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An Analysis of the Auxetic Cranioplasty Implant 补体颅骨成形术的临床分析
Vibrations in Physical Systems Pub Date : 2020-01-01 DOI: 10.21008/J.0860-6897.2020.3.15
J. Maciejewska, H. Jopek
{"title":"An Analysis of the Auxetic Cranioplasty Implant","authors":"J. Maciejewska, H. Jopek","doi":"10.21008/J.0860-6897.2020.3.15","DOIUrl":"https://doi.org/10.21008/J.0860-6897.2020.3.15","url":null,"abstract":"The following paper is a reflection on the advisability of using auxetic structures in medical devices. For this purpose, a model of a skull implant was designed. This implant could be used for cranioplasty of bone defects after neurosurgical procedures. The implant is made of a titanium alloy and has an auxetic \"double arrow\" structure. The behavior of the implant was investigated in two cases, under the influence of increased intracranial pressure and impact of an external force. The calculations were made with the finite element method implemented in the SolidWorks 2020 program. Moreover, the natural frequency of the structure was examined in the Comsol Multiphysics program.","PeriodicalId":38508,"journal":{"name":"Vibrations in Physical Systems","volume":"31 1","pages":"2020315-1-2020315-8"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68248828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Recommendation for the Design of Composite Covers which Protect the Chassis of a Rail Vehicle 保护轨道车辆底盘的复合车盖设计建议
Vibrations in Physical Systems Pub Date : 2020-01-01 DOI: 10.21008/J.0860-6897.2020.1.07
M. Juzuń, W. Cholewa
{"title":"Recommendation for the Design of Composite Covers which Protect the Chassis of a Rail Vehicle","authors":"M. Juzuń, W. Cholewa","doi":"10.21008/J.0860-6897.2020.1.07","DOIUrl":"https://doi.org/10.21008/J.0860-6897.2020.1.07","url":null,"abstract":"","PeriodicalId":38508,"journal":{"name":"Vibrations in Physical Systems","volume":"31 1","pages":"2020107-1-2020107-8"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68247406","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
The Wavelet as the Evaluation Tool of Vehicles’ Seat Suspension System 小波作为汽车座椅悬架系统的评价工具
Vibrations in Physical Systems Pub Date : 2020-01-01 DOI: 10.21008/J.0860-6897.2020.2.06
S. Głowiński, A. Błażejewski
{"title":"The Wavelet as the Evaluation Tool of Vehicles’ Seat Suspension System","authors":"S. Głowiński, A. Błażejewski","doi":"10.21008/J.0860-6897.2020.2.06","DOIUrl":"https://doi.org/10.21008/J.0860-6897.2020.2.06","url":null,"abstract":"","PeriodicalId":38508,"journal":{"name":"Vibrations in Physical Systems","volume":"20 1","pages":"2020206-1-2020206-15"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68248195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Mathematical Model and Method of Determination of Amplitude-Frequency Characteristics of Corrugated Cylindrical Shells for Geometrically Nonlinear Vibrations 几何非线性振动下波纹圆柱壳幅频特性的数学模型及确定方法
Vibrations in Physical Systems Pub Date : 2020-01-01 DOI: 10.21008/J.0860-6897.2020.3.16
M. Marchuk, T. Goriachko, Bohdan Kindratskyy, V. Pakosh
{"title":"Mathematical Model and Method of Determination of Amplitude-Frequency Characteristics of Corrugated Cylindrical Shells for Geometrically Nonlinear Vibrations","authors":"M. Marchuk, T. Goriachko, Bohdan Kindratskyy, V. Pakosh","doi":"10.21008/J.0860-6897.2020.3.16","DOIUrl":"https://doi.org/10.21008/J.0860-6897.2020.3.16","url":null,"abstract":"On the basis of spatial geometrically nonlinear theory of elasticity by using quadratic approximations for components of the vector of displacements along the normal coordinate to the median surface is developed a new mathematical model of nonlinear dynamics of cylindrical shells with corrugated configuration for median surface. The perturbation method for the solution of systems of nonlinear differential equations for problems of determination of amplitude-frequency characteristics is generalized. In a combination of finite element and generalized perturbations methods, a new methodology for solving problems of free geometrically nonlinear vibrations of shells with complex guide geometry was developed and verified. With its help the influence of geometrical parameters of corrugating at circular coordinate on the main frequency of the elongated cylindrical panel is investigated.","PeriodicalId":38508,"journal":{"name":"Vibrations in Physical Systems","volume":"31 1","pages":"2020316-1-2020316-11"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68248978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Subspace Iteration Method for Eigenproblems of Frames with Viscoelastic Dampers Described Using Internal Variables 用内变量描述粘弹性阻尼器框架特征问题的子空间迭代法
