• <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 ?

    Modeling and Simulation for Complex Repairable System with Built-in Test Equipment

    2011-03-09 11:56:58LVXuezhi呂學(xué)志YUYongli于永利ZHANGLiu張柳RENFan任帆
    Defence Technology 2011年2期
    關(guān)鍵詞:永利

    LV Xue-zhi(呂學(xué)志),YU Yong-li(于永利),ZHANG Liu(張柳),REN Fan(任帆)

    (1.Department of Equipment Command,Ordnance Engineering College,Shijiazhuang 050003,Hebei,China;2.Artillery Command Academy,Xuanhua 075100,Hebei,China)

    Introduction

    As the built-in test(BIT)is applied widely,to research its effect on systems and select BIT and test strategy becomes very important.Currently,many researchers are engaged in modeling and simulation for the complex repairable system,to evaluate the availability,mean time to failure(MTTF)and mean time to repair(MTTR)of system from the reliability and maintainability of subsystem[1-7].A lot of literatures show that,in many researches,the BIT diagnostic process is ignored,or it is added into the maintenance process,and the diagnostic time is counted into the maintenance time.Though,it can simplify the model,however,it loses the accuracy of simulation,and the effects of BIT type and test strategy on the system can not be known.Therefore,this paper puts forward a modeling and simulation approach for complex system,and discusses its diagnostic process of complex system with built-in test equipment(BITE).

    In order to make the diagnosis easy and rapid,an important approach is to set special hardware and software in the system,or to test,isolate the fault and monitor the system status with some function components.Thus,the system itself can determine whether it is in normal conditions,or which components are in failure.This is BIT.Therefore,BIT can be defined as an automatic function to test and isolate fault components in system or device.The identifiable part to accomplish BIT is named as BITE.

    There are many kinds of BIT.According to the start and execution modes,BIT can be divided into 3 types:1)Continuous BIT,monitoring the system status continuously and automatically,when some component is in failure,it outputs signal or indication;2)Period BIT,testing and isolating fault components in certain frequency,works automatically without special start;3)Start BIT,testing and isolating the fault only after exterior event happens,such as operator turn it on.Whenever the equipment powers on,the routine test procedure runs,this type of BIT is called as power-on BIT,it is a special sample of start BIT.

    1 Modeling Methods of BITE in Complex Repairable System

    1.1 Considerations in BITE Modeling

    The objective of modeling and simulation of complex repairable system is to evaluate its availability,MTBF and MTTR.The influence of diagnosis process is that there may be some errors and uncertainty,and the right diagnosis can reduce unnecessary maintenance time.

    Assume that the complex repairable system consists of m subsystems.Let Cjdenote the fault event of subsystem j,and Djdenote that the diagnosis result shows the subsystem j is in failure,j=1,2,3…,m.Each diagnosis is independent.There may be two kinds of errors,F(xiàn)+and F-.The probability of error F+is

    Moreover,Xjdenotes the time for test of subsystem j,Yjdenotes the maintenance time of subsystem j when it is in failure really,Zjdenotes the maintenance time of subsystem j when it is not in failure.

    1.2 Modeling Methods

    The modeling and simulation tool used in this paper is SimEvents and Stateflow,and they are two modules of Simulink in Matlab.The core of BIT modeling is to simulate the process that BITE obtains the diagnosis result according to the subsystem status and triggers the corresponding maintenance.Because the continuous BIT is a special sample of period BIT with very short test period,we only introduce the modeling methods of start BIT and periodic BIT in this paper.

    1)Start BIT.Its operation mechanism is that the test begins when the system faults;after the maintenance tasks corresponding to diagnosis results finish,if system has still not recovered yet,the new test and repair begin again till the system runs normally,the repaired subsystems need not to be tested and repaired.Fig.1 gives a sample model of start BIT based on Stateflow.The model has two states,“on”and“off”representing“normal”state and“failure”state respectively.The condition to start BIT is that the system faults,and it can be described as a transition“en(sys.off)”from“on”to“off”;the condition to end BIT is that the system runs normally again,and it can be described as a transition“en(sys.on)”from“off”to“on”.Function“Diagnose()”is used to simulate the uncertainty of BIT diagnosis result for the subsystem status according to error probability,as shown later in Fig.16.The array DRjand a represent diagnosis results together,DRjdenotes the maintenance action for subsystem j.DRjcan be set as 1,2 or 3,3 indicates no maintenance,2 indicates unnecessary maintenance,and 1 indicates necessary maintenance.a represents the number of subsystem necessary to be repaired.Function“IstoRep”is used to determine the maintenance action according to the value of a,as shown later in Fig.17.y represents the diagnosis time.Array djdenotes the state of subsystem j,in maintenance or in waiting,and it can be used in function“Diagnose()”to determine whether subsystem j needs to be tested.Variable s is used to count the number of repaired subsystem.If s equals to a and system have not entered into“on”state,a new cycle of test and repair begins.

