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Today, electric power transmission systems should face many demanding chal-
lenges, which include balancing between reliability, economics, environmental,
and other social objectives to optimize the grid assets and satisfy the growing
electrical demand.
Moreover, the operational environment of transmission systems is becoming
increasingly rigorous due to continually evolving functions of interconnected
power networks from operation jurisdiction to control responsibly – coupled with
the rising demand and expectation for reliability.
標(biāo)簽：
Monitoring
Protection
Wide
Area
上傳時(shí)間：
2020-06-07
上傳用戶：shancjb
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Sensors are points ofcontact betweenthe material world ofatoms, mass, andenergy
and the seemingly immaterial world of information, computation, and cognition.
Linking these two domains more tightly yields all sorts of practical benefits, such as
improvedinputdevicesforcomputers,moreeffectivemedicaldevices(implantedor
worn), more precise agricultural operations, better monitored buildings or bridges,
more secure payment systems, and more reliable sensor–actuator control systems.
There are many settings in which tighter coupling between digital and physical
planes can enhance safety, security, performance, and reliability.
標(biāo)簽：
Computational
RFID
上傳時(shí)間：
2020-06-08
上傳用戶：shancjb
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Radio frequency identification (RFID) is a type of automatic identification systems
which has gained popularity in recent years for being fast and reliable in keeping
track of the individual objects. In RFID systems, contactless object identification
is achieved using radio signals without the need for physical contact as the case
with other existing identification technologies such as barcodes. Therefore, a huge
number of items can be identified in a short amount of time with high reliability
and low cost which makes the RFID technology very attractive for a wide range of
applications such as supply chain management, e-health, monitoring humans, pets,
animals, and many other objects, toll control, and electrical tagging. Furthermore,
RFID technology eliminates the human error and reduces the total cost of the
products.
標(biāo)簽：
Security
RFID
上傳時(shí)間：
2020-06-08
上傳用戶：shancjb
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Extensively rewritten to present the C++11 language, standard library, and key design techniques as an integrated whole, Stroustrup thoroughly addresses changes that make C++11 feel like a whole new language, offering definitive guidance for leveraging its improvements in performance, reliability, and clarity. C++ programmers around the world recognize Bjarne Stoustrup as the go-to expert for the absolutely authoritative and exceptionally useful information they need to write outstanding C++ programs. Now, as C++11 compilers arrive and development organizations migrate to the new standard, they know exactly where to turn once more: Stoustrup's C++ Programming Language, Fourth Edition.Bjarne Stroustrup是C++的設(shè)計(jì)師和最早的實(shí)現(xiàn)者，也是《C++程序設(shè)計(jì)語(yǔ)言》、《帶標(biāo)注的C++參考手冊(cè)》和《C++語(yǔ)言的設(shè)計(jì)與演化》的作者。他從丹麥Aarhus大學(xué)和英國(guó)牛津大學(xué)畢業(yè)，現(xiàn)在是AT&T大規(guī)模程序設(shè)計(jì)研究部的負(fù)責(zé)人，AT&T特別成員，AT&T貝爾實(shí)驗(yàn)室特別成員，以及ACM特別成員。Stroustrup的研究興趣包括分布式系統(tǒng)、操作系統(tǒng)、模擬、設(shè)計(jì)和程序設(shè)計(jì)。他也是Addison·Wesley的C++In-Depth系列書籍的編輯。
標(biāo)簽：
C++
上傳時(shí)間：
2022-02-01
上傳用戶：
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The PW8205A8TS is the highest performance trench N-ch MOSFETs with extreme high cell density,which provide excellent RDSON and gate charge for most of the small power switching and loadswitch applications. The meet the RoHS and Product requirement with full function reliabilityapproved .
