Impact sound insulation

Parmanen, Juhani, Sipari, Pekka Uosukainen, Seppo. Sound insulation of multi-storey houses. Summary of impact sound insulation. 1999. 22 p. 

Figure 9.18 Dynamic stiffness as a function of compressibility of impact sound insulation slabs depends on its dimensions...

Waste of clothing with proportions of synthetic fibres Thermal, moulded and calibrated 1200 to 1500 g/m Impact sound insulation... 

Dreiphasenpunkt triple point Trittschall impact sound Trittschalldtimmung impact sound insulation trittschallgedtimpft impact sound-reduced Trockenbatterie eiectr dry cell, dry cell battery T rockendestillation dry distillation Trockeneis (CO2) dry ice... 

ISO 10140-3 2010, 2010. Acoustics—Laboratory measurement of sound insulation of building elements— Part 3 Measurement of impact sound insulation. International Organization for... 

With elastic polyurethane adhesives, almost all construction materials are laminated together, such as concrete, wood, ceramics, plastic, and metal. Thus, completely new design possibilities arise. When bonding steps, parquet, or tiles, two advantages come into play, namely, the impact sound insulation and the background-balancing property of the adhesive (Brunner 1996). 

Linnecessary noise, these should be cleaned regularly. Imbalance, whether due to dirt or to other causes, should be corrected by adjustment. Detective bearings should be adjusted or replaced. Struts and sharp edges in front of an impeller should be avoided. Impact noise insulation should be introduced between fan room and floor structure and between fan room and connecting ducts. The fan unit should be enclosed, with satisfactory airborne sound insulation as the objective. 

The ranges of properties in plastics encompasses all types of environmental and load conditions, each with its own individual, yet broad, range of properties (Fig. 1-9). These properties can take into consideration wear resistance, integral color, impact resistance, transparency, energy absorption, ductility, thermal and sound insulation, weight, and so forth. There is unfortunately no one plastic that can meet all maximum properties. Therefore, the designer has different options, such as developing a compromise because many product requirements provide options, particularly if cost is of prime importance. 

Extensive studies have been conducted on the use of recycled tyre to modify concrete and mortars [4-6]. The literature about the use of tyre rubber particles in cement-based materials focuses on the use of tyre rubber as an aggregate in concrete and evaluates only the mechanical properties. Results have indicated that rubberized concrete mixtures show lower density, increased toughness and ductility, higher impact resistance, lower compressive and splitting tensile strength, and more efficient sound insulation. 

Expanded polystyrene (EPS). EPS is a light, solid and compact substance, which has been widely used in European civil engineering as heat and sound insulation. Thanks to its good impact strength combined with a very low weight, it is also an excellent packing material and has been used in other areas of human activity, e.g. the foundry industry. 

By using polymers, proper sound insulation can be achieved easily and effectively. Cellular plastic materials (with open celled flexible structures) are shown to be very effective in sound insulation (either for impact noise from footsteps and movement on the top floors of a building, which can usually be eliminated by floor insulation, or airborne noise, which is from noises in the neighbourhood or the street, and which needs wall/party wall insulation for its elimination). Open cell flexible cellular plastic materials also provide acoustic insulation at high frequencies. 

For insulation of floors in addition to heat insulation, a certain degree of sound insulation must also be considered, which is usually done by means of a floating floor cover laying over an intermediate layer of elastified foamed boards, covered with a layer of PE film. Underfloor heating in houses, with an insulation layer below the underfloor heating, is usually combined with impact-noise insulations. Over hot (steam transfer) pipes, usually XLPE foams are used. 

Portable machines For noise control of internal combustion engines see above. Hydraulic pumps to be enclosed. Drivers or operators cabs to be separate, sound-insulated and on vibration-isolating mountings adequate ventilation essential. Bodies of dump trucks to rubber-lined in order to reduce impact noise caused by stone or other material during loading. 

Thermosets also benefit from the foam structure, as evidenced by improved thermal insulation, sound dampening and mechanical stress absorption responses to temperature changes or impact. Hollow spheres with an already set volume are normally used, that is, pre-expanded microspheres. The reason is that the curing reactions often interfere with any expansion before a sufficient volume increase has been obtained. Hollow organic spheres are found in products such as sealants, adhesives, putties, pipes, cultured marble, body fillers, model-making materials, and pastes [2, 3, 19]. Common suitable matrix materials are epoxies, PUR, and polyesters. 

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