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Reliability Based Design Optimization Of An Automotive Body Structure Under Crashworthiness Constraints
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Book Synopsis Reliability-based Design Optimization of an Automotive Body Structure Under Crashworthiness Constraints by : Maliki Moustapha
Download or read book Reliability-based Design Optimization of an Automotive Body Structure Under Crashworthiness Constraints written by Maliki Moustapha and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Adaptive Kriging Reliability-based Design Optimization of an Automotive Body Structure Under Crashworthiness Constraints by : Maliki Moustapha
Download or read book Adaptive Kriging Reliability-based Design Optimization of an Automotive Body Structure Under Crashworthiness Constraints written by Maliki Moustapha and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Structural Crashworthiness by : Norman Jones
Download or read book Structural Crashworthiness written by Norman Jones and published by Butterworth-Heinemann. This book was released on 1983 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Reliability-Based Optimization für Multiple Constraints with Evolutionary Algorithms by : David Daum
Download or read book Reliability-Based Optimization für Multiple Constraints with Evolutionary Algorithms written by David Daum and published by diplom.de. This book was released on 2014-04-11 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt: Inhaltsangabe:Introduction: In handling real-world optimization problems, it is often the case that the underlying decision variables and parameters cannot be controlled exactly as specified. For example, if a deterministic consideration of an optimization problem results in an optimal dimension of a cylindrical member to have a 50 mm diameter, there exists no manufacturing process which will guarantee the production of a cylinder having exactly a 50 mm diameter. Every manufacturing process has a finite machine precision and the dimensions are expected to vary around the specified value. Similarly, the strength of a material often does not remain fixed for the entire length of the material and is expected to vary from point to point. When such variations in decision variables and parameters are expected in practice, an obvious question arises: How reliable is the optimized design against failure when the suggested parameters cannot be adhered to? This question is important because in most optimization problems the deterministic optimum lies at the intersection of a number of constraint boundaries. Thus, if no uncertainties in parameters and variables are expected, the optimized solution is the best choice, but if uncertainties are expected, in most occasions, the optimized solution will be found to be infeasible, violating one or more constraints. These uncertainties, which are either controllable (e.g.imensions) or uncontrollable (e.g. material properties), are present and need to be accounted for in the design process. Assuming that the variables follow a probability distribution in practice, reliability-based design optimization (RBDO) methods find a reliable solution which is feasible with a pre-specified probability. In most RBDO problems, failure probability and costs are violating objectives, which means that when one is lowered, the other may rise. Therefore, it is important to identify the uncertain variables which have an impact on the problem and describe them with different probability distributions based on statistical calculations. Then, the ordinary deterministic constraint is replaced by a stochastic constraint which is only restricting the probability of failure for a solution, not the failure itself. This can be done for each constraint or for the complete set of constraints, for the complete structure. Different methods for evaluating the reliability of a solution exist. If the cumulative density function (CDF) with its [...]
Book Synopsis Design Optimization of Vehicle Structures for Crashworthiness Improvement by : Hesham Kamel Ibrahim
Download or read book Design Optimization of Vehicle Structures for Crashworthiness Improvement written by Hesham Kamel Ibrahim and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The complicated nature of the physical crash processes of complex vehicle structures makes design optimization for crashworthiness a very challenging task. Moreover, large scale and highly nonlinear nature of crashworthiness simulations of vehicle structure make it impractical to conduct direct optimization on the full nonlinear model of the structure. The main objective of the thesis is to present a systematic and practical methodology to conduct vehicle crashworthiness design optimization efficiently at early stages of design. The thesis includes four main parts. In the first part, an efficient and practical methodology for design optimization of vehicle structures under frontal impact for crashworthiness improvement is presented. The proposed methodology is based on identifying the main vehicle structural part contributing most to the total amount of impact energy absorbed in the whole vehicle structure. The computationally efficient surrogate model of expensive nonlinear finite element simulation of this major vehicle part is developed and then integrated with gradient based optimization algorithm to maximize its absorbed impact energy while guarding against increase in its weight. In the second part, a methodology for deriving the important relation between minimum structural weight and maximum impact energy is presented. The proposed methodology is based on the principle of the Pareto front and multiobjective optimization. The methodology enables the designer to evaluate the crashworthiness performance of any suggested design easily and effectively. Moreover, the methodology provides different optimum designs from which the designer can easily select the optimum design variables to improve the performance of the initial design. In the third part, the crashworthiness behavior of simple thin walled structures and vehicle structural components made of magnesium due to its light weight is examined and a new methodology for material design optimization is presented. The proposed methodology adds material type as design variables to formal size design variables. Direct optimization using the genetic algorithm is conducted to find the optimum material combination and part's thicknesses to improve the crashworthiness performance of the vehicle structure. Finally in the fourth part, the effect of imperfection on crush elements performance is studied. Different imperfection configurations are proposed to improve the crashworthiness performance of crush elements. The genetic algorithm is directly combined with nonlinear finite elements models to search for optimum imperfection values. The results show that the crashworthiness performance of crush elements can be greatly improved through introduction of proper imperfection. Using the proposed methodologies, the current research presents a fundamental and systematic study to conduct design optimization of vehicle structures practically and efficiently.
