OLADOSU SURAJU AREMU

Mechanical Engineering

At the Mechanical Engineering department office

Appointment on Visitation important

Topic: Fluid And Structure Interaction

Description:

When fluids conveyed by pipelines exceed critical velocity or are excited, instability sets in. If this is not properly controlled, it may result in the failure of the pipeline and cause other consequential effects. This study seeks to verify the impact of discontinuous elastic foundation on simply supported pipes conveying cold and hot fluids subjected to an external excitation. The discontinuous elastic foundations are modeled as second and sixth order polynomial functions, while the pipe is modeled as linear elastic beam. The different cases considered are rock and sand at support A (case 1), sand and rock at support B (case 2);sand at the support A and rock at the support B ( case 3);sand and rock at the middle away from the supports (case4). In all these cases, pipe resting on each foundation conveying both cold and hot fluids were subjected to free and forced vibration.

Numerical solutions are obtained using finite element method. The results show that response of linear pipes resting on non-uniform foundation mimics those of nonlinear pipes resting on linear foundation for the forced vibration and for the free vibration, for hot fluid the pipe buckle earlier than cold fluid. While some parameters make the foundation to be of destabilizing effect, others stabilize. For some parameters like fluid velocity, co-efficient of elastic foundation, and damping co-efficient, the non-uniform foundation modeled as a sixth order polynomial function act as a vibration absorber.

#	Certificate	School	Year
1.	Ph.D (Mechanical Engineering)	University of Lagos	2022

ANALYTICAL INVESTIGATIONS OF THERMAL MAGNETIC EFFECTS ON NONLINEAR VIBRATION OF CARBON NANOTUBE IN A MULTILAYER ELASTIC MEDIA USING DIFFERENTIAL TRANSFORMATION METHOD

Introduction:

Discovering the Nanostructure materials and such has led to the development of nanobeams, nano-electronics, nanodevices, nanomechanical systems, nonbiological, and nanocomposites due to their excellent properties and high strength-to-weight ratio. Such theoretical investigation and analyses of the carbon nanotubes have been extended to multi-walled carbon nanotubes. With the aid of the differential transformation method coupled with cosine after-treatment technique, nonlinear vibration analysis of a nanotube in a multi-elastic media subjected to the thermal magnetic field is presented

Aim:

To use differential transformation method coupled with cosine after treatment technique

Objective:

To use Galerki decomposition techniques are used to decompose the nonlinear vibration model into spatial and temporal components.

Methodology:

Using the differential Transformation method 

Result:

The development of the analytical solution, MATLAB was used to simulate the symbolic solution and present the results in graphical forms 

Contribution To Knowledge: 

It is demonstrated that as the dimensionless amplitude increases the frequency ration increased due to the hardening spring behaviors of the nanobeams

 

 

OLADOSU SURAJU is a Lecturer I at the Department of Mechanical Engineering

OLADOSU has a Ph.D in Mechanical Engineering from University of Lagos