This paper presents a new type of electromagnetic damper with rotating inertial mass that has been devel oped to control the vibrations of structures subjected to earthquakes. The electromagnetic inertial mass damper (EIMD) consists of a ball screw that converts axial oscillation of the rod end into rotational motion of the internal flflywheel and an electric generator that is turned by the rotation of the inner rod. The EIMD is able to generate a large inertial force created by the rotating flflywheel and a variable damping force devel oped by the electric generator. Device performance tests of reduced-scale and full-scale EIMDs were under taken to verify the basic characteristics of the damper and the validity of the derived theoretical formulae. Shaking table tests of a three-story structure with EIMDs and earthquake response analyses of a building with EIMDs were conducted to demonstrate the seismic response control performance of the EIMD. The EIMD is able to reduce story drifts as well as accelerations and surpasses conventional types of dampers in reducing acceleration responses.
標簽： electromagnetic response Seismic control using
上傳時間： 2021-11-04
上傳用戶：a1293065
It all started rather innocuously. I walked into Dr GT Murthy’s office one fine day, andchanged my life. “Doc” was then the General Manager, Central R&D, of a very largeelectrical company headquartered in Bombay. In his new state-of-the-art electronics center,he had hand-picked some of India’s best engineers (over a hundred already) ever assembledunder one roof. Luckily, he too was originally a Physicist, and that certainly helped me gainsome empathy. Nowadays he is in retirement, but I will always remember him as athoroughly fair, honest and facts-oriented person, who led by example. There were severalthings I absorbed from him that are very much part of my basic engineering persona today.You can certainly look upon this book as an extension of what Doc started many years agoin India … because that’s what it really is! I certainly wouldn’t be here today if I hadn’t metDoc. And in fact, several of the brash, high-flying managers I’ve met in recent years,desperately need some sort of crash course in technology and human values from Doc!
標簽： 開關電源
上傳時間： 2021-11-23
上傳用戶：
本書是 Marc Thompson 博士 20 年模擬電路設計和教學經驗的總結，講述了模擬電路與系統設計中常用的直觀分析方法。本書提出了“模擬電路直觀方法學”，力圖幫助學生和設計人員擺脫復雜的理論推導與計算，充分利用直觀知識來應對模擬電路工程設計挑戰。全書共分為 16 章，內容涵蓋了二極管、晶體管、放大器、濾波器、反饋系統等模擬電路的基本知識與設計方法。本書大綱第 1 章與第 2 章為介紹性材料。第 1 章是本書的引言，同時介紹了模擬電路設計的發展動機，其中引用了一些精選的歷史事件。第 2 章講述后續章節中用到地重要的信號處理概念，以使讀者們能夠跟上作者的思路。第 3 章至第 8 章講述雙極性器件的物理學原理、雙極性結型晶體管 (bipolar junction transistor, BJT) 、晶體管放大器，以及用于帶寬估計與開關速度分析的近似技術。第 9 章講述 CMOS 管和 CMOS 管放大器的基礎知識。前面章節介紹的用于放大器設計的帶寬估計技術也同樣適用于 CMOS 管器件。第 10 章講述 晶體管的開關效應。晶體管是如何實現導通和關閉呢？又如何估計它的開關速度呢？第 11 章回顧反饋系統 (feedback system) 的基本知識以及設計穩定反饋系統的伯德圖 / 相位裕度方法 (Bod plot / phase margin) 。第 12 章和第 13 章講述實際運算放大器的設計、使用和限制，包括電壓反饋 (voltage-feedback) 以及電流反饋 (current-feedback) 放大器。第 14 章講述模擬低通濾波器設計的基本知識，包括巴特沃思 (Butterworth) 、切比雪夫 (Chebyshev) 、橢圓 (elliptic) 以及貝塞爾 (Bessel) 濾波器的無源梯形實現和胡源實現。第 15 章講述實際電路設計問題，比如 PCB 版圖設計規則、無源器件的使用和限制等。第 16 章是一些有用的設計技術和設計技巧的大雜燴，這些內容又不適合放在其他章節，所以作為獨立的章節進行講述。一些說明性的分析問題以及 MATLAB 和 SPICE 設計示例點綴在全書的字里行間，以幫助讀者理解本書的內容。
標簽： 模擬電路
上傳時間： 2022-02-14
上傳用戶：
首先下載軟件，解壓軟件，安裝在程序中找到SEGGER,選里面的J-FLASH，進入界面，剛開始的那個界面可以忽略，不用建project也可以；單擊菜單欄的“Options---Project settings”打開設置，進行jlink配置;正在General選項，選擇“USB”，一般都是默認配置，確認一下即可;然后在CPU選項，選擇芯片型號，先選擇“Device”才能選擇芯片型號，芯片型號，要根據你使用的芯片進行選擇;在Target interface選項 里面選擇SWD模式;首先Target里面選“Connection”連接目標芯片，然后 Target--Auto進行程序燒寫;首先Target里面選擇“Connection”連接目標芯片，然后 Target--Auto進行程序燒寫.SEGGER J-Links are the most widely used line of debug probes available today. They've proven their value for more than 10 years in embedded development. This popularity stems from the unparalleled performance, extensive feature set, large number of supported CPUs, and compatibility with all popular development environments.
標簽： JLINK
上傳時間： 2022-03-22
上傳用戶：
本文設計了一種磁致伸縮位移傳感器,介紹了該磁致伸縮位移傳感器的測量原理,通過結構優化設計提高了儀器的性能,詳述了硬件電路設計及實現方法,完成了軟件設計,實現了高壓充電、問詢脈沖加載、時間測量及濾波等功能,并通過實驗對其性能進行了驗證。所研制的磁致伸縮位移傳感器具有測量精度高、長期穩定性好等特點,滿足了大量程、高精度、惡劣環境等測量的要求。A kind of sensor based on magnetostrictive principle is designed.The measuring principle of the magnetostrictive displacement sensor is introduced,the performance of the instrument is improved by the structural optimization design,and introduced the hardware circuit design and the realization method,completed the software design,realized the functions of the high voltage charging,inquiries pulse loading,time measurement and filtering,and its performance is verified through the experiment.The magnetostrictive displacement sensor has the characteristics of high measuring precision.The sensor meets the requirements of large range,high precision,poor environment and so on.
標簽： 位移傳感器
上傳時間： 2022-04-06
上傳用戶：
說明： 8051單片機12864大液晶屏proteus仿真+源碼+keil完整工程。(8051 12864 Proteus large LCD screen simulation source keil complete the project.)
上傳時間： 2022-05-27
上傳用戶：
The following table covers the main features offered by the MT7628KN and MT7628AN. Overall, the MT7628KN supports the requirements of an entry level AP/router, while the more advanced MT7628AN supports a number of interfaces together with a large maximum RAM capacity.Features· Embedded MIPS24KEc (575/580 MHz) with 64KBl-Cache and 32KB D-Cache·2T2R 2.4GHz with 300 Mbps PHY data rate· Legacy 802.11b/g and HT 802.11n modes·20/40 MHz channel bandwidth· Reverse Data Grant(RDG)· Maximal Ratio Combining(MRC)· Space Time Block Coding(STBC)· MCM 8 Mbytes DDR1 KGD(MT7628KN)·16-bit DDR1/2 up to 128/256 Mbytes(MT7628AN/KN)· SPI/SD-XC/eMMC·x1 USB 2.0 Host,x1 Ple Root Complex·5-port 10/100 FE PHY
標簽： mt7628
上傳時間： 2022-07-25
上傳用戶：
