multiple towed units. In such heavy vehicle configurations, undesired yaw rate and lateral acceleration amplifications, causing tail swings and lateral instabilities of the towed units, can be observed at high speed. In this paper, we present a predictive control approach...
A crank slide-way mechanism is a kind of mechanisms between crank slide mechanisms and crank rocker mechanisms, the main difference is that: in the same case of taking uniform speed as input, the output is neither linear displacement nor the arc path, but a specifically curve. So in some cases, A complex output path can be realized when kinematical curves with special shapes have been accepted. The...
To improve performances of chain transmission, a crank slide-way mechanism with path restrictions, which is equivalent to a chain transmission mechanism is introduced. A complex output path can be realized when kinematical curves with special shapes have been accepted. An equivalent analysis method of chain transmission is put forward in the paper. The kinematics and dynamics mathematical models based...
When the motor speed is reduced by using a regenerative brake, the mechanical energy of rotation can be converted to the regenerative electric energy. In order to improve the efficiency of the motor drive systems, optimal regenerative and acceleration torques of the motor should be discussed in order to maximize the regenerative electric energy and to minimize the required energy for acceleration...
In this paper, we will implement three-dimensional pursuit guidance law with feedback linearization control method and study the effects of parameters. We first introduce guidance laws and equations of motion of a missile. Pursuit guidance law is our highlight. We apply feedback linearization control method to obtain the accelerations to implement pursuit guidance law. The solution makes warhead direction...
This paper discusses the development of guidance scheme for multiple missiles co-operation engagement. Firstly, based on the intercept point, the mid-course guidance out of the aerosphere is studied to obtain the shutdown condition. Secondly, using the the linearization of the control model and error feedback loop in the mid-course guidance out of the aerosphere, a new guidance law called ITCG (Impact-Time-Control...
When systemic rotation autocompensation technique is implemented in inertial navigation system (INS), inertial measurement unit (IMU) undergoes intentionally devised mechanical motions. This technique is one of the strategies of improving the system precision performance at the system level. A dual-axis continuous rotation scheme is introduced, and system error equation is derived. The behaviors of...
Set up the mathematical model after the dimension was achieved, and then kinematics simulation analysis could be easily doing by using MATLAB\SIMULINK simulation platform. Parameters could be easily modified and the analytical solution could be got accurately, design time could be saved and the quality of the product could be improved. The results were saved in the workspace of MATLAB software, and...
This paper concerns the problem of swinging up multiple parallel pendulums on a cart by controlling only the energy of pendulums. Although the analysis of the energy control for swinging up single pendulum and two pendulums on the cart has been achieved in existing literature, a few analysis results have been reported for the case of multiple (greater than 2) pendulums. In this paper, we aim to provide...
Hula-hoop is not only one of familiar toys but also interesting system as a nonlinear control system. While humans play hula-hoop, hoop does not slide on the body but rotates around it. Though it is controlled only by the motion of the body, humans can realize enduring rotary motion without dropping hoop. The purpose of this paper is modeling and control of hula-hoop system as a nonlinear control...
Proportional-Integral-Derivative (PID) control is widely used to control mechanical systems. In PID control technique, however, there are limits to the accuracy of the resulting movement because of the influence of gravity, friction, and interaction of joints caused by modeling errors. Digital acceleration control has robustness for the modeling errors. But it requires position, velocity, and acceleration...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.