Good practice on ventilation system noise control 控制通風(fēng)系統(tǒng)噪音的優(yōu)良手法
Good practice on pumping system noise control 控制抽水系統(tǒng)噪音的優(yōu)良手法
The parallel termination can effectively suppress overshoot and undershoot that makes the signal swing less and the system noise tolerance larger 戴維南并行端接可以有效地抑制過(guò)沖和欠沖,使得信號(hào)的擺幅縮小,增強(qiáng)了系統(tǒng)的噪聲容限。
The major noise resources of high - speed railway vehicles ( v 200km / h ) are wheel - rail rolling noise , structure noise , aerodynamic noise and collector system noise 高速鐵道車輛(時(shí)速200km h )的噪聲源主要是:輪軌噪聲、構(gòu)造物噪聲、集電系噪聲和空氣動(dòng)力性噪聲。
The reduction of exhaust system noise is the key to the reduction of automobile noise . at present , the main method to reduce exhaust noise is by setting muffler in automobile exhaust system 減小排氣噪聲是降低汽車噪聲的關(guān)鍵,目前在排氣系統(tǒng)中安裝排氣消聲器是減少排氣噪聲的主要方法。
Although the above two methods own pretty good filtering performance when system noise and observation noise are non - gaussian , their filtering performance will descend or even diverge when non - gaussian distribution occurs 上述兩種方法在當(dāng)系統(tǒng)噪聲和觀測(cè)噪聲滿足高斯分布特性的時(shí)候具有較好的濾波性能,而對(duì)于非高斯分布噪聲上述濾波方法的指標(biāo)下降,甚至出現(xiàn)發(fā)散。
First , this paper systematically and entirely analyzes the hvac - related noise sources , and briefly presents the generating mechanisms of noise in some air - conditioning equipments , and illustrates the propagation of system noise in building interior 首先,本文比較系統(tǒng)、全面地分析了hvac系統(tǒng)存在的噪聲源,并對(duì)部分空調(diào)設(shè)備的發(fā)聲機(jī)理進(jìn)行了簡(jiǎn)單地說(shuō)明,同時(shí)還闡述了系統(tǒng)噪聲在建筑內(nèi)部的傳播。
As for speed - sensorless foc system , the convergence and precision of both rotor speed and flux estimation with ekf depend on the accuracy of the models of system noise and measurement noise , i . e . q and r . genetic algorithm ( ga ) is applied in this paper to optimize parameters of the extended kalman filer ( ekf ) filter in a speed - sonserless field - oriented controller ( foc ) system 卡爾曼濾波估計(jì)實(shí)現(xiàn)的難點(diǎn)是,電機(jī)運(yùn)行系統(tǒng)噪聲和測(cè)量噪聲的模型不易獲得,而卡爾曼濾波器的收斂性和估計(jì)的精度在很大程度上受其影響,本文采用遺傳算法對(duì)卡爾曼濾波器的輸入?yún)?shù)進(jìn)行離線優(yōu)化。
On the basis of increasing the flaw resolution of the x - ray radiographic system , the study is firstly concerned with the analysis made on the influence of such factors as redial sources energy , system noise , optics radiography and scattering on the radiographic system in theory , and the present dissertation looks at the methods for acquiring the radiographic system point sp read function , line spread function and module transfer function ( mtf ) . on the basis of these studies , research the spread properties of the tiny flaw making use of mtf , acquiring the properties of system inspecting sensitivity and resolution , based on the system optimization designing 本文以提高射線成像系統(tǒng)的疵病分辨率為前提,首先在理論上對(duì)射線源能量、系統(tǒng)噪聲、光學(xué)成像、散射等各環(huán)節(jié)對(duì)成像系統(tǒng)的影響進(jìn)行分析,探討成像系統(tǒng)的點(diǎn)擴(kuò)展函數(shù)、線擴(kuò)展函數(shù)及其調(diào)制傳遞函數(shù)( moduletransferfunction ,簡(jiǎn)稱mtf )獲取方法,在此基礎(chǔ)上,利用mtf研究微小疵病的擴(kuò)展特點(diǎn),從而得到系統(tǒng)的檢測(cè)靈敏度和分辨率給出關(guān)系特性,為系統(tǒng)優(yōu)化設(shè)計(jì)提供依據(jù)。
Based on the information fusion estimation theory , various information fusion structures and their algorithms are summarized , including centralized , decentralized , fusion mode and all - information mode . various kalman filters in the case of correlative infonnation arc summarized , including those with the correlation of measuring noise and system noise , those with colored noise and those in the case of one filter stimulating another . mathematical simulation results , as shown in figures 4 . 3 through 4 . 5 , testify the validity of solving the problem of one filter stimulating another by using the method of prolonging fusion period 基于信息融合估計(jì)理論,研究和總結(jié)了多傳感器系統(tǒng)中的各種信息融合結(jié)構(gòu)及其算法,包括集中式、分散式、融合式和全信息融合方式;研究和總結(jié)了各種相關(guān)信息情況下的kalman濾波,包括量測(cè)噪聲與系統(tǒng)噪聲相關(guān)時(shí)的kalman濾波、有色噪聲條件下的kalman濾波和濾波激勵(lì)濾波條件下的kalman濾波。