Design and dynamic testing of an instrumented spacecraft component

Details relating to the design and subsequent vibration and shock tests of a spacecraft component for a severe vibration and shock environment are presented. The design process and analysis method involve the use of finite element analysis coupled with the Modal Strain Energy method with risk graphs to determine the adequacy of the design. The vibration levels experienced by box parts are reduced by the application of passive constrained layer viscoelastic treatments that significantly improve component reliability. All significant internal components were fully instrumented in both the random vibration and shock tests, the latter being done on a mechanical impact pyro simulator. Correlation between analysis and test data is good, validating the modeling and analysis techniques

The impacts of new A8 migration in Leeds

New arrivals from Eastern Europe have made regular headlines in the popular press in recent times, not only for the unprecedented magnitude of the flows involved, but also for their impacts – positive and negative – on regions and localities up and down the country. This paper reports on a recently completed research project aimed at finding out more about A8 migrants in Leeds

Secondary stresses in trusses

Structural analysis of fixed joint truss using method of secondary stresses and computer solutio

The experiences of accession 8 migrants in England : motivations, work and agency

Drawing on a recently completed qualitative study in a northern English city, this paper explores motivations and experiences of Accession 8 (A8) migrants who have entered the United Kingdom following the expansion of the European Union in 2004. The paper considers commonalities and differences among the group of migrants routinely referred to as A8 migrant workers/labourers. Diversity is apparent in three particular respects: first, the motivations and forms of movement undertaken; second, their experiences of work within the UK paid labour market; and third, the extent to which the act and experience of migration offers new individual and collective opportunities and potentially opens up spaces for people to negotiate structural constraints and reconfigure aspects of their identity

‘Good relations’ among neighbours and workmates? The everyday encounters of Accession 8 migrants and established communities in urban England

Drawing on data generated in a recently completed qualitative study in a northern, English city, this paper explores the everyday social encounters of Accession 8 (A8) migrants who entered the UK following the expansion of the European Union in 2004. A number of options from permanent residence in another Member State on the one hand, to more fleeting circulatory and multiple short-term moves on the other, now exist for these new European citizens. The relatively short-term and temporary residence of some A8 migrants calls into question the focus of much UK government policy, which emphasises the need for migrants to integrate into diverse yet cohesive communities. Against this backdrop, the aim of this paper is two-fold. First, it considers the somewhat different character of A8 migration (encompassing a spectrum from permanency to temporariness) and what this means for routine experiences of mixing between new migrants and established host communities. Second, the paper explores such interactions in terms of ‘everyday encounters’ in both neighbourhood and work spaces and asks whether such spatio-temporal practices and experiences enhance or inhibit the building of ‘good relations’ in a multicultural city

Wear of a chute in a rice sorting machine

In a rice sorting machine, rice grains drop onto and slide down an anodised aluminium chute. The purpose of the chute is to separate the grains and provide a controlled distribution. At the bottom of the chute the grains are examined optically and contaminants or defective grains are removed from the stream by jets of air. The machine has the ability to sort low quality rice which contains a large element of contaminants such as husk. The husk is extremely abrasive and this, along with other factors, can lead to a reduction in the life of the chute by wear of the surface. In this work a failure analysis process was undertaken to establish the nature and causes of the chute surface wear and the mechanisms of material removal. Wear occurs initially at the location where the grains first strike the chute and at subsequent regions down the chute where bounce occurs. An experimental and analytical examination of the rice motion on impacting the chute was also carried out along with some friction testing of potential replacement chute materials. The evidence gathered during the failure analysis along with the experimental analysis was used to propose possible material/design improvements