| 1. | The thesis presents some modifications to make the strip theory results meet engineering demands enough even when the oscillating frequency is relatively high
本文提出了一些针对性的改进措施，使之在短波长情况下也能给出满足工程需要精度的结果。 |
| 2. | The oscillating frequency is 91 hz . experimental investigation has been made on the influence of the operating parameters and structure parameters on the performance of the system
以氮气做工质，在加热温度为365的情况下，获得最大的压比为1 . 047 ，频率是91hz 。 |
| 3. | ( 3 ) the frequency may transit from the second harmonic oscillating frequency to the third one when the hot temperature is higher than the specific temperature and the pressure is higher than the specific pressure
在实验中发现，在一定的加热温度和工作压力下，系统的自激振荡的频率从第二谐振频率跳变到第三谐振频率。 |
| 4. | As the experiment results show , multiple reasons led to the offset of oscillating frequency , including diode ’ s nonlinear characteristic , fluctuation of electrical source voltage , traction of load impedance , change of environmental temperature and humidity and the design of circuit
实验结果表明多种因素引起了振荡频率的偏移,包括二极管的非线性、电源电压的波动、负载的牵引、环境温度湿度变化以及电路板设计方面的因素等。 |
| 5. | Ieee ac1 , ac2 , and st1 excitation systems are selected as examples , and their parameters are identified and optimized in order that the performance indexes of the excitation systems can meet the requirements of the standards . ( 3 ) a method based on some test signal ( test signal method ) is developed to find the dominant oscillating frequencies and dampings associated with any generator in the system
然后针对我国励磁系统概况，以ieeeac1 、 ac2和st1型标准励磁系统为例，对其参数进行了辨识与优化，并对每种励磁系统模型给出了一套动态性能符合国家标准的参数，以供仿真计算或规划设计使用。 |
| 6. | Principal conclusions were drawn as the following : the non compatibility of pressure or velocity of the gas on both sides of the contact surface is the cause of the formation of shock wave ; the heating effect of reflective shock wave to driving gas during charging or exhausting process is the internal mechanism of peak oscillating effect , and all the factors that influence the formation and the running of the shock wave will influence the peak oscillating frequency , cooling effect
主要结论如下：热分离机内激波形成的原因是射气瞬间接触面两侧压力和速度不相容；峰值振荡效应的内在机制为反射激波对充气阶段的驱动气或低温排气的加热，凡是影响激波形成及运动的因素都将对峰值振荡频率、冷效应及热效应产生影响；当充、排气时间比为0 . 1763时，最佳射流激励频率出现在高阶峰值振荡频率上。 |
| 7. | Third , a solid lubricant embedded 40cr - ptfe bearing and a bronze c86300 - ptfe bearing were prepared . the comparatively tribological tests were performed in an oscillating sliding tribotester . the conditions were a contact mean pressure of 80 mpa , an oscillating frequency of 0 . 13 hz and relative humidity of
选择40cr - ptfe镶嵌型轴承与高强铜合金c86300 - ptfe镶嵌型轴承在nh - 100型重载摆动摩擦试验机上进行对比摩擦试验,试验条件为:承载压强80mpa 、摆动频率为0 . 13hz以及相对湿度为( 60 3 ) % 。 |
