The Experts below are selected from a list of 72 Experts worldwide ranked by ideXlab platform
Wanhee Jeong - One of the best experts on this subject based on the ideXlab platform.
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subsystem synthesis method with approximate function approach for a real time multibody vehicle model
Multibody System Dynamics, 2007Co-Authors: Wanhee JeongAbstract:This paper presents the subsystem synthesis method with approximate function approach for a real-time multibody vehicle dynamics model. In the subsystem synthesis method, equations of motion for the car body of a vehicle and the equations of motion for Suspension subsystems are formed separately for efficient computation. Joint coordinates are used to construct Suspension subsystem equations of motion. Since these joint coordinates must satisfy the loop closure constraint equations that represent Suspension Linkage kinematics, they are not all independent. Using the generalized coordinate partitioning method, Suspension subsystem equations of motion can be represented only in terms of independent generalized coordinates. To represent dependent coordinates as a function of independent coordinates in the generalized coordinate partitioning method, expensive numerical approaches, such as the Newton–Raphson method, must be applied. For real-time computation of the multibody vehicle model, an approximate function approach is proposed to express the dependent coordinates as polynomial functions of the independent coordinates within the framework of the subsystem synthesis method. Different orders of candidate polynomial functions are investigated for solution accuracy. Efficiency of the proposed method has been studied theoretically by counting arithmetic operators. By measuring actual CPU times of the simulations with a quarter car and a full car model, efficiency of the proposed method has also been investigated.
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Compliance Effect Consideration for Real-Time Multibody Vehicle Dynamics Using Quasi-Static Analysis
Volume 5: 6th International Conference on Multibody Systems Nonlinear Dynamics and Control Parts A B and C, 2007Co-Authors: Sung-soo Kim, Wanhee Jeong, Seong-hoon KimAbstract:HILS (Hardware-in-the Loop Simulation) vehicle simulator is one of the most effective tools to develop control subsystems for the intelligent vehicles, since expensive vehicle field tests can be replaced with virtual tests in the HILS simulator. In the HILS simulator, the software vehicle dynamics model must be solved in real-time, and it must also reproduce the real vehicle motions. Compliance effects from Suspension bush elements significantly influences the vehicle behavior. In order to include such compliance effects to the vehicle model, normally the spring-damper model of the bush elements is used. However, high stiffness of the bush elements hinders real-time simulations. Thus, it is necessary to have an efficient method to include compliance effects for the real-time multibody vehicle dynamics model. In this paper, compliance model for real-time multibody vehicle dynamics is proposed using quasi-static analysis. The multibody vehicle model without bush elements is used based on the subsystem synthesis method which provides real-time computation on the multibody vehicle model. Reaction forces are computed in the Suspension subsystem. According to deformation from the quasi-static analysis using reaction forces and bush stiffness, Suspension hardpoint locations and Suspension Linkage orientation are changed. To validate the proposed method, quarter car simulations and full car bump run simulations are carried out comparing with the ADAMS vehicle model with bush elements. CPU times are also measured to see the real-time capabilities of the proposed method.Copyright © 2007 by ASME
Horst E. Friedrich - One of the best experts on this subject based on the ideXlab platform.
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Topological optimization of a Suspension concept considering the kinematics and compliance performance and the geometric non-linearity:
Proceedings of the Institution of Mechanical Engineers Part D: Journal of Automobile Engineering, 2017Co-Authors: Meng Wang, Elmar Beeh, David Krüger, Horst E. FriedrichAbstract:This paper proposes a structure design approach for a Suspension concept based on topological optimization. In this approach, the kinematics and compliance requirements and the geometric non-linearity are introduced into the structural optimization in order to generate a new lightweight Suspension structure and to simplify the iterative design steps between the mechanical requirements and the kinematics and compliance requirements. In the Suspension concept, the electric motors are integrated into the longitudinal arms. This concept needs a new Suspension Linkage with a lightweight structure. For the cases with Suspension compliance, linear implicit optimization is used in the design; for the cases with Suspension kinematics, the equivalent static load method for implicit optimization with a geometric non-linearity is employed to seek the optimum. By this approach, a Suspension structure is obtained. This structure has a better kinematics and compliance performance with a reduced mass than the reference s...
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Topological Optimization of a Suspension Concept Considering K&C Performance and Geometric Nonlinearity
2017Co-Authors: Meng Wang, Elmar Beeh, David Krüger, Horst E. FriedrichAbstract:This paper proposes a structure design approach for a Suspension concept based on topological optimization. In this approach, the kinematics and compliance requirements and the geometric non-linearity are introduced into the structural optimization in order to generate a new lightweight Suspension structure and to simplify the iterative design steps between the mechanical requirements and the kinematics and compliance requirements. In the Suspension concept, the electric motors are integrated into the longitudinal arms. This concept needs a new Suspension Linkage with a lightweight structure. For the cases with Suspension compliance, linear implicit optimization is used in the design; for the cases with Suspension kinematics, the equivalent static load method for implicit optimization with a geometric non-linearity is employed to seek the optimum. By this approach, a Suspension structure is obtained. This structure has a better kinematics and compliance performance with a reduced mass than the reference Suspension does.
Seong-hoon Kim - One of the best experts on this subject based on the ideXlab platform.
