A modular node multimodal interface force transmission test system

Abstract

The present invention discloses a modular node multi-modal interface force transmission test system, which relates to the field of high-end equipment manufacturing technology. The key points of its technical solution are: including a node modal control device and a node interface force transmission test system; the node modal control device includes a reaction frame, at least two node fixing beams, at least two groups of spiral micro-motion rods and at least two node structures, which are used to fix node structures of different structural types and adjust the mode of the node structure; the node interface force transmission test system includes a distributed optical fiber packaging shell, a distributed optical fiber, a rotating shaft, a portable computer, a distributed optical fiber demodulator, a data jumper, an optical fiber jumper and an optical fiber adapter flange, which are used to monitor the stress transfer distribution of different interfaces of the node and calculate the force transmission contribution of different interfaces. Through its modular design, this system can adapt to different forms of node testing needs, and realize accurate measurement of the node interface force transmission distribution and force transmission contribution through the built-in sensing optical fiber.

Description

Technical Field

[0001] The present invention relates to the technical field of high-end equipment manufacturing, and more specifically, to a modular node multi-modal interface force transmission testing system. Background Art

[0002] In the field of high-end equipment manufacturing, especially in buildings and engineering structures, nodes are key parts that connect different components. Their design and performance are crucial to the stability and safety of the entire structure. With the rise of prefabricated buildings, prefabricated dry nodes are increasingly valued for their ease of construction and structural flexibility. Compared with traditional continuous components, prefabricated dry nodes have significant differences in stress transfer mechanisms. They mainly rely on contact at the node interface to transfer stress. This contact transfer method leads to complex stress distribution on the various interfaces of the node, and stress concentration is prone to occur in the node area. Therefore, precise testing of the interface force transmission characteristics of these nodes is of great significance for evaluating and optimizing node design and improving structural safety.

[0003] Currently, methods for measuring contact stress at joint interfaces are relatively limited, primarily relying on traditional pressure cell testing. These methods only produce uniformly distributed stress levels and fail to accurately capture important local contact stress information. This limitation restricts the precise measurement of joint interface force distribution, hindering the accurate performance evaluation and optimized design of prefabricated dry joints.

[0004] In order to solve the above problems, a Chinese patent (patent publication number: CN209372280U) discloses a casting node stress testing device, including a test installation shell, a first stress testing sensor is adhered to the inner side of the test installation shell, and a liquid crystal display is installed on the outer surface of the test installation shell, a second stress testing sensor is placed inside the upper shell arranged at the top of the test installation shell, and a controller is installed inside the metal frame welded on the right surface of the test installation shell, a rubber gasket is laid inside the external protective frame arranged on the outside of the test installation shell, and a first shock-absorbing spring and a second shock-absorbing spring are arranged on the left and right sides of the external protective frame.

[0005] The above solution solves the problems of the relatively simple structure of the casting stress testing device and the lack of protection of the casting stress testing device; however, the casting node stress testing device still has some defects: first, the casting node stress testing device mainly relies on the first and second stress testing sensors to capture stress information, and may not be able to accurately capture the important local contact stress information on the node interface; second, the device may only support stress testing of a single mode and cannot simultaneously control and test node behavior under multiple modes, which may lead to incomplete test results in complex structures. Summary of the Invention

[0006] The purpose of the present invention is to provide a modular node multimodal interface force transmission testing system, which can adapt to different forms of node testing needs through a detachable and spliced ​​unit design, and can achieve accurate measurement of the node interface force transmission distribution and force transmission contribution through built-in sensing optical fiber.

