### Re: Mistakes in Course Notes & HW Assignments

residual = m*a_new + c*v_old*v_new*v_new + k*x_new*x_new*x_new - sin(2*crntTime);

I'm thinking it should be:

residual = m*a_new + c*v_new*v_new*v_new + k*x_new*x_new*x_new - sin(2*crntTime);

I can't for the life of me figure out why v_old shows up in the residual of the mass-spring-damper problem.

residual = m*a_new + c*v_old*v_new*v_new + k*x_new*x_new*x_new - sin(2*crntTime);

I'm thinking it should be:

residual = m*a_new + c*v_new*v_new*v_new + k*x_new*x_new*x_new - sin(2*crntTime);

residual = m*a_new + c*v_old*v_new*v_new + k*x_new*x_new*x_new - sin(2*crntTime);

I'm thinking it should be:

residual = m*a_new + c*v_new*v_new*v_new + k*x_new*x_new*x_new - sin(2*crntTime);

ME751Chris wrote:I can't for the life of me figure out why v_old shows up in the residual of the mass-spring-damper problem.

residual = m*a_new + c*v_old*v_new*v_new + k*x_new*x_new*x_new - sin(2*crntTime);

I'm thinking it should be:

residual = m*a_new + c*v_new*v_new*v_new + k*x_new*x_new*x_new - sin(2*crntTime);

That's a mistake.

Also there is a mistake in the value of the acceleration at t_0.

i'll take care of them shortly and post here.

dan

Last edited by Anonymous on Wed Apr 14, 2010 6:33 am, edited 1 time in total.

I can't open mp3 files of Lecture 23, 24 & 20 on the webpage.

This is due to just technical problem?

This is due to just technical problem?

ME751Kyou wrote:I can't open mp3 files of Lecture 23, 24 & 20 on the webpage.

This is due to just technical problem?

For 20: i forgot to press the "record" button, so no audio.

23 and 24 will soon be available.

dan

Slide 8 of 4/13

The bottom most entry for phi_DP1 with respect to q, and then q again. Entries [4,1] and [4,2] should have both B's as transposed. This way they are 4x3 matrices.

The bottom most entry for phi_DP1 with respect to q, and then q again. Entries [4,1] and [4,2] should have both B's as transposed. This way they are 4x3 matrices.

This is right, thank you, Chris.

I edited the pdf and pptx to reflect this.

Dan

I edited the pdf and pptx to reflect this.

Dan

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