实验法

Many researchers have devoted their work to the development of modal analysis extraction techniques in order to obtain more reliable identification of the modal parameters. There are many damping identification methods, but each one has different merit and defect. In order to find which one is the most reliable method with respect to certain characteristics, this thesis focus on how to identify structure's damping in time domain. The following works have been done in this thesis: 1. Investigate four modal analysis methods——the LSCE Method, the Ibrahim Time Domain Method, the Time Domain Collectivity Modal Parameter Method, the Rational Fraction Polynomial Method and improve on the ITD Method in arithmetic.

本文主要做了如下工作： 1、集中研究了四种常用的模态识别方法，即最小二乘复指数法、Ibrahim时域法、时域总体模态参数辨识法及有理分式多项式法，并对ITD法在算法上进行了一定的改进； 2、建立结构动力模型，利用这四种方法在具体条件下识别结构的阻尼，并绘制相应的图； 3、讨论不同的情况下，不同的识别方法对阻尼识别精确性的影响； 4、基于业已明确的阻尼识别的精确性，根据研究的需要，指出在实际的识别过程中，如何选择最佳的识别方法以及识别过程中需要注意的问题； 5、选择最为精确的阻尼识别方法，以导师李书进教授在日本京都大学防灾研究所强震反应实验室所做的一足尺木制结构房屋的动力测试实验为实测模型，识别其阻尼； 6、在本文的最后，尽作者所知，提出了一些需要改进的地方，并对未来的研究方向给出了作者的建议。

In this paper, the characteristics of the spray evaporation and mixing process within a wide range of injection pressures (40MPa134MPa) were investigated in a constant volume bomb with high pressure single fuel injection by using high-speed laser shadowgraphy and schlieren photography, image processing technique as well as Malvern Droplet and Particle Sizer etc.

作者在所研制的单次可控燃油喷射系统、定容实验装置上采用高速激光阴影法和纹影法和先进的图像处理技术，同时使用Malvern粒子分析仪，在很大的喷射压力范围内对直喷式柴油机燃油的喷雾特性及其混合过程进行了系统的实验研究和理论分析。

We made a comparison of using laser method and comprehensive method(pipette analysis-sieve analysis)to do grain size analysis for 65 sediment samples from the South Yellow Sea area.The analysis result from the laser method is very close to that from the sieve method.

本文主要通过实验研究，对南黄海沉积物用激光粒度分析仪和沉降法、筛析法取得的测试结果作对比研究，探讨激光粒度分析结果在该海域应用的可靠性。1粒度分析方法的基本原理1.1综合法通常联合使用筛析法和沉析法叫综合法。

We first use magnetic nanometer particles to purify the GRP, then take count of the living cells which induced by GRP.

实验用磁性纳米粒子吸附法纯化水提物中的蛋白成分，通过活细胞计数法确定以连有纳米粒子的GRP为实验药物。

The paper reviews the various techniques commonly used in the kinetic measurement for metal hydrides,including volumetric method and thermal analysis method.

本文概述了测定金属氢化物反应动力学常用的各种实验技术，包括定容法和热分析法等，分析了不同实验系统测量误差的产生和消除，总结了各种技术的特点和不足，并对新技术的发展趋势进行了展望。

The experimental results showed that the reproducibility of Washburn dynamic equation to study the wettability of wastewater treatment filter media was good and the experimental method was feasible.

用Washburn动态法研究了核桃壳、磁铁矿和陶粒砂滤料的亲油亲水性，并对其表面结构进行了表征。结果表明，用Washburn动态法研究水处理滤料润湿性的实验重复性较好，实验方法可行。

In this paper, the author adopts Voltammetry and Wheatstone bridge to measure medium, high, and low resistances of three different resistance values, and makes an objective comparison and analysis, which provides some reference for the method choice of resistance measurement experiment.

