DS-3000 Frequently Asked Questions

The "velocity" measured by the Laser Doppler Vibrometer is differentiated once to convert it into "acceleration" and then calculated to display as "gravitational acceleration".
Here, we will set it to a three-screen display and show the value of "gravitational acceleration" on the graph in the third row from the top.

 

We will perform calculations on the second graph from the top (power spectrum of velocity) to obtain the power spectrum of gravitational acceleration.
The results will be displayed in the third graph from the top. Therefore, we will "select" the third graph.
Using the formula calculation function, we will perform first-order differentiation and calculations. After the calculations, the unit will be set to "G".

 

 

The third graph from the top is the power spectrum of gravitational acceleration.

 

 

※1 9.8 を 2回 割り算している理由

 

The power spectrum is a quantity that has the dimension of the square of a certain physical quantity (acceleration, velocity, displacement, etc.). When converting the unit of its value, it is necessary to handle the square of the conversion value. Specifically, when converting from m/s ² to G, it is necessary to divide by (9.8) ².

(Reference) The operation of FDIFF also multiplies by (2πf) ².
Using the DS-3000 impulse hammer (force sensor) and an accelerometer, I want to determine the mechanical impedance