Analysis Of The Boom's Mechanical Properties And Design Of The Control System's Communication Methods For The High Altitude Fire Truck

The high altitude fire truck is one kind of special vehicles used for extinguishing fire on high-rise buildings, rescuing the trapped and the precious materials, and implementing other rescue missions. The boom is the main feature of the high altitude fire trucks, and is the exemplification of the entire high altitude fire truck function, the design technology level of the boom has the direct impact on the development and innovation of high altitude fire trucks. Therefore, the study of the high altitude fire truck has important practical significances.Take the new product development project as a support, the boom of the25m high altitude fire truck is designed and analyzed using the co-simulation approach based on Elasticity theory and Flexible body dynamics theory. In addition, the communication approach of the entire vehicle is introduced simply. The paper's main researches include the following:Through the market research, combined with the national standards, the boom structure, cross-sectional forms, the maximum working height and the boom lengths are determined, the analysis platform is built based on the co-simulation method and the three-dimensional model of the booms is created on this platform.The methods of establishing the boom modal analysis model and modal extraction are studied, According to the results of the modal analysis, the relationship between the inherent frequency of the boom structure and the boom vibration amplitude is revealed. Therefore, methods and measures to avoid the boom resonance can be obtained.According to the causes of the dynamic loads, its formulations are established. Then, the transient analysis is done on the basis of modal analysis. The relationship between the boom structure response and the external load is revealed. According to the relationship, the impacts of the external impact load on the boom and the entire vehicle are analyzed, and the measures to reduce the boom vibration are proposed.In this paper, modeling methods of rigid-flexible coupling dynamics are described in detailed. According to the movement simulation of the boom in expansion process, the relationship between the force and the moment of the connect sets and the time is revealed, the most dangerous working conditions of the vehicle are identified. The subsequent Static analysis of the boom structure can be also based on this relationship. Taking the analysis result of the rigid-flexible coupling dynamics as boundary conditions, the finite element models of the boom can be established. After the solution, the cloud image of the stress and the strain can be got, and strength and stiffness of the boom can be also validated. In addition, according to the relationship between the boom structure and stress distribution, Considerations in the production and manufacturing processes can be summed up.Finally, in this paper, the composition of the control system is analyzed and studies, and each unit of the whole system is divided into master and slave nodes. The communication object IDs and node IDs are assigned to each node. According to the practice communication parameters and mapping parameters are determined. At last, the object dictionary and the communication flow are edited.This research shows the general process of product design and development of high altitude fire trucks. Methods of the paper have theoretical significance and engineering value for the other similar products.