BIW Modal Analysis and Research Based on the NVH

2013 ◽  
Vol 281 ◽  
pp. 299-303 ◽  
Author(s):  
Mao Ting Li ◽  
Hua Jin Yan ◽  
Li Ming Ai
Keyword(s):  
Finite Element ◽  
Structural Optimization ◽  
Modal Analysis ◽  
Resonance Peak ◽  
The Body ◽  
Stiffness Analysis ◽  
The Core ◽  
Body In White ◽  
Research Objects ◽  
Local Stiffness

The car body-in-white as the core research objects, NVH performance based on white body in finite element modeling and numerical modal analysis, this paper finds out the natural frequency of vibration may cause the BIW’s resonance. It indicates the direction to improve body-in-white NVH performance, local stiffness and further structural optimization through testing modal, stiffness analysis and NTF / VTF experiments to validate the numerical results of the modal analysis of the credibility and the body-in-white how much frequency or frequency band resonance peak caused by the body.

Finite Element Analysis and Optimization of S1110 Diesel Engine Body

2012 ◽  
Vol 268-270 ◽  
pp. 837-840
Author(s):  
Sen Zhao ◽  
Xiao Hui Cao
Keyword(s):  
Finite Element ◽  
Diesel Engine ◽  
Cylinder Liner ◽  
The Body ◽  
Mass Ratio ◽  
Cast Aluminum ◽  
Optimization Scheme ◽  
Element Analysis ◽  
Stiffness Analysis ◽  
Structural Intensity

In order to reduce the mass ratio of S1110 diesel engine, structural intensity and stiffness analysis are performed on the assembly parts of engine body by using the finite element method. Through comparative analysis of more than one calculation scheme, optimization scheme has been got. To ensure the intensity and stiffness of the engine body is not reduced under the premise, optimization scheme makes the body mass greatly reduced from the original engine body’s 38kg to 13.8kg and the engine mass ratio is reduced from 13.2kg/kW to 11.81kg/kW. The results show that, changing the body material from cast iron materials to cast aluminum materials, the body stress distribution trends are similar, but the cast aluminum body deformation increases; increasing the number of cylinder head bolts to 6 can reduce the deformation of the cylinder liner; a reasonable set of stiffeners can reduce the bearing bore deformation.

Additive manufacturing and topology optimization: A design strategy for a steering column mounting bracket considering overhang constraints

2020 ◽  
pp. 095440622091771
Author(s):  
Sara Mantovani ◽  
Giuseppe A Campo ◽  
Andrea Ferrari
Keyword(s):  
Finite Element ◽  
Topology Optimization ◽  
Additive Manufacturing ◽  
Isotropic Material ◽  
Element Model ◽  
The Body ◽  
Left Hand ◽  
Automotive Body ◽  
Body In White ◽  
Overhang Angle

In the present paper, the use of the topology optimization in a metal Additive Manufacturing application is discussed and applied to an automotive Body-in-White component called dash. The dash is in the front area of the Body-in-White, between the left-hand-side shock-tower and the Cross Car Beam, and its task is to support the steering column. The dash under investigation is an asymmetric rib-web aluminium casting part. The influence of Additive Manufacturing constraints together with modal and stiffness targets is investigated in view of mass reduction. The constraints drive the topology result towards a feasible and fully self-supporting Additive Manufacturing solution. A simplified finite element model of the steering column and of the Body-in-White front area is presented, and the limiting assumption of isotropic material for Additive Manufacturing is discussed. The optimization problem is solved with a gradient-based method relying on the Solid Isotropic Material with Penalization and on the RAtional Material with Penalization algorithms, considering the overhang angle constraint with given build directions. Three metals are tested: steel, aluminium and magnesium alloys. Topology optimization results with and without overhang angle constraints are discussed and compared. The aluminium solution, preferred for its lesser weight, has been preliminarily redesigned following the optimization results. The new dash concept has been validated by finite element considering stiffness, modal responses, and buckling resistance targets. The proposed dash design weighs 721 g compared to the 1537 g of the reference dash, with a weight reduction of 53%, for the same structural targets.

Model Analysis of Car’s Body-in-White Based on FEA

2011 ◽  
Vol 354-355 ◽  
pp. 454-457
Author(s):  
Yuan Wang ◽  
Li Xu ◽  
Xi Liang Dai ◽  
Sheng Hui Peng
Keyword(s):  
Finite Element ◽  
Optimal Design ◽  
Finite Element Model ◽  
Element Model ◽  
Model Analysis ◽  
The Body ◽  
Dynamic Parameters ◽  
Modal Test ◽  
Body In White ◽  
The Finite Element Model

In this paper, the finite element model of some car’s body-in-white is established in Hypermesh. The model analysis is executed based on the element model in ANSYS. Through the model analysis the dynamic parameters of the body-in-white are obtained. At the same time，the modal test of a real car body is implemented. The reliability of the finite element model is validated based on the modal test. The results show that the stiffness of the body-in-white is great enough and it can provide optimal design for future designers.

Finite element model updating of composite with adhesive jointed structure under built-up internal stress

2021 ◽  
pp. 107754632199358
Author(s):  
Ahmad Burhani Ahmad Basri ◽  
Dong Wook Chae ◽  
Hyeongill Lee
Keyword(s):  
Finite Element ◽  
Composite Structures ◽  
Model Updating ◽  
Local Stress ◽  
Element Model ◽  
The Body ◽  
Engineering Structures ◽  
Resonance Frequencies ◽  
Body In White ◽  
The Difference

Highly complex engineering structures such as the body-in-white of a car consist of hundreds of different parts that are assembled using various types of joints such as welded and adhesive joints. The finite element method has been used extensively in various engineering fields to predict and analyze the dynamic behavior of assembled structures. However, despite the use of well-characterized individual subcomponent models, the predicted results frequently differ from measured results. This is believed to be because of the invalid assumptions of the joint model such as the material properties and other uncertainties associated with the assembly. This study investigated the use of a model updating method (MSC Nastran SOL 200) to identify the invalid assumptions and uncertainties in adhesive jointed composite structures and to minimize the difference between predicted and measured results. Results revealed that the stresses built-up in a structure during the assembly process are permanently retained in the structure after the adhesive is completely cured and that they cause a local stress stiffening effect, which is believed to affect the resonance frequencies of the structure. Introducing the effect of the stresses as an updating parameter in the model updating process increases the prediction accuracy.