[0007] The above technical objectives of the present invention are achieved through the following technical solutions: a modular node multi-modal interface force transmission test system, including a node modal control device and a node interface force transmission test system; the node modal control device includes a reaction frame, at least two node fixing beams, at least two groups of spiral micro-motion rods and at least two node structures, each group of spiral micro-motion rods includes at least one first spiral micro-motion rod and one second spiral micro-motion rod; the node structure is detachable and replaceable, and is used to fix node structures of different structural types and adjust the mode of the node structure;

[0008] The node interface force transmission test system includes a distributed optical fiber packaging shell, a distributed optical fiber, a rotating shaft, a portable computer, a distributed optical fiber demodulator, a data jumper, an optical fiber jumper and an optical fiber adapter flange. The node interface force transmission test system is used to monitor the stress transfer distribution of different interfaces of the node and calculate the force transmission contribution of different interfaces.

[0009] The present invention is further configured as follows: the node structure includes a first node structure and a second node structure, and the first node structure and the second node structure are respectively fixed to the first node fixed beam and the second node fixed beam by bolts.

[0010] The present invention is further configured as follows: the node fixed beam is fixed in the reaction frame through the spiral micro-motion rod, the first spiral micro-motion rod is fixed to one of the node fixed beams through a ball joint, and controls the relative rotation angle of the node structure in different directions, and the second spiral micro-motion rod is fixed to the other node fixed beam, and controls the relative tightness of the node structure.

[0011] The present invention is further configured as follows: the distributed optical fiber is embedded in the distributed optical fiber packaging shell, and the distributed optical fiber packaging shell is a countersunk structure, and a distributed interface force transmission sensing pad is formed by splicing two by two through countersunk tenons and grooves, which is used to test the stress distribution, force transmission evolution and contribution of different interfaces of the node.

[0012] By adopting the above technical solution, the present invention can adapt to different forms of node testing needs through a detachable and spliced ​​unit body design, and realize accurate measurement of the node interface force distribution and force transmission contribution through the built-in sensing optical fiber. This not only improves the flexibility and adaptability of the system, but also enhances the multi-modal testing capability, so that the system can control and test node behavior under multiple modes. In addition, the node structure is fixed to the node fixing beam by bolts, and the node fixing beam is fixed in the reaction frame by a spiral micro-rod, ensuring structural stability and safety during the test. The sinking and plugging structure design of the distributed optical fiber packaging shell enables the distributed interface force transmission sensing pad to be flexibly spliced, which is convenient for installation and adjustment, and provides a reliable and flexible sensing interface.

[0013] The present invention also possesses powerful data acquisition and processing capabilities. The combined use of a portable computer and a distributed fiber demodulator enables real-time monitoring and analysis of stress transfer distribution at the node interface. The user-friendly interface allows operators to intuitively monitor the test process and results, improving operational convenience. Furthermore, the design of an external protective frame and shock-absorbing springs enables the present invention to operate stably under various environmental conditions, improving the reliability of test results. The modular and detachable design reduces maintenance costs, improves the economic efficiency of the system, and makes it more suitable for a wide range of industrial applications.

[0014] Another object of the present invention is to provide a method for using the above-mentioned modular node multimodal interface force transmission testing system, comprising the following steps:

[0015] S1: Install the node structure to be tested;

[0016] S2: adjusting the node mode control device to fix and adjust the mode of the node structure;

[0017] S3: Place the distributed interface force sensing pad between the node structures;

[0018] S4: Collect and process stress distribution data using a portable computer and distributed optical fiber interrogator;

[0019] S5: Analyze the force transmission contribution of different interfaces.

[0020] By adopting the above technical solution, the present invention not only improves the accuracy and efficiency of node testing, but also enhances the adaptability and economy of the system. It has important practical application value for the field of high-end equipment manufacturing, especially for node testing in buildings and engineering structures. It makes the test of the force transmission characteristics of the node interface more accurate and reliable, and provides strong technical support for structural design and safety assessment.

[0021] Another object of the present invention is to provide a distributed interface force transmission sensing pad, which is composed of multiple distributed interface force transmission sensing units spliced ​​together in pairs through mortise and tenon joints, and is used to sense the stress distribution of the contact interface of the node structure. The splicing and series connection are achieved through optical fiber adapter flanges to realize stress testing of the entire interface of the node structure.

