CN111460667B - Method, device, equipment and medium for simulating real pressure wave environment - Google Patents
Method, device, equipment and medium for simulating real pressure wave environment Download PDFInfo
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Abstract
The application provides a method for simulating a real pressure wave environment, which comprises the following steps: and acquiring a target pressure wave curve to be loaded, wherein the target pressure wave curve is a curve generated according to real pressure data, determining the advanced adjustment quantity and the advanced adjustment time of the opening of the airtight valve according to the target pressure wave curve, and adjusting the opening of the airtight valve according to the advanced adjustment quantity and the advanced adjustment time so as to simulate the real pressure wave environment. Therefore, the problem of time delay in pressure wave loading is solved, a real pressure wave curve can be accurately loaded, and the reliability of air tightness test is ensured.
Description
Technical Field
The present application relates to the field of vehicles, and more particularly, to a method, apparatus, device, and computer readable storage medium for simulating a real pressure wave environment in a rail vehicle scenario.
Background
With the continuous development of rail transit technology, rail vehicles such as high-speed trains are running at increasingly high speeds. For example, the current high speed trains can even reach an instantaneous speed per hour of 574.8 km/h (kilometer per hour km/h). At this speed of travel, the air flow and pressure of the surrounding air will change drastically as the vehicle encounters or the vehicle passes through the tunnel, creating a pressure wave.
If the air tightness of the vehicle is poor, for example, a gap exists in the vehicle body, pressure waves can be caused to enter the vehicle along the gap, which can cause damage to parts of the vehicle such as doors, windows and the like, and can cause tinnitus and earache of passengers to seriously affect the user experience. Therefore, it is generally necessary to test the air tightness of the vehicle at the time of delivery of the vehicle.
Currently, the air tightness test of vehicles is mainly implemented in an air tightness fatigue test stand. Specifically, a pressure wave is loaded in the airtight fatigue test bed, and the actual pressure wave environment when the vehicles meet or enter a tunnel is simulated, and the air tightness of the vehicles is tested under the environment.
However, the current pressure wave loading method is difficult to accurately load a real pressure wave curve, and the reliability of the air tightness test is affected.
Disclosure of Invention
The application provides a method for simulating a real pressure wave environment, which solves the problem of time delay of pressure wave loading in the process of simulating the real pressure wave environment in the related technology, can accurately load a real pressure wave curve, and ensures the reliability of air tightness test. The application also provides a device, an apparatus, a computer readable storage medium and a computer program product for implementing the method of simulating a real pressure environment.
In a first aspect, the application provides a method of simulating a real pressure wave environment. Specifically, a target pressure wave curve to be loaded is firstly obtained, the target pressure wave curve is generated according to real pressure data, then an early adjustment amount and an early adjustment time of the opening degree of the airtight valve are determined according to the target pressure wave curve, and then the opening degree of the airtight valve is adjusted according to the early adjustment amount and the early adjustment time so as to simulate a real pressure wave environment. Therefore, the problem that the loading of pressure waves often has time delay due to the fact that the internal space of the real-vehicle-level airtight fatigue test bed is large is solved. The method can accurately load the real pressure wave curve, and ensure the reliability of the air tightness test.
In some possible implementations, after adjusting the air-tight valve opening according to the advance adjustment and the advance adjustment time, the method further includes:
acquiring an actual pressure wave curve, wherein the actual pressure wave curve is generated according to pressure data acquired in a simulated pressure wave environment;
and when the error between the actual pressure wave curve and the target pressure wave curve reaches a preset value, the step of determining the advance adjustment quantity and the advance adjustment time of the opening of the airtight valve according to the target pressure wave curve is re-executed.
In some possible implementations, the determining the lead adjustment and the lead adjustment time of the opening of the air-tight valve according to the target pressure wave curve includes:
identifying a curve section in the target pressure wave curve, wherein the pressure change rate of the curve section is larger than a preset value;
and determining the advance adjustment quantity and the advance adjustment time of the opening of the airtight valve according to the curve section.
In some possible implementations, the advance adjustment of the air-tight valve opening includes an amplitude of the air-tight valve opening in advance;
the adjusting the opening of the airtight valve according to the advance adjustment amount and the advance adjustment time includes:
and opening the airtight valve in advance according to the amplitude of the early opening of the airtight valve and the early adjustment time.
In some possible implementations, the advance adjustment of the opening of the air-tight valve includes an amplitude by which the air-tight valve closes in advance;
the adjusting the opening of the airtight valve according to the advance adjustment amount and the advance adjustment time includes:
and closing the airtight valve in advance according to the amplitude of the closing of the airtight valve in advance and the timing of the adjustment in advance.
