Model Test Study on Ice-Induced Vibrations of Compliant Multi-Cone Structures

For the study on the ice-induced vibration of a compliant mono-cone structure,a series of model tests were performed from 2004 to 2006.In these tests,the ice sheet before the compliant conical structure was found to be failed in two-time breaking.Based on this important finding,model tests study of the ice force on a compliant multi-cone structure were performed from 2006 to 2007.In these tests,the ice sheet broke before each single cone non-simultaneously.The exciting energy of the total ice force was found to be in a wide range of frequencies,and the structure can be easily excited with nonlinear resonance.

Model Test Study on Ice Induced Vibration of A Compliant Conical Structure

The problem of ice induced vibration is common to ocean engineering of cold region countries. To study the ice induced vibration of a compliant conical structure, a series of model tests have been performed and some breakthrough progresses made. The ice sheet before the compliant conical structure is found to fail by two-time breaking in the tests. The process of two-time breaking behaves in two modes, and the general control of the ice and structural conditions determine the mode in which the ice force would behave. Two dynamic ice force functions are established respectively for the two modes of two-time breaking process in this paper. The numerical simulation results are in good agreement with the measured results, indicating that the dynamic ice force functions given in this paper can fully reflect the real situation of the dynamic ice force on a compliant conical structure.

Establishmen and vertification of an improved similitude law for dynamic ice force model test

To study the similitude laws for dynamic ice force model test which is a hot problem in ice mechanics.In this paper,a new modified similitude law for dynamic ice force model test is proposed based on ice-induced virbration theory and two reasonable assumptions.And the new law is vertified with an ice-induced pier virbration example.The numerical calculation results show that,firstly,the error of frequency factor between test value and theory value is small as well as that of displacement and velocity;Secondly,the time scale completely meet the similitude relation,the waveforms anastomotic well,and the phenomenon of offset and omit do not occur;Thirdly,as the damping ratio between prototype and model is nearly equal,the improved similitude law will still be applied.Therefore,the new modified similitude law is feasible to study dynamic ice force model test and can provide reference for the ice mechanics.

STUDY ON MAXIMUM SPECIFIC SLUDGE ACTIVITY OF DIFFERENT ANAEROBIC GRANULAR SLUDGE BY BATCH TESTS

The maximum specific sludge activity of granular sludge from large scale UASB, IC and Biobed anaerobic reactors were investigated by batch tests. The limitation factors related to maximum specific sludge activity (diffusion, substrate sort, substrate concentration and granular size) were studied. The general principle and procedure for the precise measurement of maximum specific sludge activity were suggested. The potential capacity of loading rate of the IC and Biobed anaerobic reactors were analyzed and compared by use of the batch tests results.

3D Ice Shape Description Method Based on BLSOM Neural Network

When checking the ice shape calculation software,its accuracy is judged based on the proximity between the calculated ice shape and the typical test ice shape.Therefore,determining the typical test ice shape becomes the key task of the icing wind tunnel tests.In the icing wind tunnel test of the tail wing model of a large amphibious aircraft,in order to obtain accurate typical test ice shape,the Romer Absolute Scanner is used to obtain the 3D point cloud data of the ice shape on the tail wing model.Then,the batch-learning self-organizing map(BLSOM)neural network is used to obtain the 2D average ice shape along the model direction based on the 3D point cloud data of the ice shape,while its tolerance band is calculated using the probabilistic statistical method.The results show that the combination of 2D average ice shape and its tolerance band can represent the 3D characteristics of the test ice shape effectively,which can be used as the typical test ice shape for comparative analysis with the calculated ice shape.

Model Test Study of Dynamic Ice Force on Compliant Conical Structures

To study ice-induced vibration of a compliant conical structure, a series of model tests were performed from 2004 to 2005. In the tests, the ice sheet before the compliant conical structure was found to fail in two-time breaking. From 2005 to 2006, this type of ice failure was studied through more groups of tests. The tests show that two-time breaking is the typical failure of ice before steep conical structures, and is controlled by other factors at the same time, such as ice speed and the angle of the cone.

