• <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 ?

    Erosion thermocouple temperature acquisition system

    2013-11-01 01:26:20WANGFeiyue王飛躍ZHANGZhijie張志杰WANGWenlian王文廉

    WANG Fei-yue(王飛躍), ZHANG Zhi-jie(張志杰), WANG Wen-lian(王文廉)

    (College of Information and Communication Engineering, North University of China, Taiyuan 030051, China)

    Erosion thermocouple temperature acquisition system

    WANG Fei-yue(王飛躍), ZHANG Zhi-jie(張志杰), WANG Wen-lian(王文廉)

    (College of Information and Communication Engineering, North University of China, Taiyuan 030051, China)

    Aiming at high requirements of temperature measurement system in high temperature, high pressure, highly corrosive and other special environments, a temperature acquisition system based on field-programmable gate array (FPGA) which is the controller of the system is designed. Also a Flash memory is used as the memory and an erosion thermocouple is used as sensor of the system. Compared with the traditional system using complex programmable logic device (CPLD) and microcontroller unit (MCU) as the main body, this system has some advantages, such as short response time, small volume, no loss of data once power is off, high precision, stability and reliability. And the sensor of the system can be reused. In this paper, boiling water experiment is used to verify accuracy of the system. The millisecond level signal from firecrackers is for verifying the stability and fast response characteristics of the system. The results of experiment indicate that the temperature measurement system is more suitable for the field of explosion and other environments which have high requirements for the system.

    Tungsten-Rhenium thermocouple; field-programmable gate array (FPGA); Flash memory

    0 Introduction

    The transient temperature measurement technology is always the key research at home and abroad, and the tested objects often occur in bad environment such as high temperature, high pressure, high corrosion and so on. Therefore there are higher requirements for the sensor and its measurement system. Recently, the system has greatly improved on the basis of the traditional temperature measurement system, by using single chip micyoco (SCM) and complex programmable logic device (CPLD) as controller, static random access memory (SRAM) for storage. Its advantages including upgrading and function expansion esaily, no loss of data when power goes off, higher stability and reliability, and response of the sensor is controlled and sensor is reused, etc[1-3].

    This design uses erosion-type thermocouple applying to the explosion field with high corrosion resistance, high temperature and high pressure, which includes the thermocouple temperature sensor, signal disposal amplifier circuit, temperature compensation circuit, AD converter, Flash memory module, field programmable gate array (FPGA) controller circuit, and the battery[4-6]. The research is processed on how to obtain the rapid response and modular of the system program controller.

    1 Overall design of the system

    By analyzing the principle of thermocouple, the temperature acquisition system is designed using thermocouple, as shown in Fig.1.

    In Fig.1, a powerful and high integrated programmable logic device, FPGA, is used as the core of the temperature measurement system which has a C expensive rhenium tungsten thermocouple temperature sensor of NANMAC company as the front end. When the sensor senses the temperature, the temperature signals are converted into electrical signals. After signals being conditioned, passing through AD, they are converted into 12-bit digital signals. After processed by first-in-first-out (FIFO) and FPGA, signals are compared and judged by the internal trigger module. According to the trigger state, FPGA takes corresponding control strategy on AD, FIFO and Flash module. Eventually, the data is stored in Flash memory. Data is extracted from Flash memory by FT245 via the internal USB control module of FPGA when reading. By FT245, the data is transferred to PC. Finally, the whole process of acquiring, storage and reading is completed. Here, 0, 1, 2, 5, 10, 20, 50 and 100 constitute the amplification coefficients of analog circuit of the system. The Flash memory has a storage capacity of 8 MB. The sampling frequency of AD is divided into 100 kHz, 500 kHz, 1 MHz, 2 MHz, which is adjustable. Also the negative delay is adjustable. CY7C4261V is a FIFO with a storage capacity of 16 KB.

    Fig.1 Principle diagram of the system

    2 Hardware circuit

    2.1 Process and method of rapid responding erosion-type thermocouple

    For self-updating thermocouples, some preparations must be done to make the thermocouple respond quickly. There are several methods to get quick response of the thermocouple.

    The erosion thermocouple node ( self-updating thermocouple) is gained by grinding the end of sensor. This kind of connection form of nodes can make erosion thermocouple achieve a millisecond or even microsecond response time. Because of the special node, special attention has to be paid to the measurement of node resistance.

