helicopter noise 中文意思是什麼
helicopter noise
解釋
直升機噪音- helicopter : n 直升機。vt 用直升機載送。 helicopter sb aboard the ship 用直升機把某人送到船上。vi 乘直升機。n ...
- noise : n 1 聲音，聲響。2 叫喊；嘈雜聲，噪音；喧鬧聲；吵鬧，騷動，騷擾。3 〈古語〉謠言，風聲。4 〈美國〉...
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In chapter 5, the uh - 1 model rotor, the model rotor measured in the present work and the helicopter z - 8 rotor are taken as numerical examples, the calculations on rotor noise under different flight conditions are carried out for validation purposes
應用該模型，分別以uh - 1模型旋翼、本文試驗的模型旋翼以及z - 8直升機旋翼為算例，對不同飛行條件下的旋翼氣動噪聲進行了計算，驗證了本文的計算方法。 -
Then a low pass filter is designed to filter high - frequency noise in data. and smooth data again by means of central interpolation algorithm ; helicopter model with multi input single output are identified respectively in ls method and ml method
（ 2 ）剔除並補正了飛行實驗數據中的野值；設計了一個低通濾波器來濾除數據中的高頻噪聲；用中心插值演算法對數據二次平滑。 -
Since the spectrum of the helicopter noise contains wide band continuous component and narrow band line component, we can use the wide band signal detection method or narrow band signal detection method. both detection methods are discussed
直升機噪聲既含有寬帶連續譜成分，又有很強的窄帶線譜分量。根據直升機噪聲的特點，我們既可以採用寬帶能量檢測，又可以採用窄帶線譜來檢測直升機信號。 -
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。 -
Combining cfd technology and aeroacoustic theory in time domain, the high - speed impulsive ( hsi ) noise of helicopter rotor in hover and in forward flight was predicted and investigated
本文結合cfd （計算流體力學）技術與氣動噪聲時域理論，求解直升機旋翼懸停和前飛流場及流場氣動噪聲。 -
Pointing to the data obtained from semi - physical simulation of certain helicopter which mainly has low - frequency noise, a data - processing method of depressing and filtering noise from the signal, using the pagoda - structure re - constructing arithmetic and the wavelet transform principle, is proposed
摘要針對直升機半物理模擬測量數據主要是低頻噪聲的特點，提出利用小波變換、塔式結構重構演算法，對信號進行降噪濾波處理的方法。 -
By means of dual - time stepping method and moving grids technique, we solved the 3 - d unsteady euler ' equations for helicopter rotor in forward flight, and obtained the near - field hsi noise
為了多槳旋翼旋轉、變距等復合運動的準確描述，採用了多塊分區運動網格技術。 -
For a conventional helicopter, the tail rotor is one of primary sources for helicopter noise
尾槳是直升機的主要噪聲源，降低尾槳噪聲對控制直升機的噪聲水平具有重要意義。 -
Chapter 4 presents the mechanism of helicopter tail rotor noise, developed a new analytical model to investigate the noise of tail rotor when helicopter fly forward
在第四章中，通過對直升機尾槳噪聲的機理分析，建立了前飛狀態下尾槳噪聲的計算模型。 -
A new method for predicting high - speed impulsive noise generated by a helicopter rotor
預測直升機旋翼氣動噪聲的新方法 -
The theoretical deduction in chapter 3 shows that the shape of load distribution used in the arithmetic is a decisive fact of the error margin size, the more the adoptive shape looks like the actual case, the smaller the error margin will be, therefore the tilt parabola shape can instead of the actual shape of load distribution in the permissible error margin when we predicting constant loading noise caused by the tail rotor of helicopter
在第三章中通過理論推導和計算比較發現，在預測直升機尾槳定常載荷噪聲時，其誤差大小取決于演算法中槳葉弦向載荷分佈的數學描述與實際弦向載荷分佈的吻合程度，而選取一種與實際弦向載荷分佈較為相似的斜拋物線形來預測噪聲所導致的誤差是很小的。 -
In this thesis, the major contributions of the author ’ s research work are as follows : at first, the classification of helicopter tail rotor noise sources and the existent method of helicopter noise research is introduced briefly
本文採用諧波分析法對直升機前飛狀態下的尾槳噪聲進行了理論分析研究。主要工作包括:本文首先簡要介紹了直升機噪聲的分類以及國內外直升機噪聲研究方法的現狀，總結了前人的研究成果。 -
Because of the special structure of smart rotor, the problem, online secondary path modeling, should be solved when adaptive filter is used to actively control the helicopter vibration. auxiliary random noise is one of the resolve methods
出於智能旋翼結構的特殊性，在應用自適應濾波的方法進行主動控制時須解決次級通道在線建模問題。 -
2. analysis of the helicopter noise signature
對空氣中的直升機噪聲進行了分析。
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