Honeycomb aluminum replacement device for neck calibration based on hydraulic control and control method thereof

Abstract

The invention relates to a honeycomb aluminum replacement device for neck calibration based on hydraulic control. The honeycomb aluminum replacement device comprises a hydraulic supply module, a core speed reduction module and a system control module. The hydraulic supply module provides hydraulic pressure for the core speed reduction module; the core speed reduction module comprises a buffer block structure, a hydraulic main cylinder, an oil inlet linear electromagnetic valve, an oil outlet linear electromagnetic valve, a pressure sensor and a displacement sensor, the end of a piston rod of the hydraulic main cylinder is connected with the buffer block structure, an oil inlet pipeline of the hydraulic main cylinder is provided with the oil inlet linear electromagnetic valve, and an oil outlet pipeline of the hydraulic main cylinder is provided with the oil outlet linear electromagnetic valve. A cylinder body of the hydraulic main cylinder is provided with a pressure sensor, and the hydraulic main cylinder is provided with a displacement sensor used for detecting piston displacement. The oil inlet linear electromagnetic valve, the oil outlet linear electromagnetic valve and the pressure sensor are all connected to the system control module. According to the honeycomb aluminum replacement device for neck calibration based on hydraulic control and the control method of the honeycomb aluminum replacement device, the neck calibration accuracy in mechanical damage performance can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile collision safety, and in particular to a honeycomb aluminum replacement device for neck calibration based on hydraulic control and a control method thereof. Background Art

[0002] According to national standards and product technical manuals, the mechanical damage performance of each component assembly structure of the automobile crash test dummy should be tested and verified using a setting similar to the human test method. If each indicator is within the range of the human injury biomechanical test results of the corresponding human body part, it is considered that the crash test dummy component meets the biofidelity requirements of mechanical damage performance.

[0003] During the development and verification phase and use cycle of automobile collision test dummy products, it is necessary to calibrate the mechanical damage performance of the corresponding parts of the dummy according to the industry's requirements for the biological fidelity of the dummy parts. Calibration tests can be performed under a single specific loading condition, or calibration tests under multiple loading conditions. Neck calibration is an important link. Dummy neck calibration is generally divided into neck flexion calibration test, extension calibration test and lateral flexion calibration test. In the calibration test, the rigid impactor needs to be accelerated to a specific speed through a driving device, and the impact on the honeycomb aluminum is to achieve a specified deceleration waveform to test the dummy neck-related forces and torques. It can be seen that honeycomb aluminum plays an important role in calibration tests, and its material and shape characteristics may affect the deceleration waveform characteristics of the impactor. However, most of the existing methods are manual cutting of honeycomb aluminum, which is time-consuming, labor-intensive and cannot guarantee product consistency. Developing an impactor intelligent deceleration system that can simulate the deceleration characteristics of honeycomb aluminum on rigid impactors and ensure test repeatability will help solve this problem. Domestic research teams' research on dummy neck calibration equipment is mostly focused on the improved design of neck safety tooling and the development of the overall test bench, and lacks research on the swing arm deceleration control. ATD labtech, a foreign company, has developed a pendulum deceleration control system "Pendulum Deceleration Control" based on air pressure shock absorption, which can achieve deceleration simulation within the range of all types of ATD calibration requirements. However, due to the compressibility of air, pneumatic systems may not be as efficient as hydraulic systems in terms of energy transmission, and pneumatic systems are more sensitive to ambient temperature and humidity, which may affect performance. The hydraulic system benefits from the incompressibility of the liquid for more precise speed and force control, and the high energy density of the hydraulic system means that more energy can be stored in a smaller space. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a honeycomb aluminum replacement device for neck calibration based on hydraulic control, using a buffer device based on an intelligent hydraulic control system instead of honeycomb aluminum to achieve deceleration and buffering of the swing arm in the dummy neck calibration device, thereby achieving stable control and free adjustment of the swing arm deceleration, and avoiding the hidden dangers of inconsistent shape and unstable performance of manually cut honeycomb aluminum.

