Key Engineering Materials Vols. 474-476

Abstract: In order to strengthen the administration of the barn, we need to storage environment for scientific and effective monitoring and analysis. This paper firstly filter and merge the temperature and humidity information in the environment by using fuzzy neural network, then regard the temperature and humidity as particles, calculate the fitness of the particles according to corresponding mildew rate and cost, finally the outputs of temperature and humidity curve values are obtained through iterative optimization of local and global extreme by particle swarm algorithm.

Abstract: The paper refers to the mathematical model of gasoline engine, and builds liquid-jet LPG(Liquefied Petroleum Gas) engine model. Based on the model, when the specific of the parameters distribution of operating engine are known, RBF neural network can estimate center value and the number of hidden layers precisely, and control engine A/F in fine range. But the parameter features of operating engine are unknown in advance. The paper provides a improved subtractive clustering - RBF neural Networks algorithm to control A/F of LPG engine. Simulation shows, improved subtractive clustering can precisely determine the number of neuron of RBF neural network hidden layers under unknown operation parameters, and the precision is higher, and self-study and adaptive adjusting is better than before.

Abstract: Environmentally assisted cracking (EAC) or stress corrosion cracking (SCC) of key structural materials in the environments of the light water reactor is one of the main problems for the management of the structural safety and service life of nuclear power plants. To understand the effect of oxide film thickness on SCC growth in structural materials in a high temperature water environment, the stress-strain field at the tip of a SCC in nickel base alloy constituted by base metal and oxide film was analyzed in this paper by finite element method using commercial software. The effects of oxide film thickness on the stress-strain field at the tip of the SCC was obtained, which provides a new insight into the research of the mechanism of SCC growth in structural materials in a high temperature water environment.

Abstract: Given the development of the Web 2.0, blog becomes one of the most popular applications in the Internet. Internet users spend a lot of time to post and read articles, search for other’s opinions and recommendations in the blogs. Why so many users are stuck on the blogs What are the key factors to influence user’s blog continuance This study uses Post-Acceptance Model of IS Continuance as basic model, and combines with information quality and service quality to explore what factors affect internet user’s continuance of recommendation blog. The study adopts cates recommendation blogs as experiment platform, and collects 212 Taiwanese samples from internet. After the analysis of structural equation model, main results are the followings: (1) Users’ perceived usefulness and satisfaction will affect their continuance of recommendation blog; (2) Users’ perceived usefulness, ease of use, confirmation, and blog’s information quality, service quality will affect users’ satisfaction; (3) Blog’s information quality and service quality will affect users’ confirmation.

Abstract: The residual stress and the effect of microstructure parameters on failure performance of Ti/TiAl micro-laminated sheet were studied by Correlative theory and FE method. The results showed that the fracture work increases gradually with the increasing of layer number or thickness ratio. However, the rising extent reduced gradually and when the two parameters exceeded a certain value, the fracture work would not be changed. The value of residual stress reached its maximum at the centre and reached its minimum at the edge of micro-laminated sheet. Residual stress in Ti layers and Ti-Al layers was compressive stress and tension stress respectively. With increasing of layer number or thickness ratio, compressive stress would rise gradually and compressive stress would reduce gradually.

Abstract: This paper describes a temperature detection design of the bearing of mineral processing equipment based on Infrared and wireless technology. The temperature of bearing is detected, and sent to the receiving terminal by Wireless bearers; the terminal can display the processes and operates it. The receiving terminal can provide standard industrial signal output, the signal can be sent to the control system of PLC, so the equipment state can be remotely monitored.

Abstract: A standing wave-tube system for acoustical property measurement of vehicle-used sound absorption materials is developed in this paper. Theoretically, the standing wave ratio method and the two-cavity method with two-microphone configurations are combined and applied for calculating some acoustical parameters, such as sound absorption ratio, reflection coefficient, characteristic impedance, propagation constant, of a sample material. Based on the combined method, the standing wave-tube system including two microphones, an A/D board, a signal amplifier, a DSP computer and a set of software is carefully designed and performed. The verification results suggest that the newly designed system is accurate for acoustical property measurement of the materials used on vehicles. It can be directly used for selecting noise-control materials in vehicle acoustical designs.

Abstract: The sidewall curl caused by springback widely exists in the U-shape part especially to the advanced high-strength steel. Based on the mechanism of springback and the curl, this paper proposes that the reinforcement is useful to control the U-shaped part’s sidewall curl. The influence law of section parameters such as width, height etc on springback are analyzed. Then a sensitivity analysis was conducted and the prior order of sensitivity factors is given. The result indicates adding the geometric features of reinforcement to part is effective to control the springback and also provides the advice for the springback engineering control in the beginning of part design.

Abstract: This paper describes the use of FPGA realization of communication stations, then road transport service data method, if duty rate 32Kb/S, usually on duty voice quality ask for much, as long as can understand. Therefore, if duty rates can be lowered into the appropriate data transmission rate by reducing some of the data, the formation of voice, data combined for the road transport, the rate of post-combiner 32Kb / S, telephone channels in the transmission of duty .this paper designed a total of 5 programs, if the rate of the service16Kb/S, the data rate of 9.6Kb/S, 4.8Kb/S program, done simulation, meet design requirements.

Abstract: Non-Gaussian probability distribution radar clutter not only is temporal correlated between different pulses, but also is spatial correlated between different range bins. In this paper, the method of simulation and validation of radar clutter is proposed using spherically invariant random processes (SIRP). The amplitude probability function and temporal correlation function of radar clutter can be controlled respectively, and the spatial correlation function can be also specified. The computer simulation of K-distribution and CHI-distribution radar clutter is used to validate the method, and is to validate the amplitude probability function, temporal-spatial 2D correlation function.