Modal Theorical FAQ

I ran one test with an x-excitation and can see some modes and another test with a y-excitation and see some different modes could I use an oblique angle instead ?

When impact testing, can the use of the exponential window cause any problems?

What's the difference between a complex mode and a real normal mode?

Is it really necessary to reject a double impact?

Do I need to have an accelerometer mounted in the X, Y and Z directions to do a modal test?

Could you explain the difference between time domain, frequency domain and modal space?