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1、-. z.附錄一:中文譯文消防系統(tǒng)運(yùn)行可靠性的估計(jì)在過去的三年中,美國(guó)國(guó)家標(biāo)準(zhǔn)技術(shù)研究所(NIST)已經(jīng)在研究開發(fā)一種新的加密標(biāo)準(zhǔn),以確保政府的信息安全。該組織目前正處于為新的先進(jìn)加密標(biāo)準(zhǔn)(AES)選擇一個(gè)或幾個(gè)算法或數(shù)據(jù)打亂公式的開放過程的最后階段,并計(jì)劃在夏末或秋初作出決定。此標(biāo)準(zhǔn)定明年實(shí)施。Richard W. Bukowski:體育,高級(jí)工程師,瑟斯堡建筑及消防研究實(shí)驗(yàn)室的MST,美國(guó)醫(yī)學(xué)博士20899-8642;Edward K. Budnick:體育,巴爾的摩休斯聯(lián)合公司副總裁 ,美國(guó)醫(yī)學(xué)博士21227-1652;Christopher F. Scheme1,克里斯托弗計(jì)劃1,巴爾
2、的摩休斯聯(lián)合公司化學(xué)工程師、美國(guó)醫(yī)學(xué)博士21227-1652; 前言 背景資料:為執(zhí)行特定功能而設(shè)計(jì)和安裝的美國(guó)消防計(jì)劃。例如,自動(dòng)噴水滅火系統(tǒng)目的在于控制或撲滅火災(zāi)。為此: 自動(dòng)滅火系統(tǒng)必須長(zhǎng)開,即能滿足火災(zāi)地所需水量達(dá)到控制或消滅火災(zāi),火災(zāi)探測(cè)系統(tǒng)是為了盡早提供火災(zāi)預(yù)警通報(bào)來通知樓人員安全逃生,并提供消防通知,使其他的消防組成部分開啟(例如,特殊滅火系統(tǒng)、排煙系統(tǒng))。兩種消防系統(tǒng)啟動(dòng)(檢測(cè))和(警報(bào))必須達(dá)到盡早報(bào)警。建筑防火墻的一般設(shè)計(jì)目的為:限制火災(zāi)蔓延的程度和保持建筑物的結(jié)構(gòu)的完整,以及在火災(zāi)發(fā)生時(shí)保護(hù)逃生路線的安全性。為了做到這一點(diǎn),特殊的消防系統(tǒng)必須按標(biāo)準(zhǔn)測(cè)試及保持特殊消防系統(tǒng)完
3、整性的特點(diǎn).。消防系統(tǒng)的組成部分如探測(cè)系統(tǒng)、自動(dòng)滅火系統(tǒng)、防火墻的可靠性,在于提高基于設(shè)計(jì)基礎(chǔ)上的聯(lián)合演習(xí)的細(xì)節(jié)分析的投入。在安全系統(tǒng)方面,有幾個(gè)可靠性要素包括有效和能使用的可靠性,運(yùn)行可靠性能提供一定程度的概率,即消防系統(tǒng)在需要時(shí)運(yùn)行。運(yùn)行可靠性能在特定的火災(zāi)情況下利用起特點(diǎn)成功完成起任務(wù)的一種檢測(cè)手段。前者是系統(tǒng)組成和可靠性的評(píng)估,而后者是系統(tǒng)設(shè)計(jì)適宜性的評(píng)估。這項(xiàng)研究的圍僅限于運(yùn)行可靠性的評(píng)估,其主要原因是在于來自文獻(xiàn)資料容的可靠性。除了這項(xiàng)業(yè)務(wù)區(qū)分可靠性和性能,無條件評(píng)估的可靠性和故障估計(jì)的研究圍也會(huì)在失控的火災(zāi)中列出。在該文件的后面將會(huì)提供這些條款的討論。 研究圍:這份文件中提供了關(guān)
4、于(1)火災(zāi)探測(cè)(2)有限圍的自動(dòng)滅火(3)防火墻的運(yùn)行可靠性和執(zhí)行可靠性的一些觀點(diǎn)。一般而言,火災(zāi)檢測(cè)的可靠性大都在于煙氣檢測(cè)或火災(zāi)報(bào)警系統(tǒng)。自動(dòng)噴頭構(gòu)成了大部分的自動(dòng)滅火的數(shù)據(jù),防火墻包括分區(qū)防火和圍墻的完整性。應(yīng)當(dāng)指出,在*些情況下,該文獻(xiàn)不會(huì)超出一般火災(zāi)探測(cè) 或自動(dòng)滅火的疇和要求假設(shè)具體類型消防系統(tǒng). 幾項(xiàng)研究報(bào)告估計(jì)了火災(zāi)探測(cè)的可靠性和自動(dòng)滅火系統(tǒng)計(jì)劃。然而,對(duì)被動(dòng)防火系統(tǒng)如防火分區(qū)的詳細(xì)評(píng)估很少被發(fā)現(xiàn),如根據(jù)有限的統(tǒng)計(jì)資料經(jīng)分析后,被用來歸納包括評(píng)估和不確定的關(guān)聯(lián)性等信息。后者的作用僅限于文獻(xiàn)資料在檢測(cè)和滅火時(shí)的評(píng)估。防火分區(qū)的可靠性也包括與之關(guān)聯(lián)的不可靠數(shù)據(jù)。這份報(bào)告列出了與放火
5、系統(tǒng)相關(guān)的可靠性原理。為了回顧分析和重要發(fā)展以及數(shù)據(jù)概括,在文獻(xiàn)檢索時(shí)被完成。該文獻(xiàn)中適用于噴頭、煙霧偵測(cè)系統(tǒng)可靠性的數(shù)據(jù)已經(jīng)被分析篩選。這些數(shù)據(jù)是描述防火系統(tǒng)運(yùn)行可靠性在均值和95%的置信區(qū)間時(shí)的可靠性??煽啃苑治龅脑碓谖墨I(xiàn)中的數(shù)據(jù)可靠性和相關(guān)分析上有很大的變化。基本上,可靠性是一種概率的估計(jì),即一個(gè)系統(tǒng)或其組成部分在一定時(shí)間按照設(shè)計(jì)正常運(yùn)行,其組成部分在正常運(yùn)行或預(yù)期壽命的時(shí)間中。這一時(shí)期是改寫”的一個(gè)組成部分,是每次測(cè)試都發(fā)現(xiàn)是運(yùn)行正常的一個(gè)時(shí)。因此,系統(tǒng)及其組成部件越經(jīng)常測(cè)試和維修保養(yǎng),他們就越為可靠。這種形式的可靠性就叫做無條件。 系統(tǒng)正常運(yùn)行的可靠性是無條件的概率的估計(jì)。有條件的
