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.

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.

Development of Simultaneous Analysis Method for Multi-Compounds Content of New Shilajit Using HPLC-UV and the Cognitive Enhancing Effect: Mongolian Shilajit

2021 ◽  
Vol 16 (7) ◽  
pp. 1934578X2110304
Author(s):  
SukJin Lee ◽  
HyeSung Ryu ◽  
WanKyunn Whang
Keyword(s):  
Quality Control ◽  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
High Performance ◽  
High Resolution Mass Spectrometry ◽  
Radical Scavenging ◽  
Original Material ◽  
Analysis Method ◽  
Quality Control Standard ◽  
Quantitative Hplc Analysis

Shilajit has a longstanding use as an anti-aging and memory enhancing drug. It is known to have excellent anti-bacterial effects and is believed to be effective for cognitive enhancement, but is difficult to standardize because of the lack of quality control standards. This study, for the first time, proposes a quality control standard using a simultaneous analytical method for the drug’s multi-compound content using high-performance liquid chromatography-ultraviolet detection (HPLC-UV) as an aid for the internationalization of Mongolian Shilajit. Phenolic compounds 1-6 were isolated from Mongolian Shilajit extract using bioassay-guided isolation, and the isolated compounds were evaluated for cognitive-related anti-Alzheimer’s disease (AD) activities using 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical-scavenging, acetylcholinesterase (AChE), butyrylcholinesterase (BChE), β-site amyloid precursor protein-cleaving enzyme 1 (BACE1), and advanced glycation end-product (AGE) formation assays. The isolated compounds showed good effects for each activity. In addition, the isolated compounds were successfully quantified using a validated quantitative HPLC analysis method. As a result, the isolated compounds were suggested as standard marker compounds for Mongolian Shilajit. Also, we proved that the original material of Mongolian Shilajit is a lichen named Xanthoparmelia somloensis (Gyel.) Hale using HPLC-UV, ultra-high-performance liquid chromatography-electrospray ionization/hybrid linear trap-quadruple-orbitrap-high-resolution mass spectrometry (UHPLC-ESI/LTQ-HRMS).

Mechanics Analysis and Dynamic Modeling of a Wall Climbing Robot

2013 ◽  
Vol 753-755 ◽  
pp. 2001-2005
Author(s):  
Wei Jie Bo ◽  
Xue Shan Gao ◽  
Fang Xing Li ◽  
Yi Tong Ma ◽  
Yun Fei Cui
Keyword(s):  
Dynamic Model ◽  
Lagrange Equation ◽  
Analysis Method ◽  
Climbing Robot ◽  
Centrifugal Blower ◽  
Effective Utilization ◽  
Velocity Function ◽  
Flexible Wall ◽  
Optimization Mechanism ◽  
Driving Torque

A kind of theoretical analysis method in wall climbing robot design is presented in this paper. Using this method, a flexible wall climbing robot is developed that can be well adopted in small irregular places. Firstly, an optimization mechanism is given based on the effective utilization of aerodynamic attraction produced by a centrifugal blower. Kinematics model of the robot is represented, then linear velocity function and angular velocity function of the robot are deduced. Dynamic model based on Lagrange equation is established, which can be a theoretical foundation for control system design. Finally, simulation results show that the dynamic model and the method are reliable since the curves of driving torque match the change of negative pressure.

scholarly journals Rapid Analysis Method for Paraquat and Diquat in the Serum Using Ion-Pair High-Performance Liquid Chromatography

2005 ◽  
Vol 28 (4) ◽  
pp. 725-728 ◽  
Author(s):  
Mika Ito ◽  
Yasushi Hori ◽  
Manami Fujisawa ◽  
Akira Oda ◽  
Shinichiro Katsuyama ◽  
...  
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
High Performance ◽  
Rapid Analysis ◽  
Ion Pair ◽  
Analysis Method

scholarly journals Simultaneous Qualitative and Quantitative Evaluation of the Coptidis Rhizoma and Euodiae Fructus Herbal Pair by Using UHPLC-ESI-QTOF-MS and UHPLC-DAD

Molecules ◽  
2020 ◽  
Vol 25 (20) ◽  
pp. 4782
Author(s):  
Yan-Ying Li ◽  
Min-Qun Guo ◽  
Xue-Mei Li ◽  
Xiu-Wei Yang
Keyword(s):  
High Performance ◽  
Analysis Method ◽  
Chinese Medicines ◽  
Chemical Profiling ◽  
Qualitative And Quantitative ◽  
Flight Mass Spectrometry ◽  
Chinese Medicine Formula ◽  
Quantification Analysis ◽  
Coptidis Rhizoma ◽  
And Control

