• <tr id="yyy80"></tr>
  • <sup id="yyy80"></sup>
  • <tfoot id="yyy80"><noscript id="yyy80"></noscript></tfoot>
  • 99热精品在线国产_美女午夜性视频免费_国产精品国产高清国产av_av欧美777_自拍偷自拍亚洲精品老妇_亚洲熟女精品中文字幕_www日本黄色视频网_国产精品野战在线观看 ?

    Study on CAD Data Interface to Geometry Description System

    2011-03-09 11:56:58LIUXiangkai劉祥凱TANGYanfeng唐彥峰WANGJianing王佳寧LIHuimei李慧梅
    Defence Technology 2011年2期

    LIU Xiang-kai(劉祥凱),TANG Yan-feng(唐彥峰),WANG Jia-ning(王佳寧),LI Hui-mei(李慧梅)

    (Department of Automotive Engineering,Academy of Military Transportation,Tianjin 300161,China)

    Introduction

    The geometry description system(GDS)for target is a foundation for both vulnerability/lethally(V/L)assessment and battlefield damage simulation(BDS).Its basic function is to simplify and aid the target description,efficiently manage the name,geometric data,mechanical and physical parameters of each component of the target,calculate the vulnerable areas and estimate the shotline data of a target.

    Usually,the construction and validation of a target's geometry description model is a very crucial and time-consuming task.The main problem is where and how the description data can be obtained.Currently,there are three data sources for modeling[1].

    1)Blueprints,schematics,mechanical drawings or photographs.They can save time or resources and provide precise data with minimal data collection effort,and also suggest ways to structure the model,e.g.,by providing wiring diagrams,subsystem schematics,etc.But,sometimes,they may be difficult to read,and do not always show all needed measurement data or views.

    2)Measurable object.It can arguably provide the best source of verifiable information byproviding hands-on access to the actual objects being modeled.But,it can be resource and labor intensive and limited by the objects'availability,accessibility and measurability.

    3)Transformable geometric models.They can offer significant savings in data collection and/or measurement.But,they may have missing data,unfamiliar naming,and alternate or dissimilar geometry formats,e.g.,feature-based objects,spines,etc.,and can also be unsuitable for a given application because the original model is developed for different purposes.

    With the development of CAD/CAM technology,more and more CAD models are used in design and production areas.To apply them in target description has become an important problem we face.Currently,there are two ways.

    One of them is to convert and integrate the analysis program to a common CAD platform.Another is to bring and integrate the 3-dimension technique to V/L analysis program,such as BRL-CAD,directly.

    In V/L field,each method is suitable,and can solve the modeling and analyzing works efficiently.But in battlefield damage assessment and repair(BDAR)field,some problems can not be solved.First,in a BDS system,there may exist hundreds of multi-kinds of equipment and threats,e.g.,tanks,vehicles,cannons,bombs,mines,etc.,under a complicated combat environment.And they need to be treated in a short time.The above methods are difficult to satisfy the requirements in calculation speed and storage capacity.Second,the CAD data may be too detail or rough and its application can be limited in BDAR field in some extent.Finally,it is very difficult to integrate the CAD system to current BDS systems.Thus,it is very important to set up a more economic and suitable method to satisfy the requirements of BDS systems[2].

    1 Basic Principle

    1.1 CAD Data Analysis

    There are two kinds of CAD systems,two-dimensional and three-dimensional CAD systems.Considering that the three-dimensional CAD data is relatively complex and the two-dimensional model is widely used in practice design,the two-dimensional CAD model will be selected in this paper.

    Generally,various CAD systems use different data formats.We can not study every data format.Fortunately,there are several standard drawing file formats for data exchange,such as AutoCAD's DXF(data exchange format),IGES(initial graphics exchange specification)and STEP(standard for the exchange of product model data).

    AutoCAD's DXF(drawing exchange format)is a data file format to enable data interoperability between AutoCAD and other programs.It is a tagged data representation of all the information contained in an Auto-CAD drawing file[3].The tagged data means that each data element in the file is preceded by an integer that is called a group code.The group code's value indicates the type of followed data element and the meaning of a data element for a given object,or record,type.Virtually,all user-specified information in a drawing file can be represented in DXF format.DXF format has many advantages,for example,it is very precise,easy to edit or understand.Meanwhile,we can import or export them into or from all two dimension CAD systems,and we can extract data from DXF files more easy.Thus,in this paper,the main work will focus on extracting data from DXF.

    1.2 Requirement Analysis

    In BDS system,the target's geometry description relies on following considerations.1)A target is composed of a group of units,i.e.components or parts.2)Each unit consists of one or more regions.A region may be a structure element of a unit,or just a null space.Each region must own a fixed space,and has almost the same mechanical,physical and chemical characteristics.3)Each region is combined by entities through three logic operations,include intersection(+),difference(-)and union(·).4)Each entity must be a basic entity predefined by the system.5)The basic entity must be limited in numbers,simple to be described and calculated.

