Industrial Noise Control. Design of Acoustic Enclosures, Attenuators, Louvers and HVAC Ducts Design

Code	AC-01
Days	3
PDH	21
Instructor	Mohammad Abdulqader
Certificate	Yes
Daily Timing	08:30 - 16:00 hrs
Course Brochure	Download Here

About This Course:

Industrial noise control receives increasing importance over the years due to strict noise regulations imposed by many nations worldwide. For example most of the sold diesel generators nowadays are equipped with acoustic enclosures (canopies), to reduce the noise coming from the generators to a level that is safe for human ears as per OSHA standards. One challenge here is that this noise is coming from different sources within the diesel generator and with different frequency spectrum and amplitudes. The other challenge is that when the enclosure is dropped over the diesel generator unit it should be designed to allow for the air to flow freely in order to cool the unit and supply the necessary air for combustion, this is not easy as you have to reduce the noise and at the same time allow the air to flow without causing loss of pressure across the enclosure. This course will explain the sound engineering background required for this ideal case problem and then it will cover the noise criteria, noise absorption materials and criteria to select which material. Then the course will talk about the design of enclosure walls to meet the noise criteria, select the right exhaust silencing, design the rectangular sound attenuators and acoustic louvers to achieve the noise attenuation and maintain the low pressure drop. The diesel generator noise is taken to be the study case of the course because it covers different noise and pressure drop problems. HVAC duct sound attenuation design as per ASHRAE and ARI standards will be also covered in this course with detailed calculation steps to achieve the specified NC or NR.

Course daily schedule:

Session-1	08:30 – 10:00 hrs
Coffee Break	10:00 – 10:15 hrs
Session-2	10:15 – 11:45 hrs
Coffee Break	11:45 – 12:00 hrs
Session-3	12:00 – 13:30 hrs
Lunch	13:30 – 14:30 hrs
Session-4	14:30 – 16:00 hrs

Course Contents:

Day 1

Diesel generators
Diesel engine specification sheet and parameters
Diesel generator three dimensional noise problem
Sound physics and international regulations
What is the Decibel (dB)
Sound octave band
Sound power (SWL)
Sound pressure (SPL)
SPL data of equipment
Sound A,B,C weightings
Sound propagation in free field and calculations
Sound inside rooms and reverberations
Sound directivity, absorption and reverberation time
Sound insulation (absorption, reflection and transmission)
Acoustic materials types
Acoustic materials parameters (alpha,TL,SRI,NRC)
Selection of suitable material for an applications

Day 2

Noise from inside rooms to outside and calculations
Acoustic calculation of walls and barriers
Enclosure wall design exercise
Rooms and enclosures ventilation and pressure drop calculation
Rectangular duct attenuators design (sound and pressure drop calculations)
Rectangular duct attenuator design exercise
Acoustic louvers types and design
Acoustic louvers design exercise (straight blades)
Exhaust noise design nd selection of muffler grade and muffler sizing
Exhaust silencing exercise for diesel generators
Acoustic performance of perforated sheets
HVAC duct design and sound calculations to ASHRAE standard

Day 3

Acoustic enclosure design workshop - design of walls, windows and doors
Acoustic enclosure design workshop - design of discharge rectangular attenuator
Acoustic enclosure design workshop - design of V-shaped acoustic louvers for enclosure inlet side
HVAC ssytem design and calculations workshop
Explain Acostix software modules and how to use it for designing and verifying industrial acoustical systems
Closing session: evaluation and issue certificates