A simulation method for output characteristics of a three-state inertial switch

Abstract

The application discloses a simulation method of output characteristics of a three-state inertial switch, comprising the following steps: S1, establishing an inertial model based on the structure of an inertial system in the three-state inertial switch and performing simulation and solution to obtain the mechanical response of a mass block in the three-state inertial switch; S2, establishing a collision model of a collision process of the mass block from a front collision to an output electrode based on the contact relationship between the mass block and the output electrode and performing simulation and solution to obtain an invasion displacement time history; and S3, establishing an electromechanical conversion model and taking the invasion displacement time history of the mass block and the electrode as the input of the electromechanical conversion model, and performing simulation on the electromechanical conversion model to obtain the voltage time history of the output electrode as the output characteristics of the three-state inertial switch. The application can accurately simulate the output characteristics of the three-state inertial switch under different penetration environments.

Description

Technical Field

[0001] This invention belongs to the field of three-state inertial switch technology, specifically relating to a simulation method for the output characteristics of a three-state inertial switch. Background Technology

[0002] In modern warfare, to improve the survivability of destructive weapons, countries generally adopt measures such as deep underground burial and enhanced protective structures. Therefore, deep, thick targets like caves and multi-layered hard targets like ships have become primary targets for missiles. Statistics show that, compared to detonating on the surface, detonating the same chemical equivalent of explosive at the optimal location inside a hard target can increase energy coupling efficiency by 20 to 50 times. Controlling the warhead to detonate deep inside the hard target is key to achieving highly efficient damage.

[0003] Penetrating munitions typically possess precision guidance capabilities. Using fuses with delayed detonation functions, the detonation control signal can be controlled to be emitted at an appropriate time after the warhead enters the target's interior, thereby efficiently destroying the overall target structure and the personnel within it. Ensuring that the fuse design meets the corresponding tactical and technical specifications is one of the main tasks in penetrating fuse development. During the development process, it is difficult to fully consider the complexity and variability of the targets being struck. Precise control of the detonation point in hard-target penetrating fuses is crucial for achieving the intended damage effect. Some domestic research institutions have already studied methods for controlling the detonation point of penetrating fuses.

[0004] To achieve precise detonation control in penetration fuses, it is necessary to acquire the target signal during the projectile's penetration of the target plate. Using high-g sensors or acceleration threshold switches as sensing elements is the primary method for obtaining the projectile's penetration acceleration signal. The ease with which the target signal is identified significantly impacts the difficulty of subsequent signal processing. Currently, penetration fuses primarily use piezoelectric and piezoresistive accelerometers as high-g sensors. Both types of accelerometers are suitable for projectiles with short lengths. However, as projectile length and velocity increase, the difficulty of hole identification increases. To address this, a three-state inertial switch (patent publication number CN116007455A) has been developed, which can, to some extent, solve the problem of weak target exit signals in hole identification. However, the sensor's output characteristics are affected by various structural parameters, making it difficult to predict its output characteristics during the design process.

[0005] Therefore, how to simulate the output characteristics of this type of penetrating fuse three-state inertial switch is an urgent problem to be solved. Summary of the Invention

[0006] In view of this, the purpose of this invention is to propose a simulation method for the output characteristics of a three-state inertial switch, which can accurately simulate the output characteristics of a three-state inertial switch under different penetration environments.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] The present invention provides a method for simulating the output characteristics of a three-state inertial switch, comprising:

[0009] Step S1: Based on the structure of the inertial system in the three-state inertial switch, establish an inertial model and perform simulation to obtain the mechanical response of the mass block in the three-state inertial switch;

[0010] Step S2: Based on the contact relationship between the mass block and the output electrode in the three-state inertial switch, establish a collision model of the collision process of the mass block rushing to the output electrode and perform simulation to obtain the intrusion displacement time history.

[0011] Step S3: Establish an electromechanical conversion model and use the time history of the intrusion displacement of the mass block and the electrode as the input of the electromechanical conversion model. Simulate the electromechanical conversion model to obtain the voltage time history of the output electrode as the output characteristic of the three-state inertial switch.

[0012] Furthermore, step S1 includes:

[0013] Based on the structure of the inertial system in a three-state inertial switch, the following inertial model is established:

[0014]

[0015] Where m represents the mass of the mass block, c represents the damping coefficient, k represents the stiffness coefficient, l represents the spring pre-compression, d represents the limit stroke, t represents time, and x represents the displacement of the mass block in the three-state inertial switch.

