The Experts below are selected from a list of 1650 Experts worldwide ranked by ideXlab platform
Airton Nabarrete - One of the best experts on this subject based on the ideXlab platform.
-
Parametric Stochastic Analysis of a Piezoelectric Vibration Absorber Applied to Automotive Body Structure
Journal of Vibration Engineering & Technologies, 2019Co-Authors: Francisco Scinocca, Airton NabarreteAbstract:ObjectiveThis paper presents a systematic approach to quantify the uncertainties that influences directly the design of a Piezoelectric Vibration Absorber applied to shell Structures with arbitrary shape, normally employed in Automotive Body Structures.MethodologySensitivity and spectral analyses are performed to study the impact of randomness in the optimal piezoelectric patch implementation in Automotive Structures. The randomness arising from the manufacturing process of the mechanical Structure, such as stamping spring back effects, as well as in the boundary conditions, is considered in the analyses, likewise the effects of variability during the positioning process for piezoelectric patches. The effects of the inherent uncertainties in the dynamic behavior of the mechanical Structure, the optimal electromechanical coupling coefficient and the piezoelectric vibration absorber attenuation are presented.ResultsThe present paper has the advantage of indicating the loss in the vibration attenuation when Piezoelectric Vibration Absorbers are used in arbitrary shape Structures, such as Automotive hoods, fenders and doors. The Dynamic Vibration Absorber deterministically optimized provides an attenuation of approximately 18 dB in the theoretical model. However, losses of 5 dB in the attenuation can be obtained when the uncertainties are taken into account, and can reach up to 10 dB when the temperature effects are involved, representing more than 50% loss in attenuation for real applications, such as Automotive Body Structures.
-
Parametric Stochastic Analysis of a Piezoelectric Vibration Absorber Applied to Automotive Body Structure
Journal of Vibration Engineering & Technologies, 2019Co-Authors: Francisco Scinocca, Airton NabarreteAbstract:Objective This paper presents a systematic approach to quantify the uncertainties that influences directly the design of a Piezoelectric Vibration Absorber applied to shell Structures with arbitrary shape, normally employed in Automotive Body Structures.
Francisco Scinocca - One of the best experts on this subject based on the ideXlab platform.
-
Parametric Stochastic Analysis of a Piezoelectric Vibration Absorber Applied to Automotive Body Structure
Journal of Vibration Engineering & Technologies, 2019Co-Authors: Francisco Scinocca, Airton NabarreteAbstract:ObjectiveThis paper presents a systematic approach to quantify the uncertainties that influences directly the design of a Piezoelectric Vibration Absorber applied to shell Structures with arbitrary shape, normally employed in Automotive Body Structures.MethodologySensitivity and spectral analyses are performed to study the impact of randomness in the optimal piezoelectric patch implementation in Automotive Structures. The randomness arising from the manufacturing process of the mechanical Structure, such as stamping spring back effects, as well as in the boundary conditions, is considered in the analyses, likewise the effects of variability during the positioning process for piezoelectric patches. The effects of the inherent uncertainties in the dynamic behavior of the mechanical Structure, the optimal electromechanical coupling coefficient and the piezoelectric vibration absorber attenuation are presented.ResultsThe present paper has the advantage of indicating the loss in the vibration attenuation when Piezoelectric Vibration Absorbers are used in arbitrary shape Structures, such as Automotive hoods, fenders and doors. The Dynamic Vibration Absorber deterministically optimized provides an attenuation of approximately 18 dB in the theoretical model. However, losses of 5 dB in the attenuation can be obtained when the uncertainties are taken into account, and can reach up to 10 dB when the temperature effects are involved, representing more than 50% loss in attenuation for real applications, such as Automotive Body Structures.
-
Parametric Stochastic Analysis of a Piezoelectric Vibration Absorber Applied to Automotive Body Structure
Journal of Vibration Engineering & Technologies, 2019Co-Authors: Francisco Scinocca, Airton NabarreteAbstract:Objective This paper presents a systematic approach to quantify the uncertainties that influences directly the design of a Piezoelectric Vibration Absorber applied to shell Structures with arbitrary shape, normally employed in Automotive Body Structures.
Noboru Kikuchi - One of the best experts on this subject based on the ideXlab platform.
