安全员的责任心演讲稿ppt..ppt

安全员的责任心演讲稿ppt.1610806946Engine rigid body behaviour
Modes are influenced by powertrain
Mass , C of G, directions of inertia axis
Modes are influenced by mounting system
Number and location of mounts, mount orientation, mount stiffness and damping
Six Natural modes can be expected
Fore aft (x) Lateral (y) Bounce (z)
Roll (Rx) Pitch (Ry) Yaw (Rz)
Some of these modes are often difficult to identify especially if 2 modes are virtually co-incident - . lateral (Y) in following example
Engine Bounce mode -
Engine fore aft mode
Engine roll mode
Engine pitch mode
Engine yaw mode
Engine Flexural modes
Generally more problematic on RWD installations
Bending mode usually sub 200Hz
System mass higher
Ideal mount position is on nodal points of bending mode to prevent energy transfer into body structure
Powertrain bending mode @ 138Hz