A method for calculating resistance output of a constant resistance energy dissipation device

Abstract

The application discloses a resistance output calculation method of a constant resistance energy dissipation device, relates to the ship interception technical field, and comprises the following steps: establishing a simplified constant resistance energy dissipation device, determining the elongation of other multiple energy dissipation cables according to the number and elongation of the first tension energy dissipation cable; calculating the total resistance output value according to the elongation of each energy dissipation cable; and calculating the maximum resistance and the minimum resistance output by the device according to the arrangement mode of the energy dissipation cables of the constant resistance energy dissipation device. The application can quickly and accurately calculate the output resistance value of the constant resistance energy dissipation device, design the constant resistance energy dissipation device suitable for engineering application, reduce the workload and cost during engineering design, and has high engineering value.

Description

Technical Field

[0001] This invention relates to the field of ship interception technology, and in particular to a method for calculating the resistance output of a constant resistance energy-consuming device. Background Technology

[0002] Large bridges are generally divided into navigable channel bridges and non-navigable channel bridges, with non-navigable channel bridges accounting for a higher proportion among cross-sea bridges. Because non-navigable channel bridges have low clearance and do not allow ships to pass through, they need to be stopped before a collision occurs. Therefore, collision prevention for non-navigable channel bridges generally adopts interception systems. In collision prevention interception systems for non-navigable channel bridges, constant resistance energy dissipation devices are often used to consume the enormous kinetic energy of the intercepted ship.

[0003] The constant resistance energy dissipation device consists of a main rope and an energy dissipation cable, which dissipates the ship's kinetic energy through the tensile fracture of the energy dissipation cable. Currently, the resistance output of the constant resistance energy dissipation device can only be obtained through tensile failure tests and numerical simulations, and there is no accurate calculation formula, which is not conducive to its engineering design.

[0004] Therefore, those skilled in the art need to solve the technical problem that the constant resistance energy-consuming device in the prior art cannot accurately calculate the output resistance value. Summary of the Invention

[0005] The purpose of this invention is to provide a method for calculating the resistance output of a constant resistance energy-consuming device, thereby solving the problem that existing constant resistance energy-consuming devices cannot accurately calculate the output resistance value.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A method for calculating the resistance output of a constant resistance energy dissipation device includes the following steps:

[0008] Step 1: Establish a simplified constant resistance energy dissipation device. Based on the number and elongation of the first tension energy dissipation cable, determine the elongation of the other energy dissipation cables. The calculation formula is shown in Formula (I):

[0009]

[0010] In the above formula, Φ represents the displacement of the moving end of the main rope of the constant resistance energy dissipation device, and l ji Let L be the elongation of the energy dissipation cable numbered j when the first tension energy dissipation cable is numbered i, where L is the length of the energy dissipation cable, s is the initial spacing between the energy dissipation cables, ζ is the elongation rate of the energy dissipation cable, α is the angle between the tension energy dissipation cable and the main rope, and i and j are the numbers of the energy dissipation cables.

[0011] Step 2: Calculate the resistance output value based on the elongation of each energy-consuming cable, and then calculate the total resistance output value of the constant resistance energy-consuming device;

[0012] The formula for calculating the resistance output value based on the elongation of each energy-consuming cable is shown in Formula (II):

[0013]

[0014] The formula for calculating the total resistance output of a constant resistance energy dissipation device is shown in Formula (III):

[0015]

[0016] In the above formula, F is the total tension of the energy-dissipating cable. ji The tensile force of a single energy-dissipating cable is given by A and k, which are both tensile performance parameters of the energy-dissipating cable.

[0017] Step 3: Based on the arrangement of the energy-consuming cables of the constant resistance energy-consuming device, calculate the maximum and minimum resistance output by the device. The calculation formula is shown in Formula (IV):

[0018]

[0019] The constraint condition for the number of energy-consuming cables m is as shown in Formula (V):

[0020]

[0021] In the above formula, m is the maximum number of energy dissipation cables that are simultaneously under tension on the device. m is determined by the elongation ζ, spacing s, and length L of the energy dissipation cables on the device.