    Fig.1 Start of BIT

    2)Period BIT.In a relatively simple case that the system does not stop when the diagnosis results show some subsystems fault and repairing action takes place,as shown in Fig.2,the variables and functions are the same as start BIT.This period BIT detects the subsystems neither in waiting nor in maintenance state every certain time,and determine maintenance action according to the diagnosis results.

    Another period BIT is that the system stop running when the diagnosis results show some subsystems fault and repairing action takes place.This period BIT detects the system every certain time,when diagnosis results show that some subsystems are in failure,the system does not operate in the subsystems’repairing until the necessary maintenance is finished.

    Fig.2 Periodic BIT 1

    Fig.3 Periodic BIT 2

    1.3 Parameter Statistic Model

    The parameter statistic models are where A is the availability,MTBF the mean time between faults,MTTR the mean time to repair,MLDT the mean logistics delay time,ttthe total simulation time,tgthe uptime of system,trthe total maintenance time,m the total number of repair times,n the total number of system failure.

    2 Simulation Example

    A complex repairable system consists of 5 subsystems.Fig.1 gives its fault tree.Tab.1 provides the failure and repair time distribution and subsystem parameters.Tab.2 shows the diagnosis error probability.The queue strategy of maintenance is“first failure first repair”,and there is a server in the maintenance system.The maintenance policy is correct maintenance(CM),and the repaired subsystem can be as good as new one.When the system faults,its subsystems stop.

    Fig.4 Fault tree of system

    Tab.1 Parameters of all subsystems

    Tab.2 Diagnostic error probability

    2.1 Block Diagram of System Simulation

    The simulation model introduced in this paper only considers the situation that the system stops when some subsystems are in failure and repaired.Another situation is different from it slightly only and the simulation model can be modified easily.In Fig.5,the simulation block diagram can be divided into 3 parts,SimEvents at top,Stateflow and SimEvents at bottom.They are connected by 7 events,such as “fault”,“timer”,and“good1”to“good5”.

    Fig.5 Block diagram of system simulation

    2.2 SimEvents

    Fig.6 shows the Timer Generator.It generates entity every equal time interval,and transform into events to simulate the clock advance making the Stateflow operating.

    Fig.6 Timer Generator

    Fig.7 Repair_Server

    Repair_Server in Fig.7 describes that the subsystem experiences two actions,i.e.,queue waiting and repairing.Firstly,Stateflow sends a signal representing the subsystem failure,and it passes through Entity Generator subsystem and is transformed to entity representing failure,as shown in Fig.8.Stateflow also sends a signal representing BITE diagnosis results,and it passes through Signal Generator subsystem and is transformed to a signal describing the entity flow direction,as shown in Fig.9.Then,these entities enter into Set Servicetime subsystem,go out from different exits,and get different maintenance times according to BIT diagnosis results.If DRjequals to 3,it flows into Entity Sink to cancel;if DRjequals to 2,it represents that the maintenance is unnecessary;if DRjequals to 1,it represents that the maintenance is necessary.

    Next,after each entity passes through“Path Combiner”,then enter“FIFO Queue”and queues according to the rule of“first come first serve”.Then,the entity enters“N-Server”to be repaired.Also,the entity enters“Output Switch”to be classified,and flows into different ports.Finally,the entity enters into“En-tity Sink”and sends“good”event representing the finish of maintenance task to Stateflow.

    Fig.8 Entity Generator

    Fig.9 Signal Generator

    Fig.10 Set Servicetime

    Fig.11 End Entity

    2.3 Stateflow

    Firstly,add Stateflow model into simulation model of Simulink and rename it as“system”;secondly,add parallel state:E1,E2,E3,E4,E5,BIT and sys,as shown in Fig.12.Thirdly,add data,event and function into“system”.From Fig.5,we can see the inputs of“system”are six events,such as“timer”and“good1”;the output is“fault”.The output data are availability Ao(),MTBF,MTTR_MLDT and DR;the local data are total repair times m,total system fault times n,simulation time Tt,total system uptime Tg,total repair time Tr.

    Fig.12 Stateflow

    E1,E2,E3,E4 and E5 represent corresponding subsystem respectively,their block diagram structures are the same,and data and events are different slightly only,therefore,we only provide the block diagram of“E1”,as shown in Fig.13.

    Fig.13 E1 chart

    The main function of“sys”is to respond some events,such as“FAULT”,“GOOD”,“BitFault”,and change state,as shown in Fig.14.As long as“sys”is active,it calculates the parameters Ao,MTBF,MTTR_MLDT,according to equations(3)to(5).When event“FAULT”or“GOOD”happens,“sys”will calculate the value of“condition”by using true table,then,determine the system state according to value of“condition”and event.When“sys”enters into“on”state,the simulation clock will be recorded;when“sys”exits“on”state,the total uptime of system will be accumulated.

