Up Time Magazine - February/March 2009 - (Page 64) Department of Corrections In the Dec/Jan issue, on page 49, in the article entitled “Research Brings Results” we printed an incorrect version of an equation. Following is the correct version and explanation. The corrected version can also be found in our digital edition. For Weibull analysis of components: at 63.2% of the cumulative distribution function, as this is a mathematical property of the distribution—in short, it’s the single point representation of durability that you discuss without all of the if/and/buts). The b is the shape factor. For components, b tells you how things died (i.e., b 1 infers wear-out failure modes)—it is important to let the data speak rather than pontificating about how things died. The term G(1+1/b) is called the Gamma function. For b = 0.5 the Gamma function is 2, for b = 1 the Gamma function is 1, and for b>1 MTBF or MTTF = h * G(1+1/b) Here, h is the characteristic life (i.e., the life it may be as small as 0.87 or as large as 1, so as a rough rule of thumb, the MTTF is roughly equal to h. You need to know the beta values to get the correct medicine because everyone will tell you things wear out, although, unfortunately, we kill more things than ever live long enough to wear out. (Note: On another website2, Dr. Robert Abernethy provides additional insight into the differences between MTBF and MTTF. Consulting his website may be important for students of the Weibull method.) Uptime + MRO-Zone.com = Reliability Solutions New! Uptime® Magazine has teamed with MRO-Zone.com to make it even easier to find the products, software, training and services you want. to request information about all the great strategies, techniques and technologies featured in each issue of Uptime Magazine. You can also find a comprehensive maintenance and reliability community calendar of conferences, training courses, workshop and seminars aswell. http://shopper.mro-zone.com Simply visit It’s the newest and easiest way to find what exactly you need. Try It Today! Company All Test Pro Allied Reliability Services AMP ARMS Baker CMMS Data Group Commtest CTC Datastick Des Case Easy Laser Hawk-IR iLearn/Mobius IRISS IVC Kittiwake Lubrication Engineers Ludeca 64 Page pg 14 pg 22 pg -pg 29 pg 36 pg 26 Inside Cover pg 2-3 pg 20 pg 65 pg 39 pg 25 pg 16 Back Cover pg 33 pg 59 pg 11 pg 15,17 Company Manufacturing Game MARCON Maximum Impact Simulcast MRO-Zone PdMA Page pg 33 pg 7 pg 44 pg 1 pg 23 Maintenance Conference.com pg 48 Philadelphia Mixing Solutions pg 4 Reliabilityweb.com Reliability Roadmap Sacs, Salvatore & Assoc SDT SKF/Baker SPM Trico UE Systems Ultrasound Technologies Vibration Institute Wilcoxon pg -pg 28 pg 13 pg 10 pg 21 pg 13 pg 43,45,57 pg 26 pg 41 pg 37,52 pg 59 february/march 2009 http://www.MRO-Zone.com http://www.MRO-Zone.com http://shopper.mro-zone.com http://www.maintenanceConference.com http://www.Reliabilityweb.com
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