Performance analysis of asymmetric toothed strain wave gear

2021 ◽  
pp. 095440622110157
Author(s):  
Bikash Routh ◽  
Vineet Sahoo ◽  
Andrzej Sobczyk
Keyword(s):  
Performance Analysis ◽  
Contact Stress ◽  
Carrying Capacity ◽  
Load Carrying Capacity ◽  
Harmonic Drive ◽  
Strain Wave ◽  
Pressure Angle ◽  
Load Carrying

Strain Wave Gear (SWG) or Harmonic Drive (HD) shows moderate performance under symmetrical involute teeth. Teeth interference, excessive teeth meshing, vibration due to improper teeth engagement are the major drawbacks of strain wave gear under symmetrical involute teeth. In the present paper, an attempt has been made to improve the performance of strain wave gear by replacing the symmetrical involute teeth with asymmetrical involute teeth. Present investigation finds that under ‘asymmetric toothed strain wave gear’, aspects such as teeth interference, teeth engagement and teeth contact stress of strain wave gear are improving clearly and as a consequence some other aspects such as individual teeth strength, load carrying capacity, tooth endurance are also improving inherently. In the present analysis for symmetrical teeth 20°–20° pressure angle and for asymmetrical teeth, three different combinations of pressure angles such as 25°–20°, 30°–20° and 35°–20° are taken.

scholarly journals Contact Analysis and Static Load Carrying Capacity of Planetary Roller Screw Mechanism

2020 ◽  
Author(s):  
Nam Su Kim ◽  
Kyongho Kim ◽  
Sinhyok Jong
Keyword(s):  
Finite Element ◽  
Contact Stress ◽  
Carrying Capacity ◽  
Static Load ◽  
Load Capacity ◽  
Load Carrying Capacity ◽  
Elastic Plastic ◽  
Load Carrying ◽  
Roller Screw ◽  
Screw Mechanism

Abstract This paper aims to investigate the contact characteristics and static load carrying capacity of planetary roller screw mechanism (PRSM). Compared to the ball screw mechanism, the advantages of the PRSM are high stiffness, high load capacity, long travel life and compact structure, etc., since the PRSM possesses more contact points than ball screws in a comparable size. The actuated load is carried through the threaded surface contacts of the screw, the rollers and the nut and the contact characteristics of these components are very important for studying the wear, transmission accuracy and efficiency of a PRSM. Prior work has neglected to take a fundamental approach towards understanding the elastic-plastic contact characteristics of threaded surfaces under high loads and it is closely related to the static load carrying capacity of PRSM. Accordingly, in this paper, the contact characteristics of PRSM under the different working loads are modeled based on Hertz contact theory and the calculation formulas between normal force of thread turns and the elastic-plastic contact stress and deformation are derived. Then, it goes further to derive a calculation method of static load carrying capacity of PRSM based on simplified model of static load distribution. Finally, a verification model is developed by finite element method (FEM) to perform contact stress and strain analysis of PRSM. Besides, through the comparison of the results between the theory model and ANSYS Workbench finite element model verify the reliability of the theory.

Performance Analysis of Polyacrylonitrile Fiber Concrete on Airport Pavement

2011 ◽  
Vol 374-377 ◽  
pp. 1467-1472
Author(s):  
Hai Xin Ma ◽  
Ran An
Keyword(s):  
Performance Analysis ◽  
Carrying Capacity ◽  
Impact Resistance ◽  
Plain Concrete ◽  
Polyacrylonitrile Fiber ◽  
Load Carrying Capacity ◽  
Airport Pavement ◽  
Load Carrying ◽  
Fiber Concrete ◽  
Resistance Performance

Properties of plain concrete and polyacrylonitrile fiber concrete, including fatigue resistance performance，flexural toughness and impact resistance performance were respectively studied．Improved effect on airport pavement classification number(PCN)by the addition of polyacrylonitrile fiber in concrete was then analyzed．Experiment results showed that all property indexes of concrete increased greatly，and pavement classification number also was enhanced by the percentage of 8.4．In this way，load-carrying capacity of airport pavement was enhanced greatly．

Correlation of Relevant Case Properties and the Flank Load Carrying Capacity of Case-Hardened Gears