In some possible implementations, the method further includes:
acquiring the real pressure data;
and eliminating trend items in the real pressure data to obtain a target pressure wave curve.
In some possible implementations, the eliminating trend terms in the real pressure data includes:
and eliminating a trend term caused by the sensor zero drift in the real pressure data by using a least square method.
In some possible implementations, the eliminating trend terms in the real pressure data includes:
the local barometric pressure is subtracted from the real pressure data to eliminate trend terms caused by pressure differences.
In a second aspect, the application provides an apparatus for simulating a real pressure wave environment, the apparatus comprising:
the communication module is used for acquiring a target pressure wave curve to be loaded, wherein the target pressure wave curve is generated according to real pressure data;
the determining module is used for determining the advance adjustment quantity and the advance adjustment time of the opening of the airtight valve according to the target pressure wave curve;
and the adjusting module is used for adjusting the opening of the airtight valve according to the advanced adjusting quantity and the advanced adjusting time so as to simulate a real pressure wave environment.
In some possible implementations, the communication module is further configured to:
after the opening of the airtight valve is adjusted according to the advance adjustment amount and the advance adjustment time, acquiring an actual pressure wave curve, wherein the actual pressure wave curve is generated according to pressure data acquired in a simulated pressure wave environment;
the determining module is used for:
and when the error between the actual pressure wave curve and the target pressure wave curve reaches a preset value, the step of determining the advance adjustment quantity and the advance adjustment time of the opening of the airtight valve according to the target pressure wave curve is re-executed.
In some possible implementations, the determining module is specifically configured to:
identifying a curve section in the target pressure wave curve, wherein the pressure change rate of the curve section is larger than a preset value;
and determining the advance adjustment quantity and the advance adjustment time of the opening of the airtight valve according to the curve section.
In some possible implementations, the advance adjustment of the air-tight valve opening includes an amplitude of the air-tight valve opening in advance;
the adjusting module is specifically used for:
and opening the airtight valve in advance according to the amplitude of the early opening of the airtight valve and the early adjustment time.
In some possible implementations, the advance adjustment of the opening of the air-tight valve includes an amplitude by which the air-tight valve closes in advance;
the adjusting module is specifically used for:
and closing the airtight valve in advance according to the amplitude of the closing of the airtight valve in advance and the timing of the adjustment in advance.
In some possible implementations, the communication module is further configured to:
acquiring the real pressure data;
the apparatus further comprises:
and the generation module is used for eliminating trend items in the real pressure data and obtaining a target pressure wave curve.
In some possible implementations, the generating module is specifically configured to:
and eliminating a trend term caused by the sensor zero drift in the real pressure data by using a least square method.
In some possible implementations, the generating module is specifically configured to:
the local barometric pressure is subtracted from the real pressure data to eliminate trend terms caused by pressure differences.
In a third aspect, the present application provides an apparatus comprising a processor and a memory. The processor and the memory communicate with each other. The processor is configured to execute instructions stored in the memory to cause the apparatus to perform a method of simulating a real pressure wave environment as in the first aspect or any implementation of the first aspect.
In a fourth aspect, the application provides a computer readable storage medium having instructions stored therein which, when run on a device, cause the device to perform the method of simulating a real pressure wave environment of the first aspect or any implementation of the first aspect described above.
In a fifth aspect, the application provides a computer program product comprising instructions which, when run on a device, cause the device to perform the method of simulating a real pressure wave environment of the first aspect or any implementation of the first aspect.
Further combinations of the present application may be made to provide further implementations based on the implementations provided in the above aspects.
Drawings
In order to more clearly illustrate the technical method of the embodiments of the present application, the drawings used in the embodiments will be briefly described below.
FIG. 1 is a system architecture diagram of a method of simulating a real pressure wave environment provided by an embodiment of the present application;
FIG. 2 is a flow chart of a method of simulating a real pressure wave environment provided by an embodiment of the application;
FIG. 3A is a time domain diagram of pressure waves generated by a rail vehicle prior to filtering according to an embodiment of the present application;
FIG. 3B is a time domain diagram of a pressure wave generated by a filtered rail vehicle according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a gas circuit of a control system according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of an apparatus for simulating a real pressure wave environment according to an embodiment of the present application.
Detailed Description
The embodiments of the present application will be described below with reference to the drawings.
The terms first, second and the like in the description and in the claims and in the above-described figures, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances and are merely illustrative of the manner in which embodiments of the application have been described in connection with the description of the objects having the same attributes.
In order to facilitate understanding of the technical scheme of the present application, some technical terms related to the present application are described below.
The pressure wave refers to an elastic wave in the gas. Unlike solids, gases are relatively easily compressed. When pressure fluctuations are excited in the gas, such as rail vehicles meeting, the density of the gas will change in the same manner as the pressure as the rail vehicles enter the tunnel. The pressure wave in the gas column is also called displacement wave or density wave.
