在生产设计过程中。为赋予产品可靠性而进行的工作称为可靠性设计。在整个设计过程中,把可靠性问题考虑进去,比产品投入生产以后发现不可靠因素进行改进要好的多。因为后者往往要在改变工夹模具、材料、工艺等方面付出很大的代价。
可靠性设计的主要内容包括制订可靠性指标,可靠性预测,可靠性分配以及与提高可靠性有关的具体设计工作和可靠性审查。
对可靠性特征量的要求称为可靠性指标。制订可靠性指标的工作包括确定指标项目和指标数值。一种产品的可靠性要求常常需要用几项指标来反映。指数分布失效的可靠性指标可用失效率或MTBF来表示;对于早期失效和耗损失效宜用可靠度和可靠寿命来表示;对于控制装置等可修复产品常用的还有有效度,即产品能工作的时间与能工作时间加不能工作时间之和的比值来表示。同一产品的可靠性特征量因条件、时间、功能而不同,因此在规定可靠性指标时必须明确是对应于什么条件、时间、功能的指标。例如对于接触可靠性指标必须规定负载电压、电流;规定偶然故障失效率必须同时规定偶然失效期延续时间即有效寿命。
Opto 22 SNAP-PS5-24DC Logic Power Supply
OPTO 22 SNAP 1/0 IDC5 4 CHANNEL DC INPUT
OPTO 22 SNAP-AIVRMS SNAP 2-Ch 0-250 V RMS AC/DC Analog Input Module
OPTO 22 SNAP I/O SNAP IDC5 4-Channel DC Input Module
OPTO 22 SNAP-PS5-24DC POWER SUPPLY
NEW OPTO 22 SNAP I/O 4 CHANNEL DC OUTPUT SNAP-ODC5SRC
OPTO 22 SNAP-ODC5SNK 4 CHANNEL DC OUTPUT MODULE
OPTO 22 SNAP-IDC5D 4 CHANNEL DC INPUT MODULE
OPTO 22 SNAP I/O Part No. SNAP IDC5 4 Channel DC Input
NEW OPTO 22 SNAP I/O SNAP-IDC5 4 CHANNEL DC INPUT 10-32VDC 5VDC LOGIG
OPTO 22 SNAP I/O SNAP IDC5 4-Channel DC Input Module
Opto 22 SNAP-0DC5SRC Solid State Relay I/O Module ! NEW !
From Canada
Opto 22 SNAP-PS5-24DC Logic Power Supply
OPTO 22 SNAP I/O Part No. SNAP IDC5 4 Channel DC Input
NEW OPTO 22 SNAP I/O 4 CHANNEL DC OUTPUT SNAP-ODC5SRC
Opto 22 SNAP I/O SNAP-ODC5SRC 4 Channel DC Output
OPTO 22 SNAP-AIVRMS SNAP 2-Ch 0-250 V RMS AC/DC Analog Input Module
Opto 22 SNAP I/O SNAP-IDC5FM 4 Channel DC Input
OPTO 22 SNAP I/O 4-CHANNEL DC OUTPUT MODULE SNAP-ODC5SRC *NEW*
NEW OPTO 22 Snap I/O SNAP-IDC5D 4 Channel DC Input
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