bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on vibration characteristic simulation of the 220 kV gas insulated metal enclosed switchgear equipment
Authors: Wang X P , Jiang X P , Wang Q , Long Y K , Tan J W , Hao J 
Published: October 2019

Abstract
GIS equipment (gas insulated switchgear) is more and more popular in power system, and people often pay more attention to its discharge fault than other mechanical faults. But in the operation of GIS, besides discharge faults, mechanical faults are also a major cause of accidents. Therefore, we should give more research to abnormal mechanical vibration. At the same time, compared with discharge signal, mechanical vibration fault is more difficult to study. In this article, based on the size of real GIS equipment, we first built a three-dimensional model through COMSOL software to study the propagation characteristics of vibration signals. Simply considered, the bus air chamber is two-dimensional axisymmetric. Firstly, the natural vibration frequency of the equipment is calculated by finite element method, and the vibration propagation characteristics of GIS shield cover loose of the GIS equipment are calculated and analyzed. The simulation calculation shows that the longer the shell is, the lower the natural vibration frequency is. Therefore, we should pay more attention to the natural vibration frequency far away from 100 Hz, when designing and manufacturing GIS equipment, so as to avoid serious consequences caused by resonance. Because the basic vibration frequency caused by the loosening of shield cover is twice as high as the power frequency of 50 Hz. Then the 100 Hz simulation source is added to COMSOL model as the vibration source of loosening fault, and the propagation rule and characteristics of vibration fault about GIS are received. After the vibration fault occurs, the loosening vibration signal at the connection between the GIS shell and the basin insulator is the strongest. These conclusions by simulation also conform to objective rules and facts. Meanwhile it can guide us to arrange sensors reasonably and improve the signal-to-noise ratio of vibration detection signals.
Numerical modelling for the simulation of nonlinear ultrasound in liquids with gas bubbles
Authors: Vanhille C , Tejedor Sastre M T 
Published: October 2019

Abstract
Several numerical models have been developed in different configurations to simulate the behaviour of finite-amplitude ultrasound when interacting with tiny gas bubbles in a liquid. Since this interaction is highly nonlinear, specific models must be developed to understand the propagation of the waves in this kind of dispersive media for which their nonlinear and attenuation coefficients, as well as the sound speed, are extremely dependent on the ratio of the driven frequency to the bubble resonance. The bubble volume variation is mathematically modelled in the time domain through a Rayleigh-Plesset equation with terms up to the second order, whereas the time-dependent acoustic field relies on the wave equation in one or several dimensions. Both differential equations are coupled and auxiliary conditions are imposed. The differential systems are solved by the developed numerical models. In this paper we study in a three-dimensional resonator with axial symmetry how new harmonics obtained by nonlinear distortion can be enhanced by taking the nonlinear resonance effect into account, and we show that the generation of new frequency components by nonlinear frequency mixing exists. We also analyse the stable cavitation phenomenon in a three-dimensional focused field with axial symmetry by considering a nonlinear dependence of bubble generation in the liquid and the existence of primary Bjerknes forces.
Particle swarm optimization particle filter denoising algorithm with mutation operator
Authors: Chen H X , Fang L , Fan D L , Huang W J , Zhang G Y , Cao C H , Huang J M , Yang L 
Published: October 2019

Abstract
In this paper, a novel particle filter (NPSO-PF) algorithm is proposed, which is called particle cluster optimization particle filter algorithm with mutation operator, which is used for real-time filtering and noise reduction of nonlinear vibration signals. Because of its introduction of mutation operator, this algorithm has no problem that particle swarm optimization (PSO) algorithm is easy to fall into local optimal value and the calculation accuracy is not high. At the same time, through the mutation operation, the distribution and diversity of particles in the sampling process are improved, and the particle filter (PF) algorithm is solved in which the particles are poor and the utilization rate is not high. The mutation control function makes the particle set optimization process in the early and late stages, and improves the convergence speed of the particle set, which greatly reduces the running time of the whole algorithm. Simulation experiments show that compared with PF algorithm and PSO-PF algorithm, the proposed new particle swarm optimization particle filter (NPSO-PF) algorithm has lower root mean square error, shorter running time, higher signal to noise ratio and more stable filtering performance. It is proved that the algorithm is suitable for real-time filtering and noise reduction processing of nonlinear signals.
Numerical study of the reflected elastic waves using Rayleigh diffraction integral
Authors: Maghlaoui N , Djelouah H , Oudina A , Ourak M , Benmeddour F 
Published: October 2019

