Experimental and theoretical investigation on synchronization of a vibration system flexibly driven by two motors

2020 ◽  
Vol 234 (13) ◽  
pp. 2550-2562
Author(s):  
Yujia Li ◽  
Tao Ren ◽  
Xiaoping Meng ◽  
Minghong Zhang ◽  
Peng Zhao
Keyword(s):  
Theoretical Investigation ◽  
Lagrange Equation ◽  
High Viscosity ◽  
Exciting Force ◽  
Drilling Fluids ◽  
Vibration System ◽  
New Materials ◽  
Additional Control ◽  
Special Case ◽  
Synchronization Theory

With the increasing requirements for screening new materials, such as high-density and high-viscosity drilling fluids, it is necessary to increase the exciting force of the shale shaker to fully handle the new materials. To increase the exciting force of shale shaker while improving the force condition, a dynamic model of a vibration system flexibly driven by two motors is proposed in this paper. The dynamic behavior and synchronization theory of this system are investigated by using Lagrange equation and Hamilton’s principle. The calculation proves that the conventional planar vibration system rigidly driven by two motors is a special case of the investigated spatial vibration system flexibly driven by two motors. The phase difference between the eccentric rotors is automatically adjusted by the system to balance the change in the motor installation position for maintaining synchronization and stability. Theoretical investigation and experimental verification prove that the system can synchronize vibration without additional control synchronization.

scholarly journals Synchronization of Two Eccentric Rotors Driven by One Motor with Two Flexible Couplings in a Spatial Vibration System

2019 ◽  
Vol 2019 ◽  
pp. 1-13 ◽  
Author(s):  
Yujia Li ◽  
Tao Ren ◽  
Jinnan Zhang ◽  
Minghong Zhang
Keyword(s):  
High Performance ◽  
Lagrange Equation ◽  
Torsional Stiffness ◽  
Vibration System ◽  
Analysis Method ◽  
Synchronous Motion ◽  
Spatial Vibration ◽  
Resistance Moment ◽  
System Synchronization ◽  
Synchronization Theory

A dynamic model of a vibration system, in which eccentric rotors are driven by one motor with two flexible couplings, is developed in this study. The Lagrange equation is used to analyze the dynamic behavior of the vibration system. Synchronization theory and its motion law are investigated using Hamilton’s principle, and the validity of the theory is proven through numerical simulation and experimentation. Results show that the system has two synchronous motions, namely, 0 and π phases. When the torsional stiffness difference between two flexible couplings on both sides of the motor or the resistance moment difference between two eccentric rotors increases, the eccentric rotors maintain the synchronization and stability of the vibration system by adjusting its phase difference. Synchronization theory and the analysis method of the flexible-drive vibration system are extended in this study. Moreover, the synchronous motion law of the vibration system based on bilateral flexible drive by one motor is revealed to provide guidance for the development of high-performance vibrating machines.

scholarly journals Low-molecular-weight, fatty-acid esters as potential low-temperature drilling fluids for ice coring

2014 ◽  
Vol 55 (68) ◽  
pp. 39-43 ◽  
Author(s):  
Huiwen Xu ◽  
Lili Han ◽  
Pinlu Cao ◽  
Mingyi Guo ◽  
Junjie Han ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Fatty Acid ◽  
Butyl Acetate ◽  
Drilling Fluid ◽  
High Viscosity ◽  
Fatty Acid Esters ◽  
Low Molecular Weight ◽  
Drilling Fluids ◽  
Cold Environments ◽  
Acid Esters

AbstractA challenge for future deep-ice coring in central Antarctica is to identify an appropriate inert drilling fluid with no undesirable physical or chemical characteristics. The drilling fluids currently in use (kerosene-based fluids with density-increasing additives, ethanol and n-butyl acetate) are not intelligent choices for the future from safety, environmental and some technological standpoints. Recently proposed drilling fluids based upon ESTISOL™ have high viscosity at low temperatures, which severely limits their application in cold environments. This paper presents our research into the application of low-molecular-weight, fatty-acid esters (FAEs), substances commonly used in the fragrance and flavoring industries. According to available data, selected FAEs are not hazardous to human health. Considering density requirements alone, ethyl butyrate and n-propyl propionate best meet our present needs. The viscosities of these two chemicals are also the lowest among studied FAEs, not exceeding 4 mPas at temperatures down to −60°C. Both compounds are highly volatile, and insoluble in water. Such properties are attractive, but the applicability of FAEs to deep, cold, ice drilling can be evaluated only after field-based, practical experiments in test boreholes.

