Mingjun Du
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View article: Synchronization of coaxial co–rotating tri-exciter with two torsional springs in far-resonance system
Synchronization of coaxial co–rotating tri-exciter with two torsional springs in far-resonance system Open
To propose a vibration system with coaxial elastic-coupled tri-exciters, which can achieve in-phase (the phase difference angle is close to 0°) synchronization and operate stably. Solving the problem of excitation force cancellation caused…
View article: Integrated metabolomic and transcriptomic analyses elucidate anthocyanin-mediated flesh coloration mechanisms in red-fleshed pear
Integrated metabolomic and transcriptomic analyses elucidate anthocyanin-mediated flesh coloration mechanisms in red-fleshed pear Open
The red-fleshed pears embody a unique and invaluable genetic resource. However, the specific types of metabolites in red-fleshed pears and its molecular mechanisms remain largely unknown. To understand these, targeted carotenoid and anthoc…
View article: Prediction of pressure drop in heavy oil water ring based on modified two fluid model
Prediction of pressure drop in heavy oil water ring based on modified two fluid model Open
Accurate prediction of pressure drop of the heavy oil-water ring flow in pipeline is of great significance for establishing an optimal drag reduction model and ensuring safe production. The effects of different factors on the flow pattern …
View article: Observation of a vector charmoniumlike state at 4.7 ${\rm GeV}/c^2$ and search for $Z_{cs}$ in $e^+e^-\to K^+K^-J/ψ$
Observation of a vector charmoniumlike state at 4.7 ${\rm GeV}/c^2$ and search for $Z_{cs}$ in $e^+e^-\to K^+K^-J/ψ$ Open
Using data samples with an integrated luminosity of 5.85~fb$^{-1}$ collected at center-of-mass energies from 4.61 to 4.95 GeV with the BESIII detector operating at the BEPCII storage ring, we measure the cross section for the process $e^+e…
View article: Design of three-stage sealing structure and investigation of sealing performance for 7000 fracturing plunger pump
Design of three-stage sealing structure and investigation of sealing performance for 7000 fracturing plunger pump Open
As a key component of the drilling mud pump, the plunger seal often has problems such as seal failure in reconstruction of low-permeability sandstone reservoirs and the development of unconventional reservoirs, which, in turn, leads to low…
View article: Synchronization and Stability of a Three Co-Rotating Rotor System Coupled with Springs in a Non-Resonance System
Synchronization and Stability of a Three Co-Rotating Rotor System Coupled with Springs in a Non-Resonance System Open
With the rapid development of horizontal drilling technology, the drilling fluid shale shaker (DFSS) features high capacity and high efficiency. Hence, a vibrating mechanism of a three co-rotating rotor system coupled with springs is propo…
View article: Experimental Study on Heavy Oil Drag Reduction in Horizontal Pipelines by Water Annular Conveying
Experimental Study on Heavy Oil Drag Reduction in Horizontal Pipelines by Water Annular Conveying Open
Transportation of heavy oil by the so-called water-ring technique is a very promising method by which pressure drop and pollution can be significantly reduced. Dedicated experiments have been carried out by changing the phase's density, vi…
View article: Study on drag reduction of annular heavy oil transport based on thin oil boundary layer
Study on drag reduction of annular heavy oil transport based on thin oil boundary layer Open
In this paper, thin oil is used as the boundary layer fluid to carry out the drag reduction experiment of heavyoil. The research shows that when the ratio of the thin oil reaches 45%~50%, the decrement of annular dilution pressure is nearl…
View article: Experimental Investigation on Synchronization of Two Co-Rating Rotors Coupled With Nonlinear Springs
Experimental Investigation on Synchronization of Two Co-Rating Rotors Coupled With Nonlinear Springs Open
This work is a continuation and verification of the original literature by using experimental strategy. Based on the published paper, in order to avoid anti-phase synchronization with two co-rotating rotors system, a vibrating system with …
View article: Synchronous state of unbalanced rotors in a three-dimensional space and far-resonance system
Synchronous state of unbalanced rotors in a three-dimensional space and far-resonance system Open
The unreasonable dynamic characteristics results in decrease of screening efficiency of the vibrating screen. However, the synchronous behavior of motors is key factor to determine dynamic characteristics of the screens. In this paper, two…
View article: Spatial synchronization of unbalanced rotors excited with paralleled and counterrotating motors in a far resonance system
Spatial synchronization of unbalanced rotors excited with paralleled and counterrotating motors in a far resonance system Open
1. Balthazar J., Felix J., Brasil R., 2004, Short comments on self-synchronization of two non-ideal sources supported by a flexible portal frame structure, Journal of Vibration and Control, JVC, 10, 12, 1739-1748. Google Scholar
View article: Investigation for synchronization of two co-rotating rotors installed with nonlinear springs in a non-resonance system
Investigation for synchronization of two co-rotating rotors installed with nonlinear springs in a non-resonance system Open
To avoid anti-phase synchronization for two co-rotating rotors system that occurs so that exciting force generated by the vibrating system is very small, a mechanical model of two co-rotating rotors installed with nonlinear springs is prop…
View article: Synchronization and stability of an elastically coupled tri-rotor vibration system
Synchronization and stability of an elastically coupled tri-rotor vibration system Open
A new mechanism, an elastically coupled tri-rotor system, is proposed to implement synchronization. It is composed of a rigid body, three...
View article: Synchronous behavior of a rotor-pendulum system
Synchronous behavior of a rotor-pendulum system Open
Rotor-pendulum systems are widely applied to aero-power plants, mining screening machineries, parallel robots, and other high-speed rotating equipment. However, the investigation for synchronous behavior (the computation for stable phase d…
View article: Synchronization and Stability of Elasticity Coupling Two Homodromy Rotors in a Vibration System
Synchronization and Stability of Elasticity Coupling Two Homodromy Rotors in a Vibration System Open
The mechanical model of an elasticity coupling 1-DOF system is proposed to implement synchronization; the simplified model is composed of a rigid body, two induction motors, and a connecting spring. Based on the Lagrange equations, the dyn…
View article: Synchronization investigation of vibration system of two co-rotating rotor with energy balance method
Synchronization investigation of vibration system of two co-rotating rotor with energy balance method Open
The key technology of vibrating screens’ design is how to ascertain the synchronous state of vibrating systems. The occurrence of synchronization of a model, two co-rotating rotors fast excited by induction motors installed in a vibrating …