scholarly journals Implementation of Laminate Structure in Car Hood and Study of its NVH Parameters

2021 ◽  
Vol 9 (VII) ◽  
pp. 3696-3701
Author(s):  
Sarthak Bangale
Keyword(s):  
Natural Frequency ◽  
Energy Absorption ◽  
Weight Reduction ◽  
Torsional Stiffness ◽  
Core Material ◽  
Laminate Structure ◽  
Static Stiffness ◽  
Efficient Energy ◽  
Conventional Steel

This paper examines the implementation of Laminate structure and aluminium panels in Hood in place of conventional steel hood. In laminate structure, 3 layers is considered with aluminum as a face material and PVC Solid as a core material which helps in efficient energy absorption and provide necessary stiffness for the panel. It has been observed that the natural frequency is improved over conventional steel bonnets with benefit of weight reduction in hood assembly. To validate its NVH performance static stiffness, natural frequency and torsional stiffness has been calculated and it has been found that Laminate structure Hood has better performance than steel hood with overall weight reduction of 41.36%.

Experimental Analysis of Static Stiffness for Vehicle Body in White

2012 ◽  
Vol 248 ◽  
pp. 69-73 ◽  
Author(s):  
Shu Ming Chen ◽  
Xue Wei Song ◽  
Chuan Liang Shen ◽  
Deng Feng Wang ◽  
Wei Li
Keyword(s):  
Test Bench ◽  
Bending Stiffness ◽  
Torsional Stiffness ◽  
Vehicle Body ◽  
Torsional Angle ◽  
Static Stiffness ◽  
Torsional Deformation ◽  
Automotive Body ◽  
Body In White ◽  
Stiffness Characteristics

In order to know the static stiffness characteristics of the vehicle body in white, the bending stiffness and torsional stiffness of an automotive body in white were tested on a test bench of the static stiffness of an automotive BIW. The bending stiffness and bending deformation of the bottom of the BIW were determined. Also, the torsional stiffness and torsional deformation of the bottom of the BIW were obtained. The fitting curves and equations between loading torque and torsional angle were acquired at clockwise and counterclockwise loading, respectively.

Modeling of nonlinear torsional vibration of the automotive powertrain

2016 ◽  
Vol 24 (9) ◽  
pp. 1774-1786 ◽  
Author(s):  
Sérgio J Idehara ◽  
Fernando L Flach ◽  
Douglas Lemes
Keyword(s):  
Natural Frequency ◽  
Torsional Vibration ◽  
Degrees Of Freedom ◽  
Front Wheel ◽  
Torsional Stiffness ◽  
Bench Test ◽  
Passenger Car ◽  
Engine Torque ◽  
Friction Moment ◽  
Wheel Drive

A vibration model of the powertrain can be used to predict its dynamic behavior when excited by fluctuations in the engine torque and speed. The torsional vibration resulting from torque and speed fluctuations increases the rattle noise in the gearbox and it should be controlled or minimized in order to gain acceptance by clients and manufactures. The fact that the proprieties of the torsional damper integrated into the clutch disc alter the dynamic characteristic of the system is important in the automotive industry for design purposes. In this study, bench test results for the characteristics of a torsional damper for a clutch system (torsional stiffness and friction moment) and powertrain torsional vibration measurements taken in a passenger car were used to verify and calibrate the model. The adjusted model estimates the driveline natural frequency and the time response vibration. The analysis uses order tracking signal processing to isolate the response from the engine excitation (second-order). It is shown that a decrease in the stiffness of the clutch disc torsional damper lowers the natural frequency and an increase in the friction moment reduces the peak amplitude of the gearbox torsional vibration. The formulation and model adjustment showed that a nonlinear model with three degrees of freedom can represent satisfactorily the powertrain dynamics of a front-wheel drive passenger car.

The Research on Natural Characteristic and Eigensensitivity of Ravingneaux Compound Planetary Gear Sets

2013 ◽  
Vol 446-447 ◽  
pp. 590-596
Author(s):  
Bo Qian ◽  
Shi Jing Wu
Keyword(s):  
Natural Frequency ◽  
Planetary Gear ◽  
Torsional Stiffness ◽  
Ring Gear ◽  
Vibration Model ◽  
Planetary Gear Sets ◽  
Planet Gear ◽  
Natural Characteristic ◽  
Gear Ring ◽  
The Moment

The dynamic model of Ravingneaux compound planetary gear sets has been built. Then the Natural frequency and vibration model have been solved in the Ravingneaux compound planetary gear sets. The eigensensitivity to parameters have been researched based on the dynamical model. The varying trend of natural frequency according to the varying of parameters have been researched, which include gear mass (sun gear, ring gear , or planet gear), the moment of inertia of gears, the support stiffness , the torsional stiffness.

