Advanced Materials Research Vols. 926-930

Abstract: The steady state parameters of permanent magnet linear synchronous motor (PMLSM) has an important influence on the performance of the motor. Based on a linear permanent magnet horizontal motion synchronous motor, the paper adopts multi-layered model method to give the formulas of the air-gap flux density that the permanent magnet and armature winding act on alone, no-load back electromotive force, the thrust force in steady-state operation and vector control of thrust in the dq model equation, then compute the value of these parameters according to the formulas, and the finite element method (FEM) to each parameter is validated, the simulation curve is given, the experimental value is also done to prove the exactness of the two methods.

Abstract: This article introduces the injection mould design of mobile phone back shell. The mould adopts 3-plate mold structure, pin-point gate for feeding in the glue, ejector pin and pieces for stripping. The under-cut at the side edge adopts 3-side sliding block molding, and the cooling system adopts “U”-shape coolant gallery. It is proved by production practice that the mould structure is reasonable, stripping smoothly and the plastic parts quality meets the design requirements.

Abstract: On the basis of Hamilton principle, the equation of the solid-liquid coupling vibration of pipe conveying fluid is deduced. The formulas of the offshore pipeline natural frequency are established by used of direct method. The effect of flowing velocity and the elevated temperature on inherent vibration frequency of offshore pipe conveying fluid is analyzed.

Abstract: The locomotive wheelset running with a high-speed, the wheels and axles of wheelset usually assembled by interference fit, the radial contact stress produced by interference cause the friction on the contact area, the axial force and torque of the wheelset transmitted by the friction. The value of prestress produced by the magnitude of interference change small in each load case, and it plays the main role in total stress of wheelset. So it’s very important that choosing a appropriate interference for the wheelset assembly base on the results solved by the finite element contact analysis.

Abstract: To investigate how the conventional speeds to affect passenger cars ride comfort under a kind of road surface profiles, in multibody dynamics software (ADAMS/Car), a vehicle model was built based on the characteristic parameters of a passenger car. According to the relevant test regulations of ride comfort, the building methods of road surface profiles were discussed. Furthermore, a dynamics simulation analysis of the car was realized by ADAMS/Car and the acceleration-time histories of the seat surfaces X/Y/Z-axis under three conventional driving-speeds were acquired. A special MATLAB program was compiled to calculate the total weighted Root Mean Square (RMS) value by calling the above histories. According to the GB/T 4970-1996, a road test of a passenger car was carried out in the random road surface which equivalent to B level. The car was driven to get the values of total weighted acceleration RMS under three conventional driving-speeds. By comparing the road test result with simulation, the result indicated that the changing trend of total weighted RMS value is consistent as the driving-speed changes, and the ride comfort will decrease when the driving-speed increase. At the same time, it shows that the consistency of the simulation and road test is better.

Abstract: The two different fabrications of the Micro-Electro-Mechanical Systems (MEMS) mirrors were compared: a single-crystal-silicon (SCS)-based micromachining and a silicon-on-insulator (SOI)- based micromachining. While the SOI parts had significantly smaller curved device appearance, they were outperformed in most areas by the SCS parts. This was due primarily to the smaller stress factor in the device layer in the SOI parts compared to the polysilicon layer used in the SCS parts.

Abstract: Currently, the seismic wave technique increasingly used in mineral exploration, detecting buried targets etc. Conventional seismic wave excitation technique has many drawbacks. This paper summarizes the advantages and disadvantages of various seismic wave excitation technology, practical applications may need to select the appropriate source technology in order to stimulate better results.

Abstract: Test and study of aluminum alloy helicopter deck under static load were carried out. The deck is made of aluminum alloy sandwich panel. In the experiment, the deflection and stress of deck are measured under different static load conditions. Load conditions are determined by the conditions that helicopter berths at the deck. When helicopter berths at the deck, the deck endures vertical compressive loads on the deck surface and diagonal tension loads on the tie-down rod which is used to fasten the helicopter. According to the test results under different load conditions, the characteristic behavior and ultimate load carrying capacity were analyzed. Based on experimental results, FEM simulation was made. The results of FEM analysis was agreed with the test results very well. It is shown that the helicopter deck which is composed of aluminum alloy sandwich panel has good mechanical performance.

Abstract: The relations between Electric Vehicle (EV) drive arrangement and efficiency of regenerative braking were discussed. Firstly, conclusions were concluded according to the analyses of theoretical models. And then the validity of conclusions was proved by the simulations basing on the software of MATLAB/SIMULINK. The results indicate that the EV with four-wheel drive (4WD) pattern has the highest efficiency in regenerative braking mode. It also shows that whether the EV with front-wheel drive (FWD) pattern has higher efficiency than the EV with rear-wheel drive (RWD) pattern in regenerative braking mode depends on the braking force distribution coefficient.

Abstract: At present, China's key oil and gas exploration and development was directed to heavy oil reservoirs and reservoirs in remote areas. As the main mechanical oil recovery equipment, pumping unit in general has some shortcomings in developing these kinds of reservoir, such as high energy consumption, short maintenance cycle, high cost of production management, and not suitable for remote area of harsh environment. In view of the deficiencies of the existing oil pumping unit, a new type of energy-saving pumping unit is designed with high efficiency and energy saving, stable and reliable, long pump inspection cycle, convenient maintenance and low-cost. It can fully meet the needs of production and maintenance for viscous oil wells and remote wells.