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Impact of Model Detail of Synchronous Machines on Real ...

In this paper, it is investigated how detailed the model of a synchronous machine needs to be in order to assess transient stability using a Single Machine Equivalent (SIME). The results will show how the stability mechanism and the stability assessment are affected by the model detail. In order to identify the transient stability

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EP1987329B1 - Headbox and stock delivery system for a ...

A headbox including a stock dilution profiling arrangement and associated stock delivery systems are provided, which together deliver to the forming section of a papermaking machine a uniform stock flow with more consistent basis weight and fiber orientation profiles than has previously been possible. These improvements in basis weight uniformity and fiber orientation profile provide benefits ...

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Stora Enso Paper Mill Improves Product Quality and Process ...

Stora Enso is an integrated paper, packaging and forest products company with an annual production capacity of 13.2 (in 2005) million tonnes of paper and 46,000 employees worldwide. At Stora Enso's paper mill in Varkaus, paper machine 3 produces 60-90 gram fine paper.

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TRANSIENT STABILITY ANALYSIS OF POWER SYSTEM USING ...

In this paper, a new approach to incorporate the field flux decay into transient stability analysis of single machine- infinite bus power system is presented. The change in the voltage behind the transient reactance of a synchronous machine during the fault-on or post-fault can be directly computed from the time solution model, which has been ...

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Paper Machine Transition Troubleshooting from Stock ...

Paper Machine Transition Troubleshooting from Stock Blending to the Reel ... the headbox jet to wire ratio during the large speed increase. Control Systems 2012 Page 566. Weight(Dry) ... issues with first pass retention and overall sheet stability because of the short mixing time or interaction

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SINGLE MACHINE INFINITE BUS POWER SYSTEM TRANSIENT ...

This paper presents an interactive software implementation of the single machine, infinite bus power system. All the methods of analysis for the power system transient stability have been integrated in the software. The software is specifically useful for power engineers to comprehend the transient stability .

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TRANSIENT STABILITY ANALYSIS OF POWER SYSTEM USING ...

In this paper, a new approach to incorporate the field flux decay into transient stability analysis of single machine- infinite bus power system is presented. The change in the voltage behind the transient reactance of a synchronous machine during the fault-on or post-fault can be directly computed from the time solution model, which has been ...

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Microbes in the Papermachine Environment

C Paper Machines 122 o F50 o C Starch Vats 140 o F60 o C Thermophiles 158oF70oC Board machines 176 o F80 o C o o HtS i PaperCon 2011 Page 2316. ... Machine surfaces • Headbox ... •Deposit analysis-Microbiological analysis of deposits

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Standard approach to perform power system stability ...

Transient Stability and Governor and Load Frequency Control which are in the range of milliseconds to a few seconds. Fig. 4 Time frame Rotor-angle stability (or angle stability) being focused on in this paper is concerned with the ability of interconnected synchronous machines of a power system to remain in

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Case Study for Performance Assessment and Benefit ...

system consists of the headbox, wire and circulated white-water which is a filtrate from the wire. The white water dilutes the stock to desired consistency (0.3-1%) for the paper web forming process. The headbox spreads the stock on wire across the width of paper machine and the paper .

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Initial wet web strength of paper | SpringerLink

May 17, 2016· Despite much research into and development within the complex area of the initial wet web strength of paper, no complete model has yet been developed to describe this property. This type of paper strength is the most important property to ensure an effective paper machine run. Furthermore, the process of strength development in the sheet forming and pressing portion of the process is the .

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NPTEL :: Electrical Engineering - Power System Stability ...

Analysis of Power System Stability by Classical Methods; Module 3. Modelling of a Synchronous Machine; Module 4. Modelling of Exciter, Turbine and System Load; Module 5. Representation of Synchronous Machine for Stability Studies; Module 6. Small-Signal Stability Analysis; Module 7. Transient Stability Analysis; Module 8. Voltage Stability

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Chapter 6: Analysis of Structures

6.12 Machines Machines are structures designed to transmit and modify forces. Their main purpose is to transform input forces into output forces. • Machines are usually non -rigid internally. So we use the components of the machine as a free -body. • • Given the magnitude of P, determine the magnitude of Q. Exercise 6.143 Wednesday ...

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1 Preemptive Control of Moisture Content in Paper ...

paper. Considering that a typical modern paper machine is 6 m wide and runs in excess of 2000 m/min, a tremendous amount of water has to be removed. Pulp slurry is injected through the headbox onto a traveling porous fabric (called the "wire") which transports the paper being manufactured along the paper machine. The moisture content

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CONTROL SYSTEM ENGINEERING-II (3-1-0)

response of Sampled-data closed loop Control Systems, The Z and S domain Relationship, Stability Analysis. MODULE-III (10 HOURS) Nonlinear Systems: Introduction, Common Physical Non-linearities, The Phase-plane Method: Basic Concepts, Singular Points, Stability of Nonlinear System, Construction of Phase-trajectories, The

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headbox_tappi2000c | Fluid Dynamics | Turbulence | Prueba ...

