Papers by Keyword: Tolerance

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Authors: S. Avakh Darestani, M.Y. Ismail, N. Ismail, R.M. Yusuff
Abstract: This paper introduces a method for evaluating material and product quality. The method is developed based on the normal distribution. For quantitative variable, the method divides the tolerance zones to 3 parts according to normal distribution 卤3饾湈 and assigns different scores to tolerance region. For qualitative variables, the method take decision base on the fact that the measurement result can be occurred on two states as accept or reject. Therefore, a Level of Quality (LOQ) will be measured for the product quality based on the measurement of different samples of lot by quantitative and qualitative variables. The method is validated by a numerical example included 2 dimensions.
1714
Authors: Yong Jun Jiang
Abstract: Evaluation of form errors of machined parts is fundamental in quality inspection to verify their conformance to the expected tolerances. Performance of methods have been reviewed in [1].A methodology for maximizing the adherence to the specified tolerances using an integrated machining and inspection system is presented. Considering thedesired tolerance envelope of the part, an error decomposition technique is developed to model machining errors caused by the systematic and non-systematic errors in the machine tool. The model is used to adaptively plan the final machining cuts, based on inspection feedback, to enhance the geometric accuracy of the final product and is illustrated by an example.
535
Authors: Yong Jun Jiang
Abstract: Fundamental to the IMP, is the requirement to provide a harmonized data model and represent it appropriately, including geometric tolerances information that can be understood well by computers and users. In this paper, we propose a layered conformance level geometric tolerances representation model. This model uses the widely applied ASME Y14.5M-1994 as its foundation layer by abstracting most information from this standard. Thus, different application domains in an enterprise can use this data model to exchange product information. This model is further transformed with XML Schema that can be used to generate XML instance file to satisfy geometric tolerances representation requirements in IMP. Fig.1 A typical feature control frame and its possible symbols. Fig.2. Example part.
3961
Authors: Jie Min Tao, You Bao Wang, Jie Dai
Abstract: Chlorophytum comosum seedlings were treated with different Zinc (Zn) concentrations (CK, 200, 400, 600, 800, 1000, 1500, 2000 mg路kg-1dried growth medium) under controlled conditions. Physiological parameters and Zn content of roots and shoots were examined by pot-planting over a period of three months. The results showed that the length of roots, the fresh and the dried weight of plants were inhibited by Zn of all concentrations, while the length of aboveground parts and the volume of roots were stimulated by the lower Zn level. The Tolerance Index (TI) of C. comosum were above 50 in soil of Zn concentration less than 600mg路kg-1. In addition, results indicate that C. comosum can accumulate Pb up to 1093 mg路kg-1 and 4700 mg路kg-1 dry weight in roots and leaves respectively in Zn concentration of soil up to 2000 mg路kg-1.
524
Authors: Hai Ming Kan, Hai Bin Li, Xiao Li Xia, Yan Tao Zhang
Abstract: Torlerance design is one of the most important part in product development, which can affect the quality of product. In order to improve the quality of the products and design robustness, this paper developed an efficient torlerance robust design method on base of the Taguchi Theory. The lossing of fuzzy quality is used to modeling the quality of product, the cost and quality are modeled as optimization objective to finish the torlerrance robust design. An example is also studied to verify the effectiveness of the method.
292
Authors: Chung Yi Chung, Pei Ling Chung, Hwa Sheng Gau, Wen Liang Lai, Shao Wei Liao, Chang Ling Miaw
Abstract: Plants could make the environment beauty and improve air quality. But the plants need adapt to the growing environment. In the industrial area or cities, ozone (O3) is a common pollutant; it could hurt human health and hinder the plants growth . This research used a custom-made fumigation equipment to evaluate the tolerance ability of 7 species of Taiwan protophyte with 200, 400 and 800 ppb O3 gas exposure. The results of this research showed that among all tested trees, Aglaia formosana and Cerbera manghas had the strongest tolerance to O3 and then the Millettia pinnata and Palaquium formosanum, Nageia nagi, Terminalia catappa in series, the Tournefortia argentea was the least.
3908
Authors: Jin Hui Zhao, Li Jie Yin, Li Li Xiong, Xu Qian
Abstract: A good architecture is the basis of system security and stable operation, which can effectively reduce the risk of system construction, and ensure health development. The mobile payment system involves many links; the process is complex and diverse with higher security requirements. Combined with advanced security technology --- tolerance mechanisms, a novel mobile payment system architecture is design. Voting unit and detection unit checks the states of system; management unit restores or reconstructs system to ensure the operation of key services by redundancy of services and equipments; Threshold (n, t) multiplies the difficulty of the attack proxy server to gain access to sensitive information. According to security and performance analysis, proposed architecture is safe and effective.
2539
Authors: Chen Song Dong, Lu Kang
Abstract: Compliant components such as large sheet metal components are commonly used in various products including automotive, aircraft and home appliances. Because of part-to-part variations, deformation and stresses are induced in the assembly process. An approach to the assembly tolerance analysis of compliant structures is presented in this paper. Given component deformation, assembly deformation and stresses are derived by finite element analysis (FEA). The influence of component deformation on assembly deformation and stresses is studied by response surface methodology (RSM), and a regression model is developed. Using the developed regression model, Monte Carlo simulation was conducted to study assembly tolerance and stresses. This approach is illustrated by an example.
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Authors: Chung Yi Chung, Pei Ling Chung, Hwa Sheng Gau, Shao Wei Liao, Wen Liang Lai, Chang Ling Miaw
Abstract: Italic textThis research utilized a custom-made air fumigation equipment to evaluate the tolerance of 10 species of side-walk trees with 600, 1000 and 2000 ppb Sulfur Dioxide (SO2) for 48 hours. The tolerance of tested trees toward SO2 pollution was analyzed. Results showed that these plants influenced by high concentration SO2 gas with physiology properties changes and the decrease of photosynthetic rates and the stomata conductance than before fumigation. The net photosynthetic rate and stomata conductance of tested trees was linearly correlated to each tested tree species. Among tested tree, the Quercus glauca had the highest tolerance in exposure with high concentration of SO2 pollutant. While the Camellia axillaries was the least.
5423
Authors: Nidhi Srivastava, Biswaranjan Dhal, Abhilash, Banshi Dhar Pandey
Abstract: The presence of soluble Cr(VI) particularly in the overburden soil samples of the chromite mines area is about 300-500mg Cr(VI)/kg. The level of Cr(VI) in final effluents needs to be reduced to the permissible limit <0.05mg/L (USEPA) using appropriate technology before it is discharged into the soil. Out of 12 bacterial isolates from the mine samples, CSB-9 was proven effective in reducing hexavalent chromium to its trivalent form with its inherent ability to survive proficiently in 200ppm Cr(VI). The isolate, confirmed to be Bacillus cereus, was characterised as gram-positive and capsule forming with the optimum growth at pH 7.0 and 35掳C. The process of bioreduction of Cr(VI) using B. cereus was optimized with various parameters, viz., pH, initial concentration, dosage of adsorbent, temperature. The bacterium gave 90% reduction from 100ppm Cr(VI) aqueous feed in 120h at pH 7.0, 35掳C using 1% (v/v) cells/mL.
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