    In fact,the description of a target in a BDS system is not very strict.For example,not all items but basic items which will affect the safety and task accomplishment when it is damaged should be described.For each basic item,its name,size,position and material parameters shall be accurately described and input into the system.If the target's structure and each basic item's,name,material and parameters are known,our main object is to extract the size,shape and position of each basic item from 2-dimensional CAD data.

    Although there are significant difference between BDR analysis and vulnerability analysis,for example,BDR engineers are interested in the functional damages,i.e.,the areas that need to be repaired before next mission,while vulnerability engineers are interested in identifying the areas that result in loss of the target,i.e.,the areas that need to apply the vulnerability-reduction techniques[4],the basic principle,structure,method and procedure of their target description systems are almost the same.

    Currently,the geometry description systems both in BDR and V/L field use CSG technique[5-9].The basic entities include ARB(arbitrary convex polyhedron),BOX(box),RAW(right angle wedge),RCC(right circular cylinder),REC(right elliptical cylinder),SPH(sphere),RPP(rectangular parallelepiped),etc.

    The description ways for basic entities may be different in different systems.For example,in a system,the coordinates of each vertex are used,while in another system,the faces or edges are adopted.Fig.1 shows the general model of a RPP,and it can be described as

    Fig.1 Model of RPP

    Considering that it is not difficult to convert a data format to another,and the application of the proposed model may not be affected,also,in order to simplify the calculation and reduce the unnecessary modification for the existed damage simulation system,the description model used in Ref.[7]can be selected.

    Figure 2 shows the model of a RPP used in this paper,it can be described as

    Fig.2 Model of RPP in this paperFigure 3 shows the model of a RCC used in this paper,it can be described as

    The basic function of the interface is to extract the data from CAD data to satisfy the requirements of BDSS as described in Ref.[7].

    Fig.3 Model of RCC in this paper

    1.3 Logic Flow of Interface

    DXF file records all geometry information and many kinds of attribute information.These original element data can be read easily.But,it does not record the most of topology information,for example,joints between point and line,line and line,point and surface,line and surface,surface and surface.Thus,they can't be transferred into basic geometry entity information simply.

    The geometry elements in engineering drawing include point,line,circle,arc and connection area.Each element must satisfy the projection rules of alignment in length,justification in height and equality in width.They determine the shape of three-dimensional entity.And the size of the entity can be found out from the size label on drawing.Extracted the shape and size of each basic entity in drawing,through projection and size restrict process,the basic entity shape and the relation between them can be identified by using proper methods and the particular information necessary for description model can be obtained finally.Fig.4 is the logic flowchart of the data interface.

    Fig.4 Logic flowchart of interface

    1.4 Analysis of Projection Relationship Semantic(PRS)

    1.4.1 Explicit Projection Semantic(EPS)

    EPS is mainly used to identify the entities which do not intersect,tangent or truncate with others,and it focuses on the recognition of the projection characteristics of lines,planes and entities.

    1)EPS of line type.The basic line type includes solid,dash,dot dash,sparse dash,etc.

    2)EPS of line.The contours of ARB are all lines,and the projection of a linear may be just a point.

    3)EPS of plane.A plane may be normal to a coordinate axis,therefore,its projection may be a linear.

    4)EPS of basic entity.Table 1 shows the EPS of some basic entities.It can be seen that the EPSs of basic entities are mostly on the basis of dot dash lines.

    Table 1 EPS of general basic entities

    1.4.2 Implicit Projection Semantic(IPS)

    If an entity does not intersect with other entities,it can be identified easily by EPS.But,the intersecting of entities is difficult to avoid,which will increase the complexity of identifying entity. However, the combination of entities will leave obvious mark,which can be captured by using the projection rules of point,line,circle and arc.

    1)General IPS.There are enriched of IPS in points,the general IPS can be obtained by classifying the points,Table 1 is the classification of points.

    2)IPS of entity relationship.Intersection and tangent are the basic relationship between two entities.For example,when a tangential point appears,if there is a floating point or hollow point,the tangent of a plane and a curve suface may be identified,while an extrme point may mean an intersection of entities.

    1.5 Analysis of Dimension Constraint Semantic(DCS)

    DRS can be classified to two categories,the explicit dimension semantic(EDS)and implicit dimension semantic(IDS).

    1.5.1 Explicit Dimension Semantic(EDS)

    Every dimension exists as a figure element in CAD data model.For example,the linear dimension semantic can be expressed as 1)A dimension consists of line,boundary line,text and arrowhead;2)The dimension line and boundary line are generally thin solid line;3)The dimension line is parallel with marked dimension,the dimension boundary line is derived from extension line,axis of drawing,or the extension line and axis is used as the gap directly;4)Generally,the prefix of a dimension text can be used to distinguish it with others.For example,Φ means the diameter,R means the radius,and SR may be a SPH.