[0022] By adopting the above technical solution, the distributed interface force transmission sensing pad of the present invention is composed of a plurality of distributed interface force transmission sensing units, which can be spliced ​​in pairs through the mortise and tenon joints to form a flexible and modular sensing pad to adapt to node structures of different sizes and shapes. In this way, the sensing pad can accurately sense the stress distribution of the contact interface of the node structure, providing key data for structural analysis. In addition, the sensing pad is spliced ​​and connected in series through the optical fiber adapter flange, so that the entire interface of the node structure can be stress tested, covering the entire contact area, thereby providing comprehensive test data. This full-interface testing capability not only enhances the integrity assessment of the structure, but also helps to discover potential structural weaknesses and improve the safety and reliability of the structure. At the same time, the design of the mortise and tenon joints simplifies the installation and maintenance process of the sensing pad, reducing the difficulty and cost of maintenance. The sensing pad has strong adaptability and can be applied to a variety of node structures and materials. It has a wide range of applications and can adapt to changing engineering and architectural environments.

[0023] Another object of the present invention is to provide a distributed optical fiber packaging shell, which is made of elastic material and can transfer external stress to the distributed optical fiber. It has a tongue and groove structure, which can enable the distributed interface force transmission sensing units to be spliced ​​in pairs to form a planar distributed interface force transmission sensing pad. The number of distributed interface force transmission sensing units can be adjusted according to the interface length to be tested, thereby improving the flexibility of the sensing test system.

[0024] By adopting the above technical solution, the distributed optical fiber packaging shell of the present invention is made of elastic material, which can effectively transmit external stress to the internal distributed optical fiber, ensuring the accuracy and reliability of the sensing signal. The tongue and groove structure design of the shell allows the distributed interface force transmission sensing units to be spliced ​​in pairs to form a planar distributed interface force transmission sensing pad. This not only enhances the structural integrity of the sensing pad, but also allows the number of distributed interface force transmission sensing units to be flexibly adjusted according to the interface length to be tested, thereby achieving comprehensive coverage of node structures of different sizes and shapes. In this way, the present invention can adapt to changing engineering and architectural environments, meet different testing requirements, and greatly improve the adaptability and flexibility of the sensing test system. In addition, the use of elastic materials and the design of the tongue and groove structure simplifies the installation and maintenance process of the sensing pad, reduces the difficulty and cost of maintenance, and improves the durability and reliability of the system.

[0025] In summary, the present invention has the following beneficial effects:

[0026] 1. The present invention provides a modular node interface force transmission test system, which can adapt to different forms of node testing needs through its innovative detachable and spliced ​​unit design. The system's built-in sensing fiber technology realizes the precise measurement of the node interface force transmission distribution and force transmission contribution, ensuring the accuracy and reliability of the test data. The design of the first and second spiral micro-motion rods allows the horizontal displacement and rotation angle of the node fixed beam to be adjusted, enhancing the adaptability and testing flexibility of the system. In addition, the second spiral micro-motion rod can be arranged in two vertical directions of the cross section of the node fixed beam to achieve multi-angle control.

[0027] 2. The distributed interface force sensing unit of the present invention is able to sense the stress distribution of the contact interface of the node structure, and realizes splicing and series connection through the countersunk mortise and tenon grooves and the optical fiber adapter flange, thereby enhancing the scalability and modularity of the system. The node structure and the node fixing beam are connected by bolts to ensure the stability and reliability of the structure. Overall, the test system of the present invention provides a universal, practical and accurate solution for the contact interface force transmission test of different types of nodes, which helps to improve the accuracy of the design and performance evaluation of assembled dry nodes and enhance the safety and reliability of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings that constitute a part of this application are used to provide further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute improper limitations on this application.