Tightness refers to the gas tightness properties used to detect tightness of pressure vessels. For example, the tightness of the car body of a rail vehicle can be detected by an air tightness test. When the tightness of the carriage is poor, for example, gaps exist, pressure waves can enter the carriage along the gaps, so that parts of the railway vehicle such as doors, windows and the like are damaged, passengers tinnitus and otodynia are caused, and the user experience is seriously affected. Therefore, when a rail vehicle such as a high-speed train is delivered, it is generally possible to perform an air tightness test, and the vehicle delivery is performed after the test is passed.
The air tightness test can be performed specifically by an air tightness fatigue test stand. The airtight fatigue test bed is used for testing the influence of pressure waves on the fatigue strength of the vehicle body base metal and the weld joint so as to determine the air tightness of the vehicle body. By fatigue strength is meant the maximum stress of a material that will not fail under a wireless multiple alternating load. In order to ensure the reliability of the air tightness test, one key is to simulate a real pressure wave environment. The actual pressure wave environment refers to the pressure wave environment of the vehicle during running.
Several methods of simulating a real pressure wave environment have been proposed. For example, a true pressure wave curve is acquired and then loaded in an airtight fatigue test stand. However, the internal space of the airtight fatigue test bed of the real vehicle is large, and the loading of the pressure wave has a delay phenomenon, so that it is difficult to accurately load the real pressure wave curve. The time axis of the loaded pressure wave curve is prolonged, so that the accuracy of the acquired dynamic air tightness test data is not correct, and the reliability of the air tightness test is affected.
In view of the above, the embodiments of the present application provide a method for simulating a real pressure wave environment. The method can be specifically executed by terminal equipment such as a desktop computer, a notebook computer and the like. Specifically, the terminal device acquires a target pressure wave curve generated by real pressure data, then determines the action time and the air intake/exhaust amount of the airtight valve which need to be adjusted in advance according to the target pressure wave curve, namely, determines the early adjustment amount and the early adjustment time of the opening of the airtight valve, and then adjusts the airtight valve according to the early adjustment amount and the early adjustment time, so that the pressure change in the compartment body can be kept consistent with the pressure wave curve (comprising a time axis and a pressure axis) which is expected to be loaded.
Thus, the problem of delay in pressure wave loading is solved. The pressure wave curve loaded by the method cannot be elongated by a time axis, and the acquired dynamic air tightness test data has higher accuracy, so that the reliability of air tightness test is ensured.
The method for simulating a real pressure wave environment provided by the embodiment of the application comprises, but is not limited to, application to the application environment shown in fig. 1. As shown in fig. 1, the scene includes a device 102 and a device 104, where the device 102 is a sensor, such as a pressure sensor, for acquiring real pressure data. The device 104 may be a terminal device such as a desktop computer or a notebook computer, and of course, the device 104 may be other devices with computing capabilities. The device 104 may acquire the actual pressure data acquired by the device 102 and then generate a target pressure wave curve from the actual pressure data.
Specifically, the device 104 acquires a target pressure wave curve to be loaded from the device 102, the target pressure wave curve is a curve generated according to real pressure data, then the device 104 determines an advance adjustment amount and an advance adjustment time of the opening of the air-tight valve according to the target pressure wave curve, and then the device 104 adjusts the opening of the air-tight valve according to the advance adjustment amount and the advance adjustment time so as to simulate a real pressure wave environment.
Next, a method for simulating a real pressure wave environment provided by an embodiment of the present application will be described in detail from the perspective of the device 104.
Referring to the flow chart of the method of simulating a real pressure wave environment shown in FIG. 2, the method comprises:
s202: the device 104 acquires a target pressure wave profile to be loaded.
The target pressure wave curve is a curve generated from real pressure data. The real pressure data specifically refers to pressure data collected during running, such as pressure data generated by a railway vehicle when the railway vehicle meets a vehicle, and pressure data generated by the railway vehicle when the railway vehicle passes through a tunnel. The method for simulating the real pressure wave environment provided by the embodiment of the application is that the airtight fatigue test bed simulates the pressure environment generated when the railway vehicle encounters a car, the pressure environment generated when the railway vehicle passes through a tunnel, and the like.
In particular implementations, the device 104 may acquire real pressure data acquired by the device 102 from which a target pressure wave curve is generated. Considering that the measured pressure data may include many interference signals, the air pressure fluctuation is frequent, and is difficult to directly apply to the loading of the pressure wave of the airtight fatigue test bed, the device 104 may also perform preprocessing on the real pressure data to obtain a target pressure wave curve.
