Experimental Verification of an Instrument to Test Flooring Materials
IOP Conference Series: Materials Science and Engineering
i Preface This study is a result of master's thesis in mechanical engineering at Halmstad University during spring term 2017. I would like to emphasize our thanks Dr. Hans Löfgren for his support guidance, opportunely posed questions that raised new lines of thought and motive to get good work on the thesis. I would like to emphasis sincere thanks and gratitude to Michael Wagner to help throughout the thesis and creation of Matlab code for the fluid model. I am grateful to Loisa Cedergren and
... isa Cedergren and Jonas Hazal for enlightening and inspiring discussion and their advice provided us guidelines in difficult times. I would like as a final word of appreciation to thank the people of functional research group at Halmstad University for their thoughtful comments and suggestion, which continually improve the quality of the dissertation. Abstract The focus of the project is to validate the fluid model with different flooring materials and the measurements of an instrument to test flooring materials and its force attenuating capabilities using mathematical models to describe the signature and coefficients of the floor. As a part of improving the knowledge about the linear dynamics of vibrations involved during the sudden impact caused on hip bones of elderly people during fall. The project The main contribution of the present work focus on the development of a mathematical fluid model for floors. The aim of the thesis was to analyze, compare different floor materials and to study the linear dynamics of falling impacts on floors. The impact of the hammer during a fall is captured by an accelerometer and response is collected using a picoscope. The collected data was analyzed using matlab least square method which is coded as per the fluid model. The finding from this thesis showed that the fluid model works with more elastic model but it doesn't work for rigid materials like wood. The importance of parameters like velocity, mass, energy loss and other coefficients of floor which influences the model during the impact of falling on floors were identified and a standardized testing method was set. Keyword:. Fluid model, coefficients of the floor, linear dynamics, Matlab, least square method. iii .