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This study aims to present a model and analysis of automotive body outer cover panels (OCPs) assembly systems to predict assembly variation. In the automotive industry…
This study aims to present a model and analysis of automotive body outer cover panels (OCPs) assembly systems to predict assembly variation. In the automotive industry, the OCPs assembly process directly influences the quality of the automobile body appearance. However, suitable models to describe variation propagation of OCPs assembly systems remain unknown.
An adaptive state space model for OCPs assembly systems is introduced to accurately express variation propagation, including variation accumulation and transition, where two compliant deviations make impacts on key product characteristics (KPCs) of OCP, and the impacts are accumulated from welding process to threaded connection process. Another new source of variation from threaded connection is included in this model. To quantify the influence of variation from threaded connection on variation propagation, the threaded connection sensitivity matrix is introduced to build up a linear relationship between deviation from threaded connection and output deviation in KPCs. This matrix is solved by homogeneous coordinate transformation. The final deviation of KPCs will be transferred to ensure gaps and flushes between two OCPs, and the transition matrix is considered as a unit matrix to build up the transition relationship between different states.
A practical case on the left side body structure is described, where simulation result of variation propagation reveals the basic rule of variation propagation and the significant effect of variation from threaded connection on variation propagation of OCPs assembly system.
The model can be used to predict assembly variation or potential dimension problems at a preliminary assembly phase. The calculated results of assembly variation guide designers or technicians on tolerance allocation, fixture layout design and process planning.
The ability to sift through the ever‐increasing amounts of information made available online to find quality and accurate data is becoming more important every day. Using…
The ability to sift through the ever‐increasing amounts of information made available online to find quality and accurate data is becoming more important every day. Using credibility, accuracy, reasonableness, support, and uniqueness as criteria for Web site evaluation, the authors analyse five Web sites in an effort to determine the value and quality of the information. This article discusses the evaluation of Web sites dedicated to Chinese archaeology, and also points to six main characters of online resources for the subject area. In addition, questions are raised concerning the extent to which online Chinese archaeological resources can advance general awareness of the field and contribute to a growing body of knowledge. The authors hope this article sheds light on some of the challenges that need to be overcome when attempting to present this information to the global community.
This paper discusses some aspects of the performing arts of the Tibetans and attempts to analyze how they have fared within the context of an extremely large and…
This paper discusses some aspects of the performing arts of the Tibetans and attempts to analyze how they have fared within the context of an extremely large and modernizing state, where since the late 1970s modernization has been accompanied by a contrary revival of traditions. It argues that performing arts traditions remain powerful among the Tibetans and takes issue with the frequently heard notion that Tibetan culture is being destroyed. It contends, however, that the acceleration of modernization in the coming decades could weaken the tradition in Tibetan culture by affecting its link with the society which feeds it. But what is likely to develop is a changed Tibetan culture, with more place given to those features we know as modernity. On the other hand, the traditions are most unlikely to die out in the foreseeable future. The topical focus of the article is on the performing arts, especially the related forms of drama, balladry and dance. The period of focus is that since the early 1980s, and especially the 1990s.
In order to solve the current imbalance of academic resources within the discipline, this article builds a three-dimensional talent evaluation model based on the…
In order to solve the current imbalance of academic resources within the discipline, this article builds a three-dimensional talent evaluation model based on the topic–author–citation based on the z index and proposes the ZAS index to evaluate scholars on different research topics within the discipline.
Based on the sample data of the CSSCI journals in the discipline of physical education in the past five years, the keywords were classified into 13 categories of research topics including female sports. The ZAS index of scholars on topic of female sports and so on was calculated, and quantitative indexes such as h index p index and z index were calculated. Comparative analysis of the evaluation effect was performed.
It is found that compared with the h index and p index, the z index achieves a better balance between the quantity, quality and citation distribution of scholars' results and effectively recognizes that the citation quality is higher and the number of citations of each paper is more balanced. In addition, compared to the z index, this article is based on a ZAS index model with an improved three-dimensional topic–author–citation relationship in research fields such as female sports.
It can identify some outstanding scholars who are engaged in small-scale or emerging topic research such as female sports and are excellent in different research areas. Talents create an objective and fair evaluation environment. At the same time, the ranking ability of ZAS indicators in the evaluation of talents is the strongest, and it is expected to be used in practical evaluations.