Real-Time Data Acquisition for Shock Absorber Testing
By: CAS DataLoggers
CAS DataLoggers provided the data acquisition and control solution for an automotive manufacturer using test systems to determine the dynamic characteristics and parameters of their line of shock absorbers (https://en.wikipedia.org/
The manufacturer installed an ADwin-Pro-ll System in a control cabinet located in their testing area. The modular, expandable Pro-ll system was suited for this application with its high channel capacity, flexible configurations and field bus interfaces, including Profibus, CANbus, and serial interfaces enabling use with a PLC. The Pro-ll formed an intelligent data acquisition solution performing online evaluation of measurement data, immediately after each sample was taken. The system also handled complex triggering conditions, high analog sampling rates, and freely programmable mathematical operations and functions including RMS values, min/max, mean, derivative, digital filters, and frequency domain signal analysis.
The modular daq system applied analog and digital stimuli to the shock absorber under test, using multiple channels of actuators and amplifiers. In addition to recording the stimulation, the response of the components was acquired by reading from the ADwin's analog and digital input channels. The system evaluated the response in real-time to immediately calculate how well the shock absorber under test matched the manufacturer's required specifications. The stimulation and acquisition could be performed over a very wide range of frequencies, from a few hundred hertz to several hundred kilohertz. By precisely timing stimulation, acquisition, and on-line evaluation, the ADwin system performed all tests and evaluated the data to accurately calculate the dynamic parameters of each shock absorber. The results were then sent to a PC operator interface connected via USB to display the test results.
Additionally, the ADbasic development environment allowed users to program mathematical operations and functions which were executed immediately after each sampling step, even at sampling rates as high as 20 MHz. The ADwin software (https://www.dataloggerinc.com/
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