Results 221 to 230 of about 16,323 (262)

Evaluation of Subcooled Water Thrust Forces

Nuclear Technology, 1976
Subcooled water thrust forces for use in pipe rupture analyses have been normalized with respect to an enthalpy normalization factor. This normalization is based on comparisons with thrust forces calculated using the Henry-Fauske model, and the answers are within +-3 percent in the range 300 to 2400 psia (21.1 to 168.7 kg/cm/sup 2/).
openaire   +1 more source

Intelligent Modeling of Thrust Force in Drilling Process

Journal of Dynamic Systems, Measurement, and Control, 2006
In this paper, an intelligent modeling strategy for thrust force in drilling process is proposed. First of all, neural network (NN) models are developed to model the thrust force in drilling process. Second, drill head position information is included in the NN model to get better force prediction accuracy for entrance and exit drilling stages.
Ye Sheng, Masayoshi Tomizuka
openaire   +1 more source

The Thrust Force Structure in Drilling

2009
The purpose of this work is to present investigation of the thrust force generated during drilling process. The thrust force acting on drill is the sum of three components: the cutting component, the thrust force attributed to ploughing at the chisel edge and the thrust force resulting from friction at the margin.
Sekulić, Milenko, Kovač, Pavel, Gostimirović, Marin, Jurković, Zoran, Savković, Borislav   +4 more
openaire   +2 more sources

THRUST FORCE OF TFLM AS A DIRECTION OF FRICTIONAL RESISTANCE

International Journal of Modern Physics B, 2006
This paper presents an integrated linear actuator combined with a Traverse Flux Linear Motor (TFLM) for household electric applications. They both use the same primary magnetic circuit, but they have different secondary movers. The paper presents a new design of linear motor for a new electromagnetic linear actuator, an integrated TFLM. The calculated
BYUNG-CHUL WOO, DO-KWAN HONG, DO-HYUN KANG   +2 more
openaire   +1 more source

Thrust force analysis of spindle motor for HDDs

International Symposium on Power Electronics, Electrical Drives, Automation and Motion, 2006. SPEEDAM 2006., 2006
This paper presents spindle motor with fluid dynamic bearing (FDB) for hard disk drives. Thrust bearing of FDB requires appropriate pressure to operate in smooth rotations. In this study, the thrust force between rotor and thrust yoke is analyzed using 3D finite element method and experimental results are compared with the simulated ...
null Jung-Moo Seo, null In-Soung Jung, null Ha-Gyung Sung   +2 more
openaire   +1 more source

Optimum thrust trajectories in general central force fields

Astrodynamics Conferece, 1978
The well known "primer theory" of Lawden is used for the analysis of optimal coplanar orbital transfers in general central force fields. Two first-integrals, which hold for singular thrusting arcs as well as impulsive thrusts, are shown to become linearly dependent if a circular coasting arc forms part of an optimal trajectory.
openaire   +1 more source

Evaluation of Thrust Force and Cutting Torque in Reaming

1996
Reaming is a process that is widely used in industry with very little theoretical modelling being carried out. In this paper the cutting action of the reaming operation is presented by explaining the thrust and torque involved. A model based on an orthogonal theory of machining and variable flow stress is presented in order to predict the thrust and ...
R. Narimani, P. Mathew
openaire   +1 more source

Thrust force requirements for TBMs in squeezing ground

Tunnelling and Underground Space Technology, 2010
Rapidly converging ground may exert such a high pressure on the shield that the thrust force is no longer sufficient to overcome shield skin friction and the TBM becomes jammed. This paper advances a number of theory-based decision aids, which will support rapid, initial assessments to be made of thrust force requirements.
M. Ramoni, G. Anagnostou
openaire   +1 more source

Increased Jet Thrust from Pressure Forces

Journal of the Aeronautical Sciences, 1950
For ram-jets and turbojets, which operate with low overall jet expansion ratios, it is possible to obtain more thrust with incomplete expansion in the jet nozzle utilizing both pressure and momentum forces than with complete expansion utilizing momentum forces alone.
openaire   +1 more source

Analytical modeling of thrust force and torque in drilling

Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, 2013
The prediction of thrust force and torque in drilling remains a key issue. There are three main ways to determine these forces based on experimental, numerical and finally analytical approaches. The major drawback with numerical and analytical methods concerns their reliability compared to phenomenological models.
Naisson, Pierre, Rech, Joël, Paris, Henri   +2 more
openaire   +1 more source