U.S. patent application number 13/743767 was filed with the patent office on 2014-01-02 for planking panel for a structural component, flow body comprising such a planking panel and device for monitoring material damage on such a planking panel.
The applicant listed for this patent is Airbus Operations GmbH. Invention is credited to Axel Siegfried Herrmann, Pierre Zahlen, Ichwan Zuardy.
Application Number | 20140000381 13/743767 |
Document ID | / |
Family ID | 45496539 |
Filed Date | 2014-01-02 |
United States Patent
Application |
20140000381 |
Kind Code |
A1 |
Zuardy; Ichwan ; et
al. |
January 2, 2014 |
PLANKING PANEL FOR A STRUCTURAL COMPONENT, FLOW BODY COMPRISING
SUCH A PLANKING PANEL AND DEVICE FOR MONITORING MATERIAL DAMAGE ON
SUCH A PLANKING PANEL
Abstract
The invention pertains to a planking panel (B) for a structural
component (1) that is realized in the form of a sandwich component
in its inner region (BI) that extends in a planar fashion and
features a first skin section (11), a second skin section (12) and
a core section (13) that is situated between these two skin
sections, wherein the core section (13) connects the first and the
second skin sections (11, 12) to one another in a planar fashion,
with the invention being characterized in that a plurality of
monitoring lines (14) is provided that extend over a planar section
of the core section (13) to be monitored in order to detect damage
in the core section (13) and respectively feature a first
connection point (15) on a first end (14a) and a second connection
point (16) on a second end (16a) in order to apply a monitoring
signal (UK), wherein the monitoring lines (14) have a tear strength
that lies in the range between 50% and 100% of the tear strength of
the core section (13).
Inventors: |
Zuardy; Ichwan; (Hamburg,
DE) ; Zahlen; Pierre; (Stade, DE) ; Herrmann;
Axel Siegfried; (Stade, DE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Airbus Operations GmbH |
Hamburg |
|
DE |
|
|
Family ID: |
45496539 |
Appl. No.: |
13/743767 |
Filed: |
January 17, 2013 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
PCT/EP2011/003644 |
Jul 20, 2011 |
|
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13743767 |
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Current U.S.
Class: |
73/802 |
Current CPC
Class: |
B32B 3/28 20130101; G01N
19/08 20130101; B32B 2607/00 20130101; B32B 2266/045 20130101; B64D
2045/0085 20130101; Y10T 428/24322 20150115; B32B 2307/54 20130101;
B32B 2266/0214 20130101; B32B 5/18 20130101; B32B 2605/18 20130101;
Y10T 428/249923 20150401; B64C 3/26 20130101; B32B 3/30 20130101;
B32B 2307/102 20130101; B32B 2307/5825 20130101; B64D 45/00
20130101; B32B 3/08 20130101; B32B 3/06 20130101; B32B 3/02
20130101; Y10T 428/239 20150115; B64C 3/20 20130101; B32B 7/04
20130101; Y10T 428/24 20150115; B64C 1/12 20130101; B32B 2266/04
20130101 |
Class at
Publication: |
73/802 |
International
Class: |
G01N 19/08 20060101
G01N019/08 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 20, 2010 |
DE |
10 2010 027 695.2 |
Jul 20, 2010 |
DE |
10 2010 027 696.0 |
Jul 20, 2010 |
DE |
10 2010 031 688.1 |
Jul 20, 2010 |
DE |
10 2010 031 690.3 |
Claims
1. A planking panel for a structural component that is realized in
the form of a sandwich component in its inner region that extends
in a planar fashion and features a first skin section, a second
skin section and a core section that is situated between these two
skin sections and connects the first and the second skin sections
to one another in a planar fashion, wherein the planking panel
features at least one monitoring line that is respectively coupled
to a first connection point and to a second connection point in
order to apply a monitoring signal and extends over a region of the
core section in order to detect damage in a monitoring volume of
the core section, wherein the monitoring line has a tear strength
that in terms of its amount lies in the range between 50% and 100%
of the amount of the fracture strength of the planar region of the
core section.
2. The planking panel according to claim 1, wherein the core
section has a tensile strength in the range between 1.5 MPa and 2.5
MPa and/or a shear strength in the range between 0.8 MPa and 1.6
MPa.
