Okay, this lecture series is rather
complicated and not easy to understand.
But if you ask me what is your conclusion?
That I can say it follows mass law.
Or if you understand the mass law of finite plate,
or infinite plate, then you can use or understand this complicated cases.
One last thing I want to add on this summary is,
consider a situation that we have a plate,
but it is vibrating rather than oscillating like this.
Actually, this region represent how
transmission changes when we have a resonance of this system.
But what if we have a vibration like this?
If we have a vibration like this,
this is another type of resonance.
Then, what essentially happens is that
transmission loss will decrease with respect to many,
many different vibration nodes.
Therefore,
designing transmission loss thing
based on rigid body motion is very safe way
of anything designing the partition.
So, you can use mass law for example over here.
And to determine the transmission loss,
that determine the transmission loss is very safe.
So, this phenomena is a physically very interesting,
but in terms of designing aspect,
you really do not have to care about this complicated phenomena.