AcouS STING® is the software follom-up of AcouS STIFF®. This allows for a long time to assess the sound reduction index of single and complex walls and has naturally been used to calculate the sound reduction index of complex floors.

Regarding the latter, the noise level of shock is the second criterion to assess the acoustic performance of a floor.

Training courses are held on an inter-company basis in Toulouse and Paris, and also on an intra-company basis on request, throughout France and abroad.

Noise impact prediction software

AcouS STING® software is a simple and adaptable tool that allows you to :

  • Déterminer le niveau de bruit d’impact d’un plancher simple et complexe
  • Assist in new product development,
  • Optimize measurement campaigns in a laboratory,
  • Appreciate the performance of a floor covering,
  • Extrapolate the performance conventional structures,
  • Forecast unconventional structures and their optimization,
  • Understand the acoustic behavior of a floor.
  • Impact noise level of a simple and complex floor

The results are presented as graphs and/or tables showing the overall values in accordance with ISO 717-2.

Suspended ceiling simulation


Today AcouS STING® allows you to assess the level of impact noise floor complexes and by extension improve the noise impact of coatings or false ceilings associated with these floor complexes.

The level of noise impact of a floor can be measured in a laboratory specially designed for this purpose (cutting of cell transmission and reception, shapes and sizes of cells...).

However, this criterion depends on a very large number of parameters : thickness, density, stiffness of the constituent materials,...

Under these conditions, the number of walls to be tested is infinite and a uniquely experimental approach, by the time and cost it represents, can not suffice.

Predicting appears to be an essential complementary approach.

Far from being mutually exclusive, the two approaches - laboratory measurement and predictive calculation - are complementary and essential to each other:

  • Both approaches, laboratory measurement and calculation of estimates, far from being exclusive are complementary and necessary to one and the other
  • The experimental approach can be considered only as the number of cases to be tested, but the models simulation to be validated should be on individual cases properly chosen, of a comparison with experimental values.

The is a simulation tool the level and improvement of impact noise.

The types of walls which can be calculated by AcouS STING® software

AcouS STIFF® software can perform calculations and projected levels of improvement in impact noise :

  • Heavy homogeneous floors,
  • Floating screeds,
  • Tiles on under layers,
  • Flexible flooring,
  • Suspended ceilings.

Homogeneous tiles

The model is based on an energy balance sheet of the slab

The energy injected by the hammer is distributed between the radiated energy and the dissipated energy.

The radiated energy is mainly controlled by the coefficient of radiation. The coefficient used is similar to that usually used finite thin plate and thus takes into account the dimensions of the plate and in particular the thickness which controls the critical frequency.

The dissipated energy is controlled by the coefficient of total losses, which included losses by internal viscosity and peripheral losses.

The injected energy is calculated from the characteristics of the hammer and takes into account the elasticity of the shock upon contact allowing a better approximation of the spectral density.

Temporal shape of the impact depending on the coating

Floating screed

The model is a mass-spring type. This calculates the frequency response of the filter in order to evaluate the relationship between the applied force on the bare floor and the applied force across the floating system. This filter is mainly driven by the resonant frequency by the radio of impedance place / hammer and the loss factor. You deduce the ΔL of the relationship between these two forces.

Floating screed

Soft floors

This model is based on the same principle as the previous one with the difference that the mass of the system is also flexible. We must therefore evaluate differently the force applied by the hammer on the coating. We therefore calculate the force applied according to the temporal evolution of the contact and the relative deformation of each element of the contact.

Soft floor

AcouS STING® examples


  • Full slab
  • 14 cm reinforced concrete slab support.
  • Calculation : LNA = 81, LNW = 76
  • Measure n°9 : LNA = 81, LNW = 77


  • Heated floor
  • Topping slab with 4 cm pads on a reinforced concrete slab support of 14 cm.
  • Calculation : LNA = 70, LNW = 61
  • Measure : LNA = 71, LNW = 63


  • Flexible floor
  • Covering of flexible flooring with PVC foam on upside to a total thickness of 3 mm.
  • Calculation : ΔLNA = 9, ΔLNW = 13
  • Measure : ΔLNA = 11, ΔLNW = 14


  • Support slab with suspended ceiling
  • 14 cm support reinforced concrete slab with suspended ceiling consisting of 75 mineral wool, 25 mm air gap and two BA13.
  • Calculation : LNA = 57, LNW = 52
  • Measure : LNA = 57, LNW = 51

Training objectives : :

  • Provide participants with the basic knowledge to understand the acoustic behavior of a floor and to highlight the influence of parameters which can be uses to optimize a piece of work.
  • Mastering the use of AcouS STING® software.


