Testing device for verifying instantaneous damage safety of windshield glass and testing method thereof

Abstract

The invention discloses a test device for verifying the instantaneous damage safety of windshield glass and a test method thereof, relates to the technical field of aircraft windshield glass, and solves the problem that the conventional damage safety test device can not only meet the pressurization requirement of the windshield glass but also give consideration to the safety of test personnel. And the instantaneous damage examination of the windshield glass is difficult to realize. Comprising a pressurization cavity and a damage control device, a test piece installation port is formed in one side of the pressurization cavity, a windshield test piece is connected to the test piece installation port in a sealed mode, a plurality of cavity function holes are formed in the periphery of the pressurization cavity, and internal pressurization and / or pressure relief and / or pressure monitoring are / is conducted on the pressurization cavity through the cavity function holes; the damage control device is located on the outer side of the windshield test piece and carries out instantaneous impact work on the windshield test piece. According to the invention, safety verification under the condition of instantaneous damage of the windshield can be realized, and the effect of safety verification under the condition of instantaneous damage of the windshield is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of windshields for aircraft and aircraft, and in particular to a test device and a test method for verifying the instantaneous breakage safety of a windshield. Background Art

[0002] In the aviation field, flight safety is always the top priority, and the windshield is an important protective and visual protection component of the aircraft, so its safety cannot be ignored. The aircraft windshield must not only withstand conventional factors such as aerodynamic pressure and temperature changes during flight, but also withstand emergencies such as bird strikes and foreign object impacts. In some cases, the structural layer of the windshield will be damaged instantly, which may lead to serious flight accidents. Therefore, aircraft windshields usually have damage safety design requirements, that is, when the structural layer is suddenly damaged, the remaining structure of the windshield should be sufficient to support the aircraft to return.

[0003] Therefore, in the design process of the windshield, it is necessary to verify the structural safety of the windshield after instantaneous damage through testing. Since the windshield has certain air pressure requirements in the cabin when it is actually used, the traditional damage safety test device is difficult to take into account the safety of the test personnel, meet the windshield pressurization requirements, and achieve the requirements of instantaneous damage assessment of the windshield. Therefore, a new test device is urgently needed to verify the safety of the windshield under instantaneous damage. Summary of the invention

[0004] The purpose of the present invention is to provide a test device for verifying the safety of windshield glass in the event of instantaneous breakage, which can verify the safety of windshield glass in the event of instantaneous breakage and ensure the safety of operators.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: A test device for verifying the instantaneous damage safety of a windshield comprises a pressurization cavity and a damage control device, wherein a test piece installation port is provided on one side of the pressurization cavity, the test piece installation port is sealed and connected to the windshield test piece, a plurality of cavity function holes are provided on the periphery of the pressurization cavity, and internal pressurization and / or pressure relief and / or pressure monitoring are performed on the pressurization cavity through the cavity function holes; the damage control device is located on the outside of the windshield test piece and performs instantaneous impact on the windshield test piece.

[0006] Furthermore, the damage control device comprises a damage control cylinder, and an output end of the damage control cylinder is aligned with the windshield test piece.

[0007] Furthermore, a sharp impact head is provided at the output end of the damage control cylinder.

[0008] Furthermore, a drill bit is provided at the output end of the damage control cylinder.

[0009] Furthermore, the damage control device is installed on a device connecting bracket, and the device connecting bracket is connected to the outside of the boost chamber.

[0010] Furthermore, the pressurized cavity includes a through hole at a side away from the test piece mounting port and a cavity bottom connecting plate at the position of the through hole, and the cavity bottom connecting plate is sealingly connected to the pressurized cavity.

[0011] Furthermore, the windshield test piece is connected to the test piece mounting port via a fastener.

[0012] Furthermore, the test piece installation port is sealed by the windshield test piece body, or a sealant layer is provided between the two to achieve sealing.

[0013] The present invention also discloses a test method for verifying the instantaneous damage safety of a windshield, comprising the following steps: The pressurized cavity is gradually pressed to make its internal pressure reach P1=△Pt+△Pa, where △Pt is the maximum setting value of the aircraft pressure relief valve and △Pa is the aircraft cabin pneumatic negative pressure; According to the requirements of the damaged part of the windshield to be verified, set the stroke of the damage control device to break the glass, and ensure accurate positioning to the damaged part of the windshield to achieve instantaneous damage to the windshield test piece; Perform pressure compensation inside the booster cavity to make its internal pressure reach P2 = n × (△Pt + △Pa), where n is the load amplification factor, which is determined according to the material of the windshield; and start to maintain pressure, and the pressure maintenance time is determined according to the flight time of the verification product; The pressure inside the boost chamber is monitored, and the state of the test piece and the pressure maintenance are analyzed and confirmed after the test.

