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FEATURE TEST & MEASUREMENT


A NEW ANGLE ON vehicle stability testing


A wireless telemetry system is helping the Australian


Automotive Research Centre to accurately test vehicle stability. Kelly Voysey from Mantracourt explains how


update the measurement system, the company turned to Mantracourt. The company’s T24 wireless telemetry system not only offered ease of set-up and operation, which would be beneficial for the application, but being wireless it was more suitable for the environment, in particular because the operators have to perform tests in all weather conditions. T24 is a wireless telemetry system for multiple data acquisition in real time.


Once the vehicle’s wheels are positioned on the weigh pads, the table is tilted to 45˚ and the load monitored


A


t the Australian Automotive Research


Centre (AARC), a Tilt Table is used to test vehicle stability. During the test, a vehicle is driven onto the platform and the wheels positioned on weigh pads. The table is then tilted to an angle of 45˚ using four hydraulic jacks and the load on the weigh pads is monitored until it approaches zero. This means the vehicle is near its tipping point and the platform angle is recorded. Each weigh pad has four load cells,


one in each corner, that are connected to a single summing box that accepts inputs from multiple load cells and combines their outputs into one output. While the existing table at the site


was mechanically functional, however, the measurement system was out- dated and the load cells needed replacing and recalibrating. So, deciding it needed renovating, the AARC turned to Applied Measurement Australia.


UPDATING THE SYSTEM To start with, Applied Measurements Australia serviced and replaced the load cells, as necessary. Then, looking to


Time


Example of the test data collected by the system


30


13:18:17 13:18:18 13:18:18


Elapsed mS 500


1004 1578


In addition to the wireless load


measurement system, Applied Measurement also integrated six Accustar inclinometers onto six aluminium bars with magnetic feet. Each inclinometer was integrated with a T24-ACMi-VA which measures the returned voltage, which is proportional to the angle of the beam. Each beam was calibrated using a laboratory tilt table to ±45˚. A laptop computer was then equipped


with a T24-BSue (USB receiver base station) and Mantracourt’s logging and mapping software (T24LOG100). The inputs from the weigh pads and six inclinometers were configured into an on-screen representation so that they could be viewed and logged during testing. During testing the inclinometers were


mounted not only on the tilt bridge but also on the vehicle under test so that the angular difference between the tilt table and the vehicle could also be measured. This allows the user to see the effect of the suspension on different parts of the vehicle. All data from the test was logged


every second during testing to allow for analysis and compilation of a report to be given to the end customer. Throughout the project technical support was available from Applied Measurement Australia and from the UK based Mantracourt office. In addition a Mantracourt engineer was also available onsite to assist with initial setup and calibration.


The range comprises a versatile set of products, based around proprietary acquisition devices that can be mixed and matched to provide high quality remote readings for critical applications. The low power, battery equipped radio units allow data collection over many years without externally supplied power and so are considerably more cost-effective than hardwired systems, the company explains.


EQUIPMENT The solution was to connect each weigh pad summing box to a T24- ACMi-VA voltage acquisition module; and these were then mounted to the side of the tilt table. The weigh pads were then loaded with known weights and the T24-ACMi-VA’s calibrated to give an output in kg.


A NEW SOLUTION Mantracourt’s T24 wireless telemetry system is a versatile system for a wide range of applications, including those in harsh and rugged conditions. Since this application was completed,


the company has launched a new, upgraded version of the T24, with improvements including a 4x increase in transmission range, improved security features and smarter diagnostics. The complete system comprises a range of transmitters, interfaces, displays and output modules that can be simply and easily configured to suit individual applications. The transmitter modules have been designed to collect data from a wide range of industrial sensors – not just load but also pressure, torque, strain, temperature, pulse, potentiometer and 4-20 mA/0-10 V conditioned sensors.


Mantracourt T: 01395 232020


TILT 1 TILT 2 TILT 3 TILT 4 TILT 5 TILT 6 PAD 1 PAD 2 PAD 3 19.4 20 19.5 20 19.5 20


19.4 19.8 19.9 19.2 0.01 19.5 19.4


19.5 19.7


19.9 19.9


-0.01 -0.01


19.3 0.01 -0.01 -0.01 19.4 0.01 -0.01 -0.01


DEC/JAN 2016 | INSTRUMENTATION


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