简介:Long-periodpulsesinnear-fieldearthquakesleadtolargedisplacementsinthebaseofisolatedstructures.Todissipateenergyinisolatedstructuresusingsemi-activecontrol,piezoelectricfrictiondampers(PFD)canbeemployed.TheperformanceofaPFDishighlydependentonthestrategyappliedtoadjustitscontactforce.Inthispaper,theseismiccontrolofabenchmarkisolatedbuildingequippedwithPFDusingPD/PIDcontrollersisdeveloped.Usinggeneticalgorithms,thesecontrollersareoptimizedtocreateabalancebetweentheperformanceandrobustnessoftheclosed-loopstructuralsystem.Oneadvantageofthistechniqueisthatthecontrollerforcescaneasilybeestimated.Inaddition,thestructureisequippedwithonlyasinglesensoratthebasefloortomeasurethebasedisplacement.Consideringsevenpairsofearthquakesandnineperformanceindices,theperformanceoftheclosed-loopsystemisevaluated.Then,theresultsarecomparedwiththosegivenbytwowell-knownmethods:themaximumpossiveoperationofpiezoelectricfrictiondampersandLQGcontrollers.Thesimulationresultsshowthattheproposedcontrollersperformbetterthantheothersintermsofsimultaneousreductionofflooraccelerationandmaximumdisplacementoftheisolator.Moreover,theyareabletoreducethedisplacementoftheisolatorsystemsfordifferentearthquakeswithoutlosingtheadvantagesofisolation.
简介:摘要:目的:探究中医疗法在治疗妇科输卵管性不孕方面的中药使用规则。研究方式:对中国知网上近 20年来,发布关于中医疗法在治疗妇科输卵管性不孕方面的中药使用规则相关的 100余篇论文进行整理并研究。研究结果:研究的 100余篇文献中,多涉及到穿山甲、黑三棱、皂角刺、莪术以及路路通等地道中草药,其中的大部分地道中草药都具备疏通经络、滋补气血以及活血化瘀等药效。研究结论:中医疗法在治疗该病时,多依据病患实际情况进行用药的规划。