Search Results

Interior quietness has been improved over the years until it has now become an important fundamental performance requirement of vehicles. Simple approaches to assuring quietness include the addition of sound isolation materials or the provision of sound-deadening space. These approaches, however, have the undesirable effects of increasing the vehicle weight or sacrificing interior space. Previously, we investigated the effect of the fiber composition on sound isolation performance, focusing on polyester fiber material (nonwoven fabric), and researched sound-isolating materials that would not involve a weight increase. That work led to the development of a polyester fiber material with an optimized fiber composition. The material has been applied to a dash silencer that simultaneously achieves improved sound isolation performance and a lighter weight compared with previous materials. That technology provided the basis for developing a polyester fiber carpet pad.

The authors, et al. have succeeded in the practical application of the abradable flame spray coating, used in aircraft engines for the prevention of air leakage and the improvement of efficiency, to automobile turbochargers for the first time in the world. Two layers consisting of a bond coated layer and an abradable layer used to be coated by separate spray nozzles under the conventional technique. In this paper, equations of relations between various flame spray coating conditions and the quality of coated film, which were derived from measured results, will be described. Flame spray coating conditions, that allow the double layer coating by the same spray nozzle, have been determined for each layer. Temperatures and speeds of the flame were measured by means of two-color type high-speed cameras, and equations of their relations with the flame spray coating conditions are derived from the measured result.