People concerned : :

The course is valuable for engineers who design or prescribe the walls, including :

  • the engineers of studies who propose solutions for constructive systems,
  • technical sales people responsible for prescribing a work derived from a system catalog,
  • the engineers of R&D department responsible for the development of a wall or a mounting system, or manufacturing technology.


For further information, please contact Marion Lorin

AcouS STING® - Software used to predict the level of impact noise

Diag LEXD® - Prevention of hearing risks connected to the exposure of noise

AcouS STING® - Software used to predict the level of impact noise

AcouS STIFF® - Acoustic Software Sound Transmission Index Full Forecast

AcouS PROPA® - Software for modeling acoustic propagation in premises and outside

Related services

For all our software, a complete range of products and services is at your disposal :

Maintenance contract

This maintenance contract provides among other things : the maintenance of the software and the dongle, the delivery of software updates for free for holders of the maintenance contract, phone support, special discounts on other software


Each year a new version containing additions or changes in the software is available.

Training and seminars

We regularly organize inter-company and intra-company training courses on the use of the software.

Day of information and exchange

Each year and each software program, at least one day of information and discussion is held with the users of such software.

Calculations on demand service

We can do calculations of acoustic simulations on request with the use of our software. You can avail of these services free or at very favorable terms for an annual fee.

For more information, please contact us

You will find below answers to some questions you ask and which we hope will give you the information you seek.

In the AcouS STING® there are two types of coatings : flexible coating such as PVC, linoleum, carpet, rubber... and hard floating surface coating such as floating screeds, underfloor heating, tile on mini screed, floating floors...

Yes, here are some examples of the tiles under the supports and associated layers that the software takes into account :

Example 1 : solid concrete slab with polyethylene

Example 2 : honeycomb slab with polyurethane

Example 3 : the solid wood floor with the textile fibers

Example 4 : the floor plate with bitumen + fibers


We can calculate the impact noise level of a CLT-type solid floor. It is not possible to calculate the impact noise level of a lightweight OSB type floor on joists. But a test report can be used instead in the ΔL+Ln+ΔR calculations.

Regarding this question, several points:

  • AcouS STIFF®: sound reduction index
    • If you have an R test report for a false floor on concrete, you can readjust it (preferably using the deltaR to more easily understand the separation factor)
    • Then you can recreate a double wall by integrating an OSB wooden floor instead of the concrete floor while keeping all the other parameters.
  • AcouS STING®: impact sound level
    • You can readjust a false floor deltaL on concrete floor from the floating covering module that you can reinject on any so-called inert floor (concrete, slabs, hollow core slab, pre-slab, etc.). On the other hand, you will not be able to put it on an OSB wooden floor (even taking the latter from an experimental value because it cannot be simulated in Ln for the moment)

AcouS STING assumes an inert support floor, which is not really the case for CLT with a floating screed, as the mass of the screed is greater than the mass of the floor. So there are two ways of adjusting:

- or bare CLT + floating floor covering, adjusting the Young's modulus of the underlay to calibrate the test report (from memory, this works well with screed + domisol).

- or by considering an equivalent floor, a single solid slab wall of total CLT+slab thickness and equivalent density to obtain the right mass per unit area with Young's modulus = CLT Young's modulus and surface Young's modulus close to the concrete surface Young's modulus (2e10Pa). From memory, this works well for CLT+ASSOUR, but the loss factor can be reduced by the presence of the underlay.






Les équipes de Gamba sont à votre écoute. Envoyez-nous un message avec le formulaire ci-dessous ou appelez nous.

Les fondamentaux et l'optimisation de AcouS STING®

Prochaines sessions
Lieu de formation
Company *
Adresse *
Code postal *
Ville *
Phone *
Nom et prénom du responsable formation
E-mail du responsable formation *
Activité de l'entreprise *
Merci de nous indiquer par quel moyen vous avez connu notre centre

Got a question? Gamba has the answer.


You can also contact us directly by telephone on