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href="/bethel/news">數(shù)控文章</a></li> </ol> </nav> </div> <!--/sub_menu--><!-- 面包屑導(dǎo)航結(jié)束 --> <!-- 頁面標(biāo)題開始 --> <div id="4mkksekl" class="title"> <h3><a>試驗?zāi)B(tài)分析的測試系統(tǒng)<small></small></a></h3> </div> <!-- 頁面標(biāo)題結(jié)束 --> <hr class="featurette-divider"> <!-- 中部開始 --> <div id="4mkksekl" class="container"> <!-- 正文 --> <div id="4mkksekl" class="lead" id="print"> <p> <a name="bookmark22" style="line-height: 14pt; background-color: transparent;"><span id="4mkksekl" class="613pt"><span lang="EN-US" style="font-size: 13pt;">3.1</span></span></a><span id="4mkksekl" class="6" style="line-height: 14pt; background-color: transparent;">試驗?zāi)B(tài)分析的測試系統(tǒng)</span></p> <p class="21" style="margin:0cm;margin-bottom:.0001pt;text-indent:28.0pt; line-height:21.85pt;mso-line-height-rule:exactly;background:transparent"><span id="4mkksekl" class="2">隨著測試儀器、計算機(jī)技術(shù)、軟件技術(shù)的飛速發(fā)展，動態(tài)試驗中，功能強(qiáng)大 的以計算機(jī)為主體的試驗分析系統(tǒng)逐步取代了依賴于專用信號分析儀的傳統(tǒng)的試 驗分析系統(tǒng)，且功能更強(qiáng)大、靈活。為以計算機(jī)為主體結(jié)構(gòu)的模態(tài)特性試驗分析 系統(tǒng)硬件，如圖</span><span id="4mkksekl" class="2"><span style="font-family: SimSun;">3.2</span></span><span id="4mkksekl" class="2">所示，主要有以下三個分系統(tǒng)組成</span></p> <p class="21" style="margin-top:0cm;margin-right:0cm;margin-bottom:0cm; margin-left:56.0pt;margin-bottom:.0001pt;text-indent:0cm;line-height:21.85pt; mso-line-height-rule:exactly;mso-list:l0 level1 lfo1;tab-stops:79.2pt; background:transparent"><!--[if !supportLists]--><span style="font-size: 12pt; font-family: SimSun;">(1)<span style="font-stretch: normal; font-size: 7pt; line-height: normal; font-family: 'Times New Roman';"> </span></span><!--[endif]--><span id="4mkksekl" class="2">激勵分系統(tǒng)</span></p> <p class="21" style="margin-top:0cm;margin-right:0cm;margin-bottom:0cm; margin-left:56.0pt;margin-bottom:.0001pt;text-indent:0cm;line-height:21.85pt; mso-line-height-rule:exactly;mso-list:l0 level1 lfo1;tab-stops:79.2pt; background:transparent"><!--[if !supportLists]--><span style="font-size: 12pt; font-family: SimSun;">(2)<span style="font-stretch: normal; font-size: 7pt; line-height: normal; font-family: 'Times New Roman';"> </span></span><!--[endif]--><span id="4mkksekl" class="2">測量分系統(tǒng)</span></p> <p class="21" style="margin-top:0cm;margin-right:0cm;margin-bottom:0cm; margin-left:56.0pt;margin-bottom:.0001pt;text-indent:0cm;line-height:21.85pt; mso-line-height-rule:exactly;mso-list:l0 level1 lfo1;tab-stops:79.2pt; background:transparent"><!--[if !supportLists]--><span style="font-size: 12pt; font-family: SimSun;">(3)<span style="font-stretch: normal; font-size: 7pt; line-height: normal; font-family: 'Times New Roman';"> </span></span><!--[endif]--><span id="4mkksekl" class="2">數(shù)據(jù)采集、處理分系統(tǒng)</span><!