    Turning the nodes (a line looks like a hair) of the thermocouple towards the flowing gas or liquid with 45°, according to description of the data sheet for erosion, is the suitable operation. This placement of the node makes sure that the erosion characteristics are maximized. If the induction end of thermocouple is oxidized, scratched or covered, the surface of induction end can be repaired by grinding.

    If the loop resistance R1 of the thermocouple is more than lead resistance R2 plus 2-10 Ω (depending on wire length), new nodes have to be made. The specific procedure is as follows: Put a No.80 corundum sand paper (or alumina sand paper) on the smooth and hard surface. Make the thermocouple probe perpendicular to the ground at 45° toward the line of the node so as to grind conveniently. Grinding distance is 2-5 cm. Polishing with sand paper should be in the same direction but no dragging. Check the resistance of the nodes regularly, until achieving a stable consistent resistance (plus lead resistance) 2-10 Ω. This is the loop resistance of node. Chill the sensor for 10 s before the resistance measurement. In this way, we can get 10-20 ms response time easily when the temperature changes in levels.

    To get a shorter response time, we can change size of the particles for scrubbing. Microsecond response can be got by using sand paper with grain of sand until the node is ground out. Once a node is polished out, the loop resistance will be greater than 1 000 Ω, which needs to use No.280-No.320 sand paper. Then there will be some high unstable resistance. Sand paper, a little thicker, can be used to gain a new node in the next step. Once the node resistance approaches about 8-12 Ω (depending on wire length), it will become the minimum/fastest thermocouple node, which creates the distinctive erosion type thermocouples. Any impurity or sediment cannot be in contact with induction head in use, or response time of the thermocouple will be increased, even touch of the sweat from skin could reduce the sensitivity. So it is important to keep the induction end under test clean.

    Whether the thermocouple can be used correctly has a great influence upon the test results. If erosion type thermocouple is not polished following the steps above, we cannot get the ideal data or curve when the sensor is reused in the case of no grinding. Even considerable errors may be resulted.

    2.2 Analog signal processing circuit

    The analog signal processing circuit is shown in Fig.2. The circuit mainly includes power management, amplification, bias filter and temperature compensation. Working process of the analog circuit is as follows: When the thermocouple feels the outside temperature, the temperature signal is transferred into a potential signal, and the signal is transmitted to AD in the digital module after magnified and filtered by signal conditioning circuit.

    Fig.2 Analog signal processing circuit

    The output voltage of power management is ±5 V. The signal is magnified 55 times by the first and second stages of the signal amplification circuit. The third stage is a programmable amplifier with eight adjustable magnifications which is followed by biasing circuit and second-order active filter. The cutoff frequency is

    (1)

    The result of calculation is f=194 kHz.

    Output of the thermocouple is so small that impact of the drift to circuit voltage cannot be ignored. To improve precision of the system and reduce the voltage drift, high-precision resistance should be used in the circuit.

    2.3 Digital signal processing circuit

    Working process of digital signal processing circuit is as follows: Signal is transmitted to FIFO from the signal disposal section via AD and judged by FPGA. If the signal is greater than trigger level, the system begins to record useful data. System makes AD dormancy when the required data is enough. Then FIFO and Flash memory stop counting. After that, tie data is saved to the Flash memory eventually. The computer can read data at any time from Flash memory. The specific processes of digital signal processing circuit are shown in Fig.3.

    Fig.3 Digital signal processing circuit module

    The digital signal processing circuit includes power management, FPGA master controller, AD converter, FIFO and 256 MB Flash memory.

    Power supply of 5V is supplied by power management circuit using LP2985. Voltages of 3.3 V and 1.2 V are supplied by TPS75003. They help the demands of FPGA, Flash, FIFO, FT245 and other chips to work well.

    AD7482 is a digital-to-analog converter. Sampling rate is programmably set by AD controller module of FPGA, which includes 100 kHz, 500 kHz, 1 MHz and 2 MHz and is adjustable. It meets the requirements of different applications and data, which is widespread and ease of use.

    The system uses Flash memory to store data avoding loss of data when power is off, which makes the system more suitable for the high-temperature, high-pressure and high-radiation harsh environment just like explosion field[7-9].

    FIFO, which is conveniently controlled, not only makes the system get a data cache, but also makes it achieve negative delay of data. It ensures that the system saves 16 KB data before triggering, and it makes the data more reliable and more complete.

    Devices above have corresponding function modules in FPGA and are programmed with hardware description language (VHDL). The traditional system with CPLD as a controller has not realized the function of the modularization in programming, which makes the program huge and muddled. The system cannot be optimized and improved expediently and is also shaky in reliability. Programming modules for AD controller, negative delay, FIFO control, Flash Memory reading and writing control and USB communication are convenient for system to upgrade, which makes the control of system more stable.

