CN112131707A - Mockup-based simulation analysis method for influence of assembly tolerance on end precision of arm support - Google Patents
Mockup-based simulation analysis method for influence of assembly tolerance on end precision of arm support Download PDFInfo
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Abstract
The invention relates to a simulation analysis method for the influence of the assembly tolerance based on mockup on the precision of the tail end of an arm support, belonging to the technical field of simulation analysis methods for the influence of the assembly tolerance based on mockup on the precision of the tail end of the arm support; the technical problem to be solved is as follows: the improvement of the simulation analysis method for the influence of the assembly tolerance based on mockup on the precision of the end of the arm support is provided; the technical scheme for solving the technical problems is as follows: the method comprises the following steps: establishing a three-dimensional model of the arm support and assembling; primarily selecting a design tolerance, namely primarily selecting the design tolerance which influences the precision of the tail end of the arm support; carrying out target extraction definition of simulation analysis on the established three-dimensional model; simulation analysis is carried out on the precision influence of the end of the arm support through mockup software; circulating until the optimal design tolerance of the simulation analysis target meets the end precision of the arm support, and outputting an optimal value; outputting an optimization scheme according to the simulation analysis result of the optimal value, and guiding a production test through the optimization scheme; the invention is applied to arm support assembly.
Description
Technical Field
The invention discloses a mockup-based simulation analysis method for influence of assembly tolerance on the precision of an end of an arm support, and belongs to the technical field of simulation analysis methods for mechanical tolerance.
Background
The automatic cleaning system for the surface of the airplane has high requirement on the control precision of the tail end of the arm support, and the assembly tolerance of the arm support is a key link. The influence analysis of the design tolerance of the parts on the assembly tolerance of the cantilever crane mainly has the following problems at the present stage: the influence rule of the design tolerance of the parts on the assembly error of the arm support cannot be predicted, if the influence of the assembly tolerance of the arm support is calculated according to random distribution, the error is large and irregular, and the error compensation strategy of the arm support is directly influenced; therefore, it is necessary to provide an analysis method capable of performing analog simulation on the assembly tolerance of the boom so as to guide the production test.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to solve the technical problems that: the improvement of the simulation analysis method for the influence of the assembly tolerance based on mockup on the precision of the end of the arm support is provided.
In order to solve the technical problems, the invention adopts the technical scheme that: a simulation analysis method for the influence of the assembly tolerance on the end precision of an arm support based on mockup comprises the following steps:
the method comprises the following steps: establishing a three-dimensional model of the arm support and assembling;
step two: primarily selecting a design tolerance, namely primarily selecting the design tolerance which influences the precision of the tail end of the arm support;
step three: carrying out target extraction definition of simulation analysis on the three-dimensional model established in the step one;
step four: simulation analysis is carried out on the precision influence of the end of the arm support through mockup software;
step five: the fourth step is circulated until the optimal design tolerance of the simulation analysis target meets the precision of the tail end of the arm support, and an optimal value is output;
step six: and outputting an optimization scheme according to the simulation analysis result of the optimal value, and guiding a production test through the optimization scheme.
And the design tolerance initially selected in the step two is obtained by analyzing the arm support assembly, and comprises a hinge hole gap tolerance, a hole distance machining tolerance and a form and position tolerance of a reference surface.
In the fourth step, the step of performing simulation analysis on the analysis target through mockup software comprises the following steps:
step 3.1: simplifying the three-dimensional model established in the step one, converting the format of the simplified three-dimensional model into a format file supported by simulation software, and importing the format file into mockup software for calculation;
step 3.2: defining functional characteristics, specifically defining the functional characteristics participating in simulation calculation in each part, including hole, surface and axis characteristics;
step 3.3: defining tolerance, including form and position tolerance, size tolerance and conversion of design tolerance in a drawing, wherein the design tolerance includes linear tolerance and symmetry, namely, the linear tolerance is converted into position tolerance, and the symmetry is converted into profile tolerance for calculation;
step 3.4: defining an assembly sequence, and defining the assembly sequence of each part by referring to product design standards;
step 3.5: creating a measuring point, analyzing a simulation measuring target, and defining the measuring point;
step 3.6: defining a measurement operation, and setting assembly tolerance of the measurement points created in the step 3.5 respectively;
step 3.7: simulation analysis calculation, namely, performing simulation on the arm support assembly for multiple times by defining simulation preferences, and comparing analysis results;
step 3.8: confirming the precision of the tail end of the arm support according to the simulation analysis calculation result of the step 3.7, finishing the simulation when the precision of the tail end of the arm support meets the requirement, and guiding a production test through the simulation analysis calculation result; and when the precision of the tail end of the arm support does not meet the requirement, re-optimizing the design tolerance, and performing simulation analysis again according to the optimized design tolerance until the simulation analysis structure meets the precision requirement of the tail end of the arm support.
