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University of Southampton MalaysiaAbout us
Email:
K.Ashari@soton.ac.uk

Dr Karim Ashari MEng, PhD

Assistant Professor, Aeronautics and Astronautics / Mechanical Engineering Lecturer

Dr Karim Ashari's photo

Dr. Karim Ashari graduated with a first-class honours Master of Engineering degree in Aerospace Engineering, before being awarded a PhD, both from the University of Southampton. He was the top student in his cohort in the final year of his undergraduate studies.

Prior to starting his PhD, he was an aircraft maintenance trainee. Karim studies wave dispersion in repetitive structures using mathematical and computational approaches in order to gain understanding of the underlying physics. Present research includes decaying waves in such structures. Apart from that, he is interested in application of acoustic black holes as a potentially lightweight solution to noise and vibration in industrial applications. He has wide teaching experience at UoSM, particularly in the delivery of Mechanical Engineering as well as Aeronautics and Astronautics programmes.

Research interests

  • Repetitive structures
  • Structural dynamics
  • Acoustic black hole

Sort via:TypeorYear
  • MATH1054/MATH1055 Mathematics For Engineering
  • FEEG1001 Design and Computing
  • SESA1015 Introduction to Aeronautics and Astronautics
  • FEEG2002 Mechanics, Machines & Vibration

Title: Vibrational characteristics of repetitive structure embedded with acoustic black hole

Principal Investigator: Karim Ashari (open for PhD application)

Introduction:

Acoustic black hole (ABH) is a passive vibration control technique in which a structure is modified to have a tapering end of power-law profile. A damping mechanism can be attached to the tip to extract vibrational energy. As such, ABH acts like a wave trap. So far, the ABH effects are observed and studied on continuous structures. This research aims to investigate how ABH effect can be embedded in discrete repetitive structures. Transfer matrix method will be employed in the study because it exploits periodicity of the structure and can be used with finite element method. The project will explore new ways of how ABH can be designed as a lightweight design solution to vibration mitigation problem, and as a cost-effective energy harvesting device.

Abstract:

Acoustic black hole (ABH) is a passive vibration control technique in which a structure is modified to have a tapering end of power-law profile. As an elastic wave travels within an ABH, its speed decreases but its amplitude grows. A damping or power extraction mechanisms can be attached to the tip to extract the vibrational energy. As such, ABH acts like a wave trap, i.e. it entirely absorbs the incoming wave energy. So far, various beams and plates embedded with ABH effect have been investigated. This research intends to investigate how the idea can be extended to discrete repetitive structures which is a common feature in infrastructure engineering and design. Transfer matrix method has been used extensively to study structures with translational symmetry. However, an ABH wedge is not translationally symmetric. This project will investigate and demonstrate how the transfer matrix method can be implemented on structures with scale symmetry.

Dr Karim Ashari
No. 3, Persiaran Canselor 1,
Kota Ilmu EduCity,
79200 Iskandar Puteri, Johor,
Malaysia

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