Dr Hassan Jalali

Assistant Professor

School: Engineering, Physics and Mathematics

I specialise in structural dynamics, with a focus on understanding the linear and nonlinear behaviour of bolted joints and frictional contact interfaces through experimental data. The dynamic behaviour of these interfaces is influenced by numerous parameters, making it difficult to develop comprehensive models that capture all critical factors. Direct measurement and monitoring of contact mechanisms within joint interfaces are not feasible, and the inherent uncertainty in bolted joint contact interfaces often results in significant variability in a structure's dynamic properties. My research aims to create accurate and predictive mathematical models to represent the complex nonlinear mechanisms at these contact points. Numerical simulations involving structures with multiple joints can be time-consuming due to the pronounced nonlinearity of frictional behaviour. Therefore, I focus on developing simplified yet accurate equivalent models for frictional contact interfaces. These models improve the precision of dynamic analyses while reducing computation time, making them highly effective for simulating real-world structural behaviour.

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Research Themes and Scholarly Interests

Structural dynamics

Inverse problems in vibration

Improvement of finite element models using experimental data

Modelling and identification of nonlinear mechanical joints

Frictional contact interface modelling

Uncertainty quantification in structural dynamics

Dynamics of rotating machinery

Machining vibration

Key Publications

Harmonic-Balance-Based parameter estimation of nonlinear structures in the presence of Multi-Harmonic response and force, Taghipour, J., Haddad Khodaparast, H., Friswell, M., Shaw, A., Jalali, H., Jamia, N. 1 Jan 2022, In: Mechanical Systems and Signal Processing
An equivalent model of a nonlinear bolted flange joint, Jamia, N., Jalali, H., Taghipour, J., Friswell, M., Khodaparast, H. 15 May 2021, In: Mechanical Systems and Signal Processing
Stochastic modelling and updating of a joint contact interface, Jalali, H., Haddad Khodaparast, H., Madinei, H., Friswell, M. 15 Aug 2019, In: Mechanical Systems and Signal Processing
The effect of preload and surface roughness quality on linear joint model parameters, Jalali, H., Khodaparast, H., Friswell, M. 12 May 2019, In: Journal of Sound and Vibration
A modal-energy based equivalent lumped model for open cracks, Jalali, H., Noohi, F. 1 Jan 2018, In: Mechanical Systems and Signal Processing
Linear contact interface parameter identification using dynamic characteristic equation, Jalali, H. 1 Jan 2016, In: Mechanical Systems and Signal Processing
Micro/macro-slip damping in beams with frictional contact interface, Asadi, K., Ahmadian, H., Jalali, H. 8 Oct 2012, In: Journal of Sound and Vibration
Identification of micro-vibro-impacts at boundary condition of a nonlinear beam, Jalali, H., Ahmadian, H., Pourahmadian, F. 1 Apr 2011, In: Mechanical Systems and Signal Processing
Nonlinear model identification of a frictional contact support, Ahmadian, H., Jalali, H., Pourahmadian, F. 1 Nov 2010, In: Mechanical Systems and Signal Processing
Identification of nonlinear bolted lap-joint parameters by force-state mapping, Jalali, H., Ahmadian, H., Mottershead, J. 15 Dec 2007, In: International Journal of Solids and Structures

PGR Supervision

Dylan Brown Modelling and Experimental Analysis of Bolted Joint Dynamics Start Date: 01/10/2024
Dylan Brown Modelling and Experimental Analysis of Bolted Joint Dynamics Start Date: 01/10/2024 End Date: 17/10/2025