The step 3.1 of simplifying the three-dimensional model is to simplify the three-dimensional model by deleting parts which do not participate in mechanical error analysis.
The simulation analysis calculation in the step 3.7 is specifically simulated by a Monte Carlo method in mockup software.
And guiding a production test through the optimization scheme in the sixth step, guiding the production test according to the analysis result of each measurement point, the ultra-difference value and the ultra-difference rate of the sample in the horizontal or vertical direction, and performing targeted optimization design according to the contribution factors and the proportion.
The three-dimensional model of the arm support is specifically established by Unigraphics NX software.
Compared with the prior art, the invention has the beneficial effects that: according to the simulation analysis method provided by the invention, on the premise that the design tolerance of each part is known and the product is materialized, Vis Mockup is used for carrying out simulation analysis on the arm support assembly, the visual simulation of the assembly tolerance of the arm support is realized, the three-dimensional model is simplified, parts which do not participate in mechanical error analysis are deleted, the calculation time is shortened, a theoretical basis is provided for later-stage tests and design optimization which influence the precision of the tail end of the arm support, the workload of collecting arm support tolerance data in later-stage tests is reduced by using software simulation analysis, the labor, the material resources and the financial resources are saved, and the working efficiency is improved.
Drawings
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a flow chart of a simulation analysis method of the present invention;
fig. 2 is a schematic view of a boom structure in the embodiment of the invention;
FIG. 3 is a schematic view of a hinge hole of an arm according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a simulation measuring point of the boom in the embodiment of the invention;
fig. 5 is a diagram of a horizontal-Process simulation analysis result of the boom measurement point D in the embodiment of the present invention;
FIG. 6 is a diagram of a horizontal-HLM simulation analysis result of a boom measurement point D in the embodiment of the present invention;
FIG. 7 is a diagram of a vertical-Process simulation analysis result of an arm support measurement point D according to an embodiment of the present invention;
fig. 8 is a diagram of a vertical-HLM simulation analysis result of the boom measurement point D in the embodiment of the present invention.
In the figure: the device comprises a rotary table 1, a first connecting rod 2, a first connecting rod 3, a first connecting arm 4, a variable amplitude oil cylinder 5, a second connecting rod 6, a second connecting rod 7, a second connecting arm 8, a first folding arm oil cylinder 9, a third connecting rod 10, a third connecting rod 11, a third connecting arm 12, a second folding arm oil cylinder 13 and a flexible arm 14.
Detailed Description
As shown in fig. 1 to 8, the simulation analysis method for the influence of the assembly tolerance based on mockup on the precision of the end of the boom, provided by the invention, comprises the following steps:
the method comprises the following steps: establishing a three-dimensional model of the arm support and assembling;
step two: primarily selecting a design tolerance, namely primarily selecting the design tolerance which influences the precision of the tail end of the arm support;
step three: carrying out target extraction definition of simulation analysis on the three-dimensional model established in the step one;
step four: simulation analysis is carried out on the precision influence of the end of the arm support through mockup software;
step five: the fourth step is circulated until the optimal design tolerance of the simulation analysis target meets the precision of the tail end of the arm support, and an optimal value is output;
step six: and outputting an optimization scheme according to the simulation analysis result of the optimal value, and guiding a production test through the optimization scheme.
And the design tolerance initially selected in the step two is obtained by analyzing the arm support assembly, and comprises a hinge hole gap tolerance, a hole distance machining tolerance and a form and position tolerance of a reference surface.
