Wheel testing rigs used for metro rolling stock generate high-intensity, continuous noise during load, impact, and endurance cycles. For Crest Test Systems, running these rigs at their Pune facility meant balancing two non-negotiable requirements: keeping noise levels within safe and compliant limits for the surrounding work area, and doing so without interrupting the precision and uptime the test cycles depend on. A standard shed or foam-lined room was never going to hold up under sustained mechanical impact noise of this kind. The equipment needed a purpose-engineered acoustic enclosure, not a generic soundproofing fix.
Why Testing Environments Need a Different Approach
Metro wheel testing isn’t like housing a DG set or a compressor. The noise profile includes sharp impact peaks alongside continuous rotational and mechanical noise, which means the enclosure has to absorb and block across a wider frequency range than a typical industrial application. On top of that, test labs can’t tolerate heat buildup around sensitive instrumentation, and technicians need frequent, unobstructed access to the rig without compromising the sealed acoustic envelope every time a door opens.
This is where most generic enclosures fail: they’re specified for average noise levels, not peak impact events, and their ventilation is sized for comfort rather than for a test rig’s actual thermal load.
What Ecotone Systems Delivered
Ecotone Systems engineered the enclosure around the rig’s real operating conditions rather than a catalogue template:
- Layered composite panels combining a dense outer skin with a high-density mineral wool or acoustic foam core, sized to handle both continuous and impact noise components.
- Sealed joints and gasketed access points to prevent the small air gaps that typically undo a large share of an enclosure’s rated performance.
- Engineered ventilation with lined, baffled air paths calculated for the rig’s actual heat output, so noise couldn’t leak through a straight duct run while still keeping internal temperatures within safe operating limits.
- Vision panels and accessible doors so operators could monitor test cycles and reach the equipment without repeatedly breaking the acoustic seal.
- AutoCAD-based assembly drawings, ensuring the enclosure was erected on-site exactly as designed, with no rework on sealing or ventilation after installation.
The Outcome
The enclosure delivered by Ecotone Systems met the required noise reduction target on first test, with no follow-up corrections needed to the door seals or ventilation path — the two areas where most enclosures run into trouble after commissioning. Testing operations at the Crest Test Systems facility have continued without interruption, and noise from the wheel testing process no longer extends beyond the enclosure into the surrounding work area.
The Takeaway
Testing environments like this are a good reminder that an acoustic enclosure is only as good as its weakest detail — a duct, a door seal, or a vibration path. Specifying for the equipment’s actual noise and heat profile, rather than a standard template, is what determines whether an enclosure performs on day one and still performs eighteen months later. It’s the same engineering discipline Ecotone Systems applies across every enclosure it builds, from DG sets and compressors to specialised testing rigs like this one.
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