2907

2610

كارشناسي ارشد

مكانيك ماشين هاي كشاورزي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده كشاورزي

1383

نوزده، 128،[II]ص.: مصور، جدول، شكل، نمودار

جليل رضوي، عباس همت

محمدرضا فروزان، امين اله معصومي

جهانگير عابدي، حسن خادمي زاده

1396/10/23

كتابنامه

كشاورزي

مهندسي كشاورزي

ID2610

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

I r I Abstract Green forage preservationas a source of all seasonsfeeding substanceis made possible by harvesting fresh crop by a forage harvesterwhich chops the material in small pieces and then is stored holding silos through compressing it by heavy machinery Silage removal as a daily activity in a dairy farm is usually handled by heavy machinery such as front end bucket This results in the destruction of the silo s frontal walls due to excessiveaerationreducesthe quality and its feedingvalue A desilaging machine was designedand its prototype was constructed to over come this problem Static and dynamic forces and torques exerted on the cutter main shaft were determined Design considerationswere included material capacity easy control and simplicity and ability to move around the silo For this reason a mechanical and hydraulic power train were designed and installed on a solid frame chassis which hold the cutting drum via two hydraulic jacks Mean maximum and specific power requirements and energy consumption and material capacity were determined using the cutter downward speed and cutting depth as independentvariables A factorial analysis with a completely randomized design with three replications was used Cutter down ward speedwas chosenwith three levels of 0 9 1 4 and 2 5 cm s and was varied using a flow control value to send different flows to hydraulic jacks Also cutting depth chosen was on three levels of 20 30 and 40 cm Average moisture content and mean bulk density of the material cut were measured to be 76 percent on a wet basis and 879 kg m 3 respectively Results indicated that cutter speed and cutting depth interaction effects for all experiments were statistically significant Maximum power requirement and energy consumption components were observed at 25 cm s cutter speed and 40 cm cutting depth Als6 least power requirement and energy consumption components were observed at cutting depth of 20 cm and speed of 0 9 cm s Mean power requirement and energy consumption at the speed of 0 9 cm s followed a linear pattern and at the speedsof 2 5 and 1 4 cm s changedbased on a second degree function in respect to the cutting depth Specific power and energy for all cutter speeds varied based on second degree function with cutting depth Machine material capacity increasedlinearly as cutting speedand depthincreased OJ d 1 tJ lifJ 1r 1I J IIJt 1

جليل رضوي، عباس همت

محمدرضا فروزان، امين اله معصومي

جهانگير عابدي، حسن خادمي زاده