Chatter

Xem 1-20 trên 20 kết quả Chatter
  • Bài báo này mô tả việc thiết kế bộ điều khiển trượt cho hành trình tay máy robot hai bậc tự do. Bằng cách thay hàm signum bằng hàm khuếch đại-tích phân (PI) bảo hòa, ta có thể khử chattering cho các tín hiệu điều khiển mà không gây ra sự sai lệch trong hoạt động của hệ thống.

    pdf7p phalinh16 17-08-2011 51 21   Download

  • Thưa các bạn, xin thay mặt trung tâm Anh ngữ LESH, LESH xin chân thành cảm ơn các bạn chatters, học viên cũ và mới đã quan tâm và đặt nhiều niềm tin ở LESH trong thời gian qua. Qua đó các bạn đã tham gia nhiều hoạt động : dậy tiếng Việt nói tiếng Anh, ăn trưa với người Mỹ, học thái cực quyền, salsa với giảng viên bản ngữ tại LESH, và đặc biệt lớp học giao tiếp toàn diện tiền toefl,toeic 50-100% bản ngữ tại LESH....

    pdf10p hongnhung_8 28-03-2011 74 19   Download

  • 4 Machine Tool Dynamics and Vibrations 4.1 4.2 4.3 Introduction Mechanical Structure • Drives • Controls Chatter Vibrations in Cutting Stability of Regenerative Chatter Vibrations in Orthogonal Cutting Yusuf Altintas The University of British Columbia Analytical Prediction of Chatter Vibrations in Milling Dynamic Milling Model • Chatter Stability Lobes 4.1 Introduction The accuracy of a machined part depends on the precision motion delivered by a machine tool under static, dynamic, and thermal loads.

    pdf13p medinova 28-10-2010 63 16   Download

  • 5 Machine Tool Monitoring and Control 5.1 5.2 5.3 Kourosh Danai University of Massachusetts, Amherst Introduction Process Monitoring Tool Wear Estimation • Tool Breakage Detection • Chatter Detection Process Control Control for Process Regulation • Control for Process Optimization 5.4 Conclusion 5.1 Introduction Machine tool monitoring and control are essential for automated manufacturing. Monitoring is necessary for detection of a process anomaly to prevent machine damage by stopping the process, or to remove the anomaly by adjusting the process inputs (feeds and speeds).

    pdf10p medinova 28-10-2010 57 16   Download

  • Bài báo này trình bày các nghiên cứu lý thuyết, mô phỏng và thực nghiệm của bộ điều khiển trượt mới cho hoạt động bền vững của tay máy robot bằng cách thay hàm chuyển mạch signum bằng hàm chuyển mạch tích phân-bão hòa (sat-PI) nhằm giảm hiện tượng chattering và nâng cao chất lượng điều khiển.

    pdf8p phalinh16 17-08-2011 49 16   Download

  • 6 Process Monitoring and Control of Machining Operations 6.1 6.2 6.3 Robert G. Landers University of Missouri at Rolla Introduction Force/Torque/Power Generation Cutting Force Models • Force/Torque/Power Monitoring • Force/Torque/Power Control Forced Vibrations and Regenerative Chatter Regenerative Chatter Detection • Regenerative Chatter Suppression 6.4 6.5 6.6 Tool Condition Monitoring and Control Tool Failure • Tool Wear A. Galip Ulsoy University of Michigan Other Process Phenomena Burr Formation • Chip Formation • Cutting Temperature Generation Richard J.

    pdf19p medinova 28-10-2010 56 15   Download

  • Điều khiển trượt là một phương pháp điều khiển phi tuyến đơn giản hiệu quả. Để thiết kế thành phần điều khiển trượt cần phải biết rõ các thông số của mô hình đối tượng cũng nhưcác chặn trên của các thành phần bất định của mô hình. Điều khiển trượt có dạng hàm dấu và có hiện tượng chattering các trạng thái xung quanh mặt trượt.

    pdf27p ten_12 07-02-2014 37 15   Download

  • Machine tool monitoring and control are essential for automated manufacturing. Monitoring is necessary for detection of a process anomaly to prevent machine damage by stopping the process, or to remove the anomaly by adjusting the process inputs (feeds and speeds). A process anomaly may be gradual such as tool/wheel wear, may be abrupt such as tool breakage, or preventable such as excessive vibration/chatter

    pdf10p phuphong 10-12-2009 63 11   Download

  • Những thủ thuật Yahoo! Messenger (II) Thay đổi tiêu đề của Yahoo! Messenger, tích hợp thêm các tiện ích, và tăng tốc độ Yahoo! Messenger là những "chiêu" mới mà chúng tôi sẽ giới thiệu để giúp bạn trở thành một chatter chuyên nghiệp. Thay đổi tiêu đề của Yahoo! Messenger: Thông thường, trên thanh tiêu đề ở cửa sổ của Y!M sẽ mang dòng chữ Yahoo! Messenger.