Theoretical Analysis on Underwater Vibrating Compaction Technology of Scattering-Filling Rubble Stone Layer

2014 ◽  
Vol 580-583 ◽  
pp. 760-766
Author(s):  
Jian Bao Fu ◽  
Shu Wang Yan ◽  
Zhi Jun Chen
Keyword(s):  
Theoretical Analysis ◽  
Field Application ◽  
Exciting Force ◽  
System Quality ◽  
Vibration System ◽  
Equivalent Stiffness ◽  
Equivalent Damping ◽  
Hydraulic Hammer ◽  
Short Time ◽  
Mathematical Derivation

This paper studied on the underwater vibrating compaction technology of scattering-filling rubble stone layer. At HongKong-Zhuhai-Macao bridge project, in order to satisfy the project time limit, underwater vibrating compaction technology with hydraulic hammer instead of conventional dynamic compaction technology was used to tamp scattering-filling rubble stone layer with no dead angle in a short time. Owing to the shortage of engineering example, the theoretical analysis was needed before field application. In this paper, the rubble stone layer and the vibration system were simplified to a mechanical model. Vibration system’s work on rubble stone was obtained by mathematical derivation, and effects of parameters were analyzed. The result shows that work on scattering-filling rubble stone layer increases with the increase of system quality, equivalent damping, exciting force and angular velocity and decreases with the increase of equivalent stiffness, water stiffness and buoyancy.

Numerical Solution of Multiphysics Large Deflection Plates for Ionic Polymeric Artificial Muscle Applications

2003 ◽  
Author(s):  
J. G. Michopoulos
Keyword(s):  
Large Deflection ◽  
Artificial Muscle ◽  
Adaptive Finite Element ◽  
New Materials ◽  
Active Materials ◽  
Finite Element Approach ◽  
Various Boundary Conditions ◽  
State Evolution ◽  
Element Approach ◽  
Special Case

Recent advances in the manufacturing of new materials that can by activated by multifield excitation have introduced the need for modeling their multiphysics behavior. In responding to this need the special case of electric multihygrothermoelasticity is being considered as the closest multiphysics theory for modeling the behavior electro-hygrothermo-elasto-active materials utilized in artificial muscle applications. Furthermore, the system of governing partial differential equations describing the state evolution of large deflection plates made from such materials is derived as a twodimensional specialization of the above mentioned theory. These electro-hygro-thermally modified Von-Karman nonlinear equations are solved numerically through an adaptive finite element approach and preliminary results are presented for the case of a rectangular ionic polymeric material plate under various boundary conditions. Finally, various issues associated with the regimes of applicability of this theory and approach are also presented.

Combined control strategy for synchronization control in multi-motor-pendulum vibration system

2021 ◽  
pp. 107754632110079
Author(s):  
Pan Fang ◽  
Yuanguo Wang ◽  
Min Zou ◽  
Zhiliang Zhang
Keyword(s):  
Control Strategy ◽  
Sliding Mode ◽  
Lagrange Equation ◽  
Phase Error ◽  
Vibration System ◽  
Parameter Restriction ◽  
Combined Control ◽  
Screening Efficiency ◽  
Coupling Error ◽  
Better Than

Multi-motor-pendulum vibration systems have been applied to design shale shakers in petroleum drilling engineering. However, synchronization of the multi-motor-pendulum vibration system is instable on account of external load disturbance and systematic parameter restriction, which is a principal factor to decrease screening efficiency of shale shakers. In this work, to maintain stability synchronization of three eccentric rotors driven by three induction motors, a combined synchronous control strategy by tracking velocity and phase among the motors is proposed. First, the dynamic model of the system is deduced based on the Lagrange equation. Second, adjacent cross-coupled control combined with master–slave control is designed to control speed and synchronization between the motors in the multi-motor-pendulum vibration system. Third, to ensure the precision and robustness of the control system, the velocity error, phase error, and coupling error controllers are designed with reaching law algorithm and global sliding mode control; and stability of the controller system is validated by the Lyapunov theorem. Finally, the effectiveness of the control strategy is verified by numerical simulation and compared with previous findings. The results indicate that synchronous state and velocity overshoot of the motors can be controlled with the combined control strategy; and robustness of the control strategy is better than other methods.

