{"currentpage":1,"firstResult":0,"maxresult":10,"pagecode":5,"pageindex":{"endPagecode":5,"startPagecode":1},"records":[{"abstractinfo":"为了监测整体成型复合材料结构的损伤,提出了一种基于Lamb波和<span style=\"color:red\">Hilbert</span><span style=\"color:red\">变换</span>的能量损伤指数.首先,通过应用<span style=\"color:red\">Hilbert</span><span style=\"color:red\">变换</span>提取Lamb波信号的波形包络;然后选取具有最大峰值的波包,将此波包在结构出现损伤后的能量变化值与损伤前的能量之比作为损伤指示;该方法不需要选择特定的Lamb波模式,克服了Lamb波在复合材料结构中存在的频散、多模式及模式转换给信号分析带来的困难;最后在复合材料T型加筋的损伤演化试验中,对该能量损伤指数进行了应用验证研究.研究结果表明:该能量损伤指数可以用于复合材料T型加筋的损伤监测,当能量损伤指数(EDI)值达到0.62时,所研究的复合材料T型加筋确定有损伤产生.","authors":[{"authorName":"刘国强","id":"f03373f1-4763-44d2-b53b-ae3c729c1eae","originalAuthorName":"刘国强"},{"authorName":"孙侠生","id":"db95f5ab-a0bb-40ad-b562-b1ea38763e40","originalAuthorName":"孙侠生"},{"authorName":"肖迎春","id":"2885064a-c96e-461b-884f-3e8a90dfd135","originalAuthorName":"肖迎春"},{"authorName":"李明","id":"020eeda6-55c7-4ac5-b0f4-e275733aa3e0","originalAuthorName":"李明"},{"authorName":"白生宝","id":"0a29c95b-518b-4f32-9ae2-a4d53a584f97","originalAuthorName":"白生宝"}],"doi":"","fpage":"818","id":"87205116-5a13-4331-8a4f-48ee64856e07","issue":"3","journal":{"abbrevTitle":"FHCLXB","coverImgSrc":"journal/img/cover/FHCLXB.jpg","id":"26","issnPpub":"1000-3851","publisherId":"FHCLXB","title":"复合材料学报"},"keywords":[{"id":"3c38b88f-3082-4423-a8ff-5a9052ad37b5","keyword":"Lamb波","originalKeyword":"Lamb波"},{"id":"db7c3d68-a0c7-4e69-aa8f-8bdc61587471","keyword":"复合材料","originalKeyword":"复合材料"},{"id":"ff23e26c-6a64-48ae-8c66-ea84fd39e239","keyword":"<span style=\"color:red\">Hilbert</span><span style=\"color:red\">变换</span>","originalKeyword":"Hilbert变换"},{"id":"54e6385e-ffd8-424d-a43f-e60bfac47681","keyword":"损伤指数","originalKeyword":"损伤指数"},{"id":"1631f619-1e69-429c-8117-1951549e60f3","keyword":"结构健康监测","originalKeyword":"结构健康监测"}],"language":"zh","publisherId":"fhclxb201403038","title":"基于Lamb波和<span style=\"color:red\">Hilbert</span><span style=\"color:red\">变换</span>的复合材料T型加筋损伤监测","volume":"31","year":"2014"},{"abstractinfo":"提出了一种结合复三角函数和<span style=\"color:red\">Hilbert</span><span style=\"color:red\">变换</span>的绝缘介质损耗因数测量方法.将归一化工频电压信号和电流信号分别移相90°构成<span style=\"color:red\">Hilbert</span><span style=\"color:red\">变换</span>对,再将两组复信号构造新的复三角信号模型,结合复三角函数和<span style=\"color:red\">Hilbert</span> <span style=\"color:red\">变换</span>特性,导出了tanδ的计算式,并给出了算法实现方法和硬件实现方案.