6、可靠性是對(duì)所提及的兩件事情的估計(jì),即發(fā)生火災(zāi)和消防系統(tǒng)成功運(yùn)行在同一個(gè)時(shí)間發(fā)生??煽啃怨烙?jì)并不認(rèn)為火災(zāi)發(fā)生的幾率是無條件的估計(jì)。涉及到運(yùn)行可靠性的其他兩個(gè)重要概念是安全故障和危險(xiǎn)故障。無火災(zāi)發(fā)生時(shí),消防系統(tǒng)卻運(yùn)行叫做安全故障。一個(gè)常見的例子就是一個(gè)煙霧探測(cè)器的假報(bào)警現(xiàn)象。發(fā)生火災(zāi)時(shí)而消防系統(tǒng)卻不起作用,這叫做危險(xiǎn)故障。在這項(xiàng)研究中不能有效使用的概率(1-可靠性估計(jì))稱為危險(xiǎn)故障?;馂?zāi)期間自噴系統(tǒng)不能運(yùn)行或者運(yùn)行系統(tǒng)不能控制或撲滅火災(zāi)都是這種類型的失誤。整個(gè)系統(tǒng)的可靠性取決于各個(gè)組成部分的可靠性及其相應(yīng)的失敗率,系統(tǒng)組成部分的相互依存性,安裝后系統(tǒng)及其組成部分在維修和測(cè)試時(shí)所出拒的評(píng)估??紤]到關(guān)
7、鍵的可靠性時(shí)也涉及到消防系統(tǒng)的性能。系統(tǒng)性能被定義為*一特定系統(tǒng)的能力,為完成其設(shè)計(jì)安裝的任務(wù)。例如:被評(píng)估為性能分離的系統(tǒng),是基于在火災(zāi)期間各個(gè)組成部分在保持建筑物的構(gòu)造和防止火災(zāi)蔓延時(shí)的作用。系統(tǒng)性能根據(jù)其各個(gè)組件控制火災(zāi)蔓延的程度來界定。性能可靠性評(píng)估所需要的數(shù)據(jù)在于,消防系統(tǒng)在一般和大規(guī)?;馂?zāi)情況下完成設(shè)計(jì)目的的程度,性能可靠性的數(shù)據(jù)通過復(fù)檢這些數(shù)據(jù)的來源。因?yàn)檫@些作用取決于顯示數(shù)據(jù)的容,因此,這不是*單方面的作用。各種類型系統(tǒng)失敗的原因通常分為幾大類:安裝錯(cuò)誤,設(shè)計(jì)錯(cuò)誤,制造/設(shè)備缺陷,缺乏保養(yǎng),超過設(shè)計(jì)限額和環(huán)境因素,有幾種方法可以利用以減少失敗的概率,這些方法包括:(1)冗余設(shè)計(jì)
8、,(2)積極監(jiān)測(cè)故障,(3)提供最簡(jiǎn)單的系統(tǒng)(即最少的部件)為解決危險(xiǎn),以及(4)一個(gè)設(shè)計(jì)檢驗(yàn)、測(cè)試、維修計(jì)劃。這些運(yùn)行可靠性的概念都是重要的,當(dāng)運(yùn)行可靠性評(píng)估在溫憲忠報(bào)道時(shí),因?yàn)樵?一分析中用到的資料,可靠性評(píng)估可能用到一個(gè)或多個(gè)上述概念,在這一圍閱讀這一文獻(xiàn)時(shí)可酌情處理,大部分?jǐn)?shù)據(jù)是從支持這份論文的文獻(xiàn)中獲取得,這些文獻(xiàn)卻符合在無條件運(yùn)行可靠性!文獻(xiàn)檢索文獻(xiàn)檢索是搜集各種類型消防系統(tǒng)可能性的數(shù)據(jù),這些數(shù)據(jù)被認(rèn)為與安全計(jì)劃有關(guān):自動(dòng)滅火,自動(dòng)檢測(cè),和消防隔離。文獻(xiàn)檢索的目的是獲得特殊系統(tǒng)的運(yùn)行可靠性評(píng)估,這些特殊系統(tǒng)中每一種類型的消防系統(tǒng)都為一般的居住物(如住宅,商業(yè)建筑和公用建筑)。信息來
9、源包括全國(guó)火災(zāi)事故的數(shù)據(jù)資料,美國(guó)國(guó)防部安全記錄工業(yè)和住房的特殊研究,工業(yè)保險(xiǎn)歷史記錄和檢查報(bào)告的公開文獻(xiàn)和試驗(yàn)數(shù)據(jù)。試點(diǎn)工作和火災(zāi)測(cè)試結(jié)果的報(bào)告只有在火災(zāi)探測(cè)、自動(dòng)滅火或者防火隔離計(jì)劃時(shí)被明確評(píng)價(jià)是被利用,測(cè)試系統(tǒng)用于資格核準(zhǔn)或列表,并且用于審查失效方式的資料,英國(guó)公布的數(shù)據(jù)也包括日本、澳大利亞和新西蘭在。常識(shí)多個(gè)基礎(chǔ)廣泛的研究報(bào)告指出,這份調(diào)查是關(guān)于火災(zāi)探測(cè)和滅火系統(tǒng)還有防火分區(qū)的可靠性。這些包括(1)火災(zāi)研究1996托比在英國(guó) (2)澳大利亞消防工程索引消防法改革中心、1996 (3)日本東京火災(zāi)統(tǒng)計(jì)匯編 東京消防處、1997 (四)日本研究消防系統(tǒng)根源的成果渡邊1979。托比消防研究所
10、致力于解決消防系統(tǒng)的可靠性和各組成部分的相互作用。德爾菲方法是一種用來揭示各個(gè)組成部分單獨(dú)使用時(shí)的可靠性估計(jì)。組成部分包括:火災(zāi)探測(cè)、報(bào)警系統(tǒng)、滅火系統(tǒng)、自動(dòng)排煙系統(tǒng)和被動(dòng)防火(如防火隔離)。澳大利亞消防工程指導(dǎo)守則提出了工程法規(guī)依據(jù)了新的工作標(biāo)準(zhǔn),即澳大利亞消防工程法規(guī)。在這個(gè)方法的指導(dǎo)下,為燃煙、燃燒但無火花的火焰、和燃燒又有火焰建立防火安全性能評(píng)估。消防系統(tǒng)的工作情況(即探測(cè)概率、滅火或控制火災(zāi))完全根據(jù)各個(gè)特殊系統(tǒng)運(yùn)行可靠性來預(yù)測(cè)。在這份指導(dǎo)手冊(cè)中可靠性評(píng)估來自一個(gè)專家小組而不是來自實(shí)際數(shù)據(jù)。最后,運(yùn)行可靠性的數(shù)據(jù)分別在日本被兩個(gè)不同的研究小組公布,一個(gè)研究小組涉及東京從1990-19
11、97年間的火災(zāi)事故評(píng)估東京消防處1997。另一個(gè)研究小組涉及日本全國(guó)從早期到 1978年為止的火災(zāi)事故報(bào)告評(píng)估研究渡邊 1979。表1概述了這些研究提供了可靠的估計(jì)。單獨(dú)的可靠性估計(jì)存在個(gè)別差異取決于這些估計(jì)所用的參數(shù)。因?yàn)橄老到y(tǒng)需要準(zhǔn)確預(yù)測(cè)未來的運(yùn)行性能,從這些研究上導(dǎo)致的可靠性變化,將引起結(jié)果的顯著改變。此外,不確定性伴隨著一種單一的可靠性評(píng)估或者在這些推導(dǎo)可靠性的方法中存在*種潛在的偏見,可能限制它們?cè)谙老到y(tǒng)中研究運(yùn)行可靠性或可靠性性能的指導(dǎo)作用。表1:消防系統(tǒng)運(yùn)行可靠性評(píng)估的公告(成功率)由于在一般的文獻(xiàn)中可靠性估計(jì)的使用性有限,審查文獻(xiàn)是擴(kuò)展了它的作用在(1)建立一個(gè)完善的原理,
