
[物] 功率譜密度
Power spectral density is an effective tool to evaluate random vibration in circulation environment.
功率譜密度是評價流通環境過程中隨機振動的有效工具。
In practical application, one of the difficulties is the adjustment of the power spectral density function to various soil conditions.
在實際應用中,調整功率譜密度函數以適應各類場地土仍是一項困難的工作。
In this paper, based on the random characteristic analysis of Tianjin Hospital Earthquake waves of Tangshan aftershock Three dimension acceleration power spectral density ratio have been presented.
根據唐山餘震時天津醫院實測地震波的隨機特性分析,提出了地面運動加速度三向功率譜密度的建議比值。
The random rail roughness samples are yielded using random numerical method and power spectral density function.
采用隨機數值模拟方法和功率譜密度函數生成隨機軌道粗糙度。
Based on the calculation of power spectral density of wavefront, the method of using PSD to evaluate the corrective ability of active thin primary mirror was proposed.
在分析波前功率譜密度(PSD)計算方法的基礎上,提出了采用PSD評價能動薄主鏡波前校正能力的方法,并給出了仿真結果。
Different types of digitally modulated signals that have similar, if not identical, power spectral density functions can have highly distinct spectral correlation functions.
一些不同的數字調制信號有着相同或相近的功率譜密度,但它們的譜相關函數卻有明顯區别。
In this paper, a random response analytical method, Power Spectral Density Method, for better estimation of sonic fatigue life is proposed.
為此,本文提出所謂功率譜密度法,完成了聲疲勞壽命估算的隨機響應分析。
The calculation results using simulated and measured irregularity indicate that the power spectral density function and the simulated method used here can reflect true condition of rail.
同時,采用模拟與實測兩種不平順樣本的計算結果表明,本文采用功率譜密度函數的模拟方法可以基本反映軌道的實際不平順情況。
The experimental results of the different aperture parameters and the power spectral density of wavefront slope are derived in the paper.
本文推導了采用不同孔徑參數的實驗結果,以及波前斜率的功率譜密度。
It is shown that the surface topography characteristics can be adequately described by the power spectral density (PSD) of the surface roughness.
研究表明,表面的拓撲特征可以用表面粗糙度的功率譜密度(PSD)來加以描述;
The power spectral density function of earthquake motion is usually used for the random response analysis of engineering structures in the frequency domain.
工程結構的隨機地震反應分析,常在頻域中用到地震動的功率譜密度函數。
This paper deals with stochastic characteristic of the wind speed, and gives an auto-regressive moving-average (ARMA) model for wind speed subjected to particular power spectral density.
該文針對風速隨機變化的特性,在風速統計特性研究的基礎上,用自回歸滑動平均(ARMA)方法建立了具有一定功率譜密度特性的風速模型。
A high degree of relationship was found between the power spectral density and thermal response index (TRI).
功率譜密度值與時域指标體溫反應指數(TRI)有極好的相關性。
Road irregularity, as a stationary stochastic process, is generally illustrated by power spectral density (PSD) in frequency domain.
道路隨機過程通用的描述方法為頻域的功率譜密度函數方法。
The correlation between the standard classified road power spectral density(PSD) and international roughness index(IRI) was discussed by using regressive analysis.
通過回歸分析的方法對标準分級道路功率譜密度與相應國際平整度指數之間的關系進行了研究。
But if above positive real condition is satisfied only within some frequency range, the convergence of FXLMS algorithm is dependent on the spreading of power spectral density of the reference signal.
若上述正實條件僅在某些頻帶上滿足,則FXLMS算法的收斂将依賴于參考信號功率譜密度的分布。
The wavefront power spectral density(PSD) is being adopted for specifying the large optical component employed in high power density solid-state laser for inertial confinement fusion(ICF).
波前功率譜密度(PSD)被用于評價慣性約束聚變(ICF)激光驅動器光學元件中頻段的波前誤差。
Firstly, the power spectral density function of refractive index is given including the effects of inner and outer scale of the turbulence.
首先,給出了包含大氣湍流内,外尺度效應的折射率功率譜密度函數。
The concept of equivalent noisy power spectral density is introduced in this paper.
文中提出等效噪聲功率譜密度的概念。
The wavefront power spectral density (PSD) is being adopted for specifying the large optical components employed in high power density solid state laser for inertial confinement fusion (ICF).
波前功率譜密度(PSD)被用于評價ICF激光驅動器光學元件在中頻區域的波前誤差。
The power spectral density of ship's motion is calculated based on ocean wave energy spectrum, and the movement spectrums of the ship's random motion are calculated and created.
根據海浪波能譜,計算了艦船搖蕩運動的功率譜密度和艦船的隨機搖蕩運動。
A novel method was proposed based on the total pressure of pitot tube and power spectral density.
通過分析皮托管動壓信號的方式,提出了一種基于功率譜密度分布的調節閥擾動信號分析新方法。
The basic theory of power spectral density was introduced.
闡述了功率譜密度的基本理論、如何獲得功率譜密度;
When a white noise interferes with the rotary disc system, a time series model and the power spectral density are put forward for determining the dynamic parameters of the real system.
提出用時間序列模型和功率譜密度,來确定實際系統的動态參數。
In this paper, the power spectral density of the wind speed which varies with height is given according to the field measurement of typhoon in Shanghai area.
文章根據上海地區台風的實測資料,提出了沿高度變化的風速功率譜密度,并應用隨機振動理論,計算了上海電視塔在台風作用下的風緻響應,取得了與實測值較為符合的結果。
|power spectrum density;[物]功率譜密度
功率譜密度(Power Spectral Density,PSD)是信號處理中的核心概念,用于描述信號功率在頻域上的分布特性。以下是詳細解釋:
功率譜密度表示信號的平均功率在不同頻率分量上的分布密度。簡單來說,它揭示了信號中哪些頻率成分攜帶了更多能量,常用于分析隨機信號或周期信號的頻域特征。
對于平穩隨機信號( x(t) ),其PSD可通過傅裡葉變換的自相關函數計算: $$ S{xx}(f) = lim{T to infty} frac{1}{T} left| X_T(f) right| $$ 其中:
通過PSD,工程師可以量化信號在不同頻段的能量分布,為系統設計(如濾波器參數選擇)提供關鍵依據。對于非平穩信號,需結合時頻分析(如小波變換)進一步研究。
本文将詳細解釋單詞 power、spectral 和 density,以及它們的組合詞 power spectral density。
解釋: Power 一詞表示能量的量度。在物理學和工程學中,它通常表示單位時間内的能量傳輸率。在電學中,它表示電路中的功率。
例句:
近義詞: energy、strength、force
反義詞: weakness、impotence
解釋: Spectral 一詞表示某一物理量隨頻率變化的分布情況。在物理學和工程學中,它通常表示某一信號的頻域特征。
例句:
近義詞: frequency、spectrum、wave
反義詞: time domain、amplitude
解釋: Density 一詞表示某一物質的密度或某一物理量在某一空間範圍内的分布情況。在物理學和工程學中,它通常表示某一物理量在某一空間範圍内的局部密度。
例句:
近義詞: mass、concentration、crowdedness
反義詞: sparsity、emptiness
解釋: Power Spectral Density (PSD)一詞表示某一信號的功率隨頻率變化的分布情況。在信號處理和通信中,它通常表示某一信號的頻域功率特征。
例句:
近義詞: frequency power、spectrum power、power spectrum
反義詞: time domain power、amplitude power
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