CN111460667A - 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, comprising the following steps: the method comprises the steps of obtaining 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 amount and the advance adjustment time of the opening degree of the airtight valve according to the target pressure wave curve, and adjusting the opening degree of the airtight valve according to the advance adjustment amount and the advance adjustment time so as to simulate a 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 guaranteed.
Description
Technical Field
The present application relates to the field of vehicles, and in particular, to a method, an apparatus, a device, and a computer-readable storage medium for simulating a real pressure wave environment in a rail vehicle scene.
Background
With the continuous development of rail transit technology, rail vehicles such as high-speed trains run faster and faster. For example, the instantaneous speed per hour of current high speed trains can even reach 574.8 kilometers per hour (km/h). At such a speed, when a vehicle meets or passes through a tunnel, the flow and pressure of the ambient air may change dramatically, creating a pressure wave.
If the air tightness of the vehicle is poor, for example, a gap exists in the vehicle body, pressure waves will enter the vehicle along the gap, on one hand, the components of the vehicle, such as doors, windows and the like, can be damaged, and on the other hand, tinnitus and earache of passengers can be caused, and the user experience is seriously affected. Therefore, it is generally necessary to test the vehicle airtightness when the vehicle is delivered.
At present, the air tightness test of vehicles is mainly realized in an air tightness fatigue test bed. Specifically, the pressure wave is loaded in the airtight fatigue test bed, a real pressure wave environment when the vehicle meets or enters a tunnel is simulated, and the airtightness of the vehicle 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 airtightness test is influenced.
Disclosure of Invention
The application provides a method for simulating a real pressure wave environment, which solves the problem of time delay in pressure wave loading when the real pressure wave environment is simulated in the related technology, can accurately load a real pressure wave curve, and ensures the reliability of air tightness test. The present application further provides an apparatus, a device, 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 present application provides a method of simulating a real pressure wave environment. Specifically, a target pressure wave curve to be loaded is obtained, the target pressure wave curve is generated according to real pressure data, then an advance adjustment amount and an advance 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 advance adjustment amount and the advance adjustment time so as to simulate a real pressure wave environment. Therefore, the problem that the loading of pressure waves is delayed frequently due to the fact that the inner space of the airtight fatigue test bed at the real vehicle level is large is solved. The real pressure wave curve can be accurately loaded, and the reliability of the air tightness test is guaranteed.
In some possible implementations, after adjusting the airtight valve opening according to the advance adjustment amount and the advance adjustment time, the method further includes:
acquiring an actual pressure wave curve, wherein the actual pressure wave curve is a curve generated according to pressure data acquired under 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, re-executing the step of determining the advance adjustment amount and the advance adjustment time of the opening of the airtight valve according to the target pressure wave curve.
In some possible implementations, the determining an advance adjustment amount and an advance adjustment time of the opening degree of the airtight valve according to the target pressure wave profile includes:
identifying a curve interval of the target pressure wave curve, wherein the pressure change rate is larger than a preset value;
and determining the advance adjustment amount and the advance adjustment time of the opening of the air-tight valve according to the curve interval.
In some possible implementations, the advanced adjustment amount of the opening degree of the airtight valve includes a magnitude of the advanced opening of the airtight valve;
the adjusting the opening degree of the airtight valve according to the advance adjustment amount and the advance adjustment time includes:
opening the airtight valve in advance according to the magnitude of the advance opening of the airtight valve and the advance adjustment time.
In some possible implementations, the advanced adjustment amount of the opening of