Papers by Keyword: Impact Analysis

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Authors: Gwo Chung Tsai, Kuo Yi Huang
Abstract: Light alloy disc wheels are used in daily transportation very extensively, wheels need not only an artistic external, but an excellent performance that up to standard. According to Chinese National Standard-CNS 7135 [1], this paper study about 13° impact test by using finite element software – ANSYS, applying theory of elasto-plastic mechanics, and considering the effect of tire absorption. So we estimate the absorption percentage of tire effect in three cases, 0%, 20%, and 40%. By Reducing the striker kinetic energy to compensate for tire absorption, and after the analytic results compared with the experimental results, the analytic results can put to the proof.
Authors: Yoichi Yuki, Hiroki Tamai, Naoki Wada, Yoshimi Sonoda, Toshihiro Kasugai
Abstract: This paper presents a novel pin-fixed aseismatic connector for bridges. A feature of this device is that the anchorage areas of both ends are connected with hinges; thus, there are no restrictions with respect to their mounting angles. Additionally, the PC cable of this device is given an appropriate amount of sag; thus, within the range of the sag the structure is capable of absorbing the amount of displacement because of temperature changes and live loads. In addition, this device has a certain shock-cushioning effect because of the rubber material surrounding the hinge pins. However, there is no quantitative evaluation method on the shock-cushioning effect of this device. Therefore, in this study, the shock-cushioning effect of the novel pin-fixed aseismatic connector for bridges is investigated using impact load tests and numerical analysis. It is found that the shock-cushioning effect of this device is almost equal to similar aseismatic connectors. Furthermore, it is also confirmed that their effects can be quantitatively evaluated using impact response analysis.
Authors: Yun Liu, Chong Peng
Abstract: With the broadening and deepening of economic development, the urban growth of many small cities begins to present sprawl in China in the new century. Replacing the original act of urban planning, the Town and Country Planning Act became effective in 2008. This paper compares the contents of the two acts, and especially analyses the stipulations about urban land scale and spatial construction activities from the perspective of the revised legislation. Based on the introduction of the master plan of Lianjiang Town in Fujian Province, the paper holds that China can take advantage of the legal effect of the new act to make the master planning of small cities more cautious and rational, as well as to promote the popularity of smart growth concept in small cities.
Authors: Mohd Khairol A. Arifin, Nik Mohd Idham Nik Hassan, Mohd Firdaus Abdullah
Abstract: The study is intended to measure the reliability of MPV dashboard to endure interior impact by using finite element analysis (FEA) method. A model which represents MPV dashboard was made using Solidworks and the impact simulation was done using ABAQUS. Current material being used for dashboard is ABS-GF40 and this material was proven to be reliable to withstand interior impact through the simulation that has been done in this study. Besides, this study also serve the purpose to reduce manufacturing cost using alternative materials with no less reliability compared to ABS-GF40. Similar simulation routines were applied for ABS copolymer, PP copolymer, and PVC copolymer. The simulation results showed that ABS-CF40 performance is similar to ABS-GF40, whereas the PP-CF10, PP-GF10, and PVC-GF30 exhibit almost identical behavior under impact loading. Cost assessment was carried out for all materials to assist in selecting alternative material for replacement of ABS-GF40. Hence, it was found that PP-GF10 can be used as an alternative material with cost reduction up to RM33.17 on each dashboard.
Authors: Xiang Dong Yang, Xin Wei, Xiao Zhu Xie, Zhuo Chen, Wei Bo Zou
Abstract: This paper studies the chemical mechanical polishing (CMP) of the wafer's material such as stainless steel, monocrystalline silicon etc, and analyzes how the technological parameters’ impact on the final wafer’s surface material removal rate, surface quality and surface damage like the polishing pad’s speed and the wafer speed, polishing pressure and polishing time.The results show that: when the difference between the polishing pad's rotation speed and the wafer's rotation speed is small and their directions are the same , then the material removal rate of the wafer is larger.when the polishing pressure is selected between 5 to 6.5 kPa, the wafer surface's damage is smaller.The polishing time also play a very important role and affect the surface quality and surface damage of the wafer after polishing.
