A design method for cables of moving parts

Abstract

The present invention relates to a method for designing a cable for a moving component, and belongs to the field of cables. The present invention uses a flexible circuit board instead of a traditional copper-core wire to reduce the volume and weight of the cable. The flexible circuit board adopts an S-bend structural design to solve the cable extension problem caused by the displacement of the moving component. Design methods for the S-bend structural shape are provided for different displacement amounts. The flexible circuit board-based moving component cable design method of the present invention utilizes an S-bend cable structure instead of a traditional cable structure, thereby improving the ductility of the flexible circuit board and increasing the connection flexibility between moving components.

Description

Technical Field

[0001] The invention belongs to the field of cables, and in particular relates to a design method for a moving component cable. Background Art

[0002] Flexible printed circuits (FPCs) replace traditional copper-core wires, effectively reducing the size and weight of cables and are therefore increasingly being used for electrical interconnects within missile-borne equipment. In some missile-borne equipment, such as inertial measurement units (IMUs), inertial instruments are mounted to the cabin structure via vibration dampers. Under intense external motion excitation, these instruments can experience significant relative displacement relative to the cabin structure. Using FPCs to electrically interconnect inertial instruments with external electronic equipment can meet the design requirements for lightweight cables in confined spaces. However, due to the poor ductility of FPCs, cables used across moving parts require special design. Summary of the Invention

[0003] (1) Technical issues to be resolved

[0004] The technical problem to be solved by the present invention is how to provide a design method for a moving component cable to solve the cable extension problem caused by the displacement of the moving component.

[0005] (2) Technical solution

[0006] In order to solve the above technical problems, the present invention proposes a design method for a moving component cable, which includes the following steps:

[0007] Step 1: Draw a schematic diagram of the flexible circuit board cable designed with an S-bend structure. The relevant dimensional parameters include: the connection point between the moving part M1 and the connecting auxiliary line S1 is P1; the connection point between the moving part M2 and the connecting auxiliary line S2 is P2; the displacement of the moving part M1 in the three degrees of freedom of X, Y, and Z is ΔX, ΔY, and ΔZ; the vertical distance between the connection point P1 and the lower end boundary of the S-bend is L1; the horizontal distance between the connection point P1 and the right end boundary of the S-bend is L2; ​​the vertical distance between the extended lines of the upper and lower secants of the S-bend is a; and the horizontal distance between the end points of the upper and lower secants of the S-bend is b.

[0008] Step 2: Obtaining S-bend structural dimension parameters

[0009] The displacement in any direction at the connection point P1 is decomposed and projected into the three degrees of freedom directions of X, Y, and Z. The values ​​of the parameters ΔX, ΔY, and ΔZ are determined to solve other dimensional parameters of the S-bend structure.

[0010] Step 3: Calculate the constraint dimensions a and b

[0011] Under the premise that the parameters ΔX, ΔY, and ΔZ are known, the constraint relationship between them and other parameters is clarified as the basis for completing the S-bend structure design. That is, during the cable extension process, the constraint relationship between ΔX, ΔY, ΔZ, L1, L2, and the S-bend structure constraint dimensions a and b is as follows:

[0012]

[0013] Furthermore, the moving component M1 is an inertial instrument, and the moving component M2 is an external electronic device.

[0014] Furthermore, the moving component M1 is an external electronic device, and the moving component M2 is an inertial instrument.

[0015] Furthermore, the moving component M1 is the active end, that is, the connection point P1 is displaced.

[0016] Furthermore, the S-bend structure is located between two or more moving parts and serves to connect the moving parts. The entire S-bend structure includes an S-shaped structure, a connecting auxiliary line S1 and a connecting auxiliary line S2.

[0017] Furthermore, two connecting auxiliary lines respectively connect the moving component M1 and the moving component M2.

[0018] Furthermore, the upper end of the connecting auxiliary line S1 is connected to the moving component M1, and the lower end is connected to the lower left end of the S-bend structure.

[0019] Furthermore, the lower end of the connecting auxiliary line S2 is connected to the moving component M2, and the upper end is connected to the upper right end of the S-bend structure.

[0020] Furthermore, in the second step, the displacement at the connection point P1 is determined based on the electrical interconnection condition of the flexible circuit board.

[0021] Furthermore, after the third step, the method further includes: preparing a flexible circuit board cable according to the above constraint relationship.

[0022] (3) Beneficial effects

[0023] The present invention proposes a design method for a moving component cable. The moving component cable design method based on a flexible circuit board of the present invention utilizes an S-bend cable structure to replace a traditional cable structure, thereby improving the ductility of the flexible circuit board and increasing the connection flexibility between moving components. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of a flexible circuit board cable according to the present invention;

[0025] Figure 2 This is a schematic diagram of a flexible circuit board cable designed based on an S-bend structure according to the present invention. DETAILED DESCRIPTION

[0026] In order to make the purpose, content and advantages of the present invention more clear, the specific implementation methods of the present invention are further described in detail below with reference to the accompanying drawings and examples.

[0027] The present invention aims to provide a method for designing cables for moving components based on flexible circuit boards. Using flexible circuit boards instead of traditional copper-core wires can reduce the size and weight of cables. The flexible circuit boards employ an S-bend structural design to address cable stretching issues caused by moving component displacement. Design methods for S-bend structures are provided for different displacements. The present invention's method for designing cables for moving components based on flexible circuit boards utilizes an S-bend cable structure in place of a traditional cable structure, improving the ductility of the flexible circuit boards and increasing the flexibility of connections between moving components.

[0028] The S-bend structure is located between two or more moving parts and plays the role of connecting the moving parts, such as Figure 2 As shown, the entire S-bend structure includes an S-shaped structure (the middle part in the figure), a connecting auxiliary line S1 and a connecting auxiliary line S2 (the dotted part in the figure, the dotted line is only used to distinguish and illustrate the S-shaped structure, and is also part of the cable). The two connecting auxiliary lines respectively connect the moving part M1 and the moving part M2.

