Volume 6, Number 4, December, 1998 - Noise News International

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fied by using only a single multiconductor cable between the sensor's hermetic four-pin connector and a PCB multichannel ICP sensor signal conditioner. Operating on as little as 10 VDC from the power supply, Model 370A22 Capacitive Accelerometer provides frequency response from 0 to 300 Hz. This hermetically sealed accelerometer features 100 mV/g sensitivity (±5%) and an amplitude range of ±20 g peak for a wide variety of general purpose low-level, low-frequency acceleration or uniform acceleration measurements. Air damping improves temperature stability, attenuates high-frequency "ringing," and allows the accelerometer to withstand higher-g overloads. A welded titanium four-pin connector offers the convenience of a detachable cable without sacrificing hermeticity. For additional information on these accelerometers, contact Andrea Mohn, Marketing Assistant, PCB Piezotronics, Inc., 3425 Walden Avenue, Depew, NY 14043-2495. Telephone: +1 800 828 PS9200KlfT M Reader Service Number 33 8840; FAX: +1 7166840987. E-mail: amohn@pcbOOl.pcb.com. Circle Reader Service Number 56. SONEXvalueline Panels Offer Economical Acoustic Control. illbruck, inc. manufactures SONEXvalueline panels for industrial applications that require effective sound absorption at an economical price. The panels are sculpted from willtec'', an open-cell melamine foam that is 100% FIBER-FREETM. SONEXvalueline panels measure 2' x 4' and come in thicknesses of 1-112", 1-7/8", and 2-112". Colors include natural (white) and painted charcoal, beige, brown, or blue. The combination of a subtle surface pattern and an open-cell foam material is said to deliver a noise reduction coefficient of 0.75 to 1.05, depending on thickness. Reducing noise in industrial settings has been shown to improve worker satisfaction, productivity, and safety. Communication between workers improves, stress is reduced, and individual ear pro- Precision Acoustic Measurements Re uire Precision Micro hones $1650 USD A complete lEe and ANSI Type 1 Me surement Mic System with responses to 40 kHz. range from 14 d BA to 160 dBSPL. "1/2 inch mic (4 models) and preamp "PS9200 2 Channel PS "AC Adaptor "WSI windscreen "SCI custom storage case Options: 511E ~alibrator; 1 & 1/4 inch mics; and Gain ACO Pacific, Inc. 2604 Read Ave., Belmont, CA 94002 USA Tel: (650) 595-8588 FAX:(650) 591-2891 ACOustics Begins With ACOTM tection, which OSHA standards require if noise level is above 85 dB, can sometimes be eliminated. illbruck, inc. makes acoustic control products for a wide variety of specialized applications. For more information, including literature on SONEX products for industrial applications, contact illbruck, inc., 3800 Washington Ave. N, Minneapolis, MN 55412. Telephone: +1 8006620032 or+1612 520 3620; FAX: +I 612 521 5639. Please visit our Web site at: www.illbruck-sonex.com. Circle Reader Service Number 57. Inexpensive acoustical analysis software with FEWaves 3.0 from MSTR Technology. MSTR Technology announces a new software package of interest to designers of acoustical devices. FEWaves 3.0 is a finite-element- based structural/acoustical analysis package developed with the collaboration of industrial partners, that concentrates on low cost, ease of use, efficient solution techniques, and quick response to customer needs. FEWaves 3.0 is said to have collapsed all the intricacies of finite element analysis of acoustic devices down to a few simple steps. All2D and most 3D geometries and finite element meshes are created using an automatic mesh generator. The most complex 3D models can be imported from standard formats of user defined formats to merge with in-house developed codes. Application of boundary conditions, running the solution, and visualizing the results rely on learning only a few input windows. This package has been designed and developed by tranducer designers interested in getting fast and accurate answers, not in investing a career mastering a software analysis package. Engineers use FEWaves to predict the impedance and acoustic response of fluid (water, air, oil, etc.) and structural loaded piezoelectric devices. Pure acoustic problems predicting the mechanical impedance can be solved using pressure and velocity sources. Other features include grid refinement, animation, and acoustic radiation plots. All input and output files are ASCII. FEWaves is available for PCs with Windows 95/NT or SUN Solaris workstations. For further information, contact Rick Morrow, MSTR Technology, 17 Appleton Road, Rexford, NY 12148. Telephone: +1 242 NoiselNews International 1998 December
