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APT 's wide range of engineering analysis services complement the company's diverse testing capabilities. These engineering capabilities include:
- Static Strength, Linear and Non-Linear
- Dynamic Strength and Fatigue Mode/Frequency
- Transient Dynamic and Seismic Spectrum
- Heat Transfer/Thermal Stress
- ANSYS, MSC/NASTRAN, COSMOS/M Programs Experience
- Experimental Modal Analysis
- Mode/Frequency and Damping Extraction
- Verification/Calibration of Analytical Models
- Structural, Identification, and Modification Assessment
- Seismic Qualification
- Power Plant Equipment
- Uniform Building, Bellcore, CA, IEEE Codes
- Test Requirements and Procedures
- Fixture Design for In-house and/or Customer Site Testing
- Instrumentation Selection and Gage Placement
- Data Evaluation and Statistical Analysis
- Analysis Documentation
- Complete per Applicable Code and/or Customer Requirements
- Engineering Assessment of Analysis/Test Results.
APT investigates and solves problems concerned principally with acoustics and vibration in systems as diverse as space structures, aircraft, automobiles, airports, railroads, submarines, office buildings, and symphony halls. The Group offers an array of disciplines that include physics, acoustics, mathematics, psychology, and computer science. APT measures, analyzes, designs, develops, and builds to meet the specialized needs of its clients. In addition to these activities, APT also provides extensive consulting services in acoustics and vibration to a wide variety of clients including airports, industry, architects, and community planners. The close relationship between research and consulting activities allows APT to provide a unique perspective on solving real-world problems.
General capabilities & experience include:
- Physical Acoustics
- Structural Vibration & Acoustics
- Acoustic Measurement & Instrumentation
- Environmental Noise
- Architectural Acoustics & Noise Control
- Acoustics Facility & Systems Design
Computer equipment emits and generates acoustic energy. These emissions come from fan, printer, power supply, disk drive, keyboard and electromechanical devices. Acoustic noise data is needed by users, customers and authorities. In order to correlate the measured acoustic noise level with required limits that have been established as either safe or non-annoying for operators and personnel, it needs to be measured in a standardized manner. ISO 7779 has been widely recognized as the standard. Ideally, the measuring environment should be a semi-anechoic room, which is free from reflecting objects.
Sound pressure
A-weighted sound pressure at operator or bystander position is the common form of presenting acoustic noise level. The recommended sound pressure level depend on the product class and the environment in which the product will be used.
Sound power
Besides sound pressure, sound power data is also needed by customers in several European countries. The sound power of an equipment is calculated from sound pressure levels measured on a hypothetical surface enclosed the equipment. The recommended sound power level also depends on the product class and the product environment.
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