12.4 Design of System Integration and Assembly
413
(2) Coordination of special tests and routine assembly. Because there were new
status and great challenges in the special test of the lunar lander, in the design of
technical process flow, the special tests should be treated as the key steps in the
process design, and the corresponding technical constraints, support conditions and
risk plans should be refined and quantified.
(3) Compatibility of technological guidance documents and technical process
flow. The technological guidance document was the criterion for assembly and manufacture. Therefore, according to the characteristics of technical process flow for the
lunar lander, it was necessary to classify and manage the technological guidance
documents.
12.4.5 Digital Assembly Simulation
AS an important part of the design of spacecraft assembly process under by digital
simulation, assembly simulation is the key of digital design in parallel. With digital
assembly simulation technology, the potential assembly defects in design can be
eliminated, and assemblability and maintainability of spacecraft configuration can
be evaluated, so as to identify the problems in the assembly process in advance
and significantly improve the design level of digital assembly process. Along with
application of digital technology, assembly simulation technology has become an
important method to optimize process design, shorten development cycle and reduce
assembly manufacture costs. The digital assembly simulation technology can be classified into three categories according to different functions and purposes: assembly
simulation centered on technological evaluation of product design, assembly simulation centered on process planning and assembly simulation centered on ergonomics
analysis.
1. Assembly Simulation Centered on Technological Evaluation of Product Design
The assembly simulation centered on technological evaluation of product design is
to intentional computer-aided design technology that analyzes assembly relationships of computer data models in a virtual environment in order to make better
assembly-related design decisions in design process. Combined with theory and
method of design-assembly (Design For Assembly, DFA), its basic task is to start
from the design principle and find the optimal solution for assembly under all kinds
of constraints to formulate the assembly process approach. Its purpose is to improve
the assemblability. Through trial assembly of models and quantitative analysis, the
structural features that are not easy to assemble or with poor assemblability in the
design of parts and components can be identified and modified to ensure feasible
assembly of designed products [15].
2. Assembly Simulation Centered on Process Planning
For the assembly process design of product, based on product information model
and assembly resource model, computer simulation and virtual reality technology
413
(2) Coordination of special tests and routine assembly. Because there were new
status and great challenges in the special test of the lunar lander, in the design of
technical process flow, the special tests should be treated as the key steps in the
process design, and the corresponding technical constraints, support conditions and
risk plans should be refined and quantified.
(3) Compatibility of technological guidance documents and technical process
flow. The technological guidance document was the criterion for assembly and manufacture. Therefore, according to the characteristics of technical process flow for the
lunar lander, it was necessary to classify and manage the technological guidance
documents.
12.4.5 Digital Assembly Simulation
AS an important part of the design of spacecraft assembly process under by digital
simulation, assembly simulation is the key of digital design in parallel. With digital
assembly simulation technology, the potential assembly defects in design can be
eliminated, and assemblability and maintainability of spacecraft configuration can
be evaluated, so as to identify the problems in the assembly process in advance
and significantly improve the design level of digital assembly process. Along with
application of digital technology, assembly simulation technology has become an
important method to optimize process design, shorten development cycle and reduce
assembly manufacture costs. The digital assembly simulation technology can be classified into three categories according to different functions and purposes: assembly
simulation centered on technological evaluation of product design, assembly simulation centered on process planning and assembly simulation centered on ergonomics
analysis.
1. Assembly Simulation Centered on Technological Evaluation of Product Design
The assembly simulation centered on technological evaluation of product design is
to intentional computer-aided design technology that analyzes assembly relationships of computer data models in a virtual environment in order to make better
assembly-related design decisions in design process. Combined with theory and
method of design-assembly (Design For Assembly, DFA), its basic task is to start
from the design principle and find the optimal solution for assembly under all kinds
of constraints to formulate the assembly process approach. Its purpose is to improve
the assemblability. Through trial assembly of models and quantitative analysis, the
structural features that are not easy to assemble or with poor assemblability in the
design of parts and components can be identified and modified to ensure feasible
assembly of designed products [15].
2. Assembly Simulation Centered on Process Planning
For the assembly process design of product, based on product information model
and assembly resource model, computer simulation and virtual reality technology