12、該原理是關(guān)于被認(rèn)為能影響可靠性的三種策略,并且(二)確定并評(píng)價(jià)關(guān)系到單獨(dú)系統(tǒng)可操作性和故障率的一定數(shù)據(jù)。自動(dòng)滅火系統(tǒng)(即 灑水系統(tǒng))表2概述了一些研究報(bào)告估計(jì),評(píng)價(jià)實(shí)際火災(zāi)事故中自動(dòng)灑水系統(tǒng)滅火的運(yùn)行可靠性。作為一個(gè)群體,這些研究報(bào)告差異很大,在時(shí)間周期、房屋類型和詳細(xì)程度關(guān)系到火災(zāi)的類型和灑水系統(tǒng)設(shè)計(jì)。表2所顯示的自噴系統(tǒng)的運(yùn)行可靠性估計(jì)一般相對(duì)較高,而一些研究提出把火災(zāi)控制或火災(zāi)失效,作為可靠性評(píng)估的一部分,但該報(bào)告的數(shù)據(jù)卻并不一致。因此,運(yùn)行可靠性假定為限噴灑操作。評(píng)估也應(yīng)顯示價(jià)值圍,暗示不宜使用一個(gè)自噴系統(tǒng)可靠性而不注意數(shù)據(jù)的偏差和一般的從不同數(shù)據(jù)庫(kù)不確定性數(shù)據(jù)源相結(jié)合。原預(yù)算表2由可
13、靠性估計(jì)圍由81.13%到99.5%泰勒maybee,marryat。81%的偏低價(jià)值與泰勒的研究中和一些被kook估計(jì)過高的(即87.6%)的報(bào)告,這些出現(xiàn)重大偏差的數(shù)據(jù)在這些研究中使用。在這兩種研究中,發(fā)生火災(zāi)的次數(shù)十分少,并且在數(shù)據(jù)庫(kù)中不區(qū)分自動(dòng)滅火系統(tǒng)和其他的滅火系統(tǒng)。最終maybee和marryat報(bào)告中的99.5%高估計(jì)反映了自噴系統(tǒng)在檢查、檢測(cè)和維修是嚴(yán)謹(jǐn)?shù)暮陀邪缚苫摹T谧試娤到y(tǒng)可取得的數(shù)據(jù)中,另一個(gè)重要的限制是大部分的自噴系統(tǒng)包括記載噴水的事故。在這些研究中,很有限的事故數(shù)據(jù)也參考了快速反應(yīng)或適宜的噴水技術(shù)。在評(píng)估適宜噴水系統(tǒng)的可靠性時(shí)應(yīng)特別關(guān)注幾個(gè)因素,包括(1)允許復(fù)蓋圍
14、(2)供水能力較低(3)在火災(zāi)中無遙控或警報(bào)系統(tǒng)的潛力很大。基于此,還有與這些技術(shù)(如維修水平)相關(guān)的其他因素可以直接影響這些類型的自噴系統(tǒng)的運(yùn)行可靠性。另外,還需要解決這些問題時(shí)的系統(tǒng)數(shù)據(jù),但基于后來的觀察和一般住宅一般不太可能保持正常,一些旨在保證住宅自噴系統(tǒng)運(yùn)行可靠性的東西可能被降低。火災(zāi)探測(cè)或警報(bào)系統(tǒng)表3提供了一份關(guān)于用于住宅系統(tǒng)運(yùn)行可靠性分析的概述,評(píng)估包括平均可能性和95%的置信區(qū)間都是基于HALL1955提供的數(shù)據(jù)所預(yù)估的。平均可靠性估計(jì)的圍從68%至88%不等。這些標(biāo)準(zhǔn)同托比德爾菲研究所所提供的可靠性數(shù)字相一致。然而,95%的置信區(qū)間的一般圍為66%至90%。表3:煙霧探測(cè)器的
15、可靠性分析HALL,1955防火分區(qū)依靠各種類型器材的功能例如:門(包括固定器材)、墻壁、地板/天花板、滲透孔、玻璃窗、防火卷簾、防煙材料和建筑物。當(dāng)防火分區(qū)被認(rèn)為是防火計(jì)劃中的重點(diǎn)時(shí),在文獻(xiàn)中有很少的數(shù)據(jù)認(rèn)為單個(gè)組成部分的運(yùn)行作用于防火分區(qū)。單個(gè)為建筑的評(píng)估和運(yùn)行可靠性在WARRIGTON的研究中和澳大利亞消防工程索引中被提到。但這些評(píng)估是完全基于專家的判斷。因此不會(huì)提供更加深入的分析。統(tǒng)計(jì)數(shù)據(jù)和不可靠估計(jì)文獻(xiàn)資料概括了先前部分提供的描述自動(dòng)噴水系統(tǒng)和火災(zāi)探測(cè)可靠性評(píng)估的信息和數(shù)據(jù)。自動(dòng)噴水系統(tǒng)可靠性的數(shù)據(jù)有幾個(gè)出處,火災(zāi)探測(cè)的可靠性評(píng)估僅來自一個(gè)會(huì)議,HALL1944。這個(gè)會(huì)議包括十年(1
16、983-1992)的可靠性評(píng)估和列出了在文獻(xiàn)中搜到的綜合可靠性研究。這份文件的最初一個(gè)目標(biāo)是提供一個(gè)關(guān)于所研究的系統(tǒng)運(yùn)行可靠性評(píng)估的預(yù)覽。 為自噴系統(tǒng)和火災(zāi)探測(cè),它基于現(xiàn)實(shí)數(shù)據(jù)做了一個(gè)統(tǒng)計(jì)分析。自動(dòng)噴水系統(tǒng)分析表2中關(guān)于自動(dòng)噴水系統(tǒng)可靠性分析,是根據(jù)每一種居住類型來分析的。應(yīng)當(dāng)指出,只有一個(gè)出處MILNE,1959提供了關(guān)于公共建筑和居住房屋的可靠性估計(jì),并且這些早期數(shù)據(jù)沒有提供現(xiàn)代住宅噴頭技術(shù)的可靠性數(shù)據(jù)。圖1的分布直方圖列出了每一個(gè)住宅類型的可靠性估計(jì)。平均值和95%的置信區(qū)間的限制是適合一般住宅(在研究中不區(qū)分商業(yè)建筑、住宅建筑和公共建筑的類別)和商業(yè)建筑,并且適用于綜合樓(商業(yè)、公共建
17、筑、住宅類)的可靠性評(píng)估。這些結(jié)果列在表4。圖1:自動(dòng)噴水系統(tǒng)對(duì)各種住宅類型的可靠性評(píng)估關(guān)于商業(yè)建筑和公共建筑可靠性評(píng)估的平均值控制在其他住宅類型的95%置信區(qū)間。適宜居住和公共建筑的單個(gè)點(diǎn)估計(jì),增加了一些與運(yùn)行可靠性有用的東西,也增加了數(shù)據(jù)庫(kù)的容量。用18估計(jì)四個(gè)獨(dú)立的門類。然而,關(guān)于住宅和公共建筑的點(diǎn)估計(jì)不應(yīng)單獨(dú)使用而作出任何結(jié)論。關(guān)于商業(yè)建筑、住宅和綜合建筑的可靠性估計(jì)提供了一些有用的信息。基于對(duì)噴淋系統(tǒng)分析的可利用數(shù)據(jù)是運(yùn)行的可靠性估計(jì)超過88%,如果不考慮商業(yè)建筑,噴淋系統(tǒng)的可靠性可達(dá)到92%以上。然而,判斷這種特殊的噴淋系統(tǒng)與那些評(píng)估中提到系統(tǒng)是否相似是十分重要的。商業(yè)建筑的的可靠
