Research On Dynamic Response Of Aerial Platform Fire Truck Under Impact Load

Aerial platform fire truck as a kind of comprehensive equipment with aerial work, fire fighting and rescue service plays an essential role in fire fighting of high-rise buildings. Recently, more and more scholars pay attention to the large aerial platform fire truck. With increasing working height and boom’s length, the dynamic performance becomes a difficult problem in the design of structure and can directly affect the safety of firefighters and rescued persons. At present, the dynamic performance analysis of working height in excess of100m aerial platform fire truck is still relatively rare and yet has no mature design and analysis theory.Aerial platform fire truck is often subjected to non-periodic dynamic load which is different from the load of the traditional crane truck production. Duhamel integration is adopted in this paper to analyze the dynamic response of a single freedom system under impact load. Then the response spectrum of a single freedom system which is used to analyze the dynamic response of aerial platform fire truck is plotted.When firefighters are doing rescue work, the rescued person might jump into the working platform in emergency. Aerial platform fire truck will be subjected to impact load with short load time and large peak load. In order to reasonably describe impact load of aerial platform fire truck, the mechanical model of aerial platform fire truck is established in this paper using the mass-spring-damper system to consider the human body and boom’s character to simulate the process of collision. The force of collision is simulated by the Kelvin method. Then the impact load is imported to FEM model of boom’s system for analysing its dynamic response.The boom’s system is subjected to the reaction impact load when a firefighter is opening or closing fire monitor. The statics analysis for the aerial platform fire truck boom system under an arbitrary direction of the fire monitor is conducted. Then the direction in which the boom’s stress is the maximum is calculated. Based on the response spectrum of a single freedom system, the impact load under opening or closing fire monitor in the direction is simulated by different load curves and load times and imported to FEM model of boom system for analysing its dynamic response.The research results provide a theoretical basis for the dynamic response of aerial platform fire truck and important reference value for the dynamic response of telescopic jib crane. In addition, the results have been applied in the product design and development of DJC101aerial platform fire truck.