Turning Process Identification Through Force Transients

1992 ◽  
Vol 114 (1) ◽  
pp. 1-7 ◽  
Author(s):  
R. Nair ◽  
K. Danai ◽  
S. Malkin
Keyword(s):  
Simple Model ◽  
Cutting Force ◽  
Chip Formation ◽  
Cross Sectional Area ◽  
Cutting Edge ◽  
Sectional Area ◽  
Turning Process ◽  
Cross Sectional ◽  
Process Identification ◽  
Residual Component

A method is presented for identifying the chip formation, plowing, and sliding forces in turning from force transients. For this purpose, a simple model is used which separates the cutting force into a sharp tool chip formation component and a residual component associated with both rubbing between the wear land and the workpiece and plowing at the cutting edge. Variations of the cross-sectional area of the cut during a transient are used to tune the model and estimate its parameters.

Relationships Between Cutting Force Variations and Cutting Factors in Plain Milling Operations. Part 1: Plain Milling With a Single-Toothed Helical Cutter

1981 ◽  
Vol 103 (2) ◽  
pp. 165-173
Author(s):  
S. Kato ◽  
T. Yamada ◽  
M. Hashimoto ◽  
K. Yamaguchi
Keyword(s):  
Cutting Force ◽  
Optical Method ◽  
Constant Width ◽  
Cross Sectional Area ◽  
Experimental Results ◽  
Sectional Area ◽  
Cross Sectional ◽  
Milling Operations ◽  
Variation Patterns ◽  
Force Variation

In plain milling operations with a single-toothed helical cutter, three components of cutting force are measured simultaneously and continuously corresponding to the varying cross-sectional area of cut by means of a unique optical method. Based on the measured cutting force variation in a constant width of cut, some required cutting force variations in various widths of cut can be obtained by summing up the overlapped basic cutting force variation patterns. Relationships between cutting force variations and cutting factors in plain milling operations are explained on the basis of the experimental results and the expanded results of experiments.

Some Characteristic Parameters of the Run-In Phase in Rotational Turning and their Determination

2014 ◽  
Vol 474 ◽  
pp. 405-410
Author(s):  
István Sztankovics ◽  
János Kundrák
Keyword(s):  
Axial Length ◽  
Cross Sectional Area ◽  
Cutting Edge ◽  
Sectional Area ◽  
Characteristic Parameters ◽  
Cross Sectional ◽  
Helical Geometry ◽  
Rotational Turning ◽  
Tool Rotation

In rotational turning the kinematic relations between the tool and the workpiece are different from traditional turning. The cutting edge is more complex (can be typified by helical geometry) and the feed motion is the result of the tool rotation. Therefore, the characteristic parameters of the procedure must be determined by methods different from traditional turning. In this article we determine some characteristic parameters of the cutting run-in phase (which ends if the chip cross-sectional area becomes constant): the axial length, the needed rotation of the tool and the duration.

Pelvic Canal Narrowing Caused by Triple Pelvic Osteotomy in the Dog

1994 ◽  
Vol 07 (03) ◽  
pp. 110-113 ◽  
Author(s):  
D. L. Holmberg ◽  
M. B. Hurtig ◽  
H. R. Sukhiani
Keyword(s):  
Postoperative Complications ◽  
Pelvic Osteotomy ◽  
Cross Sectional Area ◽  
Sectional Area ◽  
Cross Sectional ◽  
Canal Width ◽  
Operative Complications ◽  
Post Operative Complications

SummaryDuring a triple pelvic osteotomy, rotation of the free acetabular segment causes the pubic remnant on the acetabulum to rotate into the pelvic canal. The resulting narrowing may cause complications by impingement on the organs within the pelvic canal. Triple pelvic osteotomies were performed on ten cadaver pelves with pubic remnants equal to 0, 25, and 50% of the hemi-pubic length and angles of acetabular rotation of 20, 30, and 40 degrees. All combinations of pubic remnant lengths and angles of acetabular rotation caused a significant reduction in pelvic canal-width and cross-sectional area, when compared to the inact pelvis. Zero, 25, and 50% pubic remnants result in 15, 35, and 50% reductions in pelvic canal width respectively. Overrotation of the acetabulum should be avoided and the pubic remnant on the acetabular segment should be minimized to reduce postoperative complications due to pelvic canal narrowing.When performing triple pelvic osteotomies, the length of the pubic remnant on the acetabular segment and the angle of acetabular rotation both significantly narrow the pelvic canal. To reduce post-operative complications, due to narrowing of the pelvic canal, overrotation of the acetabulum should be avoided and the length of the pubic remnant should be minimized.