18、性圍在80%至98%,而一般建筑的為94%至98%。火災(zāi)探測(cè)系統(tǒng)分析關(guān)于火災(zāi)探測(cè)系統(tǒng)可靠性估計(jì)的數(shù)據(jù)是全面的。這份數(shù)據(jù)跨越了十年,并且每年都做可靠性評(píng)估報(bào)告(反映在表3),它為了各種不同用途的房屋而完成。這里的分析根據(jù)房屋的用途把它們分為幾個(gè)建筑等級(jí)。每種用途的房屋得出數(shù)據(jù)后,然后計(jì)算每種房屋的可靠性估計(jì)。圖2顯示了所有煙霧探測(cè)器關(guān)于全部住宅類型的可靠性估計(jì)。圖2:煙霧探測(cè)器對(duì)各種住宅類型的可靠性估計(jì)如直方圖中所示,數(shù)據(jù)有一個(gè)雙態(tài)分布。因此,為了進(jìn)一步研究?jī)蓚€(gè)平均值完全不同的數(shù)據(jù)庫(kù),進(jìn)行了一個(gè)方差(變異數(shù))分析。變異數(shù)檢測(cè)了可靠性估計(jì)的平均值和對(duì)一個(gè)給定建筑類型的可靠性影響。圖形代表性的變異數(shù)
19、以最小二乘法的形式在圖3中體現(xiàn)。變異數(shù)影響最終結(jié)果。如圖3所示,三種住宅分類分別有不同的關(guān)于煙霧探測(cè)起的平均可靠性估計(jì)。圖4中包含的直方圖分別描述了每種住宅類型的可靠性估計(jì)。圖3:煙霧探測(cè)系統(tǒng)對(duì)各種住宅類型的可靠性分析時(shí)變異數(shù)的影響這些住宅類型分別在平均可靠性估計(jì)和95%的置信區(qū)間估計(jì)進(jìn)行單獨(dú)分析。結(jié)果列于表5,每種類型的結(jié)果明顯不同。各種住宅類型的置信區(qū)間與自噴系統(tǒng)的可靠性估計(jì)時(shí)的置信區(qū)間不重疊。這就可能使有更多的數(shù)據(jù)用于煙霧探測(cè)器的分析,列于表5中各個(gè)住宅類型的煙霧探測(cè)器的可靠性估計(jì)完全不同,判斷非相關(guān)數(shù)據(jù)差異的原因超出了這個(gè)分析的圍。分析中所用到的數(shù)據(jù)是在研究中描述為典型系統(tǒng)的,在公開文
20、獻(xiàn)中關(guān)于噴淋系統(tǒng)和煙霧探測(cè)器可靠性的最好數(shù)據(jù)。典型數(shù)據(jù)是一種重要的依據(jù),它用來判斷*種類型的信息是否達(dá)到這種類型的統(tǒng)計(jì)學(xué)分析。分析的結(jié)果應(yīng)該被用來做出推論,但必須在研究相關(guān)資料和測(cè)驗(yàn)它們對(duì)分析系統(tǒng)中使用的特殊安全計(jì)劃的適應(yīng)性以后。然而,總體的接近代表著在解決不同消防系統(tǒng)類別的可靠性時(shí)更高的標(biāo)準(zhǔn),包括注意報(bào)告數(shù)據(jù)中的不確定性和偏差。圖4:煙霧探測(cè)器對(duì)各種住宅類型的可靠性分析分配概要和結(jié)論一份詳細(xì)的文獻(xiàn)摘要和運(yùn)行可靠性分析被用來關(guān)注幾個(gè)消防計(jì)劃的運(yùn)行可靠性,消防計(jì)劃包括:火災(zāi)探測(cè)、自動(dòng)噴水和防火分區(qū)。在這項(xiàng)研究中,運(yùn)行可靠性被定義為消防系統(tǒng)在需要時(shí)運(yùn)行的可靠性估計(jì)。這些出版物的標(biāo)準(zhǔn)不直接在評(píng)估中敘
21、述不確定性或偏差。關(guān)于防火分區(qū),在表1中的運(yùn)行可靠性概述是它的唯一信息。在試圖解決評(píng)估中的不確定性過程中,幾個(gè)火災(zāi)的實(shí)際細(xì)節(jié)研究,煙霧探測(cè)器和自動(dòng)噴水系統(tǒng)的運(yùn)行性能被重新分析,并且報(bào)告數(shù)據(jù)被提取為一個(gè)更加條理的評(píng)價(jià)。沒有發(fā)現(xiàn)防火分區(qū)的相關(guān)數(shù)據(jù),這個(gè)評(píng)價(jià)包括利用常規(guī)統(tǒng)計(jì)方法來評(píng)價(jià)可靠性數(shù)據(jù)和運(yùn)行可靠性的平均估計(jì),還有運(yùn)行可靠性達(dá)到95%的置信區(qū)間圍。表4和表5概括了這個(gè)分析的結(jié)果。測(cè)試結(jié)果顯示,使用單一標(biāo)準(zhǔn)來評(píng)估一個(gè)消防系統(tǒng)的運(yùn)行可靠性是不恰當(dāng)?shù)?。例如,在?中對(duì)噴淋系統(tǒng)的運(yùn)行可靠性評(píng)估,在商業(yè)建筑中圍從88%至98%,同時(shí)平均估計(jì)為93%,人口數(shù)量太少(單值)為計(jì)算平均價(jià)值和住宅或公共建筑的置
22、信區(qū)間的限制,但綜合樓計(jì)算的平均可靠性估計(jì)為95%,同時(shí)95%的置信區(qū)間為92%至97%,平均價(jià)值應(yīng)用到可靠性上,基于這個(gè)認(rèn)識(shí)即價(jià)值代表95%置信區(qū)間的平均圍,它是比較合理的與用來任意衍生的價(jià)值相比。另外,整個(gè)置信區(qū)間的使用和不是最可能的平均值相比,當(dāng)比較系統(tǒng)時(shí)有更加明顯詳實(shí)的信息,因?yàn)樗械南嗨葡到y(tǒng)的可靠性評(píng)估包括比較。這是當(dāng)拿一個(gè)系統(tǒng)同其他許多系統(tǒng)相比較時(shí)一個(gè)公認(rèn)的統(tǒng)計(jì)方法。煙霧探測(cè)器在表5中的運(yùn)行可靠性值有一個(gè)與95%置信區(qū)間相關(guān)聯(lián)的更為緊湊的圍。這可能是數(shù)據(jù)庫(kù)的大小和質(zhì)量以及通過HALL1995來保持結(jié)果的最初說明的一致性所導(dǎo)致的直接后果?;诒?中所體現(xiàn)的結(jié)果,煙霧探測(cè)器的平均值為,