[0029] Figure 1 1 is a schematic structural diagram of a size-adjustable node interface force transmission test system according to an embodiment of the present invention;

[0030] Figure 2 1 is a structural front view of a size-adjustable node interface force transmission testing system according to an embodiment of the present invention;

[0031] Figure 3 Schematic diagram of the node fixing beam and node structure in an embodiment of the present invention;

[0032] Figure 4 Schematic diagram of the structure of the first spiral micro-motion rod in an embodiment of the present invention;

[0033] Figure 5 Schematic diagram of the structure of the second spiral micro-motion rod in an embodiment of the present invention;

[0034] Figure 6 Schematic diagram of the structure of the distributed interface force sensing unit spliced ​​in an embodiment of the present invention;

[0035] Figure 7Schematic diagram of the structure of a distributed interface force sensing system in an embodiment of the present invention;

[0036] Figure 8 It is a front view of the distributed interface force sensing pad in an embodiment of the present invention.

[0037] In the figure: 1, reaction frame; 2, first node fixed beam; 3, second node fixed beam; 4, first spiral micro-motion rod; 5, second spiral micro-motion rod; 6, first node structure; 7, second node structure; 8, distributed interface force transmission sensing pad; 301, vertical ball joint fixing hole; 302, horizontal ball joint fixing hole; 303, axial ball joint fixing hole; 304, node fixed beam bolt hole; 401, first spiral micro-motion rod knob; 402, first spiral micro-motion rod reading scale; 403, first spiral micro-motion rod Rotary micro-motion rod connecting rod; 404, first ball-jointed connecting rod; 501, second spiral micro-motion rod knob; 502, second spiral micro-motion rod reading scale; 503, second spiral micro-motion rod connecting rod; 504, second ball-jointed connecting rod; 701, node bolt hole; 801, distributed optical fiber packaging shell; 802, distributed optical fiber; 803, rotating shaft; 804, portable computer; 805, distributed optical fiber demodulator; 806, data jumper; 807, optical fiber jumper; 808, optical fiber adapter flange. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described in detail below in conjunction with the embodiments of the present invention and the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0039] The following is combined with Figure 1-8 The present invention is described in further detail.

[0040] Example: A modular node multi-modal interface force transmission test system, such as Figure 1 As shown, it includes a reaction frame, eight first spiral micro-motion rods, two second spiral micro-motion rods, two node fixed beams (first node fixed beam, second node fixed beam), two node structures (first node structure, second node structure), a distributed interface force transmission sensing pad, a portable computer, a distributed optical fiber demodulator, and a data jumper.

[0041] The first node fixed beam and the second node fixed beam are connected to the reaction frame in the x-axis and z-axis directions respectively through the first spiral fine-tuning rod. The first spiral fine-tuning rod is fixed on the reaction frame. The end of the first spiral fine-tuning rod is connected to the first node fixed beam and the second node fixed beam through the first spiral fine-tuning rod connecting rod. The first spiral fine-tuning rod is fixed at the near end position of the node fixed beam, and the horizontal distance between the first spiral fine-tuning rod fixed position and the center of the ball of the spherical hinge connecting rod is l0, the height of the node fixed beam along the z-axis is h, and the spacing between the two first spiral fine-tuning rod fixed positions on the same surface of the node fixed beam is b. When only the two first spiral fine-tuning rods arranged along the x-axis direction are installed, and the two first spiral fine-tuning rods arranged along the y-axis direction are not installed, the first spiral fine-tuning rod knobs of the two first spiral fine-tuning rods arranged along the x-axis direction can be rotated at the same time to control the rotation angle of the node fixed beam, and the displacement size is read out by the first spiral fine-tuning rod reading scale.

