共查询到18条相似文献,搜索用时 203 毫秒
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大质量舰用设备一般利用浮动冲击平台进行抗冲击能力评估,但试验过程复杂,费时、费力且花费较多。近些年随着非线性有限元技术的发展,利用有限元法对浮动冲击平台试验仿真考核舰用设备抗冲击性能成为可能。针对浮动冲击平台上舰用设备抗冲击能力进行研究,利用有限元软件ABAQUS进行水下爆炸分析,考虑流固耦合效应,研究浮动冲击平台上的安装设备在不同爆炸距离和不同炸药深度下的冲击响应,为舰用设备特别是大质量设备的抗冲击能力的评估和大型浮动冲击平台的设计提供参考。 相似文献
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由于浮动冲击平台自身结构与实船存在差异,使其在水下爆炸过程中提供给设备的冲击环境较难与实船建立对应关系。为使浮动冲击平台不同工况所得设备抗冲击能力能反应不同排水量舰船及舰船不同位置的设备抗冲击性能,对4艘不同排水量舰船在水中爆炸冲击波作用下垂向滤波效应进行研究;对不同工况下浮动冲击平台与设备连接处的冲击谱参数用Fisher方法与舰船内外底谱参数判别分析,并通过数值仿真验证判别结果的合理性。结果表明,排水量较大船体滤波效应较明显,无上层建筑一甲板较船体内部二、三甲板冲击环境恶劣。通过多元统计分析判别方法建立的实船与浮动冲击平台考核设备冲击环境对应关系,对舰船设备考核具有一定指导意义。 相似文献
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大中型舰载设备的抗冲击考核试验需通过浮动冲击平台进行,而平台的结构形式决定试验能否成功进行。本文对我国尚未起步建设的中型浮动冲击平台进行了结构设计分析。通过非线性双渐近法对平台的响应进行分析,提出了几种浮动冲击平台结构形式,对其强度和冲击环境进行了分析。结果表明:浮动冲击平台的主要响应为刚体运动,外板夹层箱形梁结构形式的平台强度最好,平台内底板提供的冲击环境中谱位移与谱速度与规范较吻合,谱加速度需利用甲板模拟器辅助装置滤波才能与规范较一致。分析成果可为我国用于大中型舰载设备考核的浮动冲击平台建设提供参考。 相似文献
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舰载电子设备是舰船信息化建设的基础,在实际工作环境中,不可避免地会受到水下爆炸冲击作用,如果结构设计不当,将使其受到损害以至失效。从舰船冲击环境和电子设备的抗冲击要求出发,概要性地提出舰载电子设备抗冲击设计的基本原则,指出在电子机柜设计、冲击下工程材料的动态特性及采用隔振器进行抗冲击防护设计三方面的要点,并对采用冲击试验机对舰载电子设备抗冲击能力进行考核时冲击试验机的选择和相关冲击标准进行介绍。 相似文献
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I. A. Rastegaev A. V. Danyuk D. L. Merson A. Yu. Vinogradov 《Inorganic Materials》2017,53(15):1548-1554
The design and the algorithm for the use of an approved universal educational and research facility is described. The facility is designed to simulate a wide range of model controlled objects (vessels, pipelines, tube furnaces, reservoirs, etc.) and the main acoustic emission (AE) sources: cracks, leaks, corrosion damage, sites damaged by an aggressive medium, etc. The AE simulators installed at the facility are equipped with waveguides to provide the acoustic connection and protect the main elements of the facility in case of fracture of the simulators. The AE simulators are controlled using a loading device to preset the fracture initiation point and the simulator fracture rate. The facility is designed so as to provide low-cost repeated simulation of diverse situations that occur during the operation and examination of dangerous industrial objects. The facility can be used for research, education, and certification of personnel, techniques, and AE hardware; thus, it is useful for nondestructive testing laboratories. 相似文献
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S. Y. Nof 《国际生产研究杂志》2013,51(12):3295-3321
The objective of the reported research is to develop a new design-model of distributed facilities, where production is integrated and operates under computer supported collaboration. The main innovation has been the exploitation of the analogy of the highly effective client-server computing environment for the benefit of production facilities design. As a variant of flexible manufacturing systems, the challenge is to manage the distributed material and information flow. The solution approach developed here is by protocols. The goal is to explain the design of the client-server production model and its coordination protocols, including functions of synchronization and resource allocation. An implementation of the model in an assembly and test facility and its application over the last three years serve to explain the model and illustrate its significance. Time-out and priority assignment protocols are defined and analysed in the context of the model to demonstrate its specific benefits. 相似文献
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Consider the production of an evolving family of similar products, each having a well-defined life cycle. The fundamental production resources are inherently flexible, i.e., reconfigurable and reprogrammable. Two distinct strategies can be followed in configuring production facilities: (1) focused facilities, where a facility is dedicated to one product at a time, but may be reassigned; and (2) nonfocused facilities, where setup operations permit a variety of products to be produced during a given planning period. When focused facilities are used, which is a common strategy in some electronics companies, products must be assigned to specific facilities. If facilities are not identical, and capacity is limited, then changing production requirements may force reassignment of products from one facility to another. Thus, the product assignment/reassignment decision may have a significant impact on the production capacity required. This paper concentrates on the product assignment/reassignment decision when a pure focused facility strategy is used. This problem is analyzed and a number of insights are developed. Based on this analysis, the problem is reformulated and an optimal solution procedure based on a multi-commodity network flow model is presented and tested for the product assignment/reassignment decision 相似文献
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文中以宽带和多目标信号为模型,在虚拟仪器开发环境LabWindows/CVI下,设计和开发了基于PXI总线的水下目标模拟器。目标模拟器产生24阵元平面水声基阵的接收信号,在实验室里模拟海洋环境下的目标回波、混响和环境噪声,提供测试水声设备所需的各种目标信号。最后给出了该系统在水声自导系统调试和性能测试应用中的结果。 相似文献
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Scope versus focus: issues of flexibility, capacity, and number of production facilities 总被引:1,自引:0,他引:1
How should a multi-product manufacturing firm design production facilities? How many facilities should it have? How many and which products should be assigned to each facility? What batch sizes/scheduling rules are appropriate for facilities making more than one product? These are questions that have become more relevant now as advances in manufacturing technologies offer an increasing array of equipment choices. In this article, we introduce models that can help operations managers answer the above questions. For a specific product mix, these models lead to explicit expressions for the number of facilities, the number of products assigned to each facility and their corresponding capacities. We evaluate the effect of different operating parameters and scheduling policies on the optimality of different configurations. In particular, we show that the choice of the scheduling and batch sizing policies can have a significant effect on the nature of the optimal mix of flexible and d edicated facilities as well the size of these facilities. 相似文献
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Self-storage warehousing is a rapidly growing industry where consumers or companies can rent storage space for personal or company use, over a certain horizon. This paper addresses the question of how to design the facilities so that revenue can be maximised over a finite horizon, considering multiple demand requirements with respect to size, pricing, location within the facility, climate control, security or outside access, among others. Using a customer choice model to specify the probability of purchase for each fare product as a function of the set of fare products offered, we propose methods to design self-storage warehouses while allowing different customer choice behaviours. We model the problem as a mixed-integer program and solve it using column generation and branch-and-price algorithms. In addition, we study the impact of re-layout and methods to modify facility layout, since self-storage facilities are relatively flexible in layout and individual storage compartments can be adapted to changes in demand. We validate our model using the data of four self-storage warehouses, and show our method can improve the expected revenue by nearly 11% on average for these cases. 相似文献