[工學(xué)]系統(tǒng)建模與動(dòng)力學(xué)分析-液壓系統(tǒng)ppt課件

1、n單葉片式n雙葉片式sinApsinsiniiTApR1/vg000(1()()a ppb, , p0p00/dpKdV V/v /RvDvD24QQvAD4vDQRDn層流對(duì)溫度是敏感的，由于它與粘性有關(guān)。0,0,0,0pvTttttpvT1 11222v dAv dA121 112221112221211;,AAV AV AVv dAVv dAAA1211 1222QAVQAV1122QQ12QQ1 122AVAV12dAds/dv dtpdA(/)pps ds dA coscos1cosdvpmpdApds dAgdAdsdtsdvpdAdsdsdAgdAdsdtsdvpgdts dvv

2、 dsvvvvdts dttst1cosvvpvgsts cos/zs10vvpzvgstss/0vt 10/0dvdpdzvgvdvdpgdzdsdsds22vpgz常數(shù)22vpzgg常數(shù)22vg/pz202vvpgzts202svvpdsgzt常數(shù)12212211221200221122122222ssssvpvpvvdsgzdsgzttvpvpvgzgzdst20eAC A2221122()gvvpp1122v Av A21222112()1 (/)gvppAA02212222012()1 (/)eeC Agv AppC AA022120122220122()()1 (/)veveC C

3、 AggQC v AppcAppC AA222011 (/)veeC CcC AANoImage1-12-2H0, 0, 0, 022111zpHzpv2222112122zpgvzpgvgHvorgvH22/222gHcAQ20vocC C流量系數(shù)vC 速度系數(shù)oC 收縮系數(shù)化速度、電流或流量的變勢能變化阻量2mN532msNorsmmN流量的變化壓力差的變化液阻)(21HHKQl23msorsmm流量的變化水頭差的變化液阻 22121/1)(msKQHHdQHHdRlllK)13(21HHKQtQHHdQHHd2121222121/2RmsQHHdQHHdt2121212121212121

4、121121HHdHHQHHdHHHHQHHdHHKdQt勢能的變化質(zhì)量或位移的變化液容 NmmNm523或壓力的變化流體量的變化液容 23mmm或水頭的變化流體量的變化液容 秒的變化流量（速度、電流）每勢能的變化慣量 52232ImsNsmmN或流量每秒的變化壓力的變化液感2223Imssmm或流量每秒的變化水頭的變化液感 )(2mA)(2mNppApAdtdvMALpAdtdvALpdtdQAL52msNALdtdQpIhdtdQAgLorghdtdQAL22msAgLdtdQhIQAv體積流量FmgpAhA gph g HhQoqiqsm3sm3sm3) 1 ()(dtqqCdhoidQ

5、dHR HKQ QH,oqh,oqdQhdH ,)2(oqhdQdHR)3(iiRqhdtdhRCorRhqdtdhCoqoq)4(iooqqdtdqRC)5(iooeedtdeRCRCoeieq2qdtqqdhC)(1111211Rhhq)1 (121111RhqRhdtdhCdtqqdhC)(2122222RhqqRhdtdhCRCRCRdthdCRCR2221222112222211)(qqdtdqCRCRCRdtqdCRCR221222112222211)(222qRh )2(11221222RhRhRhdtdhC21AA ，kxAA21xpCxppCppgcAqxppCppgcAqss20202221111)(2)(2gckC221qq21ppps21ppp2;221ppppppss),(211pxfxppCxppCqss11,qqppxx) 1 (11ppbxxaqq222! 21)()(xxdxfdxxdxdfxfxfz0, 0, 01qpx)2(21