Measure and Controllability of Environmental Conditions of Plum-shaped Elastic Coupling

Time: 2012-07-07 08:06 Author: XINLAN Coupling Click:
Measure and Controllability of Environmental Conditions of Plum-shaped Elastic Coupling

 

 
1. The measurable and controllability of environmental condition parameters
The environmental conditions provided by any environmental test equipment must be observable and controllable. This is not only to limit the environmental parameters within a certain tolerance range, but also to ensure the reproducibility of the test conditions. And repeatability requirements, and it is necessary to start from the product test, in order to prevent the environmental conditions from being out of control and causing damage to the tested product and causing unnecessary losses.At present, various test specifications generally require that the accuracy of parameter testing should not be less than one-third of the error allowed by the test conditions.
2. Reproducibility of environmental conditions
It is impossible to achieve a complete and accurate reproduction of the environmental conditions existing in nature in the laboratory.However, within a certain tolerance range, people can accurately and approximately simulate the external environmental conditions experienced by engineering products during use, storage, and transportation.This passage is summed up in the language of engineering, that is, "the environmental conditions surrounding the tested product (including the platform environment) created by the test equipment should meet the environmental conditions and tolerance requirements specified in the product test specification."For example, the temperature box used for the test of military products must not only meet the requirements of the national military standard GJB150.3-86 and GJB150.4-86 according to different uniformity and temperature control accuracy.Only in this way can the plum-shaped elastic coupling guarantee the reproducibility of the environmental conditions in the environmental test.
3. Repeatability of environmental conditions
One environmental test equipment may be used for multiple tests of the same type of product, and a tested engineering product may also be tested in different environmental test equipment, in order to ensure that the same product is tested in the same test specification. The comparability of the test results obtained under the conditions inevitably requires the repeatability of the environmental conditions provided by the environmental test equipment.That is to say, the stress level (such as thermal stress, vibration stress, electrical stress, etc.) applied by the environmental test equipment to the tested product is consistent with the requirements of the same test specification.The reproducibility of the environmental conditions provided by the environmental testing equipment is guaranteed by the national metrological inspection department after passing the verification in accordance with the verification regulations formulated by the national technical supervision agency.To this end, environmental testing equipment must be required to meet the requirements of various technical indicators and accuracy indicators in the verification regulations, and the use time does not exceed the time limit specified in the verification cycle.For example, a very common electric vibration table must not only meet the technical indicators such as excitation force, frequency range, load capacity, etc., but also meet the requirements of accuracy indicators such as lateral vibration ratio, table acceleration uniformity, and harmonic distortion specified in the verification regulations. , And the use period after each verification is two years, more than two years must be re-verified before it can be put into use.
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