仿真结果表明:该算法可有效解决由于频率波动引起的非同步采样和非整周期截断问题,tanδ实际测量的绝对误差小于0.000 03,具有较高的测量精度和抗干扰能力.","authors":[{"authorName":"廖建庆","id":"f8044c26-3097-4151-ae39-e1877c128c20","originalAuthorName":"廖建庆"},{"authorName":"梁国祥","id":"42d7dc98-358f-459d-be33-797cd625f711","originalAuthorName":"梁国祥"}],"doi":"10.3969/j.issn.1009-9239.2012.03.017","fpage":"69","id":"e4f0fcf4-a93e-4e5e-af73-5b40b8bef036","issue":"3","journal":{"abbrevTitle":"JYCL","coverImgSrc":"journal/img/cover/JYCL.jpg","id":"50","issnPpub":"1009-9239","publisherId":"JYCL","title":"绝缘材料"},"keywords":[{"id":"ad195ba6-d0d5-41f7-a264-36d9b84cd8f7","keyword":"介质损耗因数","originalKeyword":"介质损耗因数"},{"id":"7bf7b6d2-c6bd-4686-bb59-e6fa1ef8f6f5","keyword":"<span style=\"color:red\">Hilbert</span><span style=\"color:red\">变换</span>","originalKeyword":"Hilbert变换"},{"id":"5432f956-72a0-4289-895d-8f2354bbc1b0","keyword":"非同步采样","originalKeyword":"非同步采样"},{"id":"44fdede6-fccf-46c2-a8ca-1d4bca0f1cad","keyword":"移相","originalKeyword":"移相"},{"id":"7949c5ff-125c-42d6-ae0a-6e1346dd2de1","keyword":"复三角函数","originalKeyword":"复三角函数"},{"id":"edb1128b-2339-4dce-be84-1e4b4f6c835b","keyword":"谐波干扰","originalKeyword":"谐波干扰"}],"language":"zh","publisherId":"jycltx201203017","title":"一种结合复三角函数和<span style=\"color:red\">Hilbert</span><span style=\"color:red\">变换</span>的绝缘介质损耗测量方法","volume":"45","year":"2012"},{"abstractinfo":"为降低Lamb波在复合材料结构中传播时存在的频散现象和各方向传播特性的不一致性给损伤监测带来的困难,提出一种利用<span style=\"color:red\">Hilbert</span><span style=\"color:red\">变换</span>改进的空间滤波器对复合材料结构损伤进行成像的方法.分析了基于空间滤波器的信号合成成像原理,在此基础上利用<span style=\"color:red\">Hilbert</span><span style=\"color:red\">变换</span>构造传感器时域响应信号的解析信号参与到信号合成成像过程中.通过对仿真声源的成像实验,验证了该方法的可行性,通过对碳纤维复合材料板结构上激励源和损伤的成像实验,验证了该方法的功能.研究表明该方法能够识别损伤相对于压电传感器阵列的角度位置和损伤散射信号的到达时刻.","authors":[{"authorName":"王瑜","id":"9edf03fa-9ad0-406e-a2aa-2404da011aeb","originalAuthorName":"王瑜"},{"authorName":"袁慎芳","id":"faba08e1-fbd3-46d0-9e53-f662e7586a77","originalAuthorName":"袁慎芳"},{"authorName":"邱雷","id":"574c28e8-813b-43fa-bff4-960943924575","originalAuthorName":"邱雷"}],"doi":"","fpage":"186","id":"3b8ffd20-164c-40da-8531-2bfb5bee027d","issue":"1","journal":{"abbrevTitle":"FHCLXB","coverImgSrc":"journal/img/cover/FHCLXB.jpg","id":"26","issnPpub":"1000-3851","publisherId":"FHCLXB","title":"复合材料学报"},"keywords":[{"id":"f5ec790a-b1bd-4f5f-9b92-188b240efd08","keyword":"结构健康监测","originalKeyword":"结构健康监测"},{"id":"63c08058-7610-4386-b2d4-281ca3b0b527","keyword":"复合材料","originalKeyword":"复合材料"},{"id":"f0937b78-86b5-4f6a-8db2-319f4c7d786f","keyword":"空间滤波器","originalKeyword":"空间滤波器"},{"id":"c45d8206-47ad-42dc-89ae-b459f74a41c5","keyword":"损伤成像","originalKeyword":"损伤成像"},{"id":"6e838045-41bf-4dbd-856d-dfa0d57c3300","keyword":"压电传感器阵列","originalKeyword":"压电传感器阵列"},{"id":"ff6c17a9-3e97-414a-a7f5-95549ea27611","keyword":"主动Lamb波","originalKeyword":"主动Lamb波"},{"id":"608dd409-a5e8-46ed-984a-9296ca0c6fc7","keyword":"<span