The purpose of this research is to establish shock-absorbing design in developing composite leaf spring landing gears for small low speed aircraft in the 250Kg class. Design, analysis, fabrication and experiment of two types of composite leaf spring landing gear have been performed under given design requirements derived from landing conditions (landing weight, sinking velocity, ground reaction factor, vertical stroke, etc.). Once design factors are determined, preliminary design is carried out based on energy equation and linear beam theory. Based on nonlinear and dynamic analysis by commercial FEM program (ABAQUS), design modification is performed. Two different design conditions are adopted for the design and two types of full-scale specimen are fabricated using epoxy based unidirectional glass and carbon fabric prepreg, respectively. Drop test equipment is established to determine dynamic behavior, ground reaction force and internal strain of the leaf spring strut. Test results are examined to verify the design results and are compared with the analyzed results.
Shock absorbing design of composite leaf spring landing gear
1999
12 Seiten, 9 Quellen
Aufsatz (Konferenz)
Englisch