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This paper is to aim at discussing the design depth(the maximum water head of filtration), the checking purpose, content and method of the siphonic filters through the analysis of the relation between the siphonic filter's depth and its rate of filtration, and an explanation of a few kinds of the rate of filtration and a discussion of the selection of the design rate of filtration are also included. Besides, it demonstrates the inner links of the current experimental data or parameters, such as the... This paper is to aim at discussing the design depth(the maximum water head of filtration), the checking purpose, content and method of the siphonic filters through the analysis of the relation between the siphonic filter's depth and its rate of filtration, and an explanation of a few kinds of the rate of filtration and a discussion of the selection of the design rate of filtration are also included. Besides, it demonstrates the inner links of the current experimental data or parameters, such as the filter's design rate, the washing head, the maximum filtrating head, and so on. 本文试图通过对虹吸滤池高度(着重在最大过滤水头)与滤速之间关系的分析,对几种滤速概念的阐述,以及对设计滤速选择问题的讨论,以探讨虹吸滤池设计高度(最大过滤水头)校核的目的、内容和方法,同时对现行的一些经验数据或参数(如设计滤速、冲洗水头、最大过滤水头等)之间的内在关系进行了阐述和论证。 This paper introduced the measurements of material dynamic characteristics of Liu Jia Xia Dam made by using wave-velocity method. The values of the characteristic parameters E, G and μ of several kinds of composite materials of the Dam were measured. In order to confirm the reliability of the measurement values of the material dynamic characteristics of the Dam, the calculations of the frequency of free vibrations of the Dam were made by means of direct frequeucy-filtering method with the measured data... This paper introduced the measurements of material dynamic characteristics of Liu Jia Xia Dam made by using wave-velocity method. The values of the characteristic parameters E, G and μ of several kinds of composite materials of the Dam were measured. In order to confirm the reliability of the measurement values of the material dynamic characteristics of the Dam, the calculations of the frequency of free vibrations of the Dam were made by means of direct frequeucy-filtering method with the measured data and the results were also compared with that of the measured values. The results show that they are in good agreement with each other. 本文介绍了运用波速法对刘家峡大坝材料动力特性所进行的现场测试,测定了该坝几种组成材料的特性参数(即E、G、μ)值。为了论证对坝体材料动力特性测试值的可靠性,还以现场测试数据用“直接滤频法”计算了坝体的自振特性,并与现场测试自振特性进行了比较,结果相当一致。 In this paper, The Kalman's filtering method is used for the first time in cable stayed bridge construction to treat the problem of the inconsistancy of erection deflection and cable forces with design values. The nature of the method is a kind of automatic control. From the data obtained through actual measurements, the approximate adjusting values of the cable tensioning force can be evaluated step by step, so as to adhere to the design assumption of continuous girders with rigid supports and to achieve... In this paper, The Kalman's filtering method is used for the first time in cable stayed bridge construction to treat the problem of the inconsistancy of erection deflection and cable forces with design values. The nature of the method is a kind of automatic control. From the data obtained through actual measurements, the approximate adjusting values of the cable tensioning force can be evaluated step by step, so as to adhere to the design assumption of continuous girders with rigid supports and to achieve the desired deflections and cable internal forces in the final stage. This method was used on the Maogang River Bridge construction, resulting in a final deflection differ ing by 2cm from the design value. 本文首次应用卡尔曼滤波法处理在斜拉桥结构施工中挠度和索力与设计不一致的困难问题。此法特点是逐步通过实际测量数据算出索拉力的调整值,以满足刚性支承连续梁的设计要求,并在最后阶段达到所要求的挠度及内力状态。泖港大桥应用此法进行控制,其最终挠度与设计值仅差2厘米。
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