Dr Joshua Meggitt's Outputs (29)

A dynamic stiffness method to estimate the sound insulation of an arbitrarily installed thick cross laminated timber (CLT) plate (2024)
Presentation / Conference Contribution

There is no generally accepted standard methodology to determine the dynamic constants of whole cross laminated timber (CLT) plates. Combined with the observation that CLT walls or floors are installed in situ under very different conditions to labor... Read More about A dynamic stiffness method to estimate the sound insulation of an arbitrarily installed thick cross laminated timber (CLT) plate.

On the limitations of transmissibility functions for damage localisation: the influence of completeness (2024)
Journal Article
Meggitt, J. W., & McGee, R. C. (in press). On the limitations of transmissibility functions for damage localisation: the influence of completeness. Structural Health Monitoring, https://doi.org/10.1177/14759217241226602

Transmissibility functions are used to identify and locate damage in critical structures for health monitoring purposes. Their appeal over conventional signal or frequency response-based functions lie in a unique property; sub-structural invariance.... Read More about On the limitations of transmissibility functions for damage localisation: the influence of completeness.

Applications of a hybrid method to a plate with simply supported boundary conditions (2023)
Presentation / Conference Contribution

* The EN12354 building acoustics prediction standards are based on the statistical energy analysis (SEA) method. In a traditional SEA path analysis, lightweight or heavyweight materials have different principal paths that determine the sound insulati... Read More about Applications of a hybrid method to a plate with simply supported boundary conditions.

Power flow sensitivity analysis for optimal structural modification (2023)
Journal Article
Meggitt, J. (2023). Power flow sensitivity analysis for optimal structural modification. Applied Acoustics, 211, Article 109463. https://doi.org/10.1016/j.apacoust.2023.109463

Across many industries there is a need to develop products with improved vibro-acoustic performance. Whether the aim is to reduce the radiated sound level in a vehicle cabin, or to minimise the vibration level of sensitive components, the problem may... Read More about Power flow sensitivity analysis for optimal structural modification.

Interval sensitivity analysis of joint dynamics in complex built-up structures (2022)
Journal Article

The dynamic properties of joints, or inter-component connections, are a principal source of uncertainty when modelling complex built-up structures. In the present paper, we propose an interval-based sensitivity analysis (SA) to establish the contribu... Read More about Interval sensitivity analysis of joint dynamics in complex built-up structures.

Interval-based identification of response-critical joints: A tool for model refinement (2022)
Journal Article
Meggitt, J. (2022). Interval-based identification of response-critical joints: A tool for model refinement. Journal of Sound and Vibration, 529, https://doi.org/10.1016/j.jsv.2022.116850

To accurately model the dynamics of a complex built-up structure it is often necessary to forgo the assumption of ideal rigid coupling between components. The dynamic behaviour of inter-component connections, or joints, can have a significant impact... Read More about Interval-based identification of response-critical joints: A tool for model refinement.

Noisy neighbours : towards a hybrid prediction and testing process for sound insulating partitions (2021)
Presentation / Conference Contribution

There are numerous methods for characterising sound insulating and impact noise reducing components and systems, each with their own advantages and disadvantages. Two of the predominant modelling techniques for prediction of transmission loss through... Read More about Noisy neighbours : towards a hybrid prediction and testing process for sound insulating partitions.

Fast transfer path analysis using controlled electric motors as in-situ blocked force vibration sources (2021)
Thesis

Under certain driving and road conditions, steering manoeuvres may provoke audible noise inside the vehicle compartment induced by the electric power steering (EPS) system. Regarding noise, vibration and harshness (NVH), engineers require practical t... Read More about Fast transfer path analysis using controlled electric motors as in-situ blocked force vibration sources.

Generalised round-trip identity — for the determination of structural dynamic properties at locations inaccessible or too distant for direct measurement (2021)
Journal Article
Wienen, K., Sturm, M., Moorhouse, A., & Meggitt, J. (2021). Generalised round-trip identity — for the determination of structural dynamic properties at locations inaccessible or too distant for direct measurement. Journal of Sound and Vibration, 511, 116325. https://doi.org/10.1016/j.jsv.2021.116325

In noise and vibration engineering, a structure’s passive dynamic properties are often quantified by frequency response functions (FRFs). This paper focuses on acquiring FRFs from experimental tests, considering both, translational (x, y, z) and rota... Read More about Generalised round-trip identity — for the determination of structural dynamic properties at locations inaccessible or too distant for direct measurement.

Vibro-acoustic analysis of a domestic product based on experimental measurement and hybrid modelling (2021)
Journal Article

The purpose of this paper is to present a case study whereby a hybrid experimental-numerical model is used to analyse the structureborne
radiation from a domestic product (vacuum cleaner head). The passive (including radiative) properties of the str... Read More about Vibro-acoustic analysis of a domestic product based on experimental measurement and hybrid modelling.

