INMATEH - Agricultural Engineering

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Authors: Popa Gh., Buculei M.

In this paper are presented and analyzed the experimental test results for tractor U 650-braking system, in INMA Bucharest laboratory. We determined the torque for the drive wheels of the tractor (Mr), the hydrostatic motor shaft torque (MMh)tangential traction forces (Fm) and braking carriage thrust (Ft).

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Authors: Dinu I, Popa C., David M.F.

In this paper is presented the press room of the MAC – 3 machine endowed with two pressing mechanisms, while also showing the advantages of the new system. Also the diagram of the two pressing mechanisms is given, while equations are established for determining the speed distribution by using the independent cycle method.

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Authors: Vieru I., Petrache Gh., Nicolae V., Pârlac S., Neagu E.

This paper presents a first study on dynamic analysis done on a rear axle with torsion beam. The main purpose of this analysis is to establish the natural vibration modes with similar values which are likely to come into resonance. The CAD models of the parts were obtained using CATIA V5 application and the calculation was performed with FEM using MSC/NASTRAN software. The experimental determinations were performed in the vibration laboratory of the University of Pitesti.

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Authors: Liu M., Wang H.

Agriculture survey and evaluation UAV is kind of advanced high-efficiency agriculture information equipment that can be used to farmland measurement, agricultural insurance assessments and other fields. BeiDou Navigation Satellite System is China’s global navigation satellite system which has been developed independently ， and currently it is rarely applied in agriculture survey and evaluation UAV. Since BeiDou navigation system can only provide location information, an integrated navigation system that composed by BeiDou Navigation Satellite System, Strapdown Inertial Navigation System and Air Data System is proposed to improve the navigation accuracy of UAV navigation system. Integrated navigation system model is established, and to improve the navigation system parameters solving speed, and also to overcome the filtering divergence phenomenon caused by the system model uncertainty, a modified two-step adaptive Kalman filter algorithm for navigation parameters solving is proposed. Simulation results show that the proposed integrated navigation system and parameters solving algorithm can effectively improve the UAV navigation accuracy and prevent divergence of the filter.

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Authors: Manea I., Gîrnita I., Matache M., Muscalu A., Persu C., Voicea I.

The paper presents theoretical and experimental researches on the use of experimental modal analysis as an instrument of appreciation of fatigue state, as well as to identify the structural changes of the complex mechanical structures. The application is carried out on a railway bogie frame, performed at SC Softronic Craiova, being in course to be tested for static and fatigue stress at INMA Bucharest. Researches are in full progress, in the article being presented the results of initial tests as well as those performed after 6 millions of stress cycles at fatigue.

10

Authors: Xu L., You Z., Wu S., Zhao H., Wu L.

There is little equipment specially developed for grading kiwi fruit in both China and foreign countries. While the full automatic grading equipment often has complex mechanical structure and costs highly, it always grades kiwi fruit on the basis of singular feature such as size, weight, shape, color and surface defect such that it is hard for them to promote kiwi fruit’s market competitiveness. Therefore, this paper developed a set of practical automatic kiwi fruit grading equipment basing on technologies of mechanical separation and conveyance, image capture and processing as well as intelligent control. This set of equipment mainly consists of material storage bin, single-line positioning system, image capture system and grading executive system. And it also has programs of image capture, image processing, grade determination and human-machine interaction for the host computer as well as control programs for the slave computer. Its operating principle is that: firstly put a small amount of kiwi fruits or slowly put kiwi fruits into the storage bin and switch on, and then the host computer sends the startup command to the slave computer. Upon receiving such command, the slave computer starts grading equipment and initializes the camera. The camera will then get into the image capture state. Kiwi fruits are conveyed to the image capture system by the single-line positioning system in single row. Upon the slave computer receives the signal that kiwi-fruits are on position sent by the position sensor of the image capture system, it will immediately send such signal to the host computer. Then the host computer will store the images from the camera at this time and discard the images captured at other time. After the host computer carries out relevant operations such as image processing and grade determination to moving images, it will send grading results to the slave computer. At this time, the kiwi fruits will have been conveyed to the grading implementation area and the slave computer will control the implementation system at all levels to perform grading. Each kiwi fruit will be graded through the same grading flow. By testing, this equipment is capable of grading by three features of size, shape and surface defect and their grading accuracy can reach to 88.9%, 91% and 94% respectively. And the accuracy of integrated grading can reach to 86%. The output of this equipment can reach to 1.22kg/min which is much more than the efficiency of manual grading. With simple mechanical structure and low cost, this equipment reduces the processing cost of kiwi fruit and is suitable to vast middle and small users.