Book Synopsis Nonlinear Optimization of Vehicle Safety Structures by : Jesper Christensen
Download or read book Nonlinear Optimization of Vehicle Safety Structures written by Jesper Christensen and published by Butterworth-Heinemann. This book was released on 2015-12-07 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nonlinear Optimization of Vehicle Safety Structures: Modeling of Structures Subjected to Large Deformations provides a cutting-edge overview of the latest optimization methods for vehicle structural design. The book focuses on large deformation structural optimization algorithms and applications, covering the basic principles of modern day topology optimization and comparing the benefits and flaws of different algorithms in use. The complications of non-linear optimization are highlighted, along with the shortcomings of recently proposed algorithms. Using industry relevant case studies, users will how optimization software can be used to address challenging vehicle safety structure problems and how to explore the limitations of the approaches given. The authors draw on research work with the likes of MIRA, Jaguar Land Rover and Tata Motors European Technology Centre as part of multi-million pound European funded research projects, emphasizing the industry applications of recent advances. The book is intended for crash engineers, restraints system engineers and vehicle dynamics engineers, as well as other mechanical, automotive and aerospace engineers, researchers and students with a structural focus. Focuses on non-linear, large deformation structural optimization problems relating to vehicle safety Discusses the limitations of different algorithms in use and offers guidance on best practice approaches through the use of relevant case studies Author's present research from the cutting-edge of the industry, including research from leading European automotive companies and organizations Uses industry relevant case studies, allowing users to understand how optimization software can be used to address challenging vehicle safety structure problems and how to explore the limitations of the approaches given
Book Synopsis Reliability and Robust Design in Automotive Engineering by :
Download or read book Reliability and Robust Design in Automotive Engineering written by and published by . This book was released on 2004 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Proceedings of the ... ASME Design Engineering Technical Conferences by :
Download or read book Proceedings of the ... ASME Design Engineering Technical Conferences written by and published by . This book was released on 2002 with total page 1188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Modeling, Simulation and Optimization Approaches for Design of Lightweight Car Body Structures by : Morteza Kiani
Download or read book Modeling, Simulation and Optimization Approaches for Design of Lightweight Car Body Structures written by Morteza Kiani and published by . This book was released on 2013 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt: Simulation-based design optimization and finite element method are used in this research to investigate weight reduction of car body structures made of metallic and composite materials under different design criteria. Besides crashworthiness in full frontal, offset frontal, and side impact scenarios, vibration frequencies, static stiffness, and joint rigidity are also considered. Energy absorption at the component level is used to study the effectiveness of carbon fiber reinforced polymer (CFRP) composite material with consideration of different failure criteria. A global-local design strategy is introduced and applied to multi-objective optimization of car body structures with CFRP components. Multiple example problems involving the analysis of full-vehicle crash and body-in-white models are used to examine the effect of material substitution and the choice of design criteria on weight reduction. The results of this study show that car body structures that are optimized for crashworthiness alone may not meet the vibration criterion. Moreover, optimized car body structures with CFRP components can be lighter with superior crashworthiness than the baseline and optimized metallic structures.