3. The planking panel according to claim 1, wherein at least one
monitoring line extends in the planking panel in a meander-shaped
fashion such that bridging segments extending along the thickness
direction of the planking panel and between the oppositely arranged
skin sections and reversing segments that respectively connect
these bridging segments and are respectively situated in one of the
oppositely arranged skin sections are formed.
4. The planking panel according to claim 3, wherein the connection
points of the at least one monitoring line are situated in
different skin sections.
5. The planking panel according to claim 3, wherein the connection
points of the at least one monitoring line are situated in one and
the same skin section of the skin sections.
6. The planking panel according to claim 1, wherein the planking
panel features a plurality of monitoring lines that extend along
the thickness direction of the planking panel, wherein each
monitoring line features two connection points, and wherein a first
connection point is respectively situated on the first skin section
and a second connection point is respectively situated on the
second skin section.
7. The planking panel according to claim 1, wherein the planking
panel features a plurality of monitoring lines that extend along
the longitudinal direction of the planking panel and each
monitoring line features two connection points, both of which are
situated on the first skin section or both of which are situated on
the second skin section.
8. The planking panel according to claim 1, wherein the monitoring
lines consist of electrical conductors, the connection points
consist of electrical connection points and the monitoring signal
consists of an electric monitoring voltage.
9. The planking panel according to claim 1, wherein the monitoring
lines consist of optical waveguides, the connection points consist
of optical connection points and the monitoring signal consists of
an optical monitoring signal.
10. The planking panel according to claim 1, wherein the core
section consists of a homogenous material that preferably is
specifically lighter than the two skin sections.
11. The planking panel according to claim 1, wherein the core
section consists of a foam core, particularly a polymer foam core,
an aluminum foam core, a ceramic core or a massive core.
12. The planking panel according claim 1, characterized in that the
core section consists of a composite core that is composed of
several sandwich cores.
13. The planking panel according to claim 1, characterized in that
the tear strength of the monitoring lines corresponds to a tensile
strength in the range between 1.5 MPa and 2.5 MPa and a shear
strength between 0.8 MPa and 1.6 MPa.
14. A flow body, particularly for an aircraft, with a planking
panel according to claim 1.
15. A device for monitoring material damage on a planking panel in
accordance with claim 1, wherein the monitoring device features an
activation device for transmitting a signal via the monitoring line
and an evaluation device, by means of which it can be determined if
the monitoring line is intact based on the signal transmitted via
the monitoring line in order to detect damage in the foam section,
wherein the activation device is designed in such a way that it
transmits the monitoring signal via the monitoring lines
permanently or within predefined time intervals.
Description
[0001] This patent application claims the filing date of German
patent applications DE 10 2010 027 696.0, DE 10 2010 027 695.2, DE
10 2010 031 688.1 and DE 10 2010 031 690.3 and of U.S. provisional
patent applications 61/365,857, 61/365,882, 61/365,873 and
61/365,863, all of which were filed on Jul. 20, 2010. Due to the
above reference, the disclosures of these patent applications are
incorporated into the present patent application.
[0002] The invention pertains to a planking panel for a structural
component that is realized in the form of a sandwich component in
its inner region that extends in a planar fashion and features a
first skin section, a second skin section and a core section
situated between these two skin sections, wherein the core section
connects the first and the second skin sections to one another in a
planar fashion, as well as to a flow body with such a planking
panel and a device for monitoring material damage on a planking
panel.
[0003] Planking panels of this type are known from the prior art
and used as covering components for the design of surfaces in
various branches of industry. Due to the simple structure, these
components make it possible to realize a large variety of different
surface shapes such that components of this type are suitable, for
example, for use as interior covering in vehicles. However, such
sandwich components have the disadvantage that the relatively soft
core section is susceptible to tearing under mechanical loads,
particularly impact loads. Since the core section is covered by
skin sections on both sides, it is difficult to determine if the
component is damaged without subjecting the component to
destructive testing.
[0004] Particularly in the field of manned aviation, the
operatability of the aircraft and therefore the structural
integrity of the components installed therein play an important
role. An undetectable critical damage of a safety-relevant
component can lead to the failure of various technical systems and
therefore have catastrophic consequences. In the aircraft industry,
safety-relevant components therefore are inspected, repaired and
possibly replaced if the damage can no longer be economically
repaired within predefined intervals, namely in accordance with a
maintenance schedule. The planking of an aircraft is continuously
subjected to possible collisions with other bodies during flying
operations. The aircraft is frequently hit by rocks, hailstones
during thunderstorms or even birds that get into the flight path of
the aircraft. The impact of such a foreign body or part thereof on
a planking element realized in the form of a sandwich structure
must be categorized is particularly critical because the
deformation, to which the sandwich element is subjected, can cause
the foam core in the interior to tear or to separate from the
surrounding skin sections without such damage being visible from
outside.
