Design and Physical Prototyping of a Novel Braking System for a Helicopter Rotor
Abstract
:1. Introduction
2. Design Development
2.1. Product Design Specification (PDS)
2.2. Concept Generation
2.3. Concept Evaluation and Selection
3. Modelling and Simulation
3.1. Modelling
3.2. Simulation
4. Experimental Measurement of Friction
4.1. Test Materials
4.2. Testing Platform
4.3. Results
- Incremental loading increase (gradually increasing the engagement torque at suitable increments, noting the maximum torque before slip and the quasi static holding torque post slip, achieved for all materials);
- Variation of peak and quasi-static holding torques at different loading rates (i.e., the speed at which the Dartec machine rotated, increasing the rate of loading torque);
- Cyclic loading (once suitable engagement torques were found for each material to obtain the required 400 nm of holding torque, repeated loading up to this value and then released back down to just above zero was completed over several iterations to observe the behaviour of the clamping arrangement, loaded/unloaded up to the required torque in 20 s intervals).
5. Prototype Development
6. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
Appendix A
References
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Specification | Value |
---|---|
Holding torque (Nm) | 400 |
Maximum radial dimension of system (mm) | 290 |
Maximum axial dimension of system (mm) | 300 |
Target system mass (kg) | <10 |
Max. engagement period (without electrical input) (h) | 48 |
Minimum safety factor (unit-less) | 1.5 |
Temperature range (°C) | −55 to +85 |
Time of engagement (s) | <25 |
Time of depowered full holding torque capability (h) | 48 |
Non-discrete engagement method | |
Fail safe operation | |
Design intent:
|
Criteria | Rank |
---|---|
Hold/locate resolution (continuous-discrete locking) | 1 |
Low Unit mass/volume | 2 |
High reliability/Low susceptibility to failure/Fault Tolerance | 3 |
Low cost | 4 |
Scalability | 5 |
Robustness | 6 |
High transmission efficiency | 7 |
Installation ease/Maintainability/Serviceability | 8 |
Loading Rate | ||||
---|---|---|---|---|
Material | 0.01°/s | 0.1°/s | 1°/s | |
GBC | Peak | 0.87 | 0.872 | 0.878 |
Quasi-static | 0.855 | 0.855 | 0.852 | |
MR2215 | Peak | 0.899 | 0.901 | 0.903 |
Quasi-static | 0.895 | 0.899 | 0.899 | |
MR8728 | Peak | 0.899 | 0.9 | 0.901 |
Quasi-static | 0.895 | 0.897 | 0.897 |
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Booker, J.D.; Lock, R.J.; Drury, D. Design and Physical Prototyping of a Novel Braking System for a Helicopter Rotor. Designs 2019, 3, 40. https://doi.org/10.3390/designs3030040
Booker JD, Lock RJ, Drury D. Design and Physical Prototyping of a Novel Braking System for a Helicopter Rotor. Designs. 2019; 3(3):40. https://doi.org/10.3390/designs3030040
Chicago/Turabian StyleBooker, Julian D., Richard J. Lock, and David Drury. 2019. "Design and Physical Prototyping of a Novel Braking System for a Helicopter Rotor" Designs 3, no. 3: 40. https://doi.org/10.3390/designs3030040