[0005] The present invention also aims to provide a control method for a honeycomb aluminum replacement device for neck calibration based on hydraulic control.

[0006] The present invention solves the technical problem by the following technical solutions:

[0007] A honeycomb aluminum replacement device for neck calibration based on hydraulic control, comprising a hydraulic supply module, a core deceleration module and a system control module; the hydraulic supply module provides hydraulic pressure for the core deceleration module; the core deceleration module comprises a buffer block structure, a hydraulic master cylinder, an oil inlet linear solenoid valve, an oil outlet linear solenoid valve, a pressure sensor, and a displacement sensor; the piston rod end of the hydraulic master cylinder is connected to the buffer block structure, the oil inlet pipeline of the hydraulic master cylinder is provided with an oil inlet linear solenoid valve, the oil outlet pipeline of the hydraulic master cylinder is provided with an oil outlet linear solenoid valve, the cylinder body of the hydraulic master cylinder is provided with a pressure sensor, and the hydraulic master cylinder is provided with a displacement sensor for detecting piston displacement; the oil inlet linear solenoid valve, the oil outlet linear solenoid valve, and the pressure sensor are all connected to the system control module.

[0008] Moreover, the hydraulic supply module includes an oil cup, a high-pressure accumulator, a motor hydraulic pump, and corresponding connecting pipelines, and the connecting pipelines include an oil inlet pipeline and an oil outlet pipeline; the oil cup is connected to the motor hydraulic pump via the oil inlet pipeline, the motor hydraulic pump is connected to the high-pressure accumulator, and is connected to the oil inlet of the hydraulic master cylinder after the pressure is stabilized by the high-pressure accumulator; the oil outlet of the hydraulic master cylinder is connected to the oil return cup via the oil outlet pipeline.

[0009] Moreover, the system control module includes an input / output (I / O) module, a control algorithm module, a communication module, a data recording and storage module, and a system diagnosis and safety module; when the swing arm is released and dropped, the system control module monitors the hydraulic pressure changes and piston displacement in the hydraulic master cylinder in real time. After contacting the impact block of the buffer device, the system calculates the reference pressure in the hydraulic master cylinder at each moment according to the preset relationship curve between the hydraulic master cylinder hydraulic pressure and the piston stroke, and then compares it with the actual measurement value of the pressure sensor. By adjusting the opening of the oil inlet linear solenoid valve and the oil outlet linear solenoid valve in real time, the pressure in the hydraulic master cylinder can quickly track the reference hydraulic pressure value, thereby helping to achieve the target swing arm deceleration waveform.

[0010] A control method for a honeycomb aluminum replacement device for neck calibration based on hydraulic control, the control method comprising the following steps:

[0011] Step 1: Start the hydraulic supply module to ensure that the oil cup, high-pressure accumulator, motor hydraulic pump, hydraulic oil and connecting pipelines are working properly. Initialize the system control module to ensure that the pressure sensor, displacement sensor, oil inlet linear solenoid valve, oil outlet linear solenoid valve and motor hydraulic pump are in working condition.

[0012] Step 2: When the swing arm is released and falls, the pressure sensor and displacement sensor monitor the pressure and piston displacement in the hydraulic master cylinder in real time, and the system starts working;

[0013] Step 3: After the swing arm contacts the impact block of the buffer device, the system calculates the reference pressure value at the current moment according to the preset relationship curve between the hydraulic master cylinder pressure and the piston stroke;

[0014] Step 4: The system compares the reference pressure with the actual measured value, and the system control module adjusts the opening of the inlet / outlet oil solenoid valve to ensure that the pressure in the hydraulic master cylinder quickly tracks the reference pressure;

[0015] Step 5: Through precise adjustment of the hydraulic pressure, the system achieves the target deceleration waveform of the swing arm, ensuring the stability and accuracy of the dummy neck calibration process;

[0016] Step 6: The system records and stores sensor data in real time, monitors the operating status of the equipment, and executes safety measures when an abnormality is encountered.

