DS-3000 Frequently Asked Questions
Question number FAQ-0725
I want to determine the mechanical impedance using an impulse hammer (force sensor) and Accelerometer.
The frequency response function is measured using the force from the impulse hammer as the master and the acceleration from Accelerometer as the response.
The result obtained at this time is acceleration/force (acceleration).
Mechanical impedance is force/velocity, so it can be obtained by taking the reciprocal of the velocity after converting the acceleration to velocity through a single integral.
In the analysis settings, select single integral (1/jw) for frequency calculus, and turn on the "reciprocal calculation function" for frequency response function calculation.
The order of operations is to perform frequency differential and integral calculations first, followed by the reciprocal calculation.
Dynamic characteristics indicators
| definition | Japanese name | English name | Units (SI) | Turn on analysis function |
|---|---|---|---|---|
| acceleration/force | Acceleration (Inertance) | Accelerance （Inertance） | m/（Ns2） | - |
| speed/force | Mobility | Mobility | m/（Ns） | 1/jw (single integral) |
| Displacement/Force | Compliance | Compliance | m/N | 1/jw 2 (double integral) |
| force/acceleration | dynamic mass | Apparent mass | Ns2/m | 1/H (reciprocal operation) |
| force/velocity | Mechanical impedance | Mechanical impedance | Ns/m | 1/jw, 1/H (single integral, reciprocal operation) |
| Force/Displacement | dynamic stiffness | Dynamic stiffness | N/m | 1/jw 2, 1/H (double integral, reciprocal operation) |
Last updated: 2017-06-15