In the fourth step, the step of performing simulation analysis on the analysis target through mockup software comprises the following steps:
step 3.1: simplifying the three-dimensional model established in the step one, converting the format of the simplified three-dimensional model into a format file supported by simulation software, and importing the format file into mockup software for calculation;
step 3.2: defining functional characteristics, specifically defining the functional characteristics participating in simulation calculation in each part, including hole, surface and axis characteristics;
step 3.3: defining tolerance, including form and position tolerance, size tolerance and conversion of design tolerance in a drawing, wherein the design tolerance includes linear tolerance and symmetry, namely, the linear tolerance is converted into position tolerance, and the symmetry is converted into profile tolerance for calculation;
step 3.4: defining an assembly sequence, and defining the assembly sequence of each part by referring to product design standards;
step 3.5: creating a measuring point, analyzing a simulation measuring target, and defining the measuring point;
step 3.6: defining a measurement operation, and setting assembly tolerance of the measurement points created in the step 3.5 respectively;
step 3.7: simulation analysis calculation, namely, performing simulation on the arm support assembly for multiple times by defining simulation preferences, and comparing analysis results;
step 3.8: confirming the precision of the tail end of the arm support according to the simulation analysis calculation result of the step 3.7, finishing the simulation when the precision of the tail end of the arm support meets the requirement, and guiding a production test through the simulation analysis calculation result; and when the precision of the tail end of the arm support does not meet the requirement, re-optimizing the design tolerance, and performing simulation analysis again according to the optimized design tolerance until the simulation analysis structure meets the precision requirement of the tail end of the arm support.
The step 3.1 of simplifying the three-dimensional model is to simplify the three-dimensional model by deleting parts which do not participate in mechanical error analysis.
The simulation analysis calculation in the step 3.7 is specifically simulated by a Monte Carlo method in mockup software.
And guiding a production test through the optimization scheme in the sixth step, guiding the production test according to the analysis result of each measurement point, the ultra-difference value and the ultra-difference rate of the sample in the horizontal or vertical direction, and performing targeted optimization design according to the contribution factors and the proportion.
The three-dimensional model of the arm support is specifically established by Unigraphics NX software.
According to the simulation analysis method for the influence of the assembly tolerance based on the Mockup on the precision of the end of the arm support, which is provided by the invention, the Vis Mockup is used for carrying out simulation analysis on the arm support assembly by adopting a reverse thinking mode on the premise that the design tolerance of each part is known and the product is materialized, so that the visual simulation of the assembly tolerance of the arm support is realized. Mainly solves the following technical problems:
1) the method comprises the following steps of (1) performing visual simulation on the influence rule of arm support part tolerance design on arm support assembly tolerance, guiding a production test and providing theoretical data;
2) and analyzing contribution factors and contribution proportions influencing the assembly tolerance of the arm support, and guiding later development and improved design.
Before performing simulation analysis, the simulation analysis method of the invention needs to analyze the boom assembly, and select a primarily selected design tolerance, the boom assembly in this embodiment is a four-section boom, as shown in fig. 2, and through detailed analysis of the boom assembly, the boom assembly of this embodiment mainly includes three groups of link mechanisms and a flexible arm 14, the first link mechanism includes a turntable 1, a section arm 2, a first link 3, a first connecting arm 4, a luffing cylinder 5, and a connecting shaft (not labeled), the second link mechanism includes a section arm 2, a section arm 6, a second link 7, a second connecting arm 8, a first folding cylinder 9, and a connecting shaft (not labeled), and the third link mechanism includes a section arm 6, a section arm 10, a third link 11, a third connecting arm 12, and a second folding cylinder 13, and the connecting shaft (not labeled) is omitted. Each group of connecting rod structures comprises 6 hinge holes, as shown in fig. 3, a schematic diagram of a joint arm hinge hole is shown, 18 hinge holes are in clearance tolerance fit in total, 33 groups of hole distance machining tolerances and form and position tolerances of a reference surface all affect the mechanical assembly tolerance precision of the arm support in the embodiment, and many influence factors exist.
The arm support in this embodiment is shown in fig. 4, wherein one end of one arm is fixedly connected to the turntable, the end of the one arm is connected to a two-joint arm, the end of the two-joint arm is connected to a three-joint arm, and the end of the three-joint arm is connected to the flexible arm, wherein the end of the one arm is set as a measurement point a, the end of the two-joint arm is set as a measurement point B, the end of the three-joint arm is set as a measurement point C, and the end of the flexible arm is set as a measurement point D.