--[if gte vml 1]><o:wrapblock><v:shapetype id="_x0000_t202" coordsize="21600,21600" o:spt="202" path="m,l,21600r21600,l21600,xe"> <v:stroke joinstyle="miter" /> <v:path gradientshapeok="t" o:connecttype="rect" /> 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cellpadding=0 cellspacing=0 width="100%"> <tr> <td><![endif]> <div> <p class=38 style='line-height:10.5pt;mso-line-height-rule:exactly; background:transparent'><o:p> </o:p></p> </div> <![if !mso]></td> </tr> </table> <![endif]></v:textbox> <w:wrap type="topAndBottom" anchorx="margin" /> </v:shape><v:shape id="_x0000_s1029" type="#_x0000_t202" style='position:absolute; left:0;text-align:left;margin-left:174.45pt;margin-top:-31.7pt;width:130.3pt; height:9pt;z-index:-1;mso-wrap-distance-left:77.5pt; mso-wrap-distance-right:39.85pt;mso-position-horizontal-relative:margin' filled="f" stroked="f"> <v:textbox style='mso-fit-shape-to-text:t' inset="0,0,0,0"> <![if !mso]> <table cellpadding=0 cellspacing=0 width="100%"> <tr> <td><![endif]> <div> <p class=390 style='line-height:9.0pt;mso-line-height-rule:exactly; background:transparent'><span lang=EN-US><o:p> </o:p></span></p> </div> <![if !mso]></td> </tr> </table> <![endif]></v:textbox> <w:wrap type="topAndBottom" anchorx="margin" /> </v:shape><![endif]--><!--[if !vml]--> <!--[endif]--><!--[if gte vml 1]></o:wrapblock><![endif]--><br clear="ALL" /> <a name="bookmark23"></a></p> <p class="21" style="margin:0cm;margin-bottom:.0001pt;line-height:21.85pt; mso-line-height-rule:exactly;tab-stops:79.2pt;background:transparent"><st1:chsdate year="1899" month="12" day="30" islunardate="False" isrocdate="False" w:st="on"><span id="4mkksekl" class="612pt"><span lang="EN-US" style="font-size: 12pt;">3.1.1</span></span></st1:chsdate><span id="4mkksekl" class="6"><span style="font-size: 14pt;">激勵子系統(tǒng)</span></span></p> <p class="21" style="margin:0cm;margin-bottom:.0001pt;text-indent:27.0pt; line-height:21.6pt;mso-line-height-rule:exactly;background:transparent"><span id="4mkksekl" class="2">大多數(shù)振動試驗系統(tǒng)都需要一個裝置使試驗對象產(chǎn)生某種振動，這種裝置根 據(jù)是否與結(jié)構(gòu)相連接，可分為連接式與非連接式。連接式激勵中，最典型的裝置 是由一個或幾個放置在地面上(或固定在支架上)的激振器與試驗對象連接起來組 成或是激振器只與結(jié)構(gòu)相連接。在上述這些情況下激振器對結(jié)構(gòu)的動態(tài)特性有一 定程度的影響。另一些情況下采用非連接式激勵:激勵裝置與對象不相連，力 錘激勵就是最熟悉的例子。有時可以給結(jié)構(gòu)預(yù)加一個靜載荷，突然釋放這個預(yù)載 荷會產(chǎn)生一個階躍輸入力。此外，聲激勵和磁激勵也屬于連接激勵。</span></p> <p class="21" style="margin:0cm;margin-bottom:.0001pt;text-indent:27.0pt; line-height:21.6pt;mso-line-height-rule:exactly;background:transparent"><span id="4mkksekl" class="2">固定式激勵系統(tǒng)常用激振器目前應(yīng)用最為廣泛的主要有電動激振器和電動液 壓式激振器。電動激振器是一種最為流行的激振器，輸入信號通過置于磁場中的 線圈，當(dāng)信號電流交變時，線圈因受到交變力的作用而運(yùn)動。通過動圈的連接裝 置驅(qū)動測試結(jié)構(gòu)，從而產(chǎn)生振動。這類裝置的電阻抗是隨動圈運(yùn)動的幅值而變化 的。這種激振器可良好地工作在</span><span id="4mkksekl" class="2"><span style="font-family: SimSun;">30</span></span><span id="4mkksekl" class="211pt5"><span lang="EN-US" style="font-size: 11pt;">Hz</span></span><span id="4mkksekl" class="2"><span style="font-family: SimSun;">-50</span></span><span id="4mkksekl" class="211pt5"><span lang="EN-US" style="font-size: 11pt;">kHz</span></span><span id="4mkksekl" class="2">的范圍內(nèi)。