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HOME > HSEA Technology > List of Analysis Examples

ANALYSIS
INTRODUCTION

Introduction to Analysis using the HSEA model

06

List of Analysis Examples

Gear Noise Analysis

Gear noise is an unusual noise that produces a noise at a fixed frequency depending on the speed of the rotation of transmission and other components. The amount of prominent becomes a problem if gear noise is larger than background noise such as road noise.

Gear Noise Analysis 01
Gear Noise Analysis 02

In the HSEA model, it is possible to efficiently reduce only gear noise without changing background noise using contribution and power flow.

Wind Noise Analysis

Wind noise analysis using a wind tunnel

  1. Acoustic input generated by wind pressure fluctuations
  2. Vibration input where wind hits the car body

Wind noise contribution can be separated into the two inputs

Wind Noise Analysis

Change of wind input can be simulated as body shape is changed by collaborating with Computational Fluid Dynamics (CFD).

It will be possible to evaluate the in-vehicle noise.

On-road driving noise analysis

Analysis for inputs when the vehicle is driving on road

  1. Acoustic input generated by wind pressure fluctuations
  2. Vibration input where wind hits the vehicle body
  3. Tire and engine input (other than wind input)

On-road driving nose input=①+②+③

On-road driving noise analysis

possible to make a more realistic evaluation, including wind noise.

Impact of specification changes can also be investigated

Pedal operation noise analysis

Example: 
Noise generated when the clutch is stepped
Left figure: 
Picture of pedal
Right figure: 
Output contribution during electric seat operation (in 315 Hz)
Pedal operation noise analysis

Noise generated when pedal is stepped can also be analyze by HSEA

Noise source / countermeasure location can be identified

Power Seat Analysis

Noise generated when the electric seat is moved back and forth

Left figure: 
Photo of electric seat switch
Right figure: 
Output contribution from dash panel (in 200 Hz)
Power Seat Analysis

Noise source / countermeasure location can be identified

Noise source / countermeasure location can be identified

Collaboration of FEM
(Finite Element Method) and HSEA

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Collaboration of FEM (Finite Element Method) and HSEA

FEM calculations for predicting changes of structure transfer function due to specification changes in structure modification

The change in structure transfer function of the structure modification calculated using FEM (Finite Element Method) is given to the HSEA model to evaluate the effect of the specification change of the structure modification on the noise inside the vehicle.

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