    Table 2 Classification of points in IPS

    1.5.2 Implicit Dimension Semantic(IDS)

    IDS reveal the relationship between the dimension and graph,the dimension constraint semantic can be reflected only when a primitive is directly limited by a dimension.If a structure is not directly limited by a dimension,and an indirect restriction through projection does not exist,IDS must exist.It may consist of 1)transition,distributing character;2)symmetry structure;3)dimension function semantic.

    1.6 Projection Relation(PR)

    1.6.1 Mergence and Break of Graph Elements

    In a DXF file,each graph element is not organized in a certain order,thus,the data from a DXF file can not directly applied to recognize the entities.In addition,during the generation of orthographic views,a lot of mergence and break of primitives,such as lines,points and arcs,etc.,will be formed,which will make the entity recognition more difficult.For example,in Fig.5,line AB is broken as AC,CD and DB,and they must all be added to the primitive list.As for arc ACB and ADB,they should be merged as a circle.

    Fig.5 Mergence and break of graph elements

    1.6.2 Extraction of Connected Regions

    The minimum connected region generally corresponds to a mapping area of the surface(curved and plane)of an actual object on a projection plane.Through searching of all connected regions in each view,the projection area's explicit expression of the surface of an object in engineering drawings can be obtained.

    Viewing from the direction of projection,some part's surfaces expressed in a view may be invisible,and their outline will be expressed as dash lines.This kind of invisible two dimension area can be called as hidden surface,while the visible area can be the real surface.Considered that a hidden surface may intersect with a real surface,we must process all minimum connection regions which consist of solid lines,dash lines,and both solid and dashed lines must be processed when we extract them from graph data.

    1.6.3 Projection Relation Chain

    The basic principle to set up the projection relation chains is the coordinate matching for each view.For example:1)point to point,the point in a three dimensional space can be obtained by coordinate matching for points;2)point to line,mainly process a dot dash line which represents an axis and an intersection point of two dash lines,which represents a circular center position;3)line to line,the corresponding relation of lines in three dimensional coordinate,etc.can be processed.

    1.7 Dimension Constraint(DC)

    From the function of dimensions,they can be divided into 3 kinds,shape dimension,position dimension and global dimension.At the aspect of two-dimension,they can be considered as the point,line,and arc to limit the graph.In order to make the dimension constraint fully play in recognition of entities,some primitives relative to the graph should be recorded,such as the extension lines of a linear dimension,the circular element and line element of a diameter,etc.After that,a dimension constraint chain to organize and describe the relationship between the dimension constraint and primitives can be set up.In this chain,we can make the extension lines be index and indicate to the graph element relative to the dimension.Especially,from the dimension type,we can make use of the prefix of a dimension more efficiently to search the primitives.

    1.8 Recognition of Geometry Relation

    Firstly,search the free primitives.All primitives will be searched,and the primitives which are not explicitly restricted by the dimensions in the projection relation chain,dimension tree and dimension constraint chain will be found out.These primitives are called as free primitives,including free point,line,circular,arc and connection region.

    Secondly,the entity relationship can be determined on the basis of free primitives.

    Thirdly,the entity relationship can be judged on the basis of characteristic point.The end point of intersecting line is called as the characteristic point.From the connection region that the characteristic point belongs to,the judge rules can be described as follows:1)If it is a concave point,then two intersecting entities are all real entity;2)If it is a convex point,then two intersecting entities are all hidden entities.

    1.9 Shape Recognition of Composite Entity

    For the simple entity that does not compose with others,it can be easily recognized through totally con-nection region matching.But in fact,the composite entity is more common.The recognition of composite entity is rather complicated because of its incomplete projection.Due to limited space,it is not discussed in detail.

    2 Implementation and Application

    2.1 Basic Algorithm

    According to the basic principle mentioned above,some basic algorithms can be set up.For example,the algorithm for reading DXF file can be described as the follows.

    1)Open the DXF files in text file format.

    2)Find location record as“Entities”,if not find,then end.

    3)Read a record.

    4)Judge the record's content.

    If it is“ENDSEC”,then end.If it is AcDbLine,AcDbCircle,etc.,then read the relative line data.If it is AcDbDemension,then read the dimension data.

    5)Return to 3).

    Data of each line element or dimension will be stored in a special element linked list.

    The algorithm for the line's break can be written as the follows.

    1)Read a line segment(AiBi)from the element link list.Its start and end points are Aiand Bi.

    2)Calculate all intersection points of all other line segments with AiBiand put them to intersection list.Suppose there are n points totally,and express them as

    3)According to the distances of all points to Ai,rank them increasingly.For description convenience,the ranked point list can be expressed as Eq.(1)also,and the broken line segment AiBiis

    4)Return to 1),until all line segments have been broken.

    2.2 Implementation

    After software analysis and design,a special program was developed in Microsoft VC++6.0 and SQL Server 2000.It can extract data from DXF file and translate it to another data format which is used in other software named as vehicle battlefield damage simulation system(VBDS).And it is integrated to VBDS and becomes an important module of it.There are three main lists to store entity data in VBDS.

