Advanced Materials Research Vol. 744

Abstract: To study the influence of different resistances on curve jointless line with allowable temperature rise, three kinds of finite element models are established by ANSYS to calculate the allowable temperature rise respectively with 2mm lateral displacement in five different curve jointless lines when both longitudinal and lateral resistance are nonlinear. And then we compare the results of three finite element models with that of wavelength equal model. It is shown that the effect of resistance on the allowable temperature rise of curve jointless lines goes less as the curve radius becomes longer. These 3 finite element models can be adopted to analyze stability of curve jointless lines. Considering the difficulty in model and computational efficiency, the second model in the thesis is highly recommended when analyzing the stability of curve jointless lines.

Abstract: In this paper, the free modal of the industrial flat sewing machine was researched, and the experimental measurement system is established. A modal analysis of industrial flat sewing machine is carried out through the method of single point exciting vibration and multipoint collecting signal. The PolyMax modal parameter identification method is applied to the modal analysis for frequency response function to get steady state diagram and then determine the modal parameters and modal shapes. According to Modal Assurance Criterion (MAC), the credibility of the calculation results is verified, and then modal parameters of industrial flat sewing machine get more reliable in order to provide the reference for further structure optimization and noise reduction of the flat sewing machine.

Abstract: Submarine escape capsule is an effective equipment to improve submariners viability when accident. In order to design a reasonable escape system, three alternatives, sphere chamber, ellipsoid chamber and combined chamber, were presented in the conceptual design process. The factors which influenced decision making were researched subsequently, such as general performance parameters, dependence on submarines position when releasing, safety of the product in hazardous conditions and the products influence on submarine. Then the influenced factors and their attributes were evaluated in three alternatives, and a multiple attribute decision making approach based on entropy weight was used to optimize the conceptual design. The results showed that combined chamber was the best choice for submarine escape capsule because its overall technology level was superior to others.

Abstract: For the degree of thermal deformation nonlinear is high and difficult to predict, fuzzy neural network modeling (FNN) based on Takagi-Sugeno model was applied to the NC machine tool thermal error modeling thus the complete thermal error fuzzy neural network mathematical model on NC machine tool was established and network parameters initialization and learning method were discussed. Thermal error experiment was conducted on large NC gantry rail grinder spindle box system and two independent groups of spindle thermal error data were collected, one was used to establish thermal error fuzzy neural network prediction model and another one was used to verify the prediction accuracy of this model. The test results show that fuzzy neural network model has high prediction accuracy.

Abstract: virtual prototyping technology 1980s developed a computer-aided engineering and virtual prototyping technology applications in the research and development of self-moving tail can greatly enhance progress in the development of the mechanical design of fully mechanized coal miningthe surface level of mechanization upgrade of great significance.

Abstract: This paper mainly targeted double roll calender equipment vibration problem of study, using numerical simulation method, investigated the rollers, stents and modal of the whole machine. Conclusion as follows: (1) for the rollers are concerned, turning to the rollers inherent frequency influence is small, can be ignored. (2) stents have not only the front and back, the or so direction of the bending vibration, and torsional vibration, these vibration will influence support the intensity and rigidity. (3) the whole machine is the main complex vibration mode, stents vibration performance for concurrently bending torsional vibration, with vibration frequency increases on the rollers showing torsional vibration.

Abstract: The Vic-2D is an innovate system that uses a non-invasive method called Digital Image Correlation (DIC) technique, which provides a contour map of strains of an entire specimen surface subject to mechanical tests, based on gray value digitalized images. The paper presents the results of experimental investigations of the constitutive behavior and damage evolution in the fracture process zone (FPZ) of concrete using the Vic-2D, in comparison with the traditional strain gauge method. The model tests were performed with notched concrete specimens via the Wedge Splitting Test (WST) method. During the tests, stress-strain curves and evolution of the damage variable were determined and analyzed at multiple levels. The results provide the achievements obtained and some limitations with both two methods.

Abstract: This thesis studies how reinforced steel completes digital length design after being straightened.In general,the analysis of kinematic and dynamic to reinforced steel does not be considered the role of the flexible components in institutional kinematic. The program regards reinforced steel as a flexible body and sees friction wheel as rigid body. The contact between friction wheel and steel is the rigid-flexible coupling[3].With the simulation analysis in ADAMS,I research the problem that reinforced steel produces the slide or not in different speed and contact friction coefficient, in order to determine the design and operating parameters of the cut-to-length body and ensure the accuracy. The result has a good engineering significance in the design of the length structure optimization and operating parameters [4].

Abstract: MEMS vacuum packaging now is the impediment of the MEMS appliance in some specified fields. The major problem of current packaging approach is that the packaging process can not match the requirement of the ultra low leak. But the process now can not be improved with the existing technology. In this situation, authors proposed a novel approach for MEMS vacuum packaging, which can remarkably lower the leak rate. This paper analyzed the vacuum maintaining time of the vacuum packaging and compared the current design and new packaging method.

Abstract: In this paper, the optimization of floating crane balance system metal structure is main research purpose. So, firstly, optimization design mathematical model of floating crane balance system is constructed concretely under the multi-objective circumstance. Secondly, the optimization results are obtained based on genetic algorithmic, the optimal result are compared to the non-optimized value and the value reduces 16.74%. Finally, according to the resistive overturning stability requirement of floating crane, the optimization results are to be stability checked, so the rationality of optimization results are to be proved.