When developing quieter products and conducting acoustic validation, the credibility of noise measurement data largely depends on whether the test environment replicates real operating conditions. The semi-anechoic chamber is a widely adopted acoustic laboratory in industrial sectors. Unlike a fully anechoic chamber with sound absorption on all six surfaces, it is constructed with high-performance sound-absorbing wedges on five surfaces, while the floor remains a rigid reflective plane. This forms a standard semi-free acoustic field, which matches the working condition of most electromechanical equipment placed on hard ground, making it a popular choice for automotive, home appliance and general machinery research and testing.

Built with a room-in-room floating isolation structure, the chamber blocks vibration transmission from the foundation and uses sound insulation walls together with sealed acoustic doors to limit disturbance from ambient noise. The absorbing wedges on walls and ceiling are optimised through acoustic simulation, offering reliable sound absorption above the designed cutoff frequency. Its acoustic performance can be constructed and verified in line with international standards including ISO 3745, covering background noise, free-field deviation and other core parameters to support R&D tuning, batch sampling and certification testing.

New energy vehicle manufacturers utilise semi-anechoic chambers for NVH evaluation of traction motors, reducers and air-conditioning assemblies. Under controlled conditions, engineers simulate various load and speed settings to capture electromagnetic noise and mechanical irregular sound, and compare the noise reduction performance of different damping and acoustic materials to refine vehicle quietness. Home appliance brands carry out noise assessment for outdoor air conditioning units, refrigerator compressors, washing machines and fans, identifying acoustic risks before product launch and lowering after-sales complaints. Pump, servo motor and construction machinery suppliers also conduct sound power level measurement to evaluate noise emission under outdoor operating scenarios. Universities and accredited testing institutes deploy these chambers for microphone calibration, acoustic research and noise reduction material assessment.

Compared with fully anechoic chambers, semi-anechoic chambers support heavier test samples and simplify loading and installation for large equipment, bringing more balanced construction lead time and investment. Customised layouts are available according to product size, test frequency range and site constraints, together with viewing windows, cable feedthroughs and ventilated silencing systems. We deliver end-to-end services including site survey, design, fabrication, on-site installation, commissioning and training, alongside regular calibration support to maintain stable acoustic performance over the service life and support continuous product acoustic improvement.