    1)Unit list for name,number and the description of basic items.

    2)Element list for its number,material,operation expression and the unit it belongs to.

    3)Entity list for its number,type,geometry parameters,etc.

    2.3 Application

    Figure 6 is the front view of a simplified gear box of a vehicle.Fig.7 shows the program interface and running result.

    Fig.6 Front view of gear box shell and first axis

    1)Six entities(No.1 to 6)are extracted from CAD data by the program successfully.

    2)Five elements(No.1 to 5)and two units(first axis and box shell)are set up manually.

    3)The entities 1,2,3 and 6 are RCCs.They are all real entities.

    4)The entities 4 and 5 are RPPs.4 is a real entity,5 is a virtual entity,and their relation is 4 - 5.They form the box shell.

    After data extraction,shot-line analysis can be carried out for the gear box.In the analysis,a point explosive model can be used.The explosive point is(1 000 mm,1 000 mm,0 mm),the elevation is[0°,180°]with the step of 5°,and the azimuth is [0°,360°]with the step 5°also.

    3 Discussions

    Through systematic analysis and research,a new method to apply the CAD data to target description system is presented,and an interface model between CAD data and TDS is developed.The practical application indicates that the data interface model is feasible,and it can complete the basic data extraction and transformation and provide a technical support for a utility interface.

    There are still some problems in this model,for example,the element and unit data can't be extracted from CAD model,it is more proper for simple CAD model,etc.The research should be carried out more deeply.

    Fig.7 Program interface

    [1]Butler Lee A,Edwards Eric W,Kregel Dwayne L.BRLCAD tutorial series:volumeⅢ-principles of effective modeling[M].MD:U.S.Army Research Laboratories,2003:5.

    [2]LIU Xiang-kai,TANG Yan-feng,WANG Jia-ning,et al.A study on an interface between CAD model and geometry description model of materiel[J].Beijing:Acta Armamentarii,2007,28(1):115 -118.(in Chinese)

    [3]AutoCAD 2011,DXF Reference[M/OL].CA:Autodesk Inc,2010,http:∥ images.autodesk.com/adsk/files/acad_dxf2.pdf.

    [4]Kaplan Bruce J,Wallick D Jerry.ABDR analysis methodology development requiremrnts[R].VA:Logistic Management Institute,ADA304294,1994:1-25.

    [5]Bain Lawrence W,Jr Reisinger Mathew J.The gift code user manual[R].VolumeⅠ.Introduction and Input Requirements.MD:U.S.Army Ballistic Research Laboratories,1975:1 -60.

    [6]ZHENG Zhen-zhong.Battle damage conspectus for armored vehicle[M].Beijing:The Publishing House of Ordnance Industry,2004:186-188.(in Chinese)

    [7]LIU Xiang-kai.Study on battle damage simulation model for materiel[D].Shijiazhuang:Academy of Ordnance Engineering,2001:1-88.(in Chinese)

    [8]Muuss Michael J.GED:an interactive solid modeling system for vulnerability assessment[R].MD:U.S.Army Ballistic Research Laboratories,ADA126657,1983:1 -69.

    [9]Butler Lee A,Edwards Eric W,Schueler Betty J,et al.BRL-CAD tutorialseries:volumeⅡ-introduction to MGED[M].MD:U.S.Army Research Laboratories,2001:259-265.

