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1.
Chirp浅剖仪在水域地质调查中的应用 总被引:1,自引:0,他引:1
基于线性调频技术的Chirp声学浅剖仪系统,较好地解决了探测深度以及分辨率这两个最令人关心但又互为矛盾的问题。该浅剖仪系统主要由导航系统、信号控制系统、信号发射系统、信号接受系统以及测深系统等5部分组成,理论上,其纵向地层分辨率为十几厘米左右,最大探测深度在百米左右,具体视地层以及水质等条件而定。考虑到该系统的特殊性和复杂性,对其关键操作进行了较为详细的描述。最后介绍了该系统在活断层调查、管线走向调查以及水底抛石调查等不同类型水域岩土工程勘察中的成功应用,表明其具有良好的应用前景。 相似文献
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一种新型双磙子FPS隔振系统的动力学模型 总被引:1,自引:1,他引:0
本文基于多体动力学理论建立了一种新型双磙子FPS(Friction Pendu lum System)隔振系统动力学模型。在对该系统进行运动学分析的基础上,可将它归结为一个单自由度系统。应用非惯性系中质点系相对动能定理的微分形式可推导出该系统的运动微分方程,它是一个非线性方程。在小角位移的情形下,可近似得到相应的无阻尼线性系统的固有频率,它与观测结果吻合。这一双磙子FPS隔振系统的动力学方程的建立有助于对该系统动力学行为的研究,对方程的直接求解可提高仿真设计中正问题计算的效率,为设计包含该系统的半主动控制奠定了基础。 相似文献
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本文首先按照数字地震仪的数据传输方式对地震仪进行了分类(有线遥测地震仪、无线遥测地震仪、无缆存储式地震仪);回顾了无缆存储式地震仪的发展历程,简单分析了无缆存储式地震仪的优点;并对目前国内外的无缆存储式地震仪进行了简单介绍和比较;最后展望了我国发展无缆存储式地震仪的可能性和应用前景.由于无缆存储式地震仪结构相对简单、技术相对成熟,研制开发相对比较容易,非常有利于我国进行自主研发,也是我国石油和天然气行业摆脱地震勘探仪器全部依靠进口的被动局面,在研发数字地震采集系统方面赶上国际水平的有利时机. 相似文献
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巨型框筒部分悬挂结构控制体系地震反应特性及阻尼控制研究 总被引:8,自引:2,他引:8
本文提出巨型框筒部分悬挂结构新体系,研究这种结构体系对地震反应特性,提出用阻尼器进行巨型框筒部分悬挂体系地震反应的控制方法,采用结构动力学有限元方法,建立空间分析模型,对结构体系进行地震随机振动分析、时程分析和地震反应谱分析。分析结果表明,这种结构体系能有效地减小结构的地震响应,最后研究了影响控制效果的主要因素及控制器参数的影响规律。 相似文献
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大庆市东风新村和开发区地震灾害预测与信息管理系统 总被引:1,自引:0,他引:1
近年来,地理信息系统(GIS)技术被广泛地应用于城市或区域的防震减灾信息管理系统的建设。本文着重论述了在完成大庆市东风新村和开发区的震害预测工作,依据丰富的现场调查资料和震害预测信息建立了大庆市东风新村和开发区地震灾害预测与信息管理系统,以及建成后的系统所包含的主要内容和所能实现的功能。应用GIS技术建设城市地震灾害预测与信息管理系统不但能在地震应急决策中起到辅助决策作用,而且对于日常城市管理也是十分方便的。该系统的开发对其它城市防灾系统建设有一定的借鉴意义。 相似文献
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MRFD半主动控制系统的时滞与补偿 总被引:7,自引:0,他引:7
时滞与补偿是基于磁流变流体阻尼器(Magnetorheological Fluid Damper,简称MRFD)的半主动控制系统优化设计中的一个重要问题。本文对此进行了研究,并通过计算实例分析了时间滞后与补偿两种情况对控制系统性能的影响,结果表明,当时滞达到1.0s时,MRFD半主动控制系统仍具有一定的控制效果,说明该半主动控制系统是可靠的,其性能要优于完全主动控制系统,并且对时滞补偿以后系统的控制效果得到明显的改善,说明本文所述的时滞补偿方法是有效的。 相似文献
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Jian Hua Li Zheng Ping Zhang Rui Huan Jing Chong Fu Huang 《Stochastic Environmental Research and Risk Assessment (SERRA)》2009,23(4):485-492
In this paper, we introduce a value chain approach, on the view of the value chain analytic in business management, to be
the framework of a crisis response system serving for crisis management strategy in identifying risk sources, responding to
unexpected events, and recovering from a shock. This system is not only a computer system but also a system of governmental
emergency response mechanism and it is tremendous and complex. The system integrates and coordinates the correlative resources
of emergency response units of the city. We consider the efficiency of the system. In addition, the run cost of the system
also is taken into account. Based on this framework, the Qingdao’s practical situation is analyzed. As a result, a design
proposal of the Qingdao’s crisis response system is put forward. 相似文献
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Taking Huanglong Ravine and Kangding, Sichuan, and Xiage, Zhongdian, Yunnan, as examples, the authors summarize the hydrogeochemical and carbon stable isotopic features of the geothermal CO2-water-carbonate rock system and analyze the CO2 sources of the system. It was found that the hydrogeochemical and carbon stable isotopic features of such a system are different from those of shallow CO2-water-carbonate rock system, which is strongly influenced by biosphere. The former has higher CO2 partial pressure, and is rich in heavy carbon stable isotope. In addition, such a geothermal system is also different from that developed in igneous rock. The water in the latter system lacks Ca2+, and thus, there are few tufa deposits on ground surface, but it is rich in light carbon stable isotope. Further analysis shows that CO2 of the geothermal CO2-water-carbonate rock system is a mixture of metamorphic CO2 and magmatic CO2. 相似文献
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山东荣成湾月湖地区的潟湖-潮汐汊道体系 总被引:7,自引:0,他引:7
泻湖-潮汐汊道体系为一复杂的反馈体系,其中任一参数的改变即可导致整个体系的复杂反映。以月湖为例探讨了泻湖地貌演化的过各,及人工作用泻湖各主要参数的变化规律;提出了月湖目前由于人工署堵特别是残余坝基对潮流的限制作用,致使P/A值较高而饱满系数K值偏代,泻湖-潮汐汊道体系稳定性较差的问题。 相似文献
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全国地震应急视频会议系统建设及应用 总被引:4,自引:2,他引:2
地震应急体系随着国家"十五"重大项目"中国数字地震观测网络"项目的验收初步确立,应急指挥系统建设逐步完善,视频会议系统在地震应急响应中发挥了日益重要的作用。本文简要介绍了视频会议系统的基本组成和关键技术,详细阐述了全国地震应急视频会议系统的网络拓扑结构、主要功能以及在地震应急中的实际应用情况。本文对将来地震应急视频会议应用模式的流程化、规范化有一定实际意义。 相似文献
