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Instrumentation of a rice combine harvester for instantaneous yield monitoring during harvesting
Dissertation Abstract:
A calibration test stand was successfully built and used to evaluate the accuracy of A microwave flow rate from 0 to 5.75 kg/s, and also to quantify the accuracy of the SWR SolidFlow microwave flow sensor for real-time measurement of grain flow under simulated laboratory conditions. The mechanical components of the calibration test stand include the frame, an auger-type conveyor system, and an elbow shaped chute unit housing with the SWR SolidFlow microwave type flow sensors, SWR M-Sen 2 microwave type moisture sensor, and ONO SOKKI MP-810 shaft speed sensor. The result indicated that the accuracy of microwave solid flow sensor was excellent (R2 = 0.9400) on pitch and roll angles at zero. The simulated combine harvester going downhill or uphill had a significant effect to flow rate. Measurement errors for pitch ascending ranging from 5.18 percent to 6.82 percent and pitch descending ranging from 2.50 percent to 3.68 percent were obtained by changing chute orientation level from 1.5° to 4.5°. Concurrently, measurement errors ranging from 1.8 percent to 8.86 percent were obtained by changing the roll angle, respectively. Generally, these measurement errors increased with an increase of slopes, but not for descending pitch. Conclusively, this laboratory test was able to quantify the measurement accuracy of the SWR SolidFlow microwave type flow sensor for real-time measurement of grain flow with the laboratory harvester test set-up.
