preset frequency 中文意思是什麼
preset frequency
解釋
預調頻率-
The fifth chapter experiments on the cushioning performance of the three sets of systems with pid / pdf algorithm. mainly on how to influence the systems cushioning performance while changing the preset input signal frequency and the load mass. and on the systems " repeatability. reappearance and the stability. additionally this chapter compares the pid algorithm with the pdf algorithm in their influence on system cushioning performance. the final experiment results testifies that the thesis successfully realizes the expected cushioning effects of the three different sets of high - speed pneumatic system
第五章對pid 、 pdf控制策略系統緩沖性能進行了實驗研究，主要研究了給定輸入信號頻率的改變對系統緩沖性能的影響、長時間工作時系統的重復性和再現性以及不同負載質量下系統的緩沖性能的實現；同時比較了pid 、 pdf控制策略對系統緩沖性能的影響。最後實驗結果表明，本課題用pid 、 pdf策略很好的實現了三套不同類型的高速氣動系統的緩沖，緩沖效果是很不錯的。 -
This paper discussed the theory of switching - node preset optimal spwm detailedly, and got the solution of 9 waves, 13 waves, and 17 waves switching - node preset optimum spwm control strategy. furthermore, by means of raising the switching frequency, the quality of output voltage can be promoted, the resonate frequency of output filter can also be raised, which made the inverter smaller volume and lighter weight and more efficient
本文首先對開關點預置最優spwm控制策略進行了深入研究，分別求解出了九塊波、十三塊波、十七塊波等情況下的最優spwm控制的開關角，並討論了在提高開關頻率之後進一步優化輸出濾波器設計，在保障系統效率的前提下，提高輸出波形質量和減小濾波器的體積重量。 -
The mixed control chip sg3525a combined with hardware pi controller generates the high - frequency pwm pulse for the first inverter. the digital control block tms320lf2407a mainly provides current preset for constant - current source through the outer filter, pwm pulse for the second inverter and drive signal for the high - frequency pulse power supply
其中變極性電源的一次逆變pwm信號由pwm發生晶元sg3525a ，配以外部硬體電路pi調節器產生;一次逆變閉環控制迴路的電流給定（配以外部濾波） 、二次逆變pwm驅動以及高頻脈沖電源的控制則由tms320lf2407a數字控制器實現。
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