Coiled tubing control method, device and equipment based on shape memory alloy

Abstract

The application provides a shape memory alloy-based telescopic oil pipe control method, device and equipment, relates to the telescopic oil pipe control technical field, and comprises the following steps: obtaining a target telescopic amount of a telescopic oil pipe and structure parameters of a shape memory alloy wire mesh layer; determining a structure correction coefficient based on the structure parameters; determining current intensity and application time applied to the shape memory alloy wire mesh layer based on the structure correction coefficient and a pre-set telescopic amount control model; and applying current to the shape memory alloy wire mesh layer based on the current intensity and the application time, so as to realize the telescoping of the telescopic oil pipe. In this mode, the telescopic oil pipe is telescoped to adapt to the length change, thereby avoiding repeated adjustment during oil pipe installation and length waste, avoiding friction and damage of an overlong oil pipe to a vehicle frame and stress concentration of a joint caused by an overshort oil pipe, and improving the leakage rate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of telescopic oil pipe control, in particular to a telescopic oil pipe control method, device and equipment based on shape memory alloy. BACKGROUND

[0002] In a reciprocating piston internal combustion engine, the oil passage plays a crucial and basic role. It constitutes the core network of the circulation and delivery of lubricating oil inside the engine, and its performance is directly related to the reliability, durability, efficiency and overall life of the engine.

[0003] Traditional oil pipes cannot adapt to length changes and rely on manual experience for adjustment. Length adaptability is poor: chassis manufacturing tolerances (±200mm) require repeated adjustment or even rework during oil pipe installation. Material waste is serious: redundant design causes an average waste of 4% of the oil pipe length. Reliability is low: overlong oil pipes are prone to friction and damage with the frame, and over short oil pipes cause stress concentration at the joint, increasing the leakage rate. SUMMARY

[0004] Therefore, the present application aims to provide a telescopic oil pipe control method, device and equipment based on shape memory alloy, which can adapt to length changes through the telescopic function of the telescopic oil pipe, avoid repeated adjustment during oil pipe installation and length waste, avoid overlong oil pipes from being damaged by friction with the frame, and avoid stress concentration at the joint caused by over short oil pipes, thereby reducing the leakage rate.

[0005] In a first aspect, the present application provides a telescopic oil pipe control method based on shape memory alloy, comprising: obtaining a target telescopic amount of a telescopic oil pipe and structure parameters of a shape memory alloy wire mesh layer; determining a structure correction coefficient based on the structure parameters; determining a current intensity and an application time applied to the shape memory alloy wire mesh layer based on the structure correction coefficient and a pre-set telescopic amount control model; and applying a current to the shape memory alloy wire mesh layer based on the current intensity and the application time to realize the telescoping of the telescopic oil pipe.

[0006] In a preferred embodiment of the present application, the structure parameters include a mechanical constraint factor of a buffer layer, a thermal hysteresis factor of an inner lining layer, and an alloy wire mesh density and heat transfer rate factor; determining the structure correction coefficient based on the structure parameters comprises: determining the structure correction coefficient based on the mechanical constraint factor of the buffer layer, the thermal hysteresis factor of the inner lining layer, and the alloy wire mesh density and heat transfer rate factor by the following formula: ; wherein, represents the structure correction coefficient, represents the mechanical constraint factor of the buffer layer, represents the thermal hysteresis factor of the inner lining layer. represents the alloy wire mesh density and heat transfer rate factor.

[0007] In the preferred embodiment of the present application, the determination of the current intensity and the application time applied to the shape memory alloy wire mesh layer based on the structural correction coefficient and the pre-set expansion amount control model comprises: representing the target expansion amount based on the structural correction coefficient by the following formula: ; represents the target expansion amount, represents the structural correction coefficient, represents the alloy material constant, I represents the current intensity, and t represents the application time; the determination of the current intensity and the application time applied to the shape memory alloy wire mesh layer based on the representation of the target expansion amount and the pre-set expansion amount control model.

[0008] In the preferred embodiment of the present application, the determination of the current intensity and the application time applied to the shape memory alloy wire mesh layer based on the representation of the target expansion amount and the pre-set expansion amount control model comprises: representing the expansion amount control model by the following formula: ; the determination of the current intensity and the application time applied to the shape memory alloy wire mesh layer based on the representation of the expansion amount control model and the representation of the target expansion amount; wherein the maximum value of the current intensity is determined by the following formula: ; wherein I represents the current intensity, Imax represents the maximum value of the current intensity, R represents the alloy resistance, T represents the alloy temperature, Tmax represents the maximum value of the alloy temperature, and the maximum value of the alloy temperature is set to 85℃, represents the ambient temperature.

[0009] In the preferred embodiment of the present application, the application of the current to the shape memory alloy wire mesh layer based on the current intensity and the application time comprises: the application of the current to the shape memory alloy wire mesh layer based on the current intensity and the application time by PID closed-loop control; the application of the current to the shape memory alloy wire mesh layer based on the current intensity and the application time by PID closed-loop control comprises: real-time monitoring of the alloy temperature and the actual expansion amount of the expansion tubing; dynamic adjustment of the current by a PID algorithm; wherein when the PID parameters are set, the proportional coefficient is adjusted until the system oscillates, the critical gain and the period are recorded, and the PID parameters are set according to a pre-set formula.

