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Wireless HUMS nodes wake up by tachometer

IP.com Disclosure Number: IPCOM000240685D
Publication Date: 2015-Feb-18
Document File: 5 page(s) / 256K

Publishing Venue

The IP.com Prior Art Database

Related People

Jan Beran: INVENTOR [+4]

Abstract

In rotorcraft, health and usage monitoring system (HUMS) diagnoses the health of critical components during flight for safe vehicle operation. HUMS detects any progressive defect and suggest maintenance before it leads to failure of a rotating component. This increases the vehicle safety, reliability and performance and also reduces the maintenance cost. The sensors such as tachometers and accelerometers are placed in close proximity to rotating blades to sense vibration/performance. The sensor-generated data is sent to a memory unit in HUMS over a wired communication. The problem associated with wired communication is that it increases the weight and cost of the system. Hence, wireless communication between sensors and HUMS is preferable over wired communication. The wireless communication has an additional set of drawbacks such as wake up of wireless nodes as the engine or rotor starts. The proposed method and system deal with a novel way to turn on the wireless nodes by using a tachometer. The tachometer harvests energy from the rotor and converts it into electrical energy to power the wireless nodes.

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Wireless HUMS nodes wake up by tachometer

Jan Beran, Patrik Moravek, David Kubat and Karel Adamek ABSTRACT

In rotorcraft, health and usage monitoring system (HUMS)diagnoses the health of critical components during flight for safe vehicle operation. HUMS detects any progressive defect and suggest maintenance before it leads to failure of a rotating component. This increases the vehicle safety, reliability and performance and also reduces the maintenance cost. The sensors such as tachometers and accelerometers are placed in close proximity to rotating blades to sense vibration/performance. The sensor-generated data is sent to a memory unit in HUMS over a wired communication. The problem associated with wired communication is that it increases the weight and cost of the system. Hence, wireless communication between sensors and HUMS is preferable over wired communication. The wireless communication has an additional set of drawbacks such as wake up of wireless nodes as the engine or rotor starts. The proposed method and system deal with a novel way to turn on the wireless nodes by using a tachometer. The tachometer harvests energy from the rotor and converts it into electrical energy to power the wireless nodes.


1. Introduction

The unequal lift produced by the main rotor blades or unequal distribution of mass in rotor blade is a main cause of vibration in rotorcraft. Excess vibration in the rotorcraft can lead to premature wear and sometimes leads to failure of rotating components. Health and Usage Monitoring System (HUMS) measures vibration for detection of any progressive defects in critical components and also suggest possible corrective action. A typical on-board HUMS application includes monitoring of transmission and engine vibration, rotor tracking and balancing, shaft balancing, gear box monitoring and rolling

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bearing monitoring. Additionally it checks the vehicle health status after each flight. Early detection and rectification of defects in time helps to increase the operational safety of the vehicle. Furthermore it reduces the maintenance cost and fuel consumption and improves the vehicle performance and reliability.

HUMS comprises a number of sensors such as tachometers and accelerometers and data acquisition systems. The sensors are placed in close proximity to critical components such as rotor blades and drive shafts to sense the performance of the components and data acquisition system collects the data and stores in the storage device. Later, the data is off loaded from storage device to analyze the performance of these components after flight. The components scheduled for maintenance, in case any discrepancy in the data of the component, is noticed which improves the safety of the vehicle. These sensors are connected to HUMS with connectors and wires, which increase the weight, installation time and cost of the HUMS.

The abovementioned problem can be overcome by using a wireless interface between the...