518584 3754; FAX: +1 5185809525; e-mail: info@mstrtech.com. Circle Reader Service Number 58. Real Time Meteorological Measurements to Support Noise Engineering Projects and Sound Propagation Studies. AeroVironment Environmental Services Inc. (AVES) of Monrovia, California, provides measurements of temperature, humidity, and wind profiles to noise control engineering firms using balloon borne (tethered or free flight) instrumentation and acoustic measurement systems (Doppler Acoustic Sounders). AVES is an environmental consulting and measurements firm who has been in business since 1972. AVES has manufactured a comilete line of Doppler Acoustic Sounders (acoustic wind profilers) since the miJ-1970s. The company also has airsoncle and tethers onde systems that have been used to provide model inputs to sound propagation models during the testing and validation stages. Recently AVES provided continuous measurements of wind speed, wind direction, and temperature at four altitudes (ground level, ]0 meters, 50 meters and 100 meters) using a tethered balloon system. These data were the data inputs for a sound propagation model that was being validated by a client. For further information, call or write Alexander N. Barnett, AeroVironment Environmental Services Inc., 222 Huntington Drive, Suite 200, Monrovia, California 91016. Telephone: +1 626 357 9983; FAX: +1 626 359 9628; e-mail: barneu@aerovironment.com. Circle Reader Service Number 59. Oticon Introduces First Digital Hearing Aid for Hard-to-Treat Noise Induced Hearing Loss. Oticon has introduced DigiFocus SKITM. An estimated 10 to 20 percent of the hearing impaired population suffer from noise-induced hearing loss and should benefit from this new digital technology. The proprietary technology and software of DigiFocus SKI is said to enable the hearing care professionals to assist patients where they need it in the least intrusive way. DigiFocus SKI features a fitting rationale that is specifically developed for the patient group with 1998 December more than 25dB/octave slope hearing losses starting at 1kHz or above. At low frequencies, DigiFocus SKI applies syllabic compression. In the critical transition zone, where hearing begins to drop off rapidly, DigiFocus SKI automatically finds the appropriate crossover frequency and switches to a linear amplification approach. In high frequencies, the instrument applies compression limiting with reduced gain rules in order to assist in noisy situations and avoid over- loading the more severely damaged part of the auditory system. The instrument offers an algorithm featuring a new loudness model, new gain formulas, new vent recommendations, seven-band frequency shaping for maximum clarity and comfort, syllabic compression in the lower frequencies, automatic crossover frequency, and high-frequency compression limiting. Custom versions of DigiFocus SKI are as small, discrete in-the-ear instruments. a smaller footprint a more cost-effective design on-hazardous /non-flammable wedges Combining 25 years' experience in the design and construction ofmodular acoustic panels with the expertise of an NVLAP accredited testing facility has re-invented the anechoic chamber, developing a system that meets industry needs better than any such testing chamber has before. The revolutionary, patent pending chamber incorporates anechoic wedge elements within uniquely effective acoustic panels that have earned Acoustic Systems its reputation as a leader in modular sound isolation. This innovative design produces an anechoic chamber that performs better than the old-style models while costing less to acquire, install and maintain. It requires less exterior space relative to working interior space and utilizes a uredqe con~truction tha~ eliminates t~edifficultj~:: : ossocloted with metal or fiberglass deslgns.===:::::: --•••• 111 _ •••ru u ACOUSTIC- - ····1I 1 SYSTEMSIIIIIUII U k.~ =t.:i:~l~t.:~
Page 1 and 2: Volume 6, Number 4 1998 December IN
Page 3 and 4: Editorial Stllff G. Maling, Jr., Ma
Page 5 and 6: Anechoic Chambers with EMW lining T
Page 7 and 8: "Finally, an Outdoor Sound Propagat
Page 9 and 10: YOUR NEXT SOUND METER • Workplace
Page 11 and 12: Feature Noise Control Standards for
Page 13 and 14: specify in more detail relevant mea
Page 15 and 16: c: o .~ "E f---7""'lf-1I:-i~;J4'.--
Page 17 and 18: References 1. Council Directive 89/
Page 19 and 20: Feature Advances in Acoustical Stan
Page 21 and 22: (a) M 4 6:~f=========::::CI~ Fig. 3
Page 23 and 24: Adaptor for Microphone & Preamplifi
Page 25 and 26: the last twenty years and be ready
Page 27 and 28: CONTROL The illustrations in thisfe
Page 29 and 30: Application to machines with connec
Page 31 and 32: Application with a thin screen. Exa
Page 33 and 34: Application with light single walls
Page 35 and 36: European News A. Cops, European Edi
Page 37 and 38: Pan-American News George Maling, Pa
Page 39 and 40: Contest entry forms and other mater
Page 41 and 42: Newly published ISO and IEC Standar
Page 43 and 44: ACOUSTICS ANSI Sl.15-1997-Part 1, M
Page 45 and 46: NNI Directory Organizational and Ed
Page 47 and 48: ~----- REAL TIME ANALYSER APPLICATI
Page 49 and 50: Brazil: +55 II 8200388; +55 II 8207
Page 51: The BS-112 comes equipped with a 6-
Page 55 and 56: World Conference Calendar This cale
Page 57 and 58: COLIN GORDON & ASSOCIATES Specializ
Page 59 and 60: The NewMo e 2 Real Tune Analyzer Fe

Volume 6, Number 4, December, 1998 - Noise News International

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