style=\"color:red\">Hilbert</span><span style=\"color:red\">变换</span>","originalKeyword":"Hilbert变换"},{"id":"42613c29-64b3-4140-b1fd-24b653fe1194","keyword":"信号合成","originalKeyword":"信号合成"}],"language":"zh","publisherId":"fhclxb201101033","title":"基于改进空间滤波器的复合材料结构损伤成像方法","volume":"28","year":"2011"},{"abstractinfo":"提出一种基于Contourlet<span style=\"color:red\">变换</span>的偏振图像融合算法.Contourlet<span style=\"color:red\">变换</span>是一种具有几何信息的灵活多尺度、多方向和平移不变性的图像分解<span style=\"color:red\">变换</span>,与小波<span style=\"color:red\">变换</span>相比,对图像分析很重要的沿曲面任意方向反映的细节更容易调整.采用Contourlet<span style=\"color:red\">变换</span>对三个555 mm波段不同方向的偏振图像进行分解,对于高频和低频系数分别采用不同的窗函数计算区域能量,最后加权实现偏振图像的融合处理.实验结果表明,该算法与小波分解法相比在保留原始图像边缘和纹理信息的同时,可以体现偏振图像特点,取得较好的融合视觉效果.","authors":[{"authorName":"张晶晶","id":"d02b8b06-5df2-4caf-a20c-f4fef608f997","originalAuthorName":"张晶晶"},{"authorName":"方勇华","id":"cdf056ae-a47b-4ae5-87ba-0820d86637e1","originalAuthorName":"方勇华"},{"authorName":"易维宁","id":"5d7fa172-d5b3-460f-bc0f-70dcbfa5d17a","originalAuthorName":"易维宁"}],"doi":"10.3969/j.issn.1007-5461.2009.05.003","fpage":"525","id":"7c7ff2a6-da59-4cc5-a9c3-60a082d3deaa","issue":"5","journal":{"abbrevTitle":"LZDZXB","coverImgSrc":"journal/img/cover/LZDZXB.jpg","id":"53","issnPpub":"1007-5461","publisherId":"LZDZXB","title":"量子电子学报   "},"keywords":[{"id":"16463321-06c5-43da-b9ce-0cb03bbe99b3","keyword":"图像处理","originalKeyword":"图像处理"},{"id":"5401c015-6109-4b16-b401-12f5912babe3","keyword":"Contourlet<span style=\"color:red\">变换</span>","originalKeyword":"Contourlet变换"},{"id":"b99bb50e-ffd4-440b-b34d-05fad444b693","keyword":"融合规则","originalKeyword":"融合规则"},{"id":"031b4bec-6a42-4daf-a918-85bf50d09317","keyword":"偏振图像","originalKeyword":"偏振图像"},{"id":"c18af424-51ab-43d4-a19e-3c67ac6719d0","keyword":"区域能量","originalKeyword":"区域能量"}],"language":"zh","publisherId":"lzdzxb200905003","title":"基于Contourlet<span style=\"color:red\">变换</span>的偏振图像融合","volume":"26","year":"2009"},{"abstractinfo":"采用计算机辅助实验技术，研究X射线衍射线开在仪器宽化修正过程中Fourier系数变化的规律及其影响，结果表明，只要实测线形接近Gauss 分布，Fourier<span style=\"color:red\">变换</span>就会导致弯勾效应；Forier<span style=\"color:red\">变换</span>可引起真实线形的尾部波动及大于实际值的宽化，引入边界条件可予以消除，Kα双线形经过Fourier<span style=\"color:red\">变换</span>后，Fourier纱数与真实Fourier系数存在着一定的差异。