spectrum density 中文意思是什麼
spectrum density
解釋
頻譜密度-
We acquired the system ' s dynamic response when the satellite attitude was adjusted and the mode of the antenna. then modal analysis and dynamic analysis have been done to the satellite - antenna system by using the finite element analysis ( fea ) software of ansys. through the analysis we got the system ' s connatural characteristic, the amplitude - frequency characteristic of harmonic response, the power spectrum density of random vibration response, the maximal amplitude and resuming time of impact response
其次藉助ansys有限元分析軟體，對系統進行了模態分析和動力學響應分析，獲得了不同天線結構參數下的衛星?天線系統的固有特性，簡諧響應的幅頻特性，隨機振動響應的功率譜密度，以及沖擊響應的最大幅值和恢復時間等。 -
Object ' s through signature simulation based on power spectrum density estimation
基於功率譜估計的艦船噪聲特徵提取及聲場通過特性模擬 -
To solve it, the differential equation set is transformed by fourier transform and the dynamic differential equation in the form of matrix is educed. the calculation formulas of frequency response function of vehicle vibrating system, acceleration power spectrum density function are put forward
用分析力學法建立整車動力學模型，推導出以矩陣形式表示的運動微分方程，並通過傅氏變換給出汽車動力學系統的頻率響應函數、加速度功率譜密度函數的計算公式。 -
In the first session the fans vibration on - line monitoring system is realized with vc language, also compile auto power spectrum density function, cross power spectrum density function, autocorrelation function and cross correlation function etc spectral analysis function to carry through simple offline fault diagnosis
首先用穩定性強、擴展性好的vc + +語言開發了通風機振動在線監測系統，並編寫了自功率譜密度函數、互功率譜密度函數、自相關函數和互相關函數等頻譜分析函數來進行簡單的離線故障診斷。 -
Phase noise power spectrum density
相位躁聲功率頻密度 -
The measurement was made on a gas - solid fluidized bed in our laboratory. the pressure fluctuation signals were obtained and analyzed through power spectrum density. the relation of the particle size to pressure fluctuation and other parameters was studied by using fuzzy set theory
在實驗室條件下對氣-固流化床的顆粒進行了測量，通過功率譜密度對所獲得的壓力波動進行了分析，並應用模糊集理論對顆粒尺寸與壓力波動及其它影響參數的關系進行了研究。 -
In the end of this chapter, the power spectrum density ( psd ) analysis of hrg is given, which shows that the main noise of hrg is low frequency noise
論文還對陀螺信號進行了功率譜密度分析，分析結果表明陀螺的主要誤差都集中在低頻段。 -
Further more, power spectrum density ( psd ) of each test section was analyzed, and its experiential formula was given. combined with experiential the formula of coherence function, the mathematic model for calculating the caarc standard tall building ' s wind - induced response was set up
進一步擬合了順風向和橫風向各測點層層風力譜的經驗公式，並給出了以此為基礎的計算caarc標模風振響應的流程，從而建立起完整的標模風振響應以及等效荷載計算的數學模型。 -
Through the i 、 q component of ipix radar sea clutter data " s histogram analyses and by skewness and kurtosis computed, it is been shown that sea clutter amplitude is not rayleigh distribution ; through the comparison of amplitude histogram and distributed models with the same parameters, it is been shown that hh polarization clutter is lognormal distribution, whereas vv polarization is k - distribution ; at the same time the correlation function and power spectrum density are been analyzed, at last the correlation compound k - distribution stochastic sequences whose covariance matrix is been given are been generated through sirp algorithm
文中先介紹了海雜波幅度的有關模型，通過對ipix雷達海雜波數據的i 、 q分量的直方圖以及傾斜度和峰度進行了分析和計算，證明了海雜波幅度不服從瑞利分佈;使用幅度直方圖和相同參數下的各種分佈模型進行比較，得出hh極化符合對數正態分佈，而vv極化服從k -分佈的結論;同時對海雜波的相關函數和功率譜進行了分析，最後使用sirp演算法產生了給定協方差矩陣的相關復合k -分佈隨機序列。 -
For the next, it studies the theory of auto - cross spectrum density method and stochastic subspace identification method
其次，研究了自互譜法和隨機子空間法的理論。 -
Then we introduce pulse position modulation ( ppm ) using pn code and analysis its multi - access performance, system capacity and power spectrum density. on the basis of those analyses, we study the pulse shape and the anti - jamming ability of the system. at last, multiple access with pseudochaotic time hopping is introduce
本文首先闡述了uwb脈沖通信系統的基本原理，重點介紹了用偽隨機碼跳時的ppm （脈沖位置調制）調制，分析了他的多址性能、系統容量和功率譜密度，在此基礎上研究了改進性能的發射信號形狀和系統抗干擾能力，最後介紹了偽混沌碼跳時的多址方式。 -
The random excitation of the four wheels is used as the input of this system. the changing rule of vertical displacement, three directions of acceleration power spectrum density function of person - chair system of model ca - 141 and etc. in the frequency domain is simulated using matlab. the rationality of the model is analyzed and validated by comparing of relevant testing results and theoretic analysis
以頻域內四輪隨機激勵作為系統輸入，用matlab模擬低地板城市客車等三種車型人椅系統三向加速度功率譜的變化規律，逐項分析車速、懸架剛度與阻尼參數變化對車輛平順性的影響，通過與相關研究結果的比較及理論分析驗證了模型的合理性。 -
Aiming at the common problems about the incline of biochip image, the automatic image rotation correction is realized by analyzing the power spectrum density of image projection
針對生物晶元掃描圖象普遍存在的傾斜問題，利用圖象投影的能量譜密度，實現對傾斜圖象的自動校正。 -
As a classical and practical method in ambient vibration experimental modal analysis, auto - cross spectrum density method replace the frequency response function with power spectrum and achieve its mode shape from transmissibility between the response signals and reference signal
自互譜法作為環境激勵實驗模態分析的一種實用的經典方法，用響應點和參考點間的功率譜曲線來代替頻響函數曲線，並由響應點和參考點之間響應的傳遞率得出振型。 -
A sorting method of the helicopter noise sources is given. the temporal waveform and spectrum of the noise signature is analyzed. at last, the sound pressure spectrum density level is estimated with the experimental data taken from a specific navy helicopter
扼要闡述了直升機噪聲的產生和分類，考察了直升機信號的波形和頻譜特徵，並對特定的直升機噪聲的聲壓譜密度級進行了計算。 -
The formula based on spectrum density is given
推導出基於圖像頻譜密度的響應公式。 -
Power spectrum density
功率譜密度 -
At last, the validity and the superiority of boundary - spectrum are improved by contrasting with power spectrum density ( psd ) to analyze tested data
同時通過實驗信號的局域波邊界譜和功率譜分析比較，突出了局域波邊界譜分析的可行性和優點。 -
Additionally, since direct spread spectrum sequence ( dsss ) signal has an ultra - low power spectrum density, finding approaches to detect it and estimate its parameters in the non - cooperative communication system is a great challenge for applications
另外， dsss信號由於具有極低的功率譜密度，如何在非協作通信中不知道擴頻序列的前提下對其進行檢測和估計，是一個具有很強應用背景的課題。 -
The fluctuating omnidirectional wind pressure power spectrum density ( psd ) of some typical locations and the frequency domain coherence property of the fluctuating wind pressure between different tapping positions at different wind directions were measured and discussed
文中進一步測量並討論分析了屋蓋上典型測點脈動風壓的頻譜特性以及空間不同位置之間的相干特性。
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