[0029] The upper end of the connecting auxiliary line S1 is connected to the moving component M1, and the lower end is connected to the lower left end of the S-bend structure.

[0030] The lower end of the connecting auxiliary line S2 is connected to the moving component M2, and the upper end is connected to the upper right end of the S-bend structure.

[0031] The S-bend structure is used to solve the cable extension problem caused by the displacement of the moving component. In this embodiment, the moving component M1 is set as the active end, that is, the displacement occurs at the connection point P1. The design method of the S-bend structure for different displacement amounts includes:

[0032] Step 1: Draw a schematic diagram of the flexible circuit board cable designed with an S-bend structure and mark the dimensions

[0033] The relevant size parameters are marked on Figure 2 middle:

[0034] Where: the connection point between the moving part M1 and the connecting auxiliary line S1 is P1; the connection point between the moving part M2 and the connecting auxiliary line S2 is P2; the displacement of the moving part M1 in the three degrees of freedom of X, Y, and Z is ΔX, ΔY, and ΔZ; the vertical distance between the connection point P1 and the lower end boundary of the S-bend is L1; the horizontal distance between the connection point P1 and the right end boundary of the S-bend is L2; ​​the vertical distance between the extended lines of the upper and lower secants of the S-bend (the S-bend constraint dimension) is a; and the horizontal distance between the end points of the upper and lower secants of the S-bend (the S-bend constraint dimension) is b.

[0035] Step 2: Obtaining S-bend structural dimension parameters

[0036] The displacement at the connection point P1 is determined based on the electrical interconnection of the flexible circuit board. The displacement in any direction at the connection point P1 can be decomposed and projected into the three degrees of freedom directions of X, Y, and Z. The values ​​of the parameters ΔX, ΔY, and ΔZ are clearly defined to solve other dimensional parameters of the S-bend structure, thereby completing the accurate design of the S-bend structure.

[0037] Step 3: Calculate the constraint dimensions a and b

[0038] On the premise that the parameters ΔX, ΔY, and ΔZ are known quantities, clarifying the constraint relationship between them and other parameters can serve as the basis for completing the S-bend structure design. That is, as long as each parameter satisfies the above constraint relationship, the flexible circuit board cable described in the present invention that solves the cable extension problem can be successfully constructed.

[0039] During the cable extension process, the constraint relationships of ΔX, ΔY, ΔZ, L1, L2, and the S-bend structure constraint dimensions a and b are as follows:

[0040]

[0041] The flexible circuit board cable for solving the cable extension problem of the present invention is prepared according to the above-mentioned constraint relationship.

[0042] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A design method for a moving component cable, characterized in that: The method comprises the following steps: Step 1: Draw a schematic diagram of the flexible circuit board cable designed with an S-bend structure. The relevant dimensional parameters include: the connection point between the moving part M1 and the connecting auxiliary line S1 is P1; the connection point between the moving part M2 and the connecting auxiliary line S2 is P2; the displacement of the moving part M1 in the three degrees of freedom of X, Y, and Z is ΔX, ΔY, and ΔZ; the vertical distance between the connection point P1 and the lower end boundary of the S-bend is L1; the horizontal distance between the connection point P1 and the right end boundary of the S-bend is L2; ​​the vertical distance between the extended lines of the upper and lower secants of the S-bend is a; and the horizontal distance between the end points of the upper and lower secants of the S-bend is b. Step 2: Obtaining S-bend structural dimension parameters The displacement in any direction at the connection point P1 is decomposed and projected into the three degrees of freedom directions of X, Y, and Z. The values ​​of the parameters ΔX, ΔY, and ΔZ are determined to solve other dimensional parameters of the S-bend structure. Step 3: Calculate the constraint dimensions a and b Under the premise that the parameters ΔX, ΔY, and ΔZ are known, the constraint relationship between them and other parameters is clarified as the basis for completing the S-bend structure design. That is, during the cable extension process, the constraint relationship between ΔX, ΔY, ΔZ, L1, L2, and the S-bend structure constraint dimensions a and b is as follows:

2. The method for designing a moving component cable according to claim 1, wherein: The moving part M1 is the inertial instrument, and the moving part M2 is the external electronic device.

3. The method for designing a moving component cable according to claim 1, wherein: The moving part M1 is the external electronic device, and the moving part M2 is the inertial instrument.

4. The method for designing a moving component cable according to claim 1, wherein: The moving part M1 is the active end, that is, displacement occurs at the connection point P1.

5. The method for designing a moving component cable according to claim 4, wherein: The S-bend structure is located between two or more moving parts and serves to connect the moving parts. The entire S-bend structure includes an S-shaped structure, a connecting auxiliary line S1 and a connecting auxiliary line S2.

6. The method for designing a moving component cable according to claim 4, wherein: The two connecting auxiliary lines respectively connect the moving part M1 and the moving part M2.

7. The method for designing a moving component cable according to claim 6, wherein: The upper end of the connecting auxiliary line S1 is connected to the moving component M1, and the lower end is connected to the lower left end of the S-bend structure.

8. The method for designing a moving component cable according to claim 6, wherein: The lower end of the connecting auxiliary line S2 is connected to the moving component M2, and the upper end is connected to the upper right end of the S-bend structure.

9. The method for designing a moving component cable according to claim 1, wherein: In the second step, the displacement at the connection point P1 is determined based on the electrical interconnection of the flexible circuit board.

10. The method for designing a moving component cable according to claim 9, wherein: The third step also includes: preparing a flexible circuit board cable according to the above constraint relationship.

Images