[0042] When the two first spiral micro-motion rods move the same distance l y1 When the node fixed beam rotates around the x-axis When the two first spiral micro-motion rods move the same distance l in opposite directions y2 When the node fixed beam rotates around the y axis

[0043] The first node fixed beam and the second node fixed beam are respectively connected to the reaction frame in the y-axis direction through the second spiral micro-motion rod. The second spiral micro-motion rod is fixed to the reaction frame. The end of the second spiral micro-motion rod is connected to the first node fixed beam and the second node fixed beam through a ball joint connecting rod. The second spiral micro-motion rod can limit the displacement of the first node fixed beam and the second node fixed beam in the y-axis direction without limiting the rotation of the first node fixed beam and the second node fixed beam. Turning the knob of the second spiral micro-motion rod can control the displacement of the first node fixed beam and the second node fixed beam in the y-axis direction, and the displacement size is read out by the reading scale of the second spiral micro-motion rod.

[0044] The two node structures (the first node structure and the second node structure) are fixed to the first node fixing beam and the second node fixing beam respectively using bolts through the node fixing beam bolt hole and the node bolt hole. The node structure can be a node structure of different structural forms. In this embodiment, a concave-convex tenon structure is selected as the node structure form. Therefore, when testing the interface force transmission characteristics of different node structures, only the node structure can be replaced without replacing all devices, thereby reducing material waste and improving the scalability of the test system.

[0045] The distributed interface force sensing pad is formed by splicing two distributed interface force sensing units. Figure 6As shown, the distributed interface force sensing unit is composed of a distributed optical fiber and a distributed optical fiber packaging shell. The distributed optical fiber packaging shell is made of elastic material and can transmit external stress to the distributed optical fiber. The distributed optical fiber packaging shell has a tongue and groove structure, which allows the distributed interface force sensing units to be spliced ​​in pairs to form a planar distributed interface force sensing pad. The number of distributed interface force sensing units can be adjusted according to the interface length to be tested, thereby improving the flexibility of the sensing test system. The two distributed optical fibers in adjacent distributed interface force sensing units can be connected in series through optical fiber jumpers and optical fiber adapter flanges, thereby realizing a test channel to measure the data of the entire distributed interface force sensing pad.

[0046] When the distributed interface force transmission sensor pad is spliced ​​by distributed interface force transmission sensors, when there is a corner at the interface, the adjacent planes are connected by a rotating shaft. After the distributed interface force transmission sensor pad is spliced, the distributed interface force transmission sensor pad is placed between the first node structure and the second node structure, and the two second spiral micro-motion rods are adjusted to make the distributed interface force transmission sensor pad fully fit with the node structure. The distributed optical fiber demodulator is connected to the distributed interface force transmission sensor pad through a data jumper, and the distributed optical fiber demodulator is used to collect initial data. Adjust the two first spiral micro-motion rods connected to the first node fixed beam and arranged along the x-axis so that the rotation displacement is in the same direction and the displacement is l y1 , at this time the rotation angle between the first node structure and the second node structure is Strain data were collected using a fiber optic interrogator.

[0047] The stress distribution along the length of the distributed optical fiber can be expressed as: Among them E s , μ are the elastic modulus and Poisson's ratio of the distributed optical fiber package shell, ε f (x) is the strain distribution data of the distributed optical fiber, k is the reduction coefficient during the strain transmission process to the distributed optical fiber, and the k value is determined by calibration test.

[0048] After p(x) is interpolated and encrypted by Matlab, curve fitting is performed. After obtaining the fitting function, the pressure resultant force on a single distributed optical fiber with a length of l can be calculated as:

[0049] The resultant force F and the position D of the resultant force on any contact interface can be calculated: F = ∑P i a, Where a is the width of the distributed fiber package, and the bending moment on a single interface can be calculated as: M = FD. Comparing the force transmission variations of F and M at different interfaces and their contribution ratios can provide data support for optimizing node structure design.

[0050] In order to test the stress distribution and force transmission characteristics of each interface of the node structure under different rotation angles or torsion conditions, the first spiral micro-motion rod can be used to adjust the angle in different directions to collect and process the data of the distributed interface force transmission sensing pad.