Modal Analysis of 160KVA Dry-Type Transformer Based on ANSYS

2012 ◽  
Vol 229-231 ◽  
pp. 919-922
Author(s):  
Bao Dong Bai ◽  
Guo Hui Yang ◽  
Bing Yin Qu ◽  
Jian Zhang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Modal Analysis ◽  
Noise Level ◽  
Natural Frequencies ◽  
Analysis Software ◽  
Element Analysis ◽  
The Core ◽  
The Finite Element Analysis ◽  
Simulation Results

In this paper, the modal analysis was carried out on the core and cavity of a 160KVA dry-type transformer based on the finite element analysis software of ANSYS. And the simulation results of the natural frequencies and modal shapes were obtained, which provided a theoretical guidance to the design of the transformer structure, and were meaningful to reduce the vibration and noise level of the transformer.

Finite Element Modal Analysis of the Frame of Corn Stubble-Collector

2012 ◽  
Vol 430-432 ◽  
pp. 1072-1075
Author(s):  
Jin Tong ◽  
Bai Gong Zeng ◽  
Dong Hui Chen ◽  
Long Zhe Quan ◽  
Shu Jun Zhang
Keyword(s):  
Finite Element ◽  
Modal Analysis ◽  
Dynamic Characteristics ◽  
Natural Frequencies ◽  
Solid Model ◽  
Vibration Modes ◽  
Core Component ◽  
Design And Optimization ◽  
The Core ◽  
Ansys Workbench

In this paper, one kind of agriculture machines with picking and separating soil was designed to collect corn stubble. The core component of the machine is the frame of corn stubble-collector. The 3-D solid model of the frame of corn stubble-collector was designed using Pro/Engineer software. The first 10 natural frequencies and vibration modes of the frame were obtained by means of the finite element modal analysis in the ANSYS-Workbench software, and analyze the dynamic characteristics of the frame, which can be used to provide some theory basis for design and optimization of the frame.

Component mode synthesis methods for a body-in-white noise and vibration analysis

2016 ◽  
Vol 231 (2) ◽  
pp. 279-288 ◽  
Author(s):  
Simone Vizzini ◽  
Magnus Olsson ◽  
Alessandro Scattina
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
The Body ◽  
Component Mode Synthesis ◽  
Synthesis Methods ◽  
Dynamic Substructuring ◽  
Reduction Methods ◽  
Body In White ◽  
Noise Vibration

In this work the dynamic substructuring approach was applied to a noise, vibration and harshness problem within the automotive engineering field. In particular, a noise, vibration and harshness analysis was carried out on the body-in-white structure of a passenger car. The work focuses on the theory of component mode synthesis. Two component mode synthesis reduction methods, namely the Craig–Bampton method and the Craig–Chang method, were applied to the body-in-white structure of the Volvo V40. The influences of various parameters were investigated. In particular, the effect of the reduction basis on the response accuracy and on the reduction time was studied. Moreover, the effects of the connection properties between different parts of the model were examined. The simulation times of the reduced models and of the full finite element model were compared. The results showed that the Craig–Chang method performs better when the modes are retained for up to one and a half times the maximum frequency response studied. Additionally, the Craig–Chang method gives a very accurate representation of the system dynamics even when connections with a low stiffness are used. Finally, it is possible to reduce the simulation time by up to 90% if component mode synthesis methods are used instead of the full finite element model.

The Concept modeling method: An approach to optimize the structural dynamics of a vehicle body

2020 ◽  
Vol 234 (13) ◽  
pp. 2923-2932 ◽  
Author(s):  
Mohammad Fard ◽  
Jianchun Yao ◽  
Richard Taube ◽  
John Laurence Davy
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Structural Dynamics ◽  
Element Model ◽  
Modeling Method ◽  
The Body ◽  
Vehicle Body ◽  
Concept Model ◽  
Body In White ◽  
Concept Modeling

Although the concept modeling method has already been proposed in the literature, there is still very limited knowledge about the validation and the application of this method for vehicle body design. This paper substantially increases this limited knowledge by developing a concept model for predicting and optimizing the structural dynamics of a vehicle body-in-white and validating this concept model against a detailed finite element model. The geometry and parameters of the concept model are extracted from its detailed finite element model. The major members and panels of the detailed finite element model are replaced by their equivalent beam and shell elements models. The joints of the concept model are represented by stiffness and mass matrices extracted from the detailed finite element model using the Guyan Reduction Method. The developed concept model is validated by comparing its structural dynamics, including the resonant frequencies and the vibration mode shapes, with the original detailed finite element model and the experimental results. The simplicity and small size of the concept model enable it to easily enhance the structural dynamics of the body-in-white by optimizing the cross-sections of the load-carrying members of the structure. The optimization in this case increased the resonant frequencies of the body-in-white while reducing the total mass by about 6 kg. The results prove that the concept modeling method can significantly enhance the body-in-white structural dynamics by reducing the complexity of the model and allowing the focus for the optimization to be on the main members of the structure at the development stage when the final design parameters are not well known and have not been fixed.

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