INTRODUCTION In a hydraulic headbox, stock is admitted in a tapered manifold and flows across the width of the machine with a portion of the stock being recirculated to prevent a pressure build-up at the manifold exit. An array of small diffuser tubes connects the manifold to the slice, which produces a free jet that impinges on the forming section.

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Table of Contents

3. Carry out stability analysis of finite and infinite slopes with some field problem. 4. Compute safe bearing capacity of shallow foundations. 5. Design pile and pile group. 6. Carry out settlement analysis of footings. 7. Assess the potential of soil for the design of landfills and reinforced earth wall. Model Question Paper Total Duration (H ...

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FIBER ORIENTATION IN A HEADBOX by Xun Zhang B. Eng ...

headbox has a significant effect on the orientation of fibers leaving the slice. The elongation and shear in the flow leading to the slice tend to orient fibers in the machine direction. If the fiber orientation can be predicted for a given set of processing conditions, manufacturing paper with optimum mechanical properties will become much easier.

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[2012.13253] Soft-IntroVAE: Analyzing and Improving the ...

Dec 24, 2020· The recently introduced introspective variational autoencoder (IntroVAE) exhibits outstanding image generations, and allows for amortized inference using an image encoder. The main idea in IntroVAE is to train a VAE adversarially, using the VAE encoder to discriminate between generated and real data samples. However, the original IntroVAE loss function relied on a particular .

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Using dynamic simulation and operability analysis for an ...

Using dynamic simulation and operability analysis for an improved broke management in a fine paper mill Dante Via, M.Sc. (P2004) Introduction Process variability in a highly integrated paper mill is a very complex problem and depends on at least five sources: mechanical, chemical, furnish quality, process design and control structure.

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Simulation of Synchronous Machine in Stability Study for ...

Abstract—This paper presents a linear mathematical model of the synchronous generator with excitation system for power system stability. For large systems the state space model has been used more frequently in connection with system described by linear differential equations. The flux linkage of each circuit in the machine depends

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Structural stability - Northwestern University

Stability analysis in solid mechanics began with Euler's solution of buckling of an elastic column (Euler, 1744). Most basic linear elastic problems of structural stability were solved by the end of the 19th century, although further solutions have been appearing as new structural types were being introduced.

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CORE

Primarily, streaks in the paper sheet are believedto be the result of streamwise streaks in the headbox jet.The thesis is aimed at the flow phenomena which occur in the headbox jet. Theinvestigations have been made with numerical calculations, stability theory and modelexperiments using water, as well as experiments with a real paper machine ...

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FOUNDATIONS FOR INDUSTRIAL MACHINES AND .

also presented. The paper also touches upon the effects of earthquakes on machines as well as on their foundations. Use of commercially available finite element packages, for analysis and design of the foundation, is strongly recommended, but with caution. KEYWORDS: Machine Foundation, Dynamic Response, Seismic Qualification, Design Aids,

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headbox_tappi2000c | Fluid Dynamics | Turbulence | Prueba ...

INTRODUCTION In a hydraulic headbox, stock is admitted in a tapered manifold and flows across the width of the machine with a portion of the stock being recirculated to prevent a pressure build-up at the manifold exit. An array of small diffuser tubes connects the manifold to the slice, which produces a free jet that impinges on the forming section.

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Hydrodynamic stability and turbulence in fibre suspension .

The linear stability analysis was found to under predict the ... In a paper machine, large turbulent scales are generated by inserting vanes into the headbox, which together with the accelerated flow are used to break up the fibre flocs. However, it has been suggested, e.g. by Karema et al. (1999), ...

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Impact of Model Detail of Synchronous Machines on Real ...

In this paper, it is investigated how detailed the model of a synchronous machine needs to be in order to assess transient stability using a Single Machine Equivalent (SIME). The results will show how the stability mechanism and the stability assessment are affected by the model detail. In order to identify the transient stability

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Intelligent estimation of web break sensitivity in paper ...

years ago. One of the main reasons for this growth is the increase in paper machine speed and the fact that the speed objective of a new paper machine has doubled in the same period. (Tissari 1995.) From the technological point of view, the most constraining factors in increasing machine speed are wet end runnability and stability.

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Improvement of the retention-formation relationship using ...

Turbulence is generated within the headbox nozzle passage to ensure a uniform dispersion of the ... the stability of the flocs is reduced and hence a favourable fibre dispersion is achieved. ... Valuation of the retention/formation (R/F) relationship using a laboratory pilot-paper machine Svedberg, A. (2007)

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THE IMPORTANCE OF THE MEASUREMENT OF PAPER .

Keywords: Dimensional stability, hygroexpansibility, paper image analysis, reprographic paper, shrinkage ABSTRACT During the drying stage of the papermaking process, paper undergoes dimensional changes caused by fiber dehydration, but exhibiting uneven width reduction magnitudes along the cross-machine direction. The

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Hydrodynamics of plane liquid jets aimed at applications ...

These waves seem to initiate a break-up ofthe jet, which leads to strong streamwise streaks inside the jet.By flow visualisation of headbox flow of an experimental paper machine, togetherwith analysis of the resulting paper structure using the wavelet method the correspondencebetween flow disturbances and paper quality was investigated.

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