A New Approach to Evaluate Temperature Effects on Rheological Behavior of Formate-Based Fluids

2002 ◽  
Vol 124 (3) ◽  
pp. 141-145 ◽  
Author(s):  
Rosana F. T. Lomba ◽  
Carlos H. M. de Sa´ ◽  
Edimir M. Branda˜o
Keyword(s):  
Rheological Behavior ◽  
Good Alternative ◽  
Extensive Study ◽  
Organic Salt ◽  
Drilling Fluids ◽  
Shear Stresses ◽  
New Approach ◽  
Completion Fluids ◽  
Best Fit ◽  
Special Case

Organic salt brines represent a good alternative to drill through deep productive zones. The literature presents these salts as thermal stabilizers of polymers used in the formulation of drill-in fluids. An extensive study was carried out to evaluate the rheological behavior of formate-based fluids as a function of temperature and density. An analytical expression was developed to correlate shear stresses with temperature for general drilling fluids and a special case of this expression results in a greatly simplified expression that is valid for a number of drilling and completion fluids produced using different alkali-metal salts of formic acid. The advantage of this new approach is the lack of dependence between the proposed correlation and the choice of a rheological model. Unlike many expressions presented in the literature, the expression proposed and methodology that follows allows the choice of a best-fit model to predict the fluid’s rheological behavior as a function of temperature. Experimental results show that formates do improve the thermal stability of polymers. The proposed correlations will soon be incorporated in a wellbore cleaning numerical simulator to compensate for thermal effects.

scholarly journals Numerical simulation of formation damage by drilling fluid in low permeability sandstone reservoirs

2021 ◽  
Vol 11 (4) ◽  
pp. 1865-1871
Author(s):  
Weiwei He ◽  
Zhiqiang Liu
Keyword(s):  
Numerical Simulation ◽  
Drilling Fluid ◽  
Empirical Relationship ◽  
High Viscosity ◽  
Formation Damage ◽  
Low Permeability ◽  
Drilling Fluids ◽  
Drilling Operation ◽  
Fracture Damage ◽  
Low Permeability Reservoirs

AbstractUnderstanding the formation damage surrounding the well during the drilling operation is the key to predict damage degree and protect the formation in oil/gas reserviors. Based on the core drainage results, we obtained an empirical relationship between the invasion volume of drilling fluid and permeability reduction of formation. Furthermore, the equation is incorporated into a commercial reservior numerical simulation simulator to characterize the behaviors of drilling fluid invasion process. The results show that, although the invasion depth in low permeability reservoirs is short with the range of 1.7–2.5 m, the effect on recovery factor is significant due to the narrow seepage area in the near fracture region. When considering the formation damage, the pressure in the near-fracture damage region drops sharply, leading to a three-stage shape in pressure distribution curve. In addition, we found that high viscosity and low density oil-based slurry and shorter soaking period are conducive to decrease the formation damage during drilling operation. This work reveals the fundamental mechanisms of formation damage in low permeability reservoirs, which is a theoretical basis in formulation drilling fluids and optimization operation parameters.

Research on the Theories of Self-Synchronization of Dual Mass for Vibrating System with Two-Motor Drives

2013 ◽  
Vol 300-301 ◽  
pp. 928-931
Author(s):  
Duo Yang ◽  
Ye Li ◽  
He Li ◽  
Bang Chun Wen
Keyword(s):  
Average Method ◽  
Motor Drives ◽  
The Self ◽  
Vibration System ◽  
Mass Ratio ◽  
Vibration Model ◽  
Coupling Equations ◽  
Synchronous Operation ◽  
The Stability ◽  
Synchronization Theory

A vibration model is proposed and analyzed dynamically to study the self-synchronization theory of dual-mass vibration system. The differential equations of systematic motion are derived by applying Lagrange’s equations. Two uncertain parameters are introduced to derive the coupling equations of angular velocity of the two exciters. The conditions of synchronous implementation and stability are derived by utilizing the modified small parameter average method treated as non-dimension to the parameters. The swing of the vibration model plays a major role in the self-synchronization of two motors. The mass ratio of two eccentric blocks has an effect on the stability of synchronous operation.

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