Title: Study on the end correction of extended-tube expansion chamber hydraulic pulsation attenuator with viscoelastic materials

Authors: Chaozhong Meng; Fan Yang; Jiaxin Yu; Hongjie Fan; Tingyu Liu; Xuepeng Cao

Addresses: Ministry of Education Key Laboratory of Testing Technology for Manufacturing Process, Southwest University of Science and Technology, Mianyang, 621010, China; Institute of Hydromechtronics, Chang'an University, Xi'an, 710064, China ' Ministry of Education Key Laboratory of Testing Technology for Manufacturing Process, Southwest University of Science and Technology, Mianyang, 621010, China; Institute of Hydromechtronics, Chang'an University, Xi'an, 710064, China ' Ministry of Education Key Laboratory of Testing Technology for Manufacturing Process, Southwest University of Science and Technology, Mianyang, 621010, China; Institute of Hydromechtronics, Chang'an University, Xi'an, 710064, China ' Ministry of Education Key Laboratory of Testing Technology for Manufacturing Process, Southwest University of Science and Technology, Mianyang, 621010, China; Institute of Hydromechtronics, Chang'an University, Xi'an, 710064, China ' Ministry of Education Key Laboratory of Testing Technology for Manufacturing Process, Southwest University of Science and Technology, Mianyang, 621010, China; Institute of Hydromechtronics, Chang'an University, Xi'an, 710064, China ' Ministry of Education Key Laboratory of Testing Technology for Manufacturing Process, Southwest University of Science and Technology, Mianyang, 621010, China; Institute of Hydromechtronics, Chang'an University, Xi'an, 710064, China

Abstract: Water-jet-guided laser (WJGL) systems require ultra-stable hydraulic pressure (<5% pulsation amplitude at 0-1000 Hz). Current viscoelastic-lined pulsation attenuators lack standardised characterisation methods, leading to significant errors in impedance modelling. This study proposes a novel end-correction formula incorporating viscoelastic material parameters (sound speed, bulk modulus) for extended-tube expansion chambers (VMETC). Based on the finite element analysis and experimental validation results, the formula demonstrates good universality across 441 parameter combinations, with 71.4% of the combinations exhibiting errors below 5%.

Keywords: end correction; extended-tube expansion chamber; finite element analysis; electrohydraulic analogue; viscoelastic metamaterials; impedance modelling.

DOI: 10.1504/IJHM.2026.154222

International Journal of Hydromechatronics, 2026 Vol.9 No.2, pp.210 - 228

Received: 09 May 2025
Accepted: 14 Sep 2025
Published online: 17 Jun 2026 *

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