spectrum density造句
例句與造句
- There is a focus on application of the stochastic subspace identification method in this article . for its defect in application of engineering , it also studies auto - cross spectrum density method which is classical in engineering , and it can be used as a supplement
針對隨機(jī)子空間法在工程應(yīng)用中耗時長的不足,本文還研究了工程應(yīng)用中比較經(jīng)典的自互譜法,該方法可以作為隨機(jī)子空間法的補(bǔ)充。 - The direct sequence spread spectrum ( dsss ) signal has been widely used in these years for its advantage of anti - jamming capability , good confidentiality and low power spectrum density . it has wide usage in mobile communications , radar , navigation and orientation
直接序列擴(kuò)頻( dsss )信號具有抗干擾性能好、保密性能好、功率譜密度小等特點(diǎn),近年來得到了迅速的發(fā)展,并被廣泛應(yīng)用于移動通信、雷達(dá)、導(dǎo)航和測量等多種領(lǐng)域。 - 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(huán)境激勵實(shí)驗(yàn)?zāi)B(tài)分析的一種實(shí)用的經(jīng)典方法,用響應(yīng)點(diǎn)和參考點(diǎn)間的功率譜曲線來代替頻響函數(shù)曲線,并由響應(yīng)點(diǎn)和參考點(diǎn)之間響應(yīng)的傳遞率得出振型。 - 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(shí)驗(yàn)室條件下對氣-固流化床的顆粒進(jìn)行了測量，通過功率譜密度對所獲得的壓力波動進(jìn)行了分析，并應(yīng)用模糊集理論對顆粒尺寸與壓力波動及其它影響參數(shù)的關(guān)系進(jìn)行了研究。 - 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(xué)法建立整車動力學(xué)模型，推導(dǎo)出以矩陣形式表示的運(yùn)動微分方程，并通過傅氏變換給出汽車動力學(xué)系統(tǒng)的頻率響應(yīng)函數(shù)、加速度功率譜密度函數(shù)的計(jì)算公式。 - It's difficult to find spectrum density in a sentence. 用spectrum density造句挺難的
- 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(jìn)一步擬合了順風(fēng)向和橫風(fēng)向各測點(diǎn)層層風(fēng)力譜的經(jīng)驗(yàn)公式，并給出了以此為基礎(chǔ)的計(jì)算caarc標(biāo)模風(fēng)振響應(yīng)的流程，從而建立起完整的標(biāo)模風(fēng)振響應(yīng)以及等效荷載計(jì)算的數(shù)學(xué)模型。 - 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
其次借助ansys有限元分析軟件，對系統(tǒng)進(jìn)行了模態(tài)分析和動力學(xué)響應(yīng)分析，獲得了不同天線結(jié)構(gòu)參數(shù)下的衛(wèi)星?天線系統(tǒng)的固有特性，簡諧響應(yīng)的幅頻特性，隨機(jī)振動響應(yīng)的功率譜密度，以及沖擊響應(yīng)的最大幅值和恢復(fù)時間等。 - 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(nèi)四輪隨機(jī)激勵作為系統(tǒng)輸入，用matlab仿真低地板城市客車等三種車型人椅系統(tǒng)三向加速度功率譜的變化規(guī)律，逐項(xiàng)分析車速、懸架剛度與阻尼參數(shù)變化對車輛平順性的影響，通過與相關(guān)研究結(jié)果的比較及理論分析驗(yàn)證了模型的合理性。 - 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(tǒng)的基本原理，重點(diǎn)介紹了用偽隨機(jī)碼跳時的ppm (脈沖位置調(diào)制)調(diào)制，分析了他的多址性能、系統(tǒng)容量和功率譜密度，在此基礎(chǔ)上研究了改進(jìn)性能的發(fā)射信號形狀和系統(tǒng)抗干擾能力，最后介紹了偽混沌碼跳時的多址方式。 - 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(wěn)定性強(qiáng)、擴(kuò)展性好的vc + +語言開發(fā)了通風(fēng)機(jī)振動在線監(jiān)測系統(tǒng)，并編寫了自功率譜密度函數(shù)、互功率譜密度函數(shù)、自相關(guān)函數(shù)和互相關(guān)函數(shù)等頻譜分析函數(shù)來進(jìn)行簡單的離線故障診斷。 - 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(guān)模型,通過對ipix雷達(dá)海雜波數(shù)據(jù)的i 、 q分量的直方圖以及傾斜度和峰度進(jìn)行了分析和計(jì)算,證明了海雜波幅度不服從瑞利分布;使用幅度直方圖和相同參數(shù)下的各種分布模型進(jìn)行比較,得出hh極化符合對數(shù)正態(tài)分布,而vv極化服從k -分布的結(jié)論;同時對海雜波的相關(guān)函數(shù)和功率譜進(jìn)行了分析,最后使用sirp算法產(chǎn)生了給定協(xié)方差矩陣的相關(guān)復(fù)合k -分布隨機(jī)序列。 - The mode number and the frequencies range , which were considered during calculating the wind - induced responses of large cantilevered roof by using the method of frequency domain , were analysed and discussed , according to the results of wind tunnel tests of bahamas and guinea stadium grandstand cantilevered roofs , and the rules that rms displacement and rms internal force responses under strong wind force changing with participant modes number and frequencies range were obtained , and which could be explained from the point of wind pressure power spectrum densities of the measured points on surface of the roof
摘要根據(jù)援巴哈馬體育場和援幾內(nèi)亞體育場主看臺懸挑屋蓋風(fēng)洞試驗(yàn)數(shù)據(jù)結(jié)果，分析和探討了采用頻域分析法計(jì)算大跨度懸挑屋蓋風(fēng)振響應(yīng)時應(yīng)考慮的結(jié)構(gòu)模態(tài)數(shù)和頻率范圍，得到強(qiáng)風(fēng)作用下懸挑屋蓋結(jié)構(gòu)均方根位移與內(nèi)力響應(yīng)隨參與計(jì)算的模態(tài)數(shù)和頻率范圍的變化規(guī)律，并從屋蓋表面測點(diǎn)風(fēng)壓譜密度的角度解釋了這種變化規(guī)律。 - Direct sequence spread spectrum ( ds - ss ) system modulates a data sequence to a high speed pseudorandom ( pn ) sequence , which extends the bandwidth of the modulated signal while decreasing the power spectrum density . it is an advanced communication system with many excellent properties such as multiple access , low probability of interception , anti - jamming and so widely used
直接序列擴(kuò)譜通信是用一個高速的偽隨機(jī)序列調(diào)制一個數(shù)據(jù)序列,以展寬并降低信號的功率譜密度的一種先進(jìn)的通信體制,能獲得多址接入、低截獲特性和抗干擾能力,因此具有廣泛的應(yīng)用。
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