-
First order analysis for Automotive Body Structure design - Part 2 : Joint analysis considering nonlinear behavior
SAE Technical Paper Series, 2004Co-Authors: Yasuaki Tsurumi, Hidekazu Nishigaki, Tatsuyuki Amago, Toshiaki Nakagawa, Katsuya Furusu, Noboru KikuchiAbstract:We have developed new CAE tools in the concept design process based on First Order Analysis (FOA). Joints are often modeled by rotational spring elements. However, it is very difficult to obtain good accuracy. We think that one of the reasons is the influence of the nonlinear behavior due to local elastic buckling. Automotive Body Structures have the possibility of causing local buckling since they are constructed by thin walled cross sections. In this paper we focus on this behavior. First of all, we present the concept of joint analysis in FOA, using global-local analysis. After that, we research nonlinear behavior in order to construct an accurate joint reduced model. (1) The influence of local buckling is shown using uniform beams. (2) Stiffness decrease of joints due to a local buckling is shown. (3) The way of treating joint modeling considering nonlinear behavior is proposed.
-
First Order Analysis for Automotive Body Structure Design - Part 1: Overview and Applications
SAE Technical Paper Series, 2004Co-Authors: Hidekazu Nishigaki, Shinji Nishiwaki, Tatsuyuki Amago, Hideki Sugiura, Yoshio Kojima, Noboru KikuchiAbstract:Computer Aided Engineering (CAE) has been successfully utilized in Automotive industries. CAE numerically estimates the performance of automobiles and proposes alternative ideas that lead to the higher performance without building prototypes. Most Automotive designers, however, cannot directly use CAE due to the sophisticated operations. In order to overcome this problem, we proposed a new concept of CAE, First Order Analysis (FOA). The basic ideas include (1) graphic interfaces using Microsoft/Excel to achieve a product oriented analysis (2) use the knowledge of the mechanics of materials to provide the useful information for designers, and (3) the topology optimization method using beam and panel elements. In this paper, outline of FOA and application are introduced.
-
First Order Analysis for Automotive Body Structure Design
Volume 2: 26th Design Automation Conference, 2000Co-Authors: Hidekazu Nishigaki, Shinji Nishiwaki, Tatsuyuki Amago, Noboru KikuchiAbstract:Abstract The concept of Computer Aided Engineering (CAE) was first proposed by J. Lemon at SDRC, and has been widely accepted in Automotive industries. CAE numerically estimates the performance of automobiles and proposes alternative ideas that lead to the higher performance without building prototypes. However, most Automotive designers cannot directly utilize CAE since specific well-trained engineers are required to achieve sophisticated operations. Moreover, CAE requires a huge amount of time and many modelers to construct an analysis model. In this paper, we propose a new concept of CAE, First Order Analysis (FOA), in order to overcome these problems and to quickly obtain optimal designs. The basic ideas include (1) graphic interfaces for Automotive designers using Microsoft/Excel (2) use of sophisticated formulations based on the theory of mechanics of material, (3) the topology optimization method. Further, some prototypes of software are presented to confirm the method for FOA presented here.
Chen Jianghong - One of the best experts on this subject based on the ideXlab platform.
-
Modal analysis on fluid-Structure coupling system of Automotive Body Structure and cavity
Computer-Aided Engineering, 2007Co-Authors: Chen JianghongAbstract:To study the vibration and noise characteristics of automobile,the finite element model of an Automotive Body Structure and cavity is established with shell,beam and fluid element by using ANSYS.In the model,the Body Structure is taken as elastic Body and the air in passenger compartment is taken as fluid.The modal analysis is done for Automotive Body,fluid of cavity and their coupling Structure.The results of three cases are compared and their relationship is obtained,which benefits the automobile vibration and noise research.
Ramakrishna Koganti - One of the best experts on this subject based on the ideXlab platform.
