Examples of Common Noise Solutions
The following three examples represent typical noise problems. We hope that outlining a few examples will illustrate proven products for airborne and structural noise control. This guide is intended to answer your questions; however, it is not intended as a guide for every situation. Due to space limitations it is not complete. Please contact HamiltonJet for additional advice concerning complete noise control packages for specific applications.
Generators, pumps and other industrial machinery share some common problems. Combinations of products that address both the structural noise component and the airborne component are required. Remember that barrier products must fit tightly to be effective, absorber products do not have to be tight, but should cover as much of the surface as possible. Damping products should cover 70-80% of the surface area being treated to work well. A typical approach to this kind of noise source could include:
- Build a sound shield (box) from plywood using L150 IL. Use L150 IL for the "base" or floor as well.
- Line sound shield with Barrier 104 or Sonolead.
- Be sure you use appropriate flex mounts on the generator or pump. Vibra-Check pad is sometimes an alternative.
- Damp any flat paneled areas with “L” series or Dexdamp 432 to reduce resonance.
Trucks and cars can be very difficult to address but very significant improvements can be achieved. Again we must use a combination of barrier, absorber and structural damping materials to achieve optimum results.
- Damp flat panel areas such as doors, roof panels and floors. “L” series or Dexdamp 432 dampingsheet are ideal for this.
- Use a soft absorbent headliner material such as 101PV in the cab area to absorb air borne noise.
- Apply a barrier material to the firewall to reduce noise penetration from the engine compartment. Barrier 825 is well suited for this.
- Use a good carpet pad/barrier material under the carpet to reduce intrusive road noise. Barrier 662 works well.
Old time mariners say their boats “get quieter every year.” This gives you some idea how critical a good noise package is to your own hearing. We can address this problem numerous ways:
- Damp engine room bulkheads, decks & tanks with CN tile,"L" series, or Dexdamp 432 damping sheet.
- Where possible build floors, bulkheads, stairs and walls using L150 IL damping sheet.
- Apply Barrier 104 or Sonolead to the engine room ceiling, and forward and aft bulkheads. This is very important.
- Damp area above propellers, under the engines and along the stringers with CN tile.
- Cover as much of the cabin walls and ceiling with a soft absorber material such as 101PV.
- Damp top of full tanks with CN tile or "L" series damping sheet.
- Line the hull with acoustical fiberglass board to absorb airborne noise.