本文通过实验对伏安法和惠斯通电桥法分别测中、高、低三种不同阻值的电阻，并进行了客观的比较和分析。为实验中测量电阻时选取合适的测量方法提供一些参考。

And an on-line adaptative training algorithm of the weights of neuron is given, which enhances fusion precision of the model, fault tolerance and adaptive ability for subsystems 4 In order to diagnose the soft fault of integrated system, a new fault detection method is proposed based on federated filter, which can detect fault of system in short interval and greatly enhance the method sensitivity to fault A fault diagnosis method of Dynamically Tuned Gyro baesd on parameter estimation of kinetics model of rotor, and signal pretreatment, parameter estimation and strategy of fault identification are studied in detail The method can locate fault of DTG correctly and effectively, which provides a new approach and idea for gyro fault diagonsis 5 In order to diagnose the hard fault of integrated system, fault tree analysis is studied on fault disgnosis of integrated system circuits, and the hardware and software of disgnosis system are developed, with faults located to main module and circuit For futhur diagnosis, an optimal measurement technology in detection of circuits is discussed by improving an algorithm based on information theory, and a pratical method based on half-split method is proposed.

针对组合系统的软故障诊断问题，提出了基于联合滤波模型的一种新的故障检测算法，给出了算法的理论推导过程，该算法能在较短的时间内检测出系统故障，提高了算法对故障的敏感度；研究了基于动调陀螺转子动力学模型参数辨识的故障诊断方法，就其中的信号预处理、参数辨识及故障决策方法等关键技术进行了详细的研究，该方法可以正确、有效地检测与定位动调陀螺故障，为陀螺故障诊断提供了新的途径和思路。 5。针对组合系统的硬故障诊断问题，研究了基于系统浅知识推理的故障树法在组合系统电路子系统故障诊断中的应用，开发了相关诊断系统的软硬件，故障可定位到系统的主要功能模块和电路板级。为了进一步的故障定位，研究了电路板故障的最优检测问题，完善了基于信息理论的优化算法，并提出了基于&对分法&的一种实用的优化算法，故障可定位到电路板的主要功能元件级。在组建的SINS/GPS组合系统实验平台上，针对上述研究内容，进行了大量的实验研究。

To study on extraction of essential oil from Alpinia officinarum Hance by cellulase and ultrasonic, the effects of ultrasonic time, temperature and time of water bath, amounts of cellulase on the extraction efficiency of essential oil from Alpinia officinarum Hance were investigated. And the influence of the four factors was determined by orthogonal experiment.

研究了酶法、超声波辅助水蒸气蒸馏法提取高良姜中的挥发油，对超声时间、水浴温度、酶作用时间、酶用量进行单因素实验分析，在此基础上做正交实验。

The experimental results show that the mean particle size of griseofulvin precipitated by RESS is smaller than 1, 0μm, narrow distribution and 95％ fine particles is smaller than 1. 0μm. Increase of the pre-expansion pressure, the extraction temperature, the expansion chamber temperature, the spraying distance, the concentration of cosolvent and decrease of the nozzle diameter resulted in decrease of the particle size under the operating condition studied. Enhancement of the pre-expansion temperature resulted in increase of the particles size. The SEM of GF shows that the shape of original is atactic and a wide size distribution, but the microparticles obtained by RESS is reverse. Similar melting points and XRD patterns were observed for the original material and the precipitates obtained by RESS.

实验结果表明，用含夹带剂的RESS法制备的灰黄霉素微粒的平均直径在1μm左右，且分布均匀，95％微粒在1μm以下，仅用CO〓作为超临界流体制备的微粒与上述方法制备的微粒的平均直径和分布相似，只是产量太低，而用机械法制备的微粒平均直径在3μm左右且分布较宽；不同的过程参数对沉析微粒尺寸有不同的影响，预膨胀压力、膨胀室温度、溶解温度以及夹带剂浓度的提高或增大，均可使沉析微粒的直径变小；预膨胀温度提高，所得微粒的直径变大；喷射距离的增加，沉析微粒的直径变小；喷嘴直径越小，由此制得的微粒的直径就越小；根据实验结果还可知道，通过理论计算的马赫盘处微粒的直径可以较好地估计出膨胀室中收集到的微粒的直径。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。