Research Concerning the Dynamic Model of the Conventional Sucker Rod Pumping Units

The study of the dynamic model of the conventional sucker rod pumping units requires first determining the variation on the cinematic cycle of the synthesis parameters (the reduced moment and the reduced mass moment of inertia) and then the variation of the angular speed of the cranks, in response to the dynamic and resistant actions on the component elements that appear during operation. The paper presents the way of determining the variation on the cinematic cycle of the synthesis parameters of the dynamic model corresponding to the conventional pumping unit mechanism and of the variation of the angular speed of its cranks. The experimental records have been processed with the Total Well Management program. The simulations have been performed with a computer program developed by the author using the Maple programming environment.

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Research Concerning the Movement Equation of the Mechanism of the Conventional Sucker Rod Pumping Units

Revista de Chimie ◽

10.37358/rc.19.7.7364 ◽

2019 ◽

Vol 70 (7) ◽

pp. 2477-2480

Author(s):

Dorin Badoiu

Keyword(s):

Dynamic Response ◽

Computer Program ◽

Angular Speed ◽

Precise Determination ◽

Management Program ◽

Programming Environment ◽

Synthesis Parameters ◽

Sucker Rod ◽

Pumping Units

Establishing and then solving the movement equation of the mechanism of the conventional sucker rod pumping units allows determining the variation on the cinematic cycle of the angular speed of the cranks as a dynamic response to the motor and resistant actions on the component elements. The evaluation as accurate as possible of the dynamic response depends on a more precise determination of the variation on the cinematic cycle of the synthesis parameters that occur in the movement equation of the mechanism of the pumping units. In the paper is established the movement equation of the mechanism of the conventional pumping units and are presented a series of results regarding the variation on the cinematic cycle of some synthesis parameters in the case of the mechanism of a C-640D-305-120 pumping unit. Experimental records have been processed with the Total Well Management program and the simulations have been performed with a computer program developed by the author using the Maple programming environment.

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Research Concerning the Kinetostatic Analysis of the Mechanism of the Conventional Sucker Rod Pumping Units

Revista de Chimie ◽

10.37358/rc.18.7.6431 ◽

2018 ◽

Vol 69 (7) ◽

pp. 1855-1859

Author(s):

Dorin Badoiu ◽

Georgeta Toma

Keyword(s):

Computer Program ◽

Programming Environment ◽

Sucker Rod ◽

Pumping Units

It is well known that the bearings of the mechanism of the conventional pumping units are heavily loaded so that their design has to be accomplished very carefully. In this scope the values of the connection forces acting on these bearings has to be determined as accurately as possible. In the paper is presented the kinetostatic analysis of the mechanism of the conventional sucker rod pumping units, obtaining in this way the values of the connection forces in the joints and of the motor moment at the cranks shaft. For processing the experimental records it has been used the program Total Well Management. The simulations have been performed with a computer program developed by the authors using Maple programming environment.

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Research Concerning the Use of Polynomial Functions in the Study of the Conventional Sucker Rod Pumping Units

Revista de Chimie ◽

10.37358/rc.19.4.7096 ◽

2019 ◽

Vol 70 (4) ◽

pp. 1223-1227

Author(s):

Dorin Badoiu

Keyword(s):

Computer Program ◽

Polynomial Functions ◽

Programming Environment ◽

Dynamic Parameters ◽

Structural Elements ◽

Functional Optimization ◽

Precise Form ◽

Proper Functioning ◽

Sucker Rod ◽

Pumping Units

The analysis of the conventional sucker rod pumping units and especially their dynamics is laborious and requires a large amount of calculations due to the constructive complexity of the component structural elements. Therefore, expressing in a simplified but sufficiently precise form the various cinematic and dynamic parameters that characterize the proper functioning of the pumping units is extremely useful in analyzing the possibilities of their functional optimization. In the paper are presented a series of results concerning the expressing of some cinematic and dynamic parameters using polynomial functions in the case of the mechanism of a C-640D-305-120 pumping unit. The simulations have been performed with a computer program developed by the author using Maple programming environment. Experimental records processing was performed with the program Total Well Management.

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Research Concerning the Predictive Evaluation of the Motor Moment at the Crankshaft of the Conventional Sucker Rod Pumping Units

Revista de Chimie ◽

10.37358/rc.19.2.6920 ◽

2019 ◽

Vol 70 (2) ◽

pp. 378-381

Author(s):

Dorin Badoiu ◽

Georgeta Toma

Keyword(s):

Computer Program ◽

Predictive Model ◽

Calculation Model ◽

Model Parameters ◽

Programming Environment ◽

Model Errors ◽

Proper Functioning ◽

Sucker Rod ◽

Polished Rod ◽

Pumping Units

It is well known that the variation on the cinematic cycle of the motor moment at the crankshaft of the conventional pumping units characterizes their proper functioning. In the paper it was developed a predictive calculation model of the motor moment at the crankshaft depending on the force at the polished rod. The estimation of the predictive model parameters has been done by minimizing a function that contains the calculus model errors. The experimental records have been processed with the program Total Well Management. The simulations have been performed with a computer program developed by the authors using Maple programming environment.