[0017] The specific implementation method of ensuring that the pressure in the hydraulic master cylinder quickly tracks the reference pressure in step 4 is:

[0018] Step A: Model the actual problem and make it clear that the state variables of the system include the hydraulic pressure P(t) in the hydraulic master cylinder and the compression stroke S(t) of the hydraulic master cylinder piston. The control input of the system includes the current i of the inlet solenoid valve that controls the inlet amount. in (t), the current i of the liquid outlet solenoid valve that controls the liquid outlet out (t), the dynamics of the hydraulic system can be described by the following differential equation:

[0019]

[0020] Step B: Since MPC is based on a discrete time model, the dynamic equations of the hydraulic system need to be discretized with a time step of T s , the discrete state space model is:

[0021] X[k+1]=AX[k]+BU[k]+Ed[k]

[0022] Where: X[k] is the state vector, U[k] is the control input, d[k] is the disturbance term, A is the system dynamic matrix, B is the control term coefficient matrix, and E is the disturbance term coefficient matrix.

[0023] Step C: The goal is to make the pressure P(t) track the target pressure P ref (t), the cost function is defined in the time domain Np as:

[0024]

[0025] Step D: Set constraints based on actual system characteristics to control the physical limits of the input:

[0026] U min ≤U[k]≤U max

[0027] The state limits of the pressure and stroke of the hydraulic buffer master cylinder are:

[0028] P min ≤P[k]≤P max

[0029] S min ≤S[k]≤S max

[0030] Among them, U min , U max Indicates the minimum and maximum limits of the input, P min , P max , S min , S max Indicates the minimum and maximum limits of the pressure and stroke of the master cylinder;

[0031] Step E: Transform into solving optimization problem. For each sampling time k, MPC obtains the optimal control input by solving the following constrained optimization problem:

[0032] min J(u)

[0033] subject to:

[0034] X[k+1]=AX[k]+BU[k]+Ed[k]

[0035] U min ≤U[k]≤U max

[0036] P min ≤P[k]≤P max

[0037] Step F: Implement the calculated optimal control input into the system to adjust the operation of the oil inlet and outlet solenoid valves to achieve the desired pressure control effect.

[0038] The beneficial effects of the present invention are:

[0039] 1. The honeycomb aluminum replacement device for neck calibration based on hydraulic control and the control method thereof of the present invention use a buffer device based on an intelligent hydraulic control system instead of honeycomb aluminum to achieve deceleration and buffering of the swing arm in the dummy neck calibration device, thereby achieving stable control and free adjustment of the swing arm deceleration, and avoiding the hidden dangers of inconsistent shape and unstable performance of manually cut honeycomb aluminum. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the system structure;

[0041] Figure 2 This is the internal module diagram of the system control unit;

[0042] Figure 3 It is the system control flow chart;

[0043] Figure 4 This is a schematic diagram of the tracking effect based on the MPC algorithm;

[0044] Figure 5 for Figure 4 Partial magnification Figure 1 ;

[0045] Figure 6 for Figure 4 Another partial enlargement of .

[0046] Description of Reference Numerals

[0047] 101-oil cup, 102-high-pressure accumulator, 103-motor hydraulic pump, 104-oil outlet pipeline, 105-oil inlet pipeline, 201-buffer block structure, 202-hydraulic master cylinder, 203-oil inlet linear solenoid valve, 204-oil outlet linear solenoid valve, 205-pressure sensor, 206-displacement sensor, 301-input / output (I / O) module, 302-control algorithm module, 303-communication module, 304-data recording and storage module, 305-system diagnosis and safety module. DETAILED DESCRIPTION

[0048] The present invention is further described in detail below through specific examples. The following examples are only illustrative and not restrictive, and the protection scope of the present invention cannot be limited thereto.