23、對(duì)商業(yè)建筑為72.5%(下界70.2%,上界為73.7%),對(duì)住宅為77.8%(下界75.1%,上界為80.6%),對(duì)公共建筑為83.5%(下界82.3%,上界為84.6%)。煙霧探測(cè)器可靠性的變異結(jié)果進(jìn)一步表明可靠性估計(jì)由為數(shù)據(jù)分析的住宅類型決定(見圖3),煙霧探測(cè)器的最高可靠性與公共建筑有關(guān)。這可能是許多的公共建筑需要更多的維護(hù)和日常系統(tǒng)需求保證的直接后果。這一分析方法能很容易的應(yīng)用到其他消防系統(tǒng)的運(yùn)行可靠性評(píng)估。但是,應(yīng)當(dāng)指出文獻(xiàn)中數(shù)據(jù)的可靠性是一個(gè)重要的因素。值得注意的是數(shù)據(jù)在容和形式上的巨大變化,在學(xué)習(xí)報(bào)告和研究時(shí)這是努力的一部分。這項(xiàng)研究提供了一個(gè)十分廣泛的初步嘗試去描述消防系統(tǒng)的
24、運(yùn)行可靠性。調(diào)查報(bào)告需要大量的數(shù)據(jù)來改變數(shù)據(jù)庫(kù)。這種努力的重心在取得更加具體的數(shù)據(jù),系統(tǒng)的廣泛人口能為消防系統(tǒng)運(yùn)行可靠性的巨大改善提供基礎(chǔ),從而引起設(shè)計(jì)工程師的興趣,另外這項(xiàng)技術(shù)對(duì)工程師基于高速發(fā)展的設(shè)計(jì)理念的性能分析也是必要的。外文出處:.docin./p-262843630.html-. z.附錄二:外文資料原文-. z.Estimates of the Operational Reliability of Fire Protection SystemsFor the past three years,the National Institute of Standards and Tech
25、nology (NIST) has been working to develop a new encryption standard to keep government information secureThe organization is in the final stages of an open process of selecting one or more algorithms,or data-scrambling formulas,for the new Advanced Encryption Standard (AES) and plans to make adecisi
26、on by late summer or early fallThe standard is slated to go into effect ne*t year Richard W. Bukowski,P.E. Senior Engineer MST Building and Fire Research Laboratory Gaithersburg,MD 20899-8642 USA Edward K. Budnick,P.E.,and Christopher F. Scheme1 Vice President Chemical Engineer Hughes Associates,Inc
27、 Hughes Associates,Inc. Baltimore,MD 21227-1652USA Baltimore,MD 2 1227-1652USA INTRODUCTION BackgroundFire protection strategies are designed and installed to perform specific functions. For e*ample,a fire sprinkler system is e*pected to control or e*tinguish fires: To acplish this,the system sprink
28、lers must open,and the required amount of water to achieve control or e*tinguishment must be delivered to the fire location. A fire detection system is intended to provide sufficient early warning of a fireto permit occupant notification and escape,fire servicenotification,and in some cases activati
29、on of other fire protection features (e.g.,special e*tinguishing systems,smoke management systems). Both system activation (detection) and notification (alarm) must occur to achieve early warning. Construction partmentation is generally designed to limit the e*tent of fire spread as well as to maint
30、ain the buildings structural integrity as well as tenability along escape routes for some specified period of time. In order to acplish this,the construction features must be fire rated” (based on standard tests) and the integrity of the features maintained. The reliability of individual fire protec
31、tion strategies such as detection,automatic suppression,and construction partmentation is important input to detailed engineering analyses associated with performance based design. In the conte*t of safety systems,there are several elements of reliability,including bothoperational andperfornzzsance
