Applied Mechanics and Materials Vol. 392

Abstract: Contemporary importance of the unmanned aerial vehicle (UAV) both for military and civilian applications has prompted vigorous research related with guidance, navigation and control of these vehicles. The potential civilian uses for small low-cost UAVs are various like reconnaissance, surveillance, rescue and search, remote sensing, traffic monitoring, destruction appraisal of natural disasters, etc. One of the most crucial parts of UAVs missions is accurate navigation of the vehicle, i.e. the real time determination of its position, velocity and attitude. Generally highly accurate Strap down Inertial Navigation Systems (SINS) are too heavy to be flown on UAVs. Moreover highly accurate SINS are also highly expensive. Therefore the low-cost and low weight MEMS based SINS with a compromised precision are the viable option for navigation of UAVs. The errors in position, velocity, and attitude solutions provided by the MEMS based SINS grow unboundedly with the passage of time. To contain these growing errors, integrated navigation is the resolution. Complementary characteristics SINS and external non-inertial navigation aids like Global Positioning System (GPS), Celestial Navigation System (CNS) and Doppler radar make the integrated navigation system an appealing and cost effective solution. The non-inertial sensors providing navigation fixes must have low weight and volume to be suitable for UAV application. In this research work GPS, CNS and Doppler radar are used as external navigation aids for SINS. The navigation solutions of all contributing systems are fused using Federated Kalman Filter (FKF). Three local filters are employed for SINS/GPS, SINS/CNS and SINS/Doppler integration and subsequently information from all three local filters is fused to acquire a global solution. Moreover adaptive and fault tolerant filtering scheme has also been implemented in each local filter to isolate or accommodate any undesirable error or noise. Simulation for the presented architecture has validated the effectiveness of the scheme, by showing a substantial precision improvement in the solutions of position, velocity and attitude.

Abstract: THS II^[1-3] is one of the most popular HEV configurations which has three power sources: an engine, an electric motor and a generator. When the engine is started, the dynamic response of engine will cause the vehicle to be power failure or great fluctuation. Therefore, in order to ensure good effect of vehicle dynamic coordination, it is necessary to use the electric motor's torque compensation principle to achieve dynamic coordination control of power sources, during the period of mode switch.

Abstract: Giant magnetostrictive actuator (GMA) has been used in precise position, active vibration control etc. for its merits of large output force and displacement. At low drive level, GMA presents linear relation between displacement and input current, while nonlinear appears when applied moderate or high drive level. This paper addresses the development of model-based adaptive sliding mode control designs for GMA operating in nonlinear and hysteretic regimes. Homogenized energy model in combination with a quadratic moment rotation model for magnetostriction is adopted in this paper to describe hysteresis of GMA, and its inverse model is employed as a inverse filter before GMA system to compensate the hysteresis and nonlinear. The proposed control law guaranteed global stability of the control system with certain accuracy in tracking desired trajectories. Simulation result verified the correctness and effectiveness of the extracted control method.

Abstract: The driving stability and comfort-ability are directly influenced by steering system, and it is a critical component in an automobile. Torsion bar torque sensor signal and the vehicle speed signal are used to calculate the assisting torque that on the motor shaft. The rules about how to calculate desired torque signal is very important for driving portability and stability. Influence of motor control strategy on assisting response characteristic. In this paper adaptive fuzzy control rules is proposed for the assisting characteristic and power motor. Base on assistance characteristic and assistance motor fuzzy control is designed. Fuzzy information processing torque signal, vehicle speed signal, with MATLAB simulation contrast experiment, and the result validation the fuzzy controller.

Abstract: In this paper, a kind of pressure-flow compound fault-tolerant control module based on Knowledge Modules of Hydraulic Fault (KMHF) is designed rationally. The simulation analysis of the pressure-flow perceptible control module based on KMHF has been made and the fault-tolerant properties of the pressure-flow perceptible control module have been studied. By analyzing the simulation results, it turns out that the pressure-flow compound control module based on KMHF as a new hydraulic fault-tolerant technology present in this paper can improve the reliability and safety of practical hydraulic system and has important application value.

Abstract: The error of gain of servo control system transfer function is larger by the method of frequency measurement, In this paper, By appying voltage on the both ends of the motor, measure DC response of system to tmeasure the DC gain of control object.Experimental results show that the gain accuracy by the measurement method increases 2.5 times than the traditional measurement.

Abstract: This design in certain food products factory for intelligent control of wastewater treatment processes, monitoring and management. The system consists of lower and upper computer. The lower-level computer consists of PLC and the intelligent instruments. The intelligent instruments can process control the frequency conversion timing machine, opening valve and so on. The PLC can receive all data from the controlling instruments of the upper-level one. Eventually MCGS configuration software, real-time monitoring of wastewater treatment processes and changes of analog. So as to realize combination of automatic and manual control, field and remote control with the combination of purpose.

Abstract: The smart hotel lighting control system is the essential feature of every hotel in the future. In order to improve the performance of the system and make it easy to unified manage a large number of rooms, a design of smart hotel lighting control system based on ARM is put forward. The system uses STM32F107 which is an ARM chip based on the Cortex-M3 architecture as the main controller. The system can use switchs to control lighting, it also transplants LwIP protocol stack to achieve Ethernet remote management. This paper will make a detailed introduction of the system through both hardware and software aspects.

Abstract: this design uses the industrial PC as upper computer. The bar code positioning system encoder and laser ranging sensors are used to locate the crane 3 d coordinate position. The crane automatic control program is based on VB6.0 .This paper analyzes the problems and solutions encountered in the implementation process, finally achieves the automatic control of the crane.

Abstract: Bilateral teleoperation systems connected to computer networks such as the internet have to deal with varying time delays depending on several factors such as congestion, bandwidth, or distance. Such systems can easily become unstable due to irregular or varying time delays. A passivity concept has been used as the framework to solve the stability problem in bilateral control of teleoperation systems and we demonstrate in this paper how to recover both passivity and tracking performance using a novel control architecture that incorporates time varying gains into the transmission path, feedforward, and feedback position control. Simulation results for a single-degree of freedom master/ slave system are presented which demonstrates the performance of the resulting control architecture.