Poljoprivredna tehnika最新文献

{"title":"Ride analysis of self-propelled agricultural machine: Hidromatiks S-PST","authors":"B. Stojić","doi":"10.5937/POLJTEH1901019S","DOIUrl":"https://doi.org/10.5937/POLJTEH1901019S","url":null,"abstract":"","PeriodicalId":281326,"journal":{"name":"Poljoprivredna tehnika","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134123901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of moisture content on physioco-mechanical properties of cashew-apple-nut varieties relevant for its processing","authors":"Ejikeme Patrick, E. Chukwuka, N. Chikaodili","doi":"10.5937/poljteh2202072e","DOIUrl":"https://doi.org/10.5937/poljteh2202072e","url":null,"abstract":"The physioco-mechanical properties of Red and Yellow apple cashew nuts which are essential for the design and fabrications of its processing and storage facilities were studied. The major, minor and intermediate diameter of the cashew nut varied from 21.81-30.43mm, 14.01-17.18mm, 4.72-10.55mm and 19.83-27.13mm, 16.09-20.27mm, 6.38-13.97mm for Red and Yellow apple respectively. The average values of bulk weight, surface area and volume of the samples were 20.58189.5g, 826.07-342.33g, 137.67-57.05 (mm3) and 229.8-211.8g, 699.97-305.40mm2, 173.13-70.63mm3. The average values of sphericity, porosity and aspect ratio of the samples were 56.23-50.47%, 73.39-28.83%, 56.19 - 64.05% and 70.08-62.09%, 66.82-24.71%,74.60-81.00%. It was observed that all the physical properties studied increased with an increase in moisture apart from bulk density and aspect ratio that decreased across the moisture content. The mechanical properties of Red and Yellow apple cashew nut were found to be moisture content and loading positions dependent. The relationship that existed between moisture content and the mechanical properties was statically significant at (p< 0.05) level. It is also economical to load both Red and Yellow apple cashew nut at major axis loading position at 4.26% (wb) moisture content to reduce energy demand required to crack or compress the samples.","PeriodicalId":281326,"journal":{"name":"Poljoprivredna tehnika","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125025628","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A study of Aerodynamic properties of Yam flour","authors":"Chineze Okeke, S. Oluka","doi":"10.5937/poljteh2102011g","DOIUrl":"https://doi.org/10.5937/poljteh2102011g","url":null,"abstract":"The aerodynamic properties of five varieties of Yam namely: white yam, purple yam, three leaves yam, water yam and yellow yam were investigated under oven drying methods at 33oC. The dried yams were milled to flour and were taken to laboratory to determine their aerodynamic properties with respect to pneumatic conveying of the yam flours. The yam flour varieties recorded terminal velocity range of 1.38 to 1.60 m/s. Drag coefficient of 0.47 and Reynolds number varying from 0.63 to 0.97x10-5 kgm-2 /s. The analysis of variance conducted on the effect of yam varieties on the aerodynamic properties of yam flour did not show significant difference at both 5% and 1% level of probability. The study will guide engineers in design of yam flour pneumatic conveying equipment.","PeriodicalId":281326,"journal":{"name":"Poljoprivredna tehnika","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114588008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research of the influence of spare parts quality on the work of a repair diesel engine","authors":"V. Krstić, Božidar Krstić","doi":"10.5937/poljteh2102038k","DOIUrl":"https://doi.org/10.5937/poljteh2102038k","url":null,"abstract":"When repairing the internal combustion Diesel engine, a set of spare parts was installed: crankshaft-flywheel. After the overhauol, the engine was tested on a test bench. After a very short time of operation, an engine failure occurred. Re-overhaul was started, with another set of spare parts: crankshaft-flywheel. After a short time of operation, there were recurrences of engine failures, according to the same mechanisms of occurrence.","PeriodicalId":281326,"journal":{"name":"Poljoprivredna tehnika","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128278621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Determination of main parameters of ISOBUS system based agricultural machinery management","authors":"Magó László, K. Gligorević, M. Drazic, M. Oljača","doi":"10.5937/poljteh2103040m","DOIUrl":"https://doi.org/10.5937/poljteh2103040m","url":null,"abstract":"ISO organization (https://www.iso.org) in early 90s defined an industry standard for the communication protocol among electronic devices of different manufacturers of agricultural machines. After that, all of the market actors recognised that this technology would be very important for agricultural electronics. The appearance of ISOBUS products in the market was in the mid-2000s. ISOBUS description could be found in ISO-11783 (https://www.iso.org). Through the standards and the related technical background, the production processes and the operations could be followed and monitored by the extensive Data Management. Farmers' and users legitimate needs and developing goal is to elaborate a decision support systems that follow-up the utilisation of the machines and ensure the quality of operations. For this purpose, it is essential to determine which technical, economical, technological parameters detection, measurement, transmission, processing, and evaluation