Dynamic resonance system and method for the anti-icing and de-icing of inlet grids

Patent metadata

Field	Value
Publication number	US-9737916-B2
Application number	US-201514833306-A
Country	US
Kind code	B2
Filing date	Aug 24, 2015
Priority date	Aug 24, 2015
Publication date	Aug 22, 2017
Grant date	Aug 22, 2017

Abstract

In one embodiment, a system includes an inlet grid configured to reduce distortion of an incoming airflow. The system may also include a vibration device coupled to the inlet grid and a controller communicatively coupled to the vibration device. The controller may transmit a vibration signal to the vibration device causing the vibration device to vibrate the inlet grid such that the inlet grid resonates at a natural frequency inducing a mode shape in the inlet grid. The mode shape may break up and prevent ice on the inlet grid.

First claim

What is claimed is:

1. A method, comprising:
detecting, using a controller, an atmospheric condition sufficient for accumulation of ice on an inlet grid, the inlet grid configured to reduce distortion of an airflow passing through the inlet grid;
transmitting, using the controller, a first vibration signal to a first vibration device and a second vibration signal to a second vibration device, the first and second vibration devices coupled to the inlet grid;
resonating, by the first vibration device in response to the first vibration signal, the inlet grid at a first natural frequency of the inlet grid, thereby inducing a first mode shape in the inlet grid;
resonating, by the second vibration device in response to the second vibration signal, the inlet grid at a second natural frequency of the inlet grid, thereby inducing a second mode shape in the inlet grid;
wherein the first and second mode shapes superimpose at one or more anti-nodes of the inlet grid to break up and prevent ice on the inlet grid.

2. The method of claim 1 , wherein the first vibration device has a first excitation direction and the second vibration device has a second excitation direction.

3. The method of claim 1 , wherein the first and second vibration devices are selected from the group comprising a piezoelectric shaker and a hydraulically powered shaker.

4. The method of claim 1 , wherein the first and second vibration devices comprise an electromagnetic shaker.

5. The method of claim 1 , wherein the controller stops transmitting the first and second vibration signals to the first and second vibration devices in response to determining that the atmospheric condition sufficient for ice accumulation are no longer present.

6. A non-transitory computer readable storage medium comprising logic, the logic operable, when executed by the processor to:
detect an atmospheric condition sufficient for an accumulation of ice on an inlet grid, the inlet grid configured to reduce distortion of airflow through the inlet grid;
transmit a first vibration signal to a first vibration device and a second vibration signal to a second vibration device, the first and second vibration devices coupled to the inlet grid;
resonate, by the first vibration device in response to the first vibration signal, the inlet grid at a first natural frequency of the inlet grid, thereby inducing a first mode shape in the inlet grid; and
resonate, by the second vibration device in response to the second vibration signal, the inlet grid at a second natural frequency of the inlet grid, thereby inducing a second mode shape in the inlet grid; the first and the second mode shapes superimpose at one or more anti-nodes of the inlet grid to break up and prevent ice on the inlet grid.

7. The non-transitory medium of claim 6 , wherein the first vibration device has a first excitation direction and the second vibration device has a second excitation direction.

8. The non-transitory medium of claim 6 , wherein the first and second vibration devices are selected from the group consisting of a piezoelectric shaker, a hydraulically powered shaker, and an electromagnetic shaker.

9. The non-transitory medium of claim 6 , wherein the logic is further operable, when executed by a processor to to:
detect an increased mass or stiffness of the inlet grid due to an accumulation of ice; and
modify the first vibration signal transmitted to the first vibration device to compensate for the change in natural frequency due to the increase in mass or stiffness.

Assignees

• Schneider William
• Wood Yvette
• Peduchi Andrew
• Lockheed Corp

Inventors

• Schneider William
• Wood Yvette
• Peduchi Andrew

Classifications

• F05D2270/62

  Electrical actuators · CPC title

• B64D2033/0233

  comprising de-icing means · CPC title

• F05D2260/96

  Preventing, counteracting or reducing vibration or noise · CPC title

• F02C7/04

  Air intakes for gas-turbine plants or jet-propulsion plants · CPC title

• F02C7/055

  with intake grids, screens or guards · CPC title