    The true table to judge the system state is“L=Isok(A,B,C,D,E)”.According to the minimal cut set of fault tree,it can be constructed.Analyzed the fault tree,its minimal cut set is{X1,X5},{X1,X3},{X2,X4,X5}and{X3,X4}.From the definition of minimal cut set[11],we know that,as long as all of events in one of minimal cut sets happen simultaneously,the system fault,thus,they can be transformed to the true table function,as shown in Tab.3,where A,B,C,D and E are the inputs of true table,they denote the state of E1,E2,E3,E4 and E5,and their value 0 or 1 represents the subsystem uptime or downtime,respectively.L is an output of true table,it denotes the state of system,and its value 0 or 1 represents the system uptime or downtime.Decisions D1 to D4 correspond to four minimal cut sets,D5 is a default decision,and it is similar to the default branch in switch-case in C programming language.“-”can take the value of 0 or 1.For example,D1 corresponds to minimal cut set{X1,X5},it means that the system faults when E1 or E5 faults,the values of A,B,C,D and E correspond to D1 are 0,-,-,-,0 in D1;the action corresponding to D1 is 1,and the output L corresponding to D1 is 0.

    Fig.14 Sys block diagram

    Fig.15 BIT block diagram

    Fig.16 Diagnose function

    Fig.17 IstoRep function

    Tab.3 Isok true table function

    2.4 Simulation Results

    The effects of type of BIT,maintenance time and error probability on the system availability are simulated.Tab.4 shows the system availability of different types of BIT in the situation that the system stops when its subsystem faults.It can be seen that the system availability corresponding to start BIT is the highest,while the lowest for the continuous BIT,and the system availability of period BIT decreases with the decrease of the period.The reason is that,in the situation that the system stops when the subsystem faults,for a certain time,with the period decrease,the number of test increase,the ratio of maintenance time to total working time increase also,thus the system availability becomes lower.Tab.5 provides the system availability of different types of BIT in the situation that the system does not stop when the subsystem faults.It can be seen that the system availability corresponding to start BIT is the lowest,while the system availability of continuous BIT is highest,and the system availability of period BIT increases with the increase of its period.Tab.6 gives the availability of complex system with start BITE with different reduction of necessary maintenance time Yj.Tab.7 shows the availability of complex system with start BIT changes with different reduction of unnecessary maintenance time Zj.It can be seen that the system availability does not change obviously,because the error probability is lower,and the unnecessary maintenance is less,it can not influence the system availabi-lity significantly.Tab.8 indicates the availability of complex system with start BIT in different error probabilities.It shows that the system availability does not change significantly with the decrease of error rate.

    Tab.4 Simulation results for different types of BIT in situation 1

    Tab.5 Simulation results for different type of BIT in situation 2

    Tab.6 Simulation results for reduction of Yj

    Tab.7 Simulation results for reduction of Zj

    Tab.8 Simulation results for reduction of error probability

    3 Conclusions

    This paper analyzes the complex repairable system with BITE,puts forward a modeling and simulation approach for it,provides its specific simulation model,and the influences of diferent types of BIT,maintenance time and error probability on the system availability are simulated and evaluated by using the model.

    [1]ZHANG Yu-tao,TANG Jun,ZHANG Ming-qing,et al.Research on reliability simulation process model based on Monte Carlo method[J].System Engineering and Electronics,2008,(7):1374-1377.(in Chinese)

    [2]SHAO Yan-feng,XUE Hong-jun.Simulation for reliability analysis based on fault tree[J].Journal of Mechanical Strength,2008,(3):381 -385.(in Chinese)

    [3]SU Chun.Simulation research on system dynamic reliability based on general stochastic Petri net[J].China Mechanical Engineering,2008,(1):1 - 5.(in Chinese)

    [4]YANG Kai,Hisham Younis.A semi-analytical Monte Carlo simulation method for system’s reliability with load sharing and damage accumulation[J].Reliability Engineering and System Safety,2005,87:191-200.

