Applied Mechanics and Materials Vols. 130-134

Abstract: In this paper, the random vibration theory is employed to research on the dynamic performance of suspension system of new energy vehicle. Based an efficient sensitivity analysis method, vehicle ride comfort and maneuverability have been investigated by suspension parameters optimization. The pseudo-excitation method has been used to analysis the dynamic responses and sensitivity, the computation performance and adaptability have been investigated by using numerical examples. Hence a convenient and accurate computation method for new energy vehicle optimization design is demonstrated and some useful conclusions are drawn.

Abstract: Realtime on-road vehicle detection is a key technology in many transportation applications, such as driver assistance, autonomous driving and active safety. A vehicle detection algorithm based on cascaded structure is introduced. Haar-like features are used to built model in this application, and GAB algorithm is chosen to train the strong classifiers. Then, the real-time on-road vehicle classifier based on cascaded structure is constructed by combining the strong classifiers. Experimental results show that the cascaded classifier is excellent in both detection accuracy and computational efficiency, which ensures its application to collision warning system.

Abstract: In this study, an adaptive servo controller based on LQR is designed for flexible master-slave system (FMSS). A dynamics model, observer and servo controller based on LQR is built respectively. According to the parameter sensitive experiments, adaptive servo controller based on LQR is designed. This research focuses on the performance of rapid response and vibration suppression. Experimental results indicate that adaptive servo controller, which suppresses the saturation of the input torque to ensure the stability, has achieved short time delay and adequate vibration suppression.

Abstract: The mathematical model of electric control air suspension system was built and the intelligent control strategy was put forward in this paper. Then the related simulation and the bench test of 1/4 model of electric control air suspension system were carried out, by which the influence of electric air suspension and its control system to the vehicle dynamic performance was analyzed. The test results were identical with the simulation, which demonstrated that the electric control air suspension system could improve the automobile riding comfort performance. And the research contents had laid the foundation for the future research of electric control air suspension.

Abstract: The basic principle of liquid level measurement with capacitive sensor is described. According to differences in dielectric constant between oil and water, a liquid level detection system for oil tank is designed. The system includes capacitive sensor, signal processing circuit, FPGA logic circuit and the software of computer. Results show that the system has characteristics of easy operation, high precision. It can detect the change of liquid level accurately and effectively.

Abstract: During the practical researches and applications based on passive visual servo, weld torch was often moved to the weld seam initial position manually by human or by the means of accurate mounting devices, which will often cause low efficiency, as well as a increase in manufacturing cost. To solve this problem an algorithm was presented in this paper to identify the initial position of the Aluminum plate weld seam. It’s totally based on passive visual servo system without utilizing any auxiliary optical equipment. This algorithm combined a variety of DIP techniques and approaches, accurate initial position could be extracted successfully. More images were processed by this method to confirm the validity. With the realization of auto-identification precision of the weld jig can be reduced dramatically and the degree of the automation and flexibility can be improved greatly.

Abstract: This article introduces the Android Operating System based electric-device monitoring system, which includes a combination of device faults collection and real-time data uploading functions. Our new system comes equipped with an application for sending faulting pictures, GPS information, and short descriptions to a service center immediately via Gmail. In order to provide a user-friendly interface and guarantee the accuracy of data, the same-time reporting efficiency has been greatly improved. This article describes the process of how to complete the terminal design by using JAVA eclipse+XML. Flow charts of the program terminal and designs of primary modules are also provided.

Abstract: It is critical to understand the workload characteristics and resource usage patterns of available applications to guide the design and development of architecture of the future large scale servers. In this paper, we analyze the workload performance characteristics of the actual Bank Intermediary Business (BIB) characteristics with BIBmodel and BIBbench design work, and propose BIB performance workload and use case definitions. The analysis and comparisons of workload and use case illustrate that the workload performance characteristics of BIB is totally different with TPC benchmarks. With the development of economy and technology, the requirements for BIB servers are important in modeling, benchmarks developing and workload performance characteristics studying are increased nowadays.

Abstract: This paper presents outdoor fully autonomous control for a Quad-Rotor MAV (Micro Air Vehicle). In case of natural disaster like earthquake, a MAV will be very effective for surveying the site and environment in dangerous area or narrow space, where human cannot access safely. In addition, it will be helpful to prevent secondary disaster. Our Autonomous Rotary-wing MAV is a quad-rotor type MAV which total mass is 660g and is capable of 10 minute outdoor flights. In order to measure the relative position of the MAV, we have installed a sensor-board which includes GPS, gyro, and acceleration sensors on our MAV. So it can achieve fully autonomous flight control with the complete embedded system. We also have installed a wireless camera to our MAV so it can transmit image data to the ground station. This paper describes model based autonomous hovering control, guidance control performance of our quad-rotor MAV.

Abstract: The subject of this paper is the local minima problem (LMP) inherent in potential field methods (PFMs). Firstly, the underlying theoretical basis of LMP is formulated and its theoretical difficulty of control design is analyzed. It is shown that there does not exist a static state feedback control to solve LMP. Then a time-varying continuous control law is proposed to tackle this problem. In particular, challenges of finding continuous control solutions of LMP are discussed and explicit design strategies are then proposed. Moreover, systematic rigorous Lyapunov proof is given to show both global goal convergence provided that the goal is globally reachable and obstacle avoidance of the proposed controls. Simulation results are provided to illustrate the validity and effectiveness.