Photo of Professor Huajiang Ouyang

Professor Huajiang Ouyang PhD

Professor Mechanical, Materials & Aerospace Eng

Research

Structural Dynamics and Control

Friction-induced vibration (general nonlinear vibration, brake squeal and other brake noise, turning chatter):
Friction is everywhere. It is usually a source of energy dissipation, but sometimes can cause vibration. The latter includes brake squeal, squeaky hinges, machining chatter, etc. Friction also causes wear and heat conduction. Contact must be considered in friction-induced vibration. This remains a challenging and interesting research subject. TRW Automotive and Jaguar Land Rover are two sponsors of this research topic of mine.

Moving-load dynamic problems (vehicle-track-bridge dynamic interaction, spinning discs, turning chatter):
Most loads are fixed in space but some loads are in relative motion to the structures, for example, a train crosses a bridge and runs through a tunnel, a computer spins past a reader/writer head. Moving loads make a structure gain time-varying mass, stiffness and damping. Analysis of moving-load induced vibration is computationally intensive and its control is difficult. EPSRC has sponsored two project on mine on this topic.

Parametric and nonlinear vibration.
Friction-induced vibration and moving-load induced vibration all belong to parametric vibration. If the law of friction is of a nonsmooth Coulomb type, the vibration is highly nonlinear. Stick-slip vibration and loss of contact can also take place. This kind of vibration is numerically challenging.

Vibration control via eigenstructure assignment:
Vibration reduction (or magnification) can effectively be realised by assigning frequencies/mode to a structure/machine. Various work done includes: passive and active assignment of frequencies and modes, passive partial assignment, pole assignment for stabilising friction-induced vibration.

Vibration-based Structural Identification

Vibration is often used as a way of identifying structural properties. A theoretical model can be corrected via model updating based on measure vibration data. Structural damage can be identified too. Of particular interest are identification of welded joints and bolted joints in assembled structures. These topics belong to challenging inverse dynamics.

Rotor Dynamics

Rotating machines are prone to vibration. Research is going on in passive and active assignment of frequencies and modes to rotating machines for vibration control.

Research Grants

Vibration control and fault detection of complicated systems/structures

ROYAL SOCIETY (CHARITABLE)

April 2006 - March 2008

Moving-load distributions in structural dynamics.

ENGINEERING & PHYSICAL SCIENCES RESEARCH COUNCIL (EPSRC)

June 2006 - May 2009

Linux cluster for structural dynamics research.

ENGINEERING & PHYSICAL SCIENCES RESEARCH COUNCIL (EPSRC)

October 2004 - September 2007

A New Approach to Vibration Mitigation of Moving-load Problems

ENGINEERING & PHYSICAL SCIENCES RESEARCH COUNCIL (EPSRC)

February 2010 - April 2013

Factor 20: reducing CO2 emissions from inland transport by a major modal shift to rail.

ENGINEERING & PHYSICAL SCIENCES RESEARCH COUNCIL (EPSRC)

January 2010 - April 2011

Inverse methods for vibration suppression using structural modifications.

ENGINEERING & PHYSICAL SCIENCES RESEARCH COUNCIL (EPSRC)

October 2001 - September 2004

Frame-structure vibration with joint friction.

ENGINEERING & PHYSICAL SCIENCES RESEARCH COUNCIL (EPSRC)

October 2000 - September 2003

Research Collaborations

Drs Maryam Ghandchi-Tehrani and Yeping Xiong

External: University of Southampton

Dr Marko Tirovic

External: University of Cranfield

brake squeal

Dr Nurulakmar Abu Husain

External: Universiti Teknologi Malaysia

Professors Xinglin Guo and Yahui Zhang

External: Dalian University of Technology

Professor Andrew Day

External: University of Bradford

brake squeal

Professor Jonathan E Cooper

External: The University of Bristol

Professors Zichen Deng and Weipeng Hu, Mr Kai Zhang

External: Northwestern Polytechnical University, China

Professor Kumar Vikram Singh

External: University of Miami

Professors Alberto Trevisani and Dario Richiedei

External: University of Padua

Dr Gabriele Zanardo

External: Johannes Kepler University

Professor Hongyan Wang, Dr Qiang Rui

External: Beijing Institute of Technology

Professor Luis Baeza

External: Universidad Politécnica de Valencia

Dr Fadlur R M Romlay

External: Universiti Malaysia Pahang

Professors Guangxiong Chen, Zhongrong Zhou, Xinsong Jin, Minhao Zhu

External: Southwest Jiaotong University, China

Professor Hongwu Zhang, Mrs Congmin Niu

External: Dalian University of Technology

jointly supervising a PhD student working of vibration and control of cranes

Professor Minjie Wang, Mr Xianguo Han

External: Dalian University of Technology

research collaboration on vibration in turning operations and have joint papers

Professor HU Shaolin

External: Xi'an Jiaotong University

sponsored by the Royal Society of UK and Natural Science Foundation of China

Dr Abdul Rahim Abu Bakar

External: Universiti Teknologi Malaysia

joint research and journal and conference papers

Structural Mechanics

Internal

research into vibration of atomising discs

Dr Yongbin Yuan

External: TRW Automotive

have joint conference and journal papers

Dr Wane Nack

External: General Motor Corporation

have joint journal and conference papers

Dr Frank Chen

External: Ford Motor Company

have joint publications in conference and journal papers and in a book

Professors Yuanxian Gu and Haitian Yang

External: Dalian University of Technology

have had joint publications

Dr Torsten Treyde

External: TRW Automotive

joint research and journal and conference papers, and have grants from TRW

Professor Matthew P Cartmell

External: The University of Glasgow

have had joint publications

Professor Michael I Friswell

External: The University of Bristol

have had joint publications

Dynamics/Professor J E Mottershead

Internal

have had joint publications and grants
have jointly supervised MSc and PhD students