Applied Mechanics and Materials Vols. 121-126

Abstract: The performance management of e-government is crucial for e-government construction which can realize the orientation function to directly influence the e-government constructing level. This paper attempts to build e-government performance management system in view of service-oriented government from micro and macro perspective, to enhance its service quality and public satisfaction. This paper defines performance management and e-government performance management system in view of service government, in this basis, build e-government performance management system in view of service government from the perspective of the macro and micro system, meanwhile in order to establish e-government performance management system comprehensively, the article finally stated the problems we should pay attention to when building performance management system. The article builds the macro model of e-government performance management system, and also built the static of five system and dynamic system of PDCA cycle system in micro-system.

Abstract: Integer bugs are considered to be the rising threat to mission-critical software. For the oracle problem, testers always ignore integer bugs unless program throws an exception obviously. In this paper, we propose a general procedure based on metamorphic testing to detect integer bugs without oracle and a strategy of the metamorphic relation selection as the complement to T.Y.Chen’ one. The experiment result shows that our approach can detect some invisible mission-critical software failures caused by integer bugs, which are difficult to be found in conventional formal method.

Abstract: The manufacturing tolerances of a hydrodynamic journal bearing system are inevitable in manufacturing process. To examine and understand the effect of manufacturing tolerances on the system stability can help engineers to confidently choose reasonable tolerances at design stage. This study presented a theoretical analysis method to determine and compare the effects of dimensional manufacturing tolerances and journal out-of-roundness on system stability by Taguchi method. The results show that the journal out-of-roundness has the most significant effect on the system stability and the journal out-of-roundness appears to stabilize the system. The authors suggest that both dimensional manufacturing tolerances and journal roundness should be taken into account in the design of cylindrical journal bearings.

Abstract: According to the current status of Chinese undergraduate education development and practical innovative talent training, the advantages and disadvantages of undergraduate Innovative talents training modes and exam-oriented education system in China’s colleges are analyzed and represented. And then, the problems faced and solved in the practical innovative talents training process are also discussed. Finally, the paper proposes some solving approaches and development strategies for training and improving Chinese undergraduate practical innovative abilities. These approaches and strategies are extracted from practical teaching experience and have important reference role for the undergraduate education.

Abstract: According to one system circuit board testing needs，one general circuit board detection system based on USB is designed，which achieve interactive testing on system multiple electronic subassembly and automatic testing on circuit board.The system hardware platform and software architecture and key technology is given in this paper.

Abstract: The paper proposes the design method of output filter and repetitive controller of inverter in stand-alone PV system. The design of filter considers the impact of filter on the inverter main circuit in order to increase the stability of the inverter. For the serious waveform distortion when the inverter runs independently with non-liner load, the circuit introduces repetitive control and presents a new parameter design method of repetitive controller. The simulation results prove that the design method is correct and feasible.

Abstract: By the analysis of the development tendency and test standards requirements of high-level hydraulic support, this paper primarily determines the chief technical parameters and overall structure of the test rig for whole hydraulic support, and its 3-D model is built and assembly check is conducted by using SolidWorks. Then, the hydraulic control system and data acquisition system of the test rig are designed. In the end, the 3-D model of the test rig is imported into COSMOSWorks to accomplish the finite element analysis. According to analysis result, the strength of the test rig can meet the requirements, which ensures the design quality of the test rig for whole hydraulic support.

Abstract: The singularity-free workspace of parallel mechanisms is important in the trajectory planning and the kinematic design of the mechanisms. The planar parallel mechanism with revolute actuators, which the expression for the singularity locus and the algorithms for determining the singularity-free zones involve both the Cartesian and the joint variables, has been studied in the paper. Algorithms are proposed here to simplify the determination of the singularity-free zones in Cartesian space. The methodology and procedures for determining the singularity-free zones of planar parallel mechanisms with revolute actuators are introduced. The numerical results show that the simplified algorithms and the techniques are correct and efficient in determining singularity-free zones in the workspace of planar parallel mechanisms.

Abstract: Consumption demand has transferred from quantitative consumption to "perceptual consumption" at nowadays through qualitative consumption changes along with arriving of information age. Development direction for guiding thoughts of designing creation shall be pursuing of more harmonious and closer perceptual relations between user and commercial goods in the future. Product designing shall not only focus on integration of visual elements but shall also pay more attention to perceptual part produced by overall sense organ in product using process. This essay discusses on how to implement product perceptual design by carrying out visual, touching, hearing, smelling and other organ element analysis.

Abstract: Following the test work is difficult and complex in the modern radar maintenance support, the automatic testing of radar board is necessary for the radar maintenance man. A automatic test system of radar board based on virtual instrument technology is discussed. The system used PXI bus technology and Labview program language. The design of automatic testing system is given, its hardware solution and software solution is designed. And finally the reliability and expansibility of system design is discussed at last.