5 results on '"index error"'
Search Results
2. Gear transmission dynamics: Effects of index and run out errors.
- Author
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Fernández-del-Rincón, A., Iglesias, M., de-Juan, A., Diez-Ibarbia, A., García, P., and Viadero, F.
- Subjects
- *
AUTOMOBILE transmission , *GEARING machinery , *VIBRATION (Mechanics) , *MECHANICAL loads , *NUMERICAL calculations - Abstract
This work describes a non-linear dynamic model for the study of the vibration signals generated by gear transmissions. The developed model considers both the parametric excitations due to the variable compliance of bearings and gears, can handle changes in the transmitted torque and allows the integration of the dynamic equations quickly and accurately. This model has been developed previously by the authors to assess the profile deviations on the dynamic behavior of gear transmissions and its influence on the transmitted torque. It also includes the presence of gear defects as cracks and pitting during the calculation of meshing forces. In this paper, the model has been enhanced in order to include two common defects such as index errors and run out or eccentricity errors. Index errors occur as a result of a non-uniform angular distribution of the tooth profiles along the pitch circle. Run out appears due to the displacement of the geometric center of the gear with respect to the center of rotation of the shaft on which it is mounted. Although both errors are caused by different reasons, sometimes they have been confused because of their similitudes. The procedure for including both kinds of errors in the model is described and simulations under several transmitted torques are presented. The results are assessed and compared focusing the attention on certain transmission parameters and magnitudes as transmission error, load forces in the tooth flanks and demodulation techniques on the resulting vibratory signals. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
3. index error
- Author
-
Herrmann, Helmut and Bucksch, Herbert
- Published
- 2014
- Full Text
- View/download PDF
4. О методике использования характеристики «Оптимальная плотность» в исследованиях по обработке почвы
- Subjects
погрешность показателей ,оптимальная плотность почвы ,основная обработка почвы ,appropriate bulk density ,main tillage ,crop growing season ,methods of soil consistency determination ,index error ,методы определения плотности сложения почвы ,вегетация культуры - Abstract
Одним из основополагающих критериев при оптимизации технологии обработки почвы является соответствие плотности обработанного слоя величине «оптимальной плотности». При этом в качестве величины «оптимальной плотности» повсеместно используется плотность почвы, определенная до начала посева, распространяя ее действие на весь период вегетации. Данная мера до последнего времени являлась вынужденной из-за отсутствия исследований по данному вопросу. Величина «оптимальной плотности», определенная непосредственно в период вегетации показывает, что плотность почвы оказывает достоверное влияние на урожайность только в фазу развития растений «кущение – выход в трубку» и в слоях глубже уровня заделки семян при посеве. В остальные периоды вегетации и в верхнем слое почвы влияние плотности на урожайность математически не достоверно. В этот период на одинаковую плотность почвы, создаваемую различным набором почвообрабатывающих орудий, яровые ячмень и пшеница отзываются одинаковой урожайностью. То есть, продуктивность растений зависит не от конкретного орудия, использованного для обработки почвы, а от возможности поддержания оптимального сложения почвы минимум до фазы развития растений «кущение – выход в трубку», разновидности почвы и выращиваемой культуры. Поэтому действующая методика определения допустимости применения конкретной обработки, основанная на величине «оптимальной плотности» почвы определенной для момента готовности почвы к посеву, и равная 1,1-1,3 г/см3, дает значительные погрешности и должна быть исключена из применения. Для темно-серой лесной тяжелосуглинистой почвы в фазу «кущение – выход в трубку» величина «оптимальной плотности» (без учета режима увлажнения текущего года) равна: в слое 0-10 см – 1,168 г/см3, в слое 10-20 см – 1,325 г/см3, в слое 20-30 см – 1,365 г/см3., One of the fundamental criteria by optimization of soil treatment technologies is corresponding to the processed layer of soil to “bulk density”. In this case, as a quantity of bulk density is universally used the density of soil, which was determined before sowing and was considered to be the same during the vegetation. This measure was necessary because of the lack of researches in this area so far. The index of “bulk density”, determined during vegetation showed that density of soil has a significant effect on yield only in a stage of plant development “tillering – stem elongation” in layers of soil that are deeper than the depth of seed placement. At other times of vegetation and in the top layer of soil the impact of soil density on yield is mathematically is not confirmed. At that period summer barley and wheat have the same yield based on the same density of soil and various cultivation tools. It means that productivity of crops doesn’t depend on the concrete tool, which was used for cultivation, but on the appropriate soil consistency up to a stage of plant development “tillering – stem elongation”, soil variant and crop. That is why the current method of determining whether this cultivation method is available, which is based on the index of “bulk density” defined for sowing and is 1,1 – 1,3 g/cm3, is in error and should be excluded. For a dark gray heavy loam forest soil during “tillering – stem elongation” the index of “bulk density” (regardless of moisturizing level of the current year) is: on the depth of 0-10 cm – 1,168 g/cm3, on the depth of 10-20 cm – 1,325 g/cm3, on the depth of 20-30 cm – 1,365 g/cm3.
- Published
- 2019
- Full Text
- View/download PDF
5. An Experimental Study of the Dynamic Response of Spur Gears Having Tooth Index Errors
- Author
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Sun, Allen Y.
- Subjects
- Mechanical Engineering, gear design, dynamic factor, index error, gear manufacturing, experimental database, root stress
- Abstract
While there are numerous theoretical and experimental investigations of dynamic behavior of gear pairs of higher quality grades, very little is known about the same when certain classes of manufacturing errors are present. This study aims at investigating the effects of tooth index errors, one of the most common types of manufacturing errors. Using the changes in stresses along the tooth root regions as the metric, an experimental study is executed here to (i) establish a baseline dynamic behavior under no tangible index error and (ii) characterize the changes caused by tightly-controlled intentional index errors to this baseline dynamic behavior. For this, various gears having different forms of index errors are paired with an instrumented gear having no such errors. For each gear pair, tests are performed within wide ranges of torque and speed. A data processing scheme is proposed to normalize the measured stress signals to multiplication factor. It is shown that the baseline dynamic response represented solely by the dynamic stress factor is altered significantly by transient vibrations induced by the indexing errors, in some cases fully altering the baseline dynamic behavior and increasing the stress multiplication factors significantly. The experimental database formed in this study is expected to guide much needed theoretical studies on this topic.
- Published
- 2015
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