scholarly journals Strength Analysis of a PTO (Power Take-Off) Gear-Train of a Multi-Purpose Cultivator during a Rotary Ditching Operation

Energies ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 1100 ◽  
Author(s):  
Yeon-Soo Kim ◽  
Pa-Ul Lee ◽  
Wan-Soo Kim ◽  
Oh-Won Kwon ◽  
Chang-Won Kim ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Service Life ◽  
Safety Factor ◽  
Gear Train ◽  
Measuring System ◽  
Soil Conditions ◽  
Strength Analysis ◽  
Actual Measurement ◽  
Simulation Results ◽  
Fatigue Life Analysis

Optimal design of transmission gears is important to ensure product durability and reliability. This study measured a multi-purpose cultivator during a rotary ditching operation and analyzed the strength of the power take off (PTO) gear-train for the cultivator using analysis software (KISSsoft, KISSsoft AG—A Gleason Company, Bubikon, Switzerland) based on ISO 6336 standards and a modified Miner’s rule. A load measurement system was installed on the cultivator to measure the load on the PTO shaft. To measure the load on the PTO shaft, the load measuring system consisting of a data acquisition board (NI USB-6212, National Instruments, Austin, TX, USA) and a torque sensor was installed on the cultivator. Rotary ditching operations were conducted at two ground speeds and two PTO rotational speeds on a field with the same soil conditions. The measured load data were constructed using the rainflow-counting algorithm and the Smith-Watson-Topper equation. When the ground speed or PTO rotational speed increased, the average and maximum PTO torque increased significantly. The average measured torque ratio to rated torque of the PTO input shaft (19.6 Nm) was in the range of 50.1–105.9%. The simulation results using the actual measurement load indicated that the strength of the PTO gear-train tended to decrease with higher transmission gear stage and lower PTO gear stage except for the G2 and G3 gears. The simulation results of the safety factor for contact stress were lower than the minimum safety factor of ‘1.0’ at the T2P1 gear stage (G4 and G2). The simulation results of the fatigue life analysis showed fatigue life of less than service life (1000 h) at T2P2 (G2) and T2P1 (G2, G3, and G4). The simulation results indicate that there is a possibility of gear failure before service life at the T2P1 (G2, G3, and G4) and T2P2 (G2). It is known that the weak parts (G2, G3, and G4) should be the focus of design optimization through gear strength simulation to meet upward of a 1.0 safety factor and service life.

scholarly journals Fatigue Analysis of Mobile Maintenance Platform Based on Ansys Workbench

2018 ◽  
Vol 175 ◽  
pp. 03048
Author(s):  
Yongliang Yuan
Keyword(s):  
Fatigue Life ◽  
Optimization Design ◽  
Strength Analysis ◽  
Stress And Strain ◽  
Large Space ◽  
Damage Theory ◽  
Simulation Results ◽  
Cumulative Fatigue Damage ◽  
Deformation Stress ◽  
Ansys Workbench

In order to investigate the performance of the mobile maintenance platform, Ansys Workbench was used to analyze the strength analysis of the mobile maintenance platform. The deformation, stress, and strain were obtained. The fatigue module was used to analyze the fatigue of the mobile maintenance platform and the fatigue life based on the cumulative fatigue damage theory. The simulation results show that the strength of the mobile maintenance platform is sufficient, and its lifetime is as high as 19.8 years. The mobile maintenance platform has a large space for optimization and this paper provides a basis for future structural optimization design.

Effect of Joint Behavior on the Reassessment of Fixed Offshore Platforms in the Bay of Campeche, Mexico

2005 ◽  
Author(s):  
Partha Chakrabarti ◽  
Adinarayana Mukkamala ◽  
Ibrahim Abu-Odeh ◽  
Juan de Dios de la O. Rami´rez
Keyword(s):  
Fatigue Life ◽  
Service Life ◽  
Oil And Gas ◽  
Gas Production ◽  
Strength Analysis ◽  
Offshore Platforms ◽  
Inspection Planning ◽  
Oil And Gas Production ◽  
Joint Flexibility ◽  
Joint Behavior