[0010] In the preferred embodiment of the present application, the method further comprises: predicting the service life of the expansion tubing; the prediction of the service life of the expansion tubing comprises: determination of a service life consumption index by the following formula: ; wherein, represents the service life consumption index, N represents the cumulative cycle number, Nhigh represents the high-temperature number, Nmid represents the medium-temperature number, Nlow represents the low-temperature number, represents the total heating time.

[0011] In the preferred embodiment of the present application, the telescopic oil pipe comprises a shape memory alloy wire mesh layer, a silicon rubber aramid buffer layer, a PTFE lining layer and end electrode pieces for connecting an external power source.

[0012] In a second aspect, the embodiments of the present application further provide a telescopic oil pipe control device based on a shape memory alloy, comprising: a data acquisition module configured to acquire a target telescopic amount of the telescopic oil pipe and structure parameters of a shape memory alloy wire mesh layer; a structure correction coefficient determination module configured to determine a structure correction coefficient based on the structure parameters; a current intensity determination module configured to determine a current intensity and an application time of the current intensity applied to the shape memory alloy wire mesh layer based on the structure correction coefficient and a pre-set telescopic amount control model; and a current application module configured to apply the current to the shape memory alloy wire mesh layer based on the current intensity and the application time to realize the telescoping of the telescopic oil pipe.

[0013] In a third aspect, the embodiments of the present application further provide an electronic device, comprising a processor and a memory, wherein the memory stores computer executable instructions capable of being executed by the processor, and the processor executes the computer executable instructions to implement the telescopic oil pipe control method based on a shape memory alloy of the first aspect.

[0014] In a fourth aspect, the embodiments of the present application further provide a computer readable storage medium, wherein the computer readable storage medium stores computer executable instructions, and the computer executable instructions, when invoked and executed by a processor, cause the processor to implement the telescopic oil pipe control method based on a shape memory alloy of the first aspect.

[0015] The embodiments of the present application bring the following beneficial effects:

[0016] The embodiments of the present application provide a telescopic oil pipe control method, device and equipment based on a shape memory alloy, which acquires a target telescopic amount of the telescopic oil pipe and structure parameters of a shape memory alloy wire mesh layer, determines a structure correction coefficient based on the structure parameters, determines a current intensity and an application time of the current intensity applied to the shape memory alloy wire mesh layer based on the structure correction coefficient and a pre-set telescopic amount control model, and applies the current to the shape memory alloy wire mesh layer based on the current intensity and the application time to realize the telescoping of the telescopic oil pipe. In this way, the telescopic oil pipe is telescoped to adapt to the length change, which avoids the repeated adjustment of the oil pipe during installation and the waste of the length, avoids the friction and damage of the overlong oil pipe with the vehicle frame and the stress concentration of the joint caused by the too short oil pipe, and improves the leakage rate.

[0017] Other features and advantages of the present disclosure will be described in the following description, or can be learned from the description, or can be determined without any doubt, or can be known by implementing the above-mentioned technologies of the present disclosure.

[0018] In order to make the above objectives, characteristics and advantages of the present disclosure more obvious and easy to understand, the following preferred embodiments are specifically described below, and the accompanying drawings are described in detail as follows. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without any creative labor.

[0020] Figure 1 A flow chart of a shape memory alloy-based telescopic oil pipe control method provided by an embodiment of the present application;

[0021] Figure 2 A flow chart of another shape memory alloy-based telescopic oil pipe control method provided by an embodiment of the present application;

[0022] Figure 3 A structural schematic diagram of a shape memory alloy-based telescopic oil pipe control device provided by an embodiment of the present application;

[0023] Figure 4 A structural schematic diagram of an electronic device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0024] In order to make the objectives, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative labor fall within the protection scope of the present application.

[0025] In a reciprocating piston internal combustion engine, the oil passage plays a crucial and basic role. It constitutes the core network of the circulation and delivery of lubricating oil inside the engine, and its performance is directly related to the reliability, durability, efficiency and overall life of the engine.

[0026] Traditional oil pipes cannot adapt to length changes and rely on manual experience adjustment. Poor length adaptability: chassis manufacturing tolerance (±200mm) leads to repeated adjustment or even rework during oil pipe installation. Serious material waste: redundant design makes the average waste length of oil pipe reach 4%. Low reliability: too long oil pipe is easy to be damaged by friction with the frame, and too short oil pipe leads to stress concentration of the joint and increases the leakage rate.

[0027] Based on this, the shape memory alloy-based telescopic oil pipe control method, device and equipment provided by the embodiment can obtain the target telescopic amount of the telescopic oil pipe and the structural parameters of the shape memory alloy wire mesh layer, determine the structural correction coefficient based on the structural parameters, determine the current intensity and application time applied to the shape memory alloy wire mesh layer based on the structural correction coefficient and the pre-set telescopic amount control model, apply the current to the shape memory alloy wire mesh layer based on the current intensity and the application time, and realize the telescoping of the telescopic oil pipe. In this way, the telescopic oil pipe is telescoped to adapt to the length change, the repeated adjustment during the installation of the oil pipe and the waste of the length are avoided, the overlong oil pipe is prevented from being damaged due to friction with the frame, and the joint stress concentration caused by the too short oil pipe is avoided, so that the leakage rate is improved.

