Engineer Noise and Vibration case studies
Engineer Noise and Vibration · Put your knowledge to work in context.
The Engineer Noise and Vibration credential is a professional certification for engineers and technical specialists who measure, predict, and control sound and vibration across occupational, environmental, and product contexts. Candidates typically work in acoustics consulting, building services, industrial hygiene, manufacturing, transport, or environmental permitting, and want independent evidence that they can apply acoustic and vibration theory to real problems. The Engineer Noise and Vibration case studies are 5 cases and about 4,144 words.
1A 40 Hz drone that passes the dB(A) permit limit
You are engaged by a residents' group in a mid-rise apartment building. Since the neighbouring cold-store upgraded its refrigeration plant eighteen months ago, occupants of two flats report a constant 'pressure in the ears' and four to five awakenings a night.
835 words, about 4 min2Dosimetry, a recordable shift and a worker who removes his plugs
You are reviewing exposure data for a metal fabrication shop. A dosimeter worn by a press operator over a full shift logged 3.0 h at 92 dB(A), 2.0 h at 88 dB(A), 1.5 h at 95 dB(A) near the guillotine, and 1.5 h at 82 dB(A) in the office, with the balance of the eight-hour shift in a quiet crib room.
844 words, about 4 min3A waste-transfer station report that subtracts its own penalties
A waste-transfer station is proposed on a light-industrial lot 140 m from the nearest dwellings and 60 m from a residential care home. The developer's acoustic report predicts LAeq,night of 53 dB(A) at the nearest facade from fixed plant and reversing vehicles, against a night criterion of 45 dB(A).
832 words, about 4 min4Rooftop chiller, 31.5 Hz, and a rigidly mounted rail
A rooftop air-cooled chiller serving a 12-storey apartment building sits on steel rails above the top-floor penthouse. Since commissioning, the occupants report a continuous low 'drone' and say the floor and bed frame hum.
830 words, about 4 min5Night-time rail vibration: fourth-power aggregation and a request to keep it simple
A new light-rail line will run in tunnel beneath a residential street. The proponent's consultant reports night-time vibration at a ground-floor flat as VDV 0.13 m/s^1.75 (Wb, vertical) and concludes no mitigation is needed, because it falls inside the BS 6472-1 'low probability of adverse comment' range of 0.1-0.2 for residential at night.
803 words, about 4 min