参数变化

The AR spectrum is not restricted by length of data, and AR spectrum parameters are sensitive for law of condition change. Autoregressive transformation is made to vibration signals, and then AR spectrum coefficients are got which can be utilized as feature vectors. Fault diagnosis method for centrifugal pump Based on AR and 2D-HMM is produced in this paper. The topology of this model and its parameters were introduced too.

利用AR谱不受数据长度的限制，AR模型参数对状态变化规律反映敏感的特点，以振动信号做自回归变换后的AR谱系数作为特征向量，将基于AR的2D-HMM引入到离心泵故障诊断中，提出了一种基于AR的2D-HMM故障诊断方法，并论述了该模型的拓扑结构和主要参数以及相应的训练和识别算法。

In the inversion of elastic parameter by AVO, the components make different contributions to the inversion.

在利用振幅随偏移距变化进行弹性参数反演中，这些分量对反演所作的贡献是不同的，体现在各反射波的反射系数与弹性参数的信息量及其组合关系的关联程度是不同的。

The works in the project just done can be summarized as five respects.(1) A device was designed to fabricate the asymmetrical resonant cavities by a pendant drop. A series ARCs with variable parameters provides a valuable experimental method for investigating the characteristics of ARCs.(2) The relationship between the number of active modes and the shape parameters in an ARC was investigated. The experimental lasing threshold was compared with theoretical result, the good agreement between two shown that it was the decrease of the number of active modes in an ARC that decreased lasing threshold.(3) Dye lasing gain was used to enhance the signals of stimulated Raman scattering of the weak gain Raman modes in a circular cavity made by a pendant drop, the instantaneous SRS spectra of weak gain Raman modes in ethanol was obtained by this new method.(4) The SRS signals of minority compound in a binary chemical complex was obtained by using dye lasing gain method. The detection concentration of minority compound was reduced to an order compared with normal SRS method.(5) A cylindrical circular cavity was formed by a liquid jet, which was used to reduce the pump intensity required for laser induced plasma spectroscopy. The limit of detection of trace element in aqueous sample was greatly decreased by this new method.

我们设计并成功制作了使悬垂液滴连续变形的装置，用此装置可以方便地改变非圆对称谐振腔的几何参数，为ARCs的研究提供了一种有效的实验方法；研究了ARCs中活性模式数和变形参数间的变化规律，激光阈值的数值计算结果和激光辐射的实验结果作了比较，二者吻合的曲线说明ARCs中活性模式数量的减少是受激辐射放大阈值降低的原因；在由单元化合物构成的微型圆对称谐振腔中，首次尝试用"激光增益"增强弱增益拉曼模式的受激拉曼散射信号，获得了乙醇分子中弱增益拉曼模式的瞬态SRS光谱；在由二元混合物构成的微型圆对称谐振腔中，用染料的激光增益增强了少量化合物的SRS信号，把少量化合物的SRS信号探测浓度降低了近一个数量级，在SRS应用于瞬态过程的组份分析方面做了卓有成效的探索；用石英毛细管形成的稳定液拄构成拄形谐振腔，降低了激光诱导等离子体光谱需要的激励能量，有效地降低了水相样品的痕量元素分析极限，为LIPS应用于微量元素的化学分析开拓了一条新的技术路线。

The welding conditions can be conformed by the stress situation,6 different parameters were used for all position welding. The activating fluxes were deposed on the metal surface by a brusher.

在分析涂敷活性剂时熔池受力变化的基础上制定了焊接规范，管道全位置焊接时分6段进行参数设置，每一段采用不同的焊接参数。

Characteristic vector which reflect tool wear condition is made of those characteristic parameters.

利用信号处理技术分析AE、Ac及切削力信号特征参数随刀具磨损的变化规律，并将这些特征参数组成反映刀具磨损状态的特征矢量。

Department of Internal Combustion Engine Engineering, JilinUniversity, Changchun 130025, ChinaAbstract: Combustion parameters were studied from a turbocharged inter-cooled diesel engine under constant speed and increasing torque operating conditions with combustion analyzer.

为了研究车用增压柴油机瞬态工况下燃烧参数的变化规律，利用燃烧分析仪在试验台上研究了恒转速变转矩瞬态工况下，油门开度变化率对燃烧参数的影响规律。

It shows to design the condensator of the absorbing solar air condition,and analyse the influence of the heat transfer coefficient by the space between the wing,thickness of the wing,diameter of the tube and the grouping number,in order to achieve the optimizational design,It make the design process celerity and briefness,and make it that the influence other parameter brings more evidence.

对吸收式太阳能空调中的冷凝器进行了设计计算，并对其结构如翅片间距、翅片厚度、管直径、分组数等因素对传热系数、管内压降的影响进行了分析，以达到最优化的设计，本文运用Excel强大的图表和函数计算功能，使计算过程快速、简捷，并可以看到每个参数的变化对其他参数的影响，提出了使用于Excel计算冷凝器设计计算方法，避免了复杂的编程过程，为新型环保制冷机的设计优化提供一定的参考。

Based on the conservation principle of linear and angular momentum,the method derives the equations of the mass and mass center as well as inertia tensor of the new end-effector for the manipulator handling the unknown object.

1引言由于自由飞行空间机器人本体的质量随着载荷及燃料的消耗而发生变化，而目标的惯性参数往往是未知的，因此在运动控制时，必须进行参数辨识。

Compared with smooth tube,micro-fin tube has more geometrical parameters that influence heat transfer to different extent.Many scholars has done much work on it,but some research results are different or even contradictable.

相对于光管，微肋管的结构参数相对较多，这些结构参数的变化会不同程度地影响微肋管的换热能力，国内外的很多学者进行了研究，但结论相差较大，甚至完全相反。

Keywords: definition, curvilinear regression analysis, point sharpness method, modulation transfer function MTF

该评价方法评价参数可通过改进边缘锐度算法得到，然后与机测MTF值的变化趋势一起做曲线回归分析，以便和其他传统清晰度评价参数做对比。

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。