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Motion Measurement on Rear Swinging Fork

The video shows the application of a stereo image correlation (phase synchronized) for a three-dimensional displacement measurement or movement analysis (Vic-3D).

The used stereo camera system is based on two 5 Mpixel cameras with a frame rate of 6Hz (at full resolution) in combination with the isi-sys synchronisation and trigger device for stroboscopic opservation of periodic events.

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Four measurement areas (hydraulic cylinder – below, wheel hub – left, swingarm – middle and linear unit – right above) with specle pattern were monitored for the evaluation. The vector arrows represent the current displacement state.

 

Vibration Analysis of a Brake Disc

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Automobiles are subject to many forces using operation. Vibrations from the engine or the road-surface transmit through the vehicle’s chassis and suspension to the most essential mechanical component of the vehicle, the brake system.

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In this example, a 14” diameter brake disc from a heavyduty truck was excited using a small hammer to measure the vibration shapes of the rotor. The three-dimensional operational deflection shapes were easily identified and measured using the Vic-3D™ HS Vibration Analysis System. Amplitudes as small as 40 nanometers were measured at a frequency of approximately 2,000 Hz.

 

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Exhaust1The engineers at Cummins design and test their engines to withstand real-world conditions, ranging from military deployments to heavy-duty industrial sites. Cummins engineers want to know exactly how their parts are deforming under the combination of thermal and mechanical loads. This means they’ve got to perform their tests with the engines running – and hot.

Because of the complex strain fields produced under these conditions, conventional gauges cannot satisfy Cummins’ requirements. FEA simulations are also limited, due to the uncertain boundary conditions. With the Vic-3D system, Cummins engineers are able to obtain detailed three-dimensional strain measurements. These measurements are made under real loading conditions while the engine is running. In addition, the Vic-3D system is easy to set up and can measure both small parts and large assemblies.

 

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Paul Gloeckner, senior research engineer at Cummins, explains the usefulness of the Vic-3D system as follows: “This tool allows us to make measurements that were previously not possible. It has also allowed us to considerably reduce the time required for these tests.”