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Antonio Papangelo's picture

Cyclic response of friction damped mechanical systems - PhD thesis - part II

This is the "part II" of my PhD thesis.

It addresses the problem of finding the dynamic cyclic response of mechanical systems experiencing dry friction with a particular focus on the influence of varying normal and tangential loads. I first start from a single degree of freedom model and gradually increase the complexity of the system. In the last chapter I address a system with 12 degrees of freedom which shows localized vibration states, that are very similar to solutions known in other physics fields like optics and fluid dynamics. 

ahmedettaf's picture

Localization and instability in sheared granular materials: Role of friction and vibration

Shear banding and stick-slip instabilities have been long observed in sheared granular materials. Yet, their microscopic underpinnings, interdependencies and variability under different loading conditions have not been fully explored. Here, we use a non-equilibrium thermodynamics model, the Shear Transformation Zone theory, to investigate the dynamics of strain localization and its connection to stability of sliding in sheared, dry, granular materials. We consider frictional and frictionless grains as well as presence and absence of acoustic vibrations.

WCFA2016-VFA – Workshop on Vibration Fatigue Analysis

Dear iMechanicians,

I would like to inform you about the workshop WCFA2016-VFA, which is this year organized with the focus set on Vibration Fatigue Analysis. The workshop will be held at the Czech Technical University in Prague, Czech Republic from November 8 to November 10, 2016. The introductory lessons in the first day will be presented by Prof Darrell Socie, Prof Milan Ruzicka and Dr Jan Papuga, while the main topic - Vibration Fatigue Analysis - will follow in next two days and will be covered by Dr Neil Bishop.

Open position (Post-doc)

Employment as an assistant researcher (Post-doc) at the project OPUS from National Centre of Science.

Details: http://www.perlikowski.kdm.p.lodz.pl/project.html

Postdoc position on multi-scale modelling of composites vibration response @ Ghent University (Belgium)

Nowadays, there is an increasing interest to use composite materials in automotive applications, in particular the use of fibre-reinforced plastics (carbon or glass fibres in a polymer matrix) is widely considered. The use of lighter materials, and hence a reduced fuel consumption, can be one of the possible solutions for reduced CO2 emissions.

Postdoc in multi-scale modelling of composites vibration response @ Ghent University (Belgium)

Nowadays, there is an increasing interest to use composite materials in automotive applications, in particular the use of fibre-reinforced plastics (carbon or glass fibres in a polymer matrix) is widely considered. The use of lighter materials, and hence a reduced fuel consumption, can be one of the possible solutions for reduced CO2 emissions.

Ji Wang's picture

Sharing a book draft on the vibration analysis of quartz crystal resonators

In collaborations with industrial engineers on the design and analysis of quartz crystal plate resonators, which involves the high frequency vibrations of piezoelectric plates with Mindlin plate equations, we have to go through the details of plate equations for every stages in the analysis.  In addition, complications and bias fields are also considered.  We have put together our papers and written a draft of a book detailing essential equations and methods.  We now share this draft with you if you would like to read some documents to know insights on this particular subject.

Ji Wang's picture

Faculty Positions in ALL Levels with the School of Mechanical Engineering & Mechanics, Ningbo University 宁波大学机械工程与力学学院招聘启事

The School of Mechanical Engineering and Mechanics, Ningbo University, is looking for cadidates for all subjects in the broad field of mechanical engineering and mechanics.  In addition to traditional field of impact and shock waves, piezoelectric devices, material durability, and metal forming, the school are also initiating new directions like vechicle engineering, fluid mechanics, occean engineering, solid mechanics, thermodynamics, vibrations, strength, and other related subjects.

Forced vibration

Here is how I have carried out the forced vibration
simulation. After an “intial step”, I chose “Linear Perturbation” to first
extract the natural frequency. My next step was “Modal Dynamics”. I then
applied the load in the form of a sine wave under the same step. I have an
isotropic material. When I try to submit the job, I received following warning:

Ji Wang's picture

Faculty Positions in School of Mechanical Engineering & Mechanics 宁波大学机械工程与力学学院招聘启事

The School of Mechanical Engineering and Mechanics, Ningbo University, is looking for cadidates for all subjects in the broad field of mechanical engineering and mechanics.  In addition to traditional field of impact and shock waves, piezoelectric devices, material durability, and metal forming, the school are also initiating new directions like vechicle engineering, fluid mechanics, occean engineering, and other related subjects.

Positions in ALL ranks are available.  Currently we are taking applications for 2014 school year.

Traffic-induced vibrations of frame structures

A paper titled "Traffic-induced vibrations of frame structures" (Marija Nefovska Danilovic, Mira Petronijevic, Branko Šavija), related to Branko Šavija's diploma thesis work, has been published in the Canadian Journal of Civil Engineering.

Abstract:

Payam Soltani's picture

Vibration of wavy single-walled carbon nanotubes based on nonlocal Euler Bernoulli and Timoshenko models

Vibration of wavy single-walled carbon nanotubes based on nonlocal Euler Bernoulli and Timoshenko models

By: Payam Soltani, A Kassaei, M M Taherian and A Farshidianfar

Structural Engineer / FE Analyst

TitanX is strengthening its numerical simulation capabilities. As part of this process, we are looking for two additional FE Analysts.

Prof. Neil Stephen is honoured for his outstanding engineering research paper

Neil Stephen, Professor of Structural Mechanics at the University of Southampton and editorial board member of the International Journal of Solids and Structures has received the first Doak Prize for an outstanding journal paper On Energy Harvesting from Ambient Vibration (JSV, 293,1/2, pp 409-425).

What's that Car Noise? New SIMULIA Tech Brief Available: NVH Analysis with Rolling Tires

The sources of noise in a vehicle are many, including the engine, driveline, tire contact patch and road surface, brakes, and wind to name a few.  A Noise, Vibration, and Harshness (NVH) engineer is tasked with predicting these noises early in the design phase to make the necessary adjustments to ensure a harmonic ride, so to speak. The latest SIMULIA Tech Brief illustrates the effects that rolling tires have in contributing to NVH.

Ji Wang's picture

Faculty Positions at Piezoelectric Device Laboratory, Ningbo University

The Piezoelectric Device Laboratory has immediate opennings for recent PhDs.  We are engaged in researchs in piezoeelctric acoustic wave resonators with supports from government and indsutry.  The Laboratory has been grwoing and we would like to have new members to accelerate the pace and expand collaborations with the fast growing piezoelectric acoustic wave device industry in China and other countries.

Ji Wang's picture

2010 Symposium on Piezoelectricity,Acoustic Waves, and Device Applications

CSTAM ASC  IEEE
2010 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications

December 10-13, 2010, Xiamen, Fujian,
China

Websitehttp://piezo.xmu.edu.cn/spawda10

 

Laleh Fatahi's picture

Potential energy of a string

Hi,

I have to use Hamilton pricinple to evaluate the diff. equation of motion of a string. As shown in the figure below, the string is hanged from one end and is free at the other. The flexural stiffness of the string is negligible.

I have a problem with the potential energy of the string! required in the Hamilton principle. Since the flexural stiffness of the string is assumed to be negligible, is there any other term for potential energy? 

 

Extended kantorovich method

Hallo every body,

who knows about Extended kantorovich method?

Material selection for vibration damping

Hi everyone,
 
 I'm searching some solution to absorb vibration. I'm trying to find materials and their properties to compare between them and chose one to design a vibration damper. Their application will be on the base of an avionics enclosure wich is onboard of a UAV (Unmanned Aerial Vehicle).

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