32、reliability. Operational reliability provides a measure of the probability that a fire protection system will operate as intended when needed. Performance reliability is a measure of the adequacy of the feature to successfully perform its intendedhnction under specific fire e*posure conditions. The
33、former is a measure of ponent or system operability while the latter is a measure of the adequacy of the system design. The scope of this study was limited to evaluation of operational reliability due primarily to the form of the reported data in the literature. In addition to this distinction betwe
34、en operational and performance reliability,the scope focused on unconditional estimates of reliability and failure estimates in terms offail-dangerous outes. A discussion of these terms is provided later in the paper. ScopeThis paper provides a review of reported operational reliability and performa
35、nce estimates for (1) fire detection,(2) automatic suppression,and to a limited e*tent (3) construction partmentation.In general,the reported estimates for fire detection are largely for smoke detectiodfire alarm systems; automatic sprinklers prise most of the data for automatic suppression,and part
36、mentation includes partment fire resistance and enclosure integrity. It should be noted that in some cases the literature did not delineate beyond the general categories of fire detection” or automatic suppression,” requiring assumptions regarding the specific type of fire protection system. Several
37、 studies reported estimates of reliability for both fire detection and automatic sprinkler system strategies. However,very little information was found detailing reliability estimates for passive fire protection strategies such as partmentation. A limited statistical based analysis was performed to
38、provide generalized information on the ranges of such estimates and related uncertainties. This latter effort was limited to evaluation of reported data on detection and suppression. Insufficient data were identified on partmentation reliability to be included. This paper addresses elements of relia
39、bility as they relate to fire safety systems. The literature search that was performed for this analysis is reviewed and important findings and datasummarized. The data found in the literature that were applicable to sprinkler and smokedetection systems reliability were analyzed,with descriptive est
40、imates of the mean values and 95 percent confidence intervals for the operational reliability of these in situ systems reported. ELEMENTS OF RELIABILITY ANALYSIS There is considerable variation in reliability data and associated analysesreported in the literature. Basically,reliability is an estimat
41、e of the probability that a system or ponent will operate as designed over some time period. During the useful or e*pected life of a ponent,this time period is reset” each time a ponent is tested and found to be in working order. Therefore,the more often systems and ponents are tested and maintained
42、,the more reliable they are. This form of reliability is referred to as unconditional. Unconditional reliability is an estimate of the probability that a system will operate on demand.” A conditional reliability is an estimate that two events of concern,i.e.,a fire and successful operation of a fire
43、 safety system occur at the same time. Reliability estimates that do not consider a fire event probability are unconditional estimates. Two other important concepts applied to operational reliability arefuiled-safe andfailed- dangerous.when a fire safety system fails safe,it operates when no fire ev
44、ent has occurred. A mon e*ample is the false alarming of a smoke detector. A fire safety system fails dangerous when it does not function during a fire event.In this study,thefailed-dangerous event defines the Operational probability of failure (1-reliability estimate). A sprinkler system not operat
45、ing during a fire event or an operating system that does not control or e*tinguish a fire are e*amples of this type of failure. The overall reliability of a system depends on the reliability of individual ponents and their corresponding failure rates,the interdependencies of the individual ponents t
46、hat pose the system,and the maintenance and testing of ponents and systems once installed to veri operability. All of these factors are of concern in estimating operationaz reliability. Fire safety system performance is also of concern when dealing with the overall concept of reliability. System per
47、formance is defined as the ability of a particular system to acplish the task for which it was designed and installed. For e*ample,the performance of a fire rated separation is based on the construction ponents ability to remain intact and provide fire separation during a fire. The degree to which t
48、hese ponents prevent fire spread across their intended boundaries defines system performance. Performance reliability estimates require data on how well systems acplish their design task under actual fire events or full scale tests. Information on performance reliability could not be discerned direc
49、tly from many of the data sources reviewed as part of this effort due to the form of the presented data,and therefore,it is not addressed as a separate effect. The cause of failure for any type of system is typically classified into several general categories: installation errors,design mistakes,man
50、ufacturing/equipment defects,lack of maintenance,e*ceeding design limits,and environmental factors.There are several approaches that can be utilized to minimize the probability of failure.Such methods include (1) design redundancy,(2) active monitoring for faults,(3) providing the simplest system (i