Pemex Exploration y Produccio´n owns and operates several fields in the Bay of Campeche, located in the south Gulf of Mexico, for oil and gas production. Many of these fixed offshore platforms were built during the 70s and 80s and have already exceeded their design service life. To meet the growing demand for oil and natural gas it was found economic to extend the service life for these platforms by at least another 15 to 30 years. To meet this extended service life, thorough and systematic reassessment studies need to be conducted leading to identification of any structural weakness and possible locations of fatigue problems. To extend the fatigue life of the welded joints, inspections are required to be performed according to a risk based inspection planning procedure. As a part of the reassessment study non-linear pushover and spectral fatigue analyses are conducted. The effect of joint behavior, viz. the local joint flexibility and strength, on the structural ultimate capacity and fatigue life is discussed in this paper. In conventional analysis the tubular joints are assumed to be rigid and the flexibility effects due to shell deformations are ignored. In this present paper, the effect of the joint behavior is included in the analysis and its implications on the results are discussed. For the ultimate strength analysis both API and MSL formulations for the load-deformation behavior of the joint are studied and compared. For the fatigue analyses, local joint flexibility modeling using Buitrago’s formulation is used. Results including and excluding these effects are compared. Effect of grouting of the joint is also studied. Comprehensive results of the study for a number of platforms, which cover the categories of Drilling, Production, Gathering and Habitation, are presented. The effects of local joint flexibility and joint strength on structural behavior have been recognized to be important in the recent publications of the recommended practices and the codes such as the API RP 2A. However, comprehensive discussions and the results of application of these aspects are rare in the published literature. This paper addresses these issues and presents the results of a large number of platforms of different configurations, indicates some noticeable trends and suggests some general conclusions.

Research on the Very-High-Cycle Fatigue Life Analysis of High-Speed Take-Up Winder

2014 ◽  
Vol 488-489 ◽  
pp. 1281-1284
Author(s):  
Yong Li ◽  
Wen Qin Liu ◽  
Zhou Yang
Keyword(s):  
Fatigue Life ◽  
Service Life ◽  
High Speed ◽  
High Cycle Fatigue ◽  
Fatigue Tests ◽  
Chemical Fiber ◽  
Cycle Fatigue ◽  
Life Analysis ◽  
Fatigue Life Analysis ◽  
Vibration Performance

The take-up winder is an important equipment of chemical fiber textile machinery. Vibration performance is the key to decide quality and service life of product. The modal of winder is analyzed. It is shown that the rotation speed cannot be kept away from fifth and sixth resonance frequency. The Maximum stress response is calculated by harmonic analysis. According to results of high-cycle fatigue tests, the service life of winder is evaluated. The results show that there is the risk of fatigue damage for small damp ratio. Unlimited fatigue life can be obtained by creasing damp ratio. It can be concluded that creasing damp is an effective way to improve the service life.

A Fatigue Life Analysis Method Based on Nominal Stress Method and MSC.FATIGUE Software

2012 ◽  
Vol 468-471 ◽  
pp. 663-667
Author(s):  
Da Shan Dong ◽  
Chun Yan Lu ◽  
Yuan Yuan Teng
Keyword(s):  
Fatigue Life ◽  
Design Method ◽  
Element Model ◽  
Nominal Stress ◽  
Design Stage ◽  
Strength Analysis ◽  
Balance Beam ◽  
Fatigue Design ◽  
Life Distributions ◽  
Fatigue Life Analysis

The paper is based on nominal stress method and MSC.FATIGUE software, adopts virtual fatigue design method, take cart balance beam of quayside container crane as an example, build its finite element model, conduct strength analysis on the balance beam and fatigue analysis under specified load course by MSC.Fatigue software, then obtain life distributions which can provide the basis of nichetargeting improvement and fatigue research in design stage. Through above analysis, it has been proved the feasibility of the method that the paper adopted, and it can greatly reduce the expense that the fatigue life testing brings about.

scholarly journals Failure Life Prediction of Hub Bearing in Composite Tooling

2020 ◽  
Vol 10 (14) ◽  
pp. 4707
Author(s):  
Jeong-Woo Han ◽  
Jeong-Gil Kim ◽  
Sang-Gon Moon ◽  
In-Kyung Shin ◽  
Seung-Je Cho ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Safety Factor ◽  
Contact Stress ◽  
Field Tests ◽  
Soil Conditions ◽  
Reconstruction Method ◽  
Bearing Contact ◽  
Composite Tooling ◽  
Bearing Loads ◽  
Failure Life

Composite work tools have many components, and complex shapes when compared to standard tools such as rotaries and plows. In addition, the component durability for the tools is critical because the load varies severely according to the soil conditions. This study predicts the fatigue life of the hub bearing in composite work tooling. The loads acting on the tools were measured based on field tests, and the loads acting on the hub bearing were derived using the load reconstruction method. The static safety factor and fatigue life of the hub bearing, loads, and contact stress acting on the inner and outer raceways and presence of truncation were analytically predicted based on the derived loads. The fatigue life of the bearing changed depending on the preload amount of the hub bearing. The bearing life was more than 3000 h for preloads of less than 40 μm, which satisfied the target life of 1200 h. The load acting on the inner and outer raceways of the bearing decreased and then increased as the preload amount of the bearing rose. The bearing contact area, maximum contact stress, and number of balls increased as the load applied to the hub bearing rose. The fatigue life, load, contact stress, and static safety factor of the hub bearing met all requirements, and no truncation occurred on the inner and outer raceways of the bearing. The test verified the achievement of the target life of 1200 h and confirmed that there was no breakage, cracking, or deformation of the bearing.

