Device for analyzing dynamic characteristics of carbon composite material based on test temperature, orientation of carbon material, and external loading pattern applied thereto, and dynamic characteristics analysis method using the same

Patent metadata

Field	Value
Publication number	US-11656162-B2
Application number	US-202017136623-A
Country	US
Kind code	B2
Filing date	Dec 29, 2020
Priority date	Oct 8, 2020
Publication date	May 23, 2023
Grant date	May 23, 2023

Abstract

Disclosed is a device for analyzing dynamic characteristics of a carbon composite material based on a test temperature, an orientation of a carbon material, and an external loading pattern applied thereto. The device includes a sensitivity analyzer configured to calculate a frequency response function of the carbon composite material based on a physical force signal and a vibration signal; and calculate a sensitivity of the carbon composite material to each of variations in the test temperature, an orientation of a carbon material contained in the carbon composite material, and the external loading pattern applied thereto, based on the calculated frequency response function.

First claim

What is claimed is:

1. A device for analyzing dynamic characteristics of a carbon composite material based on a test temperature, an orientation of a carbon material, and an external loading pattern applied thereto, the device comprising:
a thermostat configured to set a test temperature under control of a sensitivity analyzer and to maintain a test temperature in a test space at the set temperature;
a vibration exciter configured to set an external loading pattern under control of the sensitivity analyzer and to apply a physical force to a carbon composite material as a test target located in the test space, based on the set external loading pattern;
a first sensor for measuring a physical force applied to the carbon composite material from the vibration exciter;
a second sensor in contact with one side of the carbon composite material for collecting vibration of the carbon composite material caused by the physical force; and
a sensitivity analyzer configured to:
control the thermostat to set the test temperature in the test space, and control the vibration exciter to set the external loading pattern;
calculate a frequency response function of the carbon composite material based on a physical force signal measured by the first sensor and a vibration signal collected by the second sensor; and
calculate a sensitivity of the carbon composite material to each of variations in the test temperature, an orientation of a carbon material contained in the carbon composite material, and the external loading pattern applied thereto, based on the calculated frequency response function.

2. The device of claim 1 , wherein the carbon composite material as the test target includes carbon fiber reinforced plastic (CFRP) containing a carbon fiber having a single orientation at a specific angle, wherein the orientation of the carbon material includes an orientation of the carbon fiber.

3. The device of claim 1 , wherein the vibration exciter applies the physical force based on at least two external loading patterns, wherein the at least two external loading patterns include a random pattern and a harmonic pattern.

4. The device of claim 1 , wherein the first sensor includes a load sensor positioned between the vibration exciter and the carbon composite material to measure the physical force.

5. The device of claim 1 , wherein the second sensor includes an acceleration sensor, wherein the second sensor includes a plurality of second sensors to collect vibrations at a plurality of positions on the carbon composite material.

6. The device of claim 1 , wherein a modal damping coefficient of the frequency response function is based on the test temperature, the external loading pattern, and the orientation of the carbon material, wherein a resonance frequency of the frequency response function is based on the test temperature and the orientation of the carbon material.

7. The device of claim 6 , wherein the sensitivity analyzer is further configured to calculate the frequency response function based on an average value of values respectively measured by the plurality of second sensors and based on a value measured by the first sensor.

8. The device of claim 7 , wherein the sensitivity analyzer is further configured to calculate the frequency response function using a following Equation 1:

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Assignees

• Pukyoug National Univ Industry Univ Cooperation Foundation
• Nat Univ Pukyong Ind Univ Coop Found

Inventors

• Kim Chan Jung

Classifications

• G01N2203/0688

  Time or frequency · CPC title

• G01N2203/0222

  Temperature · CPC title

• G01N2203/0005

  Repeated or cyclic · CPC title

• B29C70/22

  oriented in at least two directions forming a two-dimensional [2D] structure · CPC title

• G01N2203/0694

  Temperature · CPC title