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frequency sweep
    Digital Realization Method of Frequency Sweep Signal
    频率扫描信号的一种数字实现方法
    The direct digital synthesizing frequency sweep signal system based on the technique of ISP
    基于ISP技术的数字频率扫描信号发生系统
    The results show that the three gluten proteins respectively exhibit the critical stresses of 49.59,24.88 and 12.48Pa during the stress sweep,the elastic moduli of 1194,789 and 583Pa during the frequency sweep with a sweeping frequency of 1.117rad/s,and the deformations of 7.09%,9.43% and 14.29% during the creep and recovery sweep with a sweeping period of 5.11min.
    频率扫描时,当频率为1.117 rad/s时它们的弹性模量分别为1194,789和583 Pa; 蠕变-恢复实验时,当时间为5.11m in时它们的形变分别为7.09%,9.43%和14.29%.
    Small Amplitude Oscillation Frequency Sweep of Lamellar Liquid Crystal
    层状液晶的小振幅振荡频率扫描研究
    In SBR filled with CB, the effects of filler content and the addition of additive on dynamic viscoelasticity were investigated through strain sweep, temperature sweep and frequency sweep.
    在CB填充SBR体系中,通过动态应变扫描、温度扫描、频率扫描等方式,主要研究了CB用量、配合剂等对混炼胶中网络结构及其动态粘弹性的影响。 由于CB和SBR有好的界面作用,温度扫描中随温度的上升模量随之降低。
    For example, improvement of the Gaussian noise generator and implement of the frequency sweep function are given.
    例如,高斯噪声生成方法的改进,信道模拟器多普勒频率扫描功能的实现。
    Bisphenol A epoxy resin was emulsified to be waterborne system by incomplete phase inversion technique at low concentration of the emulsifier (2 33wt%),and both stress sweep and dynamic frequency sweep tests were performed to characterize the rheological behavior of the system during phase inversion evolution. It is shown that the system is a Newtonian fluid with an almost constant viscosity independent on stress before the phase inversion point.
    以动态应力流变仪DSR(DynamicStresRheometer)对双酚A型环氧树脂在低乳化剂浓度(233wt%)下的相反转乳化过程进行了稳态应力扫描及动态频率扫描实验.实验结果表明,体系在相反转点前表现为牛顿流体行为,粘度几乎不变;
    Furthermore, basic element determining open /close loop system frequency response by using frequency sweep technique, involved in a variety of methods, is fully verified to be correct, through both manual and automatic frequency sweep at different input position in the control loop with BW 1 variable stability aircraft. So that the various methods of measuring stability margin are ensured to be effective and feasible.
    并就各种方法的基本环节——频率扫描确定开环/闭环系统频率响应的具体方法,通过BW-1变稳机人工手动扫频和试验信号发生器不同位置扫频激励试飞进行了验证,结果是正确的,从而确保了各种测取稳定裕度方法的有效可行。
    A novel method of direct digital synthesizing frequency sweep signal is presented.
    介绍了利用直接数字合成技术产生频率扫描信号的新方法。
    Frequency sweep signal sequence is generated from waveform memories added by counter and phase accumulator.
    利用计数器和相位累加器实现对波形存储器寻址 ,从而产生频率扫描信号序列。
    In the strain sweep experiment, it was found that the critical strain applied to this waste liquor polymer solution was up to 0.05. In the linear viscoelastic region, the frequency sweep measurement results showed that the waste liquor polymer solution has viscoelasticity. Increasing solids contents and raising temperatures can give birth to high complex modulus G * and then results in strong yield stress and marked viscoelasticity.
    应变扫描实验得出甘蔗渣浆废液多聚物的临界应变达到0.05.在线性粘弹性范围内,频率扫描试验得出:甘蔗渣浆废液多聚物是具有一定粘弹性的粘弹体,增加固含量和提高温度都会提高复合模量G*,粘弹性更突出.
    Using the dynamic stress rfieometer, we perform experiments upon polypropylenes(PP2401) and co-polypropylenes( PP1330) that produced by 841-catalyst and TK-catalyst. The experiments are dynamic stress sweep, dynamic frequency sweep and steady-state shear. This paper compares the viscoelasticity of different polypropylenes using the results of the experiments.
    利用动态应力流变仪(DSR),对分别使用841催化剂和TK催化剂生产的均聚丙烯(PP24O1)和共聚丙烯(PP1330)两类聚丙烯四种材料进行动态应力扫描、动态频率扫描和稳态剪切三种测试,从测试结果比较四种材料间的粘弹性差异。
    A typical frequency sweep rheogram of nonionic surfactant liquid crystal can be observed at a moderate temperature range.
    中等温度范围内表现出典型的非离子表面活性剂层状液晶的频率扫描曲线形式。
    The epoxidized natural rubber was tested by temperature sweep,frequency sweep and strain sweep by using rubber process analyzer,and the results were compared with that of natural rubber.
    用橡胶加工分析仪对环氧化天然橡胶进行了温度扫描、频率扫描和应变扫描,并和天然橡胶的响应曲线进行了对比。
    Since the approach bases on state-space, it requires no frequency sweep and frequency response curve fitting and therefore has a better numerical property.
    该判据是基于状态空间描述的,从而消除了频率扫描过程和频率响应曲线拟合过程,并具有较好的数值性态.
    The pro-posed approach requires no high order multiplier and no frequency sweep.
    该判据是基于状态空间描述的,从而消除了频率扫描过程和频率响应曲线拟合过程并具有更好的数值性态.
    The viscoelastic properties of lamellar liquid crystal, formed by non-ionic surfactant, were studied with small amplitude oscillation frequency sweep, and the effects of surfactant concentration, temperature , AgNO3 and as-produced Ag on them were investigated.
    利用小振幅振荡频率扫描研究了非离子表面活性剂所形成的层状液晶的粘弹性,考察了表面活性剂的浓度、温度,硝酸银的加入和银的生成对其影响.
    three different kinds of frequency sweep curves appear with increasing temperature;
    随温度升高出现三种不同的频率扫描曲线;
    Experiments including apparent viscosity,thixotropy loop,creep and recovery,little oscillatory shear sweep and frequency sweep of high hygroscopic profile modification HSG sol were conducted.
    研究了高吸水冻胶调剖堵水剂HSG成胶前溶胶体系的流变性能。 通过考察主剂共聚物含量对溶胶体系表观粘度的影响,以及粘温特性、触变性、蠕变-回复、小幅振荡剪切应力扫描和频率扫描实验,确定了溶胶体系的流变性参数。
    With the increasing of copolymer concentration,the elastic increases by creep and recovery test,linear elastic area widens and storage modulus,loss modulus and compound (dynamic) viscosity increase by little oscillatory shear sweep and frequency sweep tests.
    通过小幅振荡剪切应力扫描、频率扫描实验得出随主剂共聚物含量增加,线性粘弹性区域变宽,储能模量、耗能模量和复合动态粘度变大。
 

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