In some possible implementations, preprocessing the real pressure data includes eliminating trend terms in the real pressure data and then generating a target pressure wave curve. The trend term refers to a linear term existing in a random signal or a nonlinear component having a period longer than a recording length, which changes slowly.
The reasons for the trend term generation may include a variety of reasons. Typically, the signal waveform is shifted due to zero drift of the sensor or instrument, instability in low frequency performance outside the sensor frequency range, and ambient interference. The presence of trend terms can lead to significant distortions in correlation analysis and power spectrum analysis, even with a complete loss of realism of the low frequency spectrum.
In an embodiment of the present application, the device 104 may utilize least squares cancellation for trend terms generated by zero drift. For trend terms resulting from pressure differences, the device 104 may eliminate by subtracting the local barometric pressure from the actual pressure data.
After the trend term is eliminated, the true pressure data may also be digitally filtered. For example, the device 104 may filter the real pressure data by a butterworth low pass filter. Wherein, the butterworth low-pass filter can be realized by the following way:
1) Designing passband cut-off frequency and stopband cut-off frequency of the low-pass filter according to the frequency range of the required signal;
2) Normalizing the designed passband cut-off frequency and stopband cut-off frequency;
3) Estimating the order and cut-off frequency of the filter to be designed by using the normalized cut-off frequency and using a button function;
4) According to the estimated order and cut-off frequency, utilizing a button function to design parameters of the digital Butterworth filter;
5) And realizing the Butterworth low-pass filter function by using a filter function according to the designed parameters.
Fig. 3A and 3B show time domain diagrams of pressure waves generated by a rail vehicle passing through a tunnel before and after filtering, respectively. From the figure, noise (interference) in the real pressure wave data can be filtered out more effectively by the Butterworth low-pass filter.
Considering pneumatic load data such as real pressure wave data, the pneumatic load data is often obtained by actual measurement on a whole-course line, and the measured data volume is very large, so that the huge data volume contains a large amount of invalid data. Thus, to extract valid pressure wave data, the device 104 may also intercept the actual pressure wave data measured. The data interception is to remove the non-pressure wave aerodynamic load data, leaving the desired pressure wave load data. The function can be realized by programming by Matlab.
After the data is intercepted, the effective data can be spliced into pressure wave data which are continuous on a time axis, and a target pressure wave curve can be obtained through the pressure wave data. Similar to data interception, data stitching can also be achieved by Matlab programming.
S204: the device 104 determines the lead adjustment and lead adjustment time of the air-tight valve opening from the target pressure wave profile.
The airtight valve is specifically a valve for controlling air intake and air exhaust in an airtight fatigue test bed. The airtight valve opening determines the rate of inlet and outlet air. Intake air, also known as inflation, may produce positive pressure waves and exhaust air, also known as exhaust air, may produce negative pressure waves.
In some implementations, the device 104 may identify a curve interval in the target pressure wave curve where the pressure change rate is greater than a preset value, and then determine the early adjustment amount and the early adjustment time of the air-tight valve opening according to the curve interval. In determining the lead adjustment and lead adjustment time for the air-tight valve opening, the device 104 may determine the lead adjustment and lead adjustment time for the air-tight valve opening in combination with the actual lead adjustment.
S206: the device 104 adjusts the air-tight valve opening according to the advance adjustment and the advance adjustment time to simulate a real pressure wave environment.
In some possible implementations, the advanced adjustment of the opening of the gas-tight valve includes an amplitude of the advanced opening of the gas-tight valve. The device 104 may open the air-tight valve in advance according to the magnitude of the air-tight valve opening in advance and the advance adjustment time.
In other possible implementations, the advanced adjustment of the opening of the air-tight valve includes an amplitude of advanced closing of the air-tight valve. The device 104 may close the air tight valve in advance based on the magnitude of the air tight valve closing in advance and the advance adjustment time.
After adjusting the air-tight valve opening according to the advance adjustment and the advance adjustment time, the device 104 may also acquire an actual pressure wave curve, e.g., measure a corresponding site pressure wave by a sensor, and then generate the actual pressure wave curve. The actual pressure wave curve is a curve generated from pressure data acquired in a simulated pressure wave environment.
When the error between the actual pressure wave curve and the target pressure wave curve reaches a preset value, the device 104 re-executes the steps of determining the advance adjustment amount and the advance adjustment time of the opening of the air-tight valve according to the target pressure wave curve until the error is smaller than the preset value. When the error is smaller than a preset value, a dynamic air tightness or air tightness fatigue test can be carried out.
