Applied Mechanics and Materials Vols. 135-136

Abstract: At present, the energy crisis is increasingly serious. Energy-saving becomes a practical issues faced by all fields in the life. Considering this, the paper presents a new vehicle consumption measuring system based on intelligent handling and humane design under the promise of accurate measurement as well as low cost. In addition, the use of radio frequency communication technology makes precise measurement of instant and accumulative fuel consumption come true in any working hours. Field experiment results show that the vehicle fuel consumption measuring system has character of facilitate operation, low cost, advanced and reliable measurement method and high accuracy (within 1.5%). It can improve greatly the production efficiency of the internal combustion machine and avoid effectively the waste phenomenon, and be prone to make further application widely.

Abstract: The necessity of constructing a virtual assembly platform for vehicle transmission is discussed in this paper. Based on function requirement analysis of virtual assembly system for vehicle transmission, the architecture of virtual assembly platform is established. Detailed functions of platform are given. Virtual reality system and structure of software and hardware system for the virtual assembly platform are introduced in detail. The key technologies of virtual assembly platform have been expounded. Some practical instances are realized for verifying relevant functions of the virtual assembly platform of vehicle transmission system.

Abstract: Personalized content management system (PCMS) is an information management and sharing platforms, which is personalized, stable, efficient and extensible. Often any people need to search for suitable bits of information by sifting through many documents which can be very tiring and time-consuming. PCMS is the system that may answer this need. In this paper, the architecture, features of PCMS and key technologies in the field of PCMS research are analyzed. After concluding the popular spots and current status, the future development trends of PCMS are indicated..

Abstract: A risk index system influencing network reliability is built up, based on the overall analysis on the reliability risk factors of communication network. In order to provide theoretical and data foundations for the planning and business management of the whole network, DEMATEL method is applied to obtain main factors influencing network reliability, and then the network reliability risk is quantified by using fuzzy comprehensive evaluation algorithm.

Abstract: In this paper, a new materials image retrieval methodology based on dynamic Bayesian network (DBN) is proposed to overcome certain drawbacks inherited in previously proposed CBIR methods. Firstly, the DBN structure and initial parameters is constructed according to the prior knowledge. Secondly, a training phase is conducted for updating DBN parameters through using the feedback information. The training cycles can be stopped until the retrieval accuracy is adequately high. Experimental results on 10,000 images demonstrate the effectiveness of the proposed methodology.

Abstract: Harmonic minimization in PWM inverters is a complex optimization problem which involves non-linear transcendental equations having multiple local minima. In this paper, a solution to the harmonic minimization problem using the particle swarm optimization (PSO) has been proposed to solve the SHE problem. It overcomes the complicated computations associated with conventional iterative techniques. As an example, in this paper a bipolar PWM inverter with seven switching angles per quarter cycle with varying modulation index is considered, and the optimum switching angles are calculated offline to eliminate the 5th,7th, 11th,13th,17th and 19th harmonics. The simulated results are also validated by experiment.

Abstract: In order to process and analyze the signal of frequency modulated continuous wave (FMCW) radar, a radar semi-physical simulation(RSPS) system based on STM32F103VE6 chip is designed in this paper. By designing the hardware and software of system, the RSPS system can process the radar signal, detect the target, verify the data process algorithm and display the result on TFT-LCD screen. In addition, the collected data can be uploaded to PC by RS-232 interfaces which improves the reliability, stability and practicability of system. The waveform and spectrum maps are utilized to show the feasibility of RSPS system in analysing FMCW radar signal. Experimental results show that this system has many advantages, such as multifunction, low power consumption and low cost.

Abstract: Service has emerged as the major element of the modern world’s economies, especially in the ICT industry. But the theory of service science is far behind the reality. Service science should provide theoretical basis and analysis framework for the service development. Through analyzing service science theory and current literatures, combining ICT companies’ real situation and development challenge, this paper offers several suggestions for service development, and builds the general service portfolio for ICT companies. On the other hand, this application in ICT companies will facilitate service science innovation, education, research application and development.

Abstract: In order to research the crosstalk of multiconductor cable’s different core lines, based on finite-difference time-domain (FDTD) method, the Crosstalk of the four core lines cable without metal shield layer is researched by simulation. Results show that because of the cable’s distributed parameters, the far end voltage of disturbing core line is smaller than near end voltage, the voltage of disturbed core lines is smaller than that of disturbing core line evidently. But when cable is working in thunder and rain, the grounding line of the cable may induce very high voltage, and the high voltage may disturb the core lines of cable that used to transfer useful signals, so the crosstalk can’t be neglected. Experiment is done with four core lines cable without metal shield layer that lay on the earth. Experimental and simulation results are nearly same, which are compared. Because of the influence of experimental loss waste, wire connection and so on, voltage got by experiment is smaller than that got by simulation. Results show that FDTD method is effective in analyzing the influence of the lightning voltage signal.

Abstract: In recent years, single-carrier system has again become an interesting and complementary alternative to multi-carrier system such as orthogonal frequency division multiplexing (OFDM). This has been largely due to the use of frequency domain equalizer implemented by means of fast Fourier transforms (FFT), bringing the complexity close to that of OFDM. This paper aims at providing an overview of single-carrier frequency domain equalization (SC-FDE) and its Wireless applications. We review the brief history and system model of SC-FDE, and the integration of SC-FDE and other wireless transmission techniques. We also present several possible future research topics about SC-FDE.