local modes in gear
local modes in gear
(OP)
Hi
I have just given pinion gear for SOL 103 ( Modal analysis ) . I have wondered that I found local modes at the top of the gear. Top few elements having different modes when compared to others. What could be wrong ? Image is attched below
I have just given pinion gear for SOL 103 ( Modal analysis ) . I have wondered that I found local modes at the top of the gear. Top few elements having different modes when compared to others. What could be wrong ? Image is attched below





RE: local modes in gear
In your figure these elements are showing a mode of very low frequency (<< 0.5Hz) which I wouldn't expect. With the very few details you've given it's very difficult to offer any advice other than check your mesh.
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RE: local modes in gear
The pinion is hexameshed and ran 103 in nastran with steel as material property .It is just a free run , no SPCs or MPCs defined. But when I checked the results , few elements as you can see in the image behave in different manner and having different modes.
wht might be the reason?
I am sure that there are no coincident elements and all nodes are connected
thank you in advance