[0028] To facilitate the understanding of the embodiment, first, a shape memory alloy-based telescopic oil pipe control method is introduced in detail.

[0029] Embodiment 1

[0030] The embodiment provides a shape memory alloy-based telescopic oil pipe control method, Figure 1 The flowchart of the shape memory alloy-based telescopic oil pipe control method provided by the embodiment is shown in FIG. 1. Figure 1 As shown in the figure, the shape memory alloy-based telescopic oil pipe control method can include the following steps:

[0031] In step S101, the target telescopic amount of the telescopic oil pipe and the structural parameters of the shape memory alloy wire mesh layer are obtained.

[0032] The structure of the telescopic oil pipe includes the shape memory alloy wire mesh layer, the silicon rubber aramid buffer layer, the PTFE inner lining layer and the end electrode sheet, and the end electrode sheet is used to connect the external power supply.

[0033] In step S102, the structural correction coefficient is determined based on the structural parameters.

[0034] In step S103, the current intensity and the application time applied to the shape memory alloy wire mesh layer are determined based on the structural correction coefficient and the pre-set telescopic amount control model.

[0035] In actual application, the current-temperature-telescopic amount control can be quantified by the following formula and experimental data:

[0036] Energy-temperature formula: ; wherein: .

[0037] NiTi mass = .

[0038] Specific heat capacity of NiTi alloy is about 0.837 J / g·K.

[0039] ΔT = T - T0: Temperature rise (T0 is ambient temperature).

[0040] After combining: .

[0041] NiTi wire mesh volume estimation (shape memory layer).

[0042] Mesh density: 20 mesh / cm 2 (i.e. contains 400 intersections per square centimeter).

[0043] Braided layer area: assuming the length of the tubing is L, the diameter D = 12 mm + 2 x 1.5 mm ≈ 15 mm

[0044] External surface area: .

[0045] The length of the wire mesh per unit area is estimated to be about 2 NiTi wires per "mesh", and the total length of NiTi is roughly estimated to be: ≈ 800 • A.

[0046] Assuming the diameter of the NiTi wire is 0.1 mm, the volume is: .

[0047] Temperature-strain relationship (thermal expansion):

[0048] After heating, NiTi alloy transforms from martensite to austenite, and the expansion process is not linear. We can use an S-shaped curve (hyperbolic tangent) to simulate the expansion process: .

[0049] where, ε is the strain, εmax is the maximum strain, NiTi is about 6-8%, is a fitting constant that controls the slope, is the phase transition temperature, which can be about 50°C.

[0050] The formula for calculating the expansion amount (ΔL) is: .

[0051] Combining the heat conduction formula, material volume calculation, and nonlinear strain relationship, the final composite control formula is: .

[0052] where the material structure affects the supplementary factor, such as the silicon rubber aramid buffer layer: with a hardness of 70A, it will produce a certain rebound force (restricting the expansion of NiTi). Introduce the elastic counter coefficient γ ∈ [0.8, 1.0]. PTFE lining layer: thermal insulation and low friction, affecting the heat diffusion speed, introducing a thermal hysteresis term .

[0053] After composite correction: .

[0054] wherein, is the mechanical constraint coefficient of the buffer layer, is the thermal hysteresis caused by the inner liner layer, is the strain slope constant, is the volume of the NiTi alloy wire mesh, is the ambient temperature, represents the phase transition starting temperature.

[0055] Step S104, based on the current intensity and the application time, the shape memory alloy wire mesh layer is applied with current to realize the expansion and contraction of the stretchable oil pipe.

[0056] wherein, the shape memory alloy wire mesh layer can be applied with current based on the current intensity and the application time through PID closed loop control.

[0057] wherein, regarding the electrode connection mode: the electrode sheet (copper plated silver material) is connected with the power supply and the PID temperature control module. The electrode sheet is connected to the positive and negative electrodes of the power supply, and at the same time connected to the output end of the PID temperature control module. The PID temperature control module controls the current size on the electrode sheet according to the needs of temperature control, so as to adjust the heating power. In order to ensure the good contact of the electrode sheet with the oil pipe, the electrode sheet can be closely attached to the shape memory alloy wire mesh layer (NiTi alloy woven layer) of the oil pipe, because the shape memory alloy wire mesh layer has good electrical conductivity and will generate heat when passing through current, realizing the heating of the oil pipe.

[0058] In practical application, a PID control algorithm framework can be constructed, which is used to calculate the current intensity I and the application time t according to the input expected expansion and contraction amount ΔL, combined with the material characteristics and the composite structure influence factor, so as to control the NiTi shape memory alloy wire mesh layer to heat to a safe temperature and realize the preset expansion and contraction amount.

[0059] Specifically, a mathematical model of structural correction factor is introduced:

[0060] 1) Composite structure correction coefficient.

[0061] The above steps define the structural correction factor γ, considering the influence of the buffer layer thickness and hardness on heat conduction and deformation, the PTFE inner liner layer inner diameter and friction factor, the alloy wire mesh density and heat transfer rate, and the influence of the oil pipe length on the heat diffusion time, γ can be set to 1.37 through experiment or experience.