A Sensitivity-Based Approach to Improve Efficiency of Automotive Chassis Architecture

2013 ◽  
Author(s):  
Alessandro Valgimigli ◽  
Enrico Bertocchi ◽  
Alberto Lazzarini ◽  
Luca D’agostino ◽  
Luca Splendi
Keyword(s):  
Weight Reduction ◽  
Material Properties ◽  
Weight Ratio ◽  
Performance Standards ◽  
Torsional Stiffness ◽  
Response Analysis ◽  
Frequency Response Analysis ◽  
Automotive Market ◽  
Strong Competition ◽  
And Performance

The strong competition of the automotive market brings the industries to look continuously for more challenging comfort and performance standards. These requirements often contrast with the need for weight reduction related to the restrictive emissions limits. In this scenario, the investments aimed at increasing the structure efficiency (stiffness-to-weight ratio) become fundamental. The objective of this work is to propose a methodology that allows to identify the most important chassis areas in terms of efficiency: the design and research efforts could then be focused on the real determinant parts. This is done through a sensitivity process that works on frame subsystems and then on each component, first varying the material properties and then the thickness (and so the mass). The designing loadcases considered are the torsional stiffness, bending stiffness, modal analysis and frequency response analysis. The results show which are the most important subsystems and components that affects the chassis efficiency and that will have to be re-designed in order to improve the current architecture.

scholarly journals Quasi-Static Indentation Properties of Aluminium Foam-Frp Sandwich Panel

2018 ◽  
Vol 7 (3.11) ◽  
pp. 193
Author(s):  
Ummu Raihanah Hashim ◽  
Aidah Jumahat ◽  
Muhammad Fashan Md Ghazali
Keyword(s):  
Energy Absorption ◽  
Sandwich Panel ◽  
Polymeric Materials ◽  
Aluminium Foam ◽  
Core Material ◽  
Depth Of Penetration ◽  
Basalt Fibre ◽  
Reinforced Polymer ◽  
Static Indentation ◽  
Fibre Reinforced Polymer

Synthetic FRP have been used for many years in wide applications owing to their versatility and good performance. However, environmental problems caused by extensive use of polymeric materials arise mainly due to lack of landfill spaces and depletion of finite resources of fossil raw materials, such as petroleum or natural gas. Hence, materials derived from natural products are emerging as potential substitutes for petroleum-based material. The usage of natural fibre reinforced polymer (NFRP) composite have triggered considerable interest to explore the usefulness of this material. Excellent energy absorption of sandwich-structured composite made it a versatile structure used in various industries such transportation, automotive, building construction and marine. On top of that, the research data on aluminium foam as a core material in sandwich panel are limited and need to be further studied. This research is aimed to determine the quasi-static indentation properties of Basalt Fibre Reinforced Polymer/Aluminium Foam (BF-AF) sandwich panel and compare with the properties of Glass Fibre Reinforced Polymer/Aluminium Foam (GF-AF) sandwich panel. In this study, BFRP and GFRP composites with nanosilica were fabricated using vacuum bagging method. Aluminium foam was used as a core in the sandwich panel structure. The quasi-static indentation tests were performed using 10mm indenter and the specimen size was 50mm x 50mm with thickness of 3mm. The effect of aluminum foam on indentation properties were studied. The results showed that the addition of nanosilica enhanced the energy absorption, depth of penetration and damage area of the composites. The indentation properties of BF-AF were higher than those of GF-AF sandwich panel composites. Therefore, this research contributes to a new knowledge on the properties of aluminium foam-FRP composite materials

REGRESSION MODEL FOR LIGHT WEIGHT AND CRASHWORTHINESS ENHANCEMENT DESIGN OF AUTOMOTIVE PARTS IN FRONTAL CAR CRASH

2008 ◽  
Vol 22 (31n32) ◽  
pp. 5584-5589 ◽  
Author(s):  
GIHYUN BAE ◽  
HOON HUH ◽  
SUNGHO PARK
Keyword(s):  
Finite Element ◽  
Regression Analysis ◽  
Regression Model ◽  
Energy Absorption ◽  
Weight Reduction ◽  
Light Weight ◽  
Crash Analysis ◽  
Finite Element Analyses ◽  
Car Crash ◽  
Automotive Parts

This paper deals with a regression model for light weight and crashworthiness enhancement design of automotive parts in frontal car crash. The ULSAB-AVC model is employed for the crash analysis and effective parts are selected based on the amount of energy absorption during the crash behavior. Finite element analyses are carried out for designated design cases in order to investigate the crashworthiness and weight according to the material and thickness of main energy absorption parts. Based on simulations results, a regression analysis is performed to construct a regression model utilized for light weight and crashworthiness enhancement design of automotive parts. An example for weight reduction of main energy absorption parts demonstrates the validity of a regression model constructed.

