Thinking this over, I can agree.
- Attenuation means that energy is “drained” in the system, e.g. by dampers or in our case lack of stiffness
- Higher stiffness of the entire system / frame means that more resonance energy is seen by the IMU
- PSD thus gets higher
Back to @LifeOfBrian printer:
Printer y-axis:
- The basic form of the graph looks OK
- The big Z component looks a bit fishy, although some Z portion is normal
- Could be an effect of the IMU mounting
On a bed slinger the IMU is mounted on the bed. How did you do this? Did you mind directions as noted on the IMU’s silk screen?
Printer x-axis:
- This graph looks like a mechanical problem
- For comparison see the following two graphs. The first one is always the messed-up axis (binding) and the second one the proper:
Modified Ender 5:
Custom corexy easily capable of accels > 20k
- Take note of:
- Very low PSD of the messed-up axis
- Broad frequency spectrum of resonances of the messed up axis