Is it possible to represent the symbolic eqn in terms of other argument?

Forum|Forum|10 years ago
October 6, 2015
6 replies
2522 views

Hi, guys,

for the vibration, how to represent U/U0 in terms of r, where r is equal to w/wn, and wn=(k/m)^1/2, as the natural frequency?

Please see the attachment.

Thank you in advance.

May the force be with you!

Shawn

1_Assignment-3-mcdx.zip

Other

Best answer by RichardJ

I can't read your worksheet, because it's in Prime 3.1 format, and the picture is clearly not the entire worksheet, but you can rewrite your final expression using the substitute keyword. Since r=w/wn, w=r*wn. So use the substitute keyword with w=r*wn. You can then use the substitute keyword again, with wn=(k/m)^1/2.

Edit. Actually, just change you second line to be w:=r*wn. Then the final line should evaluate the way you want.

R

RichardJ

Answer

19-Tanzanite

I can't read your worksheet, because it's in Prime 3.1 format, and the picture is clearly not the entire worksheet, but you can rewrite your final expression using the substitute keyword. Since r=w/wn, w=r*wn. So use the substitute keyword with w=r*wn. You can then use the substitute keyword again, with wn=(k/m)^1/2.

Edit. Actually, just change you second line to be w:=r*wn. Then the final line should evaluate the way you want.