A novel ambulance stretcher based on parallel mechanism and its vibration isolation per-formace analysis

作者：Xiang Gao; Junchuan Niu; Ze Li

来源：25th International Congress on Sound and Vibration 2018: Hiroshima Calling, ICSV 2018 , 2018-07-08 to 2018-07-12.

• Ambulance stretchers
• Geometric relations
• Lagrange equation
• Parallel mechanisms
• Parameters uncertainties
• Time and frequency domains
• Uncertainties
• Vibration isolations

The recumbent patients on the ambulance stretcher experience multi-dimensional excitations due to road roughness. In order to isolate the multi-dimensional vibrations validly, a novel ambulance stretcher based on 4-PUU parallel mechanism is proposed. Firstly, the kinematic and dynamic equation are deduced by geometric relation and Lagrange equation respectively. Subsequently, the vibration isolation performance is investigated in time and frequency domain. Further, selecting RMS value as the index of vibration isolation performance, the index with geometric parameters uncertainties, mass uncertainty and spring uncertainty is discussed. Simulations results demonstrate the stretcher system can isolate the multi-dimensional excitations in supine patients sensitive frequency range effectively. The RMS values show different characteristics with uncertainties because of altering Jacobin matrix of the stretcher.

• 出版日期2018