    3 Overall flow chart based on FPGA

    The system uses FPGA of the Spartan 3E series as controller. The controller is programmed with VHDL language, and machine of the data reading and writing is shown in Fig.4. The resources of FPGA is larger than CPLD, which solves problems of the traditional temperature test system with CPLD such as the system upgrade and more resources. Furthermore, table structure search makes the FPGA attain faster speed and stronger operation ability.

    Fig.4 FPGA control flow chart

    4 Experimental results and analysis

    Fig.5 shows the experimental results. In Fig.5, the horizontal coordinate is time value and each lattice is 500 ms, the value of y-coordinate is bit. In the front, the level baseline value is 2 048 bit, and the full scale is 4 096 bit. The maximum of curve is 3 072 bit. Do the test trials with firecrackers, set the systematic magnification to 2 times, fix thermocouple, cut off half of the firecracker, show the gunpowder, aim at the thermocouple sensitive surface, fire the firecracker, and read data by temperature testing system of LabVIEW. The value of a signal obtained is Y=3 072 bit. The output voltage of sensor is calculated by

    Fig.5 Temperature response curve

    (2)

    The unit of U is mV. Put Y=3 072 bit into Eq.(2), then U=5.586 mV. By comparing the sensor thermocouple indexing table, the temperature is got, Z1=354 ℃. Output value of the cold end temperature sensor DS600 is X=188 bit, and the formula is

    The unit of Z2is degree. Put X into Eq.(3),then Z2= 15 ℃. Z1is just the difference between burning temperature of the gunpowder and cold end temperature, so the real temperature is Z1and Z2.

    The boiling water from water fountain is used in water temperature testing. The thermocouple is inserted into hot water under test. The thermocouple should be taken out of water two min later after the system is triggered. Reading data by program temperature testing system of LabVIEW, value of the signal obtained is Y=2 194 bit. Put Y into Eq.(2), then U=0.810 mV. By comparing the sensor thermocouple indexing table, T1=61 ℃ is got. Output value of the cold end temperature sensor is X=204 bit. Put X into Eq.(3), then T=23 ℃. So the measured temperature of hot water is 84 ℃. Actual temperature of the water from water fountain is 85 ℃ which is given by a thermometer. Thus, the result is proved to be reliable and the temperature acquisition system is accurate enough[10,11].

    5 Conclusion

    According to the bad environment (such as shooting range, high temperature furnace, etc), the erosion thermocouple temperature acquisition system is designed in this paper, and the process and method of fast response are researched. Effectiveness of the system is proved by the firecrackers experiment. Compared with the traditional system with CPLD, single chip and SRAM memory, advantages of this system are such as faster response time, smaller size, higher accuracy, data retainment when power goes off, higher stability and reliability, more adequate function expansion space of FPGA, sensor reusing, more suitable for the environment with high temperature and pressure, such as the explosion field.

    [1] Monica A C. Temperature measurement and acquisition system with smart temperature sensor. Serie Electrotechnique et Energetique, 2004, 49(1): 143-150.

    [2] Grempler K. An improved airborne ocean temperature acquisition display and ananlysis system. Johns Hopkins Apl Technical Digest, 1993, 14(3): 253-258.

    [3] LI Gong-qi, LI Dong-guang. Based on the high-speed CPLD the missile test system storage key techniques. Journal of theArrows and Guidance, 2007, 27(1): 360-362.

    [4] KONG Wen-chuang, WANG Dai-hua, ZHANG Zhi-jie. A new temperature collection system. Nuclear Electronics & Detection Technology, 2011, 31(1): 73-78.

    [5] REN Quan-hui, MA Lei. Design and implementation of temperature acquisition system based on FPGA and AT89C2051. Coal Technology, 2011, 12: 48-50.

    [6] WU Lei, SHEN Shi-tao, GUO Chao-ping, et al. Design of embedded temperature acquisition system based on USB and FPGA. Journal of Computer Applications, 2011, 31(2): 222-224.

    [7] ZU Yi-kang. Multiplex temperature collection system based on type-k thermocouple and MAX6675. Journal of Jiangxi University of Science and Technology, 2007, 4: 25-27.

    [8] PAN Xue-tao, LI Lang, MENG Qing-yang, et al. Design of thermocouple temperature measurement system based on virtual instruments and USB technology. Computer Measurement & Control, 2011, 10: 2340-2343.

