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- The experimental tests involved the total sound power level, the sound pressure spectra and the sound source directivity of the AFF are firstly presented. 本文首先進(jìn)行了軸流風(fēng)扇總聲功率、聲壓頻譜及聲源指向性等聲學(xué)特性的實(shí)驗測試。
- On the basis of this solution, this paper gives the sound pressure spectrum densities of broad band and harmonic sources, and then discusses the characteristics of these sound fields respectively in detail. 在此解基礎上，本文得到寬頻源和簡(jiǎn)諧源的近場(chǎng)聲壓譜密度，指出此2種聲源近聲場(chǎng)各自的特點(diǎn)及源的旋轉半徑和軸向位置對聲場(chǎng)結構的影響。
- Measurement of sound pressure level for sound sign. 海船聲號器具的聲壓級測量。
- pressure spectrum level 壓譜級
- Usually, the problem is how to reduce the sound pressure level, either at source or on the transmission path. 通常噪聲問(wèn)題的解決辦法就是在其聲源處或是在其傳播途中降低其聲壓水平。
- The spectrum level of microseismic noise tends to peak at about 1/6 Hz. 微震的噪聲譜在1/6赫趨于峰值。
- The audible sound pressure range is from 0 dB to 120 dB. 聽(tīng)覺(jué)范圍為0分貝到120分貝。
- The spectrum level of microseismic noise tends to peak at about 1/6 Hz . 微震的噪聲譜在1／6赫趨于峰值。
- Ultra-low distortion at extreme sound pressure levels. 超低失真的極端聲壓級。
- Sound Pressure Level (SPL) Sound pressure level is a measurement of the pressure fluctuations of a sound wave as it propagates through the air. 聲壓級別聲壓級別是表示在空氣中傳播的聲波的起伏壓。
- Objective To study the change and significance of GFAP in thebrain of the mice exposed to infrasound of different sound pressure level . 目的研究不同聲壓級次聲作用小鼠后腦中膠質(zhì)纖維酸性蛋白(GFAP)的改變和意義。
- Conclusion The extent of GFAP change is closely related to the action times under infrasound of same sound pressure level. 結論馬、皮質(zhì)和下丘腦等區域對次聲敏感，次聲的作用效應與聲壓級和作用時(shí)間有關(guān)；
- This system can be used to calculate the aircraft take-off, approach and side-line noise( EPNL) for the purpose of aircraft noise certification, and to calculate the sound pressure and spectrum at airframe surface in cruise flying. 該軟件除可預測飛機適航噪聲審定的起飛、場(chǎng)和邊線(xiàn)有效感覺(jué)噪聲級外,還可計算巡航過(guò)程機體表面聲壓分布。
- The loudness in the hall is introduced and the investigated results are analyzed by the strength and LpF which is the mean sound pressure level of tutti-sound. 介紹了廳堂響度的評價(jià)指標,然后利用強度指數和廳堂樂(lè )隊齊奏強音標志樂(lè )段的平均聲壓級LpF對現有的廳堂調研結果進(jìn)行分析。
- INTRACRANIAL SOUND PRESSURE LEVELS DURING IMPULSSE NOISE EXPOSURE Saljo A. 在噪音刺激下顱內聲音壓力水平。
- A sound level meter measures sound pressure level.It has several frequency-weighted decibel (dB) scales (A, B, C) to cover different portions of the range of measured loudness. 聲級表是用來(lái)測量聲壓級別的，它根據聲音的頻率分為幾個(gè)分貝級（A, B, C）。
- In this paper, a cab is analyzed with SYSNOISE for the sound pressure level (SPL), structural mode participation factors and acoustic mode participation factors in the cavity. 在計算實(shí)例中，計算了由于汽車(chē)發(fā)動(dòng)機振動(dòng)引起的車(chē)內噪聲的聲壓級、結構模態(tài)的振動(dòng)參與因子和聲學(xué)模態(tài)的參與因子，分析了引起車(chē)內噪聲的主要原因。
- After two-grade demarcate, the A/B/C sound pressure level, the gross sound pressure level and the sound power level are produced with the application of A, B, C level fuzzy net. 通過(guò)二級標定，引入A、B、C三檔模糊計權網(wǎng)絡(luò )，生成A、B、C三檔聲級及總聲級，求取聲功率級，進(jìn)而依據三段評判對噪聲進(jìn)行進(jìn)一步的評判。
- spectrum level of underwater noise 水下噪聲譜級
- There is a remarkably wide range of frequencies and sound pressure levels over which the human ear can detect. 人類(lèi)耳朵對聲音頻率和聲壓級的感應范圍很廣。
