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Author: admin, 20.10.2013. Category: Treatment For Tinnitus

You Haven't Gotten Any Action In A Long Time And Everything You See Reminds You Of Sex. There are a lot of safety issues for an operator to watch for: falling objects, fire, debris, holes and dozens more. Noise, vibration and harshness (NVH) is a serious health issue facing operators, but bigger ear plugs and thicker seat cushions aren't going to solve it alone. Vehicle noise can derive from a variety of places — engine, muffler, fan, hydraulic system, accessories such as gears, chains and other vibrating components — and each system has a multitude of noise reducing solutions. Vibration: Whole body vibration (WBV) deals with the transmission of vibration into the human body and the effects that vibration can have on an operator in the short- and long-term. Eaton's Fluid Conveyance Noise, Vibration and Harshness Technology lab (Eaton FC NVH), Maumee, OH, is an integrated and custom solution to fully optimize noise and vibration reduction within any hydraulic system where the transfer of fluids is present. The use of Eaton's FC NVH solution can be applied in applications which range from power steering lines, to hydraulic pumps, to active ride systems.
Eaton FC NVH utilizes a custom hose assembly that specifically targets the fluid borne noise to reduce overall noise levels without over attenuation. Specially designed tuning cables allow energy from the pressure ripple to escape at the wave's peak, reducing the amount of energy transferred to the system, thus lowering the amount of airborne noise released.
Eaton's FC NVH lab allows Kurt Steinberger, lead engineer - NVH, Eaton Fluid Power - Hydraulic Business, to test systems or machines on site and utilize Maumee's fluid conveyance prototyping capabilities, as well as its materials test lab, to diagnose the noise problem, design and create a unique system solution in one location."Due to the fact that there is no one-size-fits-all solution, the challenge is to work within the OEM's design parameters as it relates to product envelope size and system pressure," says Steinberger.
Eaton's capabilities allow the NVH technology team to find more proactive solutions to give OEMs a more off-the-shelf solution. Complementing Eaton's FC NVH capabilities are an in-house hemi-anechoic chamber in Eden Prairie, MN, and proprietary software.
To tackle engine noise, Perkins does things like balancing internal loads to the pump to optimize the overall design. Perkins does work on sound attenuation materials, for example, laminate materials are evaluated for their ability to reduce resonance of components such as front end covers. The major part of noise testing for Tier 4 isn't started yet, but Perkins is looking at the increased injection pressures and predicting the pump design as a source of increased noise.
Reciprocating systems such as compressors, pumps and engines produce systemic vibratory torques.
With emissions regulations demanding increased fuel economy, lighter more powerful engines have surfaced.
The Highly Flexible Coupling from Voith Turbo Inc., York, PA, reduces harmful torsional vibrations in drivelines by moving the harmful resonance vibrations out of the operating speed range using a variety of stiffness levels of rubber or silicon, isolating torsional vibrations (engine from gearbox) and damping vibration amplitudes.
One example offered by Doug Sharrot, product group manager - highly flexible couplings, Voith Turbo Inc., shows a 6 dB reduction in the driveline at idle with the coupling installed. An aftertreatment solution to NVH (protecting the operator from noise already released to the air) is a sound deadening or absorbing material.
Federal Foam Technologies (FFT), New Richmond, WI, provides baseline testing, development and design services, and data-driven solutions. Sonus Sorb and Sonus Foam provide absorption to control pass-by (environmental) and operator ear noise issues.