    [9] TAO Wei-wei, LIU Ying-jie, XI Zhen-hua, et al. Wireless building temperature gathering system based on CC1110. Microcomputer & Its Applications, 2012, 1: 19-22.

    [10] CHEN Ming-bao. Research on hardware performance for thermocouple temperature measurement modules. Automation & Instrumentation, 2012, 6: 16-20.

    [11] ZHEN Guo-yong, WANG Xiang-ling, HOU Zhuo. Signal processing circuit of temperature measurement based on thermocouple. Nuclear Electronics & Detection Technology, 2012, 32(3): 269-271.

    date: 2012-10-25

    Natural Science Foundation of Shanxi Province (No. 2009011023)

    WANG Fei-yue (wangfeiyue1985@163)

    CLD number: TP274+.2 Document code: A

    1674-8042(2013)01-0014-05

    10.3969/j.issn.1674-8042.2013.01.004

    АⅤ资源中文在线天堂| 精品99又大又爽又粗少妇毛片 | 午夜免费男女啪啪视频观看 | 国产黄片美女视频| 亚洲成人中文字幕在线播放| 国产精品精品国产色婷婷| 欧美日韩福利视频一区二区| 亚洲av中文字字幕乱码综合| 91久久精品电影网| 一二三四社区在线视频社区8| 最后的刺客免费高清国语| 精品日产1卡2卡| 欧美激情国产日韩精品一区| 日韩欧美国产一区二区入口| 国产一区二区三区在线臀色熟女| 两人在一起打扑克的视频| 99久久精品一区二区三区| 午夜福利在线观看免费完整高清在 | 日本一二三区视频观看| 又黄又爽又刺激的免费视频.| 亚洲精品一卡2卡三卡4卡5卡| 久久国产乱子免费精品| 99国产精品一区二区蜜桃av| 欧洲精品卡2卡3卡4卡5卡区| 国产老妇女一区| 草草在线视频免费看| 一区二区三区四区激情视频 | 国产欧美日韩一区二区三| 欧美在线一区亚洲| 中出人妻视频一区二区| 久久久久久久久久成人| 亚洲成人中文字幕在线播放| 天天躁日日操中文字幕| 久久国产精品人妻蜜桃| 一区二区三区高清视频在线| 国产黄a三级三级三级人| 久久久色成人| 国产在线男女| 婷婷精品国产亚洲av在线| 亚洲国产欧美人成| 午夜激情福利司机影院| 内射极品少妇av片p| 国产男靠女视频免费网站| 90打野战视频偷拍视频| 久久久国产成人精品二区| netflix在线观看网站| 又粗又爽又猛毛片免费看| 女生性感内裤真人,穿戴方法视频| 国产淫片久久久久久久久 | 久久婷婷人人爽人人干人人爱| 99国产精品一区二区蜜桃av| 国产久久久一区二区三区| 看十八女毛片水多多多| 国产91精品成人一区二区三区| 亚洲精华国产精华精| 免费黄网站久久成人精品 | 久久久国产成人免费| 国内精品久久久久精免费| 成年女人看的毛片在线观看| 免费高清视频大片| 欧美成狂野欧美在线观看| 亚洲人成网站高清观看| 嫩草影视91久久| 国产国拍精品亚洲av在线观看| 1024手机看黄色片| 看免费av毛片| 国产午夜精品久久久久久一区二区三区 | 国产精品一区二区三区四区免费观看 | 一个人看视频在线观看www免费| 2021天堂中文幕一二区在线观| 嫩草影院精品99| 免费在线观看亚洲国产| 日韩精品中文字幕看吧| 精品乱码久久久久久99久播| 一进一出抽搐动态| 99国产精品一区二区三区| 国产真实伦视频高清在线观看 | 色av中文字幕| 久久精品91蜜桃| 亚洲,欧美精品.