標(biāo)簽：
8205a8
上傳時(shí)間：
2022-02-14
上傳用戶：wangshoupeng199
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超聲波測(cè)距在智能機(jī)器人中的開發(fā)與應(yīng)用摘 要：本文提出了在機(jī)器人控制中，使用軟件方法實(shí)現(xiàn)超聲波測(cè)距機(jī)器人避障功能的工作原理和設(shè)計(jì)
方法。該系統(tǒng)在使用過(guò)程中，測(cè)量精度高，機(jī)器人避障準(zhǔn)確，可靠，真正實(shí)現(xiàn)了智能化控制。
關(guān)鍵詞：機(jī)器人 超聲波 測(cè)距 軟件觸發(fā)
Abstract： The 0n pnnc eanddesignm d10d ofu]U~ sordc are descx'~edindetail fora intenigencero~ ic
． ByI|8i“gthissystem，therobotmakesaccta~elyavoidingdmwhackhi# reliability．
1畸 wo阿s：ro tultro-sor~c聊 曲 喀sot~aretrigger
1 引言
在智能機(jī)器人的研制開發(fā)中，很重要 的一部
分就是機(jī)器人 要能實(shí)現(xiàn)避 障功能 ，即通過(guò)傳感器
的作用 ，探測(cè)機(jī)器人行進(jìn)道路 上是否碰到障礙。
若碰到了障礙 ，機(jī)器人應(yīng)該 自動(dòng)轉(zhuǎn)向 ，躲避障礙 。
本文所介 紹的超聲 波測(cè)距方法 ，應(yīng)用 于 ET一18
Hem智能機(jī)器人中。通過(guò)超聲波測(cè)距 ，該智能機(jī)
器人實(shí)現(xiàn)了對(duì)步進(jìn)電動(dòng)機(jī)的智能控制及運(yùn)動(dòng)控制
方式的靈活應(yīng)用。同時(shí)，超聲波測(cè)距作為一種非
接觸 的檢測(cè)方式 ，和紅外 、激光及無(wú)線電測(cè)距相
比，在近距范 圍內(nèi)有不受光線影響、結(jié)構(gòu)簡(jiǎn)單 、成
本低等優(yōu)點(diǎn)
2 超聲波測(cè)距基本原理
超聲波是指頻率在 2000Hz以上 ，不能引起正
常人聽覺反應(yīng) 的機(jī)械振動(dòng)波 ，是物體 的機(jī)械振 動(dòng)
在彈性介質(zhì) 中傳播所形成 的機(jī)械振動(dòng)波。由于超
聲波具有非常短 的波長(zhǎng) ，可 以聚集成狹小 的發(fā)
標(biāo)簽：
超聲波測(cè)距
智能機(jī)器人
上傳時(shí)間：
2022-02-16
上傳用戶：jiabin
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以AT89S52單片機(jī)為控制核心,采用電容降壓技術(shù),Buck電路拓?fù)?PWM驅(qū)動(dòng)模塊和功率器件散熱設(shè)計(jì),通過(guò)高速的數(shù)據(jù)采集、主功率輸入輸出模塊和控制模塊,設(shè)計(jì)一種新型智能車載充電器.在充電過(guò)程中,通過(guò)負(fù)脈沖瞬間放電實(shí)現(xiàn)對(duì)鉛酸蓄電池的再生修復(fù),提高電池的有效容量,延長(zhǎng)使用壽命.該充電器體積小、速度快、效率高、可靠性好.With AT89S52 single chip computer as the control core,a new type of intelligent car-carried charger was designed by using capacitance step-down technology,Buck circuit topology,PWM driving module and power device heat dissipation design,through high-speed data acquisition,main power input and output module and control module.In the charging process,the regeneration and repair of lead-acid batteries are realized by instantaneous discharge of negative pulse,which improves the effective capacity of batteries and prolongs their service life.The charger has the advantages of small size,fast speed,high efficiency and good reliability.
