Abstract
Rubber bearings for building isolation
Noise and vibration isolators are used to prevent the downward transmission of vibration from a machine to a structure, the upward transfer from the structure to a sensitive machine, or to isolate a complete building from ground vibration. Ground vibration may be generated by above-ground or under-ground passenger or freight trains, or heavy motorized vehicles, such as trucks or military equipment. The source may be industrial hammers, power plants, or industrial machines, close enough to cause a problem.
When the isolators are installed to prevent the downward flow of vibration from a source to the ground or structure, it is termed as “positive isolation.” When the reverse is true and the isolators prevent the upward passage of vibration, it is “negative isolation.”
Steel springs are more effective, but Neoprene and Natural Rubber pads are also used to reduce vibration to entire structures or structural components such as individual floors or a theater within a building to levels that are unnotable or totally acceptable.
Since the disturbing frequency can be measured from a known source, the variable is the pad frequency or resonance. This frequency is a function of deflection, the shape of the load–deflection curve, and dynamic stiffness.
Helical steel springs have straight line load–deflection curves and the dynamic stiffness at fd is the same as the static stiffness (stiffness when loaded slowly).
Rubber materials do not test that way because they have “dynamic stiffness.” When the pad is vibrated, it resists the rapid motion, so the spring rate in motion (dynamic) is higher than the static stiffness indicated on a load versus deflection curve. Dynamic stiffness is expressed as ratio as given below:
The static deflection must be reduced by the dynamic stiffness ratio before it can be entered in the frequency equation. Therefore, larger static deflections are needed when using rubber isolators as compared with springs to obtain the same reduction in vibration transmission.
For more information, please visit the following link: http://www.mason-uk.co.uk/ab104v2.pdf
Portable data recorder for acoustics and vibration analysis
The DR-7100 is a portable data recorder for acoustic and vibration with high accuracy.
In recent years, we are living surrounded by the equipments which make noise and vibration such as a car, a railroad, a household electric appliance, and a wind power. These equipments are now required for more quiet, more comfortable, and lower vibration than ever.
The DR-7100 greatly helps to make such comfortable acoustic environment by recording sound and vibration on site with ease and high accuracy.
Features
Data recording with high speed and high accuracy (4ch 40 kHz range 24 bit*1);
Dynamic range of 90 dB or more;
Equipped with a connector for a rotation pulse input;
Available for SDHC 8 GB;
Speedy setup by TEDS sensor;
Compact body of A5-size;
2-Unit synchronicity function (option);
*1.40 kHz range: option (20 kHz band frequency: standard).
For more information, please visit the following link: https://www.onosokki.co.jp/English/hp_e/products/keisoku/s_v/dr7100.html
Floating floors for vibration isolation
Many floor assemblies have to withstand extreme loads while at the same time provide excellent sound isolation. Regupol America has developed 20 unique product types for floating floors, available in different thicknesses with load range performance from 0.5 to 362 lbf/in2. This wide range of products and thicknesses helps you find the most appropriate product for your specific project needs.
Benefits
Withstands high dynamic loads and point loads;
No cumbersome jack-up system;
Very low structural height;
Constant natural frequencies over wide load ranges;
Permanently elastic and highly resilient;
Negligible creep, even under high static and dynamic loads;
Quick and easy installation with roll-out products;
Maintenance free;
Continuous full-area support;
Provides stability and reduces risk of cracks; Allows thinner slabs and less reinforcement.
For more information, please visit the following link: https://www.regupol.com/acoustics/applications/floating-floors/
Powerful acoustic simulation software
Improve the acoustic performance of your designs with this complete simulation solution used by leading manufacturers around the world.
Actran is the premier acoustics software to solve acoustics, vibro-acoustics, and aero-acoustics problems. Used by automotive manufacturers and suppliers, aerospace and defense companies, and consumer product manufacturers, Actran helps engineers better understand and improve the acoustics performance of their designs.
Actran provides a rich library of material models, a complete element library that includes infinite elements, high-performance solvers to solve large-size problems, and a user-friendly graphical user interface (GUI) that is highly customizable to your needs. Actran, with its modular nature, can be deployed based on your applications and requirements.
