期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
Improved Quality Prediction Model for Multistage Machining Process Based on Geometric Constraint Equation 被引量:5
1
作者 ZHU Limin HE Gaiyun SONG Zhanjie 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2016年第2期430-438,共9页
Product variation reduction is critical to improve process efficiency and product quality, especially for multistage machining process(MMP). However, due to the variation accumulation and propagation, it becomes qui... Product variation reduction is critical to improve process efficiency and product quality, especially for multistage machining process(MMP). However, due to the variation accumulation and propagation, it becomes quite difficult to predict and reduce product variation for MMP. While the method of statistical process control can be used to control product quality, it is used mainly to monitor the process change rather than to analyze the cause of product variation. In this paper, based on a differential description of the contact kinematics of locators and part surfaces, and the geometric constraints equation defined by the locating scheme, an improved analytical variation propagation model for MMP is presented. In which the influence of both locator position and machining error on part quality is considered while, in traditional model, it usually focuses on datum error and fixture error. Coordinate transformation theory is used to reflect the generation and transmission laws of error in the establishment of the model. The concept of deviation matrix is heavily applied to establish an explicit mapping between the geometric deviation of part and the process error sources. In each machining stage, the part deviation is formulized as three separated components corresponding to three different kinds of error sources, which can be further applied to fault identification and design optimization for complicated machining process. An example part for MMP is given out to validate the effectiveness of the methodology. The experiment results show that the model prediction and the actual measurement match well. This paper provides a method to predict part deviation under the influence of fixture error, datum error and machining error, and it enriches the way of quality prediction for MMP. 展开更多
关键词 quality prediction variation reduction geometric constraint equation deviation matrix multistage machining process
下载PDF
Utilization of plant-based natural coagulants as future alternatives towards sustainable water clarification 被引量:2
2
作者 Sook Yan Choy Krishna Murthy Nagendra Prasad +2 位作者 Ta Yeong Wu Mavinakere Eshwaraiah Raghunandan Ramakrishnan Nagasundara Ramanan 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2014年第11期2178-2189,共12页
Rapid industrial developments coupled with surging population growth have complicated issues dealing with water scarcity as the quest for clean and sanitized water intensifies globally. Existing flesh water supplies c... Rapid industrial developments coupled with surging population growth have complicated issues dealing with water scarcity as the quest for clean and sanitized water intensifies globally. Existing flesh water supplies could be contaminated with organic, inorganic and biological matters that have potential harm to the society. Turbidity in general is a measure of water cloudiness induced by such colloidal and suspended matters and is also one of the major criteria in raw water monitoring to meet the stipulated water quality guidelines. Turbidity reduction is often accomplished using chemical coagulants such as alum. The use of alum is widely associated with potential development of health issues and generation of voluminous sludge. Natural coagulants that are available in abundance can certainly be considered in addressing the drawbacks associated with the use of chemical coagulants. Twenty one types of plant-based natural coagulants categorized as fruit waste and others are identified and presented collectively with their research summary in this review. The barriers and prospects of commercialization of natural coagulants in near future are also discussed. 展开更多
关键词 Chemical coagulant Commercialization constraints Fruit waste Protein Turbidity reduction
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部