[0005] This is the reason why such sandwich components have so far
not been used as safety-relevant components of the planking in the
construction of aircraft, particularly in commercial aviation.
[0006] It is the objective of the invention to disclose a planking
panel for a structural component with the lowest weight possible, a
flow body with such a planking panel and a device for monitoring
material damage on a planking panel that can be used for the
main-load bearing region of a safety-critical component
structure.
[0007] This objective is attained with the characteristics of the
independent claims. Other embodiments are disclosed in the
dependent claims that refer to these independent claims.
[0008] The inventive solutions allow the non-destructive testing
(Non Destructive Testing) of a planking panel and, in particular,
the reliable detection of all types of damages.
[0009] According to the inventive solution of a planking panel, it
is proposed to form the core section of a planking panel realized
in the form of a sandwich structure of foam material and to utilize
this planking panel in a main-load bearing region of the aircraft
structure despite its susceptibility. However, the integrity of the
material of the core section (structural integrity) is checked by
means of at least one monitoring line with a tear strength that in
terms of its amount is lower than the fracture strength of the
planar region of the core section such that damage in the core
section can be detected in a non-destructive, simple and reliable
fashion. In this way, the planking panel can be used as
damage-tolerant planking panel such that it is suitable, in
particular, for use as part of an aircraft structure.
[0010] The term main-load bearing region refers to a region of the
aircraft structure, the damage of which can lead to a catastrophic
event for the aircraft during the flight if the damage occurs in
such a way that this region is no longer able to withstand tensions
resulting from the main loads being applied to the aircraft
structure.
[0011] The invention proposes a planking panel for a structural
component that is realized in the form of a sandwich component in
its inner region that extends in a planar fashion and features a
first skin section, a second skin section and a core section that
is situated between these two skin sections and connects the first
and the second skin sections to one another in a planar fashion. In
order to detect damages in a fictitious monitoring volume of the
core section that is respectively monitored with respect to the
presence of damage, at least one monitoring line is provided in
this monitoring volume or a plurality of monitoring lines extending
over the monitoring volume of the core section to be monitored is
provided. Depending on the respective application, the monitoring
line or the monitoring lines is/are arranged in the monitoring
volume in such a way that damage monitoring of the monitoring
volume can be realized. Each monitoring line may respectively
feature a first connection point at a first end and a second
connection point at a second end in order to apply a monitoring
signal. Alternatively, one connection point may be coupled to
several monitoring lines. In this case, the monitoring lines have a
tear strength that lies, in particular, in the range between 50%
and 100% of the tear strength of the core section.
[0012] Such an arrangement provides the advantage that defects in
the core section of the planking panel can be detected immediately
after they occur and a defective component can be very quickly
identified as such in order to be subsequently replaced.
[0013] In another embodiment of the invention, the tear strength of
the monitoring lines lies in the range between 80% and 100% of the
tear strength of the core section, but it is particularly referred
that the tear strength of the monitoring lines lies in the range
between 90% and 100% or 90% and 95% of the tear strength of the
core section.
[0014] Furthermore, the core section may have a tensile strength in
the range between 1.5 MPa and 2.5 MPa and/or a shear strength in
the range between 0.8 MPa and 1.6 MPa.
[0015] According to an embodiment of the invention, it is proposed
that at least one monitoring line within the monitoring volume
extends in the planking panel in a meander-shaped fashion such that
bridging segments extending along the thickness direction of the
planking panel and between the oppositely arranged skin sections
and reversing segments that respectively connect these bridging
segments and are respectively situated in one of the oppositely
arranged skin sections are formed, wherein reversing segments that
lie behind one another in the longitudinal direction of the
monitoring line are situated in different skin sections. In this
case, the connection points of the at least one monitoring line may
be situated in different skin sections or in one and the same skin
section.
[0016] Furthermore, a plurality of monitoring lines may extend in a
thickness direction of the planking panel, wherein each monitoring
line features two connection points, and wherein a first connection
point is situated on the first skin section and a second connection
point is situated on the second skin section.