Vibrations in Physical Systems Pub Date : 2020-01-01 DOI: 10.21008/J.0860-6897.2020.3.13
M. Łasecka-Plura
{"title":"The Subspace Iteration Method for Eigenproblems of Frames with Viscoelastic Dampers Described Using Internal Variables","authors":"M. Łasecka-Plura","doi":"10.21008/J.0860-6897.2020.3.13","DOIUrl":"https://doi.org/10.21008/J.0860-6897.2020.3.13","url":null,"abstract":"In the paper, the subspace iteration method is used to solve quadratic eigenproblems written for structures with viscoelastic dampers. This allows a certain previously assumed number of eigenvalues and corresponding eigenvectors to be determined. A shear frame with mass lumped on the storey level with built-in dampers is considered. Dampers are modelled with the classical Zener model. Equations of motion are written in the matrix form and include the internal variables resulting from built-in dampers. The subspace iteration method starts from adopting the number of sought solution for the quadratic eigenproblem, then the starting point of the iteration is determined and the iterative procedure is initiated. In each iterative loop the reduced quadratic eigenproblem with Hermitian matrices is solved by rearranging it into a state space form.","PeriodicalId":38508,"journal":{"name":"Vibrations in Physical Systems","volume":"31 1","pages":"2020313-1-2020313-8"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68249179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Application for Analysis of the Multiple Coherence Function in Diagnostic Signal Separation Processes 多重相干函数分析在诊断信号分离过程中的应用
Vibrations in Physical Systems Pub Date : 2020-01-01 DOI: 10.21008/J.0860-6897.2020.3.24
Mariusz Wądołowski, J. Pankiewicz, D. Markuszewski
{"title":"Application for Analysis of the Multiple Coherence Function in Diagnostic Signal Separation Processes","authors":"Mariusz Wądołowski, J. Pankiewicz, D. Markuszewski","doi":"10.21008/J.0860-6897.2020.3.24","DOIUrl":"https://doi.org/10.21008/J.0860-6897.2020.3.24","url":null,"abstract":"Diagnosing the condition of the machine during its operation by non-invasive methods is most often reduced to measuring the acceleration of vibrations occurring on the housing, as close as possible to the observed element or changes in sound pressure in the immediate vicinity of the machine. For proper inference about the condition of a given machine element, the registered signals should be undisturbed by signals coming from other components and free from external interference. In the case of simple stationary machines, it is quite simple, but in the case of more complex systems, such as a car, which in addition is in motion, things get complicated In the available literature we find examples of the effectiveness of using ordinary coherence function to separate signals from two independent sources[1,2,3]. This work presents attempt to build an algorithm that uses signals from a multi-point measurement system to analyze multiple coherence functions, which allows to separate signals from various sources. It can then get diagnostic information from the signal thus separated. The effectiveness of the algorithm was tested on a model simulating signal mixing, and then using signal coherence function and knowledge of the transmittance function, the signals were separated.","PeriodicalId":38508,"journal":{"name":"Vibrations in Physical Systems","volume":"31 1","pages":"2020324-1-2020324-8"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68249488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Accuracy of Prediction Methods for Sound Insulation of Homogeneous Single Baffles 均匀单隔板隔声预测方法的准确性
Vibrations in Physical Systems Pub Date : 2020-01-01 DOI: 10.21008/J.0860-6897.2020.2.10
K. Kosała, L. Majkut, D. Mleczko, R. Olszewski, T. Wszołek
{"title":"Accuracy of Prediction Methods for Sound Insulation of Homogeneous Single Baffles","authors":"K. Kosała, L. Majkut, D. Mleczko, R. Olszewski, T. Wszołek","doi":"10.21008/J.0860-6897.2020.2.10","DOIUrl":"https://doi.org/10.21008/J.0860-6897.2020.2.10","url":null,"abstract":"","PeriodicalId":38508,"journal":{"name":"Vibrations in Physical Systems","volume":"31 1","pages":"2020210-1-2020210-8"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68247790","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Finite Element Analysis of Natural Frequencies and Mode Shapes of The da Vinci Medical Robot Arm 达芬奇医疗机械臂固有频率和振型的有限元分析
