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African Petrochemicals is South Africa’s leading bi-monthly print and digital trade magazine for the past 15 years. Featuring all the latest petrochemical industry news, special reports, technological advances etc.

OSCILLATING BEAM RIG TESTS LOW FREQUENCY SENSORS

Accelerometers and velocity meters are used to measure a wide range of frequencies, including low frequency vibrations found in building maintenance. They occur at less than 2Hz, and can also be useful in monitoring bearing wear in cooling tower fans and gearboxes for example.

To characterise the performance of its low frequency sensors in that range, which is too low for most test shakers, Monitran, locally represented by Instrotech, has developed a new high displacement test rig that can generate oscillations accurately at frequencies as low as 0.2 Hz. The system allows real-time back to back testing between different devices and its own inbuilt, calibrated MEMS sensors.

The horizontal linear beam oscillator has a powerful motion control system that incorporates a precision AC servo with 17 bit encoder feedback. Running on two precision rails, it uses magnetic springs and magnetic damping to ensure smooth operation. Its software produces fast code, at 1.7 milliradians per step, which generates fine sinusoidal motion for the linear track driven by a rotary motor.

oscillating-beam-rig-tests-low-frequency-sensors

The intelligent shuttle, which can carry a sensor payload of up to 0.5 kg, incorporates seven MEMS accelerometers, signal processing and a microcontroller to monitor its motion. It also includes a mechanical low pass filter and has an operating distance of up to 1000mm, exerting up to 8g acceleration to the devices under test. That amounts over 35 kilometres per hour peak velocity, down to nearly 1/20th of walking speed.

“The new oscillating beam rig gives us accurate extreme low frequency data and is a highly useful addition to our accelerometer test and calibration capabilities,” said Andy Anthony, Monitran’s managing director.

For more information on Monitran’s oscillating beam rig for accelerometer test and calibration, contact Instrotech on 010 595 1831 or sales@instrotech.co.za

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