Test procedure…
Dynamic tests
In normal test operation, the cells are loaded in blocks with 1,000 flying hours (FH) each in 24 hour shift operation. Such a block lasts around a week. A 1,000 FH block includes 5 runs of a loading program which is equivalent to 300 simulated flights or 200 FH. The loading program itself consists of a sequence of 26,900 load cases. There are 2,011 different types of load case. Static tests
A strain survey is implemented at the end of each 1,000 FH block. The cells are loaded and then released in steps of 10% up to 70% of the maximum load in seven selected load cases.
…Measuring stages
The entire data acquisition is implemented with the HBK catman®Enterprise software.
Dynamic measurements
During dynamic tests, 200 measuring channels are permanently recorded with a frequency of 10Hz. A measurement series takes about 20 hours and includes the data from a 200 FH cycle.
This produces a data file with around 125 million measured values. This data is then processed in catman® with scripts.
While the test is running, all important test parameters are displayed online on the HBK server PC screen. Plots of interesting sensor data are also displayed.
…and static tests
We use the "Snap Shot" function for measurements during a strain survey. This means that when a specific load level is reached, all active switched measuring channels are measured and saved time-synchronized at the press of a button (about 1,600 measuring channels). A data file normally contains 99 measuring lines. The data is evaluated with catman® scripts once the measurement is complete. Important test parameters are also shown online on the Server PC screen during static measurements.