In sinusoidal vibration testing, interruptions can occur due to various reasons. Handling these interruptions properly is crucial to ensure the validity and reliability of the test results. This article outlines the special requirements for processing interruptions in both sinusoidal fixed-frequency and swept-frequency vibration tests.
1) Interruption processing of sinusoidal fixed-frequency vibration test
The theory that vibration test causes product failure believes that the mechanism of vibration influence is cumulative damage. In sinusoidal fixed-frequency vibration test, if the interruption is not caused by product failure, and the test process before the interruption point meets the requirements of the test conditions (values and errors of technical indicators such as amplitude and frequency), the test time before the interruption point is valid, and the test can be continued from the interruption point until the test time requirements are met.
2) Interruption processing of sinusoidal swept-frequency vibration test
Since the theory that vibration test causes product failure believes that the mechanism of vibration influence is cumulative damage, cumulative damage of vibration has occurred during the sweep process that has been carried out in a swept-frequency vibration test. If the test process before the interruption point meets the requirements of the test conditions (values and errors of technical indicators such as amplitude and frequency), the swept-frequency test before the interruption point is valid. The swept-frequency test that follows the interruption should not “start over” from the starting frequency point of the swept frequency, which will increase the total number of vibration tests and thus increase the possibility of cumulative damage. The problem is how to continue to implement the unfinished sweep test from the interruption point during the actual test without affecting the subsequent sweep cycles that have not yet been carried out.
A.If the sinusoidal vibration test control system has the function of interrupting and stopping during the sweep test, it can continue to implement all the unfinished sweep cycles of the subsequent sweep test from the interruption point after the interruption. Then the interruption of the sweep cycle test can be handled in accordance with the interruption handling method of the fixed-frequency sinusoidal vibration test.
B.If the sinusoidal vibration test control system does not have the function of interrupting and stopping during the sweep test, it is necessary to start from the interruption point and manually set the unfinished sweep cycle program. After waiting for the sweep cycle test to be completed separately, set the unfinished sweep cycle program and the number of sweep cycles, and then start the sinusoidal vibration test automatic control system to complete the subsequent number of sweep cycles.
By adhering to these special requirements, the integrity and accuracy of sinusoidal vibration tests are maintained, ensuring reliable results even in the event of interruptions.