Accelerometer installation method--accelerometer installation surface requirements and accelerometer installation position selection principle
In an ideal environment, the acceleration sensor should be installed to provide the entire transfer zone. Although every analyst hopes to achieve this excellent goal, its implementation depends entirely on the installation method used. Keep in mind that the natural frequency of an accelerometer is related to hardness and quality. Any installation that affects the characteristics of these sensors will change the natural frequency.
In order to accurately measure vibration, the user must ensure the following guidelines:
1. Acceleration sensor installation does not limit the useful frequency and vibration range.
2. The additional mass of the acceleration sensor does not change the vibration characteristics of the vibrating object.
3. Accurate and repeatable fixed measuring points, which ensure that the measurement can be repeated.
Below we will detail the specific installation method and precautions for the acceleration sensor.
First, the processing requirements of the installation surface of the vibration test equipment.
In order to obtain a higher installation resonance frequency, it is very important to test the sample surface as clean and smooth as possible. If possible, try to achieve the processing requirements shown in Figure 1-1. The stud bolts used for the acceleration sensor installation are also to be tapped by the thread standard shown in Figure 1-1. Useless sludge can be washed away with a solvent such as acetone.
Second, the accelerometer installation location
In many cases, the mounting position of the accelerometer is very obvious and the requirements for vibration measurement can be installed. The accelerometer should be installed so that its primary sensitivity axis is in line with the measured vibration direction.
A position is selected such that the vibration transmission path from the position to the vibration source is short and rigid to avoid any flexible transmission and the occurrence of a damping type element such as a gasket in the structure to be tested. For example, when measuring the vibration of a rotating machine, the bearing housing is often the best place to mount the acceleration sensor.
Valuable vibration information is often found on the axial, horizontal and vertical axes. The X, Y, Z axial test system can be used to obtain vibrations on three mutually perpendicular axes at the same point using a three-axis acceleration sensor or by using three uniaxial sensors with a three-axis mounting base. information. [In some large vibration equipment bearing housing ends, three single-axis accelerometers can be installed to measure the amount of vibration in the X, Y, and Z axes. ]
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