Applied Mechanics and Materials Vols. 347-350

Abstract: For the underwater target detecting task, a binocular vision system specialized to the underwater optical environment is proposed. The hardware platform is comprised of a image acquising unit, a image processing unit and a upper computer. Accordingly, the loaded software system is operated for the camera calibration, image preprocessing, feature point extraction, stereo matching and the three-dimensional restoration. The improved Harris operator is introduced for the three-dimensional reconstruction, considering the high scattering and strong attenuation by the underwater optical environment. The experiment results prove that the improved Harris operator is better adapt to the complex underwater optical environment and the whole system has the ability to obtain the three-dimensional coordinate of the underwater target more efficient and accurate.

Abstract: This paper describes a system for evaluating flight of fixed-wing aircraft. During the flight of an aircraft, flight parameters are obtained and transmitted to the ground station by means of wireless communication. These flight data are received by the ground station and are calculated so as to get the input of flight gear, by internet interfaces flight gear can simulate the real-time state of the aircraft on the ground. The system can be used to evaluate the flight performance of a fixed-wing aircraft.

Abstract: Under the analysis of the current situation and existing problems related to the spare-part distribution management of diesel engine industry, especially the incoordination between service stations and agents, the paper establishes a model featured as the multi-level warehouse, with a view of integrating the information of the whole chain and all levels of diesel engine industry from global warehouse, marketing and basic data, and effectively solving the problems regarding the distribution management of diesel engine industry. In the end of the paper, the implementation of the model in a case company is specified.

Abstract: This paper studies the improvement of the handling performance of 4WD EV driven by in-wheel motors under regular driving conditions. Fundamentally the structure of torque vectoring control (TVC) system for handling control consists of two control layers. The upper layer is a model following controller which makes the vehicle follow the desired yaw rate limited by the side slip angle and lateral acceleration. The torque distribution constitutes the lower layer. Several simulations based on veDYNA/Simulink are conducted to verify the effectiveness of the control system. It is clarified that the control system exhibits satisfactory performance in both open and closed loop maneuvers and the agility of the electric vehicle is improved.

Abstract: We have designed the control system for ink keys of press based on DSP controller TMS320F2812. The operator can remotely control the position of any ink key of ink fountains with a high precision. The upper computer can communicate with any DSP through SCI to transmit the control instructions.

Abstract: A robust flight control method based on the particle swarm optimization (PSO) algorithm is approved in this paper. Because of non-modeling dynamic character and parameter uncertainty are taken into consideration during the controller design process, the flight controller has strong robustness, excellent control performance and one robust controller could realize the large envelope flight control. In order to design the robust flight controller automatically and rapidly, the particle swarm optimization algorithm is used to select the weighting function. The simulation result shows that the weighting function could be designed automatically and rapidly, the flight controller has good performance and robustness.

Abstract: As Internet communications and applications become more and more complex, accurately describing network traffic information and rapidly monitoring network traffic anomalies have become increasingly challenging tasks. In this paper, we present a framework and method for monitoring network traffic through measuring the dynamic changes of host communities. An unweighted and undirected host interaction network (HIN) is established through extracting the social-behavioral characteristics of network traffic. Based on social-behavior similarity in HIN, host community is defined, and then five features are proposed to capture host community changes. Finally, this method is evaluated through two real-world network traffic, and the experimental results show that the method presented in this paper can effectively capture the dynamic changes of host communities to monitor network traffic.

Abstract: Pressure meter is an important testing and storage investment during oilfield hydraulic fracturing. The pressure meter electronic system mainly composed by the microcontroller module, battery module, temperature signal acquisition and processing module, the pressure signal acquisition and processing module and memory module. This paper briefly introduced the principle of pressure meter, and established fault tree based on schematic diagram of pressure meter electronic system and specific cause of failure; Aiming at solving traditional reliability analysis the limitation of long cycle and poor economy, the paper adopt reliability simulation by using MATLAB and combined with the theory of Monte Carlo. Ultimately,getting the reliability curve and life of pressure meter electronic system. The reliability of electronic systems gradually decreases with increasing time and obeyed exponentially distributed law; Electronic system simulation life of 2877.7 hours. In other words, the electronic system can work 2877.7 hours since down to underground of oil well. It has some guidance for engineering practice, as well as provides a measure of reliability analysis for pressure meter electronic system.

Abstract: Acoustic source orientation is an important feature in robot audition. This paper applied a spatial cone six-element (SCSE) microphone array and combined with the time difference of arrival (TDOA) between pairs of spatial separated microphones to estimate acoustic source orientation. Simulate three stages of the acoustic orientation process in a real indoor environment, and results show that the algorithm is simple and effective, reducing the amount of calculation, having anti-noise and reverberation ability to meet the requirements of orientation accuracy.

Abstract: Nowadays liquor blending control systems rely on manual operation mainly, which cannot meet requirements of modern production. An approximate model of the system was established after analyzing its important characteristics. The system is nonlinear and has time-lag, it is difficult to control. So Fuzzy-PID-Smith control was used in the controller design for the nonlinear, time-lag system to meet accuracy and no-overshoot requirements. Simulations show this method has good static and dynamic performances and can meet the requirement of no overshoot.