2015 ◽  
Author(s):  
Johannes Koenig ◽  
Peter Koller ◽  
Thomas Tobie ◽  
Karsten Stahl
Keyword(s):  
Contact Stress ◽  
Carrying Capacity ◽  
Shot Peening ◽  
Positive Influence ◽  
The Other ◽  
Load Carrying Capacity ◽  
Load Carrying ◽  
Relevant Case ◽  
Tooth Flank ◽  
Current Standards

The flank load carrying capacity of case-hardened gears is significantly influenced by the condition of the case properties. A negatively influenced case, e.g. due to grinding burn, may result in a significantly reduced load carrying capacity of the tooth flank. On the other hand, additional finishing methods such as shot peening and superfinishing allow a positive influence on the case properties, resulting in a further increase of the tooth flank load carrying capacity. The variation of the case properties is not adequately taken into account by the current standards DIN 3990 / ISO 6336. This paper summarizes the results of the FVA research project 521 I. This project investigated the effects of shot peening and superfinishing on the tooth flank load carrying capacity. Based on the experimental results, an extension of the calculation method for the permissible contact stress σHP is proposed.

Performance Analysis of Magnetite Nano-Suspension Based Porous Slider Bearing with Varying Inclination and Slip Parameter

2017 ◽  
Vol 11 ◽  
pp. 11-21 ◽  
Author(s):  
Paras Ram ◽  
Anil Kumar ◽  
Oluwole Daniel Makinde ◽  
Punit Kumar ◽  
Vimal Kumar Joshi
Keyword(s):  
Performance Analysis ◽  
Magnetic Permeability ◽  
Carrying Capacity ◽  
Load Carrying Capacity ◽  
Performance Parameters ◽  
Slip Parameter ◽  
Slider Bearing ◽  
Material Parameters ◽  
Load Carrying

Performance analysis of porous inclined slider bearing based on magnetite nanosuspension has been carried out to investigate the effects of slip parameter arising out of modeling. The expression for load carrying capacity has been derived analytically as a function of slip, magnetic, permeability and material parameters. Furthermore, the effect of an important term pertaining to the co-rotational derivative of magnetization is usually ignored by the researchers working on similar problems. However, as this term is expected to influence the load carrying capacity significantly, this paper investigates its effect on the bearing performance parameters under the present conditions. Besides, the effect of varying the inlet-outlet ratio has also been studied. It has been found that with an increase in the inlet-outlet ratio up to an optimum value, the load carrying capacity increases followed by a decreasing trend.

S1120502 Influence of Low Pressure Angle on Load Carrying Capacity of Crossed Helical Gears

2015 ◽  
Vol 2015 (0) ◽  
pp. _S1120502--_S1120502-
Author(s):  
Ryozo NEMOTO ◽  
Ema TAMURA ◽  
Natsuhiko SEYAMA ◽  
Eiichirou TANAKA
Keyword(s):  
Carrying Capacity ◽  
Low Pressure ◽  
Load Carrying Capacity ◽  
Helical Gears ◽  
Pressure Angle ◽  
Load Carrying

Performance Analysis of the Flotation Cushion with Elastic Pressure Equalizing Groove for Aerostatic Slideway

2012 ◽  
Vol 152-154 ◽  
pp. 743-748 ◽  
Author(s):  
Jun An Zhang ◽  
Hao Dong ◽  
Fang Jie Ma ◽  
Bo Liu
Keyword(s):  
Performance Analysis ◽  
Theoretical Analysis ◽  
Governing Equation ◽  
Elastic Plate ◽  
Carrying Capacity ◽  
Load Carrying Capacity ◽  
Load Carrying ◽  
Variable Section ◽  
New Type ◽  
Coupling Calculation

In order to improve stiffness of the flotation cushion, a new type of flotation cushion with variable-section pressure equalizing groove of elastic plate for aerostatic slideway was designed. Gas film pressure distribution and load carrying capacity of this flotation cushion was studied through theoretical analysis. The grid was generated by taking advantage of overlapping stitching technique. By using the coupling calculation of the gas lubrication governing equation and elastic deformation of thin plate governing equation, the load carrying capacity and stiffness of the new flotation cushion were obtained. Some experiments were made to verify the result of theoretical calculation. The experimental results show that the stiffness of new flotation cushion is much higher than conventional flotation cushion.This new flotation cushion has a wider application space.

