Articles tagged “worked example”
14 articles covering worked example in acoustic engineering and building design.
How to Calculate RT60 for an Open-Plan Office — Full Worked Example
Step-by-step Sabine RT60 calculation for a 300 m² open-plan office. Every surface area, absorption coefficient, and octave-band sum shown — from bare slab to treated space.
How to Calculate STI for a Classroom — IEC 60268-16 Step-by-Step
Full STI calculation for a 200 m³ classroom. Derive RT60 via Sabine, then compute speech transmission index using the modulation transfer function method per IEC 60268-16:2020.
Ceiling Absorption Calculation: Octave-Band RT60 Prediction for 3 Ceiling Types
Same 200 m³ room, three ceiling systems: 15mm mineral fibre, 25mm perforated metal with backing, and 50mm exposed mineral wool. Full Sabine RT60 for each at 125–4000 Hz.
Concert Hall RT60 Design: 1,800-Seat Auditorium Worked Example
Design an 1,800-seat concert hall for RT60 2.0 s (occupied). Full octave-band Sabine calculation, audience absorption, occupied vs unoccupied comparison, and EDT estimation.
Impact Noise Floor Build-Up: ΔLw Improvement Calculation — ISO 717-2
Start with bare 150mm concrete slab (L'nT,w 78 dB). Add resilient mat, screed, and carpet step by step. Calculate ΔLw at each stage per ISO 717-2 with full IIC ratings.
NC Curve Calculation from Octave-Band Measurements — Step-by-Step
Determine the NC rating from a set of octave-band background noise measurements. Step-by-step tangent curve method, controlling frequency identification, and RC Mark II comparison.
Facade Noise Break-In Calculation: External Noise to Internal Level — ISO 12354-3
70 dBA road traffic at facade: calculate internal noise through composite wall, window, and ventilator using ISO 12354-3. Area-weighted Rw and BS 8233 compliance check.
Outdoor Noise Propagation Calculation: ISO 9613-2 Step-by-Step Example
Industrial source at 200m: calculate receiver level using ISO 9613-2. Geometrical divergence, atmospheric absorption, ground effect, and barrier attenuation — full octave-band worked example.
Lab STC to Field FSTC: How to Predict Real-World Sound Insulation Performance
Take a lab STC 55 partition and predict field FSTC accounting for flanking paths: floor, ceiling plenum, ductwork, and outlets. Full ISO 15712 worked example.
Restaurant Acoustic Treatment Calculation — From 2.1 s RT60 to Comfortable Dining
250 m² restaurant with 4 m ceilings and RT60 = 2.1 s. Calculate the absorption deficit and design a treatment scheme to reach 0.8 s — with full octave-band before/after comparison.
Sabine vs Eyring: Same Room, Different Answers — Worked Comparison
Calculate RT60 with both Sabine and Eyring equations for the same recording studio. See exactly where the results diverge, why, and when the 28% difference matters for design decisions.
Sound Masking System Design: Spectrum, Level, and Coverage Calculation
Design a sound masking system for a 500 m² open office from scratch: masking spectrum, required level, speaker spacing, and before/after Articulation Index.
Composite STC Calculation: Wall + Door + Window — Full Worked Example
Calculate composite STC for an office wall with a door and window. See how an STC 28 door drags down an STC 55 wall — with full area-weighted transmission loss at every 1/3 octave band.
WELL v2 Feature 74 Compliance: Full Acoustic Calculation for a 3-Storey Office
Full WELL v2 Feature 74 compliance check for a 3-storey office: Sound Mapping (L01), STC requirements (L03), Background Noise (L05), and RT60 (L07) with detailed calculations.