PCCONTUR VERSION 1.0: a microcomputer general purpose contouring program, Part B - Executable PCCONTUR and test data disk

1988 ◽  
Author(s):  
Richard H. Godson ◽  
Robert E. Bracken ◽  
Michael W. Webring
Keyword(s):  
Test Data ◽  
General Purpose ◽  
Data Disk

Torque of Tapered Roller Bearings

1991 ◽  
Vol 113 (3) ◽  
pp. 590-597 ◽  
Author(s):  
R. S. Zhou ◽  
M. R. Hoeprich
Keyword(s):  
Film Thickness ◽  
Test Data ◽  
Roller Bearing ◽  
Elastohydrodynamic Lubrication ◽  
General Purpose ◽  
Operating Conditions ◽  
Composite Surface ◽  
Tapered Roller Bearing ◽  
Wide Range ◽  
Tapered Roller

An analytic tapered roller bearing torque model is presented along with laboratory test data. Initial results of this proposed model are favorable. An accurate general purpose torque prediction tool could be obtained by extending the concepts presented in conjunction with a more comprehensive analysis of actual bearing operating conditions. By using EHL (Elastohydrodynamic Lubrication) theory and micro-macro contact analysis, the bearing torque can be determined by predicting each torque component for each roller due to raceway rolling, raceway moments due to EHL pressure distribution, and frictional force of rib-roller end contact. The roughness effect of contact surfaces, effect of EHL film thickness parameter (the ratio of film thickness to composite surface roughness), and thermal EHL effects are also included. A bearing torque test rig, which can measure the torque of cup race, cone race, and rib separately, was built and used to provide test data. Good agreement between the experimentally measured bearing torques and the predictions of the new torque model has been obtained. This torque model will provide a greater fundamental understanding and is more versatile over a wide range of operating conditions.

Identification of Properties of Nonlinear Joints Using Dynamic Test Data

1998 ◽  
Vol 120 (2) ◽  
pp. 324-330 ◽  
Author(s):  
Y. Ren ◽  
T. M. Lim ◽  
M. K. Lim
Keyword(s):  
Experimental Data ◽  
Test Data ◽  
Measurement Errors ◽  
Dynamic Properties ◽  
Experimental Studies ◽  
Dynamic Test ◽  
General Purpose ◽  
Nonlinear Properties ◽  
Nonlinear Force ◽  
Nonlinear Joints

This paper presents a general purpose technique for identifying (extracting) the dynamic properties of nonlinear joints using dynamic test data. No theoretical model is required, only experimental data are needed for the identification. Because no assumption on the properties of the nonlinear joints is made, the method is applicable for identifying almost any type of nonlinear joints. In the identification method, the nonlinear force at a joint is treated as an external force and the principle of multi-harmonic balance is employed. The force-response relationship of a nonlinear joint is then obtained. Various measurement errors in experimental data can affect the accuracy of identification. In this paper, efforts are also devoted to understanding how the accuracy of identification is affected by measurement errors. Techniques for improving the accuracy of identification are also discussed. The method is verified by experimental studies. The nonlinear properties of an impact joint and a friction joint have been successfully identified.

scholarly journals Numerical Modeling of Flow Distribution in Microfluidics Systems

2005 ◽  
Author(s):  
Alok Majumdar ◽  
Helen Cole ◽  
C. P. Chen
Keyword(s):  
Test Data ◽  
Flow Distribution ◽  
Mass Conservation ◽  
Momentum Conservation ◽  
Conservation Equation ◽  
General Purpose ◽  
Fluid Network ◽  
Micro Channels ◽  
General Purpose Computer ◽  
Successive Substitution

This paper describes an application of a general purpose computer program, GFSSP (Generalized Fluid System Simulation Program) for calculating flow distribution in a network of micro-channels. GFSSP employs a finite volume formulation of mass and momentum conservation equations in a network consisting of nodes and branches. Mass conservation equation is solved for pressures at the nodes while the momentum conservation equation is solved at the branches to calculate flowrate. The system of equations describing the fluid network is solved by a numerical method that is a combination of the Newton-Raphson and successive substitution methods. The numerical results have been compared with test data and detailed CFD (computational Fluid Dynamics) calculations. The agreement between test data and predictions is satisfactory. The discrepancies between the predictions and test data can be attributed to the frictional correlation which does not include the effect of surface tension or electro-kinetic effect.

Test Validation Without Measurement

2016 ◽  
Vol 32 (3) ◽  
pp. 204-214 ◽  
Author(s):  
Emilie Lacot ◽  
Mohammad H. Afzali ◽  
Stéphane Vautier
Keyword(s):  
Test Data ◽  
Test Scores ◽  
Scientific Explanation ◽  
Test Validation ◽  
Clinical Tests ◽  
Ethical Perspective ◽  
Power Of Test ◽  
Memory Accuracy ◽  
Social Uses ◽  
Special Case

Abstract. Test validation based on usual statistical analyses is paradoxical, as, from a falsificationist perspective, they do not test that test data are ordinal measurements, and, from the ethical perspective, they do not justify the use of test scores. This paper (i) proposes some basic definitions, where measurement is a special case of scientific explanation; starting from the examples of memory accuracy and suicidality as scored by two widely used clinical tests/questionnaires. Moreover, it shows (ii) how to elicit the logic of the observable test events underlying the test scores, and (iii) how the measurability of the target theoretical quantities – memory accuracy and suicidality – can and should be tested at the respondent scale as opposed to the scale of aggregates of respondents. (iv) Criterion-related validity is revisited to stress that invoking the explanative power of test data should draw attention on counterexamples instead of statistical summarization. (v) Finally, it is argued that the justification of the use of test scores in specific settings should be part of the test validation task, because, as tests specialists, psychologists are responsible for proposing their tests for social uses.

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