[0062] 2) Expansion and contraction amount and current / time model.

[0063] ; represents the target extension amount, represents the structure correction coefficient, represents the alloy material constant, which can be fitted with k ≈ 0.025, I represents the current intensity, and t represents the application time; based on the representation of the target extension amount and the pre-set extension amount control model, the current intensity and the application time applied to the shape memory alloy wire mesh layer are determined.

[0064] Specifically, the controller targets:

[0065] The PID control target can be set to maintain the temperature T within the safe range (60°C - 85°C):

[0066] The temperature and current relationship is approximately expressed as: ; where the maximum value of the current intensity is determined by the following formula: ; where I represents the current intensity, I max represents the maximum value of the current intensity, R represents the alloy resistance, T represents the alloy temperature, T max represents the maximum value of the alloy temperature, the maximum value of the alloy temperature is set to 85°C, represents the ambient temperature, which can be 25°C.

[0067] Specifically, the PID control flow (pseudo code):

[0068] # Input parameters

[0069] ΔL_target = 100 # target extension amount mm

[0070] γ = 1.37 # material structure correction coefficient

[0071] k = 0.025 # alloy constant (experimental fitting)

[0072] T_max = 85 # upper limit of safe temperature °C

[0073] R = 2.5 # alloy resistance Ω

[0074] T_env = 25 # ambient temperature

[0075] # Safe current calculation

[0076] def get_safe_current(T_max, R, T_env):

[0077] return min(4.0, ((T_max - T_env) / R) ** 0.5)

[0078] I_safe = get_safe_current(T_max, R, T_env)

[0079] # Calculation time

[0080] # ΔL = γ * k * I^2 * t => t = ΔL / (γ * k * I^2)

[0081] t_required = ΔL_target / (γ * k * I_safe**2)

[0082] # PID control process (control the heater for t_required seconds while the temperature is maintained within the safe range)

[0083] # Sample the temperature every Δt seconds and perform PID temperature control

[0084] Specifically, the calculation result example:

[0085] When the target extension amount is 100 mm and the safe current is I = 4.0 A, the corresponding time is:

[0086] Specifically, the conclusion is:

[0087] When the input extension amount ΔL is 100 mm, the safe current I is 4.0 A, the temperature control PID control maintains <85°C, and the application time t is about 73 seconds.

[0088] The above algorithm can be deployed in a microcontroller (such as STM32, Arduino) or a host computer program, which can be directly converted into code and combined with a temperature sensor closed-loop feedback (such as a thermocouple + ADC module) for dynamic control.

[0089] Specifically, the heating control circuit principle is explained:

[0090] Use a sensor and a PID temperature control closed-loop control module. Increase the sensor to form a closed-loop control system: use a displacement sensor (such as inductive, fiber Bragg grating, laser displacement, Hall effect sensor) embedded in the joint of the oil pipe to monitor the extension amount in real time. Use a temperature sensor (such as a thermocouple, NTC thermistor) to monitor the alloy temperature in real time. The extension amount and temperature information are fed back to the controller to form a closed-loop feedback system, which accurately adjusts the heating current and duration.

[0091] 1) PID temperature control module and temperature feedback:

[0092] In the intelligent stretchable oil pipe, through the cooperation of the temperature feedback system and the PID temperature control module, high-precision control of the shape memory alloy heating process is achieved.

[0093] Temperature detection module: NTC thermistor (or PTC, thermocouple) is embedded in the area near the SMA of the oil pipe, acting as a feedback resistor to detect the actual temperature in real time. Its resistance value changes with temperature.

[0094] Feedback control logic: The thermistor is connected to the input of the PID temperature control module. The system converts the resistance signal to a temperature value, compares it with the target temperature, and calculates the deviation in real time.

[0095] PID adjustment module: Based on the deviation, the PID algorithm is executed to adjust the output current and control the heating power of the electrode sheet, so that the SMA temperature quickly and stably maintains in the set target range, ensuring the accuracy and consistency of the oil pipe extension and contraction.

[0096] Optionally, auxiliary temperature sensor: A redundant thermocouple sensor is set at a key point for system calibration, data verification and safety diagnosis, improving system stability. Then, the PID temperature control module adjusts the output signal according to the PID algorithm to control the heating power of the electrode sheet, keeping the oil pipe temperature near the set value.

[0097] Through the cooperation of the PID temperature control module, reasonable electrode connection method and temperature feedback system, accurate control of the electrode sheet heating can be achieved to meet the temperature control requirements of the telescopic oil pipe.

[0098] PID (Proportional-Integral-Derivative) controller is a commonly used closed-loop control algorithm for precise temperature control. It adjusts the output in proportion to the temperature deviation based on the set temperature value and the actual temperature value, eliminates steady-state error through integral (I), and suppresses overshoot through differential (D) to improve stability, outputting appropriate control signals to adjust the heating power.

