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In order to meet the specification frequency level, the automotive wiring harness test equipment must meet the set accuracy level or level. This allows them to be tested at their respective levels, each of which typically contains a series of single parameters to specify the test equipment. In addition to the tolerances of the recorded test values, there are inherent performance parameters for some devices, such as background disturbances or dynamic ranges. As part of the test procedure, the test accuracy is mainly reflected in three different locations, the first is the high-frequency interface of the test equipment, the so-called "baseline value", the other two are the permanent connection and the channel connection point.
     The similarities and differences between the assembly planning and piping of the automotive wiring harness in the virtual environment are: the automotive wiring harness is flexible and deformable in the layout design stage and the assembly process planning stage. The pipeline can be treated as a flexible body in the layout design stage. In the assembly process planning stage, as a rigid body involved in the entire product assembly process simulation. Based on the above two points, the following scheme can be used: the layout design and assembly process planning of the harness is integrated. The layout design process is the forming process of the assembly process. The harness assembly can be obtained by recording the layout design process Process, and pipeline assembly process planning and layout design is relatively independent.
      In the virtual environment, the harness assembly planning system consists of five stages: the data preparation stage, the initial model establishment stage, the interactive layout design and the assembly process planning stage, the planning result post-processing stage and the process data scene browsing stage. Data preparation phase The assembly staff through the conversion interface, the three-dimensional environment in the product assembly model, car harness connector model, line card model, pipeline connector model into a neutral file, and stored in the local work directory, Neutral files based on the establishment of harness connector library, line card library and pipe connector library for subsequent modules to use. Initial model establishment stage The assembly planner introduces the product assembly model neutral document in the virtual environment and completes the reconstruction of the model information, and carries on the product assembly process planning in the virtual environment. When an assembly process design for an automotive wiring harness is required, the modeling module of the harness or tubing is started to establish the initial model of the wire harness or line so that the subsequent module completes the harness or pipe by manipulating and dynamically modifying the initial model Layout design and assembly process planning.
     In order to improve the convenience and fastness of model control, a beam harness positioning method based on geometric constraint is proposed, which mainly includes precise positioning and geometric constraint based dynamic navigation under geometric constraints to assist designers to quickly determine harness, pipe and rigidity The positional relationship between the structural members, thereby assembling the harness in place.