Abstract
In this work, the transient ultrasonic waves radiated by a linear phased array transducer in a liquid then reflected at a liquid solid interface is studied. A model based on the Rayleigh integral is used where the reflection at the plane interface is considered by using the reflection coefficients for harmonic plane waves. The transient field is obtained by an inverse Fourier transform of the harmonic field. The obtained results highlight the different components of the ultrasonic field: the direct and edge waves as well as the longitudinal head waves or leaky Rayleigh waves. The temporal representation of these waves has been analyzed and discussed by the rays’ model. Instantaneous cartographies allowed a clear description of all the waves which appear at the liquid-solid interface. The results have been compared to those obtained by using a finite element method.
Study on dynamic characteristics of horizontal suspension in engineering vehicle seat based on rolling vibration isolation principle
Authors: Yan Z H , Zhang X J , Liu G Q , Wang Z Y , Luo Y R 
Published: October 2019

Abstract
The low frequency horizontal vibration of engineering vehicles is a part of multidimensional vibration, which causes driver's occupational disease. Therefore, the design of low frequency horizontal vibration isolation is of great significance. The principle of rolling vibration isolation is applied to seat suspension for low frequency horizontal vibration isolation in this paper. The natural frequency characteristic model of horizontal suspension and the seat-human system dynamics model with horizontal suspension based on the Lagrangian equation are established. The dynamic characteristics of rolling horizontal suspension are studied on account of the established models. Results show that this horizontal suspension can achieve very low natural frequency so as to isolate the low frequency vibration in horizontal direction by the matching design of the rollers and concave dimensions. The vibration isolation characteristics of the front and back seat–human system are improved with the reduction of the rollers’ radius. The vibration isolation characteristic of the front and back seat - human system increases with the increase of the concave surfaces’ radius.
Piezo-actuated device for a bio-structural monitoring application through vibration-based condition and electromechanical impedance measurements
Authors: Barco D R , Tinoco H A , Cardona C I , Peña F M 
Published: October 2019

Abstract
This study presents a numerical and experimental development of a piezo-actuated device used for monitoring the stiffness variations of its support through electromechanical impedance measurements. The piezo-device and its components define a clamped beam system activated dynamically by two piezo-transducers that transmit vibrations to the support (monitoring substrate). An harmonic finite element analysis was carried out to understand the effects of the substrate properties on the dynamics of the piezo-device. Experimental tests corroborated the simulations with the correspondence of modal shapes and frequency response functions (FRFs) when the substrate varies its stiffness. A biomedical application was conducted in a bone specimen with three embedded teeth to monitor the stiffness variations induced by drillings in the bone. Results showed that the bone stiffness monitoring could be possible through the teeth due to that the drillings effect were quantified by electrical impedance signals.
Parameter optimization of centrifugal pump impeller
Authors: Zhang X Z , Wang Y W , Hu J S 
Published: October 2019

Abstract
After the hydraulic calculation of the centrifugal pump, some design parameters of the impeller can be obtained. The axial projection of the impeller can then be drawn by conventional methods, but in the process, the determination of some parameters in the axial projection map ignores whether it is an optimal solution. In this paper, orthogonal test method is used to determine the optimal solution and optimal combination of some design parameters in the axial projection map, to achieve multi-objective optimization, and to optimize the axial projection of the impeller, improve the flow curve of the impeller and improve Work efficiency.
Development and engineering application of high-precision and multi-function simulation system for double reheat ultra-supercritical units
Authors: Cai B L , Wang H C 
Published: October 2019

Abstract
Laiwu ultra-super critical double reheat unit is the highest ultra-super critical double reheat unit, with the highest parameters in China, from the safe and economical to run level put forward higher requirements. Taking ultra-super critical double reheat unit as the research object, a high-precision and multi-functional simulation system for ultra-super critical double reheat unit was developed before the unit was generated, to realize the dynamic analysis of ultra-super critical double reheat unit, control strategy verification and operation technique validation; and conduct operator operation and accident management training. provides technical support for the smooth construction, and safe and stable operation of the ultra-super critical double reheat unit.
Relation between stress intensity factor of circumferential crack and adhesive thickness in bonded round bar
Authors: Oda K , Kasamura Y , Nishi M , Tsutsumi N 
Published: October 2019

Abstract
The fracture of the bonded dissimilar materials generally occurs near the interface or at the interface edge. In this study, the stress intensity factors of the circumferential crack near the interface and the circumferential interface crack are analysed by the crack tip stress method. The relation between the dimensionless stress intensity factor of the circumferential crack and the adhesive thickness is investigated. The dimensionless stress intensity factors are defined by using the singular stress value at the crack tip point in bonded round bar without crack. The dimensionless stress intensity factors based on the singular stress value become constant irrespective of the adhesive thickness. In addition, the dimensionless stress intensity factor of the circumferential crack in bonded round bar is compared with that of the edge crack in bonded plate. Both factors coincide with each other when the geometrical condition and material combinations are the same.
A feather precision measurement method
Authors: Zhao Y P , Zhao J S 
Published: October 2019