通过真实线形的Fourier<span style=\"color:red\">变换</span>可以修正.","authors":[{"authorName":"刘刚","id":"71e7d773-7b84-4590-8013-5c8ef9a33479","originalAuthorName":"刘刚"},{"authorName":"梁志德","id":"c72baf78-cd25-439b-a3f4-7a75bcb7f5bf","originalAuthorName":"梁志德"}],"categoryName":"|","doi":"","fpage":"109","id":"8eaac21e-72f9-420f-a0ba-896fc0b4e623","issue":"1","journal":{"abbrevTitle":"JSXB","coverImgSrc":"journal/img/cover/JSXB.jpg","id":"48","issnPpub":"0412-1961","publisherId":"JSXB","title":"金属学报"},"keywords":[{"id":"577be53d-83af-4b02-a560-613dce82e110","keyword":"X射线衍射线形","originalKeyword":"X射线衍射线形"},{"id":"e4ddf0f4-1a1a-4246-8182-102724c1d0d4","keyword":"null","originalKeyword":"null"}],"language":"zh","publisherId":"0412-1961_2002_1_6","title":"X射线衍射线形Fourier<span style=\"color:red\">变换</span>","volume":"38","year":"2002"},{"abstractinfo":"采用计算机辅助实验技术,研究X射线衍射线形在仪器宽化修正过程中Fourier系数变化的规律及其影响.结果表明,只要实测线形接近Gauss分布,Fourier<span style=\"color:red\">变换</span>就会导致弯勾效应;Fourier<span style=\"color:red\">变换</span>可引起真实线形的尾部波动及大于实际值的宽化,引入边界条件可予以消除;Kα双线线形经过Fourier<span style=\"color:red\">变换</span>后,Fourier系数与真实Fourier系数存在着一定的差异,通过真实线形的Fourier<span style=\"color:red\">变换</span>可以修正.","authors":[{"authorName":"刘刚","id":"2cd2d30f-f1e3-4b7e-bfe8-95021ce3c2fb","originalAuthorName":"刘刚"},{"authorName":"梁志德","id":"9435ad33-8071-4ad1-8dc4-83b58db3cb79","originalAuthorName":"梁志德"},{"authorName":"卢柯","id":"2fc32bb5-194e-4798-a4ee-073575b9923b","originalAuthorName":"卢柯"}],"doi":"10.3321/j.issn:0412-1961.2002.01.021","fpage":"109","id":"43f278b3-2991-4bdc-92f9-d795f7b8658c","issue":"1","journal":{"abbrevTitle":"JSXB","coverImgSrc":"journal/img/cover/JSXB.jpg","id":"48","issnPpub":"0412-1961","publisherId":"JSXB","title":"金属学报"},"keywords":[{"id":"6abe943f-4395-4014-b892-be57e94b9019","keyword":"X射线衍射线形","originalKeyword":"X射线衍射线形"},{"id":"c90843bb-c9e2-4192-9cfb-8e14f1972e6b","keyword":"Fourier<span style=\"color:red\">变换</span>","originalKeyword":"Fourier变换"},{"id":"009bbd3e-e3b7-4733-adbf-084daed7ac52","keyword":"Fourier系数精修","originalKeyword":"Fourier系数精修"}],"language":"zh","publisherId":"jsxb200201021","title":"X射线衍射线形Fourier<span style=\"color:red\">变换</span>","volume":"38","year":"2002"},{"abstractinfo":"由于成像系统和目标的距离和方位的原因,会导致形成的图像发生透视而不再是正视图,这对于图像的特征提取、识别等后续处理非常不利.对于发生了透视畸变的图像,透视<span style=\"color:red\">变换</span>解决了一般仿射<span style=\"color:red\">变换</span>不能改变图像内部点相对位置的缺陷.