FFT interior trim components combine Sonus Foam, Sonus Sorb and Sonus Tex materials to absorb sound that enters into the cab, while Sonus Flex barriers block external noise. Firwin Corp., North York, Ontario, Canada, supplies special sound insulation products and complex hot environment insulation solutions (temperatures up to 2,000 F) for installation on manifolds, turbo chargers, exhaust piping, silencers and purifiers. Where sound enclosures are not practical due to space considerations, special sound attenuation blankets can be manufactured.
While working with an OEM to design a cab, Randy Reinke, president, and Jim Schmitt, director of engineering and regulatory compliance, Custom Products of Litchfield Inc., Litchfield, MN, have a list of things to consider to reduce NVH. Higher density, higher mass glazing will tend to deflect sound waves rather than allow the sound wave to pass through, or be actuated by the sound pressure and potentially amplify the unwanted sound.
Any source of noise should be kept as far away from the operator as possible, such as locating the engine exhaust systems away from cab, especially the windshield area.
Minimizing mechanical controls that enter the cab such as levers, handles, and other controls that vibrate and generate noise is another common way to reduce in-cab noise. So, put in your ear plugs, check your favorite music reviews, and take a look at the 21 best music festivals in the world!
If you’re ready for a never-ending lineup of EDM musicians to drop the bass on you, then this is the festival for you! There are some who say that Coachella is over; Sasquatch is the festival that might replace it.
When deciding how to conquer the NVH forces, it may be best to know what the sources of noise, vibration and harshness are. Structure borne noise is solved through means of damping (no, not dampening, there's no need to get anything wet) and isolation. Each person has his or her own opinion about harshness, although there are common threads to our likes and dislikes which influence our preferences for one product over another. Eaton has provided fluid conveyance solutions for two decades for automotive applications and is now applying similar techniques for heavy-duty applications.
The ripples create energy fluctuations which pass through the fluid to the structural components and into the air as noise. Eaton's software analyzes hydraulic system characteristics to optimize the noise reduction. Right now each solution is custom made, but with more research, common elements will emerge. These tools enable Eaton to diagnose overall sources of NVH, model the system and run simulations to find the optimal solutions, and present the results and options to the customer. It also pays a lot of attention to the gear train, controlling some of those reactive forces by reducing the backlash in the gears, and testing different gear configurations.
Additionally, rigidly connected components in a driveline will have natural resonance frequencies which will be excited at certain speeds. With fewer cylinders and an increased power density, torsional vibrations become more severe due to lower rotational intertias and greater torque fluctuations. Standard plastics, foams and facing materials in cab interiors are being replaced by integrated composites that provide increased structural, acoustical and aesthetic value.Underhood acoustical and heat issues created by Tier 3 and Tier 4 engines demand more technologically advanced materials to deal with these hotter and louder engines in tighter environments.


Its Sonus® materials are designed to withstand heat and deaden sound under the machine's hood and in the cab. Sonus Flex offers a barrier between the cab and engine to reduce cab noise and provide vibration damping. FFT also offers porous moldable substrates that provide sound absorption, structural integrity and design flexibility.
The products are made from foam composites, rock-wool panels and fiberglass with sound membranes, designed to limit equipment noise to acceptable levels.
Curved or angled surfaces change the angle of incidence of a reflected sound wave, which will tend to diminish the strength of the sound wave (reduce noise), which is why a curved or angled windshield and window glass will deflect outside engine noise better than a flat panel on the cab.
Machine design determines distance limits, so alternative engineering controls are applied to minimize the sound pressure level that is transmitted to the operator's area. If you’re in the first category, then we’re willing to bet that you’re looking for a new festival to check out.
We’ve listed what we think are the best 21 music festivals in the entire world – although truth be told, almost all of them take place in the United States… Location aside, you can bet that we’ve covered the gamut in terms of genre. Coachella is awesome… Provided you can get past all the rich, basic Southern Californian sorts. Airborne noise can be blocked by barriers (walls, thick glass) or reduced by absorbers, such as foam insulators.
Not only can Eaton provide the NVH solution to the customer, but the solution might also result in additional benefits which could include an increase in production throughput and a reduction in components and overall machine weight. These engine and natural vibrations stress the driveline system, shortening component life due to wear and fatigue. Finally, the Sonus Temp materials combine absorption with enhanced heat-resistant characteristics for a more controlled environment.
These gaps are difficult to close and not only will allow noise to enter, but dirt and dust as well," explains Schmitt. There are music festivals on this list that will stoke the fire of your EDM loving head, if that’s your thing.
Perkins has to work closely with the end-user and the machine supplier to understand whether that's going to be acceptable or if it needs tuning to have acceptable noise levels during machine operation."John Bair, executive director at the Center for Advanced Vehicle Design and Simulation at Western Michigan University, Kalamazoo, MI, explains other sources of noise when dealing with an engine, specifically on-highway trucks. To improve sound attenuation, especially in the higher Hertz range, loaded membranes are combined with the glass matt. Depending on the application and specific site restrictions, an overall noise reduction of up to 8-10 dB has been achieved.



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