[0099] In the open-loop regulation stage (initial / test stage), the target current or heating time period (e.g. 2A for 3 seconds) needs to be set, the temperature change curve (sampled by thermocouple or NTC) is recorded, the oil pipe extension length change is measured, the open-loop control table (including current, heating time, temperature, extension amount) is established, and the change curve is analyzed (understanding lag time, inertia, maximum extendable temperature, safety critical point, etc.). Although open-loop control has no feedback, it is very important for initial debugging of the system.

[0100] In the closed-loop regulation stage (when running formally), the PID algorithm is used to accurately lock the extension temperature at the target value, matching the user-set extension length.

[0101] For debugging scheme:

[0102] The Ziegler-Nichols empirical adjustment method (Z-N method) can be used, I=0 and D=0 can be set, and only the P value is adjusted; the P value is increased until the system starts to oscillate, and the critical gain Ku and the oscillation period Tu are recorded; and the PID is set by using a preset formula.

[0103] Specifically, the preset formula is: ; wherein, The proportional gain represents a response speed control; The integral time constant is used to eliminate steady-state error; The derivative time constant is used to suppress system overshoot.

[0104] The PID self-tuning chip or software module can also be used, and the modern PID controller or development board (such as STM32, Arduino PID library) supports: automatic parameter adjustment function; temperature disturbance response analysis; adaptive correction of PID parameters.

[0105] For example, when the actual temperature is lower than the set temperature, the PID controller will output a larger control signal according to the size of the deviation, increase the heating power of the electrode sheet, and make the temperature rise rapidly; when the actual temperature approaches the set temperature, the PID controller will gradually reduce the control signal to prevent overshoot, thereby achieving accurate temperature control. It needs to be calibrated and trained in the system initialization stage, and the PID parameters can be dynamically adjusted to adapt to different environmental temperatures and system states.

[0106] The shape memory alloy-based telescopic oil pipe control method provided by the embodiment can obtain a target telescopic amount of the telescopic oil pipe and structure parameters of a shape memory alloy wire mesh layer, determine a structure correction coefficient based on the structure parameters, determine a current intensity and an application time applied to the shape memory alloy wire mesh layer based on the structure correction coefficient and a pre-set telescopic amount control model, apply a current to the shape memory alloy wire mesh layer based on the current intensity and the application time, and realize telescoping of the telescopic oil pipe. In this way, the telescopic oil pipe is telescoped to adapt to the length change, the repeated adjustment during installation of the oil pipe is avoided, the length waste is avoided, the friction and damage of the excessively long oil pipe with the vehicle frame are avoided, the joint stress concentration caused by the excessively short oil pipe is avoided, and the leakage rate is improved.

[0107] Embodiment 2

[0108] The embodiment of the present application also provides another shape memory alloy-based telescopic oil pipe control method.

[0109] Figure 2 The flowchart of another shape memory alloy-based telescopic oil pipe control method provided by the embodiment of the present application is as follows. Figure 2As shown, the shape memory alloy-based stretchy tubing control method can include the following steps:

[0110] In step S201, a target stretch amount of the stretchy tubing and structure parameters of the shape memory alloy wire mesh layer are obtained.

[0111] In step S202, a structure correction coefficient is determined based on the structure parameters.

[0112] The structure parameters include a mechanical constraint factor of the buffer layer, a thermal hysteresis factor of the inner liner layer, and an alloy wire mesh density and heat transfer rate factor.

[0113] Specifically, determining the structure correction coefficient based on the structure parameters can include determining the structure correction coefficient based on the mechanical constraint factor of the buffer layer, the thermal hysteresis factor of the inner liner layer, and the alloy wire mesh density and heat transfer rate factor by the following formula: ; wherein, represents the structure correction coefficient, represents the mechanical constraint factor of the buffer layer, represents the thermal hysteresis factor of the inner liner layer. represents the alloy wire mesh density and heat transfer rate factor.

[0114] In step S203, the current intensity and application time applied to the shape memory alloy wire mesh layer are determined based on the structure correction coefficient and a pre-set stretch amount control model.

[0115] Specifically, determining the current intensity and application time applied to the shape memory alloy wire mesh layer based on the structure correction coefficient and the pre-set stretch amount control model can include representing the target stretch amount based on the structure correction coefficient by the following formula: ; represents the target stretch amount, represents the structure correction coefficient, represents an alloy material constant, I represents the current intensity, and t represents the application time; the current intensity and the application time applied to the shape memory alloy wire mesh layer are determined based on the representation of the target stretch amount and the pre-set stretch amount control model.

[0116] The current intensity and the application time applied to the shape memory alloy wire mesh layer are determined based on the representation of the target stretch amount and the pre-set stretch amount control model, which can include representing the stretch amount control model by the following formula: ; the current intensity and the application time applied to the shape memory alloy wire mesh layer are determined based on the representation of the stretch amount control model and the representation of the target stretch amount.

[0117] The maximum value of the current intensity is determined by the following formula: ;

[0118] wherein I represents the current intensity, I max represents the maximum value of the current intensity, R represents the alloy resistance, T represents the alloy temperature, T max represents the maximum value of the alloy temperature, the maximum value of the alloy temperature is set to 85℃, represents the ambient temperature.

[0119] Step S204, based on the current intensity and the application time, a current is applied to the shape memory alloy wire mesh layer to realize the expansion and contraction of the stretchable oil pipe.

