Experimental research of bus body noise and vibration

Abstract

The noise and vibrations within vehicle interior have a major impact on the product quality image. For this reason, the research around passenger ride comfort in relation to noise and vibrations is an important part of the product development process within automotive industry. This thesis discusses a case study of experimental noise and vibration investigations conducted for a city bus. The focus of the research is in the bus body interior noise and vibrations. The aim of the study was to reveal the most significant problems related to bus passenger ride comfort in an existing city bus to provide information for the future bus body development work. In addition, the thesis included an extensive literature review of the noise and vibration phenomena and research as theoretical background information. The case study investigations included experimental noise and vibration investigations of the test vehicle operating in actual operating conditions. For example, order tracking analysis, operational and experimental modal analysis and transfer path analysis were utilized in the investigations to provide a comprehensive understanding of the noise and vibration properties of the bus body structure.