Applied Mechanics and Materials Vols. 380-384

Abstract: the automobile constant velocity universal joint driving shaft is the important component in modern cars, its design is mainly to check the movement compatibility of parts. The constant velocity universal joints driving shaft is designed by three-dimensional solid modeling software UG, and the motion simulation model is build by multi-body dynamics simulation software to investigate the constant speed performance of constant velocity universal joints driving shaft, and check the motion trace of steel ball which is the key component of constant velocity universal joints. The results show that the constant speed performance is good, and the track design of star-like inner race is reasonable.

Abstract: A type of new environmentally friendly lube additive---boron-nitrogen modified soybean oil was synthesized and characterized by infrared spectrum. Its effect on the friction and wear behavior of steel-steel and steel-aluminum alloy systems were investigated with a four-ball machine and an Optimol SRV friction and wear tester respectively. The morphographies of the worn surfaces were analyzed by means of scanning electron microscopy (SEM).The worn surfaces of the 2024Al alloy block were analyzed by means of X-ray photoelectron spectroscopy (XPS).The results show that the type of modified soybean oil as additives can obviously decrease the wear rate and friction coefficient of steel pair and steel-aluminum frictional pair. Its lubrication mechanism is inferred that a high strength adsorption film and/or tribochemistry reaction film on the worn surface of the Al alloy due the carrier effect of a long chain soybean oil, high reaction activities of nitrogen, electron-deficient of boron and their synergisms.

Abstract: In this paper, the overall requirements for the design of the drive bridge is analysed, the programme of the structure on the drive axle assembly and component parts is studied. The overall design and programme design on the drive axle assembly is finished; the basic structure of the double reduction final drive and the middle tandem axle is ensured which refers to the structure of the reference model CA1092; The basic components on the drive axle assembly are designed. The calculation of their basic geometric parameters is finished, and the strength of the parts which have greater impact on the overall strength is checked; and the remaining components are designed briefly. The paper gave a briefing on the characteristics of Solidworks 2008 software and virtual assembly technology. Introduces three-dimensional maps of parts which are draw by SolidWorks software and describes drive axle assembly by the form of diagrams.

Abstract: In this paper, through the study of traditional light bus, found problems related to screening and using existing methods, bridge drive of light bus was designed. First determine the drive axle transmission ratio and reasonable distribution; secondly on the driving axle main transmission device structure and parameter design, including the design of main reducer, differential, half shaft design; finally completed the design of driving axle housing, in order to design the drive axle complete. And the use of traditional mechanical analysis methods of main parts of the driving axle ( reducer, differential, half shaft, axle and so on) for the strength analysis and calculation, including the gear bending stress calculation, strength check; gear contact stress calculation, strength check; half shaft torsional stress calculation. With the design idea and the design requirements of the rapid development, the three-dimensional design has become a necessary skill for designers, this paper introduces the basic functions of Pro/Engineer software and a simple application, and the design of the parts of the drive axle using the software.

Abstract: Due to tractor trailers cost-efficient features, its share in the road transport market is increasing. But its multi-axis structural design is unsatisfactory. There is poor performance and drivability problems, which greatly limiting its further development. This has become the focus of researchers. This paper elaborated the status of tankers dynamics research home and abroad. The key technology and future development direction are pointed out in the field of tankers dynamics research.

Abstract: Based on the model of aircraft carrier "Kitty Hawk", a study on the influence of resistance performance and main elements was carried out. A designer will find out the elements effecting the aircraft carrier designing through its coefficient of L_ω/B_ω and block coefficient. With the change of coefficient of L_ω/B_ω and block coefficient improved by the law, the resistances were calculated. The objective of the optimization is to minimum resistance, optimal rapidity, also give a consideration to stability and seakeeping performance, optimizing the main dimensions with the restrictions of flight deck width. The speed of the optimal ship has increased from 32 kn to 35 kn. Compared with the parent ship, the main dimensions of optimal ship decreased while have performance improvement.

Abstract: Helicopter lift system aerodynamic design is the key to success helicopter design technology. Currently helicopter lift system has complex structure, fuel consumption, low efficiency and many other issues, which greatly limits its potential to play, so the research of new efficient, simple and practical helicopter lift system is imminent. In this paper, a new kind of helicopter-lift device, combined with the whole structure, the specific presentation of the entire lift device works and ways of working. Based on 2D N-S equations and Spalart-Allmaras turbulence model, the device numerical simulation of two-dimensional aerodynamic characteristics. The results showed that: The lift device is feasible, can be applied to the helicopter technology. The results can lift device is designed for the helicopter to provide certain technical reference.

Abstract: In the paper,using geometry and integral knowledge, the functional relationship is determined between standard oil height and oil storage capacity when oil tank doesnt change position.Then we study that the location of tank can incline in vertical direction furtherly, and compare the theoretical calculation with experimental data .Finally, factual oil storage tank model is discussed.

Abstract: This paper establishes a parametric model on the motor hanging seat structure by pro / ENGINEER software, and then optimizes the structure of the hanging seat by the weight of the hanging seat as the objective function. Taking into account the stress and displacement constraints in the optimization process, the weight of the hanging seat is greatly reduced after being optimized. It is practical significance to save a large amount of raw materials for the mass production and to reduce production costs and create higher economic efficiency.