It should be noted that, when loading pressure wave data, the device 104 may also use a rain flow counting method to program the pressure wave load spectrum. Specifically, the device 104 sequentially extracts each cycle of real pressure data through data compression, peak-valley value extraction, primary rain flow counting and secondary rain flow counting, calculates the average value and the amplitude value in the cycle, counts the frequency corresponding to the average value and the amplitude value, draws a one-dimensional load spectrum and a two-dimensional load spectrum, and draws the two-dimensional load spectrum into a histogram and a curved surface graph so as to observe the frequency condition corresponding to each average value and each amplitude value.
From the foregoing, embodiments of the present application provide a method of simulating a real pressure wave environment. Specifically, the device 104 acquires a target pressure wave curve generated by real pressure data, then determines the action time and the intake/exhaust amount of the airtight valve to be adjusted in advance according to the target pressure wave curve, namely, determines the adjustment in advance and the adjustment in advance of the opening of the airtight valve, and then adjusts the airtight valve according to the adjustment in advance and the adjustment in advance, so that the pressure change in the compartment can be kept consistent with the pressure wave curve (including a time axis and a pressure axis) expected to be loaded.
In the example shown in fig. 2, the simulation of the real pressure wave environment mainly controls the system air path through a control algorithm, so as to realize automatic adjustment of the air path valve and the fan. The hardware system simulating the real pressure wave environment can be divided into three parts, and specifically comprises a mechanical system, an electrical system and a measurement and control system.
The mechanical system consists of an internal loading system and an external loading system, and the reproduction of the pressure wave time domain load in the test box body is realized under the control of measurement and control and electricity. The mechanical system mainly comprises a box body, a positive pressure air storage tank, a negative pressure air storage tank, a fan, a valve group and a pipeline. The box body mainly comprises a box body, a sealing door, a transition door, a sensor bracket and the like. The loading system has the working principle that: and the blower is used for exhausting and inflating, so that positive pressure and negative pressure are loaded on the inside and the outside of the vehicle body.
The box body is a mechanical system body, and can adopt a double-layer structure design, namely, the outer part is designed into a round end face structure, so that the box body is convenient to bear, and the inner part adopts a door-shaped structure, so that the strength and the rigidity of the box body are enhanced. The width of the box body not only ensures that enough clearance is reserved for passing people after the car body is opened in, but also reduces the space to the maximum extent so as to realize the energy-saving effect. The inside both sides of box respectively set up hollow walking board, and its effect is used for the walking of personnel in the experimentation on the one hand, and on the other hand is used for acting as the pipeline of gaseous in the automobile body.
The two sides of the top of the inner side wall of the box body are provided with supports for supporting and fixing the filler. The inner wall of the box body is provided with a pressure sensor mounting bracket, a camera mounting bracket and an illumination mounting bracket, and is used for mounting and fixing a sensor, a camera and an illumination device. The two sides of the door frame at the end part of the box body are respectively provided with observation holes which are made of toughened glass and used for realizing the observation of the internal condition of the box body in the experimental process. The outer wall of the positive pressure air storage tank side of the tank body is provided with a guardrail and a walking board for realizing the cleaning of maintenance personnel. The safety valve is arranged at the top of the box body and used for guaranteeing the safety of the car body and the safety performance of the box body in the experimental process.
The sealing surface is used for realizing the end surface sealing of the box body and mainly comprises a gate, a small gate, a transition channel and a driving mechanism. The gate mainly realizes the end seal of the box body, and mainly comprises a gate main body with travelling wheels, an inflatable sealing ring, a rotary support, a fixed fastening seat, a screw, a fixed positioning pin and the like. The door frame department has rubber transition piece for realize sealedly. The small door mainly realizes the entrance and exit of the test personnel under the closed condition of the large door in the experimental process. The transition channel mainly realizes the butt joint communication of the small door and the test car body in the experimental process, and the sealing door is arranged on the transition channel. The sensor bracket is used for installing all sensors in the box body, including pressure sensors, displacement sensors, temperature and humidity sensors and the like.
The air circuit system mainly comprises components such as a positive pressure air storage tank, a negative pressure air storage tank, a pipeline, a valve group, a fan, a motor, a muffler, an air filter and the like.
The positive pressure air storage tank is used for buffering and storing the applied positive pressure load so as to realize the stable application of the positive pressure load in the tank body and the vehicle body. A pipeline air inlet is arranged on the air storage tank and used for storing high-pressure gas output by the fan; and an air outlet pipeline is arranged at the same time. Meanwhile, safety and maintenance are considered, and a safety valve, a water outlet, a pressure gauge and a maintenance manhole are arranged on the safety valve.
The negative pressure air storage tank is used for buffering and storing the applied negative pressure load so as to realize the stable application of the negative pressure load in the tank body and the vehicle body. An air inlet pipeline and an air outlet pipeline are arranged on the air storage tank and are used for extracting low-pressure air in the tank body through the fan. Meanwhile, safety and maintenance are considered, and a safety valve, a water outlet, a pressure gauge and a maintenance manhole are arranged on the safety valve.
