Research
PCP has in house NVH R&D center having capability of total designing, simulation and development of components. To achieve our objective of emerging as a System Supplier of NVH products for automotive application, our R&D activities have been keyed towards the development of Products & Processes that exceed customer expectations & helps to meet our obligations towards Environment & Safety.

Concerted efforts of our R&D has helped in the localization of TPO laminated sheet locally in India resulting in saving of time & resources.

Development of Fire Retardent molded PUF has resulted into providing risk free engine compartment insulations for automotive industry.

Process & material changes in Felt based parts have helped us to reduce energy consumption in process resulting in the saving of resources and also dealing with Environmental issues of global warming.

The Approach
  • Achieve the required targets using SEA model and verify predicted values by experimental method as necessary
  • The SEA model and a hybrid model, if necessary, will be used to cover the entire frequency range of interest.
Generation
  • Vibration analysis
  • Absorption data
  • Airflow resistance data
  • Sound transmission loss data
  • Insertion loss data

Part Development
  • Proto
  • T0, C, D, Series Production

Math Data
  • Component Math Data (CAD Modeling)

Tooling
  • Proto or Series tooling as applicable / required

Component NVH Target Cascade Example NR to Component Targets


Component Level Analysis Structural Dash Panel
Component Level Analysis Pass-thru Analysis

Based on previous projects, noise transmission through passthru’s into cab is a significant noise path
Component NVH Target Cascade Dash Panel Buck Study
  • Dash & IP SEA Model extracted from full vehicle model
  • Pass-thru test data included in model
  • Design sensitivity study to identify maximum performance improvement.
  • Rank order pass-thru contribution to overall performance.
  • Identify most critical pass-thru’s requiring improvement
  • Use dash buck results in full vehicle level SEA model to determine reduction in SPL
Generation
Normal Incidence Sound
  • Absorption Test
  • Transmission loss
Acoustic Test - AFR
Airflow Resistance :
  • ASTM C522
  • ISO 9053
  • Rƒ = APA/U
  • Specific flow resistance
    (mks Rayls; Pa·sec/m)
Where
  • AP= Air Pressure difference across test sample, Pa
  • U = Volume flow rate of air through the test sample, m3/sec
  • A = Area of the test sample, m2
Acoustic Test - Ra

Random Incidence Sound
Absorption Test :
ASTM C423
ISO 354
Measure decay rate of the bare room and the room with the test sample.

The difference of the decay rates provide information on the absorption of the sample

Acoustical Study