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Shape Optimization Method for Structural Seal Design

An optimization method and design variable technology, applied in design optimization/simulation, constraint-based CAD, geometric CAD, etc., can solve problems such as poor practicability, achieve high design efficiency, ensure structural sealing, and strong engineering practicability

Active Publication Date: 2020-05-01
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0006] In order to overcome the shortcomings of poor practicability of existing shape optimization methods, the present invention provides a shape optimization method for structural sealing design

Method used

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  • Shape Optimization Method for Structural Seal Design
  • Shape Optimization Method for Structural Seal Design
  • Shape Optimization Method for Structural Seal Design

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Embodiment Construction

[0033] refer to Figure 1-4 . The specific steps of the shape optimization method of the structural sealing design of the present invention are as follows:

[0034] The present invention is illustrated by taking the shape optimization design of the low-pressure turbine rear axle 2 of the engine and the sealed runway 3 assembly as an example. The sealing runway 3 plays a role in sealing the lubricating oil cavity before the bearing between the low-pressure turbine rotors, preventing the lubricating oil from leaking and catching fire and causing the turbine to fail. Therefore, it is necessary to ensure that the surfaces of the interference fit 4 between the sealed runway 3 and the low-pressure turbine rear axle 2 are pressed against each other during work, and no gap can be produced.

[0035] Step 1: Using the axial symmetry of the structure about the center of rotation 1, create a geometric model of the meridian plane of the assembly of the low-pressure turbine rear shaft 2 and...

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Abstract

The invention discloses a shape optimization method for structural seal design. The technical problem that an existing shape optimization method is poor in practicability is solved. According to the technical scheme, finite element modeling, contact analysis and sensitivity solution are conducted on a considered assembly structure; zero contact force of a contact unit in a non-contact state is changed to be a corresponding contact gap timing one custom coefficient, and the problem that the sensitivity of the zero contact force is zero is avoided; a contact pressure value and the sensitivity thereof are obtained through calculation; a group of design conditions that the contact pressure is restricted by lower limit is introduced into an optimization design model, a gradient optimization algorithm is called, optimization iteration is conducted according to sensitivity information, and an optimization design result is obtained. Accordingly, the structural performance can be improved, andmeanwhile the design result of ensuring the structure sealing property is obtained; in addition, the needed iterative steps are within 100, the design efficiency is high, and the engineering practicability is high.

Description

technical field [0001] The invention relates to a shape optimization method, in particular to a shape optimization method for structural sealing design. Background technique [0002] Mechanical seals can prevent fluid leakage, maintain cavity pressure, and prevent accidental discharge of pollutants, and play an important role in the structure of products such as aerospace, automobiles, ships, and home appliances. The tightness of the mechanical seal is ensured by pressing the sealing element against the mating surface. Since the surface roughness cannot be completely eliminated even with the most refined processing method, for small contact pressure, the actual contact area on the sealing mating surface is very small, and a reliable seal cannot be formed. As the contact pressure increases, the actual contact surface also expands, until the contact pressure reaches a certain critical value, so that continuous contact clusters are formed between the sealing mating surfaces, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/17G06F30/23
CPCG06F30/17G06F30/23G06F2111/04
Inventor 张卫红牛草高彤
Owner NORTHWESTERN POLYTECHNICAL UNIV
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