Development of real-time electro-pneumatic soil sampler
Başlık çevirisi mevcut değil.
- Tez No: 400269
- Danışmanlar: PROF. STUART J. BİRRELL
- Tez Türü: Doktora
- Konular: Ziraat, Agriculture
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2003
- Dil: İngilizce
- Üniversite: Iowa State University
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 100
Özet
Özet yok.
Özet (Çeviri)
An Automated Electro-Pneumatic Soil Sampling (EP) method based on pressurizedair for real time soil analysis was developed and tested in laboratory conditions. Pressurizedair was applied for 36 milliseconds across a 3 cm diameter cylinder to cut a soil column andconvey soil along a delivery pipe into a container. An electro-pneumatic regulator valve wasused to regulate the air pressure at 550, 690, and 830 kPa using an analog electrical signal. Atwo-position solenoid valve controlled by a stand-alone microprocessor was used to controlpulse duration. The effects of air pressure level, soil moisture content, soil compaction, andsoil type on the quantity of soil sample obtained were investigated. Moisture content andpressure level were found to be the most significant factors, while compaction was notsignificant in terms of mass of soil obtained. Laboratory test results showed that pressurizedair was effective in cutting and transporting soil sample for all different soils and differentsoil conditions studied in the experiment. The EP method was also capable of obtaining aconsistent amount of soil sample in a short time period (36 ms) with a coefficient of variationof less than 30 %. A shank as soil sampling arm was designed and constructed. The EPsystem was integrated with the prototype of soil sampling shank to develop a complete Real-Time Electro Pneumatic Soil Sampling System (REPS).The performance of the REPS system was tested during preliminary field tests, andthe performance was evaluated in a soil bin. The effects of traveling speed, soil moisturecontent, and pulse duration and pressure level on the amount of soil sample collected wereinvestigated. All the factors in the experimental design were found to be highly significant(?=0.05) on the amount of soil sample obtained. The amount of sample were predicted witha high correlation coefficient (R2 = 0.86). Sampling speed and precision would make theREPS be a strong candidate for real-time soil nutrient sensing system. Further performancetests of the REPS in broad range of soil type, soil compaction, and particularly soil moisturecontent were recommended. The traveling speed of sampling should also furtherinvestigated
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