Nonlinear Dynamic Analysis on Dual-Rotor-Bearing-Casing System for Marine Gas Turbine by Zhikai Xing, Qiang Wang, Yongbao Liu, Mo Li, Xin Zhang

“…To alleviate the vibration jump phenomenon, the radial clearance should be reduced to improve the coupling between the high- and low-pressure rotors. …”
Get full text

Vibration Analysis of Driving-Point System with Uncertainties Using Polynomial Chaos Expansion by Bin Xiao, Yu-long Zhou, Chao Gao, Shuang-Xia Shi, Ze-Xi Sun, Zong-biao Song

“…A vibration transfer analysis method based on polynomial chaos expansion (PCE) is proposed in this study and is used to analyze the stochastic dynamic compliance of uncertain systems with the Gaussian distribution. …”
Get full text

Study on dynamics characteristic on combination misalignment and rubbing of the dual-rotor system by YAO Xia, NAN Guofang, LI Yao, QIU Xuewen

“…The misalignment of the dual-rotor system for the aero-engine will lead to abnormal increase of the vibration which results in the rotor-stator rubbing and affects the safty and stability of the rotor operation.The dual-rotor system was taken as the research object.Considering the combination misalignment-rubbing fault, the dynamic model of the rotor system is established based on the lumped mass method.The differential equation of the system motion was established according to the Lagrange equation, and the Range-Kutta method was used to solve it.The influence mechanism of the key parameters such as the speed, the misalignment angle and the coupling misalignment on the nonlinear dynamic characteristics of the system was studied.The results show that the system presents complex dynamic characteristics such as periodic, multi-periodic, quasi-periodic and chaotic motion with the increase of the rotor’s speed.When the speed is in the range of 1 500-2 200 rad/s, the system switches between periodic 2 motion and chaotic state through multiple paroxysmal bifurcations and paroxysmal inverted bifurcations.There are nonlinear phenomena such as jump in the bifurcation diagram of the vibration response with the change of the parallel misalignment of the coupling.As the misalignment angle of the bearing increases, the chaotic interval of the high speed decreases, and the stable periodic motion interval increases.…”
Get full text

DEVELOPMENTAL PROGRAMMES AND POLICIES: A LOGIC MODEL APPROACH by Obuks Augustine EJOHWOMU, Morakinyo Kehinde ONIFADE, Babatunde ADEOYE

“…The implication, therefore, is that there is urgent need to encourage ‘productive’ infrastructural development, which will jump start a knowledge based economy in the medium-term, and a serviced based economy in the long-term. …”
Get full text

Prediction of Thermal Conductivity of a Rock Wool Board by Computer X-Ray Tomography Technique Scanning and Random Generation-Growth Model by Xiaoguang Li, Rui Zhang, Diya Zhang, Xin Fan, Meiqi Guo, Jinyi Qin

“…An ideal CT-RGG structure model of rock wool boards (CT-random generation-growth model) was established by simplifying material properties based on the mesostructure parameters of the RGG model. …”
Get full text

An Improved Particle Swarm Optimization-Powered Adaptive Classification and Migration Visualization for Music Style by Xiahan Liu

“…Based on the adaptive particle swarm algorithm and error backpropagation neural network, this paper proposes methods for different styles of music classification and migration visualization. …”
Get full text

A computational tool to infer enzyme activity using post-translational modification profiling data by Dehui Kong, Aijun Zhang, Ling Li, Zuo-Fei Yuan, Yingxue Fu, Long Wu, Ashutosh Mishra, Anthony A. High, Junmin Peng, Xusheng Wang

“…The JUMPsem program is scalable and publicly available as an open-source R package and user-friendly web-based R/Shiny app. Collectively, JUMPsem provides an improved tool for inferring protein enzyme activities, potentially facilitating targeted drug development.…”
Get full text

Relationship between dietary intake and growth and development in Chinese pupils by Wen Fang, Ye Fu, Qin Li, Menghan Cheng, Miao Zhang, Yu Lu

“…Certain associations retained significance even after stratified analysis based on gender and frequency of dietary intake.ConclusionDietary diversity score and their respective food groups such as meat, milk, coarse grain, soybean and vegetable will impact growth and development indicators, requiring purposefully controlled dietary intake.…”
Get full text

Nonlinear Dynamic Analysis of the Cutting Process of a Nonextensible Composite Boring Bar by Bole Ma, Yongsheng Ren

“…The motion equation of nonlinear chatter of the cutting system is derived based on the Hamilton principle. The partial differential equation of motion is discretized using the Galerkin method to obtain a 1-dof nonlinear ordinary differential equation in a generalized coordinate system. …”
Get full text

Intermittent Flow Regimes in a Transonic Fan Airfoil Cascade by J. Lepicovsky, E. R. McFarland, R. V. Chima, V. R. Capece, J. Hayden

