Applied Mechanics and Materials Vols. 29-32

Abstract: Remote sensing techniques play increasingly important role over recent decades in both problems of global climate change and frequent deterioration of the status of aquatic ecology. In this paper, Landsat ETM+ imagery was used to monitors water quality in Kunming city, southwest China. Five over 30 square kilometers lakes which are Dianchi, Fuxian, Yangzong, Qilu and Xingyun Lake were extracted and investigated. Comparing spectra of different water quality, it can be conclude the reflectance of band 2 and band 3 change dramaticlly corresponding to different water quality, which are relate to the water pollutant. Therefore, the sum of band 2 and band 3 reflectance used as a water quality index was selected to detect water quality. Firstly, the remote sensing data was atmospheric corrected and the reflectance of band 2 and band 3 was added using band math. Secondly, density slice was applied to the processed sum image using suitable data ranges and colors, and six water quality level was outputed. Finally, the result image was projected and outputed. As shown from result, the water quality of Fuxian and Yangzong lake were the best, and Dianchi and Xingyun lake were the worst, Qilu lake was in the middle. Suitable water pollution controls and provention for Kunming lakes would be needed.

Abstract: Atmospheric correction is one of the most important pre-processing steps in quantitative remote sensing. To extract quantitative information from the Enhanced Thematic Mapper-Plus (ETM+) imagery accurately, atmospheric correction is a necessary step. Furthermore, multi-temporal images after atmospheric correction can be compared to each other quantitatively. The Second simulation of satellite signal in the solar spectrum (6S) radiative code can process many types of satellite data and provide several standard atmosphere and aerosol models for atmospheric correction. This paper demonstrates atmospheric correction of Landsat ETM+ data using 6S code. Comparing images before and after atmospheric correction, the different of image before and after correction was not obvious using visual interpretation. Therefore, different ground object spectral curves after atmospheric correction are illustrated. They were similar with the standard ground object spectra. The correlation coefficient of ETM+ band 1 to band 4 and NDVI (Normalized Difference Vegetation Index) after atmospheric correction increases. The atmospheric correction removed the atmosphere effect, so the inherent relevant increased. 6S code was an effective tool for atmospheric correction of remote senisng data.

Abstract: This article presents a remote image monitoring System based on TD_SCDMA technology. This system takes Samsung’s S3C2440 as the processor and the LCD touch screen as the interface. It runs the Linux operating system and captures image information through the front camera. After dealing with image compression by the video capture and compression card, the SIM4100 module carries on the real-time transmission via 3G network, so as to achieve the purpose of remote image monitoring.

Abstract: Aim to conquer the low efficiency of the current auto-CVT actuated by hydraulic system, a new design was proposed based on the analysis of the energy loss, which used compounded disc spring clamp set and motorized actuation system. Through the special design of the compounded disc spring and the balance spring, the axial thrust was well counterpoised, thus it achieved the result that the actuation system could be droved by low power motor. The test results show that the CVT developed according to the new design can reduce the power consumption obviously and improve the power performance.

Abstract: Aiming at the fact that the current method of designing elastic coupling in swashplate engine is deficient, and the vibration damping effect is inadequate, a new method for optimization design of coupling is put forward based on back propagation artificial neural network and genetic algorithm(BP-GA). Firstly the dynamics model of swashplate engine shafting is set up, and the samples are gained by numerical simulation, then the non-linear mapping relationship of elastic coupling designed parameters of the objective function is established with BP neural network, finally the trained network is called back by GA to make global optimization. The optimization results show that the global optimal resolution can be searched rapidly and correctly with the method, besides, the method is precise, convenient and applicable.

Abstract: To cope with the challenges of product quality design system applied in new product development (NPD), a new method of quality control for NPD-collaborative quality design mode, which integrates voice of customer, quality function deployment (QFD) and failure modes and effect analysis (FMEA) , and corresponding functional modules and framework were all put forward. This mode dealt mainly with constructing and running collaborative quality design system, integrated several enabling technologies such as the integration of QFD and FMEA, task distribution of quality design, integrated technology of computer-supported-collaborative work (CSCW). On the basis of these, applying Java, JSP and JavaServlet to the system, improve working efficiency and shorten the development cycle so as to respond to the fluctuation of market demands as quick as possible. The quality design of some automobile was introduced as an example to verify that the system developed would efficiently meet the requirements of NPD.

Abstract: Battery Management System (BMS) mainly focused on the estimation of State-of-Charge (SOC) previously. However, the single SOC could not reflect the true state of battery. Life prediction and performance state estimation becomes an increasingly important issue in each battery life stage. A practical and accurate battery life model is their basis. Much research work has been done in recent years to improve the accuracy and application range of battery life model. This paper introduces commonly used battery life modeling methods and summarized the characteristics of each model and their common applications, and the emphasis for future study is proposed as well.

Abstract: This article introduces a Hardware-In-Loop test platform for electric vehicle Cell Battery Management System (BMS). At first, system structure of test method is projected to make requests for a battery emulator which is the main work of test platform. Then hardware is designed to simulate the input and output signals of BMS. The model for Lithium-ion battery, hardware driver and relative algorithm are built in Matlab/Simulink. After the model is validated, automatic code generation is performed. The code is downloaded to hardware platform. This platform enables validation of BMS instead of using real batteries.

Abstract: Actuator is a kind of rotary mechanism whose power source is the hydraulic pressure oil, which demands that the ratio of torque to deadweight is big ,and efficiency is high ,and reliability is great. On the base of ball helical transmission, this paper puts forward a new type of actuator ,the advanced actuator, which possesses several advantages, such as the ratio of torque to deadweight is big , transmission efficiency is high , impact is minuteness, life span is long, reliability is great, satisfying the demands of an advanced aircraft. This paper mainly introduces the working principle of the new type of actuator, 3D parametric modeling technologies of key parts.

Abstract: The advanced actuator is a kind of swaying mechanism specially developed for certain aircraft, having low rotational speed and great torque. Utilizing criterions of mass equivalent and bending stiffness equivalent, this paper firstly applies simplification to the actuator, getting a piece of continuous beam with varying circular sections. According to the mounting condition of actuator, then establishes the finite element dynamic analyzing model, using I-DEAS software, selecting method of synchronous vector iteration, finishes normal modal analyzing. Next, carries Hertzian contact resonance analyses to ball straight-rotary pair, ball spline pair and ball unload pair, calculates contact resonance frequencies. Considering the resistance torque being moving still concludes formulae of quantity of contact resonance frequencies. Lastly, based on load spectra, makes a conclusion that antiresonance behavior of the actuator is well, showing that the design plan is feasible. Experimentation of prototype indicates that the above theoretical analyses are correct.