Acoustical Consulting Services
Navcon engineers have a strong background in physics, mechanical design, digital data acquisition, noise and vibration. This combination of theory & application, analysis & test allows us to attack a wide variety of noise related projects. Following is a brief list of our general acoustical services:
Product Noise Testing - Navcon engineers conduct specification tests (sound pressure, sound power, acoustic intensity) in accordance with ANSI, ISO, MSHA/OSHA, Commercial/Military and other standards and guidelines. Navcon test instrumentation is calibrated in accordance with, and is traceable to the National Institute of Standards Technology (NIST), military (MIL-STD 45662) and manufacturer guidelines. The test instrumentation is also portable allowing us to conduct tests at customer facilities and at remote sites. Navcon has a reverberation chamber for small product testing and access to an off-site semi-anechoic chamber. We are currently constructing a 4,000 cubic foot semi-anechoic chamber at our Fullerton, CA laboratory which will be completed in the summer of '07.
Blast Noise & Heat Flux Testing - Navcon provides Blast Overpressure and Heat Flux measurement services for both commercial and military applications. The data is often used to assess the suitability of containment shelters and personnel injury when subjected to extreme pressure waves and temperature gradients. Navcon measurement systems can record blast overpressures greater than 185 dB (10 PSI) at sample rates of 260 kHz. [ Reference MIL-STD-1474D, MIL-STD-398, MIL-STD-882, MIL-STD-2105C, ... ]
Product Noise Control - Navcon provides both problem diagnostic and noise control design services. In addition to the more conventional noise control approaches, our vibration experience gives us a unique insight into structurally radiated noise and its mitigation.
Industrial & Theme Park Noise Control - Navcon engineers are experienced in the design and specification of a variety of noise control measures including barriers, enclosures, lagging, silencers, resonators, etc. Often times we can reduce overall costs by modeling the situation and optimizing the noise control design (i.e., cost vs. decibel reduction, Noise Barrier Design).
Community & Industrial Noise Surveys - Navcon engineers conduct community surveys to determine conformance with noise ordinances and regulations and to trend noise levels in and around industrial facilities. Measures typically include statistical noise descriptors, event recording, octave and narrowband spectra. In order to document and trend noise levels within industrial facilities, Navcon often conducts noise contouring surveys (Industrial Plant Noise Contouring). The graphics can be generated for discrete frequencies or for the overall level. The "near field" noise maps can be used to answer the question, "are we producing more noise today than last year?", an important (and potentially legal) issue for industrial facilities surrounded by residential property.
Community Relations - Navcon engineers have conducted many projects which have had a high community profile. We have made numerous presentations for city councils and community coalitions often playing the role of an independent mediator in environmental noise situations.
Environmental Impact Studies (EIS) - Navcon's basic approach to preparing an EIS is to: 1) record existing community noise levels, 2) develop an analytical noise model of the community including the proposed facility, highway, rail line, etc., 3) make noise level predictions, 4) assess the noise impact relative to the governing noise regulations and 5) prepare an EIS report. If the noise level predictions indicate that the proposed construction is unacceptable, mitigation measures can be incorporated into the analytical noise model and a feasibility study conducted..
Expert Testimony - Navcon engineers have assisted many companies by gathering traceable noise and vibration data, filing depositions, and providing expert testimony in Small Claims and Municipal courts. Drawing upon over 20 year of teaching experience and a multitude of visual aid tools (e.g., 3D graphics, color noise maps, etc.), Navcon engineers are able to convey complicated technical concepts to non technical juries, community groups etc.
Short & Long Term Noise Monitoring - Navcon Engineering has transportable monitoring systems for short and long term monitoring of environmental noise. The systems, manufactured by Larson & Davis can be set up to record specific events (e.g., aircraft fly over, industrial flaring & venting, etc.) as well as the statistical distribution of noise. Navcon engineers download the data from the monitoring sites and prepare environmental noise reports.
Room Acoustics / Indoor Noise - Navcon engineers have conducted numerous projects involving noise planning and control in interior spaces (e.g., offices, board rooms, medical centers, warehouses, manufacturing areas, etc.) The overall approach varies of course with the room use and project objectives. For new construction, Navcon engineers will determine the required impact insulation class (IIC) and/or sound transmission class (STC) for walls, ceilings and floors. In existing buildings, we will study (through measurement or analytical model) the situation and make the appropriate noise (or vibration) control recommendations. Navcon has the measurement hardware and software tools to quantify the sound quality of a room, locate noise sources and trace airborne/structureborne noise paths. Navcon has conduct numerous Field Sound Transmission Class (FSTC) or Field Impact Isolation Class (FIIC) measurements to verify the acoustic quality of existing constructions.
Noise Planning & Noise Control & System Manufacturing
Environmental & Industrial Noise Modeling
Navcon engineers are experienced in the development of 3 dimensional analytical noise models. The models are used to predict the environmental impact of noise generated from within industrial and leisure facilities, vehicular traffic and train pass-bys. Models can also be developed for interior spaces. Sensitivity analyses are conducted to optimize the design of noise control measures, acoustical enclosures, barriers, etc.
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