Innovation activity of the Novosibirsk State Technical University

Vostrikov, A. S.; Денисов, В И; Kulikov, Y.A.

doi:10.1109/korus.2000.865987

Cited by 2 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…First, we used analytical dependencies to find the controller coefficients. This part of the method is based on analytical synthesis in frequency domain [34][35][36].…”

Section: Reconfiguring the Rac Controllermentioning

confidence: 99%

Advancement of Roll-Gap Control to Curb the Camber in Heavy-Plate Rolling Mills

et al. 2021

View full text Add to dashboard Cite

The quality of steelwork products depends on the geometric precision of flat products. Heavy-plate rolling mills produce plates for large-diameter pipes and for use in shipbuilding, mechanical engineering, and construction. This is why the precision requirements are so stringent. Today’s Mills 5000 produce flat products of up to 5 m in width; the operation of these units shows ‘camber’ defects and axial shift of the roll at the stand exit point. This induces greater loss of metal due to edge trimming and involves a higher risk of accidents. These defects mainly occur due to the asymmetry in the roll gap, which is in turn caused by their misalignment in rolling. As a result, the feed varies in gauge, and the strip moves unevenly. The paper’s key contribution consists in theoretical and experimental substantiation and development of a set of control methods intended to address roll-gap asymmetry. The methods effectively compensate for the asymmetry resulting from the “inherited” wedge, which preexists before the strip enters the stand. They also compensate for the “ongoing” roll misalignment that is caused by the difference in force on the opposite side of the stand during rolling. This comprehensive approach to addressing camber and axial displacement of the feed has not been found in other sources. This paper presents a RAC controller connection diagram that ensures that the roll gap is even across the feed. The paper notes the shortcomings of the design configuration of the controller and shows how it could be improved. The authors have developed a predictive roll-gap asymmetry adjustment method that compensates for the deviations in gauge during the inter-passage pauses. They have also developed a method to control gap misalignment during rolling. The paper showcases the feasibility of a proportional-derivative RAC. The methods have been tested by mathematical modeling and experimentally. The paper further shows oscillograms sampled at Mill 5000 after implementing the developed solutions. Tests confirm far better precision of the screw-down mechanisms on the opposite sides of the stand. This reduces the variation in gauge across the feed and thus curbs the camber defect. As a result, the geometry of the flat improves, and less metal is lost in trimming. The paper further discusses how the RAC controller interacts with the automatic gauge control system. The conclusion is that these systems do not interfere with each other. The developed systems have proceeded to pilot testing.

show abstract

“…First, we used analytical dependencies to find the controller coefficients. This part of the method is based on analytical synthesis in frequency domain [34][35][36].…”

Section: Reconfiguring the Rac Controllermentioning

confidence: 99%

Advancement of Roll-Gap Control to Curb the Camber in Heavy-Plate Rolling Mills

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Recently, it was pointed out by Pestrikov [30], that for ion velocities smaller or comparable to the longitudinal velocity spread of the electrons, the integral in Eq. (4) does not go to zero even without the nonlogarithmic term when the transverse velocity of an ion is zero and results in the finite value for the longitudinal component of the force.…”

Section: B Origin Of Finite Longitudinal Force At Zero Transverse Anmentioning

confidence: 99%

Numerical study of the magnetized friction force

Fedotov

Bruhwiler

Sidorin

et al. 2006

Phys. Rev. ST Accel. Beams

View full text Add to dashboard Cite

Fundamental advances in experimental nuclear physics will require ion beams with orders of magnitude luminosity increase and temperature reduction. One of the most promising particle accelerator techniques for achieving these goals is electron cooling, where the ion beam repeatedly transfers thermal energy to a copropagating electron beam. The dynamical friction force on a fully ionized gold ion moving through magnetized and unmagnetized electron distributions has been simulated, using molecular dynamics techniques that resolve close binary collisions. We present a comprehensive examination of theoretical models in use by the electron cooling community. Differences in these models are clarified, enabling the accurate design of future electron cooling systems for relativistic ion accelerators.

show abstract

Innovation activity of the Novosibirsk State Technical University

Cited by 2 publications

References 0 publications

Advancement of Roll-Gap Control to Curb the Camber in Heavy-Plate Rolling Mills

Advancement of Roll-Gap Control to Curb the Camber in Heavy-Plate Rolling Mills

Numerical study of the magnetized friction force

Contact Info

Product

Resources

About