Statics And Dynamics Analyses For The Boom Of A Lift-up Fire Engine

Lift-up fire engine is an important fire fighting equipment which can eradicate fire from high-rise buildings. Along with the fast development of our country, economy, high-rise buildings increase rapidly, the fire frequency also increase year by year. So, it is more and more urgent to develop and design the lift-up fire engine. The boom of the JZ66 lift-up fire engine is considered as a study objective.The commercial finite element analysis software—ANSYS is used to analyse statics and mode analysis, transient analysis and harmonic response analysis.In this thesis ,the finite element theory and its analytic software—ANSYS are introduced bridfly,then a finite element model for the JZ66 lift-up fire engine is built by using software ANSYS .The statics and dynamics analyses under horizontal and vertical states are studied when the boom is all outspread. The stress and displacement distributions of the boom in the statics analysis are obtained , based on these distributions, the maximun stress and maximun displacement and their locations are found. It is provided a reference for checking strength and rigidity of the boom. Mode analysis, transient analysis and harmonic response analysis are included in the dynamics analysis. Natural frequencies and their mode shapes in the mode analysis are obtained; Transient displacement responses under the side wind load and vertical impact load are given,and the maximum impact displacements and their locations are obtained in the transient analysis.The harmonic response history and frequency-amplitude curves are obtained in the harmonic response analysis.The results obtained can considered to be as a crucial reference for the design and improvement of strength, rigidity and dynamic performance of the boom. .