Vibrations in Physical Systems Pub Date : 2020-01-01 DOI: 10.21008/J.0860-6897.2020.2.05
Helena Geda, Agata Kuliberda, T. Stręk
{"title":"Finite Element Analysis of Natural Frequencies and Mode Shapes of The da Vinci Medical Robot Arm","authors":"Helena Geda, Agata Kuliberda, T. Stręk","doi":"10.21008/J.0860-6897.2020.2.05","DOIUrl":"https://doi.org/10.21008/J.0860-6897.2020.2.05","url":null,"abstract":"This paper presents an analysis of the natural frequency and mode shapes of the arm and the working tip of the da Vinci robot, which is used in various types of surgical procedures. The survey was conducted using Autodesk Fusion 360. Using the da Vinci robot's construction data, a model was designed taking into account the characteristic dimensions and materials used. The obtained shapes of vibrations for natural frequencies allowed us to predict the influence of resonance phenomenon on the manipulator's arm. The movement of the tool along the wrong track, caused by an increase in vibration amplitude, may adversely affect the operation of the device. The results of the conducted research, therefore, provide information for which natural frequencies the values of these amplitudes increase.","PeriodicalId":38508,"journal":{"name":"Vibrations in Physical Systems","volume":"31 1","pages":"2020205-1-2020205-8"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68248147","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Free Axisymmetric Flexural Vibrations of Circular Plate with Symmetrically Varying Mechanical Properties Supported on Elastic Foundation 弹性基础上对称变化力学性能圆板的自由轴对称弯曲振动
Vibrations in Physical Systems Pub Date : 2020-01-01 DOI: 10.21008/J.0860-6897.2020.2.17
K. Magnucki
{"title":"Free Axisymmetric Flexural Vibrations of Circular Plate with Symmetrically Varying Mechanical Properties Supported on Elastic Foundation","authors":"K. Magnucki","doi":"10.21008/J.0860-6897.2020.2.17","DOIUrl":"https://doi.org/10.21008/J.0860-6897.2020.2.17","url":null,"abstract":"The subject of the paper is a circular plate with clamped edge supported on elastic foundation. Mechanical properties of the plate symmetrically vary in its thickness direction. Free axisymmetric flexural vibration problem of the plate with consideration of the shear effect is analytically studied. Two partial differential equations of motion based on the Hamilton principle are obtained. The system of equations is analytically solved and the fundamental natural frequency of axisymmetric vibration for example plates is derived.","PeriodicalId":38508,"journal":{"name":"Vibrations in Physical Systems","volume":"31 1","pages":"2020217-1-2020217-8"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68248386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Acoustic study of a Baroque church 巴洛克式教堂的声学研究
Vibrations in Physical Systems Pub Date : 2020-01-01 DOI: 10.21008/J.0860-6897.2020.2.28
A. Sygulska
{"title":"Acoustic study of a Baroque church","authors":"A. Sygulska","doi":"10.21008/J.0860-6897.2020.2.28","DOIUrl":"https://doi.org/10.21008/J.0860-6897.2020.2.28","url":null,"abstract":"The issue of sonic heritage in sacred historic buildings is gaining popularity and becoming a frequent subject of discussions. The Baroque St Joseph Church of Carmelite Fathers, a minor basilica, is, architecturally and culturally, an exceptional place in Poznań, a city located in western Poland. The church is often used as a concert venue. It underwent an acoustic study with the use of a sound source situated in the presbytery and on the pulpit. The aim of this paper is to present results of acoustic investigations and to compare its acoustic properties with other churches. Acoustic parameters acknowledged as primary values used to assess acoustic properties of a religious building were investigated and then compared with recommended values. Placement of the source in two measurement points rendered it possible to carry out speech intelligibility analyses for a variable position of the sound source, and, in effect, enabled functional assessment of the historic pulpit. Thus obtained results were compared with European Baroque churches whose parameters are available in the literature.","PeriodicalId":38508,"journal":{"name":"Vibrations in Physical Systems","volume":"31 1","pages":"2020228-1-2020228-9"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68248557","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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