Characterisation of frictional behaviour at brick-mortar interface

Unreinforced Masonry, a popular construction material with a rich historical legacy, has been resilient through centuries, despite its susceptibility to failure through various loading conditions such as seismic forces. Understanding the mechanical behaviour of masonry, particularly the cohesion and frictional mechanisms at interfaces between...

The Design of a Flexible Damper For Passive Energy-Dissipation in Assistive Devices

Energy dissipation plays a crucial role in mitigating noise and vibration in a wide range of applications. In the field of assistive devices, energy dissipation is used to improve the stability of joint motion and protect the musculoskeletal system from excessive loads. It is not surprising that considerable effort has gone into developing...

Effects of contact materials on friction damping performance

Friction damping is common in engineering structures for the purpose of energy dissipation and vibration control. Examples of applications are bolted connections and earthquake isolation systems. However, there is a shortage of works that investigate the effects of different contact materials on the energy dissipation performance and friction...

Rail Wear in Curves at the Tramway of Amsterdam

Rail wear in curves at the tramway of Amsterdam is a considerable problem since it consumes a significant part of the maintenance budget. The wear mechanism is not fully understood because some curves could suffer much more than others, while the cause for the difference is unknown. GVB, the public transport operator of Amsterdam, wants to...

Investigating energy dissipation for a methodology to fatigue master curves

Energy dissipation response of a rectangular metal tube on axial impact

A surrogate model is used to predict the energy dissipation response for a rectangular beam, initiated by an axial impact. This method is used for one type of steel, after which a generalization is performed to make it available for multiple types of metal.

Wave damping by dynamic breakwaters: Modelling and experiments

A new and innovative idea to reduce the wave reflection in front of vertical walls is by means of dynamic breakwaters, which dissipate wave energy by using moving elements. These moving elements in combination with a spring and a 'dashpor' to dissipate energy reduce the wave reflection in a wide range offrequencies (see Figure 2-1, 2-2 for...

Transformation of wave spectra across the surf zone

One of the most applied models for wave prediction is the spectral wave model SWAN. SWAN is not always capable of predicting wave conditions in the surf zone with sufficient accuracy. In this study the transformation of wave spectra across the surf zone and its spectral modelling was investigated. The objective of this thesis work was to improve...

Wave damping characteristics of dynamic breakwaters

New developments in the design of off-shore harbours, involving land reclamation and the use of large vessels (draughts larger than 10 meter) have made it necessary for breakwaters to be constructed in deeper water. In deep water, vertical caisson breakwaters have been found to provide better economical solutions than rubble mound breakwaters,...

Energy dissipation in random breaking waves: The probability of breaking

The present wave transformation models for random waves make use of an explicit formulation of the energy dissipation. A time-averaged model has been studied in which the dissipation rate per breaking wave is estimated from that in a bore of corresponding height. The probability of occurrence of breaking is derived from a wave height...

Golfhoogteverlaging in het Ekofisk veld: Een alternatief voor de platform jack-up. Deel II

Deel II bevat het derde deelverslag uit maart 1988 waarin de dynamische golfbreker constructief wordt uitgewerkt. En waarin ook een kostenschatting van de dynamische golfbreker in het Ekofisk veld is gemaakt. De dynamische golfbreker is een golfdempingssysteem bestaande uit een groot aantal boeien die onder het zeeoppervlak verankerd worden, en...

Energieverloop en golfopstuwing bij brekende onregelmatige golven: Metingen en berekeningen

A description is given of a model developed for the prediction of the dissipation of energy in random waves breaking on a beach. The dissipation rate per breaking wave is estimated from that in a bore of corresponding height, while the probability of occurrence of breaking waves is estimated on the basis of a wave height distribution with an...