TAILIEUCHUNG - Advanced Vehicle Technology Episode 1 Part 2

Tham khảo tài liệu 'advanced vehicle technology episode 1 part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | centre of contact Fig. Body underframe alignment checks floor a rule or tape is used to measure the distances between centres both transversely and diagonally. These values are then chalked along their respective lines. Misalignment or error is observed when a pair of transverse or diagonal dimensions differ and further investigation will thus be necessary. Note that transverse and longitudinal dimensions are normally available from the manufacturer s manual and differences between paired diagonals indicates lozenging of the framework due to some form of abnormal impact which has previously occurred. Engine transmission and body structure mountings Inherent engine vibrations The vibrations originating within the engine are caused by both the cyclic acceleration of the reciprocating components and the rapidly changing cylinder gas pressure which occurs throughout each cycle of operation. Both the variations of inertia and gas pressure forces generate three kinds of vibrations which are transferred to the cylinder block 1 Vertical and or horizontal shake and rock 2 Fluctuating torque reaction 3 Torsional oscillation of the crankshaft Reasons for flexible mountings It is the objective of flexible mounting design to cope with the many requirements some having conflicting constraints on each other. A list of the duties of these mounts is as follows 1 To prevent the fatigue failure of the engine and gearbox support points which would occur if they were rigidly attached to the chassis or body structure. 2 To reduce the amplitude of any engine vibration which is being transmitted to the body structure. 3 To reduce noise amplification which would occur if engine vibration were allowed to be transferred directly to the body structure. 12 4 To reduce human discomfort and fatigue by partially isolating the engine vibrations from the body by means of an elastic media. 5 To accommodate engine block misalignment and to reduce residual stresses imposed on the .

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