Advanced Materials Research Vol. 510

Abstract: This paper to the resonant vibration conveying material on the effect of the shock of geologic detailed analysis to research, perfect the resonant vibration against the motive of the dynamic model. Application of the method of harmonic balance system dynamics equation of solution, and draw the conclusion that, under geological body dynamics of the zoom factor amplitude frequency response curve. A test bed to the actual parameters is simulated, on the test, the displacement of the geological time response curve. The results show that: consider material impact and without considering the impact of material, compared the antiresonant frequency decreases, and in the near antiresonance point, the amplitude becomes big bodies.

Abstract: Usability is the basic properties of the product, and it is the overall evaluation to the product usability. In this paper, firstly, establish a usability evaluation index system of the welding clamp. Then, use the improved fuzzy synthetic evaluation method to assess the usability of welding clamp. In an improved fuzzy synthetic evaluation model, the index weight which is identified by using AHP method is amended objectively by using entropy technology, the resolution ratio is improved by classifying the differences between qualitative indexes and quantitative indexes. Finally, get the evaluation results of the usability of a welding clamp according to the method above. The result is to some extent valuable, in terms of theoretical research, for improving the usability of welding clamp.

Abstract: According to the non-probabilistic finite element algorithms, the random finite element equations are translated into the interval finite element equations. Firstly, with the concept of confidence interval in the probability, a interval number can be taken as the random variable with the uniform distribution. Secondly, the uniform random Monte Carlo (MC) finite element method and optimization finite element method are presented. Finally, the example shown, when the numbers of random parameters are small, the two algorithms are all effective. But when numbers of random parameters are large, only the uniform random finite element method has the stabilized solving ability.

Abstract: In this paper, the optimization model of ultra high electromagnetic ball valve is established, and using the MATLAB optimization toolbox for optimization calculation. Then the optimum results of relevant structural parameters are compared with C++ prepared random direction method. It shows that the optimal design model of electromagnetic ball valve is correct. So we can draw a conclusion that using MATLAB optimization toolbox to optimum design is feasibility in the hydraulic component design through an engineering example of ultra high electromagnetic ball valve. The optimization results show that the optimization design based on MATLAB optimization toolbox has high precision, the program is simple, the calculation is fast, and the optimal solutions have a high accuracy and reliability.

Abstract: The first use of UG modeling tool to complete the shark 3D modeling; then using UG software to complete the automatic programming automatic programming function, and generates 3 axis machining program, then use the Yulong NC simulation software for NC machining simulation, validation procedures for the procedure to import CNC machine tool by processing, difficulty of shark processing fashion clamp design and processing.

Abstract: This paper has mainly concentrated on the abutting joints corner joints and lap joints of TCS stainless steel, which are produced by TaiYuan steel plant. It has used group method and fluctuation method to test the fatigue limits and p-S-N curves under 95 percent degrees of confidence and 90 and 50 percent degrees of fraction surviving of the six types of joints. These will give technique assurance and data support to welding bogie design. It has also used scanning electronic microscope to observe the typical specimen. The fatigue source and cracking reason of the specimen which will provide reference for welding methods for increasing fatigue strength of such welded joints and establishing the welding procedure were analyzed. The research in this paper will provide basic data for the applications of TCS stainless steel in new heavy load wagons.

Abstract: Since boom-type aerial equipment has complex dynamic characteristic under the action of random wind loads, traditional methods are hard to reflect its dynamic response. We put forward an analysis method for wind-induced random vibration response of aerial working arms based on finite element and pseudo-excitation methods. In this analysis, the pulse-wind-load-induced vibration was regarded as a random vibration under multi-point coherent steady random excitation, and Davenport wind speed spectra invariant with height were adopted with consideration of multi-point wind excitation correlation. We analyzed the wind-induced random vibration of the working arm of a folding-arm-type aerial operation vehicle. The analysis results confirm the reliability of the analysis method, so as to offer a feasible way for analyzing the dynamic wind-induced vibration response of large boom-type aerial equipment.

Abstract: Car frame which is usually made of up beam, down beam, upright, cradle beam and bracer is bearing structure part which has a high intensity and stability requirements. Through research 2.5 tons, 4 high speed elevator's car frame, car frame's up beam, down beam, upright and cradle beam are designed by channel steel. In order to reduce the material cost of car frame based on the precondition that wouldn't influence frame's the stability and safety. First, Treating with the software SolidWorks establish 3D modeling. Second, by using the Plug-in COSMOS exert restriction, load and divide gridding meshing on the new car frame structure. After FEA gets stress cloud, strain cloud and safety factor cloud which provide the theory evidence of the new structure. The analysis of COSMOS shows the feasibility and stability of new structure. It can works on the condition that car frame keep steady and safe with material cost to lower, which has special significance on production practices.

Abstract: In order to improve the vibration problem arise when rotational speed of a ball screw is increased, an analytical model is proposed to study the nonlinear dynamic behavior of the ball screw with preload considered. The contact force of each rolling element described according to nonlinear Hertzian contact deformation and the re-circulating mechanism has been taken in to account. A end-type ball screw is selected as an example, the methods of Runge-Kutta-fehlberg is used to solve the equations of motions numerically. It was found that the preload can be useful in controlling the vibration of the system,but the inhibit effect is not proportional to it,in the light of different type of ball screw, corresponding prevention preload is recommended.

Abstract: For improving the stability of kernel and husk separation machine of rapeseed, we had done some experimental research about vibrating fluidized classification technology. Based on experimental dates we had built the mathematics model and analyzed the classification effect influenced by the amplitude, the frequency and the material thickness and their interaction .The results indicated that when we maintained installation angle α = 0^o and vibration direction angle β =108^o of the vibrated fluidized bed, the best optimized combination of factors was the amplitude x₁ = 1.87mm, the frequency x₂ = 52.53Hz and material thickness x₃ = 22.36mm.