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无人机地震灾情监测系统主要由无人机飞行平台、飞行控制系统、遥感系统、软件系统和无线电遥控系统等几部分组成,具有运行成本低、执行任务灵活性高等特点,是快速获取震后灾情信息的重要手段。结合四川高原山区的自然地理和气象条件,对无人机地震灾情监测系统在四川高原山区的应用进行了研究。该系统在高原山区的应用将在提升地震灾情现场勘查能力,迅速获取灾情信息,增加救灾工作的时效性,及为后期科学考察提供辅助信息等方面提供重要的技术支撑。 相似文献
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Introduction The lifeline interaction is the mutual effect between a lifeline system and other lifelinesystems in the same district under seismic conditions. In other words, the reliability of a lifelinesystem, in addition to system oneself earthquake resistant performance, still depends on the reliability of other lifeline system which have functional connections or physical proximity with the lifeline system. For example, the function of water supply system also relies on the function of pow… 相似文献
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This research aims to develop a unified wireless control system which would successfully control the vibration of bridges, and also to evaluate its performance. In this unified wireless control system, a wireless measurement control system is developed independently from the central system, and it controls the structure by feedback on the basis of the measured signals transmitted from the control device. Also this independent control system wirelessly monitors the general performance of the control device on the site and reports to the central control system. Embedded with control algorithm and made into a system with the control device, it continuously controls the vibration by feedback. Since this independently made wireless measurement-control system does not have enough memory space for effective control, all signals can be made to communicate wirelessly with the central control system which has more memory space. When needed, a user can directly intervene in the control process. When the possible disconnection of wires due to earthquake or some other disasters can cause troubles in data transmission or power supply, the wireless control system can safely perform its function. The performance of this unified wireless control system is evaluated in comparison to a wired control system by means of vibration control experiments on bridges. In these experiments, a semi-active control method is selected, and all outputs are quantitatively compared and evaluated. As a result, this unified wireless control system with a central control system is proved to be effective for vibration control and also overcome the shortcomings of the wired system. 相似文献
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Dynamic response behaviour of a simple torsionally coupled system with Multiple-Tuned Mass dampers (MTMDs) is investigated. The system is subjected to lateral excitation that is modelled as a broad-band stationary random process. MTMDs with uniformly distributed frequencies are considered for this purpose and they are arranged in a row covering the width of the system. A parametric study is conducted to investigate the effectiveness of MTMDs on reducing the response of torsionally coupled system. The parameters include the eccentricity of the main system, its uncoupled torsional to lateral frequency ratio and the damping of MTMDs. It is shown that the effectiveness of MTMDs in controlling the lateral response of the torsionally coupled system decreases with the increase in the degree of asymmetry. Further, the effectiveness of MTMDs, designed for an asymmetric system by ignoring the effect of the torsional coupling, is overestimated. © 1997 by John Wiley & Sons, Ltd. 相似文献
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On deposits controlled by tectonic lenses 总被引:1,自引:0,他引:1
WANG Jincao XIA Bin & JI Shaocheng .Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou China .Department of Civil Geological Mining Engineering Montreal Institute of Technology P.O.Box Station Centre-ville Montreal Canada 《中国科学D辑(英文版)》2004,47(12):1095-1101
Tectonic lenses (e.g., boudinage structures,pinch-and-swell structures) are common geologicalstructures observed in various scales ranging fromseveral hundreds of kilometers (e.g., lenticular terranesor massifs) in orogenic belts to a few millimeters (e.g.,core-mantle structures and porphyroclasts) in petro-graphic thin-sections. The most frequently observedtectonic lenses are those developed in metamorphicrocks where compositional layers with distinctrheological strengths coexist. No matter h… 相似文献
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山东地震台网“十五”与“九五”期间地震定位方法对比研究 总被引:7,自引:6,他引:1
应用山东地震台网数据,对比研究山东台网“十五”与“九五”期间地震定位参数,初步认为:山东台网“十五”期间定位与“九五”期间定位参数基本一致,“十五”期间中单纯型法定位适用于网内、网缘和网外所有近震和远震,是“十五”期间中最好用的一种定位方法。 相似文献