Applied Mechanics and Materials Vols. 184-185

Abstract: Based on the designed, packaged high-g acceleration sensor in measuring demonstrated sensor performance between individuals have big difference, Researched this problem, through the analysis that the main reason of this problem appeared in the sensor package process of Die process. Through ANSYS simulation and experimental test on two aspects of the analysis the die adhesive’s amount of Die process is the high-g acceleration sensor in testing large performance differences were the main factors. Packaged high-g acceleration sensors with die process of quantitative die adhesive were designed and tested their performance. The result showed that, the simulation results were consistent with experimental results.

Abstract: Ground gathering pipelines in a high flow-rate gas condensate field were seriously corroded and became perforation only after five months operation. The results of witnessed inspections and analysis showed that T-branch pipe, Elbow and weld were corroded most seriously. The main features of the corrosion were trench-like corrosion pits. In order to clarify the reasons for corrosion so seriously, XRD, SEM, EDS were used to test the film of sample which was taken from the field. The results showed that wall thinning of pipelines was mainly caused by CO2 corrosion combined with erosion and the corrosion product was mainly composed of FeCO3.

Abstract: We build the deformation integral model of the actual storage tank and estimate the deflection parameters by using nonlinear least squares based on experimental data. The accurate calibration value of the tank capacity table of the actual storage tank is calculated.

Abstract: Detecting rotor position is an important part of work of magnetic suspension spherical reluctance motor． It contains rotor's position and orientation detection． This paper creates three-dimensional coordinate system on spherical reluctance motor， derives the description of the rotor's position and orientation and proposes a method for calculating rotor's position based on radial displacement sensors and angular displacement transducer． It also uses this approach and the spherical geometry relation to calculate orientation matrix of rotor according to the data from the sensors， so we can work out the position of any point through the rotation of coordinate system and position transformation．

Abstract: In the research of using arc spot welding to connect roof-hood and skeleton of bus, the semi-self-automatic welding equipment for bus roof-hood has the advantages of easy to operate, high quality, low cost, small deformation of work-piece in heating welding and so on. So, it can be used in enclosing roof-hood and connecting skeleton of bus. This research aims at the solution to some key technical problems of designing, manufacture and debugging of semi-self-automatic welding equipment for bus roof-hood skin, as well as selecting proper connecting construction, improving technology, modifying design and enhancing quality of spot weld. The equipment design includes of gantry frame system, positioning fixture system and welding system. The success of developing semi-self-automatic welding equipment for bus roof-hood will solve the problem of the production technology for bus roof-hood.

Abstract: Based on study of animal-claw morphology, a multiplex-modality subsoiler is designed with an intention to decrease its operating resistance. Design concepts and structure scheme of the subsoiler are presented. To analyze the performance of multiplex-modality subsoiler, a multiplex modality sub-soiling shovel and a national standard regulated arc-shape subsoiler (JB/T 9788-1999) are tested in soil bin. Effect of tillage depth and operating speed on the operating resistance of sub-soiling shovels is examined. Type of subsoilers, tillage depth and forward speed, with 2, 3 and 3 levels taken respectively, are considered in experiment. Experiment results show that the multiplex-modality subsoiler, compared with the standard arc-shape subsoiler, sees much lower operating resistance and power requirement against soil. Resistance-decreased index of the multiplex modality subsoiler are 45.3%, 34.4% and 34.2% at 300, 350 and 400mm cutting depth, respectively.

Abstract: In order to research the influence of the main parameters of Dual Mass Flywheel to the torsional vibration of the transmission system, one heavy vehicle was taken as the target vehicle and its dynamics models of transmission system in the idle conditions and the driving conditions were established by ADAMS.Then the main design parameters of Dual Mass Flywheel were gained through simulation and optimization.Finally,a new Dual Mass Flywheel,whose vibrating springs are distributed on both sides of the damping disc,was designed and its damping effect was studied through simulation research.

Abstract: Physical dimension and mechanics properties of Bali pineapple samples were measured. Statistic results show size difference of vertical height is minimum, size difference of transverse diameter is maximum. For ensuring gripping stability and precision, the pineapple end- actuator was designed according to transverse diameter. Static compression test results show elastic deformation firstly occurs when the compression load is small. As the load increases to a certain extent, rupture and yield failure gradually generates. With maturity degree increase, limit compression strength reduces. Influence of maturity degree on limit compression strength is extraordinary significant. The pineapple should be harvested in time considering of maturity degree. The larger the pineapple transverse diameter is, the less the limit compression strength is. For those pineapples with same maturity degree, influence of transverse diameter variety on limit compression strength is not significant. The clamping mechanism chooses sliding-lever double-fulcrum structure. When its finger lever angle  takes 35, center distance of the two fulcrum 2a is 110mm, v-shaped groove angle is 120，finger lever length takes 135 mm, clamping error requirements can be satisfied, and the optimized deflection angle  is 87.6. Clamping force analysis shows that the designed picking end-actuator can ensure no damage clamping for pineapple.

Abstract: The subsea connector for manifolds is working in bad conditions. The water environment is harsh. And the inner pressure of the jumper which is connected by the subsea connector is high. In this paper, a new design of metal gasket for the connector is proposed. The metal gasket develops a surface contact with the upper and lower hubs. Under the effect of internal pressure, the seal ring will expand outward to ensure good seal performance. The design has a simple structure, and is easy to manufacture and disassemble .This paper uses the finite element analysis to investigate the gasket’s performance in different working conditions, and provides reference for real tests and the engineering application.

Abstract: Abstract: In order to achieve the design of micro-machined micro- mechanical cantilever beam of variable cross-section through the PRO / MECHANICA micro-mechanical variable cross-section cantilever beam to mathematical modeling , analysis model , a standard static analysis , the primary design model , the local sensitivity analysis, global sensitivity analysis and optimization design aspects . By the analysis of research data , this body design is feasible and adaptable stress distribution characteristics of a good , good appearance of the structure .