Recent content by marioooo

Hello, What does laplace transformation exactly 'do'? If I have PDE of second order and use LT on it, what do i get to solve? ODE? or if I have ODE of second order, what do I need to solve afet transformation? How does this work? is there any rule?!

thanks again, you were very helpful! :)

Thank you. That is the part I understand. But i don't understand how did they get expressions 4.81 and 4.82, because they are not same as 4.79 and 4.80. And those two (4.79 and 4.80) are from procedure you described. But those for stress are mistry to me. For example - how to get precisely 2...

Thank you for your time and answer. The thing is that i don't can see how can they get R and T for stress, because in 4.77. and 4.78. is already involved stress continuity, so don't know how did they get different R and T...

anyone? it's pretty urgent...otherwise i wouldn't be so annoying :(

OK, I think I'm starting to get it. But another thing is bothering me. This one is more exact. How did they get reflection and transsmission coefficient for STRESS. When they are doing it for velocity, they use continuity condition, but how to get coefficient for stress. Isn't that the same...

OK, the problem starts when they try to explain figure 4.5. I'm not sure how he can get solution just by going along z-ct, z+ct...

Thanks.

Hello, My question is about method of characteristics used in solving wave equation. I've found a book on dynamics of structures, and what I cannot understand is a part when it is talked about method of characteristic. Can somebody try to read the shoert article attached below and see if...