諧波譜 的英文怎麼說
中文拼音 [xiébōpǔ]
諧波譜
英文
harmonic ectrum-
In this thesis, summarized the basic theories of fourier transformation and the fast fourier transformation that are generally adopted to detect and analyze the electric power harmonic in the electric power supply system. at the same time, summarized the even sample principle, the phenomenon of frequency mix, the window functions and the frequency leaking as so on, those are closely - related to sample from figure signal
簡要闡述了電力系統諧波檢測分析所普遍採用的傅利葉變換和快速傅利葉變換的基本理論以及與數字信號采樣密切相關的均勻抽樣定理、頻譜混疊現象、窗函數和頻譜泄漏等的基本理論。Summarized no - line loads and the present situations of the electric power harmonic pollution in the guangyuan district ' s electric power supply system ; explained the theories of fourier transformation and the fast fourier transformation those are widely adopted by majority scholars to examine and analyze the electric power harmonic in the electric power supply system. summarized the principle of even sample, the frequency mix phenomenon, the window functions and the frequency leaking as so on, those are closely - related to the figure signal
簡要闡述了電力系統諧波檢測分析所普遍採用的傅利葉變換和快速傅利葉變換的基本理論，簡要闡明了與數字信號采樣密切相關的均勻抽樣定理、頻譜混疊現象、窗函數和頻譜泄漏等的基本理論，同時闡述了電力系統的諧波檢測與分析的相關理論基礎知識。Because massive harmonic interference in the electrical network, it causes signal - sampling to include the very big harmonic in the measurement system, for eliminating measurement result influence by harmonic, the paper has an in - depth study of fourier transformation harmonics analysis measurement principle, analysis the forming reasons of frequency spectrum leakage and railing effect during measurement, achieves phase locked loop and frequency multiplier technique to realize integer - period synchronous sampling and eliminate impact of frequency spectrum leakage and railing effect in the result of measurement, and investigates in depth theory on phase locked loop and frequency multiplier technique, gives the method of realizing phase locked loop and frequency multiplier technique
由於電網中存在大量的諧波干擾，導致測量系統中取樣信號也含有很大的諧波，為了消除諧波對測量結果的影響，論文深入研究了傅立葉變換諧波分析法的測量原理，分析了測量中頻譜泄漏和柵欄效應形成的原因，提出了採用鎖相環倍頻技術實現信號的整周期同步采樣，消除頻譜泄漏和柵欄效應對測量結果的影響，並對鎖相環倍頻技術的理論進行了深入研究，給出鎖相環倍頻技術的實現方法。Therefore, using the ar model and the prony model to measure the inter - harmonics, an inter - harmonics measuring algorithm which is based on advanced spectral estimation is presented
然後，文章提出了一種基於現代譜估計的間諧波檢測演算法，演算法應用ar模型和擴充prony模型進行間諧波檢測。The studying results show that the advanced spectral estimation is more predominant than dft algorithm and its corrected algorithms in the field of inter - harmonics measuring, especially for the inter - harmonics which is too close to harmonics. hence, it is effective and feasible to introduce the advanced spectral estimation into inter - harmonics measuring
上述研究證明，在間諧波檢測領域，特別是對離諧波頻率較近的間諧波檢測中，現代譜估計理論有著許多dft演算法及其校正演算法不可比擬的優勢，將其引入電力系統間諧波檢測中是有效可行的。Because of the spectral line splitting of the burg algorithm, the recursive algorithm of the ar model, we choice the hamming weighted burg algorithm in this paper. the modified burg algorithm can weaken the spectral line splitting effectively. however, the ar model can ’ t gain the phase of the inter - harmonics
由於ar模型的遞推演算法burg演算法存在譜線分裂現象，文中選擇使用hamming窗加權的burg演算法來遞推ar模型，修正後的burg演算法明顯減輕了譜線分裂現象，具有較好的抗噪聲能力，但無法得到間諧波的相位信息。In addition, the time - width of pulse also influences hhg. to some extent the spectrum of hhg will become be tter when the time is prolonged
另外，激光脈沖時間的長短也會影響到高次諧波的性質，在一定范圍內，隨著脈沖時間的加長，電離率逐漸增大，譜線結構也越來越明顯。In the sonograms of psittacula agapornis after the section of right side nxiits the ascending parts of the tone disappeared. this causes their vocalizations became the descendent - call. and in the sonograms with the left side nxiits sectioned, the harmonic parts above the basic song were weaken or disappeared
牡丹鸚鵡在斷右側nxllts后其聲圖中音調上升支消失，因而其叫聲變為以降音調為主的降調叫聲；在斷左側nxllts后的聲圖中，其基本音以上的諧波成分減弱或消失而在斷雙側神經后其聲圖表現為一系列具有較低基頻的寬帶諧波譜。Dual randomized modulation technique is more effective than existing simple random modulation schemes, such as random position modulation or random switching frequency modulation, in dispersing the power spectrum
與已經存在的任何一種單隨機方案相比，雙隨機調制技術驅散諧波能量而使之具有更寬的帶寬，能更加有效地減少功率變換器系統的離散譜峰值。As an example using sine wave, the effect of vibration amplitude and frequency and time on bit error rate is researched