Wind Tunnel Test and Numerical Computation on Ice Accretion on Blade Airfoil for Straight-bladed VAWT

To invest the condition of ice accretion on the blade used for straight-bladed vertical axis wind turbine （SB-VAWT）, wind tunnel tests were carried out on a blade with NACA0015 airfoil by using a small simple icing wind tunnel. Tests were carried out at some typical attack angles under different wind speeds and flow discharges of a water spray with wind. The icing shape and area on blade surface were recorded and measured, Then the numerical computation was carded out to calculate the lift and drag coefficients of the blade before and after ice accretion according to the experiment result, the effect of icing on the aerodynamic characteristics of blade were discussed.

IC-CPD测试系统设计与研究

电动汽车充电模式2属于交流慢充模式,其能够连接传统家用插座和车辆,便于携带,使用灵活。充电模式2必须配备缆上控制与保护装置(IC-CPD)以保证充电安全。在IC-CPD出厂前必须经过严格的测试,以满足安全使用条件。基于IC-CPD测试的重要性,分析了IC-CPD主要功能及内部结构;设计开发了一种能模拟电动汽车充电模式2导引过程,进行CP信号测试和辅助充电网络上继电器关断测试的IC-CPD测试设备;并详细给出了该测试设备的硬件电路设计及与IC-CPD进行测试的具体过程。

Improved significance testing of wavelet power spectrum near data boundaries as applied to polar research

When one applies the wavelet transform to analyze finite-length time series, discontinuities at the data boundaries will distort its wavelet power spectrum in some regions which are defined as a wavelength-dependent cone of influence （COI）. In the COI, significance tests are unreliable. At the same time, as many time series are short and noisy, the COI is a serious limitation in wavelet analysis of time series. In this paper, we will give a method to reduce boundary effects and discover significant frequencies in the COI. After that, we will apply our method to analyze Greenland winter temperature and Baltic sea ice. The new method makes use of line removal and odd extension of the time series. This causes the derivative of the series to be continuous （unlike the case for other padding methods）. This will give the most reasonable padding methodology if the time series being analyzed has red noise characteristics.

附加外循环IC反应器启动试验

在启动期,IC反应器产气量很小,尚不能形成对颗粒污泥的有效搅动,传质过程主要受水力上升流速的控制。由于启动期的IC反应器只能以较低的容积负荷运行,进水流量受到限制,水力上升流速很难达到传质作用的要求,因此IC反应器也像其他类型厌氧装置一样,同样存在着启动周期较长,启动期运行不够稳定的问题。为改善启动期IC反应器的传质作用,本研究对IC反应器进行了改造,增加了外循环装置。通过处理啤酒配水的比较试验,发现在启动期附加外循环可有效强化传质过程,提高IC反应器内的泥水混合程度,大大缩短启动周期。附加外循环IC反应器的整个启动过程只用了26天,比未附加外循环装置的IC反应器缩短了32天。

CMOS IC漏极静态电流测试技术的现状与发展

全面介绍了CMOS集成电路漏极静态电流(IDDQ)测试技术的现状、应用及其发展趋势。与其它主要用于检测逻辑功能的测试技术不同,IDDQ主要用于检测电路的物理缺陷和工艺故障。作为逻辑功能测试的重要补充,IDDQ技术可提高集成电路的可测性和故障覆盖率,保证集成电路的可靠性。

大规模集成电路高温动态老化测试嵌入式图形发生系统的可编程ASIC实现

图形发生系统是大规模集成电路高温动态老化测试的核心子系统。在此 ,采用可编程 ASIC技术成功实现了这一系统。在体系结构及性能指标方面做了很大改进的同时 ,极大地减小了系统的 PCB尺寸 ,首次实现了嵌入方式。

