Paper of the month
Each month the Department of Mechancial Engineering shines the spotlight on a recently published departmental paper. You will see the content grow on a monthly basis as new papers are published and achievements are recognised within the department.
The Department of Mechanical Engineering ranked in the top 5 UK universities for research excellence in the 2014 Research Excellence Framework (REF).
Combined numerical and experimental biomechanical characterization of soft collagen hydrogel substra
This work presents a combined experimental–numerical framework for the biomechanical characterization of highly hydrated collagen hydrogels, namely with 0.20, 0.30 and 0.40 % (by weight) of collagen concentration. Collagen is the most abundant protein in the extracellular matrix of animals and humans.
Finite difference time domain modelling of sound scattering by the dynamically rough surface of a tu
The problem of scattering of airborne sound by a dynamically rough surface of a turbulent, open channel flow is poorly understood. In this work, a laser-induced fluorescence (LIF) technique is used to capture accurately a representative number of the instantaneous elevations of the dynamically rough surface of 6 turbulent, subcritical flows in a rectangular flume with Reynolds numbers of 10; 800 6 Re 6 47; 300 and Froude numbers of 0:36 6 Fr 6 0:69. The surface elevation data were then used in a finite difference time domain (FDTD) model to predict the directivity pattern of the airborne sound pressure scattered by the dynamically rough flow surface. The predictions obtained with the FDTD model were compared against the sound pressure data measured in the flume and against that obtained with the Kirchhoff approximation. It is shown that the FDTD model agrees with the measured data within 22.3%. The agreement between the FDTD model and stationary phase approximation based on Kirchhoff integral is within 3%. The novelty of this work is in the direct use of the LIF data and FDTD model to predict the directivity pattern of the airborne sound pressure scattered by the flow surface. This work is aimed to inform the design of acoustic instrumentation for non-invasive measurements of hydraulic processes in rivers and in partially filled pipes.
Wear of railroad systems costs millions of dollars around the world. The total annuity cost per meter for rail maintenance of a non-lubricated 12 MGT transportation system is US$ 54, becoming as high as US $ 1.5 Million a year for a 30 km line . The wear of the rail can be divided into that occurring on the gauge and that on the top of the rail. In sharp curves, the wear of the gauge is very important. In tangent track, the wear of the top is more significant. However, in both regions, the most important sources of overall material removal are delamination wear caused by cracks nucleating at the surface and propagating to produce laminar wear debris , and artificial abrasion caused by rail grinding.