Multi-objective optimization of a triple-eccentric butterfly valve considering structural safety and sealing...

Area of Science:

• Mechanical Engineering
• Materials Science
• Computational Fluid Dynamics

Background:

• Triple-eccentric butterfly valves are critical components where structural integrity and sealing efficiency dictate operational reliability and longevity.
• Existing designs often face challenges in balancing lightweight construction with robust performance under pressure.

Purpose of the Study:

• To develop a multi-objective optimization strategy for lightweight valve trim design.
• To enhance structural safety by minimizing maximum equivalent stress.
• To improve sealing performance through optimized sealing-specific pressure distribution.

Main Methods:

• A two-stage optimization approach combining topology optimization (TO) and response surface methodology optimization (RSM).
• Topology optimization was used for initial material distribution and parameter generation for RSM.
• RSM was employed for refining structural parameters and further optimization.

Main Results:

• Maximum equivalent stress in valve trims reduced from 290.85 MPa to 99.88 MPa.
• Maximum sealing-specific pressure decreased from 197.78 MPa to 77.83 MPa.
• A new method for assessing sealing performance based on fitting surface clearance was introduced.

Conclusions:

• The proposed optimization strategy effectively achieves a lightweight design while enhancing structural safety and sealing performance.
• The novel sealing assessment method provides intuitive evaluation and guidance for fitting tolerance design.
• Optimized valve trims demonstrate improved reliability and extended service life.