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- aaa_001001 2016-12-01 21:25:02
- 前面介紹了，增量編碼器碼盤是由很多光柵刻線組成的，有兩個（或4個，以后討論4個光眼的）光眼讀取A，B信號的，刻線的密度決定了這個增量型編碼器的分辨率，也就是可以分辨讀取的Z小變化角度值。代表增量編碼器的分辨率的參數(shù)是PPR，也就是每轉脈沖數(shù)，例如每圈刻線360線，A，B每圈各輸出360個脈沖，分辨率參數(shù)就是360PPR。那么這個編碼器可分辨的Z小角度變化量是多少度呢？就是1度嗎？ 增量編碼器的A/B輸出的波形一般有兩種，一種是有陡直上升沿和陡直下降沿的方波信號，一種是緩慢上升與下降，波形類似正弦曲線的Sin/Cos曲線波形信號輸出，A與B相差1/4T周期90度相位，如果A是類正弦Sin曲線，那B就是類余弦Cos曲線。 對于方波信號，A，B兩相相差90度相（1/4T），這樣，在0度相位角，90度，180度，270度相位角，這四個位置有上升沿和下降沿，這樣，實際上在1/4T方波周期就可以有角度變化的判斷，這樣1/4的T周期就是Z小測量步距，通過電路對于這些上升沿與下降沿的判斷，可以4倍于PPR讀取角度的變化，這就是方波的四倍頻。這種判斷，也可以用邏輯來做，0代表低，1代表高，A/B兩相在一個周期內變化是0 0，0 1，1 1，1 0 。這種判斷不僅可以4倍頻，還可以判斷旋轉方向。 那么，方波信號的Z小分辨角度=360度/(4xPPR)
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- 編碼器AB兩相2500ppr怎么變成10000 ppr？希望得到計算過程 萬分感謝。
2016-12-01 08:21:04
460
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- 幫忙翻譯一下，萬分感謝
- 說明一下860DSP是一個信號測量儀器的型號 Here is a good explanation of how the 860 in spectrum mode uses the different settings like dwell wide， narrow， and averaging to look at the spectrum data differently. 860 DSPI Spectrum Analyzer Set... 說明一下860DSP是一個信號測量儀器的型號 Here is a good explanation of how the 860 in spectrum mode uses the different settings like dwell wide， narrow， and averaging to look at the spectrum data differently. 860 DSPI Spectrum Analyzer Settings Explanation In the 860 DSPI there are 3 different and unique spectrum analyzer “Detectors”. These detectors may alter the view of a signals appearance， depending on which is selected. Each detector can show a different picture on the same signal because of the way the detector functions. An important selection to our spectrum analyzer is the amount of digital snap shots to be taken. This will be the amount of digital snapshots that is taken in the allocated bandwidth before showing a picture. With this said， the more sampling that is put into the spectrum analyzer the slower it will seem to update， but more opportunity to capture ingress and other interference that can happen inside a cable plant. Dwell Wide- Dwell Wide takes the largest snapshot out of the amount taken， then the 7.5 MHz spectrum is peak held as the 860 DSPI tunes across the selected frequencies in 250 kHz steps. Example: In Dwell Wide， with a 32 sampling rate set， this in turn means the 860 will dwell or sit on a portion of the spectrum defined above， take 32 snap shots， and then display the picture with the max amplitude before moving on to the next portion of bandwidth. Dwell Narrow- Dwell Narrow takes the largest snapshot out of the amount taken， then a 250 kHz spectrum slice is peak held as the 860 DSPI tunes across the selected frequencies in 250 kHz steps. The difference between Dwell Narrow and Dwell Wide is that Dwell Narrow only peak holds across a 250 kHz slice， where as Dwell wide peak holds the entire 7.5 MHz. Example: In Dwell Narrow， with a 32 sampling rate set， this in turn means the 860 will go to the first 7.5 MHz of the spectrum it will look at a 250 kHz slice of the 7.5 MHz and take its 32 samples. These 32 samples will be done in a peak hold fashion， then display the sample that contains the largest signal. Averaging: This detector when selected looks at a 7.5 MHz portion of the spectrum. When it tunes to the first 7.5 MHz portion of the spectrum， it takes into account how much sampling is selected， then takes it’s digital snapshots on the entire 7.5 MHz， averages those pictures together， then shows the final averaged picture. This detector is used for looking at large amounts of bandwidth. Example: In Averaging， with a 32 sampling rate set， this in turn means the 860 will go to the first 7.5 MHz of the spectrum， take it’s 32 digital snap shots， average those together， and show the average of the 32 snapshots. 展開
2010-12-10 08:46:08
551
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- 如何使用Matlab，對一組數(shù)據進行FFT變換，得到頻譜分析，萬分感謝。
