VALEO Spain has commissioned INERCO Acoustic to design, manufacture and install a semi-anechoic chamber (with an anechoic area) within its factory to allow for the measurement of acoustic output from their engines from the automotive sector.
Semi-anechoic chambers reproduce “free field” conditions, ie; without reflections from walls or the ceiling, only from the ground, such as when we are in an environment that has a very low level of background noise allowing the measurement of engine noise without any external noise contamination or interference.
The sound insulation is designed using a "box in box" system that allows for high levels of acoustic insulation and low levels of vibration. This technology consists of the construction of a floating concrete structure supported on resilient elastic pads - INACUSTIC SA300 / CT, an acoustically insulated roof support - TCH-72 joined to the acoustically insulated floor and ceiling supports - TD-63 and TD-57; There is also a naturally integrated ventilation system - INASIN acoustic baffles, acoustic grommets, a large INADOOR acoustic door and an LED lighting system. The acoustic treatment comprises of polyurethane foam wedges 34 cm in length (roof, walls and floor in the anechoic area) and a ceramic floor in the semi-anechoic area.
The final characteristics of the semi-anechoic chamber are:
These features allow VALEO to acoustically characterise their engines according to the following regulations: