一、概述 YD系列輕型交流高壓試驗(yàn)變壓器是根據(jù)機(jī)電部《試驗(yàn)變壓器》標(biāo)準(zhǔn)在原同類(lèi)產(chǎn)品基礎(chǔ)上經(jīng)過(guò)大量改進(jìn)后而生產(chǎn)的,YD(JZ)系列輕型交直流高壓試驗(yàn)變壓器是在YD系列試驗(yàn)變壓器的基礎(chǔ)上按照國(guó)家標(biāo)準(zhǔn)《ZB...
杯突試驗(yàn)按照國(guó)家標(biāo)準(zhǔn),“試驗(yàn)采用端部為球形的沖頭,將夾緊的試樣壓入壓模內(nèi),直至出現(xiàn)穿透裂縫為止,所測(cè)量的杯突深度即為試驗(yàn)結(jié)果?!边@種試驗(yàn)通常是在杯突試驗(yàn)機(jī)上進(jìn)行。試樣在做過(guò)杯突試驗(yàn)后就像只沖壓成的杯子...
(Erichsen試驗(yàn))如圖1所示。試驗(yàn)時(shí),90mm×90mm的試樣或?qū)挾?0mm的條料試樣放在凹模與壓邊圈之間壓死(壓邊力取10kN),測(cè)出試件剛好破裂時(shí)的凸模壓入深度IE。杯突試驗(yàn)是模擬脹形工藝,...
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評(píng)分: 4.7
由于傳統(tǒng)相關(guān)流量計(jì)測(cè)量精度易受外界條件影響,故系統(tǒng)采用參數(shù)估計(jì)實(shí)現(xiàn)渡越時(shí)間的計(jì)算。其主要思想是把測(cè)量值不斷地逼近理論值,從而不斷地修改數(shù)學(xué)模型中的參數(shù);當(dāng)參數(shù)確定后,計(jì)算流量值。系統(tǒng)采用多核處理器OMAP3530,提高系統(tǒng)的實(shí)時(shí)性。試驗(yàn)數(shù)據(jù)表明,采用參數(shù)估算法實(shí)現(xiàn)的互相關(guān)流量計(jì)具有精度高、實(shí)時(shí)性好等優(yōu)點(diǎn),并具有實(shí)際的工程應(yīng)用價(jià)值。
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大?。?span id="p4zginj" class="single-tag-height">471KB
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評(píng)分: 4.5
提出了一種利用不完整模態(tài)多數(shù)估計(jì)結(jié)構(gòu)損傷的方法。不完整模態(tài)體現(xiàn)在模態(tài)數(shù)少于自由度數(shù),測(cè)點(diǎn)數(shù)少于自由度數(shù)。通過(guò)不完整模態(tài)參數(shù)建立了完整的剪切型模型,然后利用結(jié)構(gòu)變化后產(chǎn)生的廣義殘余力來(lái)估計(jì)結(jié)構(gòu)的損傷。該方法的優(yōu)點(diǎn):(1)不僅可以估計(jì)剛度損傷還可以估計(jì)質(zhì)量的變*化;(2)利用的是不完整模態(tài)。最后用該方法對(duì)一個(gè)結(jié)構(gòu)模型的振動(dòng)臺(tái)試驗(yàn)的結(jié)果做了分析。
《國(guó)外數(shù)學(xué)名著系列(續(xù)一)(影印版)40:模型參數(shù)估計(jì)的反問(wèn)題理論與方法》主要內(nèi)容:Prompted by recent developments in inverse theory, Inverse Problem Theory and Methods for Model Parameter Estimation is a completely rewritten version of a 1987 book by the same author. In this version there are many algorithmic details for Monte Carlo methods, least- squares discrete problems, and least-squares problems involving functions. In addition, some notions are clarified, the role of optimization techniques is underplayed, and Monte Carlo methods are taken much more seriously. The first part of the book deals exclusively with discrete inverse problems with afinite number of parameters, while the second part of the book deals with general inverse problems.
The book is directed to all scientists, including applied mathematicians, facing the problem of quantitative interpretation of experimental data in fields such as physics, chemistry, biology, image processing, and information sciences. Considerable effort has been made so that this book can serve either as a reference manual for researchers or as a textbook in a course for undergraduate or graduate students.
Prompted by recent developments in inverse theory, Inverse Problem Theory and Methods for Model Parameter Estimation is a completely rewritten version of a 1987 book by the same author. In this version there are many algorithmic details for Monte Carlo methods, leastsquares discrete problems, and least-squares problems involving functions. In addition, some notions are clarified, the role of optimization techniques is underplayed, and Monte Carlo methods are taken much more seriously. The first part of the book deals exclusively with discrete inverse problems with afinite number of parameters, while the second part of the book deals with general inverse problems.
《試驗(yàn)統(tǒng)計(jì)方法》主要內(nèi)容:田間試驗(yàn)的設(shè)計(jì)與實(shí)施;次數(shù)分布和平均數(shù)、變異數(shù);理論分布和抽樣分布;統(tǒng)計(jì)假設(shè)測(cè)驗(yàn);方差分析;卡平方測(cè)驗(yàn);參數(shù)估計(jì)方法等等。2100433B
牽引試驗(yàn)的目的是測(cè)定拖拉機(jī)各項(xiàng)牽引指標(biāo)和經(jīng)濟(jì)指標(biāo),畫(huà)出牽引特性曲線。對(duì)于新試制的拖拉機(jī)、新引進(jìn)的樣機(jī)以及原有產(chǎn)品的質(zhì)量檢查,都要進(jìn)行牽引試驗(yàn),畫(huà)出牽引特性曲線,用于指導(dǎo)設(shè)計(jì)、生產(chǎn)和使用。
牽引試驗(yàn)的測(cè)試方法有定距離法和定時(shí)間法兩種。采用定距離法作牽引試驗(yàn)是指拖拉機(jī)在調(diào)整好的工況下,使其穩(wěn)定行駛完規(guī)定的距離,測(cè)量并記錄各項(xiàng)參數(shù)的實(shí)測(cè)數(shù)據(jù);然后,調(diào)整到另一工況,重復(fù)上述測(cè)量,如此逐點(diǎn)進(jìn)行,直至完成全部試驗(yàn)。定時(shí)間法則是使拖拉機(jī)在規(guī)定的路面上,不停車(chē),連續(xù)改變工況進(jìn)行試驗(yàn),每改變一次工況,穩(wěn)定后,隨即在規(guī)定時(shí)間內(nèi):測(cè)取并記錄各參數(shù)的平均值。通常走完全程,便完成一個(gè)擋位的測(cè)量。