Study on the Effect of Operating Conditions on the Friction Pair Gap in a Wet Multi-Disc Clutch in a Helicopter Transmission System
Abstract
:1. Introduction
2. Mathematical Model of Multi-Disc Wet Clutch
2.1. Piston and Friction Components Axial Kinetic Model
2.2. Lubrication Model of Friction Pair
2.3. Friction Pair Asperity Contact Model
2.4. Torque Balance Model
3. Numerical Simulation
3.1. Simulation Parameters and Solution
3.2. Dynamic Response of Wet Friction Clutch
4. Results and Analysis
4.1. Rotation Speed
4.2. Control Oil Pressure
4.3. Lubricant Oil Temperature
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Parameter | Value | Parameter | Value |
---|---|---|---|
Outer radius of friction pairs | 0.094 m | Inertia of output shaft | 0.3 kg·m2 |
Outer radius of friction pairs | 0.06 m | Thickness of friction plate | 0.003 m |
Number of friction pairs n | 8 | Thickness of steel plate | 0.002 m |
Return spring stiffness | 1.52 × 106 N·m−1 | Asperities density | 7 × 107 m−2 |
Input rotation speed | 2388 rpm | Asperities radius R | 8 × 10−4 m |
Control oil pressure | 1.6 MPa | RMS roughness | 8.41 × 10−6 m |
Initial gap of friction pairs | 5 × 10−4 m | Equivalent Young’ modulus | 4.7 × 109 Pa |
Resistance torque | 460 N·m | Non-groove area coefficient | 0.78 |
Permeability | 4 × 10−13 m2 | Friction material thickness | 0.001 m |
Mass of friction plate | 0.6 kg | Mass of piston | 3 kg |
Mass of steel plate | 0.45 kg | Lubricant oil density | 875 kg·m−3 |
Spline friction coefficient | 0.1 | Damping coefficient | 0.08 N·s·m−1 |
Rotation Speed/rpm | Engagement Time/s | Disengagement Time/s | Gap Deviation Coefficient |
---|---|---|---|
888 | 0.8789 | 2.7044 | 0.6267 |
1688 | 1.0882 | 2.7053 | 0.6238 |
2488 | 1.3126 | 2.7065 | 0.6198 |
Oil Pressure/MPa | Engagement Time/s | Disengagement Time/s | Gap Deviation Coefficient |
---|---|---|---|
1.3 | 1.4590 | 2.6864 | 0.5774 |
1.5 | 1.3878 | 2.6981 | 0.6228 |
1.7 | 1.2389 | 2.7109 | 0.6270 |
Oil Temperature/°C | Engagement Time/s | Disengagement Time/s | Gap Deviation Coefficient |
---|---|---|---|
25 | 1.3536 | 3.0698 | 0.6255 |
55 | 1.3687 | 2.4370 | 0.6179 |
85 | 1.4617 | 2.3196 | 0.5977 |
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Li, X.; Yan, H.; Wei, D.; Wu, J.; Yin, M.; Xiao, Y.; Li, K. Study on the Effect of Operating Conditions on the Friction Pair Gap in a Wet Multi-Disc Clutch in a Helicopter Transmission System. Appl. Sci. 2024, 14, 7751. https://doi.org/10.3390/app14177751
Li X, Yan H, Wei D, Wu J, Yin M, Xiao Y, Li K. Study on the Effect of Operating Conditions on the Friction Pair Gap in a Wet Multi-Disc Clutch in a Helicopter Transmission System. Applied Sciences. 2024; 14(17):7751. https://doi.org/10.3390/app14177751
Chicago/Turabian StyleLi, Xiaokang, Hongzhi Yan, Dahuan Wei, Jiangming Wu, Mei Yin, Yexin Xiao, and Kefeng Li. 2024. "Study on the Effect of Operating Conditions on the Friction Pair Gap in a Wet Multi-Disc Clutch in a Helicopter Transmission System" Applied Sciences 14, no. 17: 7751. https://doi.org/10.3390/app14177751