The electric system mainly provides driving power for the test system, realizes driving control of the asynchronous motor-fan, and provides air flow and pressure required by a pressure wave environment. The electric system can perform system protection and alarm, and can be switched between computer control and manual control, so that the computer process control can be realized, manual debugging operation and emergency treatment can be realized, and the system has reliable working redundancy.
The electric system mainly comprises a central control console, a field measurement and control device, a main circuit breaker cabinet, a switch cabinet, a variable frequency cabinet, a soft start cabinet and a motor. The field console is mainly provided with an industrial control computer, a liquid crystal display, an uninterrupted (Uninterruptible Power System/Uninterruptible Power Supply, UPS) power supply, a data acquisition box, a signal photoelectric isolation module, a relay and an operation panel. It can accept instructions from a central console, or self-operating instructions; completing data acquisition and processing of each pressure signal and each displacement signal in the main box body, and uploading the data to a central console; the start and stop of each frequency conversion cabinet and soft start cabinet are completed through the operation panel, the conversion of computer control and means adjustment is carried out through the machine control/manual control change-over switch, and the manual adjustment can be carried out on the panel, so that the frequency conversion control and the soft start are realized.
The central console is provided with a computer workstation, a liquid crystal display, a laser printer, a video switcher and a UPS power supply.
The measurement and control system, also called control system, comprises a central control room. The central control room is the top layer in the whole control system, the start and stop of the whole system can be directly controlled through remote control, and the end point of data flow is also in the central control room. Secondly, the field operation table is mainly responsible for loading the system, collecting data and realizing control functions. At the same time, the microprocessor CompactRIO of the console is directly controlled by the console, and the data of the microcontroller is received and stored, and finally all the data is uploaded to the central control room. The CompactRIO function is the primary control function and can store process variables to the computer.
See the control system air circuit schematic diagram shown in fig. 4. As shown in FIG. 4, the control system mainly comprises 5 fans (1 vacuum pump working at full frequency, 1 vacuum pump working at variable frequency, 1 dual-purpose fan, 1 fan working at variable frequency, 1 fan working at full frequency), 8 pipeline valves, 10 box valves, a positive pressure tank, a negative pressure tank, a box, a sensor, a controller, a computer and the like.
The control of the tank pressure is finally realized by constructing 3 control systems, namely a positive pressure gas storage tank pressure control system, a negative pressure gas storage tank pressure control system and a tank pressure control system by combining the characteristics of the pressure wave expected to be simulated and the control principle of the gas path. The pressure control system of the positive and negative pressure tanks is the basis and premise of tank pressure control, and the control effect of the positive and negative pressure tank control system determines the final tank pressure control effect.
When the air pressure control system is in operation, the blower and vacuum pump are turned on. Firstly, in the gas storage tank energy storage regulation stage, a tank body gas charging valve is closed, a positive pressure gas source is provided by a blower, and at the moment, the positive pressure gas source provided by the blower has two flow directions: the air flows to the atmosphere through an air exhaust valve pipeline and directly flows into a positive pressure air storage tank through a pipeline to store energy; the box air extraction valve is closed, a vacuum pump provides a negative pressure air source, and at the moment, the air pumped by the vacuum pump has two sources: the air is pumped from the atmosphere through the air pumping valves and directly pumped from the negative pressure air storage tank through the pipelines, so that the negative pressure air source energy storage is realized. The air pressure in the positive and negative pressure air storage tanks can be realized by adjusting the air suction valve and the air discharge valve.
Then, after the positive and negative pressure air storage tanks meet the energy storage requirement, the air storage tanks enter an in-vehicle air pressure control stage, and the tank body air charging valve and the tank body air discharging valve are adjusted in a time-sharing mode according to different air charging and air discharging working conditions. And finally, stopping the blower and the vacuum pump, closing the box inflation valve and the box air exhaust valve, and opening the air exhaust valve and the air exhaust valve when the pressure release and stop stage is carried out after the air pressure control system is finished.
The waveform of the real pressure wave can be divided into a rising section and a falling section, and according to the slope of the waveform, a program for marking the rising section and the falling section of the waveform can be written for dividing the whole waveform. The purpose of division of the ascending section and the descending section is to distinguish the working states of the box body air charging valve and the box body air exhausting valve, and only the box body air charging valve is opened in the ascending section, and the box body air exhausting valve is closed; in the descending section, the box body air exhaust valve is opened, and the box body air inflation valve is closed.
