s********k 发帖数: 6180 | 1 【 以下文字转载自 EE 讨论区 】
发信人: silverhawk (silverhawk), 信区: EE
标 题: MTTF(mean time to failure)问题
发信站: BBS 未名空间站 (Tue Jul 12 18:53:17 2011, 美东)
假设N个DISK,每个都有constant failure rate(exponential distribution with
mean as T_f,MTTF mean time to failure of single disk is T_f),failure都是
indepedent的,那么N个disk都fail的MTTF应该是多少呢? |
|
s********k 发帖数: 6180 | 2 【 以下文字转载自 EE 讨论区 】
发信人: silverhawk (silverhawk), 信区: EE
标 题: MTTF(mean time to failure)问题
发信站: BBS 未名空间站 (Tue Jul 12 18:53:17 2011, 美东)
假设N个DISK,每个都有constant failure rate(exponential distribution with
mean as T_f,MTTF mean time to failure of single disk is T_f),failure都是
indepedent的,那么N个disk都fail的MTTF应该是多少呢? |
|
s********k 发帖数: 6180 | 3 假设N个DISK,每个都有constant failure rate(exponential distribution with
mean as T_f,MTTF mean time to failure of single disk is T_f),failure都是
indepedent的,那么N个disk都fail的MTTF应该是多少呢? |
|
x*h 发帖数: 757 | 4 至少一个fail的mttf应该是T_f/n,并且符合exponential.
如果N个都坏,我感觉有些复杂,exponential分布应该都不是很准确了。。.
不知道是不是需要数据试验拟合一下了。。 |
|
发帖数: 1 | 5 机械研究生求职,暑期实习或者coop工作机会均可,Product Design 方向, 简历文本
如下。
Zewen (James) Cao
256 Webster Ave, Apt 3, Jersey City, NJ 07307 ♦ [email protected]/* */
9830; (201)539-0239 ♦ www.linkedin.com/in/jameszewencao/
OBJECTIVE: Summer 2017 Mechanical Engineering Intern
EDUCATION
Stevens Institute of Technology, Hoboken, NJ
Master of Engineering in Mechanical Engineering
Aug
2016 – Present
GPA: 4... 阅读全帖 |
|
|
m*******o 发帖数: 625 | 7 lamda=1/T_f;
Y=max{X1,X2...X3}=X(rate=N*lamda)+X(rate=(N-1)*lamda)+...X(rate=lamda)
E{Y}=E{...}
=1/Nlamda+1/(N-1)lamda+...+1/lamda
不确定对不对 |
|
g**********t 发帖数: 475 | 8 你是对的。直观上讲,刚开始有N个元件,出现第一个损坏的时间符合指数分布,期望
是T_f/N。从出现第一个损坏开始重新计时,此时有N-1个元件,出现第二个损坏的时间
符合指数分布,期望是T_f/(N-1)。如此类推,最后只剩一个元件,其损坏的时间分布
还是指数分布,期望是T_f。把所有的等待时间加起来,就是
\sum_{i = 1}^{N}\frac{T_f}{i} |
|
|
D*****I 发帖数: 8268 | 10 老现象了,german engineering, MTTF, MTTR算的贼精 |
|
D*****I 发帖数: 8268 | 11 老现象了,german engineering, MTTF, MTTR算的贼精 |
|
w*******y 发帖数: 60932 | 12 Back Again. Arctic Cooling AF 9225L Black 90mm Ultra Quiet Case Fan $1.99 f
/s
Link:
http://www.mwave.com/mwave/SKUSearch.asp?px=DS&scriteria=AA7793
Description:
Arctic Cooling AF 9225L Black 90mm Ultra Quiet Case Fan
Features:
Ultra Quiet Case Fan
Circulation Optimized Fan Blades
High Airflow
High Static Pressure
Long Lifetime
The Fluid Dynamic Bearing offers a unique 400'000 h MTTF at 40癈.
|
|