Host: The Japan Society of Mechanical Engineers
Name : Dynamics and Design Conference 2019
Date : August 27, 2019 - August 30, 2019
The number of injured people transported by ambulance in H 28 is 5.62 million, of which the number of seriously ill patients is 470,000, and the average time of transportation is also 39.3 minutes, which is on an increasing trend. Vibration during transportation may worsen the symptoms of seriously ill patients, so a vibration isolation bed is used to attenuate vertical vibration, front and rear inertial forces. However, existing vibration isolation bed resonate with the vibration on the floor during running of the ambulance and the burden on the injured people increases. The goal of this research is to evaluate the vibration characteristics of existing vibration isolation mounts and to elucidate the cause of resonance. In this research, we perform eigenvalue analysis and eigenvalue experiment to evaluate vibration characteristics. An analysis model is created in 3DCAD, specific analysis is performed, and in eigenvalue experiments, a hammering test is performed to find natural frequencies and specific modes to clarify the cause of resonance. Also, the existing vibration isolation bed is placed on a vibration table, the vibration characteristics are evaluated by a sweep test, running experiments are carried out on a car, and vibration characteristics are evaluated