Firstly, three-dimensional modeling is carried out on the arm support, then, parts are assembled, after the arm support assembly is analyzed, a simulation analysis target is extracted, and then, simulation analysis of the target is carried out, wherein the simulation analysis target in the embodiment is a measuring point A, B, C, D; the simulation analysis process comprises the following steps:
1) inputting parts, simplifying an NX three-dimensional model, deleting parts which do not participate in mechanical error analysis, such as caps, bolts, washers, nuts, oil cups and the like, wherein the number of the parts exceeds 400, so that the complexity of the model is high, the calculation speed is seriously influenced, the parts tightly play the roles of fastening, injecting lubricating media and the like in a mechanical structure, and no influence is generated on the assembly error of the tail end of the mechanical arm. Therefore, only main parts such as a first arm, a second arm, a third arm, a flexible arm, an oil cylinder, a connecting rod, a connecting arm, a connecting shaft and the like which participate in analysis are reserved, so that the size of a document is reduced, the calculation time is shortened, the document is converted into an stp format file supported by simulation software, and the stp format file is imported into TC Visualization Mockup software for calculation.
2) Functional features are defined, including features such as holes, faces, axes, and the like. And defining the functional characteristics of each part participating in simulation calculation. Taking a one-section arm as an example, 6 groups of holes involved in the one-section arm shown in fig. 3 are respectively defined, including the diameter and length of the holes.
3) Tolerances are defined, including form and location tolerances, dimensional tolerances, and the like. Due to the self-characteristics of software, the nominal size can default to the size in the three-dimensional model, and manual input is not needed; some design tolerances in the drawings, such as linear tolerance and symmetry, need to be converted into position tolerance and contour tolerance for calculation.
Taking a section of arm as an example, the following tolerance information is included together:
create benchmark A, B, C, as shown in Table 1:
6 hole dimensional tolerances, as shown in table 2:
the 5 sets of pitch size tolerances, as shown in table 3:
since there is no linear dimensional tolerance in mockup, it is calculated by converting it to the positional degree of each hole. Because the linear tolerance zone is square and the position tolerance zone is circular, the problem of inconsistency appears at four corners, and the converted position tolerance zone is contained in the original linear tolerance zone and does not influence the calculation result. The above linear tolerances for each pitch were converted to hole position degrees as shown in table 4 below:
6 form and position tolerances, as shown in Table 5:
4) and defining an assembly sequence, wherein the assembly sequence of each part needs to refer to the selection of a product design standard, so that the assembly sequence is defined. In this embodiment, the first link mechanism is taken as an example to explain an assembly sequence, and the assembly sequence of the second link mechanism and the third link mechanism is similar to that of the first link mechanism and is not described again. The first connecting rod mechanism is assembled in the sequence of turntable → connecting rod connecting shaft of turntable → connecting arm → connecting shaft of connecting arm of turntable → one section of arm → connecting shaft of connecting arm of connecting rod → variable amplitude oil cylinder → connecting shaft of connecting arm of variable amplitude oil cylinder.
The assembly sequence of the first linkage set up in mockup includes:
defining assembly operation-first connecting rod 3to turntable 1, namely, first connecting rod 3 is assembled on turntable 1, and defining constraint relation of hole and end face;
defining the assembly operation, namely a turntable connecting rod connecting shaft to a first connecting rod 3, namely the turntable connecting rod connecting shaft is assembled on the first connecting rod 3 and comprises the constraint relation of a shaft hole and an end face;
defining assembly operation-the first connecting arm 4to the turntable 1, namely the first connecting arm 4 is assembled on the turntable, and defining the constraint relation between the hole and the end surface;
defining the assembly operation-the turntable connecting arm connecting shaft to the first connecting arm 4, namely the turntable connecting arm connecting shaft is assembled on the first connecting arm 4 and comprises the constraint relation of the shaft hole and the end surface;
defining assembly operation, namely, a section of arm 2 is assembled on the rotary table 1 to define the constraint relation between a hole and an end face;
defining assembly operation, namely a connecting shaft of a first section of arm of the rotary table to a first section of arm 2, namely assembling the connecting shaft of the first section of arm of the rotary table on the first section of arm 2, wherein the connecting shaft comprises a shaft hole and a constraint relation of end surfaces;
defining assembly operation, namely, a section of arm connecting shaft to a section of arm 2, namely, the section of arm connecting shaft is assembled on the section of arm 2 and contains the constraint relation between a shaft hole and an end face;
defining the assembly operation, namely a connecting rod connecting arm connecting shaft to a first connecting rod 3, namely the connecting rod connecting arm connecting shaft is assembled to the first connecting rod 3 and contains the constraint relation of a shaft hole and an end face;
defining assembly operation, namely a variable amplitude oil cylinder 5to a section of arm 2, namely the variable amplitude oil cylinder 5 is assembled on the section of arm 2, and defining the constraint relation between a hole and an end face;
defining assembly operation, namely, a connecting shaft of the amplitude-variable oil cylinder of one section of arm is assembled to a section of arm 2, wherein the connecting shaft of the amplitude-variable oil cylinder of one section of arm comprises a constraint relation between a shaft hole and an end surface;
and defining the assembling operation, namely the connecting shaft of the connecting arm of the luffing cylinder to the first connecting arm 4, namely the connecting shaft of the luffing cylinder is assembled to the first connecting arm 4 and comprises the constraint relation of the shaft hole and the end surface.