文章根据透视<span style=\"color:red\">变换</span>的原理提出了基于改进的霍夫<span style=\"color:red\">变换</span>和透视<span style=\"color:red\">变换</span>的透视图像矫正技术,该算法根据摄像机的成像机理进行透视图像矫正,Matlab仿真实验结果表明,该算法可行性高,简单易行,稳定性好,可广泛推广至目标识别等领域.","authors":[{"authorName":"代勤","id":"40b5cb35-e7bc-46fe-ab5a-043afa13b4c9","originalAuthorName":"代勤"},{"authorName":"王延杰","id":"e8da23c7-f57b-44a4-abb0-953ec100f8a2","originalAuthorName":"王延杰"},{"authorName":"韩广良","id":"8133798a-0e88-42e5-8c1e-7641522e95dc","originalAuthorName":"韩广良"}],"doi":"10.3788/YJYXS20122704.0552","fpage":"552","id":"4299282d-658b-465e-b63a-97b8b1d2b72c","issue":"4","journal":{"abbrevTitle":"YJYXS","coverImgSrc":"journal/img/cover/YJYXS.jpg","id":"72","issnPpub":"1007-2780","publisherId":"YJYXS","title":"液晶与显示   "},"keywords":[{"id":"6cffc206-5968-404c-975c-434bd33bef05","keyword":"图像处理","originalKeyword":"图像处理"},{"id":"7c0befdc-58a9-41d8-afa7-d138f95e1fb7","keyword":"图像矫正","originalKeyword":"图像矫正"},{"id":"bdf152a7-d7a2-454b-8b65-a6f63fd60b76","keyword":"霍夫<span style=\"color:red\">变换</span>","originalKeyword":"霍夫变换"},{"id":"73bcf7bb-de74-4344-a013-6289f801bea7","keyword":"透视<span style=\"color:red\">变换</span>","originalKeyword":"透视变换"}],"language":"zh","publisherId":"yjyxs201204022","title":"基于改进Hough<span style=\"color:red\">变换</span>和透视<span style=\"color:red\">变换</span>的透视图像矫正","volume":"27","year":"2012"},{"abstractinfo":"利用改进的直接方法得到了一类Camassa-Holm方程的等价<span style=\"color:red\">变换</span>和对称群定理,建立了方程新解与旧解之间的关系,在已有的一些精确解的基础上利用对称群定理得到了Camassa-Holm方程的许多新的显式精确解.","authors":[{"authorName":"邱燕红","id":"7a66e277-9ea1-40eb-b962-8e324dde55b2","originalAuthorName":"邱燕红"},{"authorName":"田宝单","id":"8eb29c7d-d075-4d33-87a4-8a6e88fe5194","originalAuthorName":"田宝单"}],"doi":"10.3969/j.issn.1007-5461.2009.06.003","fpage":"654","id":"0623eb45-8cd1-427f-91af-a5e589563fbf","issue":"6","journal":{"abbrevTitle":"LZDZXB","coverImgSrc":"journal/img/cover/LZDZXB.jpg","id":"53","issnPpub":"1007-5461","publisherId":"LZDZXB","title":"量子电子学报   "},"keywords":[{"id":"33bbee6c-ee29-4fcb-ab17-59dd5c0d501e","keyword":"非线性方程","originalKeyword":"非线性方程"},{"id":"d584dcfc-34bf-42f1-9c7a-cfc1a6fd03ae","keyword":"等价<span style=\"color:red\">变换</span>","originalKeyword":"等价变换"},{"id":"4c0d9b55-184f-4bfc-83f8-4e4d40eed43a","keyword":"直接方法","originalKeyword":"直接方法"},{"id":"bb0e3e44-a8a1-42c8-aa90-4106adab4695","keyword":"Camassa-Holm方程","originalKeyword":"Camassa-Holm方程"},{"id":"08803976-ce41-4dd3-94f2-4234ea0deb27","keyword":"精确解","originalKeyword":"精确解"}],"language":"zh","publisherId":"lzdzxb200906003","title":"Camassa-Holm方程的等价<span style=\"color:red\">变换</span>","volume":"26","year":"2009"},{"abstractinfo":"本文讨论了分数傅里叶<span style=\"color:red\">变换</span>与菲涅耳衍射的关系，提出球面衍射过程就是一种具有尺度因子的分数傅里叶<span style=\"color:red\">变换</span>，并应用分数傅里叶<span