文档介绍：DOE-HDBK-1140-2001
DESIGN FOR MAINTAINABILITY
This section contains human factors guidance for designing systems, subsystems, equipment and facilities
so that maintenance is easy and cost effective.
Unitization, modularization, and standardization
Unitization refers to separating equipment into physically and functionally distinct units to allow for easy
removal and replacement. This type of equipment separation will permit division of maintenance
responsibility, especially troubleshooting, among various maintenance levels. Modularization refers to
unitized equipment in which the functional units making up a module are integrated and are removed or
inserted as a unit.
Goals of unitization/modularization. Unit design/modularization of equipment should
a. Maximize the efficiency and accuracy of on-line replacement of ponents.
b. Facilitate and minimize troubleshooting time at each level of maintenance activity.
c. Allow test, checkout, troubleshooting, and repair procedures to be unit specific and structured to aid
in identification of faulty units, then subunits, etc.
d. Reduce down-time.
e. Provide easy access to ponents.
f. Allow for high degree of standardization.
g. Minimize time and cost of maintenance training.
h. Simplify new equipment design and shorten design time by using previously developed, standard
"building blocks."
General principles for unitization/modularization design
Division of equipment into modules. Equipment should be divided into as many modules as are
electrically and mechanically feasible in keeping with efficient use of space and overall equipment
reliability.
Uniformity. All modules ponent parts should be approximately uniform in basic size and
shape for the best packaging, ease of replacement and minimizing spare-parts inventory.
monalty. A module should ponents that contribute to a si