標(biāo)簽：
車載充電器
上傳時(shí)間：
2022-03-27
上傳用戶：
-
CAN總線是汽車上應(yīng)用最廣泛的車載網(wǎng)絡(luò)總線,具有實(shí)時(shí)性強(qiáng)、可靠性高、成本低等優(yōu)點(diǎn)。鑒于此,介紹了一種利用飛思卡爾系列單片機(jī)MC9S12XS128作為控制器,利用其內(nèi)部的MSCAN模塊、CAN收發(fā)器TJA1040等外圍元件進(jìn)行CAN總線通信節(jié)點(diǎn)設(shè)計(jì)。該設(shè)計(jì)能夠?qū)崿F(xiàn)CAN總線數(shù)據(jù)的發(fā)送與接收,可應(yīng)用于汽車及其他各種CAN總線通信系統(tǒng)。CAN bus is the most widely used on-board network bus in automobiles. It has the advantages of realtime, high reliability and low cost. In view of this,this paper introduces the design of CAN bus communication node by using Freescale MC9S12XS128 as controller,using its internal MSCAN module,CAN transceiver TJA1040 and other peripheral components. This design can realize the sending and receiving of CAN bus data,and can be used in automobile and other CAN bus communication systems.
標(biāo)簽：
單片機(jī)
can總線
通信
上傳時(shí)間：
2022-03-27
上傳用戶：
-
本文首次設(shè)計(jì)并驗(yàn)證了基于macom三合一芯片設(shè)計(jì)的光模塊電路,該電路旨在提供一種滿足SFF-8472中規(guī)定的數(shù)字診斷功能的低成本SFP+模塊。電路采用激光器驅(qū)動(dòng)、限幅放大器、控制器以及時(shí)鐘恢復(fù)單元集成的單芯片,在保證高精度數(shù)字診斷功能基礎(chǔ)上,實(shí)現(xiàn)了低成本高可靠的特點(diǎn)。該電路在光接收接口組件與激光器驅(qū)動(dòng)和限幅放大器單元的限幅放大器部分之間接入濾波器來(lái)提高模塊的靈敏度及信號(hào)質(zhì)量。在控制器單元的數(shù)字電位器的引腳上采用外加電阻的方式避免出現(xiàn)上電不發(fā)光的故障問(wèn)題。該研究結(jié)果為下一代SFP-DD光模塊設(shè)計(jì)與開發(fā)工作,奠定了一定的理論與實(shí)踐基礎(chǔ)。This paper designs and validates the optical module circuit based on the MACOM Trinity chip for the first time.This circuit aims to provide a low-cost SFP module which meets the digital diagnosis function specified in SFF-8472.The circuit uses a single chip integrated with laser driver,limiting amplifier,controller and clock recovery unit.On the basis of ensuring high precision digital diagnosis function,it achieves the characteristics of low cost and high reliability.The circuit connects a filter between the optical receiving interface module and the limiting amplifier part of the laser driver and limiting amplifier unit to improve the sensitivity and signal quality of the module.The pin of the digital potentiometer in the controller unit is equipped with an external resistance to avoid the problem of power failure.The research results lay a theoretical and practical foundation for optical module design in high-speed data center.
標(biāo)簽：
sfp
光收發(fā)模塊
上傳時(shí)間：
2022-04-03
上傳用戶：
-
針對(duì)交流電路過(guò)零檢測(cè)電路存在結(jié)構(gòu)復(fù)雜、過(guò)零點(diǎn)檢測(cè)不準(zhǔn)確、編程繁瑣等問(wèn)題，設(shè)計(jì)了一種基于LM339的硬件結(jié)構(gòu)簡(jiǎn)單的過(guò)零檢測(cè)電路。通過(guò)仿真軟件Mulisim對(duì)該設(shè)計(jì)電路進(jìn)行了仿真，實(shí)驗(yàn)證明了該方案過(guò)零檢測(cè)的可行性、穩(wěn)定性和可靠性，可直接作為交流電路中CPU的過(guò)零信號(hào)。Aiming at the problems of AC cilsuit zero crossing detection circuit such as complex structure, zero crossing detection and cumbersome programming, a zero crossing detection circuit with simple hardware structure based on LM339 was designed. The design circuit was simulated by simulation software Mulisim, and the feasibility, stability and reliability of zero crossing detection were proved by experiments, which can be used as zero crossing signal of CPU in AC circuit directly.
標(biāo)簽：
lm339
電壓比較器
上傳時(shí)間：
2022-05-03
上傳用戶：
