激振器

Using the hotwire anemometry,the experimental study is carried out on a novel multi-diaphragm piezoelectric synthetic jet actuator.

利用热线风速仪，在最佳激振频率f=560 Hz时，研究了不同孔径、不同孔深、不同小孔出口几何形状等对多压电膜式零质量射流激励器性能的影响。

There are many problems when using it, so it needs to be absorbed by users.

因此，本文以连铸机结晶器伺服激振控制系统为对象进行了研究。

Before driving under the exciting force to be checked at both ends of the two vibrators fixed eccentric block, adjustable eccentric angle is the same as the block to check whether the fasteners completely secure fastening; inspection of electrical wiring and insulation is good .

开车前应根据激振力的要求检查两振动器两端固定偏心块、可调偏心块的夹角是否完全相同，检查紧固件是否完全紧固牢靠；检查电气接线及绝缘度是否良好。

In this paper it is believed that the onset process is from the unorderly sound waves generated by heated gases, through ordering the sound waves, regenerator onset in a high natural frequency, followed by steady oscillation whose frequency is controlled by resonance tube.

本文认为热声热机的起振过程是从气体被加热产生杂乱的声波开始，经过声波的规则化先从回热器的高频率自激振荡振动，继而扩展到以谐振管内气体固有频率为主导的整个系统的稳态起振。

The distribution of gear's contact stress, root stress, and contact engagement line in the engagement situation of gear pairs, were obtained on the base of explicit integration method. 3. Adopting the method of system matrix, the torsional vibration differential equation of general shafting was gained. The simple harmonic forms of excitation torque under the normal combustion or piston flameout of in-line engine and v-type engine were analysed. The decoupled algorithm of free vibration and forced vibration and the solution to the vibration damper's energy of resistance and the off-resonance calculation were studied. The sensitivity formulations of the natural frequency and vibration mode to physical parameters of system were derived by solving the eigenvalue problem. These sensitivity formulations provided the theoretical base for the dynamic modification of structure.

运用系统矩阵法建立了轴系的扭振微分方程，并对直列和V型发动机在正常发火和气缸熄火工况下的激振力矩进行了详细的简谐分析；基于精确方法推导了自由振动和强迫振动的解耦算法，给出了能量法计算中的减振器阻尼功求解和非共振计算方法；并研究了曲轴系扭振非线性分析中的变惯量问题，得到了单缸转动惯量的精确求解公式以及变惯量和固有频率的关系式；最后，从特征方程和振型正交性出发，推导了固有频率和振型对轴系转动惯量和刚度等物理参数的灵敏度，为扭振系统的结构动力学修改提供了理论基础。

Therefore, established a finite element Stable response model of a horizontal whole string and carried out t the safety varied frequency of gas well after researched the natural seriously transversal vibration and compressional vibration frequency range of tubing string with packer and packerless, so that it make the tubing string to avert the covibration frequency range of natural gas excited.

本文认为以某井高产量稳产时，天然气对油管柱的外激励为简谐激振，因此研究中建立某水平井全井段油管柱稳态响应的有限元力学模型，并获得了在无封隔器和有封隔器情况下的油管柱发生严重横振和纵振的频率范围，提出了天然气安全调节频率范围，使油管柱避开可能引起严重破坏的天然气激励频率区域。

Laser imaging imagesetter to laser are crystal moduators or galvanometric system of electronic color screen, the computer-controlled laser or blocked in order to reach a record of silver halide film forming images on exposure, high precision by the treatment of development for World silver halide film.

激平影像照排机机，以激平为平源的晶体调制器或振镜编制举行的激平电子分色增网，施计算机把持使激平堵住或被不准以到达纪录银盐软片上曝平变成影像，不纬显影得回矮精度的网点银盐底片。

Capstan setter mainly by the laser, optical systems, film conveyor, with this device, laser sources stay, the exposure light deflection to rely on galvanometric and Prism′s rotation.

绞盘式照排机次给由激平器、平学编制安拆、胶片运输安拆构不败，在这个摆设洋，激平平源变不静不不静，曝平平线的偏转凭借振镜和棱镜转不静达成的。

Three new types vibrating screens with high screening efficiency were proposed based on the principle of screening process with constant bed thickness.

更多可行性进行了分析，大型振动筛设计中，在香蕉筛基础上，采用了由管群通过跨中的静定板与两根激振器梁的耦联构成的超静定网梁结构。

A hydraulic resistance instrument composed by two pressure transducers was used to measure the hydraulic resistance across the two kinds of channels. The impedance on both channels was measured by a four electrodes impedance instrument with 5kHz constant current. A vibration generator was put on one set of the channel to produce about 50Hz sound waves. The signal was detected by a crystal pickup on the other set of the channel to examine the transmission of the wave along the two kinds of channels.

使用双压力传感器流阻仪对两种通道的流阻进行测定；使用5kHz恒流四电极方法对两种通道的阻抗进行测量；使用激振器在通道的一端产生一个约50Hz的振动，在通道另一端用晶体拾音器检测振动信号，对两种通道的声音传导特性进行了测定。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了