Mechanical engineeringCar diagnostics

Localization of noise sources in the cabin and underhood of cars

Inspection of operating components with the NAC-PA camera: search for sources of unusual sounds and noise affecting comfort in the cabin, followed by analysis of the recordings in Aura SVS.

What are the causes of noise-related defects?

≈38 thousand ₽Average cost of one warranty claim in the calculation model: parts, labor and overhead costs.

≈292 million rubles/yearWarranty claim costs for 7,645 noise and vibration related incidents per year.

≈459 million rubles/yearDowntime losses in the truck fleet model: three days of repairs and 20,000 rubles per day of downtime per call.

This is a hypothetical scenario based on case materials, not actual losses or verified savings at the surveyed company. Estimates apply to a hypothetical annual claims program; actual costs depend on the type of vehicle, number of defects, repair costs, and operating conditions.

About the project

Client: Car manufacturer
Industry: Mechanical engineering
Object: Car components and interior
The task: Localization of noise sources and signs of malfunctions
Equipment: NAC-PA
Software: Aura SVS

Task: to determine the source of an atypical sound

In automobile production, it was necessary to localize noise sources in the engine compartment and cabin. The obtained data was intended to assist specialists in maintenance and the development of noise reduction measures.

When a vehicle is running, the engine, auxiliary equipment, ventilation systems, and other components all produce sounds simultaneously. Whistling, rattling, pulsating, or unusual humming sounds can be difficult to pinpoint to a specific component by ear alone.

It was important not only to determine the location of the source, but also to preserve the acoustic data for detailed analysis after the tests.

Solution: acoustic map of operating units

A portable acoustic camera, NAC-PA, was used in conjunction with Aura SVS for the survey. The camera displayed the location of sound sources on an image of the vehicle, helping to identify areas for further inspection.

The saved container files contained video footage and acoustic data. This allowed for further study of the office recordings and the preparation of a report on the investigation's findings.

Выявление признаков неисправности клапанного механизма двигателя автомобиля — Identifying signs of a faulty car engine valve train

How was the examination conducted?

1 · Tests

Survey in operating modes

The vehicle components were examined with the engine running in situ, in motion, and on bench equipment.

2 · Localization

Search for noise sources

The acoustic map was used to determine the location of atypical sounds and sources that create discomfort in the cabin.

3 · Recording

Recording conditions and observations

The operator saved container files with acoustic data and added notes for later analysis.

4 · Analysis

Exploring Aura SVS Recordings

Specialists analyzed the preserved material and prepared a report for checking the components and further refinement of the design.

Result: areas for further testing have been identified

During the inspection, the sources of the unusual sounds were localized and their locations were recorded on the vehicle image. The images presented demonstrate the search for acoustic signs of a malfunction in the engine valve train area.

The saved recordings and notes allowed for further analysis in Aura SVS. The survey data helps specialists select components for inspection and evaluate possible measures to reduce cabin noise.

Where applicable

Sound visualization can be used in testing and inspecting other objects. Equipment and methods are selected based on the measurement conditions.

Aerospace industry

Localization of engine and fan noise on test benches, study of sound sources in the passenger cabin.

Shipbuilding and maritime transport

Search for sources of noise from engines, ventilation and mechanisms in engine rooms and cabins.

Rail transport and metro

Study of noise from traction equipment, bogies, doors and ventilation systems of wagons.

Production of household appliances and electronics

Localization of noise from motors, fans and pumps during testing and quality control of products.

Construction and architecture

Search for sources of noise from engineering equipment and areas where sound penetrates into premises.

Defense and security

Testing of equipment and localization of noise sources of power plants and auxiliary mechanisms.

Biology and Ecology

Localization of animal sounds, study of urban noise and its sources.

Equipment and Software

Acoustic camera for examinations and software for analyzing recordings and preparing reports.

NAC-PAA portable acoustic camera for locating sound sources and detecting signs of mechanical failure.Overview

Aura SVSSoftware for analyzing stored acoustic data and automated preparation of reports based on survey results.About the software

Need to localize the source of noise?

Tell us about the object and test modes – we’ll discuss the task and select a solution for the acoustic survey.