The thesis presents some modifications to make the strip theory results meet engineering demands enough even when the oscillating frequency is relatively high 本文提出了一些針對性的改進措施,使之在短波長情況下也能給出滿足工程需要精度的結(jié)果。
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 以氮氣做工質(zhì),在加熱溫度為365的情況下,獲得最大的壓比為1 . 047 ,頻率是91hz 。
( 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 在實驗中發(fā)現(xiàn),在一定的加熱溫度和工作壓力下,系統(tǒng)的自激振蕩的頻率從第二諧振頻率跳變到第三諧振頻率。
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 實驗結(jié)果表明多種因素引起了振蕩頻率的偏移,包括二極管的非線性、電源電壓的波動、負載的牽引、環(huán)境溫度濕度變化以及電路板設計方面的因素等。
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 然后針對我國勵磁系統(tǒng)概況,以ieeeac1 、 ac2和st1型標準勵磁系統(tǒng)為例,對其參數(shù)進行了辨識與優(yōu)化,并對每種勵磁系統(tǒng)模型給出了一套動態(tài)性能符合國家標準的參數(shù),以供仿真計算或規(guī)劃設計使用。