TAILIEUCHUNG - Theory Design Air Cushion Craft Episode 13

Tham khảo tài liệu 'theory design air cushion craft episode 13', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 466 Structural design 1. ACV lifted by crane 2. ACV static on the ground rigid surface normally three-point loading 3. ACV SES operating cushion borne over ground ACV or water surface ACV and SES 4. ACV SES operating on cushion in waves at high speed including wave slamming when the following slamming conditions have to be considered a wave slamming at the CG of craft b slamming at bow stern instantaneously c slamming at bow only. 5. ACV SES on hull-borne operations a in sagging condition b in hogging condition. The conditions listed under 4 and 5 are similar to those applied to conventional ships. The differences between them are the dynamic bending moment acting on the hull caused by the wave slamming of the craft and the hydrodynamic impacting force acting on the shell plates. This requires a different method of calculation for the overall and local strength of craft so we will introduce briefly the procedure and conditions for strength inspection of hovercraft. ACV SES operating on cushion at high speed in waves - wave slamming at the CG or bow stern instantaneously In this case the craft can be considered as not heaving or pitching therefore the equilibrium conditions for the vertical force are as follows taking an ACV as the example JF F Acpc p where w is the craft weight Fị the inertia force of the craft Acpc the total cushion lift and pw the impacting force of waves from equation and Fig. . In the above equation the inertia force can be taken as the weight at the different longitudinal position ordinate times the vertical acceleration acting on this position . the inertial load times the gravitational acceleration g. In general the craft length can be divided into 20 ordinates for calculation. In the case where the wave slamming is acting on the CG the impacting acceleration will be constant along the longitudinal axis and without pitching then we have Av w The impacting length can be taken as 4 symmetric about the craft s CG. .

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