scholarly journals Machine learning based nominal root stress calculation model for gears with a progressive curved path of contact

2021 ◽  
Vol 165 ◽  
pp. 104430
Author(s):  
Uroš Urbas ◽  
Damijan Zorko ◽  
Nikola Vukašinović
2019 ◽  
Vol 15 (2) ◽  
pp. 523-536
Author(s):  
Jinliang Liu ◽  
Yanmin Jia ◽  
Guanhua Zhang ◽  
Jiawei Wang

Purpose The calculation of the crack width is necessary for the design of prestressed concrete (PC) members. The purpose of this paper is to develop a numerical model based on the bond-slip theory to calculate the crack width in PC beams. Design/methodology/approach Stress calculation method for common reinforcement after beam crack has occurred depends on the difference in the bonding performance between prestressed reinforcement and common reinforcement. A numerical calculation model for determining the crack width in PC beams is developed based on the bond-slip theory, and verified using experimental data. The calculation values obtained by the proposed numerical model and code formulas are compared, and the applicability of the numerical model is evaluated. Findings The theoretical analysis and experimental results verified that the crack width of PC members calculated based on the bond-slip theory in this study is reasonable. Furthermore, the stress calculation method for the common reinforcement is verified. Compared with the model calculation results obtained in this study, the results obtained from code formulas are more conservative. Originality/value The numerical calculation model for crack width proposed in this study can be used by engineers as a reference for calculating the crack width in PC beams to ensure the durability of the PC member.


1985 ◽  
Vol 107 (3) ◽  
pp. 412-417
Author(s):  
Tae Hyong Chong ◽  
Aizoh Kubo

A method to apply the approximation formulae [1] for tooth fillet and root stresses of a thin-rimmed spur gear to the calculation of stress state of an internal spur gear is introduced, for the case of an internal spur gear which is fixed by bolts and/or supported by pinned coupling similar to geared coupling. By this method, reliable stress state at tooth fillet and root areas in the whole internal gear can be easily calculated.


2019 ◽  
Vol 26 (4) ◽  
pp. 1055-1065
Author(s):  
Min Jin ◽  
Md Rasedul Islam ◽  
Liu Li ◽  
Mohammad Habibur Rahman

1999 ◽  
Vol 36 (4) ◽  
pp. 493-508 ◽  
Author(s):  
R. Corthésy ◽  
Guang He ◽  
D.E. Gill ◽  
M.H. Leite

2011 ◽  
Vol 488-489 ◽  
pp. 85-88
Author(s):  
Gordana Marunić ◽  
Goran Gregov ◽  
Vladimir Glažar

The paper deals with the discussion how nominal spur tooth root stress of thin-rimmed gear determined in accordance with the standard ISO 6336-3:2006, method B, agrees with the results of the 3D FEM stress analysis. The procedure proposed by standard ISO for the tooth root stress calculation doesn’t identify the stress behaviour related to mutual affects of characteristic thin-rimmed gear geometrical parameters. Therefore, the 3D FEM analysis of tooth root stress has been performed for gear structures with middle and offset web with various rim and web thickness. The rim thickness has covered and slightly overcome the backup ratio defined by ISO procedure, while the web thickness has covered the range of practical interest.


2013 ◽  
Vol 275-277 ◽  
pp. 332-335
Author(s):  
Wan Chun Zhao ◽  
Ting Ting Wang ◽  
Jing Bo Zhang ◽  
Wei Wei Yuan

To precisely describe the fracture opening and extending during the process of refracturing, in this paper the actual mechanical characteristics of the reservoir before the refracturing has been considered, according to the principle of conservation of energy, the calculation model of the damage stress of the rock around the borehole before the refracturing has been established, and at the same time the calculation model of the fracture veer has been established , then the well A in Jilin Oilfield has been chosen to calculate and analyze, the calculation results demonstrate that the corrigendum between the actual results and the calculation results is 0.2%, which are very anastomosing.


2014 ◽  
Vol 996 ◽  
pp. 355-360
Author(s):  
Kai Liao ◽  
Li Jun Li ◽  
Yun Xin Wu ◽  
Hai Gong

Layer removal method is an experiment method which is used to calculate the average stress indirectly by deformation of the specimen. However, in the experiment, some certain predeformation can be caused after each clamping, which can affect the accuracy of the test data, and make the deformation data larger. Based on the comparison of the simulation calculation, this paper builds an amended function by fitting the deformation error, which solves the deviation caused by larger deformation on stress calculation while the specimen is milled by layer, that is to say, the stress calculation model can be compensated by this function. This method can make the experimental calculation model more accurate.


2020 ◽  
Vol 7 (3) ◽  
pp. 541-560
Author(s):  
Li YANG ◽  
Junlin YI ◽  
Hui PENG

AbstractAs the growing number of cases is draining the limited court resources in China, how to scientifically measure the reasonable saturated workload of judges has become an urgent issue. This issue is the prerequisite of other important topics such as determination of judges’ quotas, measurement of the actual workload of a trial team, performance evaluation of judges, and resource allocation within courts. Data-driven measurement of the actual workload of China’s judges depends on various factors such as local economic development, public transportation, case-load in the past, and staffing of assistant positions. Therefore, traditional approaches that depend only on a single element, such as cause of action, do not work well. We proposed a modelling framework based on big-data and machine-learning technology to more accurately measure the actual workload of judges. This framework extracts the core elements of judicial cases, assigns target workload to the cases based on feedback from judges and analyzing case samples to create a standard training dataset, and trains machine-learning models using the data. A preliminary case-weight calculation model is built using the framework. Besides, the model is continuously evaluated and improved by comparing its output with the actual demand in a court through methods such as sampling, questionnaires, and expert evaluation.


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