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Compliance Effect Consideration for Real-Time Multibody Vehicle Dynamics Using Quasi-Static Analysis
Volume 5: 6th International Conference on Multibody Systems Nonlinear Dynamics and Control Parts A B and C, 2007Co-Authors: Sung-soo Kim, Wanhee Jeong, Seong-hoon KimAbstract:HILS (Hardware-in-the Loop Simulation) vehicle simulator is one of the most effective tools to develop control subsystems for the intelligent vehicles, since expensive vehicle field tests can be replaced with virtual tests in the HILS simulator. In the HILS simulator, the software vehicle dynamics model must be solved in real-time, and it must also reproduce the real vehicle motions. Compliance effects from Suspension bush elements significantly influences the vehicle behavior. In order to include such compliance effects to the vehicle model, normally the spring-damper model of the bush elements is used. However, high stiffness of the bush elements hinders real-time simulations. Thus, it is necessary to have an efficient method to include compliance effects for the real-time multibody vehicle dynamics model. In this paper, compliance model for real-time multibody vehicle dynamics is proposed using quasi-static analysis. The multibody vehicle model without bush elements is used based on the subsystem synthesis method which provides real-time computation on the multibody vehicle model. Reaction forces are computed in the Suspension subsystem. According to deformation from the quasi-static analysis using reaction forces and bush stiffness, Suspension hardpoint locations and Suspension Linkage orientation are changed. To validate the proposed method, quarter car simulations and full car bump run simulations are carried out comparing with the ADAMS vehicle model with bush elements. CPU times are also measured to see the real-time capabilities of the proposed method.Copyright © 2007 by ASME
Meng Wang - One of the best experts on this subject based on the ideXlab platform.
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Topological optimization of a Suspension concept considering the kinematics and compliance performance and the geometric non-linearity:
Proceedings of the Institution of Mechanical Engineers Part D: Journal of Automobile Engineering, 2017Co-Authors: Meng Wang, Elmar Beeh, David Krüger, Horst E. FriedrichAbstract:This paper proposes a structure design approach for a Suspension concept based on topological optimization. In this approach, the kinematics and compliance requirements and the geometric non-linearity are introduced into the structural optimization in order to generate a new lightweight Suspension structure and to simplify the iterative design steps between the mechanical requirements and the kinematics and compliance requirements. In the Suspension concept, the electric motors are integrated into the longitudinal arms. This concept needs a new Suspension Linkage with a lightweight structure. For the cases with Suspension compliance, linear implicit optimization is used in the design; for the cases with Suspension kinematics, the equivalent static load method for implicit optimization with a geometric non-linearity is employed to seek the optimum. By this approach, a Suspension structure is obtained. This structure has a better kinematics and compliance performance with a reduced mass than the reference s...
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Topological Optimization of a Suspension Concept Considering K&C Performance and Geometric Nonlinearity
2017Co-Authors: Meng Wang, Elmar Beeh, David Krüger, Horst E. FriedrichAbstract:This paper proposes a structure design approach for a Suspension concept based on topological optimization. In this approach, the kinematics and compliance requirements and the geometric non-linearity are introduced into the structural optimization in order to generate a new lightweight Suspension structure and to simplify the iterative design steps between the mechanical requirements and the kinematics and compliance requirements. In the Suspension concept, the electric motors are integrated into the longitudinal arms. This concept needs a new Suspension Linkage with a lightweight structure. For the cases with Suspension compliance, linear implicit optimization is used in the design; for the cases with Suspension kinematics, the equivalent static load method for implicit optimization with a geometric non-linearity is employed to seek the optimum. By this approach, a Suspension structure is obtained. This structure has a better kinematics and compliance performance with a reduced mass than the reference Suspension does.
Ion Preda - One of the best experts on this subject based on the ideXlab platform.
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Independent Suspension—The Equivalence of Model and Vehicle Parameters
Proceedings of the European Automotive Congress EAEC-ESFA 2015, 2015Co-Authors: Ion PredaAbstract:The vehicle Suspension design starts with studies on simple models, needing few input data. The aim of the initial model simulations is to choose the Suspension parameters able to ensure the a good compromise between comfort and dynamic vehicle qualities, at different travelling speeds and loads. The result of this stage is the setup on the model of the needed Suspension parameters, from which the stiffness of the Suspension springs and tires and the damping coefficient are the most important. After starting the design with initial layouts and dimensions of the Suspension Linkage, the model parameters must be “translated” to the real vehicle. This paper primarily deals with the Suspension model—real vehicle Suspension translation process. For the MacPherson, short-long arm and swing arm Suspensions, it is emphasizing the equivalence between a displacement or a force at the wheel or ground level and its corresponding displacement/force at the Suspension spring or shock absorber (motion ratio and mechanical advantage).
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MODEL-VEHICLE EQUIVALENCE OF AUTOMOTIVE INDEPENDENT Suspension PARAMETERS
2015Co-Authors: Ion PredaAbstract:The vehicle Suspension design starts with studies on simple models, needing few input data. The aim of the initial model simulations is to choose the Suspension parameters able to ensure the a good compromise between comfort and dynamic vehicle qualities, at different travelling speeds and loads. The result of this stage is the setup on the model of the needed Suspension parameters, from which the stiffness of the Suspension springs and tires and the damping coefficient are the most important. After starting the design with initial layouts and dimensions of the Suspension Linkage, the model parameters must be “translated” to the real vehicle. This paper primarily deals with the Suspension model – real vehicle Suspension translation process. For the MacPherson, short-long arm and swing arm Suspensions, it is emphasizing the equivalence between a displacement or a force at the wheel or ground level and its corresponding displacement/force at the Suspension spring or shock absorber (motion ratio and mechanical advantage).