Analysis on Void Beneath Curling Slab in Rigid Base Cement Concrete Pavement and Fatigue Life Prediction

2012 ◽  
Vol 204-208 ◽  
pp. 1782-1788 ◽  
Author(s):  
Qing Zhang ◽  
Yun Chen Sun ◽  
Jing Jing Li
Keyword(s):  
Fatigue Life ◽  
Temperature Gradient ◽  
Service Life ◽  
Life Prediction ◽  
Concrete Pavement ◽  
Fatigue Life Prediction ◽  
Rigid Base ◽  
Cement Concrete ◽  
Cement Concrete Pavement ◽  
Fatigue Life Analysis

The damages in two rigid base cement concrete pavement were investigated. The data analysis suggests that the void beneath curling slab resulting from the temperature gradient changing leads to pavement damages. With the benefit of the pavement curling structure numerical model established in this article, the void changing law beneath curling slab and loading stress were analyzed. The loading stress level increases dramatically due to void occurring beneath curling slab. The calculation method of loading stress in the curling slab was given. The fatigue life analysis further reveals that the void beneath curling slab caused by temperature gradient changes is the fundamental reason for the decreasing of the service life of cement concrete pavement. The service life of investigating section were predicted and analyzed according to the fatigue life prediction model established in this article and the survey data.

Kontinuierliches Wälzschleifen*/Continuous gear grinding. Thermal and mechanical loads during continuous gear grinding with cBN grinding tools

2019 ◽  
Vol 109 (06) ◽  
pp. 473-478
Author(s):  
B. Denkena ◽  
T. Grove ◽  
P. Dzierzawa ◽  
F.L. Kempf
Keyword(s):  
Service Life ◽  
Thermal Damage ◽  
Gear Train ◽  
Measuring System ◽  
Grinding Process ◽  
Mechanical Loads ◽  
Gear Teeth ◽  
Gear Grinding ◽  
Grinding Tool ◽  
Thermische Schädigungen

Für die Leistung und die Standzeit der Zahnräder im Getriebe sind die Oberflächen- und Randzoneneigenschaften der Zähne entscheidend. Die Kenntnis der durch den Schleifprozess erzeugten Temperaturen ist von besonderem Interesse, da thermische Schädigungen ein Bauteil für den Einsatz unbrauchbar machen. Die Messung von Temperaturen nahe der Kontaktzone ist aufgrund der gekoppelten Rotation von Werkstück und Schleifwerkzeug aufwendig. Eine werkstückseitige Messung bietet eine einfachere Lösung dafür, die auch die Untersuchung unterschiedlicher Werkzeuge erlaubt.   Surface and subsurface properties of the gear teeth are crucial for the performance and service life of gears inside the gear train. The knowledge of temperatures generated by the grinding process is of particular interest, as thermal damage causes the gear to be unusable. The measurement of temperatures near the contact zone in this case is not trivial, due to the coupled rotation of workpiece and grinding tool. A measuring system attached to the workpiece offers a less complicated solution for this, and allows the examination of different tools.

Fatigue Life Analysis of Compressor Bracket of Car Air Conditioner

2014 ◽  
Vol 505-506 ◽  
pp. 319-322
Author(s):  
Wen Shan Wang ◽  
Hua Jie Wu ◽  
Zai Xiang Zheng ◽  
Jing Xu
Keyword(s):  
Fatigue Life ◽  
Fatigue Test ◽  
Fatigue Failure ◽  
Vibration Test ◽  
Air Conditioner ◽  
Displacement Distribution ◽  
Vibration Fatigue ◽  
Life Analysis ◽  
Simulation Results ◽  
Fatigue Life Analysis

the compressor bracket of car air conditioner frequently breaks and fatigue failure of its welding beam frequently occur in the vibration fatigue test. In order to solve these problems, the static stress and displacement distribution of mounting bracket are given under the effect of different acceleration by using FEM software in the paper. Simulation results show that revised design of the mounting bracket achieves success and its stiffness, strength and fatigue life satisfy the requirements of vibration test.

Fatigue Life Analysis of the Bolt

2011 ◽  
Vol 121-126 ◽  
pp. 259-262
Author(s):  
Zhong Chao Chen ◽  
Ji Min Zhang
Keyword(s):  
Fatigue Life ◽  
Service Life ◽  
Shear Force ◽  
Static Load ◽  
Tensile Force ◽  
Fatigue Load ◽  
Safety Coefficient ◽  
Experiment Platform ◽  
Life Analysis ◽  
Fatigue Life Analysis

For the bolts on the experiment table, there are two main kinds of forces, namely, shear force and tensile force. This paper will test these two different forces that the bolts received, verifying their compliance with the service life. Finding out which situation is better by comparing the safety coefficient under the static load and the fatigue life under the fatigue load. And then put forward some reasonable measures for improving to make the bolts meet the fatigue life of the experiment platform.

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