Multi-frequency synthesized vibration test device

Abstract

The invention discloses a multi-frequency synthesized vibration test device. The multi-frequency synthesized vibration test device comprises a system controller, a motor, a speed adjusting device and a vibration platform, wherein the vibration of the vibration platform at least comprises the vibration of two frequency components; the vibration of each frequency component is generated by an eccentric rotation mechanism with different rotating speeds; multiple vibration is synthesized through a mechanical lever in a pair combination mode; the vibration of each frequency component represents one section of frequency range in a transportation vibration environment; when the rotating speed of the motor is adjusted, each vibration frequency component performs synchronous variable frequency scanning in the frequency section represented by each vibration frequency component; a vibration device can perform fixed frequency and variable frequency tests on samples; the simulation degree of the vibration device on the transportation vibration environment is similar to that of a random vibration test; the vibration device is the optimized combination of two schemes of sinusoidal vibration and random vibration; and after two vibration platforms with complementary phase positions are provided, the influence of the test device on the ambient environment is reduced.

Description

technical field [0001] The invention relates to a vibration test device, in particular to a multi-frequency synthesis vibration test device mainly used for the vibration test of commodity transport packages. Background technique [0002] Vibration test is one of the commonly used items in the performance test of commodity transportation packaging. It tests the shock absorption performance of packaging by simulating the vibration environment that affects the safety of goods during the transportation of goods. Existing vibration tests for transport packages can be divided into two types: sinusoidal vibration tests and random vibration tests. [0003] Among them, the sinusoidal vibration test uses a vibration source such as a crankshaft or an eccentric rotating mechanism to excite the vibration table. This type of vibration system has a simple structure, stable and reliable vibration output, and low test cost. But this vibrating table can only vibrate at a single frequency at ...

AI Technical Summary

Problems solved by technology

However, the vibration signal of the random vibration test system is relatively complex, and the output is easily affected by the load. The diversity of the vibration mechanism makes the comparability of the test results between the systems low, and the high equipment investment and operation and maintenance costs lead to an increase in the test cost.

Therefore, the random vibration test of the transport package has not been promoted because it made up for the shortcomings of the sinusoidal vibration test

[0005] In addition, the existing vibration test system has only one vibration platform, and the vibration has a great impact on the surrounding environment when working (especially when the mass of the test piece is large and the operating frequency is high).

[0006] Summarizing the characteristics of the above two types of vibration tests, it is found that: sine vibration generally only needs open-loop control, which is simple and intuitive, and the vibration output is accurate and reliable and easy to implement. The actual vibration state is quite different, similar to using a straight line (or a straight line with variable slope) to fit a random process, and the accuracy is low

The random vibration uses continuous frequency spectrum to fit the circulation vibration environment, which is more consistent with the actual vibration state. It is similar to using a high-order function curve to fit a random process. The fitting accuracy is high, but the disadvantage is that there are many variables and a closed-loop method is required. Control, large differences between different equipment, high test cost

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