Book Synopsis Fundamentals of Automobile Body Structure Design, 2nd Edition by : Donald E. Malen
Download or read book Fundamentals of Automobile Body Structure Design, 2nd Edition written by Donald E. Malen and published by SAE International. This book was released on 2020-08-04 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides readers with a solid understanding of the principles of automobile body structural design, illustrating the effect of changing design parameters on the behavior of automobile body structural elements. Emphasizing simple models of the behavior of body structural systems rather than complex mathematical models, the book looks at the best way to shape a structural element to achieve a desired function, why structures behave in certain ways, and how to improve performance. This second edition of Fundamentals of Automobile Body Structure Design contains many new sections including: the treatment of crashworthiness conditions of static roof crush and the small overlap rigid barrier torsion stiffness requirements material selection illustrations of body architecture Each chapter now includes a clear flow down of requirements following the systems engineering methodology. Illustrations have been updated and expanded and a fresh modern format has been adapted enhancing the readability of the book.
Book Synopsis Road and Off-Road Vehicle System Dynamics Handbook by : Gianpiero Mastinu
Download or read book Road and Off-Road Vehicle System Dynamics Handbook written by Gianpiero Mastinu and published by CRC Press. This book was released on 2014-01-06 with total page 1710 pages. Available in PDF, EPUB and Kindle. Book excerpt: Featuring contributions from leading experts, the Road and Off-Road Vehicle System Dynamics Handbook provides comprehensive, authoritative coverage of all the major issues involved in road vehicle dynamic behavior. While the focus is on automobiles, this book also highlights motorcycles, heavy commercial vehicles, and off-road vehicles. The authors of the individual chapters, both from automotive industry and universities, address basic issues, but also include references to significant papers for further reading. Thus the handbook is devoted both to the beginner, wishing to acquire basic knowledge on a specific topic, and to the experienced engineer or scientist, wishing to have up-to-date information on a particular subject. It can also be used as a textbook for master courses at universities. The handbook begins with a short history of road and off-road vehicle dynamics followed by detailed, state-of-the-art chapters on modeling, analysis and optimization in vehicle system dynamics, vehicle concepts and aerodynamics, pneumatic tires and contact wheel-road/off-road, modeling vehicle subsystems, vehicle dynamics and active safety, man-vehicle interaction, intelligent vehicle systems, and road accident reconstruction and passive safety. Provides extensive coverage of modeling, simulation, and analysis techniques Surveys all vehicle subsystems from a vehicle dynamics point of view Focuses on pneumatic tires and contact wheel-road/off-road Discusses intelligent vehicle systems technologies and active safety Considers safety factors and accident reconstruction procedures Includes chapters written by leading experts from all over the world This text provides an applicable source of information for all people interested in a deeper understanding of road vehicle dynamics and related problems.
Book Synopsis Crashworthiness of Transportation Systems: Structural Impact and Occupant Protection by : Jorge A.C. Ambrósio
Download or read book Crashworthiness of Transportation Systems: Structural Impact and Occupant Protection written by Jorge A.C. Ambrósio and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt: A systematic treatment of current crashworthiness practice in the automotive, railroad and aircraft industries. Structural, exterior and interior design, occupant biomechanics, seat and restraint systems are dealt with, taking account of statistical data, current regulations and state-of-the-art design tool capabilities. Occupant kinematics and biomechanics are reviewed, leading to a basic understanding of human tolerance to impact and of the use of anthropometric test dummies and mathematical modelling techniques. Different types of restraining systems are described in terms of impact biomechanics. The material and structural behaviour of vehicle components is discussed in relation to crash testing. A variety of commonly used techniques for simulating occupants and structures are presented, in particular the use of multibody dynamics, finite element methods and simplified macro-elements, in the context of design tools of increasing complexity, which can be used to model both vehicles and occupants. Audience: An excellent reference for researchers, engineers, students and all other professionals involved in crashworthiness work.
Author :Jorge A.C. Ambrosio Publisher :Springer Science & Business Media ISBN 13 :9783211833346 Total Pages :484 pages Book Rating :4.8/5 (333 download)
Book Synopsis Crashworthiness by : Jorge A.C. Ambrosio
Download or read book Crashworthiness written by Jorge A.C. Ambrosio and published by Springer Science & Business Media. This book was released on 2001-06-19 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt: From the fundamentals of impact mechanics and biomechanics to modern analysis and design techniques in impact energy management and occupant protection this book provides an overview of the application of nonlinear finite elements, conceptual modeling and multibody procedures, impact biomechanics, injury mechanisms, occupant mathematical modeling, and human surrogates in crashworthiness.