[0120] Specifically, based on the current intensity and the application time, a current is applied to the shape memory alloy wire mesh layer, which can include: based on the current intensity and the application time, a current is applied to the shape memory alloy wire mesh layer through PID closed-loop control.

[0121] Wherein, based on the current intensity and the application time, a current is applied to the shape memory alloy wire mesh layer through PID closed-loop control, which can include: real-time monitoring of alloy temperature and actual expansion and contraction amount of the stretchable oil pipe; dynamically adjusting the current through PID algorithm; wherein when setting PID parameters, adjust the proportional coefficient until the system oscillates, record the critical gain and period; set PID parameters according to the preset formula.

[0122] Step S205, the life of the stretchable oil pipe is predicted.

[0123] Specifically, the life of the stretchable oil pipe is predicted, which can include: determining the life consumption index by the following formula: ; wherein, represents the life consumption index, N represents the cumulative cycle number, Nhigh represents the high temperature number, Nmid represents the medium temperature number, Nlow represents the low temperature number, represents the total heating time.

[0124] In practical application, considering the deformation irregularity caused by environmental changes and aging effects, considering the expansion and contraction amount control based on model prediction, environmental temperature mutation and nonlinear phase change:

[0125] The phase change temperature window (As-Af) and Ms-Mf of NiTi alloy are nonlinearly widened, and sudden low or high temperature environment will cause control deviation, a temperature sensitive compensation curve model can be introduced, or a multivariable modeling (MV-model) adjustment strategy can be used.

[0126] Regarding the oil pipe life prediction and phased control strategy:

[0127] (1) In order to predict the life of the intelligent stretchable oil pipe, a life estimation model can be established, considering the following factors:

[0128] 1. Table 1 below is a comparison table of the main influencing factors.

[0129] Table 1:

[0130]

[0131] 2. Table 2 below is a comparison table of influencing factors. Each variable is assigned a weighting factor to represent its "intensity of damage" to lifespan reduction.

[0132] Table 2:

[0133]

[0134] Regarding the classification of lifespan levels, a threshold value for each lifespan level can be set (the value can be adjusted based on experiments).

[0135] Table 3 below is a grade-threshold comparison table.

[0136] Table 3:

[0137]

[0138] A safety threshold management module can be introduced: it can actively cut off the power or trigger an alarm when the response time or expansion range is abnormal.

[0139] Example 3

[0140] Corresponding to the above method embodiments, this invention provides a telescopic oil pipe control device based on shape memory alloy. Figure 3 A schematic diagram of a telescopic oil pipe control device based on shape memory alloy provided in an embodiment of the present invention is shown below. Figure 3 As shown, the telescopic tubing control device based on shape memory alloy may include:

[0141] The data acquisition module 301 is used to acquire the target telescopic amount of the telescopic tubing and the structural parameters of the shape memory alloy wire mesh layer.

[0142] The structural correction factor determination module 302 is used to determine the structural correction factor based on the structural parameters.

[0143] The current intensity determination module 303 is used to determine the current intensity and application time applied to the shape memory alloy wire mesh layer based on the structural correction coefficient and the pre-set expansion control model.

[0144] The current application module 304 is used to apply current to the shape memory alloy wire mesh layer based on the current intensity and application time to achieve the extension and retraction of the telescopic tubing.

[0145] The shape memory alloy-based telescopic oil pipe control device provided by the embodiment of the present application can obtain a target telescopic amount of the telescopic oil pipe and structural parameters of the shape memory alloy wire mesh layer, determine a structural correction coefficient based on the structural parameters, determine a current intensity and an application time applied to the shape memory alloy wire mesh layer based on the structural correction coefficient and a pre-set telescopic amount control model, and apply a current to the shape memory alloy wire mesh layer based on the current intensity and the application time, so as to realize the telescoping of the telescopic oil pipe. In this way, the telescopic oil pipe is telescoped to adapt to the length change, the repeated adjustment during the installation of the oil pipe and the waste of the length are avoided, the overlong oil pipe is prevented from being damaged due to the friction with the frame, and the joint stress concentration caused by the too short oil pipe is avoided, so that the leakage rate is improved.

[0146] In some embodiments, the structural parameters include a mechanical constraint factor of the buffer layer, a thermal hysteresis factor of the inner lining layer, and an alloy wire mesh density and heat transfer rate factor, and the structural correction coefficient determination module is further configured to determine the structural correction coefficient based on the mechanical constraint factor of the buffer layer, the thermal hysteresis factor of the inner lining layer, and the alloy wire mesh density and heat transfer rate factor according to the following formula: ; wherein, represents the structural correction coefficient, represents the mechanical constraint factor of the buffer layer, represents the thermal hysteresis factor of the inner lining layer. represents the alloy wire mesh density and heat transfer rate factor.

[0147] In some embodiments, the structural correction coefficient determination module is further configured to represent the target telescopic amount based on the structural correction coefficient according to the following formula: ; represents the target telescopic amount, represents the structural correction coefficient, represents an alloy material constant, I represents the current intensity, and t represents the application time; and the current intensity and the application time applied to the shape memory alloy wire mesh layer are determined based on the representation of the target telescopic amount and the pre-set telescopic amount control model.

