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High-Pressure Cylinder Test for Airbag Inflation

2016/04/18

Project

The basic idea of airbags is that when a car is involved in a collision, steel cylinders filled with highly compressed gas rapidly inflate airbags in the center of the steering wheel, the dashboard, and sometimes other places, to cushion driver and passengers, reducing and preventing injuries. A high quality automotive airbag system cannot ignore the quality of the reservoir cylinders, because if a cylinder were to burst, the high velocity gas might project cylinder fragments into the surrounding areas as well as people and cause significant injuries. 

Nations worldwide have currently established standards associated with the manufacture, quality, and testing of these high-pressure cylinders. Therefore, it is now absolutely necessary to use a professional airbag high-pressure steel cylinder testing machine during the production process to conduct the relevant tests for the cylinders in order to ensure their quality and safety.

Requirements

The various types of steel cylinders must undergo the relevant cylinder verification tests during the manufacturing process. Among them, the two most important are the fatigue and burst tests.

- The fatigue test must be able to conduct continuous tests by automatically adding and reducing pressure by pre-configured amounts.

- The system must be able to record the testing data and calculate the relative pressure and time curves.



System Features

Advantech provided a series of products to perform high-speed pressure and flow volume measurements as well as equipment control for this application case. In Advantech’s industrial-grade 4U rackmount IPC ACP-4020 chassis with AIMB-785, the 6th/7th generation Intel® Core™ i motherboard was used in combination with the PCIE-1810 to perform rapid data acquisition, with instant display of collected information on the human-machine interface, along with analyses, recording, report generation, etc. 

In order to obtain accurate pressure data based on customer requirements, the PCIE-1810 in the industrial-grade computer was a high-speed analog input card that captured the changing pressure signals rapidly and continuously. Its 500Ks/S high-speed sampling rate and 12-bit high resolution performed rapid data acquisition 100 times faster than that of a PLC. When the test machine performs a pressurization and decompression fatigue test 10,000 times on a steel cylinder, the PCIE-1810 operates at a sampling rate of ten thousand times per second. This significantly enhanced sampling rate captures the changing pressure signals rapidly and continuously, thereby resolving the customers’ PC/PLC data distortion problems.

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