Reverse Engineering & Benchmarking

NVH & ride comfort benchmark data for BEVs
CAE models developed via reverse engineering
~ As a benchmark for vehicle-to-vehicle comparisons, setting development targets, and establishing performance improvement guidelines ~

ESTECH provides various benchmarking—essential processes in product development—in accordance with customers Requirements.

  • 1.
    We provide driving tests, Transfer Path Analysis (TPA), and eAxle unit excitation data—primarily for BEVs—to improve NVH and ride comfort. By adding TPA results to the final performance, you can also use them to study performance allocation to components and subsystems. We deliver high-accuracy measurement and analysis data backed by ESTECH’s extensive experience.
  • 2.
    Using 3D measuring equipment, we develop FE meshes faithful to the actual hardware geometry and verify model accuracy through excitation tests. We provide CAE models with sufficiently high accuracy for practical use.

1. NVH & ride comfort benchmark data for BEVs

Target vehicles (BEV)

Four BEV models made by various OEMs are available; more will be joined to the lineup.

NISSAN Sakura X
BMW iX3 M Sport
BYD DOLPHIN Long Range
SUBARU Solterra ET-SS
Scrollable.
Test track (JARI) Driving conditions Measured data
High-speed circular track (motor noise, gear noise) Acceleration Torque 5 spec, 0.1G, 0.2G
  • Interior noise (ear position)
  • Driver floor vibration
  • Steering vibration
  • Subframe or suspension mounting point vibration
  • Knuckle vibration
  • eAxle mount vibration
  • Near-field sound at the eAxle
  • Vehicle speed
  • Driveshaft torque
  • Driveshaft rotation
Deceleration Coasting from top speed (up to 200 km/h)
Constant speed 10 km/h to top speed (≤ 200 km/h), in 10 km/h increments
NVH / multi-purpose tests
Noise test track (road noise)
Vibration test track (ride comfort)
 Constant speed
  • 20km/h
  • 40km/h
  • 60km/h
  • 80km/h

Transfer Path Analysis (TPA)

We provide high-accuracy Transfer Path Analysis results packed with ESTECH’s experiences for NVH and ride comfort.

Scrollable.
Test tracks (JARI) and driving conditions Equivalent force
(Blocked Force)		 Input path contribution
High-speed circular track
Acceleration / Deceleration
Gear noise / motor noise
  • Volume acceleration near the eAxle unit
  • eAxle unit mount points
Interior noise (ear position)
Driver floor vibration
Constant speed
  • Subframe or suspension mounting points
NVH / multi-purpose test tracks
  • Noise test track (road noise)
  • Vibration test track (ride comfort)
 Constant speed
  • Subframe or suspension mounting points

eAxle unit excitation data

Scrollable.
Dynamic stiffness Experimental modal analysis
  • Mount bracket
  • Case surface
  • Target: bending modes, torsional modes
  • Modal parameters
  • Transfer functions for curve fitting

Deliverable data

Scrollable.
Item Driving data TPA data
(including excitation data)
High-speed circular track
Acceleration / Deceleration
Gear noise / motor noise
 Available Available
Constant speed Available Available
NVH / multi-purpose test tracks Noise test track (road noise) Available Available
Vibration test track (ride comfort) Available Available
Standalone eAxle unit excitation test data Excitation data, Experimental modal analysis data

Deliverable data formats

  • Universal File
  • Other general formats available on request

2. CAE models developed via reverse engineering

Leveraging testing and analysis technologies for road noise over years, we developed suspension finite element models of various vehicles via reverse engineering. We conducted our own vibration tests and performed model correlation based on the test results, achieving sufficient accuracy for practical use.

Front suspension
Rear suspension

Features

  • Correlated up to 400 Hz, that is enough for the road noise region.
  • Correlated based on excitation test results for each component, including stiffness of link bushings and joints, faithfully predicting the vehicle’s vibration characteristics.
  • Suspension component eigenmodes are verified by comparison with modal analysis results on the actual vehicle.
  • The tire model uses a high-accuracy modal model built with ESTECH’s proprietary technology, enabling analyses that include the tire’s contribution to road noise performance.
(Reference) Comparison of front-wheel test data and analysis results
(Reference) Comparison of rear-wheel test data and analysis results

Model overview

Scrollable.
Vehicle Volkswagen Golf TSI Highline (2013 FY, Japan spec)
Suspension type Front MacPherson strut (with stabilizer bar)
Rear Multi-link (4-link / with stabilizer bar)
Model delivery format MSC Nastran bulk data format※
Correlation target frequency up to 400Hz (Supports road noise analysis)
Unit system Mass: kg / Length: mm / Force: mN
Model size Front Number of nodes:97,000 / Number of elements:62,000
Rear Number of nodes:90,000 / Number of elements:57,000
  • ※
    Delivery in Abaqus input data format is also available. Please contact us for details.

Tire FE model

Scrollable.
Brand PIRELLI
Model P7 225/45R17 91W (Tires installed on the target vehicle)
Specified inflation pressure 200kPa
Model delivery format MSC Nastran bulk data format
Correlation target frequency up to 400Hz (Supports road noise analysis)
Unit system Mass: kg / Length: mm / Force: mN
Tire modal model

Deliverables

  • Front suspension(Nastran bulk data)
  • Rear suspension(Nastran bulk data)
  • Tire + road wheel (modal model)
  • Experimental modal analysis data

Brochures

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