[0049] A honeycomb aluminum replacement device for neck calibration based on hydraulic control, such as Figure 1 , Figure 2 , Figure 3As shown, it includes a hydraulic supply module, a core deceleration module and a system control module; the hydraulic supply module provides hydraulic pressure for the core deceleration module; the core deceleration module includes a buffer block structure 201, a hydraulic master cylinder 202, an oil inlet linear solenoid valve 203, an oil outlet linear solenoid valve 204, a pressure sensor 205, and a displacement sensor 206. The piston rod end of the hydraulic master cylinder 202 is fixedly connected to the buffer block structure 201, the oil inlet pipeline 105 of the hydraulic master cylinder 202 is provided with an oil inlet linear solenoid valve 203, and the oil outlet pipeline 104 of the hydraulic master cylinder 202 is provided with an oil outlet linear solenoid valve 204. A pressure sensor 205 is provided on the cylinder body of the hydraulic master cylinder 202. The pressure sensor 205 monitors the pressure in the hydraulic master cylinder 202 in real time. A displacement sensor 206 is provided on the end of the piston rod of the hydraulic master cylinder 202. The displacement sensor 206 adopts a photoelectric sensor. A photoelectric sensor transmitting end is provided on the end of the piston rod, and a photoelectric sensor receiving end is provided on the outside of the cylinder body of the hydraulic master cylinder. The displacement sensor 206 monitors the displacement of the piston rod of the hydraulic master cylinder 202 in real time. The oil inlet linear solenoid valve 203, the oil outlet linear solenoid valve 204, and the pressure sensor 205 are all connected to the system control module.

[0050] The hydraulic supply module includes an oil cup 101, a high-pressure accumulator 102, a motor hydraulic pump 103 and corresponding connecting pipelines, and the connecting pipelines include an oil inlet pipeline 105, an oil outlet pipeline 104, etc.; the oil outlet of the oil cup 101 is connected to the motor hydraulic pump 103 via the oil inlet pipeline 105, and the oil outlet of the motor hydraulic pump 103 is connected to the oil inlet of the high-pressure accumulator 102. After the pressure is stabilized by the high-pressure accumulator 102, the oil outlet of the high-pressure accumulator 102 is connected to the oil inlet of the hydraulic master cylinder 202; the oil outlet of the hydraulic master cylinder 202 is connected back to the oil cup 101 via the oil outlet pipeline 104.

[0051] The system control module includes an input / output (I / O) module 301 , a control algorithm module 302 , a communication module 303 , a data recording and storage module 304 , and a system diagnosis and safety module 305 .

[0052] The roles and functions of the input / output (I / O) module 301, the control algorithm module 302, the communication module 303, the data recording and storage module 304, and the system diagnosis and safety module 305 are as follows:

[0053] Input / output (I / O) module 301: Responsible for receiving and processing input data from pressure sensors and displacement sensors, and sending output signals to actuators. This module is responsible for the conversion between analog signals and digital signals, ensuring that information is correctly transmitted between the system control module content and other external devices.

[0054] Control algorithm module 302: Based on the received input data, it executes a predetermined algorithm to control the behavior of the system equipment. This module processes the input data and calculates the corresponding control instructions according to the control logic to achieve the expected functions and performance of the system.

[0055] Communication module 303: manages data communication between the system and other external devices, ensures smooth data exchange and synchronization, and handles security issues of network connection and data transmission.

[0056] Data recording and storage module 304: records and saves all data generated during system operation. By persistently storing operation data and historical records, this module ensures that data will not be lost in the event of power failure or other abnormal conditions, for subsequent analysis or backup.

[0057] System Diagnosis and Security Module 305: monitors the health of the system and performs security-related functions. This module detects system operation status and potential failures in real time, performs fault diagnosis and recovery operations, and maintains system security, including implementing access control and encryption measures.