-
Resistance Spot Welding (RSW) Evaluation of 1.0 mm Usibor® 1500 P to 2.0 mm Usibor® 1500 P Steel for Automotive Body Structure Applications
Volume 3: Design and Manufacturing Parts A and B, 2010Co-Authors: Ramakrishna Koganti, Adrian Nicholas Alexander Elliott, Donald F. MaatzAbstract:There has been a substantial increase in the use of advanced high strength steel (AHSS) in Automotive Structures in the last few years. The usage of these materials is projected to grow significantly in the next 5–10 years with the introduction of new safety and fuel economy regulations. AHSS are gaining popularity due to their superior mechanical properties and use in parts for weight savings potential, as compared to mild steels. These new materials pose significant manufacturing challenges, particularly for welding and stamping. Proper understanding of the weldability of these materials is critical for successful application on future vehicle programs. Due to the high strength nature of AHSS materials, higher weld forces and longer weld times are often needed to weld these advanced strength steels. In this paper, the weld current lobes, mechanical properties (shear tension and cross tension), metallographic cross-section and microhardness profile of 1.0 mm Usibor® 1500 P and 2.0 mm Usibor® 1500 P joint in a two-metal stackup are discussed. Weld lobes were developed with Medium Frequency Direct Current (MFDC) equipment, ISO-type B16 tips, weld force of 3.42 kN and hold time of 5 cycles. The weld times were varied at 12, 15 and 18 cycles, with each producing current ranges at or below 3.0 kA. Tensile shear and cross tension samples were made at weld time of 15 cycles, with samples showing average loads of 15.73 kN and 4.41 kN, respectively. Also, microhardness assessment using metallographic cross-sections were analyzed at three different weld cycles (12, 15, and 18 cycles). Voids were observed at 12 and 15 weld cycles, however there was no void at 18 cycles. Similar heat affected zones (HAZ) and weld zones were observed for three different weld cycles.© 2010 ASME
-
Material Characterization of Uncoated Boron Steel for Automotive Body Structure Applications
ASME 2008 International Manufacturing Science and Engineering Conference Volume 2, 2008Co-Authors: Ramakrishna Koganti, Sergio Angotti, Ron Cooper, Dan Houston, Asif Waheed, T. H. TopperAbstract:Use of Advanced High Strength Steels in Automotive applications is increasing. One of these materials is boron steel, which is commercially available in coated and uncoated sheets. Automotive manufacturers are using boron steel in Body Structure applications to produce light weight parts and to address safety requirements. Boron steel is available in a non heat-treated condition (also referred to as “green state”) which typically has a yield strength around 350 MPa. The yield strength for a fully temperature hardened boron steel increases to above 1000 MPa, depending on heat treatment temperature and quenching methods used. In this report, the static and fatigue properties of uncoated boron steel were evaluated. One objective was to understand whether these properties varied with respect to the material rolling direction (longitudinal, transverse and diagonal). For static strength analysis three different gages (1.0 mm, 1.5 mm and 2.0 mm) were evaluated. For fatigue evaluation, 3.0 mm thickness boron steel was evaluated. Based on the mechanical test data, ultimate tensile strength was not statistically significant in all three directions (longitudinal, transverse and diagonal) among three gages chosen. However, within the same gage, ultimate tensile strength is statistically significant in all three directions. 0.2% offset Yield strength and total elongation are uniform in all gages as well as in all three directions within each gage. However, uniform elongation (at max. load condition) was significant among the gages as well as within the same gages. A comparison of the monotonic and cyclic stress strain curves indicates boron steel is a strain-softening material.
-
Current Trends of Hydroforming Process Into Automotive Body Structure and Chassis Applications
Volume 3: Design and Manufacturing, 2007Co-Authors: Ramakrishna Koganti, Jason Scott Balzer, Klaus HertellAbstract:Recent low emission, lightweight, safety requirements, Automotive manufacturers are implementing lighter and stronger materials and new manufacturing processes into Body structural components. Typical widely used forming process in Automotive Body Structures is stamping process. Other forming processes currently used in Body structural applications are hydroforming, Rollforming and hot stamping processes. Initially, hydroforming process was used for chassis applications. Few applications of chassis are cross members, engine cradle, instrument panel (IP) beams, and bumper beams. Recently, a few Automotive manufacturers are already implemented the hydroforming process into front end Structures. Hydroform process gives more part consolidation, and perhaps even weight reduction. However, depending on applications some brackets may be needed to attach other components. Some of the issues related to bracket attachments can be avoided in the design phase. Audi A2, and Chrysler Pacifica have implemented roof rails in the Body Structures arena. Latest developments are even pushing the hydroforming process into High Strength Steels arena. Pontiac Solstice and Saturn Sky implemented Dual Phase 600 material on the chassis rails. In this paper, current trends of hydroforming process with advanced high strength steels (AHSS) will be discussed. Hydroforming process involves, bending, preforming (low pressure), and final forming (high pressure) with mechanical properties of DP780 material at various stages of the hydroforming process will be discussed.Copyright © 2007 by Ford Motor Company
