Short-circuiting by bolts or other rigid connections is the most common issue. Do not over-tighten the bolts, but make sure you use nyloc nuts or thread locking compound. In order for the vibration isolation pads to be effective, additional flexible elements (usually thinner layers of the same vibration isolation material) must be fitted under the bolt heads with load-spreading steel washers or plates as shown in the figure. Any rigid connection across the pads will compromise the vibration isolation. This is particularly the case where vibrating units are bolted to steel supports or floors.Ī high percentage of plant ostensibly “isolated” in this way is not actually isolated as the bolts short-circuit the flexibility provided by the pads. In many simple cases, mounting motors, pumps, gearboxes and other items of plant on rubber bonded cork (or similar) pads can be a very effective way to reduce the transmission of vibration and therefore noise radiated by the rest of the structure. Vibration isolation need not involve steel springs or rubber bushes. Low cost, large noise reductions, rugged. Moreover, this modification could be incorporated into standard production machines at low cost. Forming this component in stainless sound deadened steel contributed significantly to the overall noise reduction of 16dB(A) (from 105dB(A) down to 89dB(A)). In the case of vibratory separator noise reduction when grading confectionery, diagnosis showed that a major noise source was a large thin sheet distribution dome. Examples include weighing machine hoppers (10dB(A) noise reduction), vibratory feeders and conveyors (5 - 15dB(A) reductions) cowls and safety guards (3 - 9 dB(A) reductions) and complete close-fitting enclosures (e.g. There are many successful applications in the food and pharmaceutical industries for noise control using high-performance damping (stainless sound deadened steel in particular as there are no hygiene implications for the treatment). Above c 3mm sheet thickness it becomes increasingly difficult to achieve a substantial noise reduction. The efficiency falls off for thicker sheets. The latter can simply be stuck on to existing flat components (inside or outside) covering c 80% of the flat surface area to give a 5 - 25dB(A) reduction in the noise radiated (use a thickness that is c 40% to 100% of the thickness of the panel to be treated). 1 Vibration damping: reduce noise from guards, hoppers, conveyors, tanks…Ģ Vibration isolation pads: isolate motors, pumps, hydraulics from noise amplifying sounding boards …ģ Fan installation and efficiency: maximum efficiency = minimum noise – fan installation best practice guideĤ Aerodynamic fan noise control – silencing without silencers: retro-fit modifications = less noise + higher efficiencyĥ Pneumatic exhaust silencing: efficient attenuation with zero back-pressureĦ Pneumatic nozzle noise reduction: efficient nozzles that produce less noise and use less air for the same performance…ħ Chains and timing belt noise: simple modifications to reduce noise levelsĨ Electric motor noise: some are easily modified and some should be sent back due to excessive noiseĩ Hydraulic power pack noise: many are designed to maximise noise levels – easily correctedġ0 Convert to acoustically effective guards: existing safety guards can often be modified to make them effective acoustic guardsĪdapting and applying the techniques: often free by email.ĭownload the Top 10 noise controls pdf with sound here >Įither re-manufacture steel (or aluminium) guards, panels or other components from commercially available sound damped steel or buy self-adhesive steel sheet from the supplier.
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