Vibration barriers
Vibration barriers refer to problems caused by vibration during processing, inspection, and measurement. Vibration obstacles will have a significant impact on machining accuracy, quality, and inspection results, so it is necessary to select and implement appropriate vibration elimination and anti-vibration products. The main vibration obstacles are as follows.
| Precision and quality |
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| Inspection and measurement |
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Vibration failure status confirmation
will be in the case of vibration failure, strictly check the situation of the relevant problem, including when and under what circumstances the problem occurred, and the relationship between the equipment and the vibration source of the problem, and the vibration frequency, etc. Wait. In addition, we will consider whether to deal with faulty equipment and vibration sources.
Focus
on the failure equipment and vibration source, it is best to reduce the basic information of the equipment (manufacturer, equipment name and model), total weight, number of support points, shape, layout and load distribution (center of gravity), moving load, load Change, rotation speed, frequency, presence or absence of vibration countermeasures, shaking, damping, vertical/horizontal, etc.
Key points for product
selection When selecting the correct vibration damping and anti-vibration products, focus on the three characters of “vibration frequency”, “load”, and “function and shape”. The natural frequency of anti-vibration and anti-vibration products is based on 1/2 of the vibration frequency and the load must be within the load range. In addition, the best product will be selected from different types of functions and shapes (ie), namely: base, pad, embedded (installed).
The product selection example
takes the anti-vibration measures of the compressor as an example to introduce the method of selecting anti-vibration and anti-vibration products.
1. First select the shape of the product. In this example, we consider “foot type”.
| Pump speed | Example) 2400rpm |
| Body weight | Example) 1000N (about 100kg) |
| Foot count | Example) 4 |
2. Formulas are used to derive “vibration frequency” and “load” to determine the selected reference value.
The resonant frequency (or natural frequency) of the vibration-damping products that are mainly used is the standard of vibration-proof and vibration-proof vibration frequency of 1/2 or less, so it is appropriate to choose a load of 250N (0.25kN) below 40Hz/2=20Hz .
3. Specifications—According to the price list and “resonance frequency curve (characteristic data)”, we will look for products with an allowable load of 250N (0.25kN) and a resonance frequency (or natural frequency) of 20Hz or below. In the case of the following table, we found that the places listed in the box are applicable
Precautions when formulating measures
1. The center of gravity is high,
especially in the case of a device with a high center of gravity. The skew and shaking of the device may increase and cause failure: there is a way to use an anti-vibration platform to ensure that the center of gravity is at a lower position .
2. When the load is too light and the
load is too light, the performance of the easy damping and anti-vibration products cannot be exerted. According to the following chart and formula, it can be concluded that the heavier the load, the smaller the F0 obtained, which will shift like the solid line, and vice versa, it will shift to the dotted line. When the crossing point of the vibration frequency and the waveform graph is above 0, not only the anti-vibration effect cannot be obtained, but the vibration will be released due to resonance.Therefore, when selecting a vibration damping or anti-vibration product, make sure that the mass of the damping object is within the “allowable load range”.