    [5]YANG Yu-hang,F(xiàn)ENG Yun-cheng.Survey of reliability and availability evaluation of complex system usinng Monte Carlo techniques[J].System Engineering-theory &Practice,2003,(2):80-85.(in Chinese)

    [6]YANG Yu-hang,F(xiàn)ENG Yun-cheng.Complex repairable system reliability and maintainability simulation[J].Journal of System Simulation,2002,(8):978-986.(in Chinese)

    [7]YANG Wei-min,SHENG Yi-xing.System reliability simulation[M].Beijing:Press of Beijing University of Aeronautics and Astronautics,1990.(in Chinese)

    [8]LV Xue-zhi,YU Yong-li,CHEN Li-yong,et al.A modeling and simulation approach of complex repairable system based on simulink[J].Journal of Academy of Armored Force Engineering,2009,(4):15-20.(in Chinese)

    [9]LV Xue-zhi,YU Yong-li,LIU Chang-jiang.A modeling and simulation approach of complex repairable system based on stateflow[J].Command Control& Simulation,2009,(6):71 -75.(in Chinese)

    [10]GAN Mao-zhi,KANG Jian-she,GAO Qi.Military equipment maintenance engeering[M].Beijing:National Defence Industry Press,2005:184-186.(in Chinese)

    [11]CAO Jin-hua,CHENG Kan.Introduction of reliability mathmatics[M].2nd ed.Beijing:Higher Education Press,2006:122-134.(in Chinese)

    [12]ZHANG Wei.Stateflowlogistic system modeling[M].Xi’an:Xi’an Electronic Technology University Press,2007.(in Chinese)