Actran Acoustics is the foundation module of the Actran family. It is both a standalone tool and a pre-requisite for advanced modules such as Actran VibroAcoustics, Actran AeroAcoustics, and Actran TM. Some of the robust capabilities of this module include the following:
Simulate standard and convected acoustics;
Extract acoustic modes;
Analyze sound field in cavities, with either modal or physical approaches;
Model absorbing walls using impedance conditions of porous material models;
Analyze sound radiation;
Analyze sound propagation in ducts, and intake and exhaust lines or distribution systems in buildings, aircrafts, and automobiles;
Recover vibration results from most FEA (finite element analysis) structural solvers for radiation analysis.
Sample applications
Sound radiation by vibrating structures: powertrain, engine components (oilpan, intake manifold and air filter, valve cover, etc.), compressors, electrical motors, loudspeakers, and more;
Intake and exhaust noise, including complex mufflers and silencers;
Air-conditioning units and distribution systems (calculation of transfer matrix coefficients);
Sound absorption inside passenger compartment of cars, trains, and aircrafts;
Sound propagation in complex media with mean flow or temperature gradient;
Audio devices such as telephones, hearing aids, or musical instruments.
For more information, please visit the following link: http://www.mscsoftware.com/product/actran-acoustics
Seismic cable restraint connectors
Kinetics QuakeLoc™ connector is featured in our new lineup of standard seismic cable restraint systems. Sure to be a contractor favorite, the QuakeLoc connector quickly and easily fastens cables used in the seismic restraint of piping, duct, electrical cable trays, and suspended equipment. QuakeLoc is proudly made in the United States.
Seismic Cable Restraint Systems carry tension-only loads along the axis of the cable. They are used in pairs 180° apart to restrain pipe, duct, electrical distribution systems, or equipment in each axis. Cable restraints provide a load path between the building and the restrained component to ensure that it moves with the building. Bracing is required on both primary axes for all restrained systems. Spacing is determined by the building code and specifying engineer. Cable restraints are required for isolated systems as rigid restraints such as strut will short-circuit the isolation.
Kinetics QuakeLoc connector is available for purchase as part of Kinetics QuakeKit-P (Pipe), QuakeKit-D (Duct), and QuakeBulk seismic cable restraint systems. Kinetics QuakeKits are competitively priced and offer substantial labor savings when compared with competitors systems. Each kit includes the necessary hardware to connect to suspended components. Hardware to attach QuakeKit systems to concrete, steel, or wood structures is also available.
For more information, please visit the following link: http://www.kineticsnoise.com/quakeloc/index.html
Air barrier gaskets
With the strict, new air-leakage requirements of the International Energy Conservation Code (IECC), builders must make residential structures tighter than ever. ArmaSeal Air Barrier continuous foam gaskets are the efficient way to tightly seal the building envelope. ArmaSeal is Armacell’s new, flexible foam gasket engineered to stop infiltration of outside air indoors and indoor air into building crevices and openings. Building a tighter structure prevents warm, moist air, and humidity from filling the envelope cavities, causing condensation resulting in mold or rot. A well-sealed home will also save energy, dramatically lowering heating and cooling costs. ArmaSeal is the quick and simple solution to filling construction gaps. It applies easily with no drying time like caulk and fills larger gaps with one application.
Typical locations for gaskets include between the following:
Top of the foundation and the mudsill;
Subfloor and the bottom plate;
Window frame and the rough opening;
Bottom plate and the drywall;
Top plate and the drywall.
Trusted performance
ArmaSeal Air Barrier Gasket materials can provide a range of performance characteristics including the following:
Semi-closed or closed cell structures;
Excellent weatherability and ultraviolet (UV) stability;
Density from 3.5 to 8 lb/ft3;
Excellent tear strength for durability in the field.
Additional benefits of ArmaSeal Barrier Materials are as follows:
Soft, flexible, and conformable;
Closed-cell and compressed semi-closed cell structure prevents moisture wicking;
Stops air, moisture, and dust infiltration;
Sound attenuation and vibration damping;
Acts as an acoustic decoupler, increasing STC (Sound Transmission Class) rating of 7 dB points according to ASTM E90;
Conforms to irregular surfaces when compressed, filling gaps, and expansion joints.
