NEBB S&V CP case studies
NEBB S&V CP · Put your knowledge to work in context.
NEBB's Sound and Vibration Measurement (S&V) certification is issued by NEBB, the international certifying association for firms and individuals who deliver high-performance building systems, established in 1971. S&V is one of eight NEBB certification disciplines, and it is offered in two tracks: Sound Measurement and Vibration Measurement. The NEBB S&V CP case studies are 5 cases and about 2,758 words.
1AHU Noise Survey in an Open-Plan Office
You are conducting a sound survey in an open-plan office at 1.5 m from a new air-handling unit. The unit cycles on and off every 5 minutes; your 30 s A-weighted Leq was taken during steady operation.
593 words, about 3 min2Pump Bearing Alarm After Sensor Change
A 75 kW horizontal centrifugal pump, driven at 2970 rpm through a flexible coupling, has a new vibration alarm. The pump drive-end bearing horizontal reading is 4.8 mm/s RMS over 10–1000 Hz, up from a baseline of 2.1 mm/s.
539 words, about 3 min3Fan Sound Power in a Non-Ideal Test Room
You must determine the octave-band sound power level of a 1.5 m diameter axial fan for a submittal. The only available room is a hard-surfaced mechanical room 12 m by 9 m by 4.5 m (volume 486 m³).
544 words, about 3 min4Subway Vibration Complaint in a Laboratory
Occupants of a first-floor research laboratory above a new subway line complain of vertical floor vibration at 16 Hz and of dust moving on optical benches. A triaxial accelerometer bonded to the concrete floor at the bench location gives a 16 Hz one-third-octave rms acceleration of 0.008 m/s².
518 words, about 3 min5Field Airborne Sound Insulation Failure in a Hotel
A hotel project specifies STC 55 for party walls between guest rooms. You perform a field airborne sound insulation test per ASTM E336.
564 words, about 3 min