Defining the assembly sequence of the parts, namely establishing mutual constraint conditions among the parts, wherein the definition criteria comprise:
the introduced three-dimensional model assembly only displays the parts at proper positions in the mockup, but the original matching cannot be recognized, and the assembling operation is to remount the parts and retrain the assembling relation.
According to the sequential logic order of assembly, if the shaft is installed on the hole, the object is defined as the shaft, and the target is the hole, so that the assembly relation is determined.
The constraint object is defined to be mobile with a fixed goal.
In mockup analysis, it is required that the paired features are opposite in normal vector direction.
5) And (3) creating measuring points, analyzing a simulation measuring target, and defining the measuring points, namely a point A, a point B, a point C and a point D in the drawing.
6) Measurement operations, i.e., (Xa, Ya), (Xb, Yb) (Xc, Yc), (Xd, Yd) four sets of measurement data indicated in fig. 2 are defined and set with assembly tolerances, respectively. In the embodiment, according to the control accuracy of the tail end of the arm support of +/-10 mm, the control of the precision influence of the tail end of the arm support caused by the assembly tolerance of +/-2 mm is reasonable. Therefore, the assembly tolerance of the simulation target, namely the A points Xa and Ya is set to be +/-1 mm, the B points Xb and Yb is set to be +/-2 mm, the C points Xc and Yc are set to be +/-2 mmm, and the D points Xd and Yd are set to be +/-2 mm.
7) And (3) simulation analysis and calculation, wherein a Monte Carlo method is provided in Mockup software to perform the simulation, 5000 times, 10000 times, 20000 times and 40000 times of simulation are performed on the arm support assembly by defining simulation preferences, and analysis results are compared to obtain simulation analysis results. When the simulation times reach 40000 times, the analysis results are basically consistent, so that the simulation result obtained when the simulation times reach 40000 times is finally selected as the judgment basis of the mechanical assembly error analysis.
8) In this embodiment, the simulation result obtained when the simulation is performed 40000 times is selected as the judgment basis for the analysis of the mechanical assembly error, and the simulation analysis result of the measurement point A, B, C, D is shown in the following table 6:
9) the simulation result guides a production test, and according to the analysis result of the measuring point D at the tail end of the arm support, the assembling tolerance of the arm support analyzed by the Monte Carlo method can be judged to be normally distributed, the horizontal over-differential value of the measuring point D is 3.4174mm, the horizontal over-differential value is controlled within +/-2 mm, and the over-differential rate is 0; the vertical over-tolerance value is 4.9569mm, the probability of exceeding +/-2 mm is 0.0666%, and the 99.9334% simulation results meet the expected requirements, so that the conclusion that the dimensional accuracy of the tail end of the arm support in the horizontal and vertical directions is within +/-2 mm can be obtained, and the conclusion is directly used for guiding production tests. The simulation results of the measuring point A, B, C are not directly used for guiding production tests, but are only used for judging the influence of assembly tolerance on each knuckle arm as a final judgment reference.
10) And (5) guiding later-stage design optimization by a simulation result. And according to the contribution factors and the proportion, the design is improved in a targeted manner.
According to the invention, a reverse thinking mode is applied, and Vis Mockup software is utilized to perform simulation analysis on the assembly error of the arm support on the premise of knowing the design tolerance of each part and materializing the product, so as to guide the actual production test; the invention presents the influence factors influencing the assembly error of the arm support according to the contribution factors and the contribution proportion, guides the design optimization, shortens the development period of new products and reduces the research and development cost.