[0148] In some embodiments, the current intensity determination module is further configured to represent the telescopic amount control model according to the following formula: ; and the current intensity and the application time applied to the shape memory alloy wire mesh layer are determined based on the representation of the telescopic amount control model and the representation of the target telescopic amount; wherein the maximum value of the current intensity is determined according to the following formula: ; wherein I represents the current intensity, Imax represents the maximum value of the current intensity, R represents an alloy resistance, T represents an alloy temperature, and Tmax represents the maximum value of the alloy temperature, and the maximum value of the alloy temperature is set to 85℃, represents an ambient temperature.

[0149] In some embodiments, the current intensity determination module is further configured to apply the current to the shape memory alloy wire mesh layer based on the current intensity and the application time through PID closed-loop control.

[0150] In some embodiments, the current application module is further configured to monitor the alloy temperature and the actual expansion amount of the expansion tubing in real time, and dynamically adjust the current through a PID algorithm, wherein when the PID parameters are set, the proportional coefficient is adjusted until the system oscillates, and the critical gain and period are recorded; and the PID parameters are set according to a preset formula.

[0151] In some embodiments, the current application module is further configured to predict the service life of the expansion tubing, and the prediction of the service life of the expansion tubing comprises: determining a service life consumption index through the following formula: ; wherein, represents the service life consumption index, N represents the cumulative cycle number, Nhigh represents the high-temperature number, Nmid represents the medium-temperature number, Nlow represents the low-temperature number, represents the total heating time.

[0152] In some embodiments, the structure of the expansion tubing comprises a shape memory alloy wire mesh layer, a silicon rubber aramid buffer layer, a PTFE inner lining layer, and an end electrode sheet for connecting an external power supply.

[0153] The device provided in the embodiments of the present application has the same implementation principle and generated technical effects as the foregoing method embodiments, and for brevity of description, the part not mentioned in the device embodiment can be referred to the corresponding content in the foregoing method embodiments.

[0154] Embodiment 4

[0155] The embodiments of the present application further provide an electronic device for running the above-mentioned shape memory alloy-based expansion tubing control method. Figure 4 As shown in a structural schematic diagram of an electronic device, the electronic device comprises a memory 400 and a processor 401, wherein the memory 400 is configured to store one or more computer instructions, and the one or more computer instructions are executed by the processor 401 to implement the above-mentioned shape memory alloy-based expansion tubing control method.

[0156] Further, Figure 4 As shown in the electronic device, the electronic device further comprises a bus 402 and a communication interface 403, and the processor 401, the communication interface 403 and the memory 400 are connected through the bus 402.

[0157] The memory 400 can include a high-speed random access memory (RAM), and can also include a non-volatile memory, such as at least one disk memory. The communication connection between the system network element and at least one other network element is realized through at least one communication interface 403 (which can be wired or wireless), and the Internet, a wide area network, a local network, a metropolitan area network, etc. can be used. The bus 402 can be an ISA bus, a PCI bus, or an EISA bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 4 Only one bidirectional arrow is used to represent the system network element and at least one other network element, but it does not mean that there is only one bus or one type of bus.

[0158] The processor 401 can be an integrated circuit chip with signal processing capability. In the implementation process, each step of the above method can be completed by the integrated logic circuit of hardware in the processor 401 or the instructions in the form of software. The processor 401 described above can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. Each method, step and logic block disclosed in the embodiment of the present application can be implemented or executed. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor. The steps of the method disclosed in combination with the embodiment of the present application can be directly embodied as a hardware code processor for execution, or a combination of hardware and software modules in the code processor for execution. The software module can be located in a random access memory, a flash memory, a read-only memory, a programmable read-only memory, an electrically erasable programmable memory, a register, etc. The storage medium in the art. The storage medium is located in the memory 400, and the processor 401 reads the information in the memory 400, and combines the hardware to complete the steps of the method of the above embodiment.

[0159] The embodiment of the present application further provides a computer readable storage medium, which stores computer executable instructions, and the computer executable instructions cause the processor to implement the shape memory alloy based stretchy tubing control method when the computer executable instructions are called and executed by the processor.

[0160] The computer program product for implementing the shape memory alloy based stretchy tubing control method provided by the embodiment of the present application comprises a computer readable storage medium storing non-volatile program codes executable by the processor, and the instructions included in the program codes can be used to execute the method in the foregoing method embodiment.

[0161] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system, device and unit described above can refer to the corresponding process in the foregoing method embodiment, and will not be repeated here.

[0162] In the several embodiments of the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. The device embodiments described above are only schematic. For example, the division of the units is only a logical function division, and there can be another division manner in actual implementation. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection between the units can be indirect coupling or communication connection through some communication interface, device or unit, and can be electrical, mechanical or other forms.

[0163] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on a plurality of network units. According to actual needs, some or all of the units can be selected to achieve the purpose of the embodiment.

[0164] In addition, each functional unit in each embodiment of the present application can be integrated into a processing unit, or each unit can exist physically independently, or two or more units can be integrated into one unit.

