KEYWORDS: Data acquisition, Human-machine interfaces, LabVIEW, Sensors, Time metrology, Control systems, Computing systems, Signal processing, Kinematics, Signal detection
Motorcycle crankshaft is a special rigid rotor. It is composed of crankshaft, connecting rod and slider. It belongs to
unbalanced rotor. Most of traditional methods of measuring unbalance value of crankshaft are not continuous, which
need human intervention. So the measurement time is long and measurement accuracy is not high. To solve the above
problem, a novel computer-based measurement is developed. The software of the measuring system is developed based
on G-language, namely LabVIEW. The hardware system includes accelerate sensors, multi-function Data Acquisition
(DAQ) card and industrial control computer. When the crankshaft rotates, its centrifugal forces are generated which
result in the supporting structure (also called vibration table) vibrating. Data acquisition, signal processing and analysis
can obtain unbalance value including amplitude and phrases. Computer-based measurement is used with software to set
up automated test system that can make fast measurements without human intervention. The application of virtual
instruments makes date analysis more accurate, and decreases the measuring time significantly; a complete measurement
can be finished in 25s. The results show that this new measuring system has the advantages of easy-of-use, high
precision, high efficiency and low costs.
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