becomes necessary. In our work, we reviewed which mechanical characteristic, settings are monitored within the ISOBUS system by the major machine manufacturers. We developed the system of parameters and derived features that provide effective farm-, and land-management in case of attached equipment for spreading of input materials, plant protection and tillage implements.","PeriodicalId":281326,"journal":{"name":"Poljoprivredna tehnika","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127900682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Direct methods for determination of the egg shell strength","authors":"R. Koprivica, B. Veljković, S. Rakonjac, M. Božić, V. Vujičić, D. Radivojević, D. Marković, G. Topisirović","doi":"10.5937/poljteh2102001k","DOIUrl":"https://doi.org/10.5937/poljteh2102001k","url":null,"abstract":"During the manipulation of hen eggs from the farm to the consumer due to action of external forces and weak mechanical strength of shell, the eggs break. The goal of egg producers is to reduce losses when breaking eggs during the production and placement, and thus increase revenues. Each egg can be damaged by external forces whose values are greater than maximum strength of the egg shell. Direct and indirect methods are used to determine the quality of eggs and shell strength. By direct methods, strength of the shell can be determined on the basis of puncture force measurements, impact forces, quasi-static compression forces and free fall forces on a known surface. In our research, a device was constructed for the realization of experiment and a direct method for determining strength of eggs was applied on the basis of measured breaking force of the shell. The device for measuring strength of eggs by the direct method of puncture eggshell was constructed and applied at the Faculty of Technical Sciences and the Faculty of Agronomy in Čačak. Class \"M\" hen eggs produced on the \"Grbović\" farm in the vicinity of Čačak were used in the research. The laying hens are a 41-week-old Isa Brown hybrid. During the research, physical characteristics of hen eggs were determined: length, width, index of shape and weight of eggs, as well as weight of the shell, share of the shell in the total mass of eggs, thickness and puncture force of the shell. The results of research show that the length of egg is 57.00 mm, width 44.59 mm with a coefficient of variation from 2.7 to 1.4%. The thickness of egg shell is on average 0.39 mm, in range from 0.377 to 0.416 mm. The share of shell is 10.54% of average weight of eggs (62.43 g). The quality of the tested eggs was quite uniform because the puncture force of egg shell ranged from 20.35 to 23.97 N. The research results are important for cage construction, design of egg collection equipment, design of egg packaging, and applicable in selection for obtaining new genotypes of laying hens with increased resistance to egg breaking.","PeriodicalId":281326,"journal":{"name":"Poljoprivredna tehnika","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130120972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Equipment and engagement of mechanization on the family agricultural farm","authors":"R. Koprivica, B. Veljković, M. Gavrilović, Aleksandar Šiljić, V. Rašković, N. Stošić, D. Terzić, D. Đokić","doi":"10.5937/poljteh2104074k","DOIUrl":"https://doi.org/10.5937/poljteh2104074k","url":null,"abstract":"The equipment and engagement of tractor and attached machines were examined on the example of the average family farm Šiljić in Serbia. The research was performed on a registered agricultural farm in the village of Selevac, municipality of Smederevska Palanka. The family farm Šiljić has a total of 5,4 ha of used agricultural land. In production season 2019/2020 wheat was sown on 2 ha and 1 ha of maize, sunflower and triticale each. On the area of 0,4 ha is a backyard and garden. The farm owns a tractor IMT-558, a plough, a disc harrow, a harrow, a sprayer and a trailer, purchased in 1979. The old machinery is in use. The registered family farm Šiljić is insufficiently equipped with mechanization. With a two-axle tractor with a power of 42.65 kW and 5 attached machines cultivates 5.4 ha, so the energy equipment is 8.5 kW/ha. The tractor is mostly engaged in the production of corn 10,0 h/ha, sunflower 9,5 h/ha, triticale 8,33 h/ha and the least is wheat 7,41 h/ha of effective work. On the farm Šiljić, on the area of 5 ha, out of a total of 42,66 hours of work, the tractor was mostly used in the basic tillage 17,0 h or 3,1 h/ha. The tractor is also engaged in pre-sowing soil preparation with a disc harrow 9 h (1,8 h/ha) and a harrow 7 hours (1,4 h/ha), in a transport 5,33 h (1,07 h/ha), in the application of pesticides with a sprayer 4,33 h (0,87 h/ha). In addition to the total effective work in the implementation of certain agro-technical measures in the production of field crops, the tractor was hired at 7,30 hours to leave and return from the plot (auxiliary working hours). Fuel consumption in basic tillage was 18 l/ha, in presowing preparation with a disc harrow 10 l/ha, harrow 5 l/ha and 5 l/ha in the application of pesticides and transport of products.","PeriodicalId":281326,"journal":{"name":"Poljoprivredna tehnika","volume":"67 35","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131638369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparative exploration of mechanized systems for palm broom