Why Use Acoustic Simulation When Planning a Demanding Laboratory?

When a business plans an acoustic laboratory, several proposals may contain detailed layouts and performance targets. The practical question is whether a design addresses the intended tests. Where a project has specific requirements, such as low-frequency sound-field performance, acoustic simulation can provide analysis before construction. It helps customers compare designs, rather than simply comparing room areas or prices.

Lessent combines theoretical calculation, acoustic simulation and engineering implementation to support the design of acoustic test environments. Customers do not need to learn how to build a model first, but they should be able to understand the question being analysed, the choices supported by the results and the conditions that remain to be confirmed.

Define the products and positions to be tested

Before analysis begins, the customer can list the test products' dimensions and placement, the frequency range of interest, planned measurement positions and supporting facilities within the test space. The designer can then define the subject and scope of the analysis.

For a low-frequency free-field requirement, stating that the room should “reach 50 Hz” is not enough. The discussion should also establish where tests are planned, how large a test region is needed and whether those conditions are included in the analysis. This is about expressing the construction requirements clearly, not prescribing the same frequency target for every laboratory.

Simulation then has specific questions to answer. Does a candidate layout suit the planned test arrangement? How do calculated results in the region of interest change when the acoustic treatment design changes? Which positions or operating conditions have not been analysed? These questions should be settled before modelling, rather than inferred from a plot afterwards.

Compare proposals using clearly stated conditions

When comparing room layouts or acoustic treatment designs, customers can ask the designer to identify which conditions were held constant and what actually changed. For example, were the same source settings, observation positions and frequency range used? What information supports the material acoustic parameters?

A conspicuous colour change in a plot does not, by itself, establish that a design better suits the customer. Comparisons should also check the legend scale, displayed positions and quantity of interest, so that presentation differences are not mistaken for design effects.

Room-acoustics research by researchers at the Technical University of Denmark identifies the influence of uncertainty in input data and boundary conditions on simulation results.[1] Customers therefore have reason to ask which parameters come from established information, which are current assumptions and whether changed assumptions would require further analysis. Conclusions should be delivered together with these conditions.

Make the deliverables usable by people who do not build models

Customers can include the following in the agreed scope of the analysis:

First, the question and coverage. State what is being assessed, the frequency range and positions covered, and what has not been included.

Second, the model and inputs. Provide an understandable layout drawing and explain the sources of key dimensions, material acoustic parameters and source settings. Identify assumptions still awaiting confirmation.

Third, results with an explanation. Figures should include units, legends, frequencies and position labels. When comparing designs, explain what the differences mean for the customer's choice, rather than delivering colour plots alone.

Fourth, design conclusions and outstanding actions. Identify the design choices supported by the analysis, the information still needed and whether subsequent design changes would require the calculations to be updated.

These are suggested deliverables for clearer customer review and communication. Their depth should match the project objectives and agreed scope. They turn “Was a simulation performed?” into the more useful question, “What decision can this analysis help me make?”

Connecting Lessent's analysis capability with the design

Acoustic simulation formed an important part of the proposal work for Lessent's recently delivered acoustic laboratory project for Dahua in Hangzhou. Lessent can provide the theoretical calculation process and simulation results for a 50 Hz free sound field. For customers with similar requirements, this capability gives the discussion of the target sound field a calculation basis and allows a proposal to be reviewed through its analysis conditions and design conclusions.

Before construction, prepare the product and test-task list, site conditions and target requirements, then ask the designer to explain how the simulation addresses them. The completed facility's acoustic performance still needs verification using agreed methods and conditions; ISO 26101-1:2021 provides test methods for qualifying free-field environments.[2]

References
[1] Thydal, T.; Pind, F.; Jeong, C.-H.; Engsig-Karup, A. P. Experimental validation and uncertainty quantification in wave-based computational room acoustics. Applied Acoustics, 178 (2021), 107939. Public research record at the Technical University of Denmark.
https://orbit.dtu.dk/en/publications/experimental-validation-and-uncertainty-quantification-in-wave-ba/
[2] ISO 26101-1:2021, Acoustics — Test methods for the qualification of the acoustic environment — Part 1: Qualification of free-field environments. First edition, 2021; reviewed and confirmed in 2026.
https://www.iso.org/standard/80877.html