[0022] Preferably, in step one, the simplified structure of the constant resistance energy dissipation device includes a main rope and energy dissipation cables. The first end of the main rope is connected to the fixed end of the main rope, and the last end of the main rope is connected to the moving end of the main rope. Multiple sets of energy dissipation cables are arranged in parallel between the first end and the last end of the main rope.

[0023] Preferably, the main rope is a chain structure, which is connected by locking rings, and the two ends of the energy-dissipating cable are connected to the locking rings.

[0024] Preferably, before the constant resistance energy dissipation device is put into operation, the lengths of the multiple sets of energy dissipation cables are all equal, and the spacing between adjacent energy dissipation cables is all equal.

[0025] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0026] This invention discloses a method for calculating the resistance output of a constant-resistance energy dissipation device. The invention establishes a general calculation and analysis model, analyzes the tensile state of the energy dissipation cable during operation, derives the relationship between the tensile lengths of each energy dissipation cable, and then obtains the functional relationship between the resistance output and the displacement of the moving end of the device. The magnitude of the resistance output of the constant-resistance energy dissipation device changes with the breakage of the energy dissipation cable; the resistance output is greatest before the first tensioned energy dissipation cable breaks, and the resistance output is minimum at the instant the first energy dissipation cable breaks. Further, the calculation formulas for the maximum and minimum resistance that the constant-resistance device can provide are derived. This invention can quickly and accurately calculate the output resistance value of a constant-resistance energy dissipation device, enabling the design of a constant-resistance energy dissipation device suitable for engineering applications, reducing the workload and cost in device engineering design, and has significant engineering value. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings.

[0028] Figure 1 This is a schematic diagram of various parameters of a constant resistance energy dissipation device according to the present invention;

[0029] Figure 2 This is a comparison chart of resistance output results according to an embodiment of the present invention.

[0030] Explanation of the markings in the attached diagram: 1. Main rope; 11. Fixed end of the main rope; 12. Moving end of the main rope; 2. Energy dissipation cable. Detailed Implementation

[0031] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0032] A method for calculating the resistance output of a constant resistance energy dissipation device includes the following steps:

[0033] Step 1: Establish a simplified constant resistance energy dissipation device. Based on the number and elongation of the first tension energy dissipation cable, determine the elongation of the other energy dissipation cables. The calculation formula is shown in Formula (I):

[0034]

[0035] In the above formula, Φ represents the displacement of the moving end of the main rope of the constant resistance energy dissipation device, and l ji Let L be the elongation of the energy dissipation cable numbered j when the first tension energy dissipation cable is numbered i, where L is the length of the energy dissipation cable, s is the initial spacing between the energy dissipation cables, ζ is the elongation rate of the energy dissipation cable, α is the angle between the tension energy dissipation cable and the main rope, and i and j are the numbers of the energy dissipation cables.

[0036] Specifically, the derivation principle of Formula (I) is as follows: After the constant resistance energy dissipation device enters the working state, when the first energy dissipation cable is under tension, the adjacent energy dissipation cable gradually approaches. When the distance between them decreases to a certain extent, the next energy dissipation cable begins to be under tension. The distance between the two tensioned energy dissipation cables at this time is defined as the critical distance Δ, and the angle between the tensioned cable and the main rope is defined as the critical angle α. When the elongation of the first energy dissipation cable reaches a certain value, the next energy dissipation cable begins to be under tension. Based on this force process, the constant resistance energy dissipation device is simplified. One end of the device is the fixed end 11 of the main rope, and the other end is the moving end 12 of the main rope. Formula (I) is derived to calculate the elongation of each subsequent energy dissipation cable when the first tensioned energy dissipation cable is numbered i.

[0037] Step 2: Calculate the resistance output value based on the elongation of each energy-consuming cable, and then calculate the total resistance output value of the constant resistance energy-consuming device;

[0038] The formula for calculating the resistance output value based on the elongation of each energy-consuming cable is shown in Formula (II):

[0039]

[0040] The formula for calculating the total resistance output of a constant resistance energy dissipation device is shown in Formula (III):

[0041]

[0042] In the above formula, F is the total tension of the energy-dissipating cable. ji The tensile force of a single energy-dissipating cable is given by A and k, which are both tensile performance parameters of the energy-dissipating cable.