For more information, please visit the following link: http://www.armacell.us/fileadmin/user_upload/Acoustical_Solutions/ArmaSeal.AirBarrier.Datasheet.EN.US.2015.pdf
Noise dosimeter
SV 104 Noise Dosimeter brings incredible functionality into a compact style instrument. The SV 104 instrument is a revolutionary new approach to occupational health and safety noise monitoring offering voice comments and audio events recording functions which are a new concept in an instrument of this size. The measurement data are safely stored in the large 8-GB memory, and the amazing OLED (organic light-emitting diode) screen displays information in both text and graphical form and offers excellent visibility even in full daylight.
This personal dosimeter has a robust 1/2 MEMS (micro-electro-mechanical system) microphone enabling easy calibration using most commonly available acoustic calibrators. The SV 104 is a cable-free dosimeter and is typically attached to the user’s shoulder, close to the ear using the mounting clips supplied. The instrument works with Svantek’s specialist health and safety software package, “Supervisor,” and is powered using built-in rechargeable batteries or through the USB interface which also enables easy connection between the SV 104 and a PC.
Never before has a noise dosimeter been so accomplished yet affordable, making your measurements more accurate and reliable than ever before.
For more information, please visit the following link: http://www.svantek.com/lang-en/product/4/sv_104_noise_dosimeter.html#about
Spectrum analyzer solutions for acoustics and vibration
Welcome to Pioneer Hill Software. If you have been searching for a solution to your acoustic and vibration test and measurement needs, then you have found the right place.
Our products are the choice of engineers, technicians, and scientists at leading businesses, research institutions, and independent laboratories around the world. Regardless of the application, they all need a powerful and cost-effective spectral analysis measurement system.
We offer a range of solutions depending on your application requirements and budget which are as follows:
SpectraPLUS-RT provides real-time spectral analysis with Narrowband, 1/1 or 1/3 Octave resolution. Signal generation and recording/playback are also available. It is designed for users needing a high-quality spectrum analyzer with a minimal learning curve.
SpectraPLUS-SC is a powerful, dual-channel signal analyzer with real-time recording/playback and post-processing. It features a comprehensive set of displays for spectrum, time series, and phase measurements, as well as advanced joint time and frequency analysis (spectrogram and three-dimensional (3D) surface plots). A wide selection of tools and utilities for signal generation, distortion, and reverberation measurements are available plus the ability to automate the analyzer for production testing or other needs. It also features triggering, transfer functions, and much more!
SpectraDAQ-200 is a custom-designed precision data acquisition sound card specifically developed for test and measurement applications. It features fixed gain steps for easy calibration to your transducer sensitivity, IEPE power for accelerometers and microphones, and standard BNC (Bayonet Neill–Concelman) connectors widely used in test environments. It is designed with exceptional dynamic range and extremely low distortion.
For more information, please visit the following link: http://www.spectraplus.com/
Hand–arm vibration measurement system
HealthVib® HAV100 system measures and analyzes hand–arm vibration (HAV) as required by ISO-5349 and EU-directive 2002/44/EG.
Performing measuring by HealthVib HAV is easy to learn and carry out. The unit does not require cables or any special configurations. HealthVib HAV can be used in field conditions. HealthVib HAV100-6Ch is an instrument system for measuring hand–arm vibrations on both hands at the same time in three directions, x, yx, and z, calculated as vector sum according to the EU directive. This functionality reveals the vibration origin and thus makes it easier to choose the corrected preventive action.
HealthVib HAV100-6Ch consists of a pair of measurement gloves, an Active unit (the basic unit and perform the main analysis), Passive unit, and Vibindicator HAV.
ISO 5349 requires measurement and report for both hands and uses a second HealthVib HAV; Passive unit is easily fullfiled. HealthVib HAV Passive unit has a wireless connection to the basic HealthVib HAV and Active unit.
Vibration data are stored and analyzed during the measurement. The HealthVib HAV100 can be wireless connected to a Vibindicator™ HAV for simultaneous presentation of the actual and accumulated vibration exposure.
For more information, please visit the following link: http://www.cvk.se/index.php/en/meny-products/meny-hav/meny-hav6ch