Abstract
The methods of measurement of the microscopic and macroscopic morphology of feathers are discussed. A three-dimensional coordinate measuring machine and optical microscope are used together, that is, the macroscopic size of the feather is measured using the detection technology of the three-dimensional coordinate measuring machine, and the optical microscope is then used. The static accuracy error produced by the measurement result is (2.9064-4.0235) um, which is much smaller than the measurement error of 0.5 mm of the millimetre measuring ruler; The microscopic dimensions of the plume of the feather plume are measured by microscopy: the result is accurate to micron level, and the gradated scale is accurate to ± 0.5 mm. This study contributes to basic theoretical research in the fields of feather morphology, fractal analysis, and ecology.
Experimental study on dynamic characteristics of wire-cable vibration isolator
Authors: Wang H X , Chen D D , Ji Y Y 
Published: October 2019

Abstract
This study considers the dynamic experimental characteristics of the wire-cable vibration isolator. Orthogonal design scheme is adopted to reduce the test times. A wire-cable vibration isolator will be experimentally tested in the tension-compression mode to analyze its hysteretic behavior in more detail. Experimental data of restoring force and displacement are obtained through periodic test loading. The shape of hysteresis loops of vibration isolator under different excitation amplitudes, excitation frequencies and number of wire-cable loops have been obtained; the area of each hysteresis loop will be calculated by definite integral. The hysteresis loops under different conditions are studied, the results show that the wire-cable vibration isolator has excellent shock isolation characteristics; the isolator exhibits asymmetric hysteresis loops, which possess a hardening loading overlap in the loading curves. Finally, the key influence parameters of the dynamic characteristics are obtained, which establishes the foundation for designing the high performance wire-cable vibration isolator.
Contact force analysis in a planar mechanism with translational clearance joint considering complex contact modes
Authors: Qian M B , Qin Z , Yan S Z , Zhang L 
Published: October 2019

Abstract
A translational joint model with clearance was established. A contact mode identification method was derived on the basis of the classification of contact modes. The positional relationships were classified into three different contact modes. The identification method was applied to a planar mechanism with translational joint. The influences of clearance size and velocity on dynamic characteristics between them were studied. The mean square error value of contact force can be used to evaluate the influence of the clearance on the dynamic characteristics of the mechanism.
Study on parameter identification of vibration absorption system based on acceleration signal
Authors: Guo T N , Yang T , Gu Y C 
Published: October 2019

Abstract
Based on the analysis and processing of acceleration signals, the time domain least square method and frequency domain analytic method are proposed to identify the parameters of vibration absorption system. The mathematical model of vibration reduction and Simulink simulation system are established, two parameter identification methods are validated by known system parameters and vibration signals; and then, based on the acceleration signal, the influence of signal processing on identification accuracy is analyzed. The two identification methods proposed in this paper can accurately identify the parameters of the vibration absorption system, Finally, the experimental results show that the two identification methods have good engineering applicability and scientific research applicability.
Dynamic modelling and analysis of super-high acceleration macro-micro-macro movement platform
Authors: Zhang L F , Ma B , Wu J , Li H , Li G Q 
Published: October 2019

Abstract
In microelectronics manufacturing industry, to obtain the high-acceleration of Marco-micro movement platform was very crucial and difficult. In this paper, a new macromicro-macro movement platform is described. In addition, by the analysis of its driving principle, nine simplified dynamic models and dynamic equations under different motion conditions are established respectively. In different driving modes (single VCM driving mode, double VCMs reverse driving mode and double VCMs same driving mode, respectively), the displacement and velocity of floating stator, macro system and micro system was calculated, respectively. These results imply that the macro-micro-macro movement platform takes a periodic reciprocating motion and the max displacement and velocity of floating stator, macro system and micro system make different change rules, respectively. It concluded that the floating stator effectively isolating the vibration of macro-micro-macro movement platform.
Research on seismic absorption performance of adjacent structures with additional tuned mass dampers
Authors: Sun Q X 
Published: October 2019

Abstract
In order to investigate the seismic performance of adjacent structures with additional tuned mass dampers, this article takes two adjacent single degree of freedom systems as an example, and takes the transfer rate of displacement response of adjacent structures as performance index, analyses the relationship between damping parameters and structural parameters of adjacent structures with additional tuned mass dampers. The numerical relationship between the structural parameters of adjacent structures with tuned mass dampers, the parameters of tuned mass dampers, and Specific Performance of the adjacent structures in Earthquakes has been find out.The optimum structural parameters are obtained by theoretical deduction. Taking displacement response curve as an index, the reliability of the optimum structural parameters is verified.
Simulation design method of free boundary simulator for high precision spacecraft on orbit
Authors: Liu M H , Cao H , Gao H Y 
Published: October 2019