    猜你喜歡
    永利
    Effect of the magnetization parameter on electron acceleration during relativistic magnetic reconnection in ultra-intense laser-produced plasma
    白象:打造有骨氣的民族品牌
    科技興邦 創(chuàng)新強(qiáng)國
    創(chuàng)新的回聲往屆兩會提案議案回訪
    奮進(jìn)的聲音
    深圳市永利種業(yè)有限公司
    辣椒雜志(2021年4期)2021-04-14 08:28:14
    研究多層螺旋CT聯(lián)合核磁共振成像應(yīng)用于腕關(guān)節(jié)損傷的影像診斷價(jià)值
    詩經(jīng)
    天津詩人(2020年3期)2020-09-24 02:20:22
    畢永利教授簡介
    Investigation on pulsed discharge mode in SF6-C2H6 mixtures
    三级毛片av免费| 特级一级黄色大片| 女人高潮潮喷娇喘18禁视频| 国产黄a三级三级三级人| 亚洲av熟女| 美女高潮的动态| 观看免费一级毛片| 亚洲久久久久久中文字幕| 麻豆成人午夜福利视频| 亚洲欧美日韩卡通动漫| 天美传媒精品一区二区| 女人十人毛片免费观看3o分钟| 琪琪午夜伦伦电影理论片6080| 男女床上黄色一级片免费看| 亚洲内射少妇av| 亚洲av一区综合| 中亚洲国语对白在线视频| 真人一进一出gif抽搐免费| 国产麻豆成人av免费视频| 国产69精品久久久久777片| 国产精品 欧美亚洲| 亚洲av成人精品一区久久| 欧美日韩国产亚洲二区| 女人高潮潮喷娇喘18禁视频| 国产高清有码在线观看视频| 亚洲国产中文字幕在线视频| 国产精品98久久久久久宅男小说| 国产精品一及| 亚洲欧美日韩高清专用| 一级毛片高清免费大全| 99国产极品粉嫩在线观看| 亚洲熟妇熟女久久| 亚洲欧美日韩高清专用| 中文字幕高清在线视频| 亚洲乱码一区二区免费版| 中文字幕人妻丝袜一区二区| 可以在线观看的亚洲视频| 国内精品久久久久精免费| 夜夜看夜夜爽夜夜摸| 熟妇人妻久久中文字幕3abv| 在线视频色国产色| 国产精品久久久久久人妻精品电影| 性欧美人与动物交配| 香蕉久久夜色| 国产精品影院久久| 亚洲真实伦在线观看| 午夜免费男女啪啪视频观看 | 丰满人妻熟妇乱又伦精品不卡| av黄色大香蕉| 看黄色毛片网站| 亚洲av五月六月丁香网| 国内精品美女久久久久久| 国产男靠女视频免费网站| 草草在线视频免费看| 长腿黑丝高跟| 69人妻影院| 99在线视频只有这里精品首页| 成年女人毛片免费观看观看9| 天堂av国产一区二区熟女人妻| 12—13女人毛片做爰片一| 长腿黑丝高跟| xxxwww97欧美| 欧美日韩精品网址| 欧美黑人欧美精品刺激| 国产中年淑女户外野战色| 小蜜桃在线观看免费完整版高清| 午夜影院日韩av| 深爱激情五月婷婷| 亚洲久久久久久中文字幕| 国产精品98久久久久久宅男小说| 18禁国产床啪视频网站| 俺也久久电影网| 久久人妻av系列| 国产午夜福利久久久久久| 国产成年人精品一区二区| 久久久色成人| 免费av观看视频| 女人高潮潮喷娇喘18禁视频| 男女视频在线观看网站免费| 精品一区二区三区av网在线观看| 国产一级毛片七仙女欲春2| 十八禁网站免费在线| 真人一进一出gif抽搐免费| 成人欧美大片| 亚洲精品一区av在线观看| 国产精品女同一区二区软件 | 麻豆国产av国片精品| 久久精品国产99精品国产亚洲性色| 法律面前人人平等表现在哪些方面| 99国产综合亚洲精品| 热99re8久久精品国产| 亚洲av不卡在线观看| 可以在线观看毛片的网站| 又黄又爽又免费观看的视频| 色老头精品视频在线观看| 亚洲国产精品999在线| 亚洲狠狠婷婷综合久久图片| 黄片大片在线免费观看| 亚洲精品456在线播放app | 亚洲av成人不卡在线观看播放网| 欧美在线黄色| 19禁男女啪啪无遮挡网站| 亚洲五月天丁香| 午夜激情福利司机影院| 精品99又大又爽又粗少妇毛片 | 性色avwww在线观看| 日本黄色片子视频| 国产激情欧美一区二区| 午夜福利在线观看免费完整高清在 | 激情在线观看视频在线高清| 99精品欧美一区二区三区四区| 精品熟女少妇八av免费久了| 天天一区二区日本电影三级| 在线免费观看的www视频| 精品一区二区三区视频在线 | 成人午夜高清在线视频| 国产av一区在线观看免费| 国产99白浆流出| 国产亚洲欧美在线一区二区| 亚洲国产中文字幕在线视频| 国产爱豆传媒在线观看| 精品免费久久久久久久清纯| 两个人看的免费小视频| 一区二区三区高清视频在线| 亚洲av第一区精品v没综合| 久久伊人香网站| 精品一区二区三区视频在线观看免费| 欧美一区二区国产精品久久精品| 熟女少妇亚洲综合色aaa.