[0017] Due to this arrangement, the formation of tears in the core
section that extend transverse to the thickness direction can be
detected in a particularly simple fashion.
[0018] According to an embodiment of the invention, each monitoring
line features two connection points. According to another
embodiment, at least one connection point is provided and coupled
to several monitoring lines.
[0019] In another embodiment of the present invention, a plurality
of monitoring lines may extend in a longitudinal direction of the
planking panel, wherein each monitoring line features two
connection points, both of which are situated on the first skin
section or both of which are situated on the second skin
section.
[0020] Due to this arrangement, the formation of tears in the core
section that extend along the thickness direction and therefore
transverse to the longitudinal direction of the planking panel can
be detected in a particularly simple fashion.
[0021] Furthermore, the monitoring lines may consist of electrical
conductors, the connection points may consist of electrical
connection points and the monitoring signal may be an electric
monitoring voltage signal.
[0022] This provides the advantage that the monitoring voltage can
be respectively applied to one electrical conductor. If a current
flow does not takes place in the conductor or deviates from a
predefined current value, it can be determined that the conductor
and therefore also the core section is damaged.
[0023] The monitoring lines may furthermore and/or additionally
consist of optical waveguides, the connection points may consist of
optical connection points and the monitoring signal may be an
optical monitoring signal.
[0024] The utilization of optical waveguides as monitoring lines
provides the advantage that, in contrast to electrical conductors,
no interference signals originating, for example, from magnetic
fields are induced such that the damage detection can also be
reliably carried out in magnetic fields. This is particularly
advantageous when the aircraft flies through a thunderstorm, in
which lightning strikes that generate magnetic fields occur.
[0025] Furthermore, the monitoring signal may be permanently
applied to the monitoring lines or the monitoring signal may be
applied to the monitoring lines for a predefined time period within
predefined time intervals.
[0026] The first variation provides the advantage that damage can
be immediately detected. If a monitoring signal is permanently
applied, a line interruption leads to an immediate signal loss and
therefore to an intermediate defect detection. The second
alternative provides the advantage of a consistent inspection
activity for maintenance personnel in terms of conduct such that
the maintenance activities can be more precisely defined and
optimized. Furthermore, a measurement in the dormant state is in
most instances more reliable than in the operating state.
[0027] According to an inventive embodiment, the core section of
the planking panel is formed of a homogenous material.
[0028] Furthermore, the core section may consist or be formed of a
foam core and, in particular, an aluminum foam core, a ceramic core
or a sandwich core. According to another embodiment, the core
section itself features an intermediate layer and/or is realized in
the form of a composite core that is composed of several sandwich
cores.
[0029] Furthermore, the tear strength of the monitoring lines may
correspond to a tensile strength in the range between 1.5 MPa and
2.5 MPa and a shear strength between 0.8 MPa and 1.6 MPa.
[0030] Another aspect of the present invention concerns a flow
body, particularly for an aircraft, with a planking panel.
[0031] According to another exemplary embodiment, a device for
monitoring material or structural damage on a planking panel is
proposed, wherein the monitoring device features an activation
device for transmitting a signal via the monitoring line and an
evaluation device, by means of which it can be determined if the
monitoring line is intact based on the signal transmitted via the
monitoring line in order to detect damage in the foam section,
wherein the activation device is designed in such a way that it
transmits the monitoring signal via the monitoring lines
permanently or within predefined time intervals.
[0032] Exemplary embodiments of the invention are described below
with reference to the attached schematic figures, in which:
[0033] FIG. 1 shows a top view of a section of an aircraft tail
unit with an inventive planking panel,
[0034] FIG. 2 shows a partial section through an inventive planking
panel according to a first embodiment of the invention, in which
the planking panel features a monitoring line extending in the
longitudinal direction of the core section in order to detect
damage in a monitoring volume of the core section,
[0035] FIG. 3 shows a partial section through an inventive planking
panel according to another embodiment of the invention, in which
the planking panel features a monitoring line that extends in the
core layer in a meander-shaped fashion, wherein the connection
devices coupled to this monitoring line are respectively provided
on different skin sections,
[0036] FIG. 4 shows a partial section through an inventive planking
panel according to another embodiment of the invention, in which
the planking panel features a monitoring line that extends in the
core layer in a meander-shaped fashion, wherein the connection
devices coupled to this monitoring line are respectively provided
on the same skin section,
[0037] FIG. 5 shows a partial section through an inventive planking
panel with several variations of the arrangement of the monitoring
lines,
[0038] FIG. 6 shows a partial section through an inventive planking
panel according to a second embodiment, and
[0039] FIG. 7 shows another partial section through an inventive
planking panel.
