NVH analysis technology is of great significance and has a profound impact on the automotive industry. Automobile manufacturers can solve NVH problems by establishing theoretical models, understand its generation process through these models, and designers can raise specific problems based on the actual situation and find the most reasonable control schemes.

Application of NVH Analysis Technology in the Development of New Energy Vehicles

If automotive-related personnel want to grow and develop in the highly competitive market, they must meet customer needs and improve the NVH performance of automobiles. Automobiles with good NVH performance can increase the added value of products and help automobile sellers seize the market and win more market share. Studying the NVH characteristics of automobiles is not only for eliminating automobile noise but also for the development of the entire automotive industry.

1. Noise Analysis of Electric Drive Assemblies

The above pictures show the calculation model of the electric drive assembly and the sound radiation cloud chart.

The above picture shows the analysis of the contribution amount of the noise radiation plate.

Starting from aspects such as the excitation source (own structure) of the electric drive assembly, control strategies, structural transmission paths, and acoustic enclosures, measure the effects of each scheme in practice. Meanwhile, consider the time cycle and cost factors to determine the final solution.

2. Optimization of Automobile Damping Sheets

In order to improve the sound insulation performance of thin metal sheets on automobiles (such as firewalls, door panels, floors, and trunk lids), damping sheets are widely used. Considering the requirements of cost control and lightweight design, the optimization of damping sheets has become an increasingly important part of the design.

Build a damping-coupled calculation model.

The noise inside the vehicle is an important factor affecting the comfort of passengers. During the driving process of motor vehicles, they will be excited by the road surface, and this excitation will be transmitted into the vehicle body through the chassis mounting points, causing the cab to rumble and affecting the riding comfort of the driver and passengers. To reduce the noise inside the vehicle, engineers arrange damping sheets on the body panels.

3. Analysis and Optimization of Automobile Wind Noise

1. AWPF "Volume Sound Source" + TWPF "Turbulent Pulsation Sound Source Verification"

2. Wind Noise Analysis Calculation Model

3. Wind Noise Analysis Calculation Results

4. Time-Averaged Vorticity Diagram of Wind Noise Analysis and Sound Pressure on the Window Surface

5. Door Sound Insulation Analysis Case

6. Front Panel Sound Insulation Analysis Case

7. Floor Sound Insulation Analysis Case

NVH analysis requires manufacturers to optimize automobile parts and improve the relevant structures of components that generate vibration and noise. We can start by improving the vibration characteristics of components to solve problems targetedly and avoid resonance effects. In addition, we can improve the balance of rotating elements to optimize and improve the NVH characteristics of automobiles. In automobiles, we can apply sounds with amplitudes equivalent to those of noise sources but with opposite phases to finally achieve the effect of controlling vibration and noise. Designers need to analyze the structure of automobiles and record the transmission characteristics of automobile vibration. Through data analysis and processing, vibration and noise can be effectively attenuated finally. Reasonable engine mounts are the key to improving automobile performance.