以振動譜中典型的正弦諧波為例，推導了振幅、頻率和時間對誤碼率的影響。Abstract : applying the frequency - domain representation of the complex signals in a three - phase system, a harmonic detection method based on the in - phase correlation filtering was put forward in this paper, which can be used to detect effectively the generalized harmonics in the three - phase system except the fundamental of positive sequence
文摘:採用三相系統復信號的頻域表示並根據頻譜搬移原理，本文提出了一種基於同步相關濾波的諧波檢測方法，可用於三相電路中除正序基波以外廣義諧波的有效檢測。There are functions such as drawing the chart of amplitude - frequency and phase - frequency, calculating and displaying the highest peak value, the total sum of amplitude and the effective line - breadth of the signal in the program. so an effective technical means is supplied for the analysis of ultrasonic signal
軟體系統具有幅頻圖及相頻圖的繪制、最高峰值、諧波系數及有效譜寬度的計算及顯示等功能，從而為超聲信號的頻譜分析提供了極其有效的技術手段。So power systems harmonic analysis is a significant aspect of power systems research. power system harmonic analysis was realized usually with fast fourier transform ( fft ), but the method exits spectrum leakage, and can not analyse all harmonic parameters exactly, such as frequency, amplitude and phase, in particular has big phase error
電力系統諧波分析通常都是通過快速傅立葉變換（ fft ）實現的，但是這種方法存在柵欄效應和頻譜泄漏，使計算出的諧波參數即頻率、幅值和相位不準，尤其是相位誤差很大，無法滿足準確的諧波測量要求。The paper, for the harmonics detection method used in power system, presents an sampling method based on frequency multiplication phase - locked. through phase - locked loop to track the power wave, which not only reduces the affect of spectrum leakage to the harmonics analysis, but also realizes quick. accurate and, real - time measurement
本論文主要針對電力系統中採用的諧波測量方法而提出的一種基於鎖相倍頻採集方法，通過鎖相環對電力波形進行實時跟蹤，既解決了頻譜泄漏對諧波測量精度的影響，又實現了快速的，準確的，實時性的測量。From theoretical analysis, we know the existing demodulation methods have limitations as following : one is that the subtraction of the two signals frequencies will display as the result of demodulation when we demodulate two time - domain adding signals without modulating information ( fault information ) ; the other one is that aliasing phenomenon will occur as a result of getting absolute value, detection or square in the process of generalized demodulation analysis, such phenomenon will result in some superfluous frequency composition on the frequency spectrum, which will puzzle the detec tion of mechanical vibration. if the sampling frequency is selected from a suitable range, the aliasing phenomenon will be avoided ; the last one is that aliasing frequencies will be produced in zoom demodulation analysis because this algorithm cannot employ digital low - pass filtering to avert the folding frequencies of higher harmonics in the process of zoom sub - sampling
現有的解調分析方法存在以下三種局限性：將不包括調制信息（故障信息）的兩時域相加信號，也以其頻率之差作為解調信號而解出；廣義檢波濾波解調分析中，由於取絕對值、檢波或平方過程可能產生混頻效應，在解調譜中表現為無法分析的頻率成分，並由此推導出避免這種混頻現象的采樣頻率的選取范圍，從根本上避免此類誤診斷的產生；幾種細化解調分析新演算法中，因為無法在細化分析的選抽時進行數字低通濾波，有可能會出現調制頻率的高次諧波成分發生頻率混疊而反折到低頻部分的現象。It is studied that small inclusions in aluminum alloy are detected by ultrasonic transmission method in this paper. frequency analysis of the ultrasonic signal is done. harmonic factor and relative valid spectral power are calculated
本文採用超聲穿透法對ly12鋁合金板材細小夾雜物進行了檢測試驗研究，並對超聲信號進行了頻譜分析，計算了諧波系數和相對有效譜功率。Our study indicates that intensity of odd - order harmonic generation decreases, even - order harmonic generation appears and the hhg spectrum exhibits a double - plateau structure in the presence of a static electric field
研究表明，靜電場加入后，奇次諧波的強度有所降低，並且諧波譜中出現偶次諧波和雙平臺結構。In fact, there are many elements which influence the special character, such as the intensity and frequency of the laser, the binding energy of atom, an additional field and so on
實際上，有許多因素會影響到諧波譜線的具體性質。例如：所加激光脈沖的強度和頻率，原子的電離勢以及外加的磁場或電場等。We studied the effects of pulse - shape, an additional static electric field and different initial states on ionization probability and hhg. we did so by representing the results of a series of numerical experiments on a one - dimensional model hydrogen atom
本文將採用數值計演算法來求解含時schrodinger方程，研究在一維氫原子模型中，外加的平行靜電場，不同形狀的激光脈沖以及原子處于不同初始態對諧波譜線和電離率的影響。The series of results showed that there is a close relationship between the ionization probability and the pulse - shape, which in turn affects the hhg. when the pulse is turned on very slowly or rapidly the character of hhg wo n ' t be obvious. only if the turn - on is proper the spectrum of hhg will be ideal
當激光脈沖的時間長度不變時，脈沖開啟的快慢會影響到電離率和高次諧波，開啟很慢或很快時，諧波的平臺結構都不明顯；只有在適當的開啟下，電離率處于中間值，這時高次諧波譜線才比較理想。分享友人