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Shape optimization method for structural seal design

An optimization method and technology of design variables, applied in design optimization/simulation, calculation, constraint-based CAD, etc., can solve problems such as poor practicability, and achieve the effects of high design efficiency, improved structural performance, and strong engineering practicability

Active Publication Date: 2018-06-12
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] Reference Figure 1-4 . The specific steps of the shape optimization method for structural seal design of the present invention are as follows:

[0034] Taking the shape optimization design of the engine's low-pressure turbine rear axle 2 and the sealed runway 3 as an example to illustrate the present invention. Sealing the runway 3 serves as a seal for the lubricating oil cavity in front of the bearings between the low-pressure turbine rotors to prevent the lubricating oil from leaking and catching fire which may cause turbine failure. Therefore, it is necessary to ensure that the surface of the interference fit 4 between the sealed runway 3 and the low-pressure turbine rear axle 2 is pressed against each other during operation, and no gap can be generated.

[0035] Step 1: Use the axial symmetry of the structure about the center of rotation 1, create a geometric model of the meridian surface of the low-pressure turbine rear axle 2 and the sealed runway 3 in the commercia...

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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 seal design. Background technique [0002] Mechanical seals can prevent fluid leakage, maintain cavity pressure, and prevent accidental discharge of pollutants. It plays an important role in the structure of aerospace, automobiles, ships, home appliances and other products. The tightness of the mechanical seal is ensured by pressing the sealing element on the mating surface. Since even the most sophisticated processing method cannot completely eliminate the surface roughness, for a 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 a continuous contact cluster between the sealing mating surfaces can form a reliable seal. Th...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/23G06F2111/04
Inventor 张卫红牛草高彤
Owner NORTHWESTERN POLYTECHNICAL UNIV
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