DETERMINATION OF THE FUNCTION OF THE ROD’S CROSS-SECTIONAL AREA USING VIBRATION EIGENFREQUENCIES

2020 ◽  
Vol 0 (4) ◽  
pp. 19-24
Author(s):  
I.M. UTYASHEV ◽  
◽  
A.A. AITBAEVA ◽  
A.A. YULMUKHAMETOV ◽  
◽  
...  
Keyword(s):  
Cross Sectional Area ◽  
Variable Cross ◽  
Sectional Area ◽  
Longitudinal Vibrations ◽  
Cross Sectional ◽  
Method Error ◽  
Various Boundary Conditions ◽  
Elastic Fixation ◽  
Crosssectional Area

The paper presents solutions to the direct and inverse problems on longitudinal vibrations of a rod with a variable cross-sectional area. The law of variation of the cross-sectional area is modeled as an exponential function of a polynomial of degree n . The method for reconstructing this function is based on representing the fundamental system of solutions of the direct problem in the form of a Maclaurin series in the variables x and λ. Examples of solutions for various section functions and various boundary conditions are given. It is shown that to recover n unknown coefficients of a polynomial, n eigenvalues are required, and the solution is dual. An unambiguous solution was obtained only for the case of elastic fixation at one of the rod’s ends. The numerical estimation of the method error was made using input data noise. It is shown that the error in finding the variable crosssectional area is less than 1% with the error in the eigenvalues of longitudinal vibrations not exceeding 0.0001.

Changes in the parameters of nasal breathing and parameters of the upper respiratory tract during orthognathic operations in patients with II and III skeletal class of jaw anomalies

2020 ◽  
pp. 22-27
Author(s):  
S.Sh. Gammadaeva ◽  
M.I. Misirkhanova ◽  
A.Yu. Drobyshev
Keyword(s):  
Respiratory Tract ◽  
Nasal Cavity ◽  
Nasal Septum ◽  
Cross Sectional Area ◽  
Upper Respiratory Tract ◽  
Sectional Area ◽  
Nasal Breathing ◽  
Cross Sectional ◽  
Skeletal Class ◽  
Upper Respiratory

The study analyzed the functional parameters of nasal breathing, linear parameters of the nasal aperture, nasal cavity and nasopharynx, volumetric parameters of the upper airways in patients with II and III skeletal class of jaw anomalies before and after orthognathic surgery. The respiratory function of the nose was assessed using a rhinomanometric complex. According to rhinoresistometry data, nasal resistance and hydraulic diameter were assessed. According to the data of acoustic rhinometry, the minimum cross-sectional area along the internal valve, the minimum cross-sectional area on the head of the inferior turbinate and nasal septum and related parameters were estimated. According to the CBCT data, the state of the nasal septum, the inferior turbinates, the nasal aperture, the state of the nasal cavity, and the linear values of the upper respiratory tract (nasopharynx) were analyzed. The patients were divided into 4 groups according to the classification of the patency of the nasal passages by

Unequal Probability Scheme for Fruit Count in a Guava Tree

2016 ◽  
Vol 3 (4) ◽  
Author(s):  
R. C. BHARATI
Keyword(s):  
Cross Sectional Area ◽  
Equal Probability ◽  
Sampling Scheme ◽  
Research Station ◽  
Sectional Area ◽  
Cross Sectional ◽  
Unequal Probability ◽  
Selection Probabilities ◽  
Horticultural Research ◽  
Number Of Branches

Data on fruit count corresponding to primary, secondary and tertiary branches of a randomly selected guava CV. Allahabad Safeda were recorded from the guava orchard of Horticultural Research Station, Birauli. The proposed sampling scheme in which the selection probabilities are based on length of braches between two forking points was compared with equal probability(PE), probability proportional to the number of branches(PPN), probability proportional to the cross sectional area (PPA) and probability proportional to volume (PPV) method of sampling and found to be more efficient.

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