| 久久性视频一级片| 精品一区二区三区av网在线观看| 日韩欧美国产一区二区入口| 日韩av在线大香蕉| 淫妇啪啪啪对白视频| 国产精品一区二区性色av| 九色成人免费人妻av| 三级毛片av免费| 日韩欧美在线乱码| 男女下面进入的视频免费午夜| 夜夜爽天天搞| 国产色婷婷99| 欧美+亚洲+日韩+国产| 舔av片在线| 成人鲁丝片一二三区免费| 成人av一区二区三区在线看| 美女xxoo啪啪120秒动态图 | 国产一区二区亚洲精品在线观看| 欧美成人免费av一区二区三区| 国语自产精品视频在线第100页| 日韩欧美一区二区三区在线观看| 精品人妻熟女av久视频| 久久久久免费精品人妻一区二区| 草草在线视频免费看| 亚洲五月婷婷丁香| 免费在线观看日本一区| 亚洲av成人不卡在线观看播放网| 88av欧美| 亚洲精品影视一区二区三区av| 老司机深夜福利视频在线观看| 91午夜精品亚洲一区二区三区 | 久久国产乱子免费精品| 琪琪午夜伦伦电影理论片6080| 嫁个100分男人电影在线观看| 久久久国产成人精品二区| 18+在线观看网站| 波野结衣二区三区在线| 亚洲精品在线观看二区| 国产精品三级大全| 精品人妻熟女av久视频| 成人一区二区视频在线观看| 国产精品乱码一区二三区的特点| 精品不卡国产一区二区三区| 日韩中字成人| 国产国拍精品亚洲av在线观看| 久久午夜福利片| 最新在线观看一区二区三区| 人妻久久中文字幕网| 免费黄网站久久成人精品 | 久久亚洲精品不卡| 久久亚洲真实| 国产色爽女视频免费观看| 免费无遮挡裸体视频| 最新中文字幕久久久久| 女人十人毛片免费观看3o分钟| 久久天躁狠狠躁夜夜2o2o| 国产亚洲欧美98| 欧美潮喷喷水| 成人特级黄色片久久久久久久| 九九久久精品国产亚洲av麻豆| 亚洲精品粉嫩美女一区| 久久久色成人| 九色国产91popny在线| 亚洲国产高清在线一区二区三| 男女床上黄色一级片免费看| 免费观看的影片在线观看| 国产色爽女视频免费观看| 婷婷精品国产亚洲av| 久久久久亚洲av毛片大全| 亚洲av免费在线观看| www.www免费av| 三级毛片av免费| 国产成+人综合+亚洲专区| 日韩人妻高清精品专区| 国产精品,欧美在线| 欧美zozozo另类| 免费黄网站久久成人精品 | 亚洲av一区综合| 国产视频内射| 窝窝影院91人妻| 97碰自拍视频| 亚洲内射少妇av| 日韩高清综合在线| 欧美另类亚洲清纯唯美| 国产精品电影一区二区三区| 国产乱人视频| 一区福利在线观看| 少妇裸体淫交视频免费看高清| 午夜福利在线观看吧| x7x7x7水蜜桃| 国内久久婷婷六月综合欲色啪| 真实男女啪啪啪动态图| 老熟妇乱子伦视频在线观看| 神马国产精品三级电影在线观看| 国产视频一区二区在线看| 日本免费一区二区三区高清不卡| 欧美激情久久久久久爽电影| 欧美激情久久久久久爽电影| 1000部很黄的大片| 国产精品免费一区二区三区在线| av在线天堂中文字幕| 简卡轻食公司| 亚洲人成网站高清观看| 亚洲精品一卡2卡三卡4卡5卡| 美女免费视频网站| 亚洲激情在线av| 九色成人免费人妻av| 中亚洲国语对白在线视频| 亚洲欧美精品综合久久99| 丁香六月欧美| 亚洲成人免费电影在线观看| 91午夜精品亚洲一区二区三区 | 日韩中文字幕欧美一区二区| 91麻豆精品激情在线观看国产| 日日干狠狠操夜夜爽| 亚洲一区高清亚洲精品| 日日夜夜操网爽| 在线十欧美十亚洲十日本专区| 精品人妻1区二区| 免费av毛片视频| 91在线精品国自产拍蜜月| 国产亚洲欧美98| 亚洲国产精品合色在线| 成人av一区二区三区在线看| 国产精品一及| 