GPRS應用於動力撒佈機流量之監控

Abstract

本研究將GPRS/GPS無線定位傳輸系統與一台背負式動力撒佈機做結合，建立一個遠端即時監控系統，透過無線定位傳輸系統將當時操作者行走之路徑軌跡與撒佈機之施噴流量，即時傳回至監控站。 整個實驗分為三個階段：第一階段進行GPRS/GPS無線定位傳輸系統實測作業，第二階段進行風速計與背負式動力撒佈機連結實測作業，第三階段則進行無線定位傳輸系統與風速計整合在背負式動力撒佈機實測作業。 實驗結果顯示，不論是採用步行或是騎乘腳踏車模擬自走式車輛搭載撒佈機行駛的方式，在不同速度進行小範圍或是廣域範圍測試，若天候狀況良好的情況下，GPS很快即可接收到訊號，且定位所造成的誤差在5公尺以內。 另外，撒佈機之油門位置是影響流量大小的關鍵，油門位置1時，所測得的平均風速約20.8 m/s，換算流量約為0.053 m^3/s ，其流量值為最小;而在油門位置5時，所測得的平均風速約77.4 m/s，換算成流量約為0.197 m^3/s，其值為最大。 最後，本研究已能在遠端電腦進行即時的GPS定位監控與遠端操控，監控端接收到當時的經緯度座標值和撒佈機之流量，若施噴位置有誤差或流量過大或太小，監控端操作人員即可馬上輸入指令觸發蜂鳴器，在第一時間警示撒佈機操作人員進行修正。

This study integrates a power spreader with the GPRS/GPS technology and establishes a remote monitoring system. The system can receive the operator’s moving tracks and the power spreader’s flow rate and also transmit these data to a remote monitoring station through GPRS immediately. The entire experiment was divided into three stages: In the first stage, GPRS/GPS wireless positioning system was tested. Then the connection between an anemometer and a power spreader was done in the second stage. Finally, the wireless positioning system and the anemometer was integrated for a power spreader in the third stage. The experimental results showed that no matter what methods of test (by foot or with bicycle) are used under different moving speeds or distances are, the GPS can receive signals quickly under a good weather condition .The maximum deviation is within 5 meters. In addition, the fuel throttle on a power spreader has an important influence on the flow rate. The average velocity is 20.8 m/s and the minimum flow rate is approximately 0.053 m^3/s when the throttle level is 1, while the wind velocity is 77.35 m/s and the maximum flow rate is approximately 0.197 m^3/s when the throttle level is 5. This study has also set up a transmission for wireless positioning system. A remote monitoring system can receive signals from the coordinates of a power spreader and its corresponding flow rate in the spreader’s deliver pipeline output immediately. If a position of a spreader or the flow rate was not correct, the monitoring site can send a warning signal to the operator and caution the operator to correct his moving path or adjust the flow rate in time.