The pressure wave can then be loaded as follows:
(1) Placing the test vehicle body into the test box body, sealing the test bed, and starting a test bed software control system;
(2) Introducing a desired pressure wave profile (i.e., a true pressure wave profile) into the system using a control program;
(3) An iterative learning control algorithm in the control program automatically identifies a curve section with severe pressure change in a pressure wave curve, and determines the amplitude (controlling intake/extraction amount) and the required time (millisecond level) of the airtight valve needing to be opened or closed in advance by combining the actual opening and response time of the airtight valve;
(4) Saving airtight valve action (amplitude of opening or closing) and response time data;
(5) Starting an airtight valve control program, reading airtight valve action and response time data, and comparing pressure sensor test data (an actual loaded pressure wave curve) and an expected pressure wave curve (a target pressure wave curve) in the box body through the control program to verify the accuracy of the airtight valve action and response time;
(6) Returning to the step (3) to recalculate the action and response time of the air-tight valve when the errors of the pressure curve in the box body and the expected pressure wave curve are larger;
(7) When the errors of the pressure curve and the expected pressure wave curve in the box body meet the test requirements, the data of the action and the response time of the airtight valve can be directly read in, and a dynamic airtight or airtight fatigue test can be carried out.
The method for simulating a real pressure wave environment provided by the embodiment of the present application is described above with reference to fig. 1 to 4, and the apparatus and device provided by the embodiment of the present application are described below with reference to the accompanying drawings.
Referring to the schematic structural diagram of the apparatus for simulating a real pressure wave environment shown in fig. 5, the apparatus comprises:
the communication module 502 is configured to obtain a target pressure wave curve to be loaded, where the target pressure wave curve is a curve generated according to real pressure data;
a determining module 504, configured to determine an advance adjustment amount and an advance adjustment time of the opening of the airtight valve according to the target pressure wave curve;
and an adjustment module 506, configured to adjust the opening of the air-tight valve according to the advance adjustment amount and the advance adjustment time, so as to simulate a real pressure wave environment.
In some possible implementations, the communication module 502 is further configured to:
after the opening of the airtight valve is adjusted according to the advance adjustment amount and the advance adjustment time, acquiring an actual pressure wave curve, wherein the actual pressure wave curve is generated according to pressure data acquired in a simulated pressure wave environment;
the determining module 504 is configured to:
and when the error between the actual pressure wave curve and the target pressure wave curve reaches a preset value, the step of determining the advance adjustment quantity and the advance adjustment time of the opening of the airtight valve according to the target pressure wave curve is re-executed.
In some possible implementations, the determining module 504 is specifically configured to:
identifying a curve section in the target pressure wave curve, wherein the pressure change rate of the curve section is larger than a preset value;
and determining the advance adjustment quantity and the advance adjustment time of the opening of the airtight valve according to the curve section.
In some possible implementations, the advance adjustment of the air-tight valve opening includes an amplitude of the air-tight valve opening in advance;
the adjusting module 506 is specifically configured to:
and opening the airtight valve in advance according to the amplitude of the early opening of the airtight valve and the early adjustment time.
In some possible implementations, the advance adjustment of the opening of the air-tight valve includes an amplitude by which the air-tight valve closes in advance;
the adjusting module 506 is specifically configured to:
and closing the airtight valve in advance according to the amplitude of the closing of the airtight valve in advance and the timing of the adjustment in advance.
In some possible implementations, the communication module 502 is further configured to:
acquiring the real pressure data;
the apparatus further comprises:
and the generation module is used for eliminating trend items in the real pressure data and obtaining a target pressure wave curve.
In some possible implementations, the generating module is specifically configured to:
and eliminating a trend term caused by the sensor zero drift in the real pressure data by using a least square method.
In some possible implementations, the generating module is specifically configured to:
the local barometric pressure is subtracted from the real pressure data to eliminate trend terms caused by pressure differences.
The present application provides an apparatus for implementing a method of simulating a real pressure wave environment. The apparatus includes a processor and a memory. The processor and the memory communicate with each other. The processor is configured to execute instructions stored in the memory to cause the device to perform a method of simulating a real pressure wave environment.
The present application provides a computer readable storage medium having instructions stored therein that, when run on a device, cause the device to perform the above-described method of simulating a real pressure wave environment.
The present application provides a computer program product containing instructions that, when run on a device, cause the device to perform the above-described method of simulating a real pressure wave environment.
It should be further noted that the above-described apparatus embodiments are merely illustrative, and that the units described as separate units may or may not be physically separate, and that units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, in the drawings of the embodiment of the device provided by the application, the connection relation between the modules represents that the modules have communication connection, and can be specifically implemented as one or more communication buses or signal lines.