[0040] FIG. 1 shows a structural component 1 with a plurality of
inventive planking panels B that at least partially form a surface
of the structural component 1. The structural component 1 may
comprise a flow body 1 such as, for example, a tail unit of an
aircraft, particularly an aircraft wing, an elevator, a rudder or a
part of the aircraft fuselage.
[0041] A coordinate system is illustrated for orientation purposes
and respectively defines a chord direction T, a wingspan direction
S and a thickness direction D of the aircraft wing or the
structural component and therefore of the planking panel B.
[0042] This coordinate system is also illustrated in FIG. 2 that
shows a collision of a foreign body F with the planking element B.
FIG. 2 shows a partial section along a line of section that extends
in a plane defined by the thickness direction D and the wingspan
direction S in FIG. 1. The planking element B features a first skin
section 11 in its upper region referred to the thickness direction
D and a second skin section 12 in its oppositely arranged lower
region referred to the thickness direction D. The skin sections 11,
12 have a small thickness in comparison with their lateral
dimensions and therefore form planar, panel-shaped bodies. A core
layer 13 provided between the first skin section 11 and the second
skin section 12 has a greater thickness than the skin sections 11,
12. On its upper surface, the core layer 13 is in planar contact
with the first skin layer 11. The core layer 13 is furthermore in
planar contact with the second skin layer 12 on its lower surface.
The planar contact can be additionally intensified, for example, by
providing an adhesive between the core layer and the skin layer or
by producing screwed or riveted connections. According to FIG. 1,
the planking panels B feature an inner region IB, in which the
monitoring lines 14 extend.
[0043] In the first embodiment of the invention illustrated in FIG.
2, a monitoring line 14 extends through the core layer 13 of the
planking panel B in a longitudinal direction of the planking panels
B. The monitoring line 14 has a first end 14a and a second end 14b,
wherein the first end 14a is connected to a first connection point
15 and the second end 16a is connected to a second connection point
16. Both connection points 15, 16 are arranged in the first skin
layer 11, but could also be arranged in the second skin layer 12 in
an alternative embodiment of the invention. A monitoring signal can
be externally applied to the monitoring line 14 via the connection
points 15, 16, wherein the monitoring signal is transmitted from
the first connection point 15 to the second connection point 16 or
vice versa.
[0044] The monitoring lines 14 used may consist of electrical
conductors or optical waveguides such as, for example, fiber optic
cables. A monitoring signal corresponding to these lines then needs
to be applied in the form of an electrical or optical signal. An
external diagnostic system or an internal diagnostic system
arranged in the planking panel B determines if the applied signal
is transmitted via the monitoring line 14. The utilization of
electrical conductors makes it possible to manufacture particularly
cost-efficient planking elements B, wherein the high robustness of
the electrical conductors reduces the effort for the manufacturing
process of the planking panels B. The utilization of optical
monitoring lines provides the advantage that the planking panels B
are insensitive to electromagnetic interferences.
[0045] FIG. 7 shows a first embodiment of the invention, wherein
this figure shows an exemplary tear R formed as a result of the
impact of the foreign body F according to FIG. 2. This impact leads
to a deflection of the entire planking panel B, wherein the core
section 13 in the interior of the panel is subjected to a tensile
stress that acts in its longitudinal direction. The core section 13
tears if this tensile stress exceeds a maximum material value such
that the tear shown is formed. The monitoring line 14 extends along
the longitudinal direction of the planking panel B and has a tear
strength that is essentially identical to the tear strength of the
material of the core section 13. This means that tearing of the
core section 13 directly leads to an interruption of the monitoring
line 14. A signal transmission therefore cannot take place and the
diagnostic device detects a defect. In FIG. 7, a monitoring voltage
Uk is applied to the monitoring lines 14 at the connection points
15, 16 such that a monitoring signal in the form of a predefined
current intensity flows through the monitoring line 14.
[0046] However, a signal transmission does not have to completely
fail in order to detect damage. In an alternative embodiment of the
invention, a monitoring signal may be applied in the form of an
electric voltage UK that generates a current flow with a predefined
current value in the monitoring line 14. If the diagnostic device
measures a current flow with the predefined current value, it is
determined that no damage exists. However, if a current value is
detected that deviates from the predefined current value, it is
determined that the planking panel B is damaged. This embodiment
naturally can be combined with the embodiment, in which only the
current value "zero" defines a damage scenario.
