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Feature Selection for Helicopter Swashplate Bearing Fault Diagnosis

Volume 3: Manufacturing Equipment and Systems, 2017
This paper provides a case study of diagnosing helicopter swashplate ball bearing faults using vibration signals. We develop and apply feature extraction and selection techniques in the time, frequency, and joint time-frequency domains to differentiate six types of swashplate bearing conditions: low-time, to-be-overhauled, corroded, cage-popping ...
Yong Wang, Lin Li
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Vibration Analysis of the Load on Helicopter Swashplate Rod

Applied Mechanics and Materials, 2012
The swashplate rod is a key component of helicopter control system. The vibration environment of helicopter is quite complex. The natural frequency of the swashplate rod is generally low. So resonance occurs easily. Resonance could reduce control precision or even damage the whole control system. Established dynamic and mathematical model of swashplate
Fang Wang, Ming Chen
exaly   +2 more sources

The Dynamics of the Swashplate Mechanism of a VTOL Unmanned Aerial Vehicle

Multibody System Dynamics, 2001
Jorge Angeles
exaly   +2 more sources

A Novel Comprehensive Kinematic and Inverse Dynamic Model for the Flybar-Less Swashplate Mechanism: Application on a Small-Scale Unmanned Helicopter

Symmetry, 2020
In this paper, we propose a novel kinematic and inverse dynamic model for the flybar-less (FBL) swashplate mechanism of a small-scale unmanned helicopter. The swashplate mechanism is an essential configuration of helicopter flight control systems.
Yongming Yao
exaly   +2 more sources

Fatigue Life Improvement of the Roller Swashplate Bearing of an Axial Swashplate Type Piston Pump

ASME/BATH 2014 Symposium on Fluid Power and Motion Control, 2014
The roller swashplate bearing in hydraulic piston pumps is very unique in applications of roller element bearings. The main advantages of this type of bearings are low friction, very small difference between start torque and steady state torque, and no additional pressure source is required for their functioning.
Hongliu Du, David J. Carlson
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Torque on the Swashplate of an Axial Piston Pump

Journal of Dynamic Systems, Measurement, and Control, 1985
As part of a study involving methods of control of an axial piston pump, it is required to obtain linear or linearized equations of motion of the system’s states. The torque imposed on the plate by the pumping action of the pistons is the most important term in the equation of motion of the swashplate.
G. Zeiger, A. Akers
openaire   +1 more source

Calculating Method for the Leakage between Slipper and Swashplate in Spherical Swashplate Type Axial Piston Pump with Conical Cylinder

Advanced Materials Research, 2013
This paper takes the piston that has tapered rotor spherical axial swashplate as the research object, aiming to develop research of calculation of slipping shoe and the swashplate of the lubrication circular leakage. First , analyzing the structure of piston pump that is characterized by slipping shoe static pressure lubrication, Based on the continuum
Yong Qin Chen, Yang Shun Wang
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AH-64D Swashplate Test Stands: Improving Understanding of Component Behavior in Rotorcraft Swashplates through External Sensors

Proceedings of the Vertical Flight Society Airworthiness, CBM and HUMS Specialists Meeting - Huntsville, Alabama 2013, 2013
This paper discusses the research activities and capabilities at the University of South Carolina going through the theory behind the design of a test stand, laying out the specifications of the two test stands currently in operation, the tail rotor drive train (TRDT) and the main rotor swashplate (MRSP), and then ending with the an example of new ...
Travis Edwards, Thomas Hartmann, Andrew Patterson, Samuel Bernstel, Joshua Tarbutton, Abdel Bayoumi, Damian Carr, Les Eisner   +7 more
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A fault-tolerant approach to helicopter swashplate control

Journal of Guidance, Control, and Dynamics, 1985
A novel method for controlling the orientation of a helicopter swashplate is developed from basic principles and evaluated by simulation. The method applies to rise-and-fall swashplates which are controlled by redundant actuators for the purpose of achieving survivability and fault-tolerance.
Bruce K. Walker, Eliezer Gai, Mukund N. Desai   +2 more
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CH-47 Helicopter Swashplate Test Stand

Proceedings of the AHS International 68th Annual Forum and Technology Display, 2012
A complex multi-axis rotating test system for the CH-47 forward and aft swashplates was designed and built for the Army Redstone Test Center (RTC), with the assistance of the University of Dayton Research Institute (UDRI). This equipment was developed to give the Army the ability to test CH-47 swashplate bearings and new swashplate designs. It has also
Daniel Bowman, Steve Fuchs, Bryan Thompson   +2 more
openaire   +1 more source