[0043] Specifically, the constant resistance energy dissipation device provides resistance through the deformation and breakage of each energy dissipation cable. The output resistance is the sum of the tension of the energy dissipation cables. After calculating the elongation of each energy dissipation cable using formula (I), the resistance output by the device at the displacement of each main rope moving end 12 can be calculated using formulas (II) and (III).

[0044] Step 3: Based on the arrangement of the energy-consuming cables of the constant resistance energy-consuming device, calculate the maximum and minimum resistance output by the device. The calculation formula is shown in Formula (IV):

[0045]

[0046] The constraint condition for the number of energy-consuming cables m is as shown in Formula (V):

[0047]

[0048] In the above formula, m is the maximum number of energy dissipation cables that are simultaneously under tension on the device. m is determined by the elongation ζ, spacing s, and length L of the energy dissipation cables on the device.

[0049] Specifically, the magnitude of the resistance output of the constant resistance energy dissipation device changes with the breakage of the energy dissipation cable. The resistance output is the largest before the first tension energy dissipation cable breaks, and the resistance output is the smallest at the moment the first energy dissipation cable breaks. Therefore, formula (IV) is derived, which can quickly calculate the maximum and minimum resistance output of the constant resistance device under different numbers of energy dissipation cables.

[0050] In step one, the simplified structure of the constant resistance energy dissipation device includes a main rope 1 and an energy dissipation cable 2. The first end of the main rope 1 is connected to the fixed end 11 of the main rope, and the end of the main rope 1 is connected to the moving end 12 of the main rope. Multiple sets of the energy dissipation cables 2 are arranged in parallel between the first end and the end of the main rope 1.

[0051] The main rope 1 is a chain structure, which is connected by locking rings, and the two ends of the energy dissipation cable 2 are connected to the locking rings.

[0052] Before the constant resistance energy dissipation device is put into operation, the lengths of the multiple sets of energy dissipation cables 2 are all equal, and the spacing between adjacent energy dissipation cables 2 is also equal.

[0053] One embodiment uses 8mm PA66 nylon cable as the energy dissipation cable to arrange the constant resistance energy dissipation device. According to previous tensile tests, the critical spacing of the energy dissipation cable 2 is directly proportional to the spacing s of the energy dissipation cables, which is measured to be approximately Δ = 0.05s. The relationship between the force F of the energy dissipation cable 2 under tension and the elongation l of the energy dissipation cable is obtained by fitting the test results through a single PA66 nylon cable tensile test. The relationship between force F and elongation l is F = 0.0000079l. 2.36 The resistance output curve of the constant resistance energy dissipation device was calculated with an energy dissipation cable length L = 2200 mm and a spacing s = 100 mm. The calculation results were compared with the results of tensile failure tests under the same parameters to verify the correctness of the calculation method of the present invention. The comparison results are as follows: Figure 2 As shown.

[0054] The following sections briefly describe the calculation process of the resistance output value of the constant resistance device, taking displacements of Φ=550mm and Φ=600mm as examples.

[0055] (1) When Φ=550mm, according to formula (I), the first tensioned energy dissipation cable of the device is numbered 1 and is about to break. Before the breakage of energy dissipation cable 1, the elongations of energy dissipation cables 1, 2, and 3 are respectively l 11 =550mm, l 21 =350.2mm, l 31 =150.4mm, and the tension F of each energy-dissipating cable at this time is calculated by formula (II). 11 =23.167kN, F 21 = 7.984kN, F31 =1.086kN, and finally, using formula (III), the resistance value F = 32.237kN output by the constant resistance device before the No. 1 energy dissipation cable breaks; after the No. 1 energy dissipation cable breaks, the elongations of the No. 2 and No. 3 energy dissipation cables are respectively l 22 =350mm, l 32 =150.2mm, and the tension F of each energy dissipation cable at this time is calculated by formula (II). 22 = 7.973kN, F 32 =1.083kN, and finally, through formula (III), the instantaneous output resistance value F of the constant resistance device after the No. 1 energy dissipation cable breaks is obtained as 9.056kN;

[0056] (2) When Φ=600mm, according to formula (I), the number of the first tension energy dissipation cable of the device is 2. At this time, the elongations of energy dissipation cables No. 2, No. 3, and No. 4 are respectively l 22 =400mm, l 32 =200.2mm, l 42 =0.4mm, and the tension F of each energy-dissipating cable at this time can be calculated using formula (II). 22 =10.927kN, F 32 =2.133kN, F 42 =9.088×10 -7 kN, and finally, the resistance value F = 12.430kN output by the constant resistance device when the displacement is 600mm is obtained by formula (III).