[0058] When the swing arm is released and dropped, the system control module monitors the changes in the hydraulic pressure and piston displacement in the hydraulic master cylinder 202 in real time, and transmits them to the control algorithm module 302 through the input / output (I / O) module 301; after the buffer block structure 201 of the core deceleration module contacts the impact block of the buffer device, the system calculates the reference pressure in the hydraulic master cylinder 202 at each moment according to the preset relationship curve between the hydraulic master cylinder 202 liquid pressure and the piston stroke, and then compares it with the actual measured value of the pressure sensor 205, and adjusts the opening of the oil inlet linear solenoid valve 203 and the oil outlet linear solenoid valve 204 in real time, so that the pressure in the hydraulic master cylinder 202 can quickly track the reference liquid pressure value, thereby helping to achieve the target swing arm deceleration waveform.

[0059] A control method for a honeycomb aluminum replacement device for neck calibration based on hydraulic control, the control method comprising the following steps:

[0060] Step 1: The hydraulic supply module is started to ensure that the oil cup 101, the high-pressure accumulator 102, the motor hydraulic pump 103, the hydraulic oil and the connecting pipelines are working properly, and the system control module is initialized to ensure that the pressure sensor 205, the displacement sensor 206, the oil inlet linear solenoid valve 203, the oil outlet linear solenoid valve 204 and the motor hydraulic pump 103 are in working condition;

[0061] Step 2: When the swing arm is released and falls, the pressure sensor 205 and the displacement sensor 206 monitor the pressure and piston displacement in the hydraulic master cylinder 202 in real time, and the system starts to work;

[0062] Step 3: After the swing arm contacts the impact block of the buffer device, the system calculates the reference pressure value at the current moment according to the preset relationship curve between the pressure and piston stroke of the hydraulic master cylinder 202;

[0063] Step 4: The system compares the reference pressure with the actual measured value, and the system control module ensures that the pressure in the hydraulic master cylinder 202 quickly tracks the reference pressure by adjusting the opening of the inlet / outlet oil solenoid valve;

[0064] Step 5: Through precise adjustment of the hydraulic pressure, the system achieves the target deceleration waveform of the swing arm, ensuring the stability and accuracy of the dummy neck calibration process;

[0065] Step 6: The system records and stores sensor data in real time, monitors the operating status of the equipment, and executes safety measures when an abnormality is encountered.

[0066] The specific implementation method of calculating the reference pressure value at the current moment according to the preset relationship curve between the pressure and piston stroke of the hydraulic master cylinder 202 in step 3 is:

[0067] When the swing arm falls and hits the system buffer impact block, the system displacement sensor and the master cylinder pressure sensor record the displacement change of the buffer block in real time and transmit the information to the system control module. The system control module compares the current piston displacement and real-time pressure information with the preset reference piston displacement and master cylinder pressure data to perform subsequent control actions. Among them, due to the size and structure limitations of the hydraulic master cylinder, when controlling the deceleration of the swing arm, it is necessary to complete the buffering of the impact within the working stroke of the hydraulic master cylinder according to the deceleration requirements of the test task. Therefore, the reference pressure-piston stroke relationship curve is obtained through a large number of tests based on different deceleration requirements. From different inlet and outlet solenoid valve opening control methods, the ideal control mode and reference hydraulic pressure-displacement curve that meet the swing arm deceleration requirements are obtained.

[0068] The specific implementation method of ensuring that the pressure in the hydraulic master cylinder 202 quickly tracks the reference pressure in step 4 is:

[0069] Considering that the system needs to control the hydraulic pressure of the hydraulic buffer master cylinder in real time according to the calibration requirements, and the hydraulic system has nonlinear and complex dynamic characteristics, the MPC (model predictive control) algorithm is introduced to adapt to the complex control requirements of the system. The MPC algorithm realizes pressure tracking by predicting future states and control inputs. Combined with the model, constraints and optimization goals, it can well adjust the opening of the inlet and outlet solenoid valves to achieve the goal of controlling the pressure of the hydraulic master cylinder 202. The basic process of the MPC algorithm is to predict the state at several moments in the future based on the dynamic model of the system, and optimize the future control input so that the predicted state can be as close to the set target as possible, while satisfying the constraints of the control input and state. The control process based on the MPC algorithm includes the following steps:

[0070] Step ①: Model the actual problem, and make it clear that the state variables of the system include the hydraulic pressure P(t) in the master cylinder and the compression stroke S(t) of the master cylinder. The control input of the system includes the current i(t) of the solenoid valve that controls the amount of oil in and out (the current i of the inlet solenoid valve is in (t), the current i of the liquid outlet solenoid valve out (t)), the valve core displacement of the solenoid valve x(t) (the valve core displacement of the inlet solenoid valve x in (t), valve core displacement x of the outlet solenoid valve out (t)), the flow rate through the solenoid valve Q(t) (the valve core displacement of the inlet solenoid valve Q in (t), valve core displacement Q of the liquid outlet solenoid valve out (t)), C d is the flow coefficient, A(x(t)) is the opening area (a function of the valve core displacement), ΔP(t) is the pressure difference before and after the valve, ρ is the density of the oil, and k e is a constant related to the coil structure, m is the mass of the valve core, b is the damping coefficient, k s is the spring stiffness, V is the volume of the hydraulic oil, C t is the leakage coefficient of the system.

[0071] The dynamics of the hydraulic system can be described by the following differential equation:

[0072]

[0073] Introducing the linear solenoid valve model, the dynamic relationship between the displacement of a single valve core and the input current is:

[0074]

[0075] The flow rate through the valve is:

[0076]

[0077] Among them, ΔP(t) of the inlet solenoid valve is the pressure P of the high-pressure accumulator 102 sup The ΔP(t) of the outlet solenoid valve is the difference between the main cylinder pressure P(t) and the oil cup pressure P yb The difference.

[0078] Then the hydraulic pressure equation of the main cylinder of the system with two linear solenoid valves for inlet and outlet liquid can be rewritten as:

[0079]

[0080] Step ②: Since MPC is based on a discrete time model, the dynamic equations of the hydraulic system need to be discretized, with a time step of Ts. The discrete state space model is generally:

[0081] X[k+1]=AX[k]+BU[k]+Ed[k]

[0082] Where: X[k] is the state vector, U[k] is the control input, d[k] is the disturbance term, A is the system dynamic matrix, B is the control term coefficient matrix, and E is the disturbance term coefficient matrix.

[0083] In one embodiment, the forward Euler method is used for discretization, and the discretized model is:

[0084]

[0085] Among them, adjustment factors α and β are added to the inlet and outlet flow equations to compensate for model inaccuracies and external disturbances. They are adjustable parameters and can be optimized according to the actual system performance.

[0086] Step 3: The goal is to make the pressure P(t) track the target pressure P ref (t), the cost function is defined as:

[0087]

[0088] Step ④: Set constraints based on actual system characteristics to control the physical limitations of input:

[0089] U min ≤U[k]≤U max

[0090] The state limits of the pressure and stroke of the hydraulic buffer master cylinder are:

[0091] P min ≤P[k]≤P max

[0092] S min ≤S[k]≤S max

[0093] Among them, U min , U max Indicates the minimum and maximum limits of the input, P min , P max , S min , S max Indicates the minimum and maximum limits for pressure and stroke of the master cylinder.

[0094] Step 5: Transform into solving optimization problem. For each sampling time k, MPC obtains the optimal control input by solving the following constrained optimization problem:

[0095] min J(u)

[0096] subject to:

[0097] X[k+1]=AX[k]+BU[k]+Ed[k]

[0098] U min ≤U[k]≤U max

[0099] P min ≤P[k]≤P max

[0100] Step ⑥: Implement the calculated optimal control input into the system to adjust the operation of the oil inlet and outlet solenoid valves to achieve the desired pressure control effect. At each control step, collect the actual response and state update of the system to provide data support for the optimization of the next control cycle. This MPC framework can effectively handle the complex dynamics of multi-input systems, optimize control performance, and improve the accuracy and stability of system responses.