Efficient energy absorption of intense ps-laser pulse into nanowire target

2016 ◽  
Vol 23 (6) ◽  
pp. 063105 ◽  
Author(s):  
H. Habara ◽  
S. Honda ◽  
M. Katayama ◽  
H. Sakagami ◽  
K. Nagai ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Energy Absorption ◽  
Efficient Energy

Numerical Simulation on Response of Foam Core Sandwich Panels Subjected to Underwater Explosion

2016 ◽  
Author(s):  
Dongjie Ai ◽  
Yuansheng Cheng ◽  
Jun Liu ◽  
Jianhu Liu ◽  
Haikun Wang ◽  
...  
Keyword(s):  
Energy Absorption ◽  
Sandwich Structures ◽  
Near Field ◽  
Sandwich Panels ◽  
Underwater Explosion ◽  
Core Material ◽  
Design Parameters ◽  
Equal Weight ◽  
Core Height ◽  
Panel Thickness

Sandwich panel structures, which consist of two thin faces and low relative density cores, can significantly mitigate the possibilities of panel fractures. In the present paper, numerical simulations are conducted to study the deformation and fracture modes of sandwich structures under near-field underwater blasts and contact underwater blasts. Two different core materials are employed, namely aluminum foam and PVC foam. Main focus of this paper was placed to (i) study the failure mechanisms and energy absorption characteristics of sandwich structures in typical conditions, (ii) to demonstrate the benefits of such structures compared with solid plates of equal weight, and (iii) to obtain the properties of withstanding underwater explosion for single core material sandwich panels. In addition, the effects of panel thickness configuration and core height on deformation and energy absorption of the plates were explored. Results indicated that sandwich structures showed an effective reduction in the maximum panel deflection compared with a monolithic plate of same mass. The design parameters have great impacts on the results.

Lightweight Sandwich Structures in Innovative Vehicle Design under Crash Load Cases

2016 ◽  
Vol 879 ◽  
pp. 2419-2427 ◽  
Author(s):  
Simon M. Brückmann ◽  
Horst E. Friedrich ◽  
Michael Kriescher ◽  
Gundolf Kopp ◽  
Roman Gätzi
Keyword(s):  
Energy Absorption ◽  
Sandwich Structures ◽  
Core Material ◽  
Analytical Determination ◽  
Energetic Efficiency ◽  
Failure Behavior ◽  
Vehicle Concept ◽  
Lightweight Construction ◽  
Structural Applications ◽  
Core Materials

On modern vehicles, the demand is made to be in every respect as efficient as possible. A technical method to increase energetic efficiency is to reduce the vehicle mass through the implementation of lightweight construction measures. The energy consumption decreases by that and the vehicle dynamics behavior of conventionally and alternatively respectively electrically powered vehicles increases. In the department Lightweight and Hybrid Design Methods of the Institute of Vehicle Concepts in Stuttgart in collaboration with 3A Composite Core Materials, a method which allows to realize sandwich structures for automotive structural applications analytically and conceptually, is developed. The development method based on material and component testing and material values would be determined at different loads, for example in pressure and in-plane tests. These values are transmitted into the analytical determination of so called failure mode maps to derive appropriate sandwich structures. With novel sandwich structures the objectives of high structural stiffness and strength are tracked, as well as a high level of energy absorption potential. By function integrating the potential of lightweight construction, depending on the energy absorption per structural weight, can be further increased. Accompanying tests on generic structures are made to validate the failure behavior. Also the influence of core material on the deformation behavior is examined. The results from the tests are transferred to a vehicle front structure of a planned lightweight vehicle of class L7E called "Safe Light Regional Vehicle" (SLRV). The behavior of the structure is examined in static and dynamic tests. The energy absorbing capacity can be further increased by geometric optimization and the use of different core materials. The research on sandwich materials is part of the research project Next Generation Car (NGC) of the DLR and represents in terms of the new vehicle concept SLRV in sandwich design a novel vehicle concept of this joint project.

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