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First, it is discussed about the relation between the dynamic stiffness submatrix of the supports system with variable stiffness and damping and the optimum output-feedback matrix when the rotor-supports system is governed by the optimum control laws.

本章进一步研究转子—轴承系统变刚度阻尼支承振动主动控制问题，提出了在最优振动主动控制规律的有效频率范围以外，对转子—轴承系统进行次优振动主动控制的策略思想。

The experiment has tested and analyzed the velocity, DO and sludge distribution under different conditions of the rotor and submersed boosters. It also has studied the relations between the treatment effect, sludge deposit, sludge up-floating and the depth of oxidation ditch.

本试验在转刷及水下推动器不同开启状况下的流速分布、溶解氧分布和污泥分布做了测试和分析，研究了处理效果、污泥沉积、污泥上浮和氧化沟沟深之间的关系。

The dissertation has drawn the achievements which are helpful to mechanical fault diagnosis from the research of nonlinear rotordynamics. A detailed theoretical analysis is made for subharmonic and superharmonic resonances of weak nonlinear Jeffcott rotor systems, and an experiment is done to verify theoretical conclusions.

总结归纳了国内外转子系统非线性动力学研究中业已获得的可资机械状态监测与故障诊断领域借鉴的成果；对弱非线性Jeffcott转子系统的次谐波和超谐波共振以及参数的影响，进行了详细的理论分析和实验研究。

The influences of the nonlinear clearance-excitation fluid force of turborotor on the dynamic behaviors of rotor's axial rub-impact are insignificant. The only effect is the appearances, in the axial response, of the higher order superharmonic components of even-time working frequency at low rotating speeds.

分析表明，非线性涡轮叶尖间隙流体激励力对转子轴向碰摩的非线性特性影响不很明显，只是在低转速时轴向振动碰摩响应中会出现更高阶的偶数倍频的超谐波成分。

The selectable equipments are rotor mast aiming system, two pods with 2 TOW missiles for each, Blackhole infrared suppresser, two pods with 2 Stinger missiles or other types of air-to-air missiles for each, FLIR system for pilot, AN/APR-39(V-1) radar warning system, fuel tank on hardpoints, advanced avionics and mission equipments.

旋翼轴瞄准具可将视频信号输给飞行员的电视显示器。旋翼轴瞄准具备激光测距仪。为了不被敌人发现，"防御者"Ⅱ直升机可借助旋翼轴瞄准具在树木或地形后面进行隐蔽悬停，而且还能观察战场远处的情况。只要稍作改装，就可安装为OH-6A研制的标准轻型航空电子设备。

In order to study half-speed whirl that is subjected to nonlinear oil force of rotor-bearing system, the Wu Elimination method and symbolic calculation method are combined in this paper.

为研究转子轴承系统中非线性油膜力引起的半速涡动，本文给出了将吴文俊消去法和符号计算相结合的分析方法。

Second the characteristicsSingle-stage single suction in-line centrifugal pump of Roots vacuum pumps: comparison with other oil seal vacuum pumps have the following characteristics: 1 in a wide pressure range with a large pumping speed; 2 the rotor has a good geometric symmetry it is vibration smooth operation.

二、罗茨真空泵的特点：与其它油封式真空泵相比有以下特点： 1、在较宽的压力范围内有较大的抽速； 2、转子具有良好的几何对称性，故振动小，运转平稳。

This paper describes a demarcation and decoupling technology of helicopter bearingless tail rotor flexible beam,this technology can be used to solve the problem of flapping bending moment and lag bending moment coupling that encountered in bearingless flexible beam fatigue test,it also can be used to separate each test load component on the section effectively and to reduce the test error.

本文介绍了一种直升机无轴承尾桨柔性梁标定与解耦技术，该技术能有效地解决无轴承尾桨柔性梁在试验中挥舞弯矩与摆振弯矩的耦合问题，并能有效分离截面上各分项试验载荷，减少其试验误差。

To clear this propeller the rotor pylon was raised above the cabin and the tail unit was redesigned as a twin-boom assembly, that of the V3 carrying two end-plate oval fins and rudders while that of the V4 had a single fin and rudder mounted on the tailplane centre.

要清除这个重新设计的尾部螺旋桨转子螺旋杆菌是上文提到的船舱和单位被视为双繁荣集会，方向舵和V3的是携带的两个端板椭圆鳍而 V4，该有一个尾翼和方向舵安装在机尾的中心。

The phase of ω0 frequency fluctuates tempestuously. The resonance peaks of flexural and torsional vibrations response are present at 2/3ω0 1/2ω0 1/3ω0 and 1/4ω0 with three kinds cracked rotor models. Near 1/2ω0 frequency, quasi-periodic and chaotic motions maybe appear. Periodic, quasi-periodic and chaotic motions show on alternately when the rotating speed is near to 2/3ω0.Combined step-by-step integral method with traditional transfer matrix method, an increment transfer matrix method is put forward.

研究结果表明：各种故障情况下，华北电力大学博士学位论文弯振和扭振之间都存在祸合关系，但弯扭祸合振动一般不会威胁机组安全运行：在叶片丢失或滑环飞脱故障时，将产生很大的弯振，同时各转子扭振也将被激发出来，它以工倍频和前三阶固有频率为主；在各种电气故障情况下，各转子都很快被激励出较大幅值的扭振来，相应各转子弯振也发生一定的变化，但它的变化明显滞后于扭振，扭振和扭矩主要以前三阶固有频率为主。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。