[0016] The parameters of the inertial model are set, including the simulation step size and gravitational acceleration;

[0017] The overload information of the warhead of the penetration fuse during the target penetration process is converted into an acceleration load and applied to the inertial model. The mechanical response of the mass block is obtained by simulation, where the mechanical response includes the motion acceleration, velocity and displacement time history of the mass block.

[0018] Furthermore, step S2 includes:

[0019] The mass block and the output electrode are allowed to intersect and deform, and they are in a closed state when they intersect and deform. A collision model is established for the collision between the mass block and the output electrode:

[0020]

[0021] Where K represents the intrusion stiffness coefficient of the electrode, D represents the intrusion damping coefficient of the electrode, and δ u δ represents the displacement of the mass block into the upper electrode. d F represents the displacement of the mass block entering the lower electrode. nu F represents the collision contact force between the mass block and the upper electrode. nd This represents the collision contact force between the mass block and the lower electrode;

[0022] Based on the mechanical response of the mass block, the acceleration, velocity, and displacement of the mass block are used as inputs to the collision model to simulate the intrusion deformation between the mass block and the output electrode. The collision process is solved to obtain the intrusion displacement time history.

[0023] Furthermore, step S3 includes:

[0024] When the mass block and the upper electrode intersect each other, the output of the electromechanical conversion model is 0;

[0025] When the mass block and the lower electrode are interfering with each other, the output is V. cc ;

[0026] When the mass block is detached from the output electrode, the output voltage is 1 / 2V. cc ;

[0027] Then, an electromechanical conversion model for a three-state inertial switch is established:

[0028]

[0029] Using the intrusion displacement time history as the input to the electromechanical conversion model, the simulation step size is set, and the simulation is performed to obtain the voltage output of the electromechanical conversion model, where δ d δ represents the displacement of the lower electrode when the mass block enters. u The displacement of the mass block into the upper electrode is represented by U, and the output of the electromechanical conversion model is V. cc Indicates the power supply voltage;

[0030] The output characteristics of the three-state inertial switch are determined based on the voltage output.

[0031] Furthermore, it also includes: step S4, verifying the correctness of the simulation model using the measured data obtained from the Marshall hammer impact loading test through a three-state inertial switch.

[0032] Furthermore, step S4 specifically includes:

[0033] The artificial cartilage biomimetic material of a preset thickness is fixed onto the support platform;

[0034] A standard accelerometer and a three-state inertial switch are fixed to the head of a Marschach hammer.

[0035] The weight lifts the Marshall hammer to a preset height and then releases it.

[0036] The measured overload signal and the measured output signal of the three-state inertial switch were obtained simultaneously with the impact of the Marshall hammer on the bearing platform.

[0037] The measured overload signal was used as the initial excitation of the simulation model to obtain the simulation output signal of the three-state inertial switch.

[0038] The simulated output signal and the measured output signal of the three-state inertial switch are compared and analyzed, and the correctness of the simulation model is determined based on the analysis results.

[0039] Furthermore, a comparative analysis of the simulated and measured output signals of the three-state inertial switch was conducted, including:

[0040] Compare the signal state transition times in the simulated output signal and the measured output signal of the three-state inertial switch. The signal state transition times include the simulated target landing time, the measured target landing time, the simulated target exit time, the measured target exit time, the simulated stable penetration time, and the measured stable penetration time.

[0041] If the deviation between the simulated output signal and the measured output signal at the signal state transition time is within a preset range, then the simulation model is correct.

[0042] Furthermore, it also includes: step S5, by changing the structural parameters in the three-state inertial switch, the influence of different structural parameters on the simulation output characteristics of the three-state inertial switch is obtained by simulation model.

[0043] Furthermore, step S5 specifically includes:

[0044] Set simulation constraints: The structural parameters of the mechanical simulation model remain unchanged during the simulation process;

[0045] The structural parameters of the mechanical simulation model include the mass of the mass block, stiffness coefficient, damping coefficient, and limit stroke.

[0046] The penetration overload of the projectile penetrating a single-layer thick target is used as the initial excitation input for the simulation model. Through mechanical simulation of the inertial model, the motion acceleration, velocity, and displacement time history of the mass block are obtained.

[0047] Acceleration, velocity, and displacement time histories were used as simulation inputs for the collision model. By changing only the collision parameters in the collision model and performing simulations and analyses, the influence of different structural parameters on the output characteristics of the three-state inertial switch was obtained.

[0048] The present invention has achieved at least the following beneficial effects:

[0049] 1. It can accurately simulate the output characteristics of a three-state inertial switch under different penetration environments;

[0050] 2. It can analyze and understand the influence of different structural parameters on the output characteristics of three-state inertial switches, providing guidance for the design of penetrating fusible three-state inertial switches.

[0051] Other advantages, objectives, and features of the invention will be set forth in the following description and will be apparent to those skilled in the art in some respects, or may be learned by practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0052] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration:

[0053] Figure 1 The flowchart below shows a simulation method for the output characteristics of a three-state inertial switch according to the present invention.

[0054] Figure 2 The measured and simulated output characteristic curves of the three-state inertial switch obtained under the excitation condition of the Marshall hammer are shown.

[0055] Figure 3 This is a schematic diagram of the motion time history curve and output characteristic curve of a mass block during the simulation of a sinusoidal output characteristic. Detailed Implementation

[0056] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0057] The technical solution of this invention is a simulation method for the output characteristics of a three-state inertial switch, referring to... Figures 1 to 3 The three-state inertial switch is a penetration-based three-state inertial switch, consisting of three parts: an inertial system, structural components, and electromechanical conversion elements. The simulation method for the output characteristics of the three-state inertial switch includes the following steps:

[0058] Step S1: Based on the structure of the inertial system in the three-state inertial switch, a mathematical model is established, the material parameters of the system are set, and the overload information of the warhead of the penetration fuse during the target penetration process is converted into acceleration load as the input of the mathematical model. The inertial model is solved by numerical simulation to obtain the mechanical response of the mass block in the three-state inertial switch, namely the acceleration, velocity and displacement time history of the mass block.

[0059] Step S2: When the mass block moves forward to the output electrode, mutual intrusion and collision will occur. Based on the contact relationship between the mass block and the output electrode in the three-state inertial switch, a mathematical model of the collision process is established, and the material parameters and collision parameters involved in the collision process are set. The motion time history of the mass block is used as the initial input condition, and the collision model is solved by numerical simulation to obtain the intrusion displacement time history.

[0060] Step S3: Establish an electromechanical conversion model, take the time history of the intrusion displacement of the mass block and the electrode as the input of the electromechanical conversion model, and simulate to obtain the voltage time history of the output electrode, that is, the output characteristics of the three-state inertial switch;

[0061] Step S4: Verify the correctness of the simulation model using the measured data obtained from the Marshall hammer impact loading test using a three-state inertial switch;

[0062] Step S5: Change the structural parameters in the three-state inertial switch and use a simulation model to simulate the effect of different structural parameters on the simulation output characteristics of the three-state inertial switch.

[0063] The beneficial effects of the above technical solution are: it can accurately simulate the output characteristics of a three-state inertial switch under different penetration environments, and it can analyze and understand the influence of different structural parameters on the output characteristics of the three-state inertial switch, providing guidance for the design of a three-state inertial switch for penetration fuses.

[0064] In one specific embodiment, step S1 is as follows:

[0065] S1.1 The inertial system of the three-state inertial switch includes an upper electrode, a mass block, a spring structure, a lower electrode, and a limiting structure; the mass block and the base limiting structure are connected by the spring structure, the upper electrode is set above the mass block, the upper electrode provides preload to the spring structure, and the base limiting structure supports the mass block and the spring structure and limits the stroke of the mass block.

[0066] The mathematical model of an inertial system is:

[0067]

[0068] S1.2 In the mathematical model of the three-state inertial switch inertial system, m represents the mass of the mass block, c represents the damping coefficient, k represents the stiffness coefficient, l represents the spring pre-compression, d represents the limit stroke, t represents time, and x represents the displacement of the mass block in the three-state inertial switch; the acceleration, velocity, and displacement of the mass block correspond to... x.

[0069] S1.3 Set the parameters of the mathematical model of the inertial system, with a simulation step size of 10 ns and a gravitational acceleration of 9.80665 m / s2.

[0070] S1.4 The overload information of the warhead of the penetration fuse during the target penetration process is converted into an acceleration load and applied to the three-dimensional mechanical simulation model. The mechanical response of the mass block is obtained by simulation, namely the acceleration time history, velocity time history and displacement time history of the mass block.

[0071] In one specific embodiment, step S2 is as follows:

[0072] S2.1 The mass block and the output electrode can undergo mutual intrusion deformation. When intrusion deformation occurs, the mass block and the output electrode are in a closed state. The mathematical model for the collision between the mass block and the output electrode is:

[0073]

[0074] S2.2, Set the material parameters for the collision mathematical model, including setting K to represent the electrode's intrusion stiffness coefficient, D to represent the electrode's intrusion damping coefficient, and δ... u δ represents the displacement of the mass block into the upper electrode. d F represents the displacement of the mass block entering the lower electrode. nu F represents the collision contact force between the mass block and the upper electrode. nd This represents the collision contact force between the mass block and the lower electrode;

[0075] S2.3. Using the acceleration, velocity, and displacement of the mass block as inputs to the collision model, simulate the intrusion deformation between the mass block and the output electrode, and solve the collision process. The solution steps include: First, using the mechanical response of the inertial system, including the acceleration, velocity, and displacement time histories of the mass block as inputs to the collision model, setting the simulation step size to 10 ns, and simulating the intrusion displacement time histories.

[0076] In one specific embodiment, step 3 is as follows:

[0077] S3.1 In the electromechanical conversion model of the three-state inertial switch, when the mass block and the upper electrode intersect each other, the output of the electromechanical conversion model is 0; when the mass block and the lower electrode intersect each other, the output is V. cc When the mass block is detached from the output electrode, the output voltage is 1 / 2V. cc The mathematical model for electromechanical conversion is:

[0078]

[0079] Where δ d δ represents the displacement of the lower electrode when the mass block enters. u The displacement of the mass block into the upper electrode is represented by U, and the output of the electromechanical conversion model is V. cc Indicates the power supply voltage;

[0080] S3.2. Using the intrusion displacement time history as the input to the electromechanical conversion model, and setting the simulation step size to 10ns, the voltage output of the electromechanical conversion model, i.e., the output characteristics of the three-state inertial switch, is obtained through simulation.

[0081] In one specific embodiment, refer to Figure 2 Step 4 specifically involves:

[0082] S4.1 Verify the correctness of the simulation model using the Marshall hammer test. Fix a 20mm thick artificial cartilage biomimetic material to the support platform. Fix a standard accelerometer and a three-state inertial switch to the head of the Marshall hammer. Lift the Marshall hammer to 23 feet with a heavy object and release it. The Marshall hammer impacts the support platform. At the same time, obtain the measured overload signal and the measured output signal of the three-state inertial switch.

[0083] S4.2. Using the measured overload signal as the initial excitation of the simulation model, the simulation output signal of the three-state inertial switch is obtained.

[0084] S4.3 Analyze the simulated output signal and the measured output signal of the three-state inertial switch, and compare the state transition times of the two signals, including the simulated target landing time, the measured target landing time, the simulated target exit time and the measured target exit time, the simulated stable penetration time and the measured stable penetration time.

[0085] If the deviation between the simulation time and the actual measurement time is within the set range, then the simulation model is correct.

[0086] In one specific embodiment, step S5 is as follows:

[0087] S5.1 Setting simulation conditions: Without changing the structural parameters of the mechanical simulation model, including the mass m of the mass block, stiffness coefficient k, damping coefficient c, and limit stroke d, the penetration overload when the projectile penetrates a single-layer thick target is used as the initial excitation of the simulation model.

[0088] S5.2. Using the above-mentioned penetration overload as input, the motion acceleration, velocity, and displacement time history of the mass block are obtained through mechanical simulation of the inertial system.

[0089] S5.3. Using the above acceleration, velocity, and displacement time histories as simulation inputs for the collision model, only the collision parameters in the collision model are changed. That is, under the given penetration overload condition, the kinematic output of the three-state inertial switch inertial system is constant, and only the penetration velocity, penetration displacement time histories, and the output characteristics of the sensor conversion element are changed; analyze the influence of different structural parameters on the output characteristics of the three-state inertial switch.

[0090] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A method for simulating the output characteristics of a three-state inertial switch, characterized in that, include: Step S1: Based on the structure of the inertial system in the three-state inertial switch, establish an inertial model and perform simulation to obtain the mechanical response of the mass block in the three-state inertial switch; Step S2: Based on the contact relationship between the mass block and the output electrode in the three-state inertial switch, establish a collision model of the collision process of the mass block rushing to the output electrode and perform simulation to obtain the intrusion displacement time history. Step S3: Establish an electromechanical conversion model and use the time history of the intrusion displacement of the mass block and the electrode as the input of the electromechanical conversion model. Simulate the electromechanical conversion model to obtain the voltage time history of the output electrode as the output characteristic of the three-state inertial switch. Step S1 includes: Based on the structure of the inertial system in a three-state inertial switch, the following inertial model is established: in, Indicates the mass of the mass block. Indicates the damping coefficient. Indicates the stiffness coefficient. Indicates the spring pre-compression amount. Indicates the limit travel distance. Indicates time, This represents the displacement of the mass block in the three-state inertial switch. The parameters of the inertial model are set, including the simulation step size and gravitational acceleration; The overload information of the warhead of the penetration fuse during the target penetration process is converted into an acceleration load and applied to the inertial model. The mechanical response of the mass block is obtained by simulation, where the mechanical response includes the motion acceleration, velocity and displacement time history of the mass block. Step S2 includes: The mass block and the output electrode are allowed to intersect and deform, and they are in a closed state when they intersect and deform. A collision model is established for the collision between the mass block and the output electrode: in, This represents the intrusion stiffness coefficient of the electrode. This indicates the intrusion damping coefficient of the electrode. This indicates the displacement of the mass block into the upper electrode. This indicates the displacement of the mass block as it penetrates the lower electrode. This represents the collision contact force between the mass block and the upper electrode. This represents the collision contact force between the mass block and the lower electrode; Based on the mechanical response of the mass block, the motion acceleration, velocity, and displacement of the mass block are used as inputs to the collision model to simulate the intrusion deformation between the mass block and the output electrode. The collision process is solved to obtain the intrusion displacement time history. Step S3 includes: When the mass block and the upper electrode intersect each other, the output of the electromechanical conversion model is 0; When the mass block and the lower electrode intersect, the output is: ; When the mass block is detached from the output electrode, the output voltage is 1 / 2. ; Then, an electromechanical conversion model for a three-state inertial switch is established: The intrusion displacement time history is used as the input to the electromechanical conversion model. The simulation step size is set, and the simulation is performed to obtain the voltage output of the electromechanical conversion model. This indicates the displacement of the mass block as it penetrates the lower electrode. This indicates the displacement of the mass block into the upper electrode. This represents the output of the electromechanical conversion model. Indicates the power supply voltage; The output characteristics of the three-state inertial switch are determined based on the voltage output.

2. The simulation method for the output characteristics of a three-state inertial switch according to claim 1, characterized in that, It also includes: step S4, verifying the correctness of the simulation model using the measured data obtained from the Marshall hammer impact loading test through a three-state inertial switch.

3. The simulation method for the output characteristics of a three-state inertial switch according to claim 2, characterized in that, Step S4 specifically includes: The artificial cartilage biomimetic material of a preset thickness is fixed onto the support platform; A standard accelerometer and a three-state inertial switch are fixed to the head of a Marschach hammer. The weight lifts the Marshall hammer to a preset height and then releases it. The measured overload signal and the measured output signal of the three-state inertial switch were obtained simultaneously with the impact of the Marshall hammer on the bearing platform. The measured overload signal was used as the initial excitation of the simulation model to obtain the simulation output signal of the three-state inertial switch. The simulated output signal and the measured output signal of the three-state inertial switch are compared and analyzed, and the correctness of the simulation model is determined based on the analysis results.

4. The simulation method for the output characteristics of a three-state inertial switch according to claim 3, characterized in that, The comparative analysis of the simulated output signal and the measured output signal of the three-state inertial switch includes: Compare the signal state transition times in the simulated output signal and the measured output signal of the three-state inertial switch. The signal state transition times include the simulated target landing time, the measured target landing time, the simulated target exit time, the measured target exit time, the simulated stable penetration time, and the measured stable penetration time. If the deviation between the simulated output signal and the measured output signal at the signal state transition time is within a preset range, then the simulation model is correct.

5. The simulation method for the output characteristics of a three-state inertial switch according to claim 1, characterized in that, It also includes: step S5, by changing the structural parameters in the three-state inertial switch, the effect of different structural parameters on the simulation output characteristics of the three-state inertial switch is obtained by simulation model.

6. The simulation method for the output characteristics of a three-state inertial switch according to claim 5, characterized in that, Step S5 specifically includes: Set simulation constraints: The structural parameters of the mechanical simulation model remain unchanged during the simulation process; The structural parameters of the mechanical simulation model include the mass of the mass block, stiffness coefficient, damping coefficient, and limit stroke. The penetration overload of the projectile penetrating a single-layer thick target is used as the initial excitation input for the simulation model. Through mechanical simulation of the inertial model, the motion acceleration, velocity, and displacement time history of the mass block are obtained. Acceleration, velocity, and displacement time histories were used as simulation inputs for the collision model. By changing only the collision parameters in the collision model and performing simulations and analyses, the influence of different structural parameters on the output characteristics of the three-state inertial switch was obtained.

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