This project has been completed in co-operation with Trelleborg Sealing Solutions Kalmar AB. They specialize in developing laminated damping- and isolation products for breake systems. The assignment was to compare different damping materials when excited with airborne and structure borne excitation and to present a proper result, defining one superior method of damping for each type of excitation. Superiority in this case is damping the total sound pressure level the most. This project does not include analyzing the vibrations, merely the noise they cause. All measurement samples has been done with two microphones in a semi anechoic chamber on an aluminum housing representing an oil sump. The excitations has been produced with a speaker and a shaker. The damping materials included in this project are 5 different methods of damping and isolation, made out of different materials and with varying thickness. The result of the comparison between the methods prove ADF (Applied damping foam) to be the most effective method of lowering the sound pressure level with airborne excitation. With structure borne excitation ADM (Applied damping material) proved to be the most effective. With both types of excitation the laminate “dual wall solution” proved to have the lowest effect.
| Identifer | oai:union.ndltd.org:UPSALLA1/oai:DiVA.org:umu-148412 |
| Date | January 2018 |
| Creators | Collén, Emil |
| Publisher | Umeå universitet, Institutionen för tillämpad fysik och elektronik |
| Source Sets | DiVA Archive at Upsalla University |
| Language | Swedish |
| Detected Language | English |
| Type | Student thesis, info:eu-repo/semantics/bachelorThesis, text |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | MA ; MA1801 |
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