Backhoes are widely used machines with hydraulic shovels and buckets operated by mechanical controls. That combination can give rise to some unexpected vibration problems, according to a recent study by UC Davis mechanical engineering professor Don Margolis and Taehyun Shim, assistant professor of mechanical engineering at the University of Michigan.
In some backhoe designs, a small movement of the mechanical controls leads to a rapid vibration that shakes the vehicle so hard the operator cannot hold the controls. The mechanical controls open valves in the hydraulic systems that move the bucket and shovel.
That shaking is caused by positive feedback between the hydraulic and mechanical controls, Margolis said.
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