Influence of Yield Strength Variability over Cross-Section to Steel Beam Load-Carrying Capacity

2005 ◽  
Vol 10 (2) ◽  
pp. 151-160 ◽  
Author(s):  
J. Kala ◽  
Z. Kala
Keyword(s):  
Yield Strength ◽  
Cross Section ◽  
Carrying Capacity ◽  
Bending Moment ◽  
Statistical Characteristics ◽  
Load Carrying Capacity ◽  
Load Carrying ◽  
Strength Variability ◽  
Hot Rolled ◽  
Hot Rolled Steel

Authors of article analysed influence of variability of yield strength over cross-section of hot rolled steel member to its load-carrying capacity. In calculation models, the yield strength is usually taken as constant. But yield strength of a steel hot-rolled beam is generally a random quantity. Not only the whole beam but also its parts have slightly different material characteristics. According to the results of more accurate measurements, the statistical characteristics of the material taken from various cross-section points (e.g. from a web and a flange) are, however, more or less different. This variation is described by one dimensional random field. The load-carrying capacity of the beam IPE300 under bending moment at its ends with the lateral buckling influence included is analysed, nondimensional slenderness according to EC3 is λ¯ = 0.6. For this relatively low slender beam the influence of the yield strength on the load-carrying capacity is large. Also the influence of all the other imperfections as accurately as possible, the load-carrying capacity was determined by geometrically and materially nonlinear solution of very accurate FEM model by the ANSYS programme.

Fuzzy Sets Theory in Comparison with Stochastic Methods to Analyse Nonlinear Behaviour of a Steel Member under Compression

2005 ◽  
Vol 10 (1) ◽  
pp. 65-75 ◽  
Author(s):  
Z. Kala
Keyword(s):  
Fuzzy Sets ◽  
Carrying Capacity ◽  
Stochastic Methods ◽  
Nonlinear Behaviour ◽  
Load Carrying Capacity ◽  
Load Carrying ◽  
Input Parameters ◽  
Stochastic Solution ◽  
Fuzzy Solution ◽  
Sets Theory

The load-carrying capacity of the member with imperfections under axial compression is analysed in the present paper. The study is divided into two parts: (i) in the first one, the input parameters are considered to be random numbers (with distribution of probability functions obtained from experimental results and/or tolerance standard), while (ii) in the other one, the input parameters are considered to be fuzzy numbers (with membership functions). The load-carrying capacity was calculated by geometrical nonlinear solution of a beam by means of the finite element method. In the case (ii), the membership function was determined by applying the fuzzy sets, whereas in the case (i), the distribution probability function of load-carrying capacity was determined. For (i) stochastic solution, the numerical simulation Monte Carlo method was applied, whereas for (ii) fuzzy solution, the method of the so-called α cuts was applied. The design load-carrying capacity was determined according to the EC3 and EN1990 standards. The results of the fuzzy, stochastic and deterministic analyses are compared in the concluding part of the paper.

Pavement Damage Due to Conventional and New Generation of Wide-Base Super Single Tires

2005 ◽  
Vol 33 (4) ◽  
pp. 210-226 ◽  
Author(s):  
I. L. Al-Qadi ◽  
M. A. Elseifi ◽  
P. J. Yoo ◽  
I. Janajreh
Keyword(s):  
Carrying Capacity ◽  
Material Properties ◽  
Three Dimensional ◽  
Fe Analysis ◽  
Load Carrying Capacity ◽  
Inflation Pressure ◽  
3D Finite Element ◽  
Load Carrying ◽  
Pavement Damage ◽  
New Generation

Abstract The objective of this study was to quantify pavement damage due to a conventional (385/65R22.5) and a new generation of wide-base (445/50R22.5) tires using three-dimensional (3D) finite element (FE) analysis. The investigated new generation of wide-base tires has wider treads and greater load-carrying capacity than the conventional wide-base tire. In addition, the contact patch is less sensitive to loading and is especially designed to operate at 690kPa inflation pressure at 121km/hr speed for full load of 151kN tandem axle. The developed FE models simulated the tread sizes and applicable contact pressure for each tread and utilized laboratory-measured pavement material properties. In addition, the models were calibrated and properly validated using field-measured stresses and strains. Comparison was established between the two wide-base tire types and the dual-tire assembly. Results indicated that the 445/50R22.5 wide-base tire would cause more fatigue damage, approximately the same rutting damage and less surface-initiated top-down cracking than the conventional dual-tire assembly. On the other hand, the conventional 385/65R22.5 wide-base tire, which was introduced more than two decades ago, caused the most damage.

Sign in / Sign up

Export Citation Format

Share Document