Authors: Ying Ying Sun
Abstract: With the development of electric vehicles technology, especially the development of battery technology and strongly supported by some developed countries in terms of policy, electric vehicle has undergone a rapid expansion in recent years. A lot of electric vehicles are popularized and applied, which will have an impact on power system especially the distribution system. Therefore it is necessary to study the demand characteristics of electric charging and the treatment method and model of access to the network. With this understanding, this article studies the power output model of electric vehicle and analyzes the impact to the distribution network load, the network loss and voltage with different electric vehicles capacity.
Authors: Harijono Djojodihardjo, Hamed Jamali, Alireza Shokrani, Faizal Mustapha, Rizal Zahari, Surjatin Wiriadidjaja
Abstract: Impact resilient structures are of great interest in many engineering applications varying from civil, land vehicle, aircraft and space structures, to mention a few examples. To design such structure, one has to resort fundamental principles and take into account progress in analytical and computational approaches as well as in material science and technology. With such perspective, the first objective of this work is to develop a computational algorithm to analyze flat plate as a generic structure subjected to impact loading for numerical simulation and parametric study without considering the surface impact effect. The analysis is carried out from first principles for static and dynamic analysis; the latter is based on dynamic response analysis in the elastic region. The second objective is to utilize the computational algorithm for direct numerical simulation, and as a parallel scheme, commercial off-the shelf numerical code is utilized for parametric study, optimization and synthesis. Through such analysis and numerical simulation, effort is devoted to arrive at optimum configuration in terms of loading, structural dimensions, and material properties, among others. The codes developed are validated for generic cases. Further simulations are carried out using commercial codes for some sample applications to explore impact resilient structural characteristics in the elastic region.
Authors: Lei Wang, Sui Gao Ye, Jian Hua Ye, Fang Chun Lu
Abstract: River play a very important role in regional landscape structure as an ecological element and corridor, and vegetation is very important for the healthy eco-system of a river. The advances of the research and application of near nature river training and vegetation measures were reviewed. The concept, content and function of ecological river training and near natural river training were discussed.. According to the principle of landscape biology, the positive influence of river vegetation on biodiversity was analyzed through edge effects, corridor effects and interference effects. On the basis of in-site experiments of more then ten sample rivers for years, it was concluded that to meet the needs of biodiversity conservation and maintain river ecosystem healthy and steady, in the design and construction of a river, the ecological function should take into due account, proper habitat conditions for plants and plant communities should be created through suitable plan layout, cross section, slope structure and construction material.
Authors: Hong Seok Lim, Hong Hee Yoo
Abstract: Flexible structures undertaking impact while undergoing overall motion can be found in several industrial products these days. Transient motion and stress induced by impact should be considered elaborately to extend the life of the products. In the present study, a modeling method for a flexible beam with a tip mass that undertakes impact while undergoes large overall motion is presented. The tip mass takes the impact force and the transient responses of the beam are calculated by employing the assumed mode method. The stiffness variation caused by the large overall motion is considered in this modeling. The effects of the tip mass and the angular speed of the beam on the transient responses are investigated.
Authors: Byung Sun Kim, Dock Jin Lee, Ja Choon Koo, Jae Boong Choi, Young Jin Kim, Jong Nam Lee, Young Bee Chu
Abstract: As the TFT-LCDs are getting more attention for the next generation display device, specifications of the mechanical functionalities of the device is to be more tighter as well as the electrical user specifications. Due to its brittle characteristics of TFT-LCD panels, maintaining mechanical integrity under an impact loading situation is the one of the key design concerns. Furthermore, as the TFT-LCDs are popularly adopted for various mobile equipments such as cellular phones and digital cameras, shock failure of the display should be prohibitive for the design engineers. A major incident being monitored during the shock loading is of course the local material failure of the TFT-LCD panel that might happen at its maximum deformation. The present work delivers a systematic approach for the shockproof design of mobile TFT-LCD. A specially designed shock test setup evaluated by a set of rigorous FEM analyses is shown and comments for the shockproof method is to be also delineated.
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