“…Flush-mounted, high-frequency response pressure transducers indicated large local jumps in the pressure in the leading edge area, which generates large intermittent loading on the blade leading edge. …”
Get full text

Data Imputation for Detected Traffic Volume of Freeway Using Regression of Multilayer Perceptron by Xiang Wang, Yingying Ma, Shengwen Huang, Yu Xu

“…Also, 32 groups of simulated imputation experiments based on the detected traffic volume of road sections in the Guangdong freeway system are conducted, which take the scenarios of continuous missing and jumped missing into account. …”
Get full text

Numerical Simulation Study on Aeroacoustic Characteristics within Deformable Cavities by Ning Fangli, Ning Shunshan, Zhang Changtong, Liu Zhe

“…A new active control method was proposed based on the deformable cavity in order to mitigate the cavity noise. …”
Get full text

Investigation of the Effect of Confining Pressure on the Mechanics-Permeability Behavior of Mudstone under Triaxial Compression by Lu Shi, Zhijiao Zeng, Zhiming Fang, Xiaochun Li

“…In addition, the mudstone transformed to the ductile failure mode when the effective confining pressure was greater than 35 MPa, which means that the permeability did not jump within a small strain. Finally, a practical strain-based model of permeability evolution that separately considers compaction and dilatancy was proposed, and the predicted permeability values were in good agreement with the experimental results. …”
Get full text

Effects of Coach’s Verbal Encouragement During Small-Sided Volleyball Games on Specific Physical Fitness and Technical-Tactical Behavior of Youth Athletes by Taufiq Hidayat, Irma Febriyanti, Advendi Kristiyandaru, Suroto, Hari Wisnu, Ahmet Kurtoğlu, Amayra Tannoubi, Joseph Lobo, Baglan Yermakhanov, Jarosław Muracki, Edi Setiawan

“…In addition, there were differences in technical-tactical behavioral factors based on time effects (all, p < 0.05), interaction factors (p < 0.05), except service (p > 0.05), and group factors (all, p < 0.05). …”
Get full text

Grid-Forming Inverters: A Comparative Study of Different Control Strategies in Frequency and Time Domains by Nabil Mohammed, Harith Udawatte, Weihua Zhou, David J. Hill, Behrooz Bahrani

“…This article examines the performance of GFMIs when equipped with four different control strategies, namely, droop-based GFMI, virtual synchronous generator (VSG)-based GFMI, compensated generalized VSG (CGVSG)- based GFMI, and adaptive VSG (AVSG)-based GFMI. …”
Get full text

Rupture and Migration Law of Disturbed Overburden during Slicing Mining of Steeply Dipping Thick Coal Seam by Shuai Liu, Ke Yang, Chunan Tang, Xiaolou Chi

“…The three-stage AE positioning morphological characteristics and DBS response stepped jump patterns were analyzed in detail. The research results are considered instrumental in the combined AE and DBS monitoring of deformation and damage of rock and soil structures.…”
Get full text

An Anterior Cruciate Ligament (ACL) Injury Risk Screening and Reduction Program for High School Female Athletes: A Pilot Study by Allison Kuntz, Olivia Peters, Andrew Bello, Ryan Perkins, Ryan Monti, Leigh Murray

“…A pre-season screening program was designed encompassing four stations that addressed modifiable neuromuscular and biomechanical risk factors including range of motion (ROM), jump-landing technique, strength, and balance. Athletes were categorized into high-risk versus low-risk groups based on cutoff scores previously established in the literature…”
Get full text

Effects of single dose of beta alanine on performance in weight lifters by Gaurav Shorı, Ravinder Bachal

“…The aim of present study is to see the effects of single dose of beta alanine on performance in weight lifters. 20 male weight lifters (age 23.95±1.23 years) were selected based on inclusion and exclusion criteria. Subjects were randomly divided into two groups. …”
Get full text

Modeling a Mechanical Molecular Spring Isolator with High-Static-Low-Dynamic-Stiffness Properties by Zhanyong Li, Qian Chen, Fengshou Gu, Andrew Ball

“…The stiffness model of the MMSI with several identical accumulators is established based on the hydrostatic law. After that, some parameters that significantly influence the stiffness characteristics are studied. …”
Get full text

Method for Calculating Transients in a Gas Pipeline by A. S. Fikov

“…The obtained analytical model of unsteady gas flow makes it possible, without using the Duhamel integral, to find analytical solutions under more complex boundary conditions than the flow rate jump. At the same time, the solutions found completely coincide with the solutions based on the Duhamel integral, but in the course of the solution that we have found it is possible to avoid integration, which has a positive effect on the applicability of this approach in the practice of engineering calculations.…”
Get full text