Results 241 to 250 of about 1,075,531 (290)

Errors of thermal-energy measurements

Measurement Techniques, 2000
It is shown that systematic errors play a significant role in thermal-energy measurements while random errors are negligible. Algebraic summation of the error components is recommended for evaluation of the errors of heat meters; quadratic summation is recommended for evaluation of thermal-energy errors.
Zh. F. Kudryashova, V. I. Mishustin
openaire   +1 more source

Machine Tool Thermal Error Reduction—an Appraisal

Proceedings of the I MECH E Part B Journal of Engineering Manufacture, 1999
It has been shown that machine tool thermal distortion can account for 75 per cent of the total machining error. As a result there has been a great deal of interest in techniques for reducing thermal errors. The approaches taken to thermal error reduction can be divided into two broad categories of reducing structural temperature change and reducing ...
S R Postlethwaite, J P Allen, D G Ford
openaire   +1 more source

Thermal Error Measurement and Real Time Compensation System for the CNC Machine Tools Incorporating the Spindle Thermal Error and the Feed Axis Thermal Error

The International Journal of Advanced Manufacturing Technology, 2002
Thermally induced errors have been significant factors affecting machine tool accuracy. In this paper, the thermal spindle error and thermal feed axis error have been considered, and a measurement/compensation system for thermal error is introduced. Several modelling techniques for thermal errors are also implemented for the thermal error prediction; i.
H. Pahk, S.W. Lee
openaire   +1 more source

Errors in Thermal Measurements

Nature, 1932
PROF. PARTINGTON directs attention1 to errors which are likely to be present when resistance thermometers are used in measurements of heats of adsorption. He does not refer to thermocouple thermometers directly, but he includes in his references papers which describe their use.
openaire   +2 more sources

Thermal error of a hydrostatic spindle

Precision Engineering, 2011
This paper proposes a thermo-mechanical error model of a hydrostatic spindle for a high precision machine tool. By predicting the variation of motion error induced by thermal effects on a machine worktable during machining, this model allows deeper insights into the underlying mechanisms that result in evolutions of the spindle accuracy. The heat power
Dongju Chen   +3 more
openaire   +1 more source

Error of measurement of thermal energy

Measurement Techniques, 1998
Analytical expressions are obtained for the error of measurement of thermal energy. It is shown that pairs of temperature transducers and flowmeters must be used to satisfy the “Regulations on the Metering of Thermal Energy and Flows of Heart Carriers”.
A. A. Vakulin, A. V. Shavlov
openaire   +1 more source

Error of measurement of thermal power

Measurement Techniques, 1995
Formulas for calculating the errors of heat output measurement are refined on the basis of the relation between the partial errors of measurement of the mass flow of a heat-transfer agent and its thermal flux. Examples are given for steam and hot water.
I. M. Shenbrot, B. M. Belyaev
openaire   +1 more source

Home - About - Disclaimer - Privacy