    亚洲中文av在线| 纯流量卡能插随身wifi吗| 一级黄片播放器| 插阴视频在线观看视频| 亚洲精品久久午夜乱码| 国产亚洲欧美精品永久| 26uuu在线亚洲综合色| 哪个播放器可以免费观看大片| 一级,二级,三级黄色视频| 纵有疾风起免费观看全集完整版| 看免费成人av毛片| 亚洲久久久国产精品| 伦精品一区二区三区| 亚洲第一av免费看| 丝袜喷水一区| 老熟女久久久| 高清在线视频一区二区三区| 国产 精品1| av不卡在线播放| 美女内射精品一级片tv| 91精品伊人久久大香线蕉| av在线播放精品| 黄色怎么调成土黄色| 18禁在线播放成人免费| 国国产精品蜜臀av免费| 桃花免费在线播放| 精品国产乱码久久久久久小说| 久久久国产精品麻豆| 久久国产精品男人的天堂亚洲 | 国产国语露脸激情在线看| 欧美日韩在线观看h| av播播在线观看一区| 天天操日日干夜夜撸| 久久久亚洲精品成人影院| 三级国产精品欧美在线观看| 五月开心婷婷网| 久久久久国产网址| 亚洲经典国产精华液单| a级片在线免费高清观看视频| 国产精品不卡视频一区二区| h视频一区二区三区| 精品人妻在线不人妻| 丝袜喷水一区| 精品一区二区三卡| 人妻 亚洲 视频| 国产精品麻豆人妻色哟哟久久| 国产深夜福利视频在线观看| 美女视频免费永久观看网站| 韩国高清视频一区二区三区| 国产无遮挡羞羞视频在线观看| 久久99热6这里只有精品| 麻豆乱淫一区二区| 亚洲五月色婷婷综合| 国产精品一二三区在线看| 男人爽女人下面视频在线观看| 国内精品宾馆在线| 国产在视频线精品| 久久国内精品自在自线图片| 午夜激情av网站| 国产视频内射| 国产爽快片一区二区三区| 午夜福利视频在线观看免费| 青春草视频在线免费观看| 少妇精品久久久久久久| 国产成人精品一,二区| 免费看不卡的av| 成人综合一区亚洲| 91成人精品电影| 亚洲三级黄色毛片| 在线观看一区二区三区激情| 久久久久久久亚洲中文字幕| 精品一品国产午夜福利视频| 精品少妇黑人巨大在线播放| 精品人妻熟女毛片av久久网站| 精品人妻熟女毛片av久久网站| 女人久久www免费人成看片| 亚洲av二区三区四区| 三级国产精品欧美在线观看| 国产精品久久久久久久电影| 亚洲av欧美aⅴ国产| 亚洲欧洲精品一区二区精品久久久 | 三级国产精品片| 999精品在线视频| 18禁动态无遮挡网站| 老熟女久久久| 亚洲精品久久成人aⅴ小说 | videosex国产| 91精品三级在线观看| 亚洲成色77777| 国产熟女欧美一区二区| 成人毛片60女人毛片免费| 最新的欧美精品一区二区| 午夜av观看不卡| 亚洲美女视频黄频| 爱豆传媒免费全集在线观看| 国产成人精品婷婷| 最近中文字幕高清免费大全6| 我要看黄色一级片免费的| 久久精品夜色国产| 久久精品久久久久久久性| 欧美亚洲日本最大视频资源| 免费黄频网站在线观看国产| 久久婷婷青草| 一本一本久久a久久精品综合妖精 国产伦在线观看视频一区 | 成年女人在线观看亚洲视频| 一区二区日韩欧美中文字幕 | 欧美日韩av久久| 亚洲五月色婷婷综合| 午夜精品国产一区二区电影| 在线观看人妻少妇| 久久久欧美国产精品| 国产一区二区三区综合在线观看 | 国产精品.久久久| 精品少妇黑人巨大在线播放| 久久精品国产亚洲网站| 日韩一本色道免费dvd| 亚洲精品国产av成人精品| 欧美xxxx性猛交bbbb| 黄色怎么调成土黄色| 午夜福利影视在线免费观看| 精品人妻熟女av久视频| 最近2019中文字幕mv第一页| 在线观看www视频免费| 亚洲av在线观看美女高潮| 国产免费又黄又爽又色| 久久av网站| 欧美最新免费一区二区三区| 91午夜精品亚洲一区二区三区| 成人国产麻豆网| 国产精品三级大全| av在线播放精品| 美女国产高潮福利片在线看| 成人二区视频| 伊人久久国产一区二区| 精品视频人人做人人爽| 日本黄色日本黄色录像| 在线看a的网站| 美女主播在线视频| 国产精品免费大片| 国模一区二区三区四区视频| 久久久精品区二区三区| 国产深夜福利视频在线观看| 久久久久久久亚洲中文字幕| 欧美激情极品国产一区二区三区 | 国产高清不卡午夜福利| 久久久久久久久久久久大奶| 最黄视频免费看| 日韩三级伦理在线观看| 国产黄片视频在线免费观看| 国产片特级美女逼逼视频| 亚洲精品456在线播放app| 国产精品麻豆人妻色哟哟久久| 尾随美女入室| 永久网站在线| 日产精品乱码卡一卡2卡三| 