    pdf8p davidvilla2425 03-04-2011 47 9   Download

  • Using Force.com, you can build enterprise applications with world-class value, scalability, and reliability-and do it in days or weeks, not months or years. In this book, top Force.com developer Jason Ouellette offers all the technical guidance and sample code you’ll need to get outstanding results with the newest version of Force.com. Drawing on his experience building three of the world’s top ten Force.com applications, Jason Ouellette walks you through the entire project lifecycle, from identifying potential applications to prototyping, coding, and deployment.

    pdf494p caucaphung 04-02-2013 34 4   Download

  • urs is essentially a tragic age, so we refuse to take it tragically. The cataclysm has happened, we are among the ruins, we start to build up new little habitats, to have new little hopes. It is rather hard work: there is now no smooth road into the future: but we go round, or scramble over the obstacles. We’ve got to live, no matter how many skies have fallen. This was more or less Constance Chatterley’s position. The war had brought the roof down over her head. And she had realized that one must live and learn. She married...

    pdf447p subtraction1122 28-04-2013 20 4   Download

  • This is my first in a continuing series of books. "Dragons" uses a step-by-step format to walk you through making embellished polymer clay dragons for focal beads, pins, sculptures and more, with my usual chatter and suggestions along the way(plus some other fun stuff.) This is 48 pages, full color, softback.

    pdf42p bisu_5 07-05-2013 14 4   Download

  • Do People "Like" You? How Social Signals Affect Selling Insurance Now By: Jason Hornung – President Jason Hornung Agency, Inc. I spend quite a bit of time perusing sites like Producer's Web to see what topics are trending among my peers so that I can be timely with the information I provide. One of the most prevalent items I see is from guys and gals that want to figure out how to use social media to start selling insurance. The vast majority of chatter centers around different strategies that an agent can use on Facebook, Twitter and Linked In to drive...

    pdf4p khangoc2395 27-08-2012 19 3   Download

  • Bài báo này giới thiệu một bộ điều khiển trượt thích nghi dùng mạng nơ rôn với luật cập nhật đơn giản, nhằm giải quyết bài toán chattering. Phương pháp điều khiển đề nghị không đòi hỏi phải nhận dạng trực tuyến các hàm phi tuyến trong mô hình của đối tượng. Mời các bạn cùng tham khảo.

    pdf5p kiepnaybinhyen_00 26-11-2015 7 3   Download

  • Intelligent Centerless Grinding: Global Solution for Process Instabilities and Optimal Cycle Design I. Gallego (3) Manufacturing Department, Faculty of Engineering – Mondragon University, Mondragon, Spain Submitted by R. Bueno (1), San Sebastian, Spain Abstract Centerless grinding productivity is largely limited by three types of instabilities: chatter, geometric lobing and workpiece rotation problems.

    pdf6p xuanphuongdhts 21-12-2012 22 2   Download

  • Operations in the intermediate stage segregate some elements and group others, forming coherent representations. In late visual process- ing stages certain regions of the object are selected for further scrutiny, memories are activated, objects are recognized and associated with meanings. In the case of visual stimuli found to be aesthetically pleasing, these operations elicit emo- tional processes, which feedback into the system via attentional mechanisms.

    pdf8p giamdocamnhac 06-04-2013 14 2   Download

  • Department of Mechanical Engineering, Faculty of Mining Engineering, University of the Basque Country, Colina de Beurko s/n 48902 Barakaldo, Spain b Department of Mechanical Engineering, Faculty of Engineering, University of the Basque Country, Alameda de Urquijo s/n 48013 Bilbao, Spain Received 20 August 2007; received in revised form 29 November 2007; accepted 4 December 2007 Available online 15 December 2007 Abstract Centerless grinding operations present some characteristic features that make the process especially susceptible to regenerative chatter instabilities.

    pdf9p xuanphuongdhts 21-12-2012 20 1   Download

  • "Stand to, you rocket wash!" A harsh, bull-throated roar thundered over the platform of the monorail station at Space Academy and suddenly the lively chatter and laughter of more than a hundred boys was stilled. Tumbling out of the gleaming monorail cars, they froze to quick attention, their eyes turned to the main exit ramp. They saw a short, squat, heavily built man, wearing the scarlet uniform of the enlisted Solar Guard, staring down at them, his fists jammed into his hips and his feet spread wide apart.

    pdf159p hotmoingay8 28-01-2013 11 1   Download

  • One September afternoon in 1751, towards half-past five, about a score of small boys, chattering, pushing, and tumbling over one another like a covey of partridges, issued from one of the religious schools of Chartres.

    pdf101p hotmoingay6 23-01-2013 15 0   Download

  • One September afternoon in 1751, towards half-past five, about a score of small boys, chattering, pushing, and tumbling over one another like a covey of partridges, issued from one of the religious schools of Chartres. The joy of the little troop just escaped from a long and wearisome captivity was doubly great: a slight accident to one of the teachers had caused the class to be dismissed half an hour earlier than usual, and in consequence of the extra work thrown on the teaching staff the brother whose duty it was to see all the scholars safe home was compelled to omit that part of...

    pdf72p nhokheo9 03-05-2013 23 0   Download

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