Transient Performance of Electrical System in a Military Vehicle

Electrical system in a military vehicle is a low voltage (28 V dc) system which is an unsymmetrical and nonlinear system made up of silicon-rectifying generator and a battery in parallel. Studies have been carried out using numerical method to calculate its transient performance. State variable and coordinate transformation have been adopted to express the functional modes and its transfer law of the silicon-rectifying generator; the battery is expressed as a simplified equivalent circuit according to its characteristics during transient process: Consequently, the general mathematical model of electrical system in a military vehicle is presented. Examples of electrical systems in somemilitary vehicles have been taken to carry out the calculation of transient performance and the findings have been compared with the test results of an actual vehicle to show that the numerical method designed works

Method for Improving the Performance of Electric Drive of the Tank Turret

A method for improving the performance of the electric drive of the tank turret device is developed, using an electronic circuit in place of the polarizing relay. This system is designed according to the theory of electronic optimal regulation. Tests proved the improvement to be quite effective. The Volume of the sample product employed in this method is smaller and its price is lower

Alternating Current All-electrical Gun Control System in Tanks

The ac all-electrical gun control system is composed of permanent magnetic synchronous machine-drive control systems and the ball-screw by replacing the complicated electrohydraulic systems. At the same time, the variable-structure system with sliding modes makes the gun control systems to have higher performances using the only rate flexure gyroscope. Thereby, vehicle hull gyroscope and angular gyroscope are left out.The new ac all-electrical gun control systems developed are reduced by 40 per cent in weight, decreased by 30 per cent in volume, increased by 35 per cent in efficiency, and enhanced by three times in service life as compared to the current gun control systems

Analyses of Magnetic Field Induced around a Tank

A tank is taken to have the shape of a hollow spheroid. Equations for calculating the induced field are derived based on a special coordinate system established around the spheroid. A numerical example to illustrate the magnetic field induced around a tank and its analyses are given

A Review of Active Yaw Control System for Vehicle Handling and Stability Enhancement

Yaw stability control systemplays a significant role in vehicle lateral dynamics in order to improve the vehicle handling and stability performances. However, not many researches have been focused on the transient performances improvement of vehicle yaw rate and sideslip tracking control. This paper reviews the vital elements for control system design of an active yaw stability control system; the vehicle dynamic models, control objectives, active chassis control, and control strategies with the focus on identifying suitable criteria for improved transient performances. Each element is discussed and compared in terms of their underlying theory, strengths, weaknesses, and applicability. Based on this, we conclude that the sliding mode control with nonlinear sliding surface based on composite nonlinear feedback is a potential control strategy for improving the transient performances of yaw rate and sideslip tracking control

Modeling, Control, and Optimization in Aeronautical Engineering

The last decade has witnessed the rapid development of aeronautical engineering including all branches of applied sciences and technology dealing with aircraft and their support systems, which brings forward the higher request of safety, efficiency, and environmental protection. Modeling, control, and optimization of aeronautical engineering have played an increasingly important role in meeting aeronautical requirements, and they have drawn widespread attention from communities including control theory, intelligent optimization, system science, real-time distributed computing, electronic information engineering, and aeronautical engineering industry. Driven by such motivations, the main focus of this special issue is on the new theories, new technologies, and their applications in modeling, control, and optimization for aeronautical engineering systems. The special issue is a collection of original research articles, whose authors and editors belong to academic or research institutions of five different countries from Asia, Europe, and Australia. The full papers in this issue can be broadly organized into two main categories: (i) modelling and optimization and (ii) control techniques. Papers in category (i) are mainly concerned with network optimization of air transportation system and terminal-area operation. Recently, people come to realize that the air transportation system can be modeled as complex networks. Along this line, K. Cai et al. in “A Novel Biobjective Risk-Based Model for Stochastic Air Traffic Network Flow Optimization Problem” and X. Guan et al. in “An Airway Network Flow Assignment Approach Based on an Efficient Multiobjective Optimization Framework” modeled the flight operation as network flow optimization problem and proposed novel algorithms, respectively. Terminal-area operation is the bottleneck of the air transportation system. Y. Yang et al. investigated the aircraft intent inference approach and proposed an online trajectory clustering method, which will be meaningful to the efficiency and safety of busy terminal area. Papers in category (ii) are focusing on the topics of rotary-wing aircrafts and robots. The rotary-wing aircraft is one of the popular platforms in the control community such as the helicopter and quadrotor. T. Oktay and F. Sal in “Helicopter Control Energy Reduction Using Moving Horizontal Tail” attempted to improve the flight duration by reducing consumption of the energy. X. Xu et al. in “MRAC Control with Prior Model Knowledge for Asymmetric Damaged Aircraft” intended to explore control of the wing-damaged aircraft, which is one of advanced topics to improve survivability of the fighters. Z. Li and Y. Wang in “Coordinated Control of Slip Ratio for Wheeled Mobile Robots Climbing Loose Sloped Terrain” attempted to explore the control of mobile robots in 3D environments. J. Lopez et al. in “A Robust H∞ Controller for an UAV Flight Control System” implemented and validated a robust H∞ controller for an UAV to track different types of manoeuvres in the presence of noisy environment. It should be mentioned that a special issue simply provides a snapshot of the field taken at a particular point in time. Due to the standard page limitations of a journal volume, it can only include a relatively small number of papers. As a result, its coverage is by no means complete despite our best efforts. Document type: Articl