51、.e.,the least number of ponents) to address the hazard,and (4)a well designed inspection,testing,and maintenance program. These reliability engineering concepts are important when evaluating reliability estimates reported in the literature. Depending on the data used in a given analysis,the reliabil
52、ity estimate may relate to one or more of the concepts presented above. The literature review conducted under the scope of this effort addresses these concepts where appropriate.Most of the information that was obtained from the literature in support of this paper were reported in termsof unconditio
53、nal operationaZ reliability,i.e.,in terms of the probability that a fire protection strategy will not faiZ dangerous. LITERATURE REVIEWA literature search was conducted to gather reliability data of all types for fire safety systems relevant to the protection strategies considered: automatic suppres
54、sion,automatic detection,and partmentation.The objective of the literature search was to obtain system-specific reliability estimates for the performance of each type of fire safety system as a function of generic occupancy type (e.g.,residential,mercial,and institutional). Sources of information in
55、cluded national fire incident database reports,US Department of Defense safety records,industry and occupancy specific studies,insurance industry historical records and inspection reports documented in the open literature,and e*perimental dataReports on e*perimental work and fire testing results wer
56、e utilized only when fire detection,automatic suppression,or partmentation strategies were e*plicitly evaluated. Tests of systems used for qualification,approval,or listing were also reviewed for information on failure modes. Published data from the United Kingdom,Japan,Australia,and New Zealand wer
57、e included. General Studies Several broad based studies were identified that reported reliability estimates for fire detection and fire suppression systems as well as construction partmentation. These included (1) the Warrington Fire Research study 1996 in the United Kingdom,(2) the Australian Fire
58、Engineering Guidelines Fire Code Reform Center,19961,(3) a pilation of fire statistics for Tokyo,Japan TokyoFire Department,19971,and(4)results from a study of in situ performance of fire protection systems in Japan Watanabe,19791.The Warrington Fire Research study addressed the reliability of fire
59、safety systems and the interaction of their ponents. A Delphi methodology was used to develop discrete estimates of the reliability of detection and alarm systems,fire suppression systems,automatic smoke control systems,and passive fire protection (e.g.,partmentation). The Australian Fire Engineerin
60、g Guidelines were developed as the engineering code of practice supporting the new performance-based Building Code of Australia. Following the methods in this guide,building fire safety performance is evaluated for smouldering,flaming non-flashover,and flaming flashover fires. The performance (ie,pr
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