| 变态另类成人亚洲欧美熟女| 综合色av麻豆| 国产久久久一区二区三区| 不卡一级毛片| 国产精品女同一区二区软件 | 老司机午夜福利在线观看视频| 波野结衣二区三区在线 | 日韩欧美国产在线观看| 日韩欧美国产一区二区入口| 午夜老司机福利剧场| 中文字幕久久专区| 精华霜和精华液先用哪个| 亚洲五月天丁香| 日韩大尺度精品在线看网址| av国产免费在线观看| 午夜老司机福利剧场| 国产欧美日韩精品一区二区| 男女下面进入的视频免费午夜| 男人的好看免费观看在线视频| 国产av麻豆久久久久久久| 日本与韩国留学比较| 丝袜美腿在线中文| 两个人看的免费小视频| 丁香欧美五月| 在线观看日韩欧美| 特级一级黄色大片| 天堂√8在线中文| 成年免费大片在线观看| 欧美日韩综合久久久久久 | 热99在线观看视频| 午夜激情福利司机影院| 国产精品一区二区三区四区免费观看 | 国产精品亚洲av一区麻豆| 波野结衣二区三区在线 | 国产 一区 欧美 日韩| 午夜福利高清视频| 狠狠狠狠99中文字幕| 最近最新中文字幕大全电影3| 91字幕亚洲| 女人十人毛片免费观看3o分钟| 日本一本二区三区精品| 91av网一区二区| a在线观看视频网站| 看黄色毛片网站| 亚洲片人在线观看| 1024手机看黄色片| 国产黄片美女视频| 久久久久九九精品影院| 看黄色毛片网站| 国内揄拍国产精品人妻在线| 热99re8久久精品国产| 欧美日韩瑟瑟在线播放| 国产黄a三级三级三级人| 欧美一级毛片孕妇| 成人av一区二区三区在线看| 日本 欧美在线| 国产av麻豆久久久久久久| 国产真人三级小视频在线观看| 欧美乱妇无乱码| 国产午夜精品论理片| 香蕉av资源在线| 一进一出抽搐动态| 欧美三级亚洲精品| 久久久久久久精品吃奶| 国产亚洲精品综合一区在线观看| 精品乱码久久久久久99久播| 成人亚洲精品av一区二区| 悠悠久久av| 18禁美女被吸乳视频| 久久国产精品人妻蜜桃| 日本与韩国留学比较| 男插女下体视频免费在线播放| 91在线观看av| 长腿黑丝高跟| 欧美另类亚洲清纯唯美| av天堂在线播放| 99riav亚洲国产免费| 亚洲午夜理论影院| 波多野结衣高清作品| 少妇的丰满在线观看| 精品国产超薄肉色丝袜足j| 亚洲av一区综合| 国产成人a区在线观看| 少妇人妻一区二区三区视频| 亚洲五月婷婷丁香| 免费无遮挡裸体视频| 久久久久久国产a免费观看| 国产精品久久电影中文字幕| 无遮挡黄片免费观看| 午夜福利视频1000在线观看| 白带黄色成豆腐渣| 国产精品自产拍在线观看55亚洲| 免费观看精品视频网站| 国产91精品成人一区二区三区| 最新在线观看一区二区三区| 国产高潮美女av| 日日干狠狠操夜夜爽| 美女被艹到高潮喷水动态| 国产主播在线观看一区二区| 久久久国产成人精品二区| 国产极品精品免费视频能看的| 国产黄色小视频在线观看| 亚洲精品日韩av片在线观看 | 黄色日韩在线| 岛国在线免费视频观看| 亚洲一区二区三区不卡视频| 琪琪午夜伦伦电影理论片6080| svipshipincom国产片| 国产精品影院久久| 熟女人妻精品中文字幕| 亚洲精品在线美女| 日本 欧美在线| 久久久久免费精品人妻一区二区| 国产欧美日韩精品亚洲av| 精品久久久久久成人av| 国产精品影院久久| 熟女人妻精品中文字幕| 不卡一级毛片| 午夜福利视频1000在线观看| 老熟妇乱子伦视频在线观看| 欧美性感艳星| 看黄色毛片网站| 亚洲,欧美精品.| 亚洲av不卡在线观看| 亚洲 国产 在线| 男插女下体视频免费在线播放| 国产精品乱码一区二三区的特点| 乱人视频在线观看| 日日摸夜夜添夜夜添小说| 免费av毛片视频| 国产成人欧美在线观看| 婷婷精品国产亚洲av在线| 亚洲成av人片免费观看| 国产精品99久久99久久久不卡| 国产精品自产拍在线观看55亚洲| 午夜视频国产福利| 在线免费观看的www视频| 成熟少妇高潮喷水视频| 91av网一区二区| 狂野欧美白嫩少妇大欣赏| 久久香蕉精品热| 精品免费久久久久久久清纯| 国产精品99久久久久久久久| 听说在线观看完整版免费高清| 日韩大尺度精品在线看网址| 欧美黑人欧美精品刺激| 观看免费一级毛片| 18禁国产床啪视频网站| 久久久久精品国产欧美久久久| 日韩欧美精品v在线| 久99久视频精品免费| 九九在线视频观看精品| 亚洲精品影视一区二区三区av| 好看av亚洲va欧美ⅴa在| 少妇的逼好多水| www.