USDA Subsurface Banding Implement Soil Trencher ImprovementsCritical Design ReviewCorp 10 – Fall 2010Christina LocklearAlex PetersonAlex ScammellPatrick SmythMatt TurbervilleOutline• Mission Objective• Architectural Design• Bill of Materials• Comprehensive Analysis• Questions“The Trencher”Direction of travelWay, Thomas et al. “Applicator System and Method for the Agricultural Distribution of Biodegradable and Non-Biodegradable Materials.” Patent 7,721,662 B2. 25 May 2010Mission Objective• Litter Application Component:“To improve or redesign the walls of the poultry litter implement so that litter can be more effectively distributed to the soil, mitigating the clogging that currently occurs during normal operation”• Dirt Recovery Component“To improve or replace the current press-wheel system used on the implement for dirt recovery so that the extricated soil is more effectively replaced over the deposited litter band”Architectural Design• Final ConceptArchitectural Design• Trencher WallArchitectural Design• Soil Recovery DeviceBill of Materials• Trencher Wall- Parts $ 38.40- Labor $ 70.00• Soil Recovery Device- Parts $ 54.06- Labor $ 140.00Grand Total $ 302.46Comprehensive Analysis• Trencher Wall Pressure Measurement• Trencher Wall ANSYS Analysis• Dirt Recovery Mechanism AnalysisTrencher Wall Pressure Analysishttp://content.honeywell.com/sensing/sensotec/pdf_catalog08/008602-1-EN_Model_F.pdfTrencher WallTrencher Wall Pressure Analysis-10-5051015202530354045752 753 754 755 756 757 758 759 760 761 762 763 764 765Pressure (psi)Time (s)Oktibbeha Clay Soil, First Run(PASS1.ASC. Data collected 11/5/2010)P1_FrontP2_2ndP3_3rdP4_Rear1234Trencher Wall ANSYS AnalysisMesh• Brick 8Node45 Tetrahedral Boundary Conditions• Structural Displacement• Pressure on Bent AreaPressure• 15 and 30 psiTrencher Wall ANSYS AnalysisResults• 15 psi → 0.091 in deflection• 30 psi → 0.202 in deflectionPreliminary Analysis• Dirt Recovery Mechanism FBD AnalysisTRENCHER WALLComponentF21FGFFFWR Fx= max Fy= 0 MCB= 0Use MATLAB to solve force equations and find shear stress on pivotsFBFT212F12Conclusions• Redesigned Trencher Walls – Increase thickness to ¼ inch, flare outward at 10 degrees– As proven by ANSYS, deflection will not inhibit poultry litter flow• Soil Recovery Component – Maximum shear in pivots is 14 lbs– Materials chosen are sufficiently strong for intended
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