[0057] like Figure 2 As shown in the diagram, the resistance output results of the constant resistance device are compared. The line marked with a box represents the resistance output result calculated by the theoretical formula, while the other line marked with a triangle represents the resistance output result obtained from the tensile failure test. The results show that the force-displacement curves of the two devices exhibit the same trend. During the tensile failure test, the main ropes of the constant resistance device experience mutual compression and entanglement under stress, affecting the device's resistance output and causing abrupt changes in the resistance output value. These abrupt changes are not considered when comparing the results. In this industry, there are currently no relevant regulations regarding the resistance output of constant resistance energy-consuming devices. Therefore, this invention only compares the errors between the maximum and minimum constant force output values ​​of the device. The errors are relatively small, at 2.4% and 5.2% respectively, fully demonstrating the feasibility of the calculation method proposed in this invention. This calculation method can be used for the specific setting of the constant resistance device.

[0058] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0059] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A method for calculating the resistance output of a constant resistance energy-consuming device, characterized in that: Includes the following steps: Step 1: Establish a simplified constant resistance energy dissipation device. Based on the number and elongation of the first tension energy dissipation cable, determine the elongation of the other energy dissipation cables. The calculation formula is shown in Formula (I): In the above formula, Φ represents the displacement of the moving end of the main rope of the constant resistance energy dissipation device, and l ji Let L be the elongation of the energy dissipation cable numbered j when the first tension energy dissipation cable is numbered i, where L is the length of the energy dissipation cable, s is the initial spacing between the energy dissipation cables, ζ is the elongation rate of the energy dissipation cable, α is the angle between the tension energy dissipation cable and the main rope, and i and j are the numbers of the energy dissipation cables. Step 2: Calculate the resistance output value based on the elongation of each energy-consuming cable, and then calculate the total resistance output value of the constant resistance energy-consuming device; The formula for calculating the resistance output value based on the elongation of each energy-consuming cable is shown in Formula (II): The formula for calculating the total resistance output of a constant resistance energy dissipation device is shown in Formula (III): In the above formula, F is the total tension of the energy-dissipating cable. ji The tensile force of a single energy-dissipating cable is given by A and k, which are both tensile performance parameters of the energy-dissipating cable. Step 3: Based on the arrangement of the energy-consuming cables of the constant resistance energy-consuming device, calculate the maximum and minimum resistance output by the device. The calculation formula is shown in Formula (IV): The constraint condition for the number of energy-consuming cables m is as shown in Formula (V): In the above formula, m is the maximum number of energy dissipation cables that are simultaneously under tension on the device. m is determined by the elongation ζ, spacing s, and length L of the energy dissipation cables on the device.

2. The method for calculating the resistance output of a constant resistance energy-consuming device as described in claim 1, characterized in that: In step one, the simplified structure of the constant resistance energy dissipation device includes a main rope (1) and an energy dissipation cable (2). The first end of the main rope (1) is connected to the fixed end (11) of the main rope, and the end of the main rope (1) is connected to the moving end (12) of the main rope. Multiple sets of the energy dissipation cables (2) are arranged in parallel between the first end of the main rope (1) and the end of the main rope (1).

3. The method for calculating the resistance output of a constant resistance energy-consuming device as described in claim 2, characterized in that: The main rope (1) is a chain structure, which is connected by locking rings, and the two ends of the energy-consuming cable (2) are connected to the locking rings.

4. The method for calculating the resistance output of a constant resistance energy-consuming device as described in claim 2, characterized in that: Before the constant resistance energy dissipation device is put into operation, the lengths of the multiple sets of energy dissipation cables (2) are all equal, and the spacing between adjacent energy dissipation cables (2) is also equal.

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