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Modeling and validation of crankshaft speed fluctuations of a single-cylinder four-stroke diesel engine

Proceedings of the Institution of Mechanical Engineers Part D Journal of Automobile Engineering ◽

10.1177/09544070211026290 ◽

2021 ◽

pp. 095440702110262

Author(s):

Mustafa Babagiray ◽

Hamit Solmaz ◽

Duygu İpci ◽

Fatih Aksoy

Keyword(s):

Diesel Engine ◽

Dynamic Model ◽

Moment Of Inertia ◽

Mass Motion ◽

Cylinder Pressure ◽

Motion Equations ◽

Single Cylinder ◽

Mass Moment ◽

Mass Moment Of Inertia ◽

Speed Fluctuations

In this study, a dynamic model of a single-cylinder four-stroke diesel engine has been created, and the crankshaft speed fluctuations have been simulated and validated. The dynamic model of the engine consists of the motion equations of the piston, conrod, and crankshaft. Conrod motion was modeled by two translational and one angular motion equations, by considering the kinetic energy resulted from the mass moment of inertia and conrod mass. Motion equations involve in-cylinder gas pressure forces, hydrodynamic and dry friction, mass inertia moments of moving parts, starter moment, and external load moment. The In-cylinder pressure profile used in the model was obtained experimentally to increase the accuracy of the model. Pressure profiles were expressed mathematically using the Fourier series. The motion equations were solved by using the Taylor series method. The solution of the mathematical model was performed by coding in the MATLAB interface. Cyclic speed fluctuations obtained from the model were compared with experimental results and found compitable. A validated model was used to analyze the effects of in-cylinder pressure, mass moment of inertia of crankshaft and connecting rod, friction, and piston mass. In experiments for 1500, 1800, 2400, and 2700 rpm engine speeds, crankshaft speed fluctuations were observed as 12.84%, 8.04%, 5.02%, and 4.44%, respectively. In simulations performed for the same speeds, crankshaft speed fluctuations were calculated as 10.45%, 7.56%, 4.49%, and 3.65%. Besides, it was observed that the speed fluctuations decreased as the average crankshaft speed value increased. In the simulation for 157.07, 188.49, 219.91, 251.32, and 282.74 rad/s crankshaft speeds, crankshaft speed fluctuations occurred at rates of 10.45%, 7.56%, 5.84%, 4.49%, and 3.65%, respectively. The effective engine power was achieved as 5.25 kW at an average crankshaft angular speed of 219.91 rad/s. The power of friction loss in the engine was determined as 0.68 kW.

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Comparison of the Rotor Dynamic and Structure Dynamic Calculation of Compressors

Journal of Engineering for Gas Turbines and Power ◽

10.1115/1.2815592 ◽

1997 ◽

Vol 119 (2) ◽

pp. 425-429

Author(s):

M. Hohlrieder ◽

H. Irretier

Keyword(s):

Dynamic Model ◽

Elastic System ◽

Elastic Model ◽

Cyclic Symmetry ◽

The Finite Element Method ◽

Dynamic Calculation ◽

Mass Moment ◽

Mass Moment Of Inertia ◽

Gyroscopic Effects ◽

Rotor Dynamic

The paper presents the analysis of a compressor employing the method of cyclic symmetry incorporating gyroscopic effects and geometric nonlinearities of the whole elastic system based on the finite element method. Because of numerical difficulties, the solution of the resulting eigenvalue problem is limited to a small number of DOF’s. For this reason the calculation of the impeller as an elastic model is performed including the prestress and nonlinearities due to rotation. With the knowledge of these frequencies and the mass moment of inertia of the impeller, an equivalent system of rigid disk and speed dependent spring is included in the rotor dynamic model. Further, the gyroscopic effect, speed-dependent bearing coefficients, and the elastic effects due to the rotation of the impeller are included in the rotor dynamic model. For illustration purpose, calculation is performed on a fan rotor and the results are compared with those obtained from experiment.

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Research Concerning the Correlations Between Some Experimental Results in the Case of a Sucker Rod Pumping Installation

Revista de Chimie ◽

10.37358/rc.18.11.6682 ◽

2018 ◽

Vol 69 (11) ◽

pp. 3060-3063

Author(s):

Dorin Badoiu ◽

Georgeta Toma

Keyword(s):

Computer Program ◽

Rotation Speed ◽

Experimental Results ◽

Programming Environment ◽

Sucker Rod ◽

Pumping Unit ◽

Polished Rod

In the paper are analyzed the correlations between the experimental results obtained for the instantaneous rotation speed of the cranks shaft of a conventional sucker rod pumping installation and the speed and the acceleration at the end of the polished rod. The correlations have been established by analyzing the kinematics of the mechanism of the sucker rod pumping unit. The experimental records have been processed with the program Total Well Management. A computer program for performing the simulations has been developed by the authors using Maple programming environment.

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RESEARCH CONCERNING THE SIMULATION OF THE OPERATION OF CONVENTIONAL SUCKER ROD PUMPING UNITS

Romanian Journal of Petroleum & Gas Technology ◽

10.51865/jpgt.2021.02.04 ◽

2021 ◽

Vol 2(73) (2) ◽

pp. 33-39

Author(s):

Georgeta Toma ◽

Keyword(s):

Computer Program ◽

Calculation Method ◽

Operating Parameters ◽

Motor Torque ◽

Sucker Rod ◽

Pumping Unit ◽

Pumping Units

In the paper is presented a method for obtaining the variation during a cinematic cycle of the motor torque at the crankshaft in the case of the conventional sucker rod pumping units. The calculation method has been transposed into a computer program which allows establishing the influence of different constructive and operating parameters of the pumping units on the variation of the motor torque at the crankshaft. Finally, a series of results of the simulations performed in the case of a C-640D-305-120 pumping unit are presented.

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