我的女老师完整版在线观看| 丰满乱子伦码专区| 99九九在线精品视频| 在线观看www视频免费| 午夜免费观看性视频| 久久久久国产网址| 欧美精品人与动牲交sv欧美| 国产伦精品一区二区三区视频9| 国产国拍精品亚洲av在线观看| 国产综合精华液| 在现免费观看毛片| 三上悠亚av全集在线观看| 两个人免费观看高清视频| 国产男女超爽视频在线观看| 欧美日韩成人在线一区二区| 久久久久久伊人网av| 最近中文字幕高清免费大全6| a级毛片黄视频| 国产精品久久久久久精品古装| 日韩欧美一区视频在线观看| 夫妻午夜视频| 成人漫画全彩无遮挡| 国产亚洲精品久久久com| 亚洲人成网站在线播| kizo精华| 狠狠婷婷综合久久久久久88av| 精品国产乱码久久久久久小说| 久久久久久久久大av| 最近中文字幕高清免费大全6| 水蜜桃什么品种好| 男女无遮挡免费网站观看| 久久久久国产精品人妻一区二区| 国产精品蜜桃在线观看| 在线观看免费视频网站a站| 欧美+日韩+精品| 伊人亚洲综合成人网| 最近最新中文字幕免费大全7| 丰满迷人的少妇在线观看| 国产 精品1| 日本91视频免费播放| 日本黄色日本黄色录像| 亚洲一区二区三区欧美精品| 各种免费的搞黄视频| 久久青草综合色| 少妇人妻精品综合一区二区| 亚洲av成人精品一区久久| 亚洲中文av在线| 国产黄色免费在线视频| 国产精品三级大全| 国内精品宾馆在线| 97在线人人人人妻| 色5月婷婷丁香| 日本-黄色视频高清免费观看| 美女主播在线视频| 美女xxoo啪啪120秒动态图| 老司机影院成人| 97在线人人人人妻| 国产成人freesex在线| 男女啪啪激烈高潮av片| 18禁裸乳无遮挡动漫免费视频| 大片免费播放器 马上看| 高清毛片免费看| 国产探花极品一区二区| 亚洲精品自拍成人| 777米奇影视久久| 精品少妇内射三级| 在线观看www视频免费| 国产精品国产av在线观看| 满18在线观看网站| 极品人妻少妇av视频| 国产免费视频播放在线视频| 欧美 日韩 精品 国产| 99国产精品免费福利视频| 一级,二级,三级黄色视频| 国产亚洲欧美精品永久| 99久久精品国产国产毛片| 亚洲精品一区蜜桃| 国产精品一区二区在线观看99| 日本色播在线视频| 成人18禁高潮啪啪吃奶动态图 | 女的被弄到高潮叫床怎么办| 欧美老熟妇乱子伦牲交| 一级,二级,三级黄色视频| 日韩中文字幕视频在线看片| 欧美日韩国产mv在线观看视频| 成年av动漫网址| 日韩,欧美,国产一区二区三区| 天天躁夜夜躁狠狠久久av| 中文精品一卡2卡3卡4更新| 夜夜骑夜夜射夜夜干| 蜜桃久久精品国产亚洲av| 在线播放无遮挡| 最新的欧美精品一区二区| 国产片内射在线| 亚洲人与动物交配视频| 欧美一级a爱片免费观看看| 免费观看av网站的网址| 一本色道久久久久久精品综合| av国产久精品久网站免费入址| 免费黄网站久久成人精品| 不卡视频在线观看欧美| 欧美日韩在线观看h| 亚洲av电影在线观看一区二区三区| 国产成人aa在线观看| 新久久久久国产一级毛片| 高清午夜精品一区二区三区| 亚洲怡红院男人天堂| 啦啦啦视频在线资源免费观看| 亚洲精品国产av蜜桃| 人妻制服诱惑在线中文字幕| 亚洲精品自拍成人| 亚洲欧洲精品一区二区精品久久久 | 91久久精品电影网| 黑人高潮一二区| 国产在视频线精品| 亚洲国产毛片av蜜桃av| 熟女电影av网| 18禁裸乳无遮挡动漫免费视频| 性色avwww在线观看| 又黄又爽又刺激的免费视频.| 插逼视频在线观看| 亚州av有码| 国产高清国产精品国产三级| 午夜91福利影院| 久久久久久久亚洲中文字幕| 老司机影院毛片| 一级毛片 在线播放| 最近手机中文字幕大全| 乱码一卡2卡4卡精品| 最近中文字幕2019免费版| 国产一区二区在线观看av| videossex国产| 日本欧美视频一区| 人妻夜夜爽99麻豆av| 大码成人一级视频| 最近手机中文字幕大全| 亚洲三级黄色毛片| 欧美精品一区二区大全| 一级毛片电影观看| 日本黄色片子视频| 十八禁网站网址无遮挡| 亚洲av成人精品一二三区| 久久精品熟女亚洲av麻豆精品| av网站免费在线观看视频| 国国产精品蜜臀av免费| 久久精品国产亚洲网站| 亚洲在久久综合| 日韩伦理黄色片| 好男人视频免费观看在线| 一个人免费看片子| 国产免费一级a男人的天堂| 777米奇影视久久| 少妇 在线观看| 国产成人freesex在线| 七月丁香在线播放| 国产综合精华液| 