Variation Simulation for Compliant Sheet Metal Assemblies with Applications PDF Download
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Author: Yufeng Long
Publisher:
ISBN:
Category :
Languages : en
Pages : 332
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Book Description
Author: Yufeng Long
Publisher:
ISBN:
Category :
Languages : en
Pages : 332
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Book Description
Author: Adam Nagy-Sochacki
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Imperfections are inherent in every manufactured part - when the hundreds of sheet metal components that form the automotive Body In White (BIW) are assembled together, significant deformation and variability are possible. Although early work by Takazawa (1980) showed that compliant components can absorb individual component variability when assembled, interactions between the components and successive operations complicates analysis of the assembly process and prediction of the assembled output. Therefore, improving vehicle dimensional quality requires more detailed knowledge of the assembly process and control of features critical to functionality and aesthetic appeal. In the automotive industry, these features include: uneven gaps and flushness between panels, high closure forces, and incorrect seal gaps leading to leaks and excessive noise. Despite significant research in the field of compliant assembly, there have not been sufficiently detailed studies regarding the joining sequence process. Further, existing works are based on a number of assumptions that limits the applicability of their results. This thesis addresses this gap by utilising the joining process sequence to control deformations and minimise dimensional variation during the assembly of complex non-ideal compliant components. In this work, a geometry class to represent complex compliant assemblies is presented; the interactions of process sequences and variations examined; the criteria for robust sequence selection established; and a method for the rapid identification of robust sequences is developed. In addressing the aim of this research a number of key findings were developed. A broad method of classifying the input variation of the components is presented. Using this basis, identifying when the joining process has a significant influence on final assembly dimensionality can be established. The pre-existing guidelines of fixed-to-free end were then further generalised for complex geometries, resulting in the approach of most-to-least rigid configuration, noting the importance of prior joining operations and the fixture boundary conditions. In determining the potential impact of the joining sequence, the need to consider the build-up of internal stresses while modelling the assembly process is highlighted. A novel method, which analyses the natural frequency shift of the structure between successive joins, is presented as a technique of calculating a robust joining sequence. This technique requires no knowledge of the part deformations, only the component geometry, fixture configuration and weld locations, and hence is more practical to industry. Experimental studies to validate the simulation-based work were then performed. Although sequence-based trends are identifiable in some of the extracted data patterns, the twist induced in the experimental structure was less significant when compared to the simulated results. This difference is a result of a number of factors which are then postulated and analysed. Further investigation of this effect would be beneficial to further validate the approach. To build on the work in this thesis, two notable directions in addition to further industrial validation have been identified. By assessing the functional impact of variation patterns in measurement data, functional variation sequence synthesis could be investigated; where the goal is to select a sequence that best controls these critical functional variations. Evolvable assembly systems that utilise the input work and holding forces to optimise the sequence operations and minimise potential spring-back of the component can also be considered. This strategy would negate the need for the additional measurement step for process feedback which currently hampers existing adaptive techniques. With between four and six thousand joins performed per vehicle, an estimated 300 billion joining operations are performed annually worldwide. With minimal knowledge available to industry regarding the impact of the joining process sequence, the results from this work have the potential to significantly improve quality in the automotive market.
Author: Shenhou Liu
Publisher:
ISBN:
Category :
Languages : en
Pages : 324
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Author: Stefan Dahlström
Publisher:
ISBN: 9789172916425
Category :
Languages : en
Pages : 66
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Author: Hoda A. ElMaraghy
Publisher: Springer Science & Business Media
ISBN: 1461557976
Category : Science
Languages : en
Pages : 468
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Book Description
The importance of proper geometric dimensioning and tolerancing as a means of expressing the designer's functional intent and controlling the inevitable geometric and dimensional variations of mechanical parts and assemblies, is becoming well recognized. The research efforts and innovations in the field of tolerancing design, the development of supporting tools, techniques and algorithms, and the significant advances in computing software and hardware all have contributed to its recognition as a viable area of serious scholarly contributions. The field of tolerancing design is successfully making the transition to maturity where deeper insights and sound theories are being developed to offer explanations, and reliable implementations are introduced to provide solutions. Machine designers realized very early that manufacturing processes do not produce the nominal dimensions of designed parts. The notion of associating a lower and an upper limit, referred to as tolerances, with each dimen sion was introduced. Tolerances were specified to ensure the proper function of mating features. Fits of mating features included clearances, location fits, and interference fits, with various sub-grades in each category assigned a tolerance value depending on the nominal size of the mating features. During the inspection process, a part is rejected if a dimension fell outside the specified range. As the accuracy requirements in assemblies became tighter, designers had to consider other critical dimensions and allocate tolerances to them in order to ensure the assembly's functionality.
Author: Jianjun Shi
Publisher: CRC Press
ISBN: 1420003909
Category : Business & Economics
Languages : en
Pages : 492
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Book Description
Variability arises in multistage manufacturing processes (MMPs) from a variety of sources. Variation reduction demands data fusion from product/process design, manufacturing process data, and quality measurement. Statistical process control (SPC), with a focus on quality data alone, only tells half of the story and is a passive method, taking corre
Author: Jaime A. Camelio
Publisher:
ISBN:
Category :
Languages : en
Pages : 248
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Book Description
Author: Jong Wan Hu
Publisher: CRC Press
ISBN: 1317404939
Category : Technology & Engineering
Languages : en
Pages : 996
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Book Description
The ICAMEST 2015 Conference covered new developments in advanced materials and engineering structural technology. Applications in civil, mechanical, industrial and material science are covered in this book. Providing high-quality, scholarly research, addressing developments, applications and implications in the field of structural health monitoring, construction safety and management, sensors and measurements. This volume contains new models for nonlinear structural analysis and applications of modeling identification. Furthermore, advanced chemical materials are discussed with applications in mechanical and civil engineering and for the maintenance of new materials. In addition, a new system of pressure regulating and water conveyance based on small and middle hydropower stations is discussed. An experimental investigation of the ultimate strength and behavior of the three types of steel tubular K-joints was presented. Furthermore, real-time and frequency linear and nonlinear modeling performance of materials of structures contents were concluded with the notion of a fully brittle material, and this approach is implemented in the book by outlining a finite-element method for the prediction of the construction performance and cracking patterns of arbitrary structural concrete forms. This book is an ideal reference for practicing engineers in material, mechanical and civil engineering and consultants (design, construction, maintenance), and can also be used as a reference for students in mechanical and civil engineering courses.
Author: Haixia Wang
Publisher:
ISBN:
Category :
Languages : en
Pages : 200
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Author: Razvan Udroiu
Publisher: BoD – Books on Demand
ISBN: 953512787X
Category : Computers
Languages : en
Pages : 171
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Book Description
The aim of this book is to present the latest applications, trends, and developments of computer-aided technologies (CAx). Computer-aided technologies are the core of product lifecycle management (PLM) and human lifecycle management (HUM). This book has seven chapters, organized in two sections: "Computer-Aided Technologies in Engineering" and "Computer-Aided Technologies in Medicine." The first section treats the different aspects of PLM, including design, simulations and analysis, manufacturing, production planning, and quality assurance. In the second part of the book are presented CAx applications in medicine focused on clinical decision, diagnosis, and biosensor design. CAx plays a key role in a variety of engineering and medical applications, bringing a lot of benefits in product life cycle, extending and improving human life.