亚洲七黄色美女视频| 日韩高清综合在线| 99热6这里只有精品| 男人和女人高潮做爰伦理| 成人亚洲精品av一区二区| 国产真实乱freesex| 日韩有码中文字幕| 欧美色视频一区免费| 精品人妻一区二区三区麻豆 | 日本 欧美在线| 丰满人妻熟妇乱又伦精品不卡| 欧美日韩黄片免| 亚洲精品色激情综合| 国产成人av教育| 日本在线视频免费播放| 婷婷精品国产亚洲av| 亚洲av.av天堂| 亚洲最大成人手机在线| 人人妻人人看人人澡| 国产三级在线视频| 成人特级av手机在线观看| 午夜精品在线福利| 日本在线视频免费播放| 国产精品一区二区性色av| 国产亚洲欧美在线一区二区| 午夜精品久久久久久毛片777| 中文字幕av在线有码专区| 亚洲中文字幕日韩| 亚洲国产欧洲综合997久久,| 国产精品嫩草影院av在线观看 | 特大巨黑吊av在线直播| 一个人看视频在线观看www免费| 色噜噜av男人的天堂激情| 色精品久久人妻99蜜桃| 老女人水多毛片| 成人国产一区最新在线观看| 舔av片在线| 日本黄色片子视频| 网址你懂的国产日韩在线| 国产私拍福利视频在线观看| 亚洲五月婷婷丁香| 看片在线看免费视频| 中文字幕av成人在线电影| 99国产综合亚洲精品| 国产精品久久久久久久久免 | 亚洲精品一区av在线观看| 国产伦人伦偷精品视频| 亚洲欧美精品综合久久99| 国产精品一区二区三区四区免费观看 | 天美传媒精品一区二区| 最新在线观看一区二区三区| 两性午夜刺激爽爽歪歪视频在线观看| 国产午夜精品久久久久久一区二区三区 | 欧美在线一区亚洲| av在线老鸭窝| 午夜福利高清视频| 国产精品爽爽va在线观看网站| 99久久精品国产亚洲精品| 婷婷亚洲欧美| 丰满人妻一区二区三区视频av| 国产精品美女特级片免费视频播放器| 午夜免费男女啪啪视频观看 | 51国产日韩欧美| 少妇熟女aⅴ在线视频| 99热只有精品国产| 国产欧美日韩一区二区精品| 国内精品久久久久精免费| av天堂在线播放| 色播亚洲综合网| 日韩欧美国产在线观看| 成人av一区二区三区在线看| 欧美性感艳星| 两人在一起打扑克的视频| 网址你懂的国产日韩在线| 精品国产三级普通话版| 久久久国产成人免费| 韩国av一区二区三区四区| 婷婷色综合大香蕉| 亚洲av第一区精品v没综合| 欧美另类亚洲清纯唯美| 内射极品少妇av片p| 丁香欧美五月| 丝袜美腿在线中文| 精品午夜福利视频在线观看一区| 激情在线观看视频在线高清| 亚洲熟妇中文字幕五十中出| 一级av片app| 国产精品1区2区在线观看.| 男女做爰动态图高潮gif福利片| 99国产精品一区二区蜜桃av| 级片在线观看| 日韩精品青青久久久久久| 毛片一级片免费看久久久久 | 在现免费观看毛片| 99热精品在线国产| 色在线成人网| 午夜老司机福利剧场| 在线国产一区二区在线| 91av网一区二区| 男人的好看免费观看在线视频| 午夜久久久久精精品| 日韩欧美 国产精品| 听说在线观看完整版免费高清| 99热这里只有精品一区| 久久香蕉精品热| 国产国拍精品亚洲av在线观看| 久久久久性生活片| 日日摸夜夜添夜夜添小说| 日韩免费av在线播放| 舔av片在线| 国产精品久久久久久久久免 | 国产黄a三级三级三级人| 亚洲人与动物交配视频| 欧美日韩国产亚洲二区| 婷婷六月久久综合丁香| 麻豆成人午夜福利视频| 老熟妇乱子伦视频在线观看| 亚洲自偷自拍三级| 能在线免费观看的黄片| 天堂av国产一区二区熟女人妻| 久久精品久久久久久噜噜老黄 | АⅤ资源中文在线天堂| 男人的好看免费观看在线视频| 搞女人的毛片| 天堂动漫精品| 成年女人毛片免费观看观看9| 一级黄色大片毛片| 久久久久久大精品| 国产精品一及| 欧美日韩福利视频一区二区| 亚洲最大成人中文| 国产欧美日韩精品亚洲av| 亚洲av电影不卡..