[0101] In one embodiment, a given target curve is tracked and controlled based on the MPC control strategy. The target curve and the tracking curve are as follows: Figure 4 , Figure 5 , Figure 6 As shown in the figure, for a given target pressure curve, this method has a slight hysteresis and deviation in the tracking control when the target value changes dynamically, but when tracking the stable target value, its overshoot is small and it can reach a stable state quickly.

[0102] Referring to the calibration specifications and requirements, in order to meet the task requirements of calibration of various scenarios, the technical goals of the system are shown in Table 1:

[0103] Table 1 Technical objectives of this embodiment

[0104] Parameter name Parameter Value Maximum deceleration force available 10000N Maximum swing arm speed 7.5m / s Maximum deceleration available 35g System shock absorption repeatability error limit 0.1g Maximum stroke of master cylinder piston 300mm Position sensor accuracy 0.1mm

[0105] When designing and selecting actual system components and debugging system functions, the above technical parameters are used as the target for actual work.

[0106] Step 5 above: Through steps 3 and 4, the system monitors the hydraulic buffer master cylinder fluid pressure and piston displacement in real time, and calculates the equivalent swing arm deceleration data; compares the current fluid pressure, piston displacement and deceleration changes with the reference values ​​in real time, and flexibly adjusts the opening of the inlet and outlet solenoid valves to accurately adjust the hydraulic pressure when the control system error threshold is exceeded, so as to achieve the target deceleration requirement of the swing arm and ensure the compliance and stability of the dummy neck calibration test.

[0107] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A honeycomb aluminum replacement device for neck calibration based on hydraulic control, characterized in that: The invention comprises a hydraulic supply module, a core deceleration module and a system control module; the hydraulic supply module provides hydraulic pressure for the core deceleration module; the core deceleration module comprises a buffer block structure (201), a hydraulic master cylinder (202), an oil inlet linear solenoid valve (203), an oil outlet linear solenoid valve (204), a pressure sensor (205), and a displacement sensor (206); the piston rod end of the hydraulic master cylinder (202) is connected to the buffer block structure (201); the oil inlet pipeline (105) of the hydraulic master cylinder (202) is arranged An oil inlet linear solenoid valve (203) is provided, and an oil outlet linear solenoid valve (204) is provided on the oil outlet pipeline (104) of the hydraulic master cylinder (202). A pressure sensor (205) is provided on the cylinder body of the hydraulic master cylinder (202) for monitoring the pressure in the hydraulic master cylinder (202). The hydraulic master cylinder (202) is provided with a displacement sensor (206) for detecting the displacement of the piston. The oil inlet linear solenoid valve (203), the oil outlet linear solenoid valve (204), and the pressure sensor (205) are all connected to the system control module.

2. The honeycomb aluminum replacement device for neck calibration based on hydraulic control according to claim 1 is characterized in that: The hydraulic supply module comprises an oil cup (101), a high-pressure accumulator (102), a motor hydraulic pump (103), and corresponding connecting pipelines, wherein the connecting pipelines comprise an oil inlet pipeline (105) and an oil outlet pipeline (104); the oil cup (101) is connected to the motor hydraulic pump (103) via the oil inlet pipeline (105), the motor hydraulic pump (103) is connected to the high-pressure accumulator (102), and after the pressure is stabilized by the high-pressure accumulator (102), it is connected to the oil inlet of the hydraulic master cylinder (202); the oil outlet of the hydraulic master cylinder (202) is connected to the oil return cup (101) via the oil outlet pipeline (104).

3. The honeycomb aluminum replacement device for neck calibration based on hydraulic control according to claim 1 is characterized in that: The system control module comprises an input / output (I / O) module (301), a control algorithm module (302), a communication module (303), a data recording and storage module (304), and a system diagnosis and safety module (305); when the swing arm is released and falls, the system control module monitors the hydraulic pressure change and piston displacement in the hydraulic master cylinder (202) in real time. After contacting the impact block of the buffer device, the system calculates the reference pressure in the hydraulic master cylinder (202) at each moment according to a preset relationship curve between the hydraulic pressure and the piston stroke of the hydraulic master cylinder (202), and then compares it with the actual measurement value of the pressure sensor (205). By adjusting the opening of the oil inlet linear solenoid valve (203) and the oil outlet linear solenoid valve (204) in real time, the pressure in the hydraulic master cylinder (202) quickly tracks the reference hydraulic pressure value, thereby helping to achieve the target swing arm deceleration waveform.