- 數(shù)據分別是電流和電壓
2012-03-17 01:33:14
411
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- 什么是編碼器PPR
2012-03-14 11:31:52
408
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- 跪求，英語翻譯，萬分感謝?。?！急急急！??！
- In this study， active reforming catalysts for use of gasification of biomass compounds in aqueous medium were developed by depo-sition of platinum on various supports (activated carbon， titanium dioxide， alumina， single-walled and multi-wal... In this study， active reforming catalysts for use of gasification of biomass compounds in aqueous medium were developed by depo-sition of platinum on various supports (activated carbon， titanium dioxide， alumina， single-walled and multi-walled carbon nano-tubes， graphene oxide and tungsten oxide-zirconium oxide) using nanotechnological approaches in supercritical carbon dioxide media. The effects of supports and platinum reduction methods have been investigated to optimize the catalytic activity of sup-ported platinum catalyst for hydrogen-rich gas production by aqueous-phase reforming of wheat straw biomass hydrolysates and glucose solution. 展開
2013-04-23 12:18:38
293
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- 幫忙翻譯下 十萬火急!!!! 萬分感謝！!!!!!!!!!
- thequalitysystemofthecompanyisinconformitywithISO9002.markingcomprehensiveuseofbiotechnology，finechemicaltechnology，thecompanyspecializesinmanufacturingandsellingC-4serie... the quality system of the company is in conformity with ISO 9002 . marking comprehensive use of biotechnology，fine chemical technology，the company specializes in manufacturing and selling C-4 series organic acids and chiral products. these products are widely used in many field such as food， pharmaceutical and chemical industries， and are well accepted by the domestic and overseas market. the main products are L-Malic acid ，DL- Malic acid，L(+)-lartaric acid， fumaric acid， Maleic acid and other organic acids. annual productivity amounts to 20，000 tones. the company has become aninportant manufacturer of C-4 series organic acids in the world. all the products of the company have respectively met the different international advanced standards such as food chemicals codex U.S. pharmacopoeia ， british pharmacopoeia ，and the products have obtained Star-K Kosher Certificate. Above 70% of the company 's products are exported to Japan，Europe，Australia，the United States and Middle East， and they are renown and well recognized in the international markets. the company will devote itself to research and development of enzyme technology and organic electrochemistry. it will continuously introduce new food additives， chiral pharmaceutical intermediates，chiral auxiliaries and chiral drugs. depending on superior quality ， good service and high reputation ， the company is willing to establish a long -term mutually beneficial business partnership with overseas customers and continue to contribute to the happy life of humans. 展開
2011-03-30 01:24:33
558
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- 編碼器分辨率有10000的嗎？
2017-12-15 15:12:45
447
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- 求翻譯，哪位好心人，幫幫忙！萬分感謝
- This work was supported by Science Foundation Ireland (PIYRA 07/YI2/I1052). The authors acknowledge the European Commission under framework 7 (PERG-GA-2009-249178)， IRCSET and Intel (postdoctoral fellowship to IK and post-graduate scholarsh... This work was supported by Science Foundation Ireland (PIYRA 07/YI2/I1052). The authors acknowledge the European Commission under framework 7 (PERG-GA-2009-249178)， IRCSET and Intel (postdoctoral fellowship to IK and post-graduate scholarship to EDC) for support. We thank Dr Tatiana Perova for granting access to Micro-Raman spectrometer， Dr Daniel Heller (MIT) for fruitful discussions， Dania Movia for technical support. 展開
2013-05-03 02:56:42
528
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- 高分！計算機、嵌入式高手進，萬分感謝！！
