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J. Comput. Sci. Eng. Vol.
17 (2015)
569-601 |
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Influence of
Relative Position between Vane and Volute Tongue on
Hydraulic Performance of a Two-phase Flow Pump |
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Yingyu
Ji, Fengrong Hu and
Yuliang Zhang |
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J. Comput. Sci. Eng.
17 (2015) 569-575
！Published
March 25, 2015 |
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Abstract:
To study the effect of the relative position between
vane and volute tongue on external performance and
interior flow field of a solid-liquid two-phase flow
centrifugal pump, 3D numerical calculations of
solid-liquid pump delivering two-phase flow are
performed by using moving reference frame, RNG k-ε
turbulence model, and mixture model. The pulsation
character of external performance and variety character
of interior flow field are achieved. Results show that
some typical external parameters appear as periodic
pulsation phenomena in the process of rotation, such as
head, axis power, axial thrust, and radial force.
Pulsation frequency is in proportion with rotation speed
and vane numbers, and it actually embodies the unsteady
flow characteristic of the pump. The volute tongue
structure is the essential reason for the asymmetric
flow field and the periodic pulsation in the pump. |
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Keywords:
Two-phase flow pump; Relative position; Numerical
calculation; Pulsation characteristics.
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Research of
Aerodynamic Performance based on Wind Turbine Vibration
Performance
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Fanqi
Tan and Yunjie Zeng |
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J. Comput. Sci. Eng. 17 (2015) 575-579
！Published
March 25, 2015
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Abstract:
Wind turbines is one of the most important components of
the wind turbine, design for wind turbines with good
wind turbines is the basis of high wind energy
utilization coefficient and large economic benefits.
Using the theory of Wilson pneumatic designed 100 W
horizontal axis wind turbine, in the process of design
and design parameters on the vibration performance
correction. Finally on rotor vibration modal experiment
and pneumatic external characteristic experiment, the
experimental results show that the design of the wind
turbine at low wind speed can meet the design of the
wind energy utilization coefficient, and the wind
machine to avoid the resonance region speed at run time,
extend the life of the rotor, so as to reduce the design
cost. |
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Keywords:
Wind turbine; Design; The aerodynamic performance; Vibration
performance.
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The
Application of Kalman Filter in Boiler Temperature
Monitoring System |
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Lili Bai, Daojun Wang, Wenfeng Sun and Li Yang
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J. Comput. Sci. Eng. 17 (2015) 580-583
！Published
March 25, 2015
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Abstract:
The application of Kalman filter in current digital
boiler temperature control system is studied in this
paper. The Kalman filter algorithm is introduced in
the temperature control part and the mathematical
model is established, then the corresponding filter
equation is given based on the system
characteristics. The real-time tracking problem of
the steam boiler temperature monitoring is solved by
using Kalman filter algorithm. Finally that the
sampling signal filtering effect is better can be
verified through mat lab simulation.
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Keywords:
Kalman filter; Boiler temperature; Monitoring system.
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Analysis and
Research of Instrument Timbre base on the Digital Virtual
Instrument Model Constructed by the Computer Music Notation
Software
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Yutong
Liu
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J. Comput. Sci. Eng. 17 (2015) 584-587
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March 25, 2015
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Abstract:
Timbre is a very important expression means in music,
which is an auditory attributes to determine the
difference between the two steady tones with the same
loudness and pitch. When computer technology combined
with music and produced computer music, it is
undoubtedly very important that research of instrument
timbre base on the Digital virtual instrument model
constructed by the computer music notation software. In
order to describe computer musical instrument timbre,
build software instrument and to change the computer
instrument timbre by adjusting the parameters, this
paper set up a digital virtual instrument timbre model
constructed by the computer music notation software,
analysis the influence of parameter values to timbre in
this model, so as to provide more space for the choice
of timbre. |
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Keywords:
Computer software; Digital virtual instrument model;
Instrument timbre.
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The Research
of Continuous Sand Washing on Well Dislocation Sand Spit
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Yulian Chang, Liwei Zhang, Lihua Fan and Wei Luo
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J. Comput. Sci. Eng. 17 (2015) 588-592
！Published
March 25, 2015
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Abstract:
In the process of workover, some dislocation wells prone
sand and rock spitting phenomenon which resulting in no
advancing in sand washing, stuck tubing string, the
channel cannot be opened up, the fracture cannot be
sealed and other problems that holds the repairing
success rate low. This phenomenon has huge impact on the
district block injection and production adjustment.
Predicting the sand spitting state for dislocation well
in advance, taking appropriate measures to continuously
flush the settling sand and the spit rock at the bottom
of the well to the ground, are the keys to restoration
of governance of dislocation well. In this paper, by
numerical simulation, the form of sand and rock spitting
of the dislocation wells are analyzed by numerical
simulation, measures which could effectively repair the
wells are proposed. |
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Keywords:
Dislocation; Sand spit; Rock spit; Numerical simulation;
Continuous sand washing.
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Predictive
control method study for intelligent vehicle based on
the data driven control
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Li
Yang, Lili Bai and Huizhen Zhang
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J. Comput. Sci. Eng. 17 (2015) 593-596
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March 28, 2015
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Abstract:
During the control process of intelligent vehicle,
various factors like change in load and vehicle abrasion
will make it difficult to accurately establish vehicle
steering system and driving system model. Based on data
driven control algorithm, the paper made direct use of
measured speed as well as steering engine angle,
directly identified controller parameter, avoided model
identification process, and directly designed controller
based on a certain optimized performance index to
improve controlling accuracy. Simulation results showed
that the method featured outstanding controlling
performance. |
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Keywords:
Data driven; Intelligent vehicle; System identification;
Predictive control.
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Mechanical
Model and Analysis of Casing Dislocation Form on
Oil-Water Well
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Liwei Zhang, Yulian Chang, Tao Wu and Xiaobo Yan
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J. Comput. Sci. Eng. 17 (2015) 597-601
！Published
March 28, 2015
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Abstract:
As the service life of the oil-water wells are
prolonged, because of the effects of engineering,
geology and other factors, the production casings are
inevitable to be deformed, damaged even severely
dislocated. If these wells do not get reasonable
treatments in time, not only it would influence their
own normal production, but also affect the production of
the whole of area. Nowadays there is no effective means
of detection for the form of the casing dislocation. We
can¨t accurately determine the down holes condition when
the casing is dislocated. So it is difficult to repair
the dislocated casing wells. By establishing mechanical
model of casing dislocation form, based on the geologic
conditions and statistics of casing damage in the
region, according to the conditions of each well such as
the parameters of formation, injection-production
relationship, the lateral loads of the casing etc, then
we use some relative formulae with corresponding
parameters to calculate and analyze to predict exactly
the situations of casing damage wells including the type
of casing damage, the axial and radial displacement of
the dislocated casing etc. This method is significant
and effective for enhancing the rate of repairing the
damage wells and ensuring stable production of the key
blocks in Oil field. |
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Keywords:
Casing damage; Casing dislocation; Form Recognition;
Stress load; Mechanical model.
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