[0047] The monitoring signal may flow through the monitoring line
14 permanently or in a pulsed fashion. When the monitoring line 14
is interrupted, a signal transmission no longer takes place
beginning at the time of its interruption, wherein this is
immediately detected by the diagnostic device that simultaneously
also outputs the monitoring signal. In a pulsed signal application,
the diagnostic device determines that damage exists on the planking
panel B by means of the first signal that is applied to the
monitoring line 14 after a damage scenario and cannot be
transmitted. In this way, energy can be saved in comparison with a
permanent signal transmission.
[0048] The monitoring lines 14 have a tear strength that is adapted
to the material properties of the core section 13. In this respect,
the tear strength lies in the range between 50% and 100%,
preferably between 80% and 100%, particularly between 90% and 100%,
of the tear strength of the material of the core section 13. This
makes it possible to ensure that the monitoring line 14 is also
destroyed when the core section 13 suffers damage in the form of a
tear. In another preferred embodiment of the present invention, the
tear strength of the monitoring line 14 lies in the range between
80% and 95% of the tear strength of the material of the core
section 13. This embodiment provides the advantage that the
monitoring line 14 is also severed in the corresponding region even
if the core section 13 was not yet damaged, but rather merely
subjected to a load that lies in the fringe load range of its
material, wherein the diagnostic system consequently detects that
the planking panel B was at least subjected to a load in the fringe
range. Subsequently, the diagnostic device can output a warning
message in advance such that the planking panel B can be replaced
before an actual damage scenario occurs.
[0049] The tear strength of the monitoring lines 14 preferably
corresponds to a tensile strength that lies between 1.5 MPa and 2.5
MPa, but preferably amounts, in particular, to 1.9 MPa, and/or a
shear strength that lies between 0.8 MPa and 1.6 MPa, but
preferably amounts to 1.15 MPa.
[0050] FIG. 5 shows several variations of the arrangement of the
monitoring lines 14, wherein the connection points 15, 16 of the
monitoring lines 14 do not necessarily have to be provided on the
same skin section. The monitoring lines 14 may extend from a first
skin section 11 to a second skin section 12 essentially parallel to
the thickness direction D. The skin sections 11, 12 may
alternatively or additionally also be arranged vertically such that
the monitoring lines 14 extend essentially parallel to the chord
direction T. FIG. 5 furthermore shows an exemplary tear R that
conceivably could be formed after the impact of a foreign body F as
illustrated in FIG. 1. The tear intersects with at least one of the
monitoring lines 14 such that a signal transmission is no longer
possible along these severed monitoring lines 14.
[0051] FIG. 6 shows another embodiment of the present invention,
wherein the structure of the planking panel B in the form of a
sandwich component is identical to that described with reference to
FIG. 1. However, the monitoring lines 14 extend from the first skin
section 11 to the second skin section 12 and are provided at
predefined critical points K of the planking panel B in this case.
A tear shown extends essentially parallel to the skin sections 11,
12 and therefore transverse to the monitoring lines 14. A foreign
body F that laterally impacts on the planking panel B generates an
impulse that is illustrated in the form of the vectors FK and leads
to a compression of the planking panel B. The effective force
causes the skin sections 11, 12 to deflect, namely away from the
core section 13, such that the tear R shown is formed. In this
case, the tear R also severs the monitoring lines 14 such that the
monitoring signals can no longer be transmitted and the diagnostic
device determines that the planking panel has been damaged.
[0052] The monitoring lines or arrangement of monitoring lines
provided in the monitoring volume KV in accordance with the
invention may extend differently within the monitoring volume VK.
FIG. 3 shows a preferred embodiment of the invention, in which the
planking panel B features a monitoring line 14 that extends in the
core layer or the core section 13 in a meander-shaped fashion,
wherein the connection devices 15, 16 coupled to this monitoring
line 14 are respectively provided on different skin sections 11 and
12. FIG. 4 shows a variation of this embodiment, in which the
planking panel B features a monitoring line 14 that extends in the
core layer or the core section 13 in a meander shaped fashion,
wherein the connection devices 15, 16 coupled to this monitoring
line 14 are respectively provided on the same skin section 11 or
12.
* * * * *