Applied Mechanics and Materials Vols. 271-272

Abstract: The degree of protection/damage of the target is an important basis for the target structure design. In the military field, the target can be equivalent to a target metal plate with the certain thickness. The degree of protection can be divided through the effect of target plate under blast loads. Considering the reflected parameters, the reflected pressure-impulse criterion can be used to assess the damage caused by the blast. Through the combination of theoretical analysis and numerical simulation, the target plate’s pressure-impulse diagrams of different degrees are obtained. The results of the experiments and simulations are found in good agreement, which validates the numerical model.

Abstract: A finite element model of floating raft vibration isolation system are established in this paper. The stress cloud and the natural frequencies are given based on the analysis of the static response and modes of this floating raft vibration isolation system. The calculation and analysis above may be helpful for preventing the floating raft system from working on resonant area and for keeping the oversize dynamic deformation. On this basis, vibration isolation effect has been assessed by vibration level difference

Abstract: The traction infinitely variable transmission (TIVT) used in the power train of electric vehicles (EVS) was designed. Firstly, based on the analysis of basic structure and working principle, the mathematic models were established on the transmission ratio, slipping ratio, transferring torsion and transmission efficiency; Secondly, Transmission characteristics of the TIVT were analyzed and calculated using ADAMS software. The calculation results show that: the export torsion varies with sway angle of steer ring as the import torsion is fixed. The transmission efficiency of TIVT is large when the motion of driving parts is pure-rolling or the slipping ratio is less. The efficiency could be reached more than 99% by rational designing. Theoretically, the driving distance of EVS matched with TIVT could be increased.

Abstract: This paper presents a new cycloid permanent magnet gear(PM gear) based on Halbach array, which has the advantages such as extreme torque density and a very high gearing ratio. And the Halbach array can produce one-sided filed that will increase the magnetic filed intensity. The air-gap magnetic field of cycloid PM gear based on Halbach is got by adopting finite element method. At the same time, to research the torque characteristics, the factors which affect the magnetic torque of cycloid PM gear are studied respectively through the FEM, such as torque angle，offset，thickness of permanent magnets and yoke irons.

Abstract: The digital technology of the stimulation of the toroidal worm is discussed in this paper. In this paper, the technical scheme, the technical roadmap of the digital stimulation of the planer enveloping toroidal worm, the key of the stimulating soft are decided, the function of the digital stimulation software are introduced, too.

Abstract: The national standards of the center distance, transmission ratio and transmission power of the planer enveloping toroidal worm are declared in abroad, but the geometric parameters and the main technology parameters is still calculated by the engineers according the design formula of the design handbook. At the same time, the non-standard parameters of the worm influence the standardization of the cutting tools especially the hob and add many difficulties and work load for the processing of the planer enveloping toroidal worm. The curvity modification theory and the optimization design software of the planer enveloping toroidal worm are introduced. The software is can not only optimize the relative parameters of the planer enveloping toroidal worm but also stimulate the engaged performance of the worm pair. Based on each kind of planer enveloping toroidal worm, the series of optimized parameters are calculated through the optimization design. The parameters which collect within national standards are the seriation and standardization parameters.

Abstract: In the case of the improving economic, people no longer pursue luxury and the copies of other homes in house decoration, but have a higher spiritual level requirements. Interior soft decoration has become an unavoidable mean of decoration in modern house decoration and the important direction of interior decoration. The interior soft decoration art is a dynamic art. Its unity can bring vitality to space and build an ideal interior environment that is full of culture taste and comfort. Interior soft decoration will be the future development of housing decoration industry and the popular trend.

Abstract: Nondestructive inspection should be carried out before a shaft-tube-like part of an important machine assembly. The Ultrasonic Detection Machine was typically designed to detect if a shaft-tube-like part has some imperfection. There are three work posts in this equipment, they work continuously. This approach makes it very easy to split up a complex transformation into a series of simple transformations arranged in a pipeline. The machine includes control system built with SIEMENS CPU224 programmable logic controller (PLC), hydraulic driving system and the ultrasonic detection. Practices show that the prototype built can detect a key part quickly and efficiently before assembled, which is used in military, high pressure vessel, aerospace field and huge bridge, etc.

Abstract: This paper deals with the design and analysis of a three-phase CDROM motor driver chip using a 0.6um CMOS process. An analysis of this circuits system, it is found that the driving current can be up to 500mA as in the three-phase DC motor operation. In the CMOS process, a lot of component, i.e., control and power circuits are integrated in the same chip. Here, we will focus on the design of high-current driver part and present the results obtained from the motor operating at different situations.

Abstract: The nonlinear dynamic model of two-span rotor-bearing system with two cracks in shafts is set up, and the effects of two cracks in shafts on dynamic characteristics of the rotor-bearing system are analyzed. Along with the increase of the crack depth in first span, the chaotic and periodic motions increase, and the quasi-periodic motion decrease in the supercritical rotate speed. There are harmonic elements of 1/4, 1/2 and 3/4 frequency division within the sub-critical speed range at different crack depths. There appears the frequency doubling resonance obviously when the crack depths are larger. Along with the increase of the crack depth in second span, the main influences to the responses of system are in the second span. The chaotic regions increase and then decrease and the periodic motions region increase in the sub-critical rotate speed range.