Applied Mechanics and Materials Vol. 443

Abstract: We designed the binary programmable resistor, using search method found near the nominal resistance value closest to the actual resistance. This method is effective to overcome the contact resistance, temperature drift effects, To achieve a low-cost high-precision.

Abstract: Arch rib construction of Zhenzhu Bridge on the road from Wuchuan to Pengshui in Guizhou uses construction technology of vertical casting in the first place, and then vertical rotation, and the total weight of which is 610t. This paper introduces technical points and process of vertical rotation construction, and has made beneficial exploration and summary of such kind of construction technology.OverviewBridge rotation construction has advantages including saving costs for hoisting and erecting frames, reducing risks of frames losing stability when casting arch rib concrete, convenient, flexible, safe, reliable and good integrated construction operation, structural line type and internal forces are easy to adjust and control, small range requirement of construction site, and low impact on surrounding environment. Bridge rotation construction would have a broad application prospect in the practice of bridge construction, especially in Chinas southwest area with wide distribution of deep groove and dangerous gully, such construction method is more advantageous. Therefore, practice and research on such construction technology are very practical and significant.Ordinary vertical rotation construction is to have low casting or arch rib assembling, and then lift upward to reach the designed location. Concrete arch rib construction of Zhenzhu Bridge on the road from Wuchuan to Pengshui in Guizhou uses the technology of negative-angle vertical rotation construction, vertical casting arch rib, and then lowering rotation with weight of 610t. Such construction technology is used in China for the first time, while current vertical rotation of the same type of RC arch rib in China has the maximum weight. Based on emphasis on introducing construction technology characteristics of this bridge, this paper also includes innovation and beneficial exploration on the new construction technology of negative-angle vertical rotation.

Abstract: Introduces the design method of a novel impedance transformer, proved its superiority, then optimized this new design method using optimized means, and designed the new optimized impedance transformer whose size smaller about 20 percent and bandwidth wider than the traditional stepped impedance transformer. Therefore, to simplify the design of ladder-impedance transformer and make its broadband larger and its size smaller is very meaningful for the microwave integrated circuits.

Abstract: In order to ensure the safety of the truss, truss structure should be carried out prior to use static loading test for assessing the actual working conditions as well as the truss trusses meet the design. The static load test site carries out the testing work. In this paper loaded static load test program was designed to include load cases and measuring points on the truss static load test a theoretical analysis.

Abstract: This paper considers material nonlinearity and geometric nonlinearity,study in-depth the force performance using the finite element method for space curved steel box girder bridge, through the six series of 20 specimens calculation and analysis, simulation different local structures curved steel box girder bridges reflect more accurately the role of various factors in the mechanical behavior. This in-depth analysis of the different local structures in space curved steel box girder bridge performance, for guiding the engineering design has a certain reference value for further study curved steel linear and nonlinear mechanical properties and stability lay a good foundation.

Abstract: Mobile robot is an intelligent system which can move freely and is scheduled to complete the task in the working environment. Obstacle avoidance of mobile robot is the research hotspot in the control field of the mobile robot. The mobile robot obstacle avoidance methods are classified, including the traditional algorithms and the intelligent algorithms. This paper summarizes the intelligent algorithm in the mobile robot obstacle avoidance technique in the present situation, and the intelligent algorithm which is the most researched in the current. Finally, this paper prospects the development trend of intelligent obstacle avoidance of the robot.

Abstract: Passenger railway line of Xiamen-Shenzhen railway has lots of soft-clay sections. Reinforcement schemes of base soft clay include two forms, cement mixing pile and CFG pile. If reinforcement thickness of soft clay is inappropriate, it makes the base of the built subgrade construction settle and deform. The paper uses ammeter to dymatically control the length of cement mixing pile and CFG pile, which not only effectively ensures that all reinforcing pile shafts can enter bearing stratum, but also improves foundation capability and avoids settlement and deformation of foundation.

Abstract: To simulate the impact response of the moving body in the permanent magnetic actuator, this paper takes the magnetic force of the moving body at different positions as one of the input loads for the impact simulation, which avoids the coupling calculation of the magnetic and impact problem. The static and transient analysis of the magnetic field in the permanent magnetic actuator are implemented respectively to compute the magnetic flux density and their relative errors, results show the moving body in this magnetic field exerts little influence on the magnetic intensity and the influence can be neglected. The force of the moving body with respect to its position can be calculated in the static analysis and then be imported into the impact calculation to obtain the velocity and displacement. By comparing these results with the ones from the magneto-mechanical coupling transient analysis, the difference is small which proves the feasibility and accuracy of the proposed method.

Abstract: Material and design affects the performance of shoes. In this study, according to different materials and designs, plantar pressures of Kappa tennis shoes compare to Adidas tennis shoes were tested, Fifteen male volunteered to take part in this student. After collecting and analyzing these data, the findings came to as follows: (1) There were no difference between Kappa tennis shoes and Adidas tennis shoes, (2) there is no safety risk factor in Kappa tennis shoes, and (3) the testing results showed that the damping part of first metatarsus (M5) of Kappa shoes, arch parts (M2 and M4) and supporting value should be improved.

Abstract: To investigate antiwear properties of straight type diesel engine cylinders, an SRV IV wear tester was used to measure dynamic friction coefficient and wear depth by simulating working condition of cylinder liner and piston ring. The worn surface topography was observed through scanning electron microscope. The results show that the wear of piston ring is greater than that of cylinder in the same pair of friction. In three groups the average friction coefficient and the wear amount of honing cylinder is the minimum, followed by the smooth cylinder. The wear amount of grooves - micropitting composite textured cylinder is the maximum. The main wear form of three groups cylinders is fatigue, accompanied by two body abrasion.