晚上一个人看的免费电影| 最近中文字幕2019免费版| 五月玫瑰六月丁香| 国产精品熟女久久久久浪| 久久久欧美国产精品| 婷婷色麻豆天堂久久| 一级二级三级毛片免费看| 亚洲精品国产av蜜桃| 免费高清在线观看日韩| 最近最新中文字幕免费大全7| 亚洲av免费高清在线观看| 午夜视频国产福利| 午夜av观看不卡| xxxhd国产人妻xxx| 亚洲国产成人一精品久久久| 狠狠婷婷综合久久久久久88av| a级毛片免费高清观看在线播放| 热re99久久精品国产66热6| 欧美日本中文国产一区发布| 菩萨蛮人人尽说江南好唐韦庄| 毛片一级片免费看久久久久| 成年女人在线观看亚洲视频| 亚洲精品自拍成人| 日韩成人av中文字幕在线观看| 又黄又爽又刺激的免费视频.| 蜜臀久久99精品久久宅男| 搡老乐熟女国产| 久久久久久久大尺度免费视频| 在线天堂最新版资源| 在线观看三级黄色| 少妇熟女欧美另类| 久久精品国产亚洲av涩爱| 美女国产视频在线观看| 美女cb高潮喷水在线观看| 国产毛片在线视频| 欧美日韩精品成人综合77777| 国产黄片视频在线免费观看| 国产日韩欧美亚洲二区| 亚洲第一区二区三区不卡| 一边亲一边摸免费视频| 一边摸一边做爽爽视频免费| 波野结衣二区三区在线| 色婷婷av一区二区三区视频| 国产片特级美女逼逼视频| 免费看不卡的av| 免费高清在线观看视频在线观看| 亚洲成人手机| 午夜福利视频在线观看免费| 蜜臀久久99精品久久宅男| 丝袜美足系列| 精品人妻在线不人妻| 69精品国产乱码久久久| 老司机亚洲免费影院| 欧美激情国产日韩精品一区| 一级毛片 在线播放| 麻豆乱淫一区二区| 人体艺术视频欧美日本| 久久ye,这里只有精品| 99热这里只有精品一区| av.在线天堂| 青春草亚洲视频在线观看| 国产视频内射| 国产淫语在线视频| 亚洲美女黄色视频免费看| 王馨瑶露胸无遮挡在线观看| 成年女人在线观看亚洲视频| 一级毛片黄色毛片免费观看视频| 亚洲国产av新网站| 美女内射精品一级片tv| 建设人人有责人人尽责人人享有的| 日本黄色日本黄色录像| 97超视频在线观看视频| 麻豆精品久久久久久蜜桃| 五月开心婷婷网| 久久久久视频综合| 99久国产av精品国产电影| 成人午夜精彩视频在线观看| 国产一区二区在线观看日韩| 99久久综合免费| 久久毛片免费看一区二区三区| 日韩不卡一区二区三区视频在线| 国产精品久久久久久精品电影小说| 欧美激情 高清一区二区三区| 亚洲国产av新网站| 在线免费观看不下载黄p国产| 岛国毛片在线播放| 啦啦啦在线观看免费高清www| 免费黄色在线免费观看| 热99久久久久精品小说推荐| 精品久久久久久电影网| 少妇人妻精品综合一区二区| 久久久久久久久久人人人人人人| 2018国产大陆天天弄谢| 女的被弄到高潮叫床怎么办| 成年美女黄网站色视频大全免费 | 蜜桃国产av成人99| 狠狠婷婷综合久久久久久88av| 成人漫画全彩无遮挡| av黄色大香蕉| 久久99精品国语久久久| 午夜福利影视在线免费观看| 日日摸夜夜添夜夜添av毛片| 3wmmmm亚洲av在线观看| 婷婷色综合www| 在线精品无人区一区二区三| 一本色道久久久久久精品综合| 蜜桃国产av成人99| 日本免费在线观看一区| 成人漫画全彩无遮挡| av在线老鸭窝| 26uuu在线亚洲综合色| 狂野欧美激情性bbbbbb| 久久久久久久久久久免费av| 国产视频首页在线观看| av线在线观看网站| 久久久久久久久久久久大奶| 国产成人a∨麻豆精品| 久久国产精品男人的天堂亚洲 | 婷婷色综合大香蕉| 免费日韩欧美在线观看| 国产精品99久久久久久久久| 精品午夜福利在线看| 中文字幕免费在线视频6| 男的添女的下面高潮视频| 亚洲婷婷狠狠爱综合网| 在线播放无遮挡| 爱豆传媒免费全集在线观看| 欧美 日韩 精品 国产| 永久免费av网站大全| 日日爽夜夜爽网站| 少妇被粗大的猛进出69影院 | 婷婷色综合www| 亚洲国产日韩一区二区| 精品久久国产蜜桃| 免费黄网站久久成人精品| 成人手机av| 亚洲国产精品成人久久小说| 久久久久久久久久久免费av| 中国国产av一级| 成人综合一区亚洲| 少妇人妻 视频| 一边摸一边做爽爽视频免费| 伦精品一区二区三区| 亚洲欧美精品自产自拍| 国产免费视频播放在线视频| 国产不卡av网站在线观看| 国产一区亚洲一区在线观看| 免费黄网站久久成人精品| 欧美精品一区二区免费开放| 国产精品99久久99久久久不卡 | 国产永久视频网站| 日韩欧美精品免费久久| 高清视频免费观看一区二区| 国产亚洲午夜精品一区二区久久| 国产亚洲av片在线观看秒播厂| 国产一区二区在线观看日韩| 国产乱来视频区| 满18在线观看网站| 久久午夜福利片| 国产探花极品一区二区| 激情五月婷婷亚洲| 国产高清三级在线| 精品国产一区二区久久| 国产精品一二三区在线看| 日韩av不卡免费在线播放| 午夜福利影视在线免费观看| 亚洲中文av在线| 成人18禁高潮啪啪吃奶动态图 | 纵有疾风起免费观看全集完整版| 欧美日韩国产mv在线观看视频| 成年人免费黄色播放视频| 亚洲av电影在线观看一区二区三区| 日韩视频在线欧美| 亚洲国产精品专区欧美| 欧美成人精品欧美一级黄| 亚洲精品,欧美精品| 亚洲欧美日韩另类电影网站| 成年美女黄网站色视频大全免费 | 不卡视频在线观看欧美| 亚洲精品国产色婷婷电影| 久久婷婷青草| 国产精品人妻久久久影院| 日日啪夜夜爽| 亚洲美女视频黄频| 中文字幕免费在线视频6| 久久99精品国语久久久| 97精品久久久久久久久久精品| 国产免费一级a男人的天堂| 亚洲综合精品二区| 夫妻性生交免费视频一级片| av在线播放精品| 成年人免费黄色播放视频| 亚洲国产精品一区三区| 秋霞伦理黄片| 国产国拍精品亚洲av在线观看| 国产一区有黄有色的免费视频| 精品一区二区免费观看| 亚洲精品中文字幕在线视频| 国产精品 国内视频| 国语对白做爰xxxⅹ性视频网站| 秋霞伦理黄片| 亚洲精品乱久久久久久| av在线app专区| 草草在线视频免费看| 老熟女久久久| 国产精品秋霞免费鲁丝片| 欧美成人午夜免费资源| 国产一区二区三区av在线| 熟女人妻精品中文字幕| 女人久久www免费人成看片| 久久影院123| 另类亚洲欧美激情| 国国产精品蜜臀av免费| 美女中出高潮动态图| 午夜激情久久久久久久| 日本欧美视频一区| 一本色道久久久久久精品综合| 丁香六月天网| 日本wwww免费看| 乱人伦中国视频| 人人妻人人澡人人看| 亚洲国产成人一精品久久久| 日本午夜av视频| 亚洲av综合色区一区| 国产午夜精品久久久久久一区二区三区| 亚洲欧美一区二区三区国产| 亚洲欧美精品自产自拍| 国语对白做爰xxxⅹ性视频网站| 你懂的网址亚洲精品在线观看| 毛片一级片免费看久久久久| 性高湖久久久久久久久免费观看| 国产成人av激情在线播放 | 美女脱内裤让男人舔精品视频| 好男人视频免费观看在线| 免费高清在线观看日韩| 国产免费一区二区三区四区乱码| 少妇高潮的动态图| 观看美女的网站| 日本黄色日本黄色录像| 久久97久久精品| 国产精品一区二区三区四区免费观看| 国产av国产精品国产| 欧美激情国产日韩精品一区| 天美传媒精品一区二区| 久久久久国产网址| 国产av国产精品国产| videosex国产| 99久久综合免费| 精品国产露脸久久av麻豆| 久久国内精品自在自线图片| 中文字幕人妻丝袜制服| 成年人午夜在线观看视频| 色网站视频免费| 夜夜骑夜夜射夜夜干| 成年美女黄网站色视频大全免费 | 欧美日韩综合久久久久久| 国产精品久久久久成人av| 两个人的视频大全免费| 欧美精品亚洲一区二区| 边亲边吃奶的免费视频| 亚洲精品第二区| 久久99蜜桃精品久久| 欧美成人精品欧美一级黄| 精品国产乱码久久久久久小说| 特大巨黑吊av在线直播| 又大又黄又爽视频免费| 亚洲国产成人一精品久久久| 一区二区av电影网| 国产亚洲av片在线观看秒播厂| 亚洲综合色网址| 80岁老熟妇乱子伦牲交| 国产日韩一区二区三区精品不卡 | 国产 一区精品| 久久精品久久久久久久性| 91国产中文字幕| 18禁观看日本| 亚洲怡红院男人天堂| 亚洲欧美色中文字幕在线| 午夜久久久在线观看| 日日摸夜夜添夜夜添av毛片| 精品少妇久久久久久888优播| 国产在线视频一区二区| 国产成人a∨麻豆精品| 99精国产麻豆久久婷婷| 曰老女人黄片| 只有这里有精品99| 女的被弄到高潮叫床怎么办| 美女国产视频在线观看| 青春草视频在线免费观看| 免费av中文字幕在线| 免费看不卡的av| 欧美日韩视频高清一区二区三区二| 国产成人一区二区在线| 欧美人与善性xxx| av在线播放精品| 亚洲成人av在线免费| 国产片特级美女逼逼视频| 2022亚洲国产成人精品| 特大巨黑吊av在线直播| 七月丁香在线播放| 男人添女人高潮全过程视频| 中文字幕最新亚洲高清| 欧美激情极品国产一区二区三区 | 青春草亚洲视频在线观看|