International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 11 Issue: 07 | July 2024
www.irjet.net
p-ISSN: 2395-0072
Research on Vibration Characteristics and Structural Optimization of Battery Bracket in Electric Vehicles Li Zhouji1, Intan Irieyana Bint Zulkepli 2 1Student, Faculty of Engineering & Built Environment, Lincoln University College, Kuala Lumpur, Malaysia
2 Assistant Professor, Faculty of Engineering & Built Environment, Lincoln University College, Kuala Lumpur,
Malaysia ---------------------------------------------------------------------***--------------------------------------------------------------------2. LITERATURE REVIEW Abstract - The structural design of the electric vehicle battery bracket significantly affects the noise, vibration, and harshness (NVH) characteristics of the electric vehicle. This paper takes the battery bracket as its object of study, examining its vibration characteristics through frequency response analysis and modal analysis. The aim is to verify the validity of the support structure design. This paper takes the battery bracket as its object of study, employing frequency response analysis and modal analysis to investigate its vibration characteristics and validate the rationality of the structural design of the battery bracket. Firstly, a 3D model of the battery bracket was constructed, and a run strength analysis and constrained modal analysis were conducted using the NASTRAN solver. The results demonstrate under the forward and downward working conditions, the maximum stress exceeds the yield strength of the material. Additionally, the first-order mode is below the idle excitation of the engine. Following the design principle of the bracket structure, the original structure is optimized by increasing the thickness of the bracket steel plate and the number of connection points. The simulation results demonstrate that the stiffness of the optimized bracket enhances the design requirements. Consequently, this research provides a theoretical basis for the design and optimization of the bracket structure.
The battery bracket of an electric vehicle is a component of the body system, the function is to mount the battery on the body. The battery bracket is situated close to the powertrain. Consequently, any vibrations transmitted from the powertrain will also affect the battery bracket, which will then be transmitted to the vehicle body. This results in an increase in noise and vibration levels within the body [5]. It is imperative to analyze and optimize the vibration characteristics of the battery bracket during the development and design of the vehicle body, which plays a positive role in shortening the design cycle and reducing the development cost. In the literature [6], the finite element technique was employed to conduct both strength and modal analyses for the water tank bracket of a light truck, along with subsequent road verification and modal testing. In the literature [7], a solution to the cracking problem of a light truck sub-tank bracket was sought through a vibration strength analysis of its finite element model. The literature [8] presents a power battery bracket scheme devised by the established design principles. Through finite element technology, the structure of the power battery bracket is subjected to modal analysis, impact strength analysis, frontal collision simulation analysis, and mounting bolt force analysis. This enables achieving a stable, fixed-power battery within the smallest possible space.
Key Words: electric vehicle battery bracket, strength analysis, modal analysis, vibration characteristics.
Literature [9] performed a frequency response analysis of the pipeline to obtain the effect of acceleration excitation on the stress distribution of the pipeline system. Literature [10] solved the fracture problem of air condition lines by adding brackets, which can avoid the excitation sympathetic vibration. To address the fracture issue associated with the urea tank bracket of trucks, a strength analysis was conducted using ANSYS Workbench software. The analysis result revealed that the maximum stress location was identical to the actual fracture location. The stress of the urea tank bracket was significantly diminished through the implementation of reinforcement and protection measures.
1. INTRODUCTION Noise, vibration, and harshness (NVH) performance are important indicators of vehicle quality. The vibration and noise problems during use are not only a source of pollution of the sound environment outside the vehicle but also cause discomfort and even injury to occupants or cargo within the vehicle [1-2]. A vehicle's NVH target system comprises four levels: vehicle level, system level, subsystem level, and component level. To achieve the NVH target of the entire vehicle, it is necessary to design and adjust the components within each system so that they can ensure that the performance of the entire vehicle aligns with the design requirements during the synthesis process from the top-down approach [3-4].
© 2024, IRJET
|
Impact Factor value: 8.226
This paper presented a 3D model of the battery bracket based on a real vehicle and carried out a strength analysis and a constrained modal analysis using the NASTRAN
|
ISO 9001:2008 Certified Journal
|
Page 1256