Nonlinear dynamics of a vibro-impact system subjected to electromagnetic interactions

Jong, Si-Chung (2015) Nonlinear dynamics of a vibro-impact system subjected to electromagnetic interactions. PhD thesis, University of Nottingham.

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Impact moling is an effective method of pile driving and percussive drilling to bore underground tunnel for various civil applications such as pipe, cable and ducts installation.

An effective electro-vibroimpact system has been built on the basis of interactions between two sources of electromagnetic force. A vertical downward progression of mechanism into hard or brittle material required an increased magnitude of impact force within a compact geometry. Horizontal progression into clay is tested by combining periodic impact and static forces that produces an effective progression rate.

As a consequence of this experimental work, a prototype electro-vibroimpact system is tested. Electrical circuitry consists of a timer and batteries which is a compact arrangement, functioning as waveform generator, and power supply. A cylindrical hollow aluminium tube houses the main components such as electromagnetic solenoids and oscillating bar within. This protects the main components from clay while progressing into soil and also reduces soil resistance with a minimal surface area.

A mathematical model has also been numerically solved for both single and two degreeof-freedom system. Correlation has been achieved to a certain extent, and it is possible either deploy or further optimise this system.

Item Type: Thesis (University of Nottingham only) (PhD)
Supervisors: Woo, Ko-Choong
Popov, Atanas
Keywords: nonlinear theories, structural dynamic, vibration, impact (mechanics), shock (mechanics)
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA 630 Structural engineering (General)
Faculties/Schools: University of Nottingham, Malaysia > Faculty of Science and Engineering — Engineering > Department of Mechanical, Materials and Manufacturing Engineering
Item ID: 28011
Depositing User: JONG, SI-CHUNG
Date Deposited: 08 Dec 2017 04:56
Last Modified: 03 Feb 2018 17:42

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