小振动

Supposing that the pavement depression is a Ricker wavelet function ,and then the moving vehicle s vibration level induced by it can be obtained by simplifying the vehicle to a two DOF vibration system.

本文将高速公路路面凹陷变形假设为Ricker 小波函数，将车辆简化为两自由度的振动系统，分析了由于路面凹陷变形引起的车辆振动水平。

Hubert change and secondary spectrum analysis were used to deal with the reconstructured signal sequently.

采用小波包分解的方法提取滚动轴承振动信号中能量集中的频段并生成相应的重构信号，对重构后的振动信号进行Hilbert变换和二次频谱分析。

HARDWARE AND FITTINGS FOR CONDUCTOR TYPE ACSR-BISON Tension joints Repair sleeves Flexible spacers for span Rigid spacers with 40 kg counterweight for jumpers Vibration dampers, Stockbridge type Vibration dampers, loop type Sub-Total, item 2.1 – 2.5 Alternatively, to replace items 2.3, 2.5 or 2.5 alt.

五金及配件导线型钢芯铝绞线，拜森张力关节修复袖子灵活间隔的跨度刚性间隔与40公斤重的跳线振动阻尼器，斯托克型振动阻尼器，环型小计，项目2月1号至2月五号另外，以取代项目2.3 ， 2.5

Though analyzing and studying the following conclusions are gotten:(1) The fault features can be extracted from the unstably and stably vibrant signals in different extents by the methods of STFT, WPARMS and SOCS effectively (2) The acceleration signals not only possess far higher signal-noise rate of feature information than that of the stable, but also conceal the feature information which has not in the stable signals.

通过分析与研究，得出了如下结论：(1)短时Fourier变换、小波包AR谱、二阶循环谱均能有效处理发动机稳态和非稳态振动信号。它们都能在不同程度上提取出包含在振动信号中分析对象的故障特征。

The vibrometer system is small in size, low in cost, easy to be collimated, and used to non-contact measurement.

该仪器体积小、成本低、易于准直、可以非接触式测量，能够测量振动频率在50 kHz内的物体，其中包括非周期性振动。

Wavelet packet decompresses vibration signals, and wavelet packet nodes which are sensitive to the change of state, as eigen-nodes, form a decomposition tree; the signal restructured at all eigen-nodes can be used as the fingerprint in many breaker diagnostic systems. Support vector machine with the "most important" factors at eigen-nodes as input vector classifies the states at "one to others" strategy.

首先利用小波包分解振动数据，提取状态变化敏感节点作为特征节点形成分解树，利用敏感节点重构完好状态振动信号，并以此作为当前大多断路器诊断系统中使用的指纹信号；同时提取特征节点最大系数形成特征向量，作为支持向量机的输入向量，使用&一对其余&策略进行特征分类。

Concrete formula adopted computer control sand, stone, water, cement, admixtures measurement as well as various specifications of models with a variety of processes ( centrifugation, suspended roller, plug-in, PCCP, wind-driven, core-mode vibration technology) series die, various interfaces, such as drainage pipes: level I, level I, socket type, F-type pipe jacking mode, three-stage pressure pipe vibration Process modules for the largest caliber DN3m 4m (domestic exclusive use of stress to eliminate mold, sand blasting processes), is China's only capable of producing PCCP steel cylindrical pressure tube and a variety of cement pipes, such as a full set of equipment and tooling manufacturers, who national key project ¤- Inner Mongolia Wanlian Brothers Pipeline Company Diversion Project, Jilin pipeline, dragon pipe industry, Fujian Nampo, Xi'an, Shanghai tunnel company, REN Bang Tianjin, Beijing, Hubei, China and South Africa, Zhengzhou Jinlong, Nanjing, Zhejiang Tenglong Xinjiang National Unification, Liaoyang Xiaotun so water and drainage pipes around the country supporting the project.

混凝土配方采用电脑程序控制砂、石、水、水泥、外加剂计量以及各种规格型号与各种工艺的（离心、悬辊、插入式、PCCP，风动、芯模振动工艺）系列模具，各种接口形式，如排水管：平口、企口、承插式、F型顶管模、三阶段压力管振动工艺模的最大口径为DN3m×4m（国内独家采用模具应力消除、喷砂工艺生产），是全国唯一能生产PCCP钢筒压力管以及各种水泥管等全套设备与模具的厂家，曾为国家重点工程─—内蒙古万联兄弟管道公司引水工程、吉林管道、巨龙管业、福建南浦、西安、上海遂道公司、天津任邦、北京、湖北中南、郑州金龙、南京、浙江腾龙、新疆国统、辽阳小屯等等全国各地引水与排水管工程配套。

The low-frequency noise in the structure-acoustic field coupling system of high-speed train was simulated and analyzed.

对某高速列车拖车的仿真分析结果表明：该车声学测试点的总声压级超出了TB 1809—86标准拖车客室的容许噪声值；在某些计算频率下，车体某些部件涂敷阻尼材料后对客室测试点的声学贡献由小变大，这说明阻尼材料不仅改变了这些部件的振动幅值，同时也改变了振动相位。

Research experiments indicate that the main factors affecting cutting force are feed and vibrating amplitude. The cutting speed and frequency in vibrating drilling are ...

研究结果表明，进给量和振动振幅是影响切削力的主要因素，切削速度和振动频率对切削力的影响较小，而频转比对切削力的影响很大。

When the eardrum vibrates, the ossicles amplify these vibrations and carry them to the inner ear.

当鼓膜振动的小骨放大这些振动和执行他们的内耳。

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。