[0165] If the functions are implemented in the form of software function units and sold or used as independent products, they can be stored in a nonvolatile computer readable storage medium executable by a processor. Based on this understanding, the technical solutions of the present application or the part of the prior art that essentially contributes or the part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various media that can store program codes.

[0166] Finally, it should be noted that: the above-described embodiments are only specific embodiments of the present application, which are used to illustrate the technical solutions of the present application, but not to limit them. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily think of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed by the present application, or make equivalent replacements to some of the technical features. The modifications, changes or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for controlling telescopic oil pipes based on shape memory alloys, characterized in that, The method includes: Obtain the target expansion and contraction amount of the telescopic tubing and the structural parameters of the shape memory alloy wire mesh layer; Determine the structural correction coefficients based on the aforementioned structural parameters; Based on the structural correction coefficient and the pre-set expansion control model, the current intensity and application time applied to the shape memory alloy wire mesh layer are determined. Based on the current intensity and the application time, a current is applied to the shape memory alloy wire mesh layer to achieve the extension and retraction of the telescopic oil pipe; The structural parameters include: the mechanical constraint factor of the buffer layer, the thermal hysteresis factor of the inner lining layer, and the density and heat transfer rate factor of the alloy wire mesh. The determination of structural correction coefficients based on the structural parameters includes: The structural correction coefficient is determined using the following formula based on the mechanical constraint factor of the buffer layer, the thermal hysteresis factor of the inner lining layer, and the density and heat transfer rate factor of the alloy wire mesh: ;in, This represents the structural correction factor. The mechanical constraint factor of the buffer layer is represented by This represents the thermal hysteresis factor of the inner lining layer. This represents the alloy wire mesh density and heat transfer factor; The determination of the current intensity and application time applied to the shape memory alloy wire mesh layer based on the structural correction coefficient and a pre-set stretching control model includes: The target expansion / contraction amount is expressed using the following formula based on the structural correction coefficient: ; This represents the target scaling amount. This represents the structural correction factor. denoted by , where I represents the alloy material constant, t represents the current intensity, and t represents the application time. Based on the representation of the target expansion amount and the pre-set expansion amount control model, the current intensity and application time applied to the shape memory alloy wire mesh layer are determined; The determination of the current intensity and application time applied to the shape memory alloy wire mesh layer based on the representation of the target stretching amount and the pre-set stretching amount control model includes: The scaling control model is represented by the following formula: ; Based on the representation of the stretch control model and the representation of the target stretch, the current intensity and application time applied to the shape memory alloy wire mesh layer are determined. The maximum value of the current intensity is determined by the following formula: ; Where I represents the current intensity, I max R represents the maximum current intensity, R represents the alloy resistance, and T represents the alloy temperature. max This indicates the maximum alloy temperature, which is set to 85°C. Indicates ambient temperature.

2. The method according to claim 1, characterized in that, Applying current to the shape memory alloy mesh layer based on the current intensity and the application time includes: A current is applied to the shape memory alloy mesh layer based on the current intensity and the application time using PID closed-loop control. The step of applying current to the shape memory alloy wire mesh layer through PID closed-loop control based on the current intensity and the application time includes: Real-time monitoring of alloy temperature and actual expansion / contraction of the telescopic oil pipe; The current is dynamically adjusted using a PID algorithm. In the process of tuning the PID parameters, the proportional coefficient is adjusted until the system oscillates, and the critical gain and period are recorded; the PID parameters are set according to the preset formula.

3. The method according to claim 1, characterized in that, The method further includes: The lifespan of the telescopic oil pipe is predicted; The prediction of the lifespan of the telescopic oil pipe includes: The lifespan consumption index is determined using the following formula: ; in, This represents the lifespan consumption index, where N represents the cumulative number of cycles. high N represents the number of times the temperature is reached. mid N represents the number of intermediate temperature cycles. low Indicates the number of times the temperature was lowered. This indicates the total heating time.

4. The method according to claim 1, characterized in that, The telescopic tubing comprises: a shape memory alloy wire mesh layer, a silicone rubber aramid buffer layer, a PTFE inner lining layer, and an end electrode plate, wherein the end electrode plate is used to connect to an external power source.

5. A telescopic oil pipe control device based on shape memory alloy, characterized in that, For implementing the telescopic tubing control method based on shape memory alloy according to any one of claims 1 to 4, the apparatus comprises: The data acquisition module is used to acquire the target expansion and contraction amount of the telescopic tubing and the structural parameters of the shape memory alloy wire mesh layer; A structural correction coefficient determination module is used to determine structural correction coefficients based on the structural parameters; The current intensity determination module is used to determine the current intensity and application time applied to the shape memory alloy wire mesh layer based on the structural correction coefficient and the pre-set expansion control model. A current application module is used to apply current to the shape memory alloy wire mesh layer based on the current intensity and the application time to achieve the extension and retraction of the telescopic oil pipe.

6. An electronic device, characterized in that, It includes a processor and a memory, the memory storing computer-executable instructions that can be executed by the processor, the processor executing the computer-executable instructions to implement the telescopic tubing control method based on shape memory alloy as described in any one of claims 1 to 4.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when invoked and executed by a processor, cause the processor to implement the telescopic tubing control method based on shape memory alloy as described in any one of claims 1 to 4.

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