[0014] Furthermore, for inorganic glass, the load magnification factor is 2.0; for stretched organic glass material, the load magnification factor is 2.0; for cast organic glass material, the load magnification factor is 4.0.

[0015] In summary, the present invention has the following beneficial effects: A pressurization cavity and a damage control device are provided, and a test piece installation port is opened on one side of the pressurization cavity to connect the windshield test piece and the damage control device. Internal pressurization, pressure relief, or pressure monitoring is performed on the pressurization cavity through the cavity function hole. The damage control device is provided and located outside the windshield test piece and performs instantaneous impact on the windshield test piece. The damage control device is remotely controlled and started to verify the safety of the windshield in the event of instantaneous damage, while ensuring the safety of the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 The present invention is a schematic structural diagram of a test device for verifying the instantaneous breakage safety of a windshield.

[0018] In the figure, 1. pressurized cavity; 1-1. cavity functional hole; 1-2. test piece installation port; 2. cavity bottom connecting plate; 3. device connecting bracket; 4. damage control cylinder; 5. damage control circuit; 6. windshield test piece. DETAILED DESCRIPTION

[0019] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings, and this embodiment does not constitute a limitation of the present invention. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0020] A test device for verifying the instantaneous damage safety of windshield glass, such as Figure 1 As shown, it includes a pressurized cavity 1 and a damage control device. The pressurized cavity 1 includes a test piece installation port 1-2 opened on one side and a through hole on the other side. The test piece installation port 1-2 is sealed and connected to a windshield test piece 6. The through hole is connected to a cavity bottom connection plate 2. The cavity bottom connection plate 2 is sealed and connected to the pressurized cavity 1. Among them, the windshield test piece 6 is connected to the test piece installation port 1-2 through fasteners, and the fasteners can be structures such as screws. The sealing performance between the windshield test piece 6 and the test piece installation port 1-2 is achieved through the windshield test piece 6 body or by applying a sealant; similarly, the cavity bottom connecting plate 2 can also be sealed and connected to the through hole position by fasteners such as screws.

[0021] like Figure 1 As shown, one or more cavity function holes 1-1 are provided on the periphery of the boost cavity 1, and internal pressurization, pressure relief, and pressure monitoring are performed on the boost cavity 1 through the cavity function holes 1-1; The damage control device is located outside the windshield test piece 6 and performs instantaneous impact on the windshield test piece 6; specifically, the damage control device includes a damage control cylinder 4, the output end of the damage control cylinder 4 is aimed at the windshield test piece 6, and the output end of the damage control cylinder 4 can be connected to a sharp impact head such as a drill bit; In this embodiment, the damage control device is installed on the device connection bracket 3, and the device connection bracket 3 is connected to the side of the boost chamber 1 where the test piece installation port 1-2 is set by welding or fastener assembly. The damage control device can be detachably connected to the device connection bracket 3 by screws to facilitate adjustment of the distance between the damage control cylinder 4 and the windshield test piece 6. The damage control cylinder 4 is connected to the damage control circuit 5, and is connected to the control system through the damage control circuit 5 to control the instantaneous impact of the drill or other sharp metal in the damage control cylinder 4 with the windshield test piece 6, so as to achieve instantaneous damage to the windshield glass; The movement stroke of the drill or other sharp metal in the damage control cylinder 4 is adjustable, so that different degrees of windshield damage safety tests can be achieved according to different test requirements; the damage control line 5 can be appropriately extended to ensure the safety of the operator.

[0022] In this embodiment, a boost chamber 1 and a damage control device are provided, and a test piece installation port 1-2 is opened on one side of the boost chamber 1 to connect the windshield test piece 6 and the damage control device. Internal pressurization, pressure relief, or pressure monitoring is performed on the boost chamber 1 through the cavity function hole 1-1. The damage control device is provided and located on the outside of the windshield test piece 6 and performs instantaneous impact on the windshield test piece 6, so that the damage control device can be remotely controlled and started, which solves the problem that traditional damage safety test equipment is difficult to take into account the safety of test personnel, meet the windshield pressurization requirements, and achieve the instantaneous damage assessment requirements of the windshield. While verifying the safety of the windshield in the case of instantaneous damage, the safety of the operator is ensured.