在线观看| 两个人的视频大全免费| 国产精品精品国产色婷婷| 校园春色视频在线观看| 九九在线视频观看精品| 欧美性猛交╳xxx乱大交人| 精品久久久久久久久久久久久| 国产av在哪里看| 日本一二三区视频观看| 亚洲午夜理论影院| 精品国产三级普通话版| 三级毛片av免费| 中文亚洲av片在线观看爽| 观看美女的网站| 免费在线观看日本一区| 久久精品久久久久久噜噜老黄 | 欧美性感艳星| 亚洲在线自拍视频| 成人三级黄色视频| 成人性生交大片免费视频hd| 99久久九九国产精品国产免费| 成年女人永久免费观看视频| 国产精品永久免费网站| 国产乱人视频| 日韩欧美免费精品| 精品99又大又爽又粗少妇毛片 | 日韩欧美 国产精品| 午夜福利在线观看吧| 国产熟女xx| 国产精品免费一区二区三区在线| 国产成人aa在线观看| 精品福利观看| 久久精品国产亚洲av香蕉五月| 色视频www国产| 日韩欧美 国产精品| 色精品久久人妻99蜜桃| 国产精品不卡视频一区二区 | 欧洲精品卡2卡3卡4卡5卡区| 成人毛片a级毛片在线播放| 欧美在线一区亚洲| 国产在线精品亚洲第一网站| 日韩欧美精品v在线| 亚洲欧美日韩高清专用| 亚洲经典国产精华液单 | 亚洲午夜理论影院| 精品乱码久久久久久99久播| 很黄的视频免费| 欧美区成人在线视频| 日本免费a在线| 成人欧美大片| 国产精品久久久久久精品电影| 亚洲精品456在线播放app | 免费看a级黄色片| 亚洲精品久久国产高清桃花| 久久久久久久久久成人| 亚洲国产欧美人成| 内地一区二区视频在线| 久久久久久九九精品二区国产| 国模一区二区三区四区视频| 久久久久久久久久成人| 日本精品一区二区三区蜜桃| 欧美丝袜亚洲另类 | 国内少妇人妻偷人精品xxx网站| 老鸭窝网址在线观看| 99久久精品一区二区三区| 亚洲av免费在线观看| 亚洲第一欧美日韩一区二区三区| 一级黄色大片毛片| 我要看日韩黄色一级片| 成人欧美大片| 色吧在线观看| 一进一出抽搐动态| 变态另类成人亚洲欧美熟女| a级毛片免费高清观看在线播放| 亚洲天堂国产精品一区在线| 亚洲成人精品中文字幕电影| 在现免费观看毛片| 少妇高潮的动态图| 国产精品精品国产色婷婷| 中文字幕人妻熟人妻熟丝袜美| 精品久久久久久,| 99精品久久久久人妻精品| 亚洲专区国产一区二区| 天美传媒精品一区二区| a级一级毛片免费在线观看| 一进一出好大好爽视频| 国产成人av教育| 色哟哟哟哟哟哟| 精品久久久久久久末码| 国产成+人综合+亚洲专区| 久久久久久久午夜电影| 中文字幕人妻熟人妻熟丝袜美| 最新中文字幕久久久久| 国产色爽女视频免费观看| 床上黄色一级片| 91在线观看av| 啪啪无遮挡十八禁网站| 亚洲电影在线观看av| 日韩有码中文字幕| 美女大奶头视频| 内地一区二区视频在线| 精品午夜福利在线看| 少妇的逼水好多| 在线观看美女被高潮喷水网站 | 舔av片在线| 亚洲最大成人中文| 亚洲五月婷婷丁香| 此物有八面人人有两片| 99久国产av精品| 国产欧美日韩一区二区三| 亚洲三级黄色毛片| 深爱激情五月婷婷| 麻豆成人av在线观看| 在现免费观看毛片| 亚洲精品一区av在线观看| 成人亚洲精品av一区二区| 高清日韩中文字幕在线| 真人做人爱边吃奶动态| 两个人视频免费观看高清| 哪里可以看免费的av片| 免费av观看视频| 最近中文字幕高清免费大全6 | 久久精品人妻少妇| 亚洲第一欧美日韩一区二区三区| 国产91精品成人一区二区三区| 欧美潮喷喷水| 免费观看人在逋| 变态另类成人亚洲欧美熟女| 能在线免费观看的黄片| 亚洲精品成人久久久久久| 国内久久婷婷六月综合欲色啪| 天堂动漫精品| 欧美乱色亚洲激情| 欧美成人一区二区免费高清观看| 国内少妇人妻偷人精品xxx网站| 成人鲁丝片一二三区免费| 99久久精品热视频| 国产伦精品一区二区三区四那| 深爱激情五月婷婷| 女同久久另类99精品国产91| 国产精品美女特级片免费视频播放器| 精华霜和精华液先用哪个| 国产aⅴ精品一区二区三区波| 