Gear Rating and Contact Pattern Analysis for Rotavator Gearbox Using Actual Working Load

Abstract This paper presents a new non-elliptical wave generator for strain wave gear to improve its contact pattern quality. The new wave generator has a polynomial profile at one cross section, then crowned along the lead direction. The lead crowning uses a parabolic function with crowning amount controlled by parabolic coefficient. Loaded tooth contact pattern analysis based on finite element method is used to evaluate the new design. The result shows that the new design will avoid the edge contact between wave generator and flexspline, which reduces contact pressure and improve the wearing life of the gear. It also improves the contact pattern quality of the tooth surface. Comparing with elliptical wave generator, the new wave generator with polynomial profile and lead parabolic crowned surface offers more design freedom to improve strain wave gear’s performance. The parametric equation of the new wave generator is defined intuitively, and it can be easily adapted for any type of strain wave gear. Furthermore, the finite element model for the strain wave gear is a new development and application for Loaded Tooth Contact Analysis (LTCA).

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Contact Pattern Analysis: Simulation of a Laser-Assisted Thermographic Approach

International Journal of Thermophysics ◽

10.1007/s10765-016-2090-9 ◽

2016 ◽

Vol 37 (8) ◽

Author(s):

H. Prekel ◽

G. Stroebel ◽

R. Lipinski ◽

G. Goch

Keyword(s):

Pattern Analysis ◽

Contact Pattern

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Experimental contact pattern analysis for a gear-rack system

Meccanica ◽

10.1007/s11012-010-9415-8 ◽

2011 ◽

Vol 47 (1) ◽

pp. 51-61 ◽

Cited By ~ 7

Author(s):

Massimiliano Pau ◽

Bruno Leban ◽

Antonio Baldi ◽

Francesco Ginesu

Keyword(s):

Pattern Analysis ◽

Contact Pattern ◽

Gear Rack

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Foot contact pattern analysis in hemiplegic stroke patients: An implication for neurologic status determination11No commercial party having a direct financial interest in the results of the research supporting this article has or will confer a benefit upon the authors(s) or upon any organization with which the author(s) is/are associated.

Archives of Physical Medicine and Rehabilitation ◽

10.1016/j.apmr.2003.11.039 ◽

2004 ◽

Vol 85 (10) ◽

pp. 1625-1630 ◽

Cited By ~ 33

Author(s):

Alice M. Wong ◽

Yu-Cheng Pei ◽

Wei-Hsien Hong ◽

Chia-Yin Chung ◽

Yiu-Chung Lau ◽

...

Keyword(s):

Pattern Analysis ◽

Contact Pattern ◽

Stroke Patients ◽

Neurologic Status ◽

Financial Interest

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Contact pattern analysis in globoidal worm gear performed in CAD environment

Mechanik ◽

10.17814/mechanik.2018.1.16 ◽

2018 ◽

Vol 91 (1) ◽

pp. 70-72

Author(s):

Piotr Połowniak ◽

Mariusz Sobolak

Keyword(s):

Pattern Analysis ◽

Tooth Profile ◽

Worm Gear ◽

Central Plane ◽

Contact Pattern ◽

Pressure Angle ◽

Shape And Size

Presented is the method of determining the contact pattern in globoidal worm gear using CAD environment. Contact pattern analysis was performed for the gear with straight tooth profile in the central plane. The influence of the pressure angle on the shape and size of the contact pattern was investigated.

