System and method for measuring a flowing property in a resin transfer molding system
Abstract
The present disclosure provides a system for measuring a permeability/porosity ratio of a fiber preform in a molding system. In some embodiments of the present disclosure, the system includes a mold, a detection device, a resin-supplying source, and a computing device. The mold includes an upper mold and a lower mold forming a mold cavity. The resin-supplying source is configured to input a molding resin into a preform in the mold cavity. The detection device is configured to detect a flow front of the molding resin at a first position and a second position in the mold cavity. The computing device is configured to calculate a flowing property of the molding resin into the preform based on the first position, the second position, a travelling time of the flow front from the first position to the second position, and a pressure difference driving the flow front to travel from the first position to the second position.
Claims
exact text as granted — not AI-modified1 . A measurement system, the measurement system comprising:
an upper mold and a lower mold, the upper mode and the lower mode forming a mold cavity; a resin-supplying source configured to input a molding resin into a preform in the mold cavity; a detection device configured to detect a flow front of the molding resin at a first position and a second position in the mold cavity; and a computing device configured to calculate a flowing property of the molding resin into the preform based on the first position, the second position, a travelling time of the flow front from the first position to the second position, and a pressure difference driving the flow front to travel from the first position to the second position.
2 . The measurement system of claim 1 , wherein the detection device is an image-capturing device configured to capture a first image and a second image of the flow front at the first position and the second position, respectively.
3 . The measurement system of claim 2 , wherein the upper mold is transparent, the image-capturing device is disposed over the upper mold, and the first image and the second image are captured through the upper mold.
4 . The measurement system of claim 1 , further comprising a vacuum pump coupled to an outlet port of the mold cavity.
5 . The measurement system of claim 1 , further comprising a front pressure sensor coupled to an inlet port of the mold cavity.
6 . The measurement system of claim 1 , further comprising a rear pressure sensor coupled to an outlet port of the mold cavity.
7 . (canceled)
8 . The measurement system of claim 1 , wherein the mold cavity does not contain a pressure sensor and the lower mold is free of having pressure sensors mounted therein.
9 . The measurement system of claim 1 , wherein the computing device is configured to calculate the flowing property of the molding resin based on the following expression:
K
%
φ
%
=
μ
G
P
0
(
t
n
-
t
n
-
1
)
∫
X
n
-
1
X
n
x
2
-
X
n
-
1
x
(
Gx
-
1
)
dx
where
K
%
φ
%
represents local ratios of permeability to porosity of the preform, t n-1 and t n represent a first timing and a second timing, x n and X n-1 represent the first position and the second position, P 0 represents the pressure difference, μ represents the viscosity of the molding resin,
K
n
φ
n
and
K
n
-
1
φ
n
-
1
represent global ratios of permeability to porosity of the preform, K 0/1 represents the permeability and ϕ 0/1 represents the porosity, wherein the local ratios refer to a ratio of permeability to porosity of a portion of the preform, and wherein G represents a constant term.
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