Precise calculation models are important - but how reliable are they without real tests?
Our robust LTT24 in an action-packed field of application.
Mathematical models are becoming increasingly important - and increasingly precise - for checking the strength of mechanical structures. However, occasionally real checks of the calculated strength analyses are essential in order to verify the reliability and accuracy of the mathematical models.
With increasing computational accuracy, ever more precise and broadband data acquisition devices are required to make the fine details of the structural analyses tangible in real tests.
The limits of the calculation models have long been established for small loads on the mechanical structures. However, with larger excitations, such as in crash tests or - as shown in the picture - in the case of blasting, the structures to be tested are deliberately stressed to the load limit or even significantly beyond in order to detect non-linearities and calculation deviations.
The measurement technology to be used must be able to withstand these enormous loads and at the same time record the measurement signals from a wide range of sensors with maximum precision and without distortion - because most tests of this type cannot be repeated without high costs...
It is often astonishing to realise that despite the huge low-frequency ‘boom’ components, the real structural fatigue and/or cracks occur due to the vibration superimposition of many very high-frequency signal components. The problem with such high signal frequencies is their very small amplitudes, which roughly decrease with 1/f and are superimposed by the huge amplitudes of the low-frequency ‘boom’ for all sensory perceptions and thus remain invisible.
The high-precision, broadband and extremely low-distortion input stages and AD converters of the LTT24 and LTTsmart measuring devices from Labortechnik Tasler GmbH are highly optimised for precisely these applications.
With a sampling rate of 4 MHz per channel and 24-bit resolution, they offer the same accuracy and bandwidth that can be used directly in the real test field for measurements with ICP, strain gauge, charge, current and voltage sensors.
The LTT24 also offers the option of an internal SSD, which reliably stores all active channels continuously at full sampling rate and can output them again for later analysis.
Software interfaces to various data processing programmes such as MATLAB and Phyton are integrated.
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