TEST, SAFETY & SYSTEMS
AUTOMOTIVE SAFETY EVALUATION IABG’s test rigs involved in automotive safety testing include the HyMAS (Heavy Multi-Axial Shaker), a multi- axis vibration rig for earthquake simulation and fatigue strength evaluation of heavy objects weighing up to 14 tonnes. In contrast, the LiMAS (Light Multi-Axial Shaker) is a multi-axis vibration test bench with combined environmental simulation for specimens up to 1,000kg, used in evaluating the environmental impact of objects or wind gusts. IABG’s single-axis vertical vibration
test bench SILAS-V (Single-Axis Shaker Vertical) helps verify the fatigue strength of mass-excited parts and components of up to 500kg under vibration loads up to 80m/s2
,
in a 0.5-200Hz frequency range, at temperatures from -40°C to 120°C. Finally, the vertical dynamic structural test bench VESPA is used in the comprehensive, combined testing and analysis of overall vehicle safety and reliability.
LOW-NOISE DENSITY FOR SEISMIC ACCURACY “Across our test rigs, we analyse the impact of acceleration forces from less than 1m/s2
load all the way up to 2,000m/s2 continuous vibration peak
acceleration,” Simon says. “These high- precision sensors register dynamic (AC) and constant, static accelerations (DC) and thus operate from nearly 0Hz.” The triaxial capacitive low-noise
(LN) accelerometers of the ASC 5711LN series, which are specially configured to meet the needs of the various applications at IABG, have very low noise density even in high measuring ranges of +/-200g. In combination with the MEMS-based sensors’ excellent response behaviour, this leads to feasible resolutions of only a few millionths of gravity (µg).
COMPLEX VEHICLE TESTS In difficult off-road conditions on test tracks, for example, truck or commercial vehicle brakes can be
The LiMAS multi-axis vibration test bench
subjected to up to 90 times the acceleration of gravity. Using ASC sensors, the SILAS-V test bench can simulate similarly extreme loads. The test is carried out using purely vertical accelerations of a maximum of 600m/s2
to precisely analyse
components weighing up to 40kg. In the context of modern mobility
concepts, design requirements for vehicles are becoming increasingly demanding. Reliability and safety are crucial for increasingly complex vehicles and their growing range of functions. IABG’s VESPA test bench evaluates and ensures these parameters for vehicles of all kinds of drives. The VESPA combines test types of
operational stability, fatigue, vibration and noise analyses of vehicles with conventional and electric drives. Customers can choose from a wide range of services to be individually tailored, from fatigue strength tests on car bodies and motorcycles to the monitoring of electric vehicle behaviours, noise interference analyses and the simulation of ageing processes for vehicle components under harsh climatic conditions, as well as solar simulation or the impact of simultaneous exposure to vertical vehicle excitation.
STABILITY AND LONGEVITY “Most of our applications are in the range up to 200Hz. For this, we use a sampling rate of over 2kHz to be able to record all relevant data,” Simon explains. The sensitivity of the sensors used played a major role here. “The DKD calibration capability of ASC’s sensors is also critically important for us as an accredited laboratory.” This also applies to the operational
stability of the sensor technology in use. “ASC sensors’ easy handling and installation, their lightweight but robust housing, flexible usage between our test benches and DKD calibration are decisive advantages. As we aim for good availability of our test rigs, sensors of high accuracy with a long, stable service life are of the essence,” Simon concludes.
For more information visit:
www.asc-sensors.de
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www.engineerlive.com
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