Book Synopsis Structural Design and Crashworthiness of Automobiles by : T. K. S. Murthy
Download or read book Structural Design and Crashworthiness of Automobiles written by T. K. S. Murthy and published by . This book was released on 1987 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Structural Optimization of Thin Walled Tubular Structure for Crashworthiness by : Satyajeet Suresh Shinde
Download or read book Structural Optimization of Thin Walled Tubular Structure for Crashworthiness written by Satyajeet Suresh Shinde and published by . This book was released on 2014 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: Crashworthiness design is gaining more importance in the automotive industry due to high competition and tight safety norms. Further there is a need for light weight structures in the automotive design. Structural optimization in last two decades have been widely explored to improve existing designs or conceive new designs with better crashworthiness and reduced mass. Although many gradient based and heuristic methods for topology and topometry based crashworthiness design are available these days, most of them result in stiff structures that are suitable only for a set of vehicle components in which maximizing the energy absorption or minimizing the intrusion is the main concern. However, there are some other components in a vehicle structure that should have characteristics of both stiffness and flexibility. Moreover, the load paths within the structure and potential buckle modes also play an important role in efficient functioning of such components. For example, the front bumper, side frame rails, steering column, and occupant protection devices like the knee bolster should all exhibit controlled deformation and collapse behavior. This investigation introduces a methodology to design dynamically crushed thin-walled tubular structures for crashworthiness applications. Due to their low cost, high energy absorption efficiency, and capacity to withstand long strokes, thin-walled tubular structures are extensively used in the automotive industry. Tubular structures subjected to impact loading may undergo three modes of deformation: progressive crushing/buckling, dynamic plastic buckling, and global bending or Euler-type buckling. Of these, progressive buckling is the most desirable mode of collapse because it leads to a desirable deformation characteristic, low peak reaction force, and higher energy absorption efficiency. Progressive buckling is generally observed under pure axial loading; however, during an actual crash event, tubular structures are often subjected to oblique impact loads in which Euler-type buckling is the dominating mode of deformation. This undesired behavior severely reduces the energy absorption capability of the tubular structure. The design methodology presented in this paper relies on the ability of a compliant mechanism to transfer displacement and/or force from an input to desired output port locations. The suitable output port locations are utilized to enforce desired buckle zones, mitigating the natural Euler-type buckling effect. The problem addressed in this investigation is to find the thickness distribution of a thin-walled structure and the output port locations that maximizes the energy absorption while maintaining the peak reaction force at a prescribed limit. The underlying design for thickness distribution follows a uniform mutual potential energy density under a dynamic impact event. Nonlinear explicit finite element code LS-DYNA is used to simulate tubular structures under crash loading. Biologically inspired hybrid cellular automaton (HCA) method is used to drive the design process. Results are demonstrated on long straight and S-rail tubes subject to oblique loading, achieving progressive crushing in most cases.
Book Synopsis Structural Optimization in Vehicle Crashworthiness Design by : Jimmy Forsberg
Download or read book Structural Optimization in Vehicle Crashworthiness Design written by Jimmy Forsberg and published by . This book was released on 2005 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Design Optimization of Vehicle Structures for Crashworthiness Using Equivalent Mechanism Approximations by : K. Hamza
Download or read book Design Optimization of Vehicle Structures for Crashworthiness Using Equivalent Mechanism Approximations written by K. Hamza and published by . This book was released on 2005 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new method for crashworthiness optimization of vehicle structures is presented, where an early design exploration is done by the optimization of an "equivalent" mechanism approximating a vehicle structure. An equivalent mechanism is a network of rigid links with lumped mass connected by prismatic and revolute joints with nonlinear springs approximating aggregated behaviors of structural members. A number of finite element (FE) models of the thin-walled beams with typical cross sections and wall thicknesses are analyzed to build a surrogate model that maps a property of nonlinear spring to the corresponding FE model. Using the surrogate model, an equivalent mechanism is optimized for given design objectives by selecting the properties of the nonlinear springs among the values that can be realized by an FE model. After the optimization, the component FE models corresponding to the optimal spring properties are "assembled" into a FE model of an entire structure, which is further modified for final tuning. Two case studies of a vehicle front substructure are presented, which demonstrate the approach can help obtain a better design with far less computational resources than the direct optimization of a FE model.