熟女人妻精品国产| 日本 av在线| 成人鲁丝片一二三区免费| 伊人久久大香线蕉亚洲五| 十八禁人妻一区二区| 岛国在线观看网站| 我要搜黄色片| 久久精品亚洲精品国产色婷小说| 欧美一区二区国产精品久久精品| 免费观看精品视频网站| 亚洲精品美女久久久久99蜜臀| 内地一区二区视频在线| 久久精品夜夜夜夜夜久久蜜豆| 亚洲一区高清亚洲精品| 亚洲精品一区av在线观看| 在线观看免费午夜福利视频| 亚洲电影在线观看av| 中亚洲国语对白在线视频| 亚洲欧美日韩东京热| 淫秽高清视频在线观看| 免费在线观看日本一区| 亚洲av成人av| 夜夜躁狠狠躁天天躁| 国产精品,欧美在线| 国产成人啪精品午夜网站| 午夜影院日韩av| 51国产日韩欧美| 国产一区二区三区视频了| 午夜福利在线观看吧| 激情在线观看视频在线高清| 99久久无色码亚洲精品果冻| 亚洲av五月六月丁香网| 欧美成人a在线观看| 岛国在线观看网站| 欧美在线一区亚洲| 免费无遮挡裸体视频| 91在线精品国自产拍蜜月 | 精品日产1卡2卡| 欧美又色又爽又黄视频| 亚洲欧美激情综合另类| 婷婷精品国产亚洲av在线| 女警被强在线播放| 又粗又爽又猛毛片免费看| 18禁裸乳无遮挡免费网站照片| 黄色日韩在线| www.www免费av| 黄色日韩在线| 亚洲精品久久国产高清桃花| 国产视频一区二区在线看| 欧美黑人巨大hd| 伊人久久精品亚洲午夜| 欧美zozozo另类| 天天一区二区日本电影三级| 99国产精品一区二区蜜桃av| 国产乱人伦免费视频| 欧美激情在线99| 757午夜福利合集在线观看| 免费大片18禁| 99国产精品一区二区三区| 超碰av人人做人人爽久久 | 亚洲国产欧美人成| 午夜视频国产福利| 国产精品自产拍在线观看55亚洲| 一本综合久久免费| 搡老妇女老女人老熟妇| 久久久久国产精品人妻aⅴ院| 男女之事视频高清在线观看| 日韩精品中文字幕看吧| 免费人成视频x8x8入口观看| 老熟妇乱子伦视频在线观看| 91在线精品国自产拍蜜月 | 一边摸一边抽搐一进一小说| 国产精品亚洲一级av第二区| 美女cb高潮喷水在线观看| 国产视频一区二区在线看| 亚洲精品久久国产高清桃花| 亚洲精品在线美女| 国产真实乱freesex| 一区二区三区高清视频在线| 少妇人妻精品综合一区二区 | 国产主播在线观看一区二区| 精品久久久久久久久久久久久| 久久精品国产亚洲av香蕉五月| 法律面前人人平等表现在哪些方面| 在线观看一区二区三区| 色尼玛亚洲综合影院| 国产精品av视频在线免费观看| 日本三级黄在线观看| 黄色女人牲交| 国产 一区 欧美 日韩| 亚洲,欧美精品.| 精品久久久久久久久久免费视频| 亚洲内射少妇av| 国产av麻豆久久久久久久| 国产亚洲欧美在线一区二区| 91九色精品人成在线观看| 听说在线观看完整版免费高清| 91九色精品人成在线观看| 偷拍熟女少妇极品色| 国产熟女xx| 欧美日韩乱码在线| 亚洲国产精品合色在线| 精品久久久久久久末码| 国产亚洲精品久久久久久毛片| 久久久久国内视频| 欧美日韩黄片免| 99在线视频只有这里精品首页| 久久久久久人人人人人| 美女 人体艺术 gogo| 九九在线视频观看精品| 国产黄a三级三级三级人| 一个人免费在线观看的高清视频| 少妇的丰满在线观看| 亚洲 欧美 日韩 在线 免费| 欧美性猛交╳xxx乱大交人| 国产成人啪精品午夜网站| 啦啦啦免费观看视频1| 国产69精品久久久久777片| 又粗又爽又猛毛片免费看| 欧美成狂野欧美在线观看| 老司机在亚洲福利影院| 亚洲av电影在线进入| 可以在线观看毛片的网站| 欧美黄色片欧美黄色片| 欧洲精品卡2卡3卡4卡5卡区| 一进一出抽搐gif免费好疼| 十八禁人妻一区二区| 欧美+日韩+精品| 亚洲内射少妇av| 日本三级黄在线观看| 国产午夜精品久久久久久一区二区三区 | 久久欧美精品欧美久久欧美| 男人的好看免费观看在线视频| 欧美不卡视频在线免费观看| 51午夜福利影视在线观看| 中文字幕av在线有码专区| 亚洲av免费在线观看| 国产av一区在线观看免费| 午夜a级毛片| 午夜激情福利司机影院| 亚洲一区二区三区色噜噜| 十八禁人妻一区二区| 黄色成人免费大全| 母亲3免费完整高清在线观看| 又黄又粗又硬又大视频| or卡值多少钱| 美女被艹到高潮喷水动态| 国产私拍福利视频在线观看| 亚洲精品乱码久久久v下载方式 | 国产精品久久久久久人妻精品电影| 成人永久免费在线观看视频| 色综合欧美亚洲国产小说| 99在线视频只有这里精品首页| 亚洲欧美日韩东京热| 哪里可以看免费的av片| 国产久久久一区二区三区| 欧美av亚洲av综合av国产av| 在线观看日韩欧美| 小说图片视频综合网站| 狠狠狠狠99中文字幕| 在线播放无遮挡| 国产国拍精品亚洲av在线观看 | 在线观看免费视频日本深夜| 国产伦人伦偷精品视频| 午夜免费男女啪啪视频观看 | 99在线视频只有这里精品首页| 亚洲成人免费电影在线观看| 日本 欧美在线| 又黄又爽又免费观看的视频| 一个人免费在线观看电影| 国产久久久一区二区三区| 国产成+人综合+亚洲专区| 色综合站精品国产| 看片在线看免费视频| 久久久久久国产a免费观看| 高潮久久久久久久久久久不卡| 国产高清视频在线观看网站| 亚洲在线观看片| 长腿黑丝高跟| 最近最新中文字幕大全电影3| 一进一出好大好爽视频| 熟女少妇亚洲综合色aaa.