From the above description of the embodiments, it will be apparent to those skilled in the art that the present application may be implemented by means of software plus necessary general purpose hardware, or of course by means of special purpose hardware including application specific integrated circuits, special purpose CPUs, special purpose memories, special purpose components, etc. Generally, functions performed by computer programs can be easily implemented by corresponding hardware, and specific hardware structures for implementing the same functions can be varied, such as analog circuits, digital circuits, or dedicated circuits. However, a software program implementation is a preferred embodiment for many more of the cases of the present application. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a readable storage medium, such as a floppy disk, a usb disk, a removable hard disk, a ROM, a RAM, a magnetic disk or an optical disk of a computer, etc., comprising several instructions for causing a computer device (which may be a personal computer, a training device, a network device, etc.) to perform the method according to the embodiments of the present application.
In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product.
The computer program product includes one or more computer instructions. When loaded and executed on a computer, produces a flow or function in accordance with embodiments of the present application, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from one website, computer, training device, or data center to another website, computer, training device, or data center via a wired (e.g., coaxial cable, optical fiber, digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be stored by a computer or a data storage device such as a training device, a data center, or the like that contains an integration of one or more available media. The usable medium may be a magnetic medium (e.g., a floppy Disk, a hard Disk, a magnetic tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a Solid State Disk (SSD)), or the like.
Claims (10)
1. A method of simulating a real pressure wave environment, the method comprising:
acquiring a target pressure wave curve to be loaded, wherein the target pressure wave curve is generated according to real pressure data;
determining the advance adjustment quantity and the advance adjustment time of the opening of the airtight valve according to the target pressure wave curve;
adjusting the opening of the airtight valve according to the advance adjustment quantity and the advance adjustment time so as to simulate a real pressure wave environment;
the determining the advance adjustment amount and the advance adjustment time of the opening of the airtight valve according to the target pressure wave curve comprises the following steps:
identifying a curve section in the target pressure wave curve, wherein the pressure change rate of the curve section is larger than a preset value;
and determining the advance adjustment quantity and the advance adjustment time of the opening of the airtight valve according to the curve section.
2. The method according to claim 1, wherein after adjusting the air-tight valve opening according to the advance adjustment amount and the advance adjustment time, the method further comprises:
acquiring an actual pressure wave curve, wherein the actual pressure wave curve is generated according to pressure data acquired in a simulated pressure wave environment;
and when the error between the actual pressure wave curve and the target pressure wave curve reaches a preset value, the step of determining the advance adjustment quantity and the advance adjustment time of the opening of the airtight valve according to the target pressure wave curve is re-executed.
3. The method according to claim 1 or 2, wherein the advance adjustment of the opening degree of the air-tight valve includes an amplitude of the advance opening of the air-tight valve;
the adjusting the opening of the airtight valve according to the advance adjustment amount and the advance adjustment time includes:
and opening the airtight valve in advance according to the amplitude of the early opening of the airtight valve and the early adjustment time.
4. The method according to claim 1 or 2, wherein the advance adjustment of the opening of the gas-tight valve comprises the magnitude of advance closing of the gas-tight valve;
the adjusting the opening of the airtight valve according to the advance adjustment amount and the advance adjustment time includes:
and closing the airtight valve in advance according to the amplitude of the closing of the airtight valve in advance and the timing of the adjustment in advance.
5. The method according to claim 1 or 2, characterized in that the method further comprises:
acquiring the real pressure data;
and eliminating trend items in the real pressure data to obtain a target pressure wave curve.
6. The method of claim 5, wherein said eliminating trend terms in said real pressure data comprises:
and eliminating a trend term caused by the sensor zero drift in the real pressure data by using a least square method.
7. The method of claim 5, wherein said eliminating trend terms in said real pressure data comprises:
the local barometric pressure is subtracted from the real pressure data to eliminate trend terms caused by pressure differences.
8. An apparatus for simulating a real pressure wave environment, the apparatus comprising:
the communication module is used for acquiring a target pressure wave curve to be loaded, wherein the target pressure wave curve is generated according to real pressure data;
the determining module is used for determining the advance adjustment quantity and the advance adjustment time of the opening of the airtight valve according to the target pressure wave curve;
the adjusting module is used for adjusting the opening of the airtight valve according to the advanced adjusting quantity and the advanced adjusting time so as to simulate a real pressure wave environment;
the determining module is specifically configured to:
identifying a curve section in the target pressure wave curve, wherein the pressure change rate of the curve section is larger than a preset value;
and determining the advance adjustment quantity and the advance adjustment time of the opening of the airtight valve according to the curve section.
9. An electronic device comprising a processor and a memory;
the processor is configured to execute instructions stored in the memory to cause the electronic device to perform the method of simulating a real pressure wave environment of any one of claims 1 to 7.
10. A computer readable storage medium comprising instructions that, when run on a device, cause the device to perform the method of simulating a real pressure wave environment of any one of claims 1 to 7.
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