The herbal pair of Coptidis Rhizoma (CR) and Euodiae Fructus (EF) is a classical traditional Chinese medicine formula used for treating gastro-intestinal disorders. In this study, we established a systematic method for chemical profiling and quantification analysis of the major constituents in the CR-EF herbal pair. A method of ultra high performance liquid chromatography/quadrupole time-of-flight mass spectrometry (UHPLC-QTOF-MS) for qualitative analysis was developed. Sixty-five compounds, including alkaloids, phenolics, and limonoids, were identified or tentatively assigned by comparison with reference standards or literature data. The UHPLC fingerprints of 19 batches of the CR-EF herbal pair samples were obtained and the reference fingerprint chromatograms were established. Furthermore, nine compounds among 24 common peaks of fingerprints were considered as marker components, which either had high contents or significant bioactivities, were applied to quality control of the CR-EF herbal pair by quantitative analysis. This UHPLC-DAD analysis method was validated by precision, linearity, repeatability, stability, recovery, and so on. The method was simple and sensitive, and thus reliable for quantitative and chemical fingerprint analysis for the quality evaluation and control of the CR-EF herbal pair and related traditional Chinese medicines.

scholarly journals An Automated and High-Throughput Immunoaffinity Magnetic Bead-Based Sample Clean-Up Platform for the Determination of Aflatoxins in Grains and Oils Using UPLC-FLD

Toxins ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 583 ◽  
Author(s):  
Zhihong Xuan ◽  
Jin Ye ◽  
Bing Zhang ◽  
Li Li ◽  
Yu Wu ◽  
...  
Keyword(s):  
High Throughput ◽  
High Performance ◽  
Cost Effective ◽  
Magnetic Bead ◽  
The Novel ◽  
Analysis Method ◽  
Automated Method ◽  
Accuracy And Precision ◽  
Optimized Conditions

Sample clean-up remains the most time-consuming and error-prone step in the whole analytical procedure for aflatoxins (AFTs) analysis. Herein, an automated and high-throughput sample clean-up platform was developed with a disposable, cost-effective immunoaffinity magnetic bead-based kit. Under optimized conditions, the automated method takes less than 30 min to simultaneously purify 20 samples without requiring any centrifugation or filtering steps. When coupled to ultra-high performance liquid chromatography with fluorescence detection, this new analysis method displays excellent accuracy and precision as well as outstanding efficiency. Furthermore, an interlaboratory study was performed in six laboratories to validate the novel protocol. Mean recovery, repeatability, reproducibility, and Horwitz ratio values were within 91.9%–107.4%, 2.5%–7.4%, 2.7%–10.6%, and 0.26%–0.90, respectively. Results demonstrate that the developed sample clean-up platform is a reliable alternative to most widely adopted clean-up procedures for AFTs in cereals and oils.

Binding study of desethyloxybutynin using high-performance frontal analysis method

2002 ◽  
Vol 768 (1) ◽  
pp. 189-197 ◽  
Author(s):  
Akimasa Shibukawa ◽  
Yuki Yoshikawa ◽  
Tomoko Kimura ◽  
Yukihiro Kuroda ◽  
Terumichi Nakagawa ◽  
...  
Keyword(s):  
High Performance ◽  
Binding Study ◽  
Frontal Analysis ◽  
Analysis Method

A Study on the Flow Field Simulation of Insertion Flow Sensor in Large Diameter Pipeline

2014 ◽  
Vol 487 ◽  
pp. 470-474
Author(s):  
Jian Zhen Chen ◽  
Bin Li ◽  
Hui Wang ◽  
Xiao Man Lian ◽  
Yu Ming Xu
Keyword(s):  
Flow Field ◽  
Field Distribution ◽  
Vortex Shedding ◽  
High Performance ◽  
Cfd Simulation ◽  
Large Diameter ◽  
Flow Sensor ◽  
Analysis Method ◽  
Diameter Pipe ◽  
Important Basis

The study is to employ the analysis method of CFD simulation, when putting the insertion flow sensor in large-diameter pipe, to analyse the characteristics of flow field distribution of the insertion flow sensor in detail. It reveals the flow field distribution at the position of average flowrate and the vortex shedding around insertion flow sensor, which provides an important basis for design of the insertion flow sensor with high performance.

MrBayes tgMC3++: A High Performance and Resource-Efficient GPU-Oriented Phylogenetic Analysis Method

2016 ◽  
Vol 13 (5) ◽  
pp. 845-854 ◽  
Author(s):  
Cheng Ling ◽  
Tsuyoshi Hamada ◽  
Jingyang Gao ◽  
Guoguang Zhao ◽  
Donghong Sun ◽  
...  
Keyword(s):  
Phylogenetic Analysis ◽  
High Performance ◽  
Analysis Method
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