Applied Mechanics and Materials Vols. 121-126

Abstract: With rapid development of WebGIS technology, the agricultural administration sections can publish and maintain the quality information of cultivated land by WebGIS, it allows users remotely access, query and analyze the information of land quality and soil fertility through the network for farmers to provide decision-making information of farming and fertilizer. Taking Yu county, Henan province, China as an example, this study presents the implementation of WebGIS for the Yu county’s land quality using ArcGIS Server and ASP.net. The system has basic functions of the geographic information system, such as enlargement, reduction, roaming, full display, length and area measurement; the system can also use the advanced functions, such as the advanced SQL query, print the query results according to different scales, etc. The system also provides the relationship with the public map services (Virtual Earth), it make the user find easily the location information of his own spot. This study provides the basic data management platform for agricultural informatization.

Abstract: In order to realize the intelligent machines, the practical model is proposed to predict the in-process surface roughness during the ball-end milling process by utilizing the cutting force ratio. The ratio of cutting force is proposed to be generalized and non-scaled to estimate the surface roughness regardless of the cutting conditions. The proposed in-process surface roughness model is developed based on the experimentally obtained data by employing the exponential function with five factors of the spindle speed, the feed rate, the tool diameter, the depth of cut, and the cutting force ratio. The prediction accuracy and the prediction interval of the in-process surface roughness model at 95% confident level are calculated and proposed to predict the distribution of individually predicted points in which the in-process predicted surface roughness will fall. All those parameters have their own characteristics to the arithmetic surface roughness and the surface roughness. It is proved by the cutting tests that the proposed and developed in-process surface roughness model can be used to predict the in-process surface roughness by utilizing the cutting force ratio with the highly acceptable prediction accuracy.

Abstract: The inventory management problem with uncertain demands is considered in this paper. the possibility theory and credibility theory are employed to solve the problem regarding uncertain demands, and different order strategies and storage strategies according to the different customer’s demand are designed for rational inventory management. Finally, a rule is designed for choosing the storage strategy.

Abstract: This paper carried out a method of transferring PUMA560 models in Pro/E to MATLAB . And then it rebuilds two robots 3D models in MATLAB by using the 3D Visualization in it .In addition , this thesis plans the trails of the two robots coordinated motion which satisfied the need of position and posture of the two robots coordinated work in the situation of non-collision . This paper also provides a secure and convenient method for the development and application of two robots .

Abstract: A three-dimension discrete element model of the shot blasting machine has been established to study the principles of shots flow motion in shot blasting machine. The three-dimension discrete element method (EDEM) was used to analyse the shot-motion process inside the shot blasting machine. The dynamic law of shots motional process inside shot blasting machine was shown through simulation.

Abstract: As the development of industry wireless networks, sensor network, innovative sensors, radio frequency identification (RFID), and micro-electro-mechanical system (MEMS) technologies, the industry sector has made great progress in data acquisition, treatment, transfer and analysis, greatly expanded people’s ability to access information, and to control and use them. This paper developed a wireless data acquisition and storage system of CNC machine tools based on LabVIEW graphical programming language and IEEE 802.11 wireless communication protocol, effectively expanded the ability to access and use the CNC machine status information; solved the problem of data collection caused by the environment complexity of manufacture workshop and the hardness of wiring; eliminated the dead zone of manufacture workshop in the processing of the data acquisition of state information of bottom processing equipment; made the bottom machining unit no longer be the information island for manufacturing enterprises.

Abstract: As energy, resource and environmental issues become more and more serious, sustainable product attracts increasing attention. Products with short lifecycle, such as consumer electronics, gain particular concern. Authors formulate a sustainable product lifecycle evolution method based on Markov decision process. It was validated by an example that the method can select suitable phases at which company should invest money and resources.

Abstract: In order to understand the vibration characteristics of the steering system and provide suggestions for improvement, a model of the steering system was created based on finite element method (FEM). Also, the modal analysis of the steering system was presented, and the first twenty step modes were calculated and analyzed. The steering system was also evaluated from the resonance point of view. The result shows that the frequency of the first step mode is 31.578 Hz which is higher than the exciting frequency of the engine; also, the road roughness excitation frequency has a minor influence on steering wheel vibration.

Abstract: In order to analyze dynamic characteristic accurately during steering, electric power steering system is selected as research object and dynamic equation of steering system is established. Combined with eleven degrees of freedom vehicle model and tire model at combined conditions of longitudinal slip and side slip, the integral-simulation model of electric power steering system is established. The dynamic response of steering system at different steering wheel angle, control methods, front wheel steering angle and braking force is analyzed. The simulation results show that electric power steering system with neural network control has good stability, tracking performance, assist characteristic and anti-interference ability. The established model can reflect the dynamic characteristic correctly and effectively during steering.

Abstract: In this paper, influence mechanism of variously physical factors for milling force in any feed direction is studied during the milling process. Firstly, the effects of spindle eccentricity, cutter deflection and cutter vibration for the instantaneously undeformed cutting thickness are analyzed, and the mathematical expressions of chip thickness is set up. Then,on this basis of cutting force and chip load, the milling force model of ball-end mill with considering integrated physical factors is established though the differential method, and a simulation system for prediction of milling forces during the milling process is developed. This milling force model is verified through simulation and analysis of milling forces.