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<span id="tmyyfroktkho" class="fl arc_btn"></span> </div> </div> </div> <div id="tmyyfroktkho" class="y_ju"><script type="text/javascript">a("title");</script></div> <div id="tmyyfroktkho" class="con_article con_main" id="contentText"> <p>科普作文：談?wù)劰舱?/p><p> 　　摘要：共振對(duì)我們的生活、工作是有一定影響的。但是，只要我們動(dòng)腦筋想辦法共振是容易克服的。</p><p><strong>　　談?wù)劰舱?/strong></p><p> 　　不知道同學(xué)們是否知道這樣一件事。大約一百多年前，拿破侖率領(lǐng)法國(guó)軍隊(duì)入侵西班牙，有一支部隊(duì)從鐵鏈懸橋上通過的時(shí)候，軍官喊起了口令“一、二、三、四!”隨著這令士兵們跨起了整齊的步伐。當(dāng)這隊(duì)人馬快走到對(duì)岸的時(shí)，意外的事情發(fā)生了。士兵們只聽轟隆一聲巨響，橋的一跌入河中，橋上的軍官和士兵都被拋進(jìn)了河里，很多人淹死了。</p><p> 　　這是怎么回事呢?經(jīng)過研究人們才知道這是共振。換句話說就是發(fā)生了振動(dòng)的重合。</p><p> 　　當(dāng)一隊(duì)人馬邁著整齊的步伐前進(jìn)的時(shí)候，所有的腳都以間隔相等的時(shí)間，同時(shí)使勁地踏到橋面上。這些周期性的作用力會(huì)使橋梁結(jié)構(gòu)受到巨大的振動(dòng)。由于橋有自己的固有振動(dòng)頻率，如果行進(jìn)步伐的周期性作用力的頻率接近或等于橋固有的振動(dòng)頻率，就會(huì)產(chǎn)生共振，這時(shí)振動(dòng)就會(huì)越來越強(qiáng)。當(dāng)它超過設(shè)計(jì)規(guī)定的應(yīng)力時(shí)，橋梁就會(huì)倒塌了。因此就發(fā)生了上面所說的悲劇。</p><p> 　　相反，如果行進(jìn)步伐不同，就可以互相抵消一部分振動(dòng)，這樣就沒有什么危險(xiǎn)了。</p><p> 　　所以，世界各國(guó)都有這一條相同的規(guī)定：軍隊(duì)不能以整齊的步伐過橋。</p><p> 　　象這類事情在生活中也是常見的，比如用扁擔(dān)挑水時(shí)，開頭幾步還好，多幾步就不行了，桶里的水就會(huì)隨著你走路的節(jié)奏，一下一下地從水面中間向外竄，在這時(shí)如果你往桶里放一塊木板，挑起來就平穩(wěn)多了。木板起的作用就是破壞共振的。</p><p> 　　共振對(duì)我們的生活、工作是有一定影響的。但是，只要我們動(dòng)腦筋想辦法共振是容易克服的。</p> </div> <div id="tmyyfroktkho" class="y_ju"><script type="text/javascript">a("conten");</script></div> <div id="tmyyfroktkho" class="pnum"> <ul id="page_slice"> <div id="tmyyfroktkho" class="clear"></div> </ul> </div> </article> <div id="tmyyfroktkho" class="list_hot ar_related bj_mt20 louti"> <h4 class="title2 title2_te">相關(guān)文章</h4> <ul class="bj_mt20"> <li id="tmyyfroktkho" class="lb_3 chao"> <time>05-09</time> <a href="http://m.rzpgrj.com/guanhougan/1684510.html" title="永遠(yuǎn)在路上第二集以上率下觀后感作文" target="_blank">永遠(yuǎn)在路上第二集以上率下觀后感作文</a> </li> <li id="tmyyfroktkho" class="lb_3 chao"> <time>05-09</time> <a href="http://m.rzpgrj.com/guanhougan/1684519.html" 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