IC测试仪的数据采集及GUI的设计与实现

为了快速精确测量模拟芯片总谐波失真,转换速率等参数指标,设计了一款基于模拟IC测试仪的数据采集系统,模拟信号经过数据采集卡后变成数字信号,根据数字信号进行相关参数的测量,然后将结果通过控制板经过PCI传给上位机,将结果显示在GUI中的Datalog中,硬件方面,测量精度为14位,最低采样频率为10MHz,误差精度小于2%,软件方面,采用多种方式设计AB-MS测试界面的显示,确保界面使用的多样性和便捷。通过实际测试芯片表明系统的设计指标符合项目的要求。

简述IC测试的意义和作用

IC测试技术是有着四十多年历史的一项应用科学技术,其适应整个IC产业的需求在神州大地悄然兴起,展望未来必将促进集成电路测试业的形成和发展,集成电路设计、制造、封装和测试四业并举,使我国集成电路产业健康发展,为信息产业打下坚实的基础。IC测试技术伴随着集成电路的飞速发展而发展,对促进集成电路的进步和广泛应用作出了巨大贡献,各个军工行业的研究院、所、厂都有自己的元器件检测中心,并引进先进的国产、进口各类高性能集成电路测试设备,负责集成电路在军工行业应用的质量把关。随着IC测试成本的不断提高,验证测试成为集成电路制造中的必要环节。

数字IC可测性设计及其EDA流程

介绍了数字IC可测性设计 (DFT)的概念和方法及其在电子设计自动化 (EDA)环境中的实现流程。DFT实质上就是在设计时更改或添加设计结构和模块 ,使之能够满足测试的需要。它的目标包括 :所设计的电路和系统易于测试 ;由此设计所引起的附加硬件应尽可能少 ;电路的附加部分对原来电路的性能影响应尽可能少 ;设计方法的适应面要广。着重介绍了内建自测试DFT、内扫描DFT、边界扫描DFT、IEEEP15 0

IC反应器处理洁霉素废水的启动研究

研究IC反应器处理洁霉素废水的启动特性及处理效果。废水COD的质量浓度为1.9～12.3g/L,BOD5的质量浓度为0.8～5.2g/L,pH值为5.2～6.5,启动研究6个月后,反应器出水COD浓度和pH值没有明显变化,反应器运行十分稳定,启动完成。结果表明,IC反应器处理洁霉素废水COD去除率达到75%左右,出水挥发酸(VFA)的质量浓度在200mg/L以下,pH值保持在6.5～7.5,反应器内部形成具有一定机械强度、沉降性能良好、粒径为1～3mm的颗粒污泥。

数字IC测试仪接口电路的设计

为了保证实验的准确性,针对数字电路实验中IC损坏要进行验证测试的问题,设计了简易数字IC逻辑功能测试仪,着重设计了测试仪接口电路中最关键部分的测试座、芯片的驱动转换电路。

一种高效的混合Test-Per-Clock测试方法

该文提出了一种基于内建自测试(BIST)的Test-Per-Clock混合模式向量产生方法。测试由两个部分组成:自由线性反馈移位寄存器(LFSR)伪随机测试模式和受控LFSR确定型测试模式。伪随机测试模式用于快速地检测伪随机易测故障,减少确定型数据存储。受控LFSR测试模式采用直接存储在ROM中的控制位流对剩余故障产生确定型测试。通过对提出的BIST混合模式测试结构理论分析,提出了伪随机向量的选取方法以及基于受控线性移位确定型测试生成方法。基准电路的仿真结果表明,该方法可以获得完全单固定型故障覆盖率,其测试产生器设计简单且具有良好的稳定性,与其他方法相比,具有较低的测试开销和较短的测试应用时间。

基于ICE中间件的分布式应用开发研究

通过介绍中间件的特点,分析了ICE中间件的架构及主要构成,以地面测试人员获取远端被测设备的系统时间为例,介绍了一种基于ICE中间件的分布式应用程序开发过程与方法,并给出了详细的开发步骤和实现代码。利用该方法,开发人员只需要专注分布式应用逻辑的开发,非常适合航空航天等行业的大型复杂且对性能要求较高的分布式应用开发。