[0023] This embodiment also discloses a test method for verifying the instantaneous breakage safety of a windshield, comprising the following steps: Step S1, according to the actual technical state requirements, gradually pressurize the inside of the boost chamber 1 to make its internal pressure reach P1=△Pt+△Pa, where △Pt is the maximum setting value of the aircraft pressure relief valve, and △Pa is the aircraft cabin pneumatic negative pressure; this pressure tolerance needs to be a positive value to ensure complete assessment; Step S2, remotely controlling the damage control cylinder 4 to move through the control system, setting the stroke of the damage control device to break the glass according to the requirements of the damaged part of the windshield to be verified, and ensuring accurate positioning to the damaged part of the windshield, so as to achieve instantaneous damage to the windshield test piece 6; Step S3, pressure compensation is performed inside the boost chamber 1, so that the internal pressure reaches P2=,n×(△Pt+△Pa), where n is the load magnification factor, which is determined according to the material of the windshield; and pressure maintenance is started, and the pressure maintenance time is determined according to the flight time of the verification product; When a single layer of the windshield structure is damaged, the material properties, material property variation, performance degradation in service, and the influence of critical environment should be considered. A load magnification factor is required to cover the influence of these factors, that is, the pressure load of the damage safety test is n×(△Pt+△Pa), where the magnification factor n is combined with the commonly used materials of the windshield, and the commonly used magnification factors include: For inorganic glass, the load magnification factor is 2.0; for stretched organic glass materials, the load magnification factor is 2.0; for cast organic glass materials, the load magnification factor is 4.0; Step S4, monitoring the pressure inside the pressurized chamber 1, analyzing and confirming the state of the test piece and the pressure maintenance after the test, and determining whether the test results meet the relevant technical requirements.

[0024] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions should also be deemed to fall within the protection scope of the technical solution of the present invention.

Claims

1. A test device for verifying the instantaneous damage safety of windshield glass, characterized in that: The invention comprises a pressurizing cavity (1) and a damage control device. A test piece installation port (1-2) is provided on one side of the pressurizing cavity (1). The test piece installation port (1-2) is sealed and connected to a windshield test piece (6). A plurality of cavity function holes (1-1) are provided on the periphery of the pressurizing cavity (1). Internal pressurization and / or pressure relief and / or pressure monitoring are performed on the pressurizing cavity (1) through the cavity function holes (1-1). The damage control device is located outside the windshield test piece (6) and performs instantaneous impact on the windshield test piece (6).

2. A test device for verifying the instantaneous damage safety of windshield glass according to claim 1, characterized in that: The damage control device comprises a damage control cylinder (4), wherein an output end of the damage control cylinder (4) is aligned with a windshield test piece (6).

3. A test device for verifying the instantaneous damage safety of windshield glass according to claim 2, characterized in that: The output end of the damage control cylinder (4) is provided with a sharp impact head.

4. A test device for verifying the instantaneous damage safety of windshield glass according to claim 2, characterized in that: The output end of the damage control cylinder (4) is provided with a drill bit.

5. A test device for verifying the instantaneous damage safety of windshield glass according to claim 1 or 2, characterized in that: The damage control device is mounted on a device connection bracket (3), and the device connection bracket (3) is connected to the outside of the boost chamber (1).

6. A test device for verifying the instantaneous damage safety of windshield glass according to claim 1, characterized in that: The pressurized cavity (1) comprises a through hole on a side away from the test piece installation port (1-2) and a cavity bottom connecting plate (2) at the position of the through hole, and the cavity bottom connecting plate (2) is sealingly connected to the pressurized cavity (1).

7. A test device for verifying the instantaneous damage safety of windshield glass according to claim 1 or 6, characterized in that: The windshield test piece (6) is connected to the test piece installation port (1-2) via a fastener.

8. A test device for verifying the instantaneous damage safety of a windshield according to claim 1 or 6, characterized in that: The test piece installation port (1-2) is sealed by the windshield test piece (6) body, or a sealant layer is provided between the two to achieve sealing.

9. A test method based on the test device for verifying the instantaneous damage safety of windshield glass according to claim 1, characterized in that: The following steps are included: Gradually pressurizing the interior of the pressurized cavity (1) so that its internal pressure reaches P1=△Pt+△Pa, where △Pt is the maximum setting value of the aircraft pressure relief valve and △Pa is the pneumatic negative pressure of the aircraft cabin; According to the requirements of the damaged part of the windshield to be verified, the stroke of the damage control device to break the glass is set, and it is ensured that the damaged part of the windshield is accurately positioned to achieve instantaneous damage to the windshield test piece (6); Perform pressure compensation inside the boost chamber (1) to make its internal pressure reach P2 = n×(△Pt+△Pa), where n is the load amplification factor determined according to the material of the windshield; and start to maintain the pressure, the pressure maintenance time is determined according to the flight time of the verification product; The pressure inside the pressurized chamber (1) is monitored, and after the test, the state of the test piece and the pressure maintenance are analyzed and confirmed.

10. A test method for verifying the instantaneous damage safety of a windshield according to claim 9, characterized in that: For inorganic glass, the load magnification factor is 2.0; for stretched organic glass materials, the load magnification factor is 2.0; for cast organic glass materials, the load magnification factor is 4.0.

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