How to ensure the accuracy of dynamic measurement

Axial signal acquisition and dynamic axlebox temperature measurement The collection of infrared heat radiation energy of the axlebox is carried out under dynamic conditions. It is a non-contact dynamic measurement. The value of the axlebox temperature in operation is increased to increase the infrared axle temperature detection technology. A new research topic. From the principle of infrared thermal radiation analysis, the main factors affecting the accuracy of shaft temperature dynamic setting.

(1) The heat exchange between the infrared heat radiation of the axle box and the infrared component includes three heat exchange modes of heat conduction, heat convection and heat radiation, and the process is extremely complicated. For infrared devices, the heat flow fluctuation directly forms the temperature fluctuation of the response element, wherein the heat conduction causes the heat flow fluctuation to be much larger than the heat radiation, resulting in a change in the spectral response and the detection rate.

(2) The basic characteristic parameters of various infrared components are parameters under specific test conditions and definitions. In the infrared dynamic detection, due to the different thermal (optical) electrical conversion mechanism of the infrared components, the working modes and characteristics of the components, various The temperature factor, as well as the reference, background noise, dispersion of similar component parameters, specific emissivity, etc., the component characteristic parameters have become variable parameters.

(3) From the control theory, it is possible to carry out the advance compensation control, but there are certain conditions and limits in the actual control process, especially in the infrared temperature measurement, such as invisible factors.

(4) At present, the single-point infrared component collects only the infrared radiant heat of the bearing under the basic equivalent detection condition, and can not reflect the thermal characteristics of other parts during the bearing operation.

(5) The detection values ​​of the reference point of the shaft temperature dynamic setting, the ring temperature, the modulating disc, the switch door panel, etc. are all relative values ​​and have great randomness.

It can be seen that in order to achieve a static and dynamic in the real physical sense, the axis temperature is more consistent and accurate. When designing the fixed-temperature infrared hot-axis detection machine, it must be fully considered from the perspective of infrared thermal radiation mechanism. The solution is determined according to the level of accuracy that can be achieved.