Component replacement TPA : a transmissibility-based structural modification method for in-situ transfer path analysis (2021)
Journal Article

In-situ Transfer Path Analysis is a diagnostic method used to analyse the propagation of noise and vibration through
complex built-up structures. Its defining feature is the invariant characterisation of an assembly’s active components
(i.e. vibrat... Read More about Component replacement TPA : a transmissibility-based structural modification method for in-situ transfer path analysis.

An experimental exploration of the properties of random frequency response functions (2020)
Journal Article
Clot, A., Meggitt, J., Langley, R., Elliott, A., & Moorhouse, A. (2021). An experimental exploration of the properties of random frequency response functions. Journal of Sound and Vibration, 491, 115773. https://doi.org/10.1016/j.jsv.2020.115773

The vibro-acoustic analysis of complex structures over a broadband frequency range is an extremely challenging problem that may often require the use of a hybrid deterministic-statistical approach. Due to manufacturing imperfections, the frequency re... Read More about An experimental exploration of the properties of random frequency response functions.

Finite element model updating using in-situ experimental data (2020)
Journal Article

Conventional model updating methods are based on frequency response functions (FRFs) and/or modal parameters
estimates obtained from freely suspended, or sometimes rigidly constrained, sub-structures. These idealised boundary
conditions are however... Read More about Finite element model updating using in-situ experimental data.

A framework for the propagation of uncertainty in Transfer Path Analysis (2020)
Journal Article

Transfer Path Analysis (TPA) is a test-based methodology used to analyse the propagation of noise and vibration
in complex systems. In this paper we present a covariance based framework for the propagation of experimental
uncertainty in classical,... Read More about A framework for the propagation of uncertainty in Transfer Path Analysis.

On the completeness of interface descriptions and the consistency of blocked forces obtained in-situ (2020)
Journal Article

Blocked forces can be used to describe, independently, the operational characteristics of a vibratory source. Their use
within a computational model avoids the need to represent explicitly the complex mechanisms that lead to vibratory
excitation. T... Read More about On the completeness of interface descriptions and the consistency of blocked forces obtained in-situ.

A covariance based framework for the propagation of correlated uncertainty in frequency based dynamic sub-structuring (2019)
Journal Article
Meggitt, J., & Moorhouse, A. (2020). A covariance based framework for the propagation of correlated uncertainty in frequency based dynamic sub-structuring. Mechanical Systems and Signal Processing, 136, 106505. https://doi.org/10.1016/j.ymssp.2019.106505

Dynamic sub-structuring (DS) is the procedure by which the passive properties (i.e. frequency response functions)
of an assembled structure are predicted from those of its constituent sub-structures. In this paper we are concerned
with the propagat... Read More about A covariance based framework for the propagation of correlated uncertainty in frequency based dynamic sub-structuring.

Evaluation of uncertainties in classical and component (blocked force) transfer path analysis (TPA) (2019)
Journal Article

Transfer path analysis (TPA) has become a widely used diagnostic technique in the automotive and other sectors. In classic TPA, a two-stage measurement is conducted including operational and frequency response function (FRF) phases from which the con... Read More about Evaluation of uncertainties in classical and component (blocked force) transfer path analysis (TPA).

Robust NVH engineering using experimental methods - source characterization techniques for component Transfer Path Analysis and Virtual Acoustic Prototyping (2019)
Journal Article

A major challenge in automotive NVH engineering is to approach complex structure-borne sound and vibration problems with sufficient accuracy but reasonable experimental effort. Typical issues encountered are poor correlation between objective compone... Read More about Robust NVH engineering using experimental methods - source characterization techniques for component Transfer Path Analysis and Virtual Acoustic Prototyping.

Development of a hybrid FE-SEA-experimental model (2019)
Journal Article
Clot, A., Meggitt, J., Langley, R., Elliott, A., & Moorhouse, A. (2019). Development of a hybrid FE-SEA-experimental model. Journal of Sound and Vibration, 452(Jul 19), 112-131. https://doi.org/10.1016/j.jsv.2019.03.027

The vibro-acoustic response of complex structures with uncertain properties is a problem of great concern for modern industries. In recent years, much research has been devoted to the prediction of this response in the mid-frequency range where, beca... Read More about Development of a hybrid FE-SEA-experimental model.

A covariance based framework for the propagation of uncertainty through inverse problems with an application to force identification (2019)
Journal Article
Meggitt, J., Moorhouse, A., & Elliott, A. (2019). A covariance based framework for the propagation of uncertainty through inverse problems with an application to force identification. Mechanical Systems and Signal Processing, 124, 275-297. https://doi.org/10.1016/j.ymssp.2018.11.038

Inverse problems are widely encountered in fields as diverse as physics, geophysics, engineering and finance.
In the present paper, a covariance based framework for the estimation of their uncertainty is presented and applied to the problem of inve... Read More about A covariance based framework for the propagation of uncertainty through inverse problems with an application to force identification.