It should be noted that, regarding the specific structure of the present invention, the connection relationship between the modules adopted in the present invention is determined and can be realized, except for the specific description in the embodiment, the specific connection relationship can bring the corresponding technical effect, and the technical problem proposed by the present invention is solved on the premise of not depending on the execution of the corresponding software program.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. A simulation analysis method for the influence of the assembly tolerance on the end precision of an arm support based on mockup is characterized in that: the method comprises the following steps:
the method comprises the following steps: establishing a three-dimensional model of the arm support and assembling;
step two: primarily selecting a design tolerance, namely primarily selecting the design tolerance which influences the precision of the tail end of the arm support;
step three: carrying out target extraction definition of simulation analysis on the three-dimensional model established in the step one;
step four: simulation analysis is carried out on the precision influence of the end of the arm support through mockup software;
step five: the fourth step is circulated until the optimal design tolerance of the simulation analysis target meets the precision of the tail end of the arm support, and an optimal value is output;
step six: and outputting an optimization scheme according to the simulation analysis result of the optimal value, and guiding a production test through the optimization scheme.
2. The simulation analysis method for the influence of the assembly tolerance on the end precision of the arm support based on the mockup as claimed in claim 1, wherein: and the design tolerance initially selected in the step two is obtained by analyzing the arm support assembly, and comprises a hinge hole gap tolerance, a hole distance machining tolerance and a form and position tolerance of a reference surface.
3. The simulation analysis method for the influence of the assembly tolerance on the end precision of the boom based on the mockup as claimed in claim 2, wherein: in the fourth step, the step of performing simulation analysis on the analysis target through mockup software comprises the following steps:
step 3.1: simplifying the three-dimensional model established in the step one, converting the format of the simplified three-dimensional model into a format file supported by simulation software, and importing the format file into mockup software for calculation;
step 3.2: defining functional characteristics, specifically defining the functional characteristics participating in simulation calculation in each part, including hole, surface and axis characteristics;
step 3.3: defining tolerance, including form and position tolerance, size tolerance and conversion of design tolerance in a drawing, wherein the design tolerance includes linear tolerance and symmetry, namely, the linear tolerance is converted into position tolerance, and the symmetry is converted into profile tolerance for calculation;
step 3.4: defining an assembly sequence, and defining the assembly sequence of each part by referring to product design standards;
step 3.5: creating a measuring point, analyzing a simulation measuring target, and defining the measuring point;
step 3.6: defining a measurement operation, and setting assembly tolerance of the measurement points created in the step 3.5 respectively;
step 3.7: simulation analysis calculation, namely, performing simulation on the arm support assembly for multiple times by defining simulation preferences, and comparing analysis results;
step 3.8: confirming the precision of the tail end of the arm support according to the simulation analysis calculation result of the step 3.7, finishing the simulation when the precision of the tail end of the arm support meets the requirement, and guiding a production test through the simulation analysis calculation result; and when the precision of the tail end of the arm support does not meet the requirement, re-optimizing the design tolerance, and performing simulation analysis again according to the optimized design tolerance until the simulation analysis structure meets the precision requirement of the tail end of the arm support.
4. The simulation analysis method for the influence of the assembly tolerance on the end precision of the arm support based on the mockup as claimed in claim 3, wherein: the step 3.1 of simplifying the three-dimensional model is to simplify the three-dimensional model by deleting parts which do not participate in mechanical error analysis.
5. The simulation analysis method for the influence of the assembly tolerance on the end precision of the arm support based on the mockup as claimed in claim 4, wherein: the simulation analysis calculation in the step 3.7 is specifically simulated by a Monte Carlo method in mockup software.
6. The simulation analysis method for the influence of the assembly tolerance on the end precision of the arm support based on the mockup as claimed in claim 4, wherein: and guiding a production test through the optimization scheme in the sixth step, guiding the production test according to the analysis result of each measurement point, the ultra-difference value and the ultra-difference rate of the sample in the horizontal or vertical direction, and performing targeted optimization design according to the contribution factors and the proportion.
7. The simulation analysis method for the influence of the mockup-based assembly tolerance on the end precision of the boom according to any one of claims 1 to 6, wherein the method comprises the following steps: the three-dimensional model of the arm support is specifically established by Unigraphics NX software.
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