production","authors":"Raphael Ozioko, O. Egwuagu, B. Nwankwojike","doi":"10.5937/poljteh2203079o","DOIUrl":"https://doi.org/10.5937/poljteh2203079o","url":null,"abstract":"Performance and economic capabilities of two distinct mechanized systems for processing brooms from coconut and oil palm leaflets were surveyed in this study to determine the best technology to advance/adopt for commercialization. The systems are abrasive roller and knife edge aided peeling based machines while peeling efficiency, processing time/throughput, payback period and benefit cost ratio constitute the parameters weighed. Results revealed the knife edge based peeling systems as most viable even though the abrasion process based system performs with high throughput. This because it's peeling efficiency of 96% is above the minimum acceptable rate of 95% and that of the abrasion process system (94%) is less. This, implies 5% scraps/reworks associated with abrasive aided peeling system which amount to post peeling operation of sorting. The high cost of production induced by this post peeling operation is obvious from the high payback period and low benefit cost ratio of this system compared the knife edged aided process. The payback and benefit cost rating of knife edge aided system amounts to 0.8 and 2.45 respectively while 1.69 and 1.76 constitutes the respective ratings of abrasion process based machines. In addition, the knife edge aided processing system peels both fresh and dry palm leaflets while the abrasion peeling system handles dry leaflets only. Hence, adoption of knife edge aided peeling process is recommended for advancing broom production from palm leaflets.","PeriodicalId":281326,"journal":{"name":"Poljoprivredna tehnika","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127521002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design and development of a multi-tasks motorized ginger rhizomes juice expression machine","authors":"K. Simonyan, O. Onu, C. Kadurumba, O. Okafor-Yadi, T. Paul","doi":"10.5937/poljteh2203056s","DOIUrl":"https://doi.org/10.5937/poljteh2203056s","url":null,"abstract":"Manual ginger juice expression processes are tedious, unhygienic, and inefficient, affecting the quality and quantity of ginger juice extracted. Extraction by chemical means is complex, expensive, and requires high skill to operate. The developed motorized ginger juice expression machine performs two distinct unit operations: size reduction and separation processes. Major components of the machine include the feeding unit, pulverizing unit, juice expression unit, juice drainage point, waste outlet, frame, and power transmission system. The machine is powered by 2 H.P., 1400 rpm and 1 H.P., 1430 rpm prime movers, and the V-belts and pulley assembly speed are 646 rpm and 240 rpm, respectively. The developed expression machine offers an affordable and simple method of processing fresh ginger minimizing loss in ginger rhizome quantity and quality, and ultimately reducing postharvest losses.","PeriodicalId":281326,"journal":{"name":"Poljoprivredna tehnika","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133807450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Performance evaluation of a motorized ginger rhizomes peeling machine","authors":"Arocha Godswill, Simonyan Joshua, T. Paul","doi":"10.5937/poljteh2104084g","DOIUrl":"https://doi.org/10.5937/poljteh2104084g","url":null,"abstract":"A 5kg motorized Ginger rhizome (Zingiber Officinale Roscoe) peeling machine was designed, developed and tested. Three moisture contents (70%, 75% and 80% wb), three feed rates (54 kg/h, 68 kg/h and 73 kg/h) and three peeling speeds (230 rpm, 270 rpm and 300 rpm) were used for the performance evaluation of the machine. A 3 × 3 × 3 factorial experiment in a randomized complete block design (RCBD); replicated two times was used to study the effects and interactions of the three factors (moisture content, feed rates and peeling speed) on the performance parameters (peeling efficiency, peeling capacity and percent damage). Relationship between performance parameters and the influencing factors were determined using multilevel factorial design and response surface methodology for the graphical analyses. The study showed that peeling efficiency increased from 82.3% to 88.5% with an increase in moisture content from 70% to 80%, a decrease in feed rate from 73 kg/h to 54 kg/h and an increase in peeling speed from 230 rpm to 300 rpm. Peeling capacity increased from 2.4 kg/h to 11.64 kg/h with an increase in moisture content from 70% to 80%, a decrease in feed rate from 73 kg/h to 54 kg/h and an increase in peeling speed from 230 rpmto300 rpm. Percent damage increased from 6.3% to 14.4% with a decrease in moisture content from 80% to 70%, an increase in feed rate from 54 kg/h to 73 kg/h and an increase in peeling speed from 230 rpm to 300 rpm. The analysis of variance (ANOVA) result showed that the interaction of moisture content, feed rate and peeling speed had significant effect on peeling efficiency, peeling capacity and percent damage at p<0.05 level. For a maximum peeling efficiency, peeling capacity and minimum percent damage, an optimum moisture content of 75%, feed rate of 68 kg/h and peeling speed of 270 rpm were recommended for use.","PeriodicalId":281326,"journal":{"name":"Poljoprivredna tehnika","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114754779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}