FFT Applications
FFT Fluctuation · imbalance analysis
F-1-2 Imbalance correction of rotating object (field balancing)
- This example shows how to correct imbalance of a rotating object such as a fan or a roller at a certain rotating speed optimal for easy measurement of the imbalance. Imbalance appears as first order vibration of rotation. The HT-5500 detects the reflective mark attached on the rotating shaft to output the rotation signal and the NP-3414 built-in preamplifier type accelerometer installed on the bearing outputs the vibration signal. The DS-3000 series receives these signals and the DS-0227A analyzes them to measure the current imbalance status. Then another imbalance measurement is performed with a trial weight attached anywhere on the rotating object. The position and volume of imbalance are calculated using these two measurement data and appears on the screen. To correct the imbalance, attach a correction weight on the indicated position. Then perform imbalance measurement again for recheck. For this imbalance correction, "one plane-one condition correction", "one plane-two conditions correction", "two planes correction", etc. can be performed. If additionally the DS-0222A is used, resonant vibration etc. can be rechecked through tracking analysis.
Product list
| Model | Product name | Remarks | Qty | |
|---|---|---|---|---|
| 1 | DS-3000 series | Multi-channel Data station |
DS-3204 4ch Main unit DS-0321 FFT Analysis function DS-0323 1/1, 1/3 Real-time octave analysis function DS-0350 Recording function USB 3.0 Cable (2 m) |
1 |
| 2 | DS-0227A | Field balancing software | 1-plane 1-condition/1-plane 2-condition/2-plane 2-condition (rotational 1-speed/rotational 2-speed), applicable rotation speed: 150 to 40,000 r/min | 1 |
| 3 | NP-3414 | Accelerometer with built-in preamplifier | Compact, lightweight (3.5 g), frequency range: 0.8 Hz to 16 kHz ±3dB, resonant frequency: about 40 kHz | 1 |
| 4 | NP-0102 | Magnetic base | Mass: 10 g, adsorption power: 29.4 N | 1 |
| 5 | NP-0153 | Signal cable for magnetic base | 5 m, -25 to +160˚C | 1 |
| 6 | NP-0021 | Miniature//BNC conversion connector | Converts the NP-0153 signal cable terminal to BNC connector and input to the DS-3000 series BNC connector. | 1 |
| 7 | HT-5500 | Handheld digital tachometer | 5-digit LED, contact adapter (HT-0502), contact tip for rotation measurement (KS-300), circumferential ring (KS-200), reflective marks (12-mm square; 25 pcs.) 1 sheet, carrying case (included) | 1 |
| 8 | AX-501 | Signal output cable | For the HT-5500 rotation pulse signal (2 m) | 1 |
| 9 | HT-011 | Reflective mark | For the HT-5500 (1 sheet/25 pieces, 10 sheets/1 pack) (optional) | 1 |