| 成人三级黄色视频| 日本撒尿小便嘘嘘汇集6| 国产精品久久久久久亚洲av鲁大| 18禁黄网站禁片午夜丰满| 一进一出抽搐gif免费好疼| 别揉我奶头~嗯~啊~动态视频| 身体一侧抽搐| 午夜精品在线福利| 精品一区二区三区视频在线观看免费| 最后的刺客免费高清国语| 婷婷精品国产亚洲av| 亚洲 欧美 日韩 在线 免费| 色精品久久人妻99蜜桃| 少妇熟女aⅴ在线视频| 亚洲av第一区精品v没综合| 久久精品国产亚洲av涩爱 | 成人三级黄色视频| 欧美丝袜亚洲另类 | 国产高清三级在线| 国内揄拍国产精品人妻在线| 成熟少妇高潮喷水视频| 五月伊人婷婷丁香| 少妇的丰满在线观看| 久久国产乱子伦精品免费另类| 成年免费大片在线观看| 久久人人精品亚洲av| 日本黄色片子视频| 亚洲自拍偷在线| 夜夜夜夜夜久久久久| 午夜免费成人在线视频| 很黄的视频免费| 精品人妻1区二区| 桃色一区二区三区在线观看| 国产精品久久久久久亚洲av鲁大| 国产成人av教育| 男人舔奶头视频| av片东京热男人的天堂| 人人妻人人澡欧美一区二区| 夜夜夜夜夜久久久久| 亚洲自拍偷在线| 狂野欧美激情性xxxx| 亚洲欧美日韩无卡精品| 亚洲精品456在线播放app | 欧美日本视频| 国产精品精品国产色婷婷| 国产成+人综合+亚洲专区| 国产黄色小视频在线观看| 天天一区二区日本电影三级| 成人午夜高清在线视频| 老熟妇乱子伦视频在线观看| 欧美黑人巨大hd| 精品不卡国产一区二区三区| 成人无遮挡网站| 日韩中文字幕欧美一区二区| 免费观看的影片在线观看| 欧美三级亚洲精品| 国产精品嫩草影院av在线观看 | 黄片大片在线免费观看| 国产极品精品免费视频能看的| 男人和女人高潮做爰伦理| 日韩欧美 国产精品| 免费观看的影片在线观看| 色哟哟哟哟哟哟| 亚洲最大成人手机在线| 精品国产超薄肉色丝袜足j| 一本一本综合久久| 身体一侧抽搐| 精品熟女少妇八av免费久了| 在线观看av片永久免费下载| 欧美日韩一级在线毛片| 欧美+亚洲+日韩+国产| e午夜精品久久久久久久| 亚洲国产精品999在线| 成熟少妇高潮喷水视频| 国产精品香港三级国产av潘金莲| 精品99又大又爽又粗少妇毛片 | 国产午夜精品论理片| 欧美日韩乱码在线| 亚洲欧美日韩东京热| 欧美黑人巨大hd| 午夜两性在线视频| 麻豆国产av国片精品| 久久精品人妻少妇| 三级毛片av免费| 国产精品影院久久| 桃色一区二区三区在线观看| 精华霜和精华液先用哪个| 久久精品国产99精品国产亚洲性色| 啦啦啦免费观看视频1| 欧美中文综合在线视频| 亚洲激情在线av| 最近最新中文字幕大全电影3| 欧美黑人欧美精品刺激| 成人欧美大片| 嫩草影院精品99| 搞女人的毛片| 最近最新中文字幕大全免费视频| 老熟妇乱子伦视频在线观看| 色精品久久人妻99蜜桃| 在线观看免费视频日本深夜| 国产成人影院久久av| 三级国产精品欧美在线观看| 黄色片一级片一级黄色片| 2021天堂中文幕一二区在线观| 婷婷丁香在线五月| 色综合亚洲欧美另类图片| 国内精品久久久久精免费| 丰满乱子伦码专区| 91九色精品人成在线观看| 亚洲av熟女| 中文亚洲av片在线观看爽| 久9热在线精品视频| 久久欧美精品欧美久久欧美| www国产在线视频色| 亚洲片人在线观看| 国产又黄又爽又无遮挡在线| 少妇的逼好多水| 国产熟女xx| 免费搜索国产男女视频| 成人特级黄色片久久久久久久| 别揉我奶头~嗯~啊~动态视频| 女人高潮潮喷娇喘18禁视频| 特大巨黑吊av在线直播| 国产真人三级小视频在线观看| av黄色大香蕉| 九色成人免费人妻av| 91九色精品人成在线观看| 女人十人毛片免费观看3o分钟| 在线观看免费视频日本深夜| 99精品久久久久人妻精品| 亚洲美女黄片视频| 日本在线视频免费播放| 亚洲国产欧洲综合997久久,| 亚洲午夜理论影院| 99国产精品一区二区蜜桃av| 精品国产超薄肉色丝袜足j| 99riav亚洲国产免费| 国产乱人视频| 婷婷丁香在线五月| 国产精品,欧美在线| 久久久久久久久中文| 超碰av人人做人人爽久久 | 久久精品国产清高在天天线| 成人欧美大片| 观看美女的网站| 女同久久另类99精品国产91| 久99久视频精品免费| 18禁黄网站禁片免费观看直播| 观看免费一级毛片|