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| 大友, 功一; 岸本, 正; OHTOMO, Koichi; KISHIMOTO, Tadashi. |
| トラクタのけん引性能を評価するための一つの方法として, 2輪駆動トラクタのけん引効率の予測を行なった。予測精度を検討するために, トラクタの機体条件ならびに平均円すい指数からけん引効率等を予測すると共に, 土壌密度を変えた圃場でけん引性能試験を行ない実測データを収集した。けん引力およびけん引効率の実測値の予測値に対する偏差と予測最大値との比を偏差率として定義し求め, 予測精度を検討した。その結果, 全データの偏差率の平均値は, けん引力で0.07%, けん引効率で-0.29%となり, 提案モデルは高い精度で予測できることを示した。 A prediction of the tractive efficiency of a two-wheel drive tractor was conducted with tractor dimensions and average cone indexes. Experimental data in a field for the discussion of the prediction accuracy were obtained through tractor drawbar pull tests. The deviations of the measured data to the predicted one of drawbar pull and tractive efficiency were calculated，and the deviation rates which were defined as the ratio of the deviation to the predicted maximums of the drawbar pull and the... |
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Palavras-chave: トラクタ; けん引力; けん引効率; 円すい指数; 予測モデル; Tractor; Drawbar pull; Tractive effciency; Cone index; Prediction model. |
| Ano: 2000 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2955 |
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| Bianchini,Aloísio; Roque,Márcio W.; Rosa,Rodrigo P.. |
| The aim of this study was to develop a an automated bench top electronic penetrometer (ABEP) that allows performing tests with high rate of data acquisition (up to 19,600 Hz) and with variation of the displacement velocity and of the base area of cone penetration. The mechanical components of the ABEP are: a supporting structure, stepper motor, velocity reducer, double nut ball screw and six penetration probes. The electronic components of ABEP are: a "driver" to control rotation and displacement, power supply, three load cells, two software programs for running and storing data, and a data acquisition module. This penetrometer presented in compact size, portable and in 32 validation tests it proved easy to operate, and showed high resolution, high... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil compaction; Soil resistance to penetration; Velocity test; Cone index. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000600012 |
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| Khodaei, Mehdi. |
| Compaction is one of the restricting factors in desirable seed germination and root growth. As a sign for soil compaction can be a criterion for optimal seed germination. Seeds require some compression of the surrounding soil at planting for optimum growth, which it is made by pressure wheels in planters. Travel speed and working depth affect the soil cone index. A field experiments were conducted to evaluate the effects of the speed and working depth in the beginning of the autumn season. Experiments were performed in the form of factorial split-plot based on a randomized complete block design with two factors, the travel speed (3, 4, and 6 km/h) and working depth (3, 6, 9, 12 and 15 cm) in three replication. Digital cone Penetrometer was used for... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Compaction; Cone index; Corn planter; Depth; Moving speed; Pressure wheel. |
| Ano: 2015 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3364 |
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| Bortoluzzi,Edson Campanhola; Parize,Guilherme Luis; Korchagin,Jackson; Silva,Vanderlei Rodrigues da; Rheinheimer,Danilo dos Santos; Kaminski,João. |
| Analyzing the soil near crop roots may reveal limitations to growth and yield even in a no-tillage system. The purpose of the present study was to relate the chemical and physical properties of soil under a no-tillage system to soybean root growth and plant yield after five years of use of different types of limestone and forms of application. A clayey Oxisol received application of dolomitic and calcitic limestones and their 1:1 combination in two forms: surface application, maintained on the soil surface; and incorporated, applied on the surface and incorporated mechanically. Soil physical properties (resistance to mechanical penetration, soil bulk density and soil aggregation), soil chemical properties (pH, exchangeable cations, H+Al, and cation... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dolomitic limestone; Calcitic limestone; Soil physical resilience; Cone index. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000100026 |
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| Bonnin,Juan José; Mirás-Avalos,José Manuel; Lanças,Kléber Pereira; González,Antonio Paz; Vieira,Sidney Rosa. |
| The aim of this work was to analyze the spatial distribution of soil compaction and the influence of soil water content on the resistance to penetration. The latter variable was described by the cone index. The soil at the study site was a Nitisol and the cone index data were obtained using a penetrometer. Soil resistance was assessed at 5 different depths, i.e. 0-10 cm, 10-20 cm, 20-30 cm, 30-40 cm and deeper than 40 cm, whereas soil water content was measured at 0-20 cm and 20-40 cm. Soil water conditions varied during the different samplings. Coefficients of variation for cone index ranged from 16.5% to 45.8% while those for soil water content varied from 8.96% to 21.38%. Results suggested a high correlation between soil resistance, as assessed by the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cone index; Indicator kriging; Soil compaction; Spatial distribution. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052010000500017 |
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