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How to choose a constant acceleration testing machine?

Date: Jan 21,2022 Views: 237

The national standard GB/T2423.15 clearly stipulates the purpose of the constant acceleration test: "It is used to determine the force (except gravity) generated by the components, equipment and other electrical and electronic products subjected to the steady-state acceleration (constant acceleration) environment, For example, under the action of running vehicles, air vehicles, rotating machinery and projectiles, whether the adaptability and performance of the structure are good, and evaluate the structural integrity of some components. The constant acceleration test can also be used to determine the effect of constant acceleration on microelectronic devices. Its purpose is to show structural and mechanical defects that are not necessarily detectable during shock and vibration testing. It can also be used as a high stress test to determine package, internal Structural strength limits for metallization and lead systems, die or back cover adhesion, and other components of microelectronic devices. It can be said that the constant acceleration test is a more scientific test loading procedure and specific operation method used to assess whether the product meets the above requirements and ensures that the test has a certain reproducibility.

 

At present, there are two common types of centrifugal constant acceleration testing machines, one is rotary table type, which is suitable for constant acceleration test of electronic components and microelectronic devices acceleration test.

 

With the development of military industry and science technology, there are more and more forms of constant acceleration tests.


 At present, the common non-standard centrifuges mainly include the following:

 

(1) High-speed self-rotating centrifuge: This type of centrifuge is driven by an electric spindle to achieve the required speed. Commonly used in centrifugal tests such as batteries and fuzes. According to different test requirements, it is roughly divided into 15,000 rpm, 20,000 rpm, 30,000 rpm and 50,000 rpm centrifuges. The load of such equipment is generally relatively small, and the geometric size of the test sample is also small.

 

(2) Dual-environment centrifuge: This type of centrifuge provides a revolution and rotation platform for the test product, that is, while the test product rotates, it revolves around a fixed axis of a certain radius, which is called a dual-environment centrifuge, and is also called a dynamic overload test machine.

 

(3) Centrifugal impact composite testing machine: This type of centrifuge is mostly used to simulate the real motion state of missiles or shells after launching, that is, the test sample can withstand sufficient shock acceleration overload while rotating at high speed, generally high-speed rotating centrifuges and high acceleration Composite test system composed of impact table.

 

(4) Centrifugal vibration composite test machine: This kind of centrifuge is an urgently needed environmental test equipment in the fields of geotechnical technology, earthquake simulation and aerospace. For example, when the spacecraft is orbiting the earth, when the aircraft is climbing, diving and circling, and when the strategic missile is in the active section and passing through the re-entry section, its internal equipment and devices are subjected to the compound action of acceleration overload and engine vibration. The basic structure is to load the vibrating table on the rotating arm of the centrifuge, so that the sample can be tested at the same time with the constant centrifugal acceleration during the vibration test.

 

In short, no matter what kind of constant acceleration centrifugal testing machine, its basic parameters are the same, as long as we understand its basic parameters, we can understand its overall function and performance.




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