What are the stages in an acoustic diagnosis?

Faced with growing sensitivity to the quality of environmental noise, controlling noise pollution has become a technical, regulatory and health issue. In sectors such as industry, aeronautics, automobiles, railways and construction, noise and vibration management has become essential. Acoustic diagnostics play a central role in identifying, quantifying and effectively correcting sources of noise disturbance, whether structural or environmental.

This rigorous technical process is based on a series of analyses and numerical simulations designed to characterize the acoustic behavior of a product or site. Thanks to its expertise, SIM Engineering, an independent design office, supports its customers in carrying out tailor-made, high value-added acoustic diagnostics.

Typology of noise analyzed in an acoustic diagnosis

Acoustic diagnostics can cover several types of noise nuisance, depending on the origin of the noise and its mode of propagation. This classification is essential for adapting measurement tools and corrective solutions to each situation:

• Airborne noise, both indoors (voices, office equipment, HVAC systems) and outdoors (road, air and industrial traffic).
• Solid-borne noise, transmitted by mechanical or built structures: these acoustic vibrations travel through materials (floors, partitions, frames, etc.).
• Noise from technical equipment such as fans, electric motors, compressors or machine tools, often a source of continuous or impulsive nuisance.
• Reverberations and echoes, which impair intelligibility in enclosed spaces (meeting rooms, cabins, cockpits) and can lead to hearing fatigue.

Precise identification of these sound sources enables SIM Engineering to propose tailor-made solutions, adapted to the configuration of the site or the design of the equipment. Thanks to a detailed acoustic analysis, it is possible to take effective action on insulation, absorption or vibration treatment.

SIM Engineering’s expertise in acoustic diagnostics

A rigorous, technical approach

At SIM Engineering, each acoustic diagnosis is carried out according to a proven methodology, combining physical measurements, numerical modeling and, if necessary, vibration analysis. Our engineers use state-of-the-art acoustic simulation tools to draw up a precise assessment of the noise phenomena observed.

Mastery of simulation and measurement tools

The team mobilizes advanced skills in 3D measurements and simulations. These techniques enable us to simulate noise propagation, assess vibration transmission and determine critical sound radiation zones. By combining these analyses with in situ measurements, our experts can validate calculation hypotheses and refine improvement recommendations.

Stages of an acoustic diagnosis: regulatory framework and 5-step approach

Regulatory framework for acoustic diagnosis

Acoustic diagnostics are governed by precise standards. Depending on the sector, several standards may apply: standard NF S31-080, decree on noise from land transport infrastructures, acoustic regulations (NRA) for new buildings, or European directives for industrial environments. SIM Engineering takes care to integrate these requirements right from the analysis phase.

Acoustic diagnosis stages :

1. Needs assessment and project context

The first step is to fully understand the context: nature of the equipment or site, regulatory constraints (ISO standards, noise decree, prefectoral decree, etc.), customer expectations and diagnostic objectives. This phase enables us to define the relevant acoustic performance indicators.

2. Acoustic measurement campaign

Our engineers carry out on-site sound and/or vibration measurements. This includes sound pressure levels, frequency spectra, reverberation times or vibrations. These measurements can be carried out under normal operating conditions or in specific configurations.

3. Acoustic modeling and numerical simulation

Using acoustic simulation software, SIM Engineering models the environment or component to predict acoustic behavior, locate dominant noise sources, and simulate optimization scenarios.

4. Analysis of results and diagnosis

The results of simulations and measurements are compared with the initial objectives. This stage enables us to rank the sources of noise pollution and assess their overall impact. Concrete recommendations are then proposed, ranging from geometric modifications to the addition of insulation or passive/active treatments.

5. Technical report and customer support

A full report is delivered to the customer, including analysis results, models, findings and possible solutions. SIM Engineering supports its customers in implementing the recommendations, and can also provide post-diagnostic follow-up.

Concrete applications

Acoustic diagnostics are used in a wide range of applications:

• Industry: noise characterization of mechanical equipment, acoustic comfort management in production buildings, regulatory measures for the environment or personnel protection, etc.
• Building: Treatment recommendations for offices, refectories, meeting rooms, accommodation, auditoriums, ….

These projects demonstrate the added value of the coupled measurement + digital simulation approach to improving design, compliance and comfort.

Why carry out acoustic diagnostics with SIM Engineering?

A global, scientific vision

When you choose SIM Engineering, you benefit from recognized expertise in acoustics, vibration engineering and numerical simulation. Our approach integrates both technical and regulatory aspects, for a complete, reliable and results-oriented diagnosis.

State-of-the-art tools and guaranteed confidentiality

We work with market-leading software tools and ensure total confidentiality of our customers’ data. We adhere to a strict quality charter, and each project benefits from personalized support.

Contact SIM Engineering for your acoustic project

Do you have a specific acoustic diagnostic requirement? Whether it’s for a design project, compliance or product optimization, our teams are at your service.

Contact us for a personalized study.