有码 亚洲区| 两性午夜刺激爽爽歪歪视频在线观看| 最近最新免费中文字幕在线| 国产高潮美女av| 久久精品国产99精品国产亚洲性色| 亚洲人成网站在线播放欧美日韩| 狂野欧美白嫩少妇大欣赏| 国产真实伦视频高清在线观看 | 夜夜看夜夜爽夜夜摸| 午夜激情欧美在线| 无遮挡黄片免费观看| 色综合欧美亚洲国产小说| 我的女老师完整版在线观看| 欧美高清成人免费视频www| 日韩av在线大香蕉| 悠悠久久av| 久久草成人影院| 亚洲av美国av| 好看av亚洲va欧美ⅴa在| 午夜福利在线观看吧| 在线观看av片永久免费下载| 色av中文字幕| 国产欧美日韩精品亚洲av| 欧美乱色亚洲激情| 国产亚洲精品久久久com| 婷婷精品国产亚洲av在线| 99热这里只有精品一区| 国产成人福利小说| 757午夜福利合集在线观看| 给我免费播放毛片高清在线观看| 亚洲真实伦在线观看| 亚洲不卡免费看| АⅤ资源中文在线天堂| 欧美日韩瑟瑟在线播放| 亚洲国产色片| 男人舔女人下体高潮全视频| 啦啦啦韩国在线观看视频| 精品免费久久久久久久清纯| 日本黄大片高清| 日本黄色片子视频| 精品乱码久久久久久99久播| 成人永久免费在线观看视频| 国产精华一区二区三区| 国产真实伦视频高清在线观看 | 国产精品一区二区性色av| 又爽又黄无遮挡网站| 免费电影在线观看免费观看| 在线播放无遮挡| 最后的刺客免费高清国语| 久久久久亚洲av毛片大全| 99久久成人亚洲精品观看| 亚洲av电影在线进入| 亚洲经典国产精华液单 | 国内揄拍国产精品人妻在线| 99久久精品一区二区三区| 色播亚洲综合网| 日韩中文字幕欧美一区二区| 国产精品嫩草影院av在线观看 | 啦啦啦韩国在线观看视频| 免费高清视频大片| 在线国产一区二区在线| 在线观看美女被高潮喷水网站 | 国产亚洲欧美在线一区二区| 国产伦一二天堂av在线观看| 91久久精品国产一区二区成人| 日韩中文字幕欧美一区二区| 精品一区二区三区视频在线| 欧美又色又爽又黄视频| 国产成人欧美在线观看| 久久精品久久久久久噜噜老黄 | 俺也久久电影网| 日本五十路高清| 日韩欧美国产在线观看| 免费看美女性在线毛片视频| 不卡一级毛片| 国产精品久久久久久久久免 | 国产又黄又爽又无遮挡在线| 国内毛片毛片毛片毛片毛片| 亚洲一区二区三区色噜噜| 国产v大片淫在线免费观看| 九色成人免费人妻av| 看十八女毛片水多多多| x7x7x7水蜜桃| 在线免费观看的www视频| 国产精品亚洲美女久久久| 日韩欧美精品免费久久 | 中文字幕人妻熟人妻熟丝袜美| 极品教师在线免费播放| 日本黄大片高清| 精品99又大又爽又粗少妇毛片 | 桃色一区二区三区在线观看| 97超视频在线观看视频| 日韩国内少妇激情av| 精品熟女少妇八av免费久了| 国产高清激情床上av| 中文字幕高清在线视频| 一本久久中文字幕| 婷婷色综合大香蕉| a级一级毛片免费在线观看| 国模一区二区三区四区视频| 亚洲成人精品中文字幕电影| 99热精品在线国产| 午夜福利在线观看吧| 亚洲自拍偷在线| 国产精品电影一区二区三区| 成人午夜高清在线视频| 亚洲精品在线美女| 午夜激情福利司机影院| 此物有八面人人有两片| 国产精品一及| 日本 欧美在线| 国产高潮美女av| 可以在线观看的亚洲视频| 村上凉子中文字幕在线| 亚洲成a人片在线一区二区| 一a级毛片在线观看| 国产 一区 欧美 日韩| 亚洲无线在线观看| 伦理电影大哥的女人| 欧美成狂野欧美在线观看| av在线观看视频网站免费| 中文字幕免费在线视频6| 日本精品一区二区三区蜜桃| 国产精品人妻久久久久久| 嫩草影院精品99| 国产成人aa在线观看| 国产主播在线观看一区二区| 欧美潮喷喷水| 亚洲国产精品成人综合色| 亚洲成人久久性| 亚洲精品456在线播放app | 国产高清激情床上av| 乱码一卡2卡4卡精品| 九九热线精品视视频播放| 看十八女毛片水多多多|