電液激振器利用液壓原 理進(jìn)行功率放大，以產(chǎn)生很大的激勵力。且能既加靜載又加動載荷，整個機(jī)構(gòu)較 為復(fù)雜，價格昂貴，一般在較低頻率范圍激勵及需要較大激勵力的情況下應(yīng)用。</span></p> <p class="21" style="margin:0cm;margin-bottom:.0001pt;text-indent:33.0pt; line-height:21.6pt;mso-line-height-rule:exactly;background:transparent"><span id="4mkksekl" class="2">激振器給試驗對象的附加質(zhì)量對結(jié)構(gòu)的振動特性總會有一定程度的影響。一 般，激振器與結(jié)構(gòu)之間的連接是通過單向力傳感器實現(xiàn)的，為了有效地測量激振 力，要確保在力測量的方向去激勵結(jié)構(gòu)(如用拉壓測力計時不要對結(jié)構(gòu)施加彎矩)。</span></p> <p class="21" style="margin:0cm;margin-bottom:.0001pt;text-indent:28.0pt; line-height:21.85pt;mso-line-height-rule:exactly;background:transparent"><span id="4mkksekl" class="2">因此，激振器和試驗對象之間的連接應(yīng)當(dāng)在測量方向上是剛性的，而在所有 其他方向上是很柔性的。此外、激振器可能對結(jié)構(gòu)附加一定的質(zhì)量、阻尼和剛度。</span></p> <p class="21" style="margin:0cm;margin-bottom:.0001pt;text-indent:28.0pt; line-height:21.85pt;mso-line-height-rule:exactly;background:transparent"><span id="4mkksekl" class="2">非固定式激勵系統(tǒng)最重要的優(yōu)點是不給結(jié)構(gòu)附加任何質(zhì)量，因而不會影響試 驗對象的動特性。最常見的例子就是力錘激勵，另外還有預(yù)載一釋放激勵，聲激 勵和磁激勵等。對試驗對象進(jìn)行激勵的目的是在規(guī)定頻率范圍內(nèi)產(chǎn)生一定量級的 力。例如用力錘輸入一個沖激，就會產(chǎn)生較為光滑地延伸到指定頻率的力。錘子 和力傳感器結(jié)合在一起構(gòu)成一件儀器，即力錘。激振力的能量量級和頻率展寬取 決于操作者用力的大小、力錘的重量、錘頭的硬度以及結(jié)構(gòu)上被敲擊點的可塑性。</span></p> <p class="21" style="margin-top:0cm;margin-right:0cm;margin-bottom:19.9pt; margin-left:0cm;text-indent:28.0pt;line-height:21.85pt;mso-line-height-rule: exactly;background:transparent"><span id="4mkksekl" class="2">輸入力越接近</span><span id="4mkksekl" class="211pt5"><span lang="EN-US" style="font-size: 11pt;">S</span></span><span id="4mkksekl" class="2">脈沖(持續(xù)時間為零，力幅度無限大，沖量為一個單位)，激出 來的基帶頻展就越寬。錘頭硬，錘的質(zhì)量小，試驗對象表面硬，則力錘與試驗對 象之間的接觸時間就短，這樣激勵信號就接近于6脈沖，激出的基帶頻展將達(dá)到 很高的頻率(比如</span><span id="4mkksekl" class="211pt5"><span lang="EN-US" style="font-size: 11pt;">lOKHz</span></span><span id="4mkksekl" class="2">；</span><span id="4mkksekl" class="2"><span style="font-family: SimSun;">)</span></span><span id="4mkksekl" class="2">。</span><span id="4mkksekl" class="2">錘子重，錘頭軟，接觸時間就會加長，這樣可以激出 較低的頻率來。極端情況，用錘激法可以激勵共振頻率很低的重型結(jié)構(gòu)如建筑物、 火車、船舶、地基等等。</span></p> <p class="21" style="margin-top:0cm;margin-right:0cm;margin-bottom:19.9pt; margin-left:0cm;text-indent:28.0pt;line-height:21.85pt;mso-line-height-rule: exactly;background:transparent"> </p> <p class="MsoNormal"><span style="font-size:9.0pt;font-family:宋體;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman"">本文采摘自“</span><span lang="EN-US" style="font-size:9.0pt">VMC1060</span><span style="font-size:9.0pt; font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">型立式加工中心試驗?zāi)B(tài)分析”，因為編輯困難導(dǎo)致有些函數(shù)、表格、圖片、內(nèi)容無法顯示，有需要者可以在網(wǎng)絡(luò)中查找相關(guān)文章！本文由伯特利數(shù)控整理發(fā)表文章均來自網(wǎng)絡(luò)僅供學(xué)習(xí)參考，轉(zhuǎn)載請注明！</span><span lang="EN-US" style="font-size:9.0pt"> <o:p></o:p></span></p></div> <div id="4mkksekl" class="blank30"></div> <!-- tag --> <div id="4mkksekl" class="blank10"></div> 標(biāo)簽： <a 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