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This paper presents the numerical research on the collapse failure of dented subsea pipelines under bending moment and external pressure. Firstly, the case of pure bending moment is studied and shows that the increase of initial denting displacement and ratio of diameter to thickness leads to decreased critical moment. Then the external pressure is imposed, and it is concluded that the non-dimensionalized...
In this work, collapse of subsea pipelines subjected to external pressure which are dented by foreign objects is investigated through numerical method. The effect of diameter-to-thickness ratio D/t and ovalization caused by denting Δom on the collapse pressure is discussed. Of particular concern is the effect of indenter's shape on the collapse pressure. The collapse behavior between pipelines dented...
Subsea pipelines are essential equipment in ocean engineering. The development of oceanic exploitation of subsea oil and nature gas has gone into deeper and deeper areas and sandwich pipelines (SPs) are required in this area. In this paper, the effect of local corrosion on the collapse pressure of SPs is investigated through comprehensive finite element analysis. It can be found that the elastic bifurcation...
Extensive use of dynamic instruction scheduling technique has made it an essential content of Computer Architecture (CA) course. Practical teaching for this content, however, is always a weak link in the teaching of CA. According to current teaching methods, teachers just explain the principle of dynamic instruction scheduling by traditional or multimedia instruction. This kind of method is far from...
Pipeline requires both low latency and high throughput. Synchronous pipeline achieves a near optimized throughput but suffers from the worst-case computation delay. Meanwhile, asynchronous pipeline keeps an optimized computation delay but suffers from the low throughput. In this paper, we present dual control path (DCP), a new structure of four-phase handshake asynchronous control path, to improve...
Binary64 arithmetic is rapidly becoming inadequate to cope with today's large-scale computations due to an accumulation of errors. Therefore, binary128 arithmetic is now required to increase the accuracy and reliability of these computations. At the same time, an obvious trend emerging in modern processors is to extend their instruction sets by allowing single instruction multiple data (SIMD) execution,...
Single-instruction-multiple-data (SIMD) devices have been widely incorporated into baseline instruction level parallelism (ILP) processors to enable more efficient data level parallelism (DLP) support. This paper addresses the unsolved problem of the need to permute the SIMD elements packed in registers for maximum parallelism performance. An implicit data permutation (IDP) mechanism is proposed for...
SIMD devices have gained widespread acceptance in modern microprocessor designs for their superior performance for multimedia applications. However, there are three remaining limitations to the efficient utilization of SIMD devices in general-purpose computer systems: memory alignment, data reorganization and control flow. This paper presents SIF, an efficient SIMD interface framework that addresses...
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