CFD 기반 누설 특성 반영을 통한 다행정 레이디얼 피스톤 모터의 성능 해석

다국어 초록 (Multilingual Abstract)

A multi-stroke radial piston motor has a structure in which the piston stroke is repeated according to the number of lobes on the stroke ring, thereby providing high torque density and good performance even in low-speed operating ranges. However, the torque characteristics of the motor vary significantly depending on the stroke ring geometry, and the volumetric efficiency may deteriorate due to internal leakage that is difficult to quantify. Therefore, a quantitative evaluation of leakage losses and their appropriate incorporation into a system-level model are essential. In this study, a multi-stroke radial piston motor with 10 pistons and 8 lobes is considered, and a hydraulic system simulation model that reflects the multi-stroke driving characteristics is constructed in the Simcenter Amesim environment. Leakage parameters that are difficult to estimate from geometric information alone are identified through inverse analysis based on CFD results obtained using Simerics MP+ and incorporated into the model. Using the developed model, the output torque, volumetric efficiency, and torque ripple characteristics of the motor are evaluated. The simulation results show that the model with CFD-based leakage parameters exhibits torque curves that show good agreement with the manufacturer’s catalog data, thereby confirming the reliability of the model. The proposed model can serve as an effective design tool for quickly assessing the influence of leakage characteristics on the performance of multi-stroke radial piston motors at the design stage. This paper consists of six chapters, and the summary of each chapter is as follows. Chapter 1 describes the background, research objectives, and overall scope of the study. Chapter 2 describes the geometry, main specifications, and operating principle of the target multi-stroke radial piston motor. Chapter 3 presents the mathematical models for the stroke ring profile, piston kinematics, torque generation, distributor port opening area, and leakage flows. Chapter 4 explains the construction of the Simcenter Amesim system-level model and the Simerics MP+ CFD model used to identify lumped leakage parameters. Chapter 5 presents the simulation results, including CFD-based leakage characteristics, lumped-parameter estimation, and model validation against the manufacturer’s catalog torque curves. In addition, the influence of leakage-related parameters on pressure characteristics, torque behavior, and efficiency is investigated. Chapter 6 summarizes the main conclusions of this study.

목차 (Table of Contents)

• 제 1 장 서 론 1
• 1.1 연구 배경 및 목적 1
• 1.2 논문 구성 2
• 제 2 장 연구 대상 모터 3
• 제 3 장 수학적 모델링 6
• 3.1 행정 링 형상 및 피스톤 운동 모델 6
• 3.2 유체 분배기 개구면적 9
• 3.3 누설 모델 12
• 3.3.1 피스톤과 실린더 하우징 사이의 누설 12
• 3.3.2 유체 분배기와 실린더 하우징 사이의 누설 13
• 제 4 장 시뮬레이션 모델 14
• 4.1 Amesim 시뮬레이션 모델 14
• 4.2 CFD 모델 18
• 제 5 장 시뮬레이션 결과 22
• 5.1 CFD 해석 결과 및 집중 파라미터 추정 22
• 5.2 Amesim 시뮬레이션 결과 24
• 5.3 파라미터 민감도 분석 29
• 5.4 제조사 실험 데이터 기반 토크 특성 비교 33
• 제 6 장 결론 35
• 참고 문헌 36