Abstract
The reproduction of on-orbit free boundary is one of the key technologies for highly accurate ground micro-vibration test of high precision optical spacecraft. This paper focuses on the simulation design method of the free boundary simulator based on finite element method (FEM). The preliminary design is modeled by one-dimensional spring elements, which is effective to optimize the critical design parameters. Then the detailed design model is established to verify the capability of strength, the stability and the modal performance of the free boundary simulator. The actual simulator is manufactured according to the simulation design. And the test of the actual simulator indicates that, the simulation results match well with the experimental results. The development of the free boundary simulator of spacecraft can be instructed effectively by the simulation method in this paper.
How to guarantee the results of investigations with limited statistical information
Authors: Voinov K , Esbulatova A 
Published: October 2019

Abstract
What kind of problems do researchers usually have after investigations connected with different physical processes (e.g., temperature, deterioration, pressure, vibration, and so forth)? In many mathematical papers, textbooks and reference books it is suggested that 340-360 statistical data are needed to obtain the right conclusion by experimentation [1-3]. In these cases, much money (and time, days and even months) will be required. Usually, researchers try to restrict the amount of statistical data to 3, 5, 10 or 30 data points. But in this case, they do not have enough information to determine the trustworthiness of their deductions. Our task is the following: to solve this problem and demonstrate the fact that if there are even only three points of observation, we can still obtain a convincing response/result. It is rather difficult to overestimate the significance of this achievement in practice.
Binding non-signatories to arbitration agreements—who are persons ‘claiming through or under’ a party?
Authors: Priskich Vicky 
Published: October 2019

Abstract
The International Arbitration Acts of the UK, Australia, Singapore, and Hong Kong recognize that third persons who are non-signatories to an arbitration agreement but who are ‘claiming through or under’ a party to the arbitration agreement have the status of a party.1 In the UK and Singapore that status means not only that court proceedings involving such non-signatories may be stayed in favour of arbitration but it also binds them to an award. In Hong Kong that status binds non-signatories to an award. In Australia, that status affects whether court proceedings involving non-signatories are stayed in favour of arbitration. A recent judgment by a majority of Australia’s highest appeal court, the High Court of Australia, in Rinehart v Hancock Prospecting Pty Ltd2 has taken a different approach to that prevailing in England as to the range of persons who are capable of ‘claiming through or under’ a party to the arbitration agreement, thereby significantly expanding the range of disputes involving non-signatories that must be referred to arbitration.3 The issue has not arisen for determination before appellate courts in Singapore or Hong Kong. Rinehart therefore represents an important development in common law jurisdictions, compelling arbitration between a signatory and non-signatory to an arbitration agreement.
The Arteries of the Central Forehead: Implications for Facial Plastic Surgery
Authors: Koziej Mateusz , Polak Jakub , Hołda Jakub , Trybus Marek , Hołda Mateusz , Kluza Piotr , Moskała Artur , Chrapusta Anna , Walocha Jerzy , Woźniak Krzysztof 
Published: October 2019

Abstract

Background
The forehead has substantial importance as an aesthetic unit. The central and supraorbital parts of this area are supplied by the supratrochlear (ST) and supraorbital (SO) arteries as well as the recently defined paracentral (PA) and central arteries.

Objectives
The authors aimed to assess the morphometry of the vessels of the forehead in the context of plastic surgery and minimally invasive cosmetic procedures.

Methods
This research included 40 cadavers directed for forensic autopsy and subjected to postmortem computed tomography angiography. In total, 75 hemifaces were examined for the course and location of arteries relative to the bones and surrounding structures.

Results
The arteries were observed as follows: ST in 97.3%, SO in 89.3%, and PA in 44.0%. The PA can be expected in the 13-mm-wide zone starting 2 mm laterally from the midline. The ST should be expected in the 10-mm-wide area extended laterally from the tenth millimeter from the midline, and the SO should be expected in the slightly wider (11 mm) area extending laterally from the 20th millimeter from the midline. For the proximal main trunks of the ST and SO arteries, we observed no overlap between the zones of occurrence, whereas the zones for the PA and ST main proximal trunks did overlap. No distinctive central artery was observed in the midline region of the forehead, but instead a network of small vessels in the midline region was visible.

Conclusions
The ST is the main and most conservative artery of this region and the PA is the most variable. A unique and detailed anatomical map was created to better understand the vasculature of the forehead area.