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A Systems Approach to Determining Actual Misalignment and Load Distribution for Cylindrical Roller Bearings in Commercial Gear Trains

Journal of Lubrication Technology ◽

10.1115/1.3452983 ◽

1977 ◽

Vol 99 (1) ◽

pp. 41-46 ◽

Cited By ~ 1

Author(s):

N. K. Bhardwaj ◽

E. E. Pfaffenberger ◽

W. J. Derner

Keyword(s):

Load Distribution ◽

Pattern Analysis ◽

Systems Approach ◽

Gear Train ◽

Contact Pattern ◽

Actual Distribution ◽

Roller Bearings ◽

Analysis Technique ◽

Edge Loading ◽

Cylindrical Roller

The Contact Pattern Analysis technique was used to determine the actual distribution of load among rollers, misalignment, and roller edge loading effects in cylindrical roller bearings in a commercial gear train. In all the bearings in the system, the summation of the vertical components of individual roll body loads determined from Contact Pattern Analysis agreed well with the total load imposed on the bearing by the system, thereby demonstrating the practicability and accuracy of the technique. In a few cases the load distribution among rollers in the bearing and, in one case, the number of rollers loaded, were found to be far from ideal. Similarly, it was found that the direction of the bearing reaction differed significantly from the applied load direction. The misalignment as calculated from the contacts was .003 to .005 mm/mm. Also, evidence of contact truncation and roller edge loading at peak torque loads were found. Thus this systems approach, utilizing the Contact Pattern Analysis technique revealed several anomalies that suggest adjusting system parameters, such as housing stiffness and/or roller crown, to improve bearing reliability and performance. This could not have been done by any other known analytical technique.

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Automated Image Analysis Of Nuclear And Cytoplasmic Changes In Exfoliated Cells From Tracheas Treated With Carcinogen

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100078638 ◽

1977 ◽

Vol 35 ◽

pp. 220-221

Author(s):

S.F. Stinson ◽

J.C. Lilga ◽

M.B. Sporn

Keyword(s):

Image Analysis ◽

Pattern Analysis ◽

Relative Proportion ◽

Automated Image Analysis ◽

Image Analyzer ◽

Cross Sectional ◽

Exfoliated Cells ◽

Neoplastic Lesions ◽

Analysis System ◽

Morphologic Criterion

Increased nuclear size, resulting in an increase in the relative proportion of nuclear to cytoplasmic sizes, is an important morphologic criterion for the evaluation of neoplastic and pre-neoplastic cells. This paper describes investigations into the suitability of automated image analysis for quantitating changes in nuclear and cytoplasmic cross-sectional areas in exfoliated cells from tracheas treated with carcinogen.Neoplastic and pre-neoplastic lesions were induced in the tracheas of Syrian hamsters with the carcinogen N-methyl-N-nitrosourea. Cytology samples were collected intra-tracheally with a specially designed catheter (1) and stained by a modified Papanicolaou technique. Three cytology specimens were selected from animals with normal tracheas, 3 from animals with dysplastic changes, and 3 from animals with epidermoid carcinoma. One hundred randomly selected cells on each slide were analyzed with a Bausch and Lomb Pattern Analysis System automated image analyzer.

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An Interactive Minicomputer Program for the Indexing and Simulation of Electron Diffraction Patterns

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100092670 ◽

1976 ◽

Vol 34 ◽

pp. 542-543

Author(s):

R.P. Goehner ◽

W.T. Hatfield ◽

Prakash Rao

Keyword(s):

Electron Diffraction ◽

Real Time ◽

Pattern Analysis ◽

Flow Diagram ◽

Hard Copy ◽

Time Analysis ◽

Real Time Analysis ◽

Transmission Electron ◽

One Step ◽

Diffraction Patterns

Computer programs are now available in various laboratories for the indexing and simulation of transmission electron diffraction patterns. Although these programs address themselves to the solution of various aspects of the indexing and simulation process, the ultimate goal is to perform real time diffraction pattern analysis directly off of the imaging screen of the transmission electron microscope. The program to be described in this paper represents one step prior to real time analysis. It involves the combination of two programs, described in an earlier paper(l), into a single program for use on an interactive basis with a minicomputer. In our case, the minicomputer is an INTERDATA 70 equipped with a Tektronix 4010-1 graphical display terminal and hard copy unit.A simplified flow diagram of the combined program, written in Fortran IV, is shown in Figure 1. It consists of two programs INDEX and TEDP which index and simulate electron diffraction patterns respectively. The user has the option of choosing either the indexing or simulating aspects of the combined program.

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