- Community noise assessment and noise impact study
- Noise evaluation of potential building sites. The results of this evaluation indicate the degree of noise isolation which should be provided by the building envelope on a particular site.
- Transportation noise control.
- Industrial noise troubleshooting.
- Mining noise assessment.
- Commercial noise study.
- Acoustical planning of sites and buildings.
- Sound isolation in residential, commercial, industrial and institutional buildings; specification of construction materials and methods to meet the targeted acoustical performance.
- Room geometry and acoustical treatment for music rehearsal halls, studios (film, television, sound recording), auditoriums, gymnasiums, dance studios, conference rooms, cinemas, concert halls and theaters
- Preparation of design, construction drawings and specifications for spaces in which acoustics are of primary importance
- Noise and vibration control for mechanical and electrical equipment.
- Noise evaluation of the working environment in industries with regards to occupational hearing loss. Recommendations of noise control measures to comply with regulations and bylaws.
LOUD NOISE TROUBLESHOOTING
- Sound reduction from both external and internal sources
- Noise Control in floor-ceiling assemblies in multiple story buildings
- Vibration control in buildings and manufacturing
- Bringing industrial and commercial sites to comply with noise regulations
Building Site Study
Special sound isolation (soundproofing) measures for exterior walls, windows, doors and roofs often are required for buildings that are exposed to heavy traffic, or are located near trains, airports, or noisy industrial and loud commercial sites. A Acoustics determines sound isolation requirements by calculating the difference between outside and inside building noise levels. We then make recommendations and specify modifications to reduce the effects of noise (sound attenuation). In addition, we evaluate site-generated exterior noise resulting from such factors as rooftop air conditioning systems, cooling tower’s noise, traffic noise, and recommend noise solutions that mitigate noise impacts to the surrounding community.
Architectural Acoustics and Interior Sound Study
The Uniform Building Code (UBC) requires architects to meet minimum acoustical standards for the construction of partitions and floors. However, property owners frequently discover that building codes for both multi-family residences and office complexes are inadequate to effectively isolate noise and vibration from one unit to the next or within individual units.
Because correcting code deficiencies in a completed structure can require costly and disruptive structural redesign, AAcoustics recommends and performs Interior Sound Studies before construction begins. By reviewing plans and specifications, we can pinpoint potential acoustical problem areas and recommend effective redesigns that ensure noise and vibration will be minimized
Room Acoustics Study
When not properly designing, large halls, theaters, churches, and meeting rooms can exhibit a variety of acoustical problems, including echoing, booming, and high ambient noise levels. Many of these problems can be predicted and measured through reverberation time (RT60) studies, which establish sound decay time in an enclosed room. Desirable reverberation time (RT60) allows frequency components to grow and decay at rates that support high speech intelligibility and the rich enjoyment of music.
A Acoustics performs Room Acoustics Studies that identify and quantify reverberation time problems, and recommends appropriate structural modifications to obtain optimal sound absorption, sound reflection, and sound diffusion rates.
Central HVAC System Noise Reduction
When a typical Heating, Ventilation, and Air Conditioning (HVAC) system is well designed, the HVAC noises that ultimately reach living and working quarters are made up of a) low-frequency fan noise, b) mid-frequency airflow noise or turbulence-generated noise caused by a variety of sources within the ductwork system, and c) high-frequency damper and diffuse noises.
A Acoustics isolate all sources of ductwork noise and radiated sound, calculates the acoustical power of the noisy fan, and determines required duct attenuation. We then analyze the results of these evaluations, and establish performance limits based on Noise Criteria (NC), room criteria (RC), with noise rating curves ratings. Finally, we recommend solutions for insulating the building and the equipment, as well as modifying the equipment so that the remaining noise falls within acceptable noise tolerance standards.
Local HVAC System Noise Reduction
Some facilities-such as computer rooms, hospitals, and laboratories-are built with independent Heating, Ventilation, and Air Conditioning (HVAC) systems. Components of these local HVAC systems can produce undesirable noise levels that significantly impact the overall work environment as well as violate occupational noise exposure of OSHA requirements. To assist in controlling noise generated by local HVAC systems, A Acoustics identifies and analyzes the source of the noise problem. We then recommend solutions to reduce the impact of the noise level of the offending component. A Acoustics also can provide cost- estimates for implementing the solutions, and perform follow-up studies to ensure the desired results are attained
Mechanical Room Noise Reduction
To assist in the control of noise in both proposed and existing mechanical rooms, A Acoustics first collects and calculates all relevant data on a) the noise-generating equipment contained within the mechanical room, b) the noise isolation and absorption capabilities of the mechanical room itself, and c) the impact of noise from the mechanical room on any surrounding rooms. We then recommend modifications to mitigate the impact of the noise, taking into consideration the characteristics of the structure, local codes, equipment life cycle, available resources, and cost/benefit ratios. Following implementation of the recommendations, A Acoustics can analyze, measure, evaluate, and report on the effectiveness of the modifications to ensure the desired sound level are achieved.
All structures have multiple frequencies of vibration resonance that result from factors related to their construction. Such factors include design, type of material(s), and building mass, and comprise the vibration characteristics of a specific structure. Because the natural frequencies of floors, walls, beams, and columns typically range from 10 to 60 Hz, these components can be excited into greater vibrational magnitude when located near equipment operating in a matching frequency range. A Acoustics performs Vibration Studies to identify and quantify the vibration characteristics of specific structures and structural components. We then specify methods for isolating offending mechanical equipment in order to minimize the vibration problem
Sound and Vibration Studies
Environmental noise and vibration can originate either from internal mechanical equipments or from a variety of outside sources such as transformers, vehicles, cooling towers, fans, motor-driven equipment, and a host of industrial machinery and processes. In addition to disturbing people, sound and vibration also can adversely impact certain types of processing equipment. For example, while humans can detect floor vibration exceeding a Root Mean Square (RMS) velocity of approximately 125 microns per second, certain equipment exhibits vibration-related malfunction if floor vibration exceeds 6.25 microns per second. Moreover, noise transmission is affected by three major environmental influences: distance, atmospheric conditions, and terrain/vegetation. When existing environmental sound and vibration adversely influence the success of a project, A Acoustics performs Environmental Sound and Vibration studies to evaluate the impact of these factors prior to construction. A complete Environmental Sound and Vibration Study contain the following three elements. When a comprehensive study is not required, we will perform any of the elements of a complete Environmental Sound and Vibration Study individually.
Noise Prediction Study
Traffic noise calculations account for traffic flow patterns, speed limits, terrain, distance from the road, and the car/truck ratio. Equipment noise is either measured or estimated, based on known sources for a specific type of equipment. A Acoustics predict sound levels from environmental sources, such as outdoor equipment and traffic. We then evaluate the predicted sound levels for compatibility with the proposed use and for compliance with all existing land use restrictions and federal, state and local regulations. Where required, we also make recommendations for noise attenuation.
Ambient Noise Study
To establish the ambient noise levels for a proposed project, A Acoustics measures and assesses the existing noise levels, comparing them with applicable land use restrictions and federal, state, and local noise regulations. Based on these analyses, A Acoustics predict how ambient conditions will affect the proposed project. We also recommend methods for reducing noise levels to comply with all pertinent regulations.
Excessive noise can seriously diminish the quality of life in neighborhoods and communities. A Acoustics measures, analyzes, and compares the impact of emitted sound against applicable state and local regulations. Where violations occur, we recommend strategies for limiting noise emissions. A Acoustics also performs follow-up studies to ensure the desired results are attained