- cpu真正處理一個進程的時間，比如我們的cpu，當一個.exe程序需要處理時，不是一直占用cpu吧，我原來聽老師說真正占用cpu時間只有很少的一段。但是持續(xù)一直運行，不占cpu如何繼續(xù)下去，是不是內存？ 問題1： 打開一個realplay播放器看一部電影，是不是從開始一... cpu真正處理一個進程的時間，比如我們的cpu，當一個.exe程序需要處理時，不是一直占用cpu吧，我原來聽老師說真正占用cpu時間只有很少的一段。但是持續(xù)一直運行，不占cpu如何繼續(xù)下去，是不是內存？ 問題1： 打開一個realplay播放器看一部電影，是不是從開始一直到結束1個多小時一直占用cpu？我覺得占cpu只有很少的一段時間。大俠可否詳細給小弟說明下，謝謝啊! 問題2：是在S3C2410平臺上可以同時打開多少個madplay播放器運行？ 問題3：ARM9的指令周期大約是7.6ns（內核時鐘為120MHz時），是不是看一個程序的執(zhí)行要多少條指令，那么這個程序就占用多長時間的CPU？ 我寫論文對這些很困惑，要是大寫可以很好地解決我的問題，我可以再加200分！拜謝??！ 展開
2010-05-09 05:58:25
343
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- 急?。。≌l能幫我翻譯一下？萬分感謝！
- Definitions: APQP ASDE BOM EPR ESWP Advanced Product Quality Planning Advanced Supplier Development Engineer Bill of Material Early Program Review Early Sourcing Work Plan. A report including Commodity Classification (Metals，... Definitions: APQP ASDE BOM EPR ESWP Advanced Product Quality Planning Advanced Supplier Development Engineer Bill of Material Early Program Review Early Sourcing Work Plan. A report including Commodity Classification (Metals， Non- Metals， Electrical/electronics)， source-required dates， cost targets， and production tooling kick-off required dates for all purchased components. The document representing the European ESWP is On Track， the NA is PPTM. Procedure # VP-014 LRR On Track PPAP PPTM PSW RPC SDE SOP SPE VPDS vTPS Procedure: Launch Readiness Review European version of the Early Sourcing Work Plan (ESWP) Production Part Approval Process Purchased Parts Tracking Matrix (ESWP/PPTM): The North American version of the ESWP. The ESWP/PPTM is an Access Database maintained by NA Program Purchasing (vTPS) to capture all Forward Model Purchase Component information. Part Submission Warrant Regional Program Coordinator is a function within SPE in Europe and South America. Supplier Development Engineer Start Of Production (sometimes referred to as Job 1) Supplier Performance Engineer (combined ASD and SD Engineer) Visteon Product Development System ， PD/Program Management Gateway process used to manage the successful launch of new model programs. The North American data storage system which holds all PPTM/ESWP data. vTPS is an Access Database Responsibility: Process Map/Flowchart (1) Lead: RPC/SPE (EU & SA) (1) Lead – ASDE (NA & Asia) Conduct High Impact Assessment assign ASD / SP engineer on formal W/support from: Program sourcing and / or change of BOM. Buyer PD Engineer Program Manager – All Regions (2) Notes/Deliverables (1) Inputs: ? ESWP or local equivalent from VP-040 Project Supply Management Outputs: ? High Impact Assessment Form (VF-014a or local equivalent) Notes: ? Conduct High Impact Assessment and record results per local work instructions (2) Lead: RPC/SPE (EU & SA) Lead – ASDE (NA & Asia) W/support from: Program Buyer - All Regions， Buyer - All Regions (3) Lead: Program Buyer (NA & EU & Asia) Lead: RPC/SPE (SA) (4) No No (2) Is the part High Impact? (3) Can Supplier achieve PSW Timing? Yes Go to Step # 5. Yes Go to Step # 8. (3) Notes: ? Record PPAP status on local tracking system. (4) Hard Copies of This Document are Uncontrolled Page 2 of 4 (4) Acceptable risk to Yes 展開
2008-07-24 01:42:57
635
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- AB伺服電機編碼器如何更換
- 現(xiàn)有AB伺服電機：1326AB-B720E-M2K7L用的是SIKE的編碼器，損壞后我用同一型號的編碼器更換為什么不能用，還需要怎樣處理？ 補充：更換后控制器顯示“E20”，即編碼器故障
2011-05-20 23:31:03
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- 篩網印花的篩網怎么制作，步驟詳細一下 萬分感謝
2015-08-08 02:13:04
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- 求專家系統(tǒng)解讀 橡膠幾個名詞 萬分感謝！
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2013-09-05 02:29:15
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- 求日語 日文翻譯幫忙翻譯一下。。。萬分感謝
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2014-03-16 13:43:20
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2018-11-30 20:22:33
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