[0051] In order to test the stress distribution and force transmission characteristics of each interface of the node structure at different opening distances, the second spiral micro-rod can be used to adjust the displacement in the y-axis direction and then collect and process the data of the distributed interface force transmission sensing pad.

[0052] This specific embodiment is merely an explanation of the present invention and is not intended to limit the present invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed. However, as long as such modifications are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A modular node multimodal interface force transmission test system, characterized by: The invention comprises a node modal control device and a node interface force transmission test system; the node modal control device comprises a reaction frame, at least two node fixing beams, at least two sets of spiral micro-motion rods, and at least two node structures, each set of spiral micro-motion rods comprising at least one first spiral micro-motion rod and one second spiral micro-motion rod; the node structure is detachable and replaceable, and is used to fix node structures of different structural types and adjust the mode of the node structure; The second spiral micro-motion rod is fixed to the node fixed beam through a ball joint, and a ball joint connecting rod is provided at its end: When the two first spiral micro-motion rods move the same distance l y1 When the node fixed beam rotates around the x-axis When the two first spiral micro-motion rods move the same distance l in opposite directions y2 When the node fixed beam rotates around the y axis The first node fixed beam and the second node fixed beam are respectively connected to the reaction frame in the x-axis and z-axis directions through the first spiral fine-motion rod, the first spiral fine-motion rod is fixed to the reaction frame, the end of the first spiral fine-motion rod is connected to the first node fixed beam and the second node fixed beam through the first spiral fine-motion rod connecting rod, the first spiral fine-motion rod is fixed at the near end position of the node fixed beam, the horizontal distance between the fixed position of the first spiral fine-motion rod and the center of the ball of the spherical hinge connecting rod is l0, the height of the node fixed beam along the z-axis is h, and the spacing between the two first spiral fine-motion rod fixed positions on the same surface of the node fixed beam is b; the first node fixed beam and the second node fixed beam are respectively connected to the reaction frame in the y-axis direction through the second spiral fine-motion rod; The node interface force transmission test system includes a distributed optical fiber packaging shell, a distributed optical fiber, a rotating shaft, a portable computer, a distributed optical fiber demodulator, a data jumper, an optical fiber jumper and an optical fiber adapter flange. The node interface force transmission test system is used to monitor the stress transfer distribution of different interfaces of the node and calculate the force transmission contribution of different interfaces; the distributed optical fiber packaging shell is a tongue and groove structure, and a distributed interface force transmission sensing pad is formed by splicing the tongue and groove in pairs. When there is a corner at the interface, the adjacent planes are connected by a rotating shaft.

2. The test system according to claim 1, wherein: The node structure includes a first node structure and a second node structure, and the first node structure and the second node structure are respectively fixed to the first node fixed beam and the second node fixed beam by bolts.

3. The test system according to claim 1, wherein: The node fixing beam is fixed in the reaction frame through the spiral micro-motion rod. The first spiral micro-motion rod is fixed to one of the node fixing beams through a ball joint and controls the relative rotation angle of the node structure in different directions. The second spiral micro-motion rod is fixed to the other node fixing beam and controls the relative tightness of the node structure.

4. The test system according to claim 1, wherein: The distributed optical fiber is embedded in the encapsulation shell, which is made of elastic material and satisfies the stress transfer formula: Among them E s , μ are the elastic modulus and Poisson's ratio of the distributed optical fiber package shell, ε f (x) is the strain distribution data of the distributed optical fiber, and k is the reduction coefficient during the strain transmission process to the distributed optical fiber.

5. A method for using the modular node multimodal interface force transmission testing system according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1: Install the node structure to be tested; S2: adjusting the node mode control device to fix and adjust the mode of the node structure; S3: Place the distributed interface force sensing pad between the node structures; S4: Collect and process stress distribution data using a portable computer and distributed optical fiber interrogator; S5: Analyze the force transmission contribution of different interfaces.

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