style=\"color:red\">变换</span>进行衍射光学元件的设计．","authors":[{"authorName":"孙添资","id":"8a427808-4d4a-415e-9fe7-13731c4cbb42","originalAuthorName":"孙添资"},{"authorName":"董智丽","id":"a9e9f6f6-2be0-4066-9ba6-b0839f751a19","originalAuthorName":"董智丽"}],"doi":"10.3969/j.issn.1007-5461.2000.04.016","fpage":"369","id":"98c2f944-0397-4b71-9616-9caeedcd4f4d","issue":"4","journal":{"abbrevTitle":"LZDZXB","coverImgSrc":"journal/img/cover/LZDZXB.jpg","id":"53","issnPpub":"1007-5461","publisherId":"LZDZXB","title":"量子电子学报   "},"keywords":[{"id":"8171a6ee-0548-4449-8a99-485f72155b1c","keyword":"分数傅里叶<span style=\"color:red\">变换</span>","originalKeyword":"分数傅里叶变换"},{"id":"e3a191fc-7535-4951-94c7-8ca9818893ea","keyword":"衍射光学元件设计","originalKeyword":"衍射光学元件设计"}],"language":"zh","publisherId":"lzdzxb200004016","title":"利用分数傅里叶<span style=\"color:red\">变换</span>设计衍射光学元件","volume":"17","year":"2000"},{"abstractinfo":"对整数DCT<span style=\"color:red\">变换</span>矩阵填充规则加以改进,得到一类新的整数<span style=\"color:red\">变换</span>基,称为“类整数DCT”<span style=\"color:red\">变换</span>基.从海量“类整数DCT”<span style=\"color:red\">变换</span>基中搜索出若干优选<span style=\"color:red\">变换</span>基,应用于MPEG4编解码实验,经实验测试和数据分析,结果表明优选“类整数DCT”<span style=\"color:red\">变换</span>基归一化正交矩阵与DCT<span style=\"color:red\">变换</span>的去相关性能相近,可替代整数DCT<span style=\"color:red\">变换</span>在图像编码中所起的作用.由于“类整数DCT”<span style=\"color:red\">变换</span>有完全快速算法,便于硬件实现,应用于图像编码,可降低编码器复杂度.","authors":[{"authorName":"吴君钦","id":"2e68372e-19eb-4ad9-8cb0-f6c51144c84c","originalAuthorName":"吴君钦"},{"authorName":"李艳丽","id":"d7f74092-d879-4342-8da1-46f3f794f21e","originalAuthorName":"李艳丽"},{"authorName":"刘昊","id":"752359b2-841d-424f-803a-fe93634cedc3","originalAuthorName":"刘昊"}],"doi":"10.3788/YJYXS20132802.0278","fpage":"278","id":"9ecef2f7-a95f-4532-ae25-39c2e596674f","issue":"2","journal":{"abbrevTitle":"YJYXS","coverImgSrc":"journal/img/cover/YJYXS.jpg","id":"72","issnPpub":"1007-2780","publisherId":"YJYXS","title":"液晶与显示   "},"keywords":[{"id":"84e39f15-130d-4f90-8a63-e3ddc06ef131","keyword":"整数DCT","originalKeyword":"整数DCT"},{"id":"07dd1613-7b6c-4246-9321-c27739c021cc","keyword":"去相关","originalKeyword":"去相关"},{"id":"dc55e4ca-a550-42f2-b767-bc19e81c2edf","keyword":"快速算法","originalKeyword":"快速算法"},{"id":"ceecf2b0-3b6a-4198-8079-208b7959f79a","keyword":"图像编码","originalKeyword":"图像编码"},{"id":"754b6b56-b1e2-4132-aef6-44248a029a95","keyword":"硬件实现","originalKeyword":"硬件实现"}],"language":"zh","publisherId":"yjyxs201302023","title":"“类整数DCT”<span style=\"color:red\">变换</span>基去相关性能分析","volume":"28","year":"2013"}],"totalpage":206,"totalrecord":2054}