Acoustical Engineering

When helping an organization deal with noise problems, whether it be an in-plant, community, or office environment, Acoustical Systems recommends an Acoustical Engineering Feasibility Study to provide the client with a clear and accurate picture of the overall situation. The study defines the problem and presents a detailed analysis of what steps can be taken to solve the problems. It is a useful tool for any company trying to find the most cost effective way of reducing noise levels and complying with regulations.

The first step in an acoustical engineering study involves a meeting with Acoustical Systems and the client's project manager. In this meeting the client can outline specific goals and priorities. At the same time, Acoustical Systems will explain the basic testing procedure and schedule the required acoustical testing so as not to interfere with the day to day production operations.

Acoustical Systems then proceeds measuring each relevant machine or process to determine the major noise sources. Room acoustics may be analyzed to determine if reverberation contributes to the noise problem. Measurements will indicate individual noise levels of each piece of equipment, as well as the equipment's effect on the overall noise level. To perform these tests, the cooperation of various personnel is necessary so processes can be isolated and studied. Both sound and vibration levels can be gathered.

All measurements will be acquired utilizing precision sound and vibration instrumentation which meets the latest standards and specifications. The data collection method used will consist of recording sound and/or vibration levels of the noise sources in the area. The data is recorded for analysis on the computer system at our facility in Vandalia, Ohio.

Near field measurements are recorded for identification and analysis of the various noise sources within the equipment or operation under study. Each noise and vibration generating source and its transmission path is investigated.

The recorded data is analyzed on the weighting networks A, B, C, and linear scale, and in 1/3 octave bands covering the audio-frequency range of 22.5 to 20,000 HZ. All noise reduction calculations will be performed on our computer system.

Upon completion of the acoustical measurements, initial noise control suggestions are formulated. Specific recommendations are reviewed with the appropriate personnel to make certain the solution is practical in the actual situation. The input from this review is used in the preparation of the final report.

Based upon the collected data, concept drawings are prepared for each item requiring noise abatement. Construction specifications are formulated for each item and included with the drawings. Implementation costs for each item are prepared along with possible suppliers. A report is then prepared for the equipment being studied. This report contains all acoustical data, analysis, concept drawings, final recommendations, and estimated cost for the implementation. Two copies of the final report will be submitted.

When the final engineering report is completed, a review meeting will be held with the project engineer and Acoustical Systems. The discussion will include a review of the noise sources identified, establishment of priorities for implementing the specific recommendations, and an analysis of the overall impact the noise control program will have on the production process.

Acoustical Systems, Inc., P.O. Box 146, Vandalia, OH 45377-0146. Tel: 937-898-3198; Fax: 937-898-5043.