4. A control method for a honeycomb aluminum replacement device for neck calibration based on hydraulic control according to any one of claims 1 to 3, characterized in that: The control method comprises the following steps: Step 1: The hydraulic supply module is started to ensure that the oil cup (101), the high-pressure accumulator (102), the motor hydraulic pump (103), the hydraulic oil and the connecting pipelines are working properly, and the system control module is initialized to ensure that the pressure sensor (205), the displacement sensor (206), the oil inlet linear solenoid valve (203), the oil outlet linear solenoid valve (204) and the motor hydraulic pump (103) are in working condition; Step 2: When the swing arm is released and falls, the pressure sensor (205) and the displacement sensor (206) monitor the pressure and piston displacement in the hydraulic master cylinder (202) in real time, and the system starts to work; Step 3: After the swing arm contacts the impact block of the buffer device, the system calculates the reference pressure value at the current moment according to the preset relationship curve between the pressure and the piston stroke of the hydraulic master cylinder (202); Step 4: The system compares the reference pressure with the actual measured value, and the system control module adjusts the opening of the inlet / outlet oil solenoid valve to ensure that the pressure in the hydraulic master cylinder (202) quickly tracks the reference pressure; Step 5: Through precise adjustment of the hydraulic pressure, the system achieves the target deceleration waveform of the swing arm, ensuring the stability and accuracy of the dummy neck calibration process; Step 6: The system records and stores sensor data in real time, monitors the operating status of the equipment, and executes safety measures when an abnormality is encountered.

5. The control method of the honeycomb aluminum replacement device for neck calibration based on hydraulic control according to claim 4 is characterized in that: The specific implementation method of ensuring that the pressure in the hydraulic master cylinder (202) quickly tracks the reference pressure in step 4 is: Step A: Model the actual problem, clarify that the state variables of the system include the hydraulic pressure P(t) in the hydraulic master cylinder (202), the compression stroke S(t) of the piston of the hydraulic master cylinder (202), and the control input of the system includes the current i of the inlet solenoid valve that controls the inlet amount. in (t), the current i of the liquid outlet solenoid valve that controls the liquid outlet out (t), the dynamics of the hydraulic system can be described by the following differential equation: Step B: Since MPC is based on a discrete time model, the dynamic equations of the hydraulic system need to be discretized with a time step of T s , the discrete state space model is: X[k+1]=AX[k]+BU[k]+Ed[k] Where: X[k] is the state vector, U[k] is the control input, d[k] is the disturbance term, A is the system dynamic matrix, B is the control term coefficient matrix, and E is the disturbance term coefficient matrix; Step C: The goal is to make the pressure P(t) track the target pressure P ref (t), the cost function is defined in the time domain Np as: Step D: Set constraints based on actual system characteristics to control the physical limits of the input: IN min ≤U[k]≤U max The state limits of the pressure and stroke of the hydraulic buffer master cylinder are: P min ≤P[k]≤P max Among them, U min , U max Indicates the minimum and maximum limits of the input, P min , P max , S min , S max Indicates the minimum and maximum limits of the pressure and stroke of the master cylinder; Step E: Transform into solving optimization problem. For each sampling time k, MPC obtains the optimal control input by solving the following constrained optimization problem: min J(u) subject to: X[k+1]=AX[k]+BU[k]+Ed[k] IN min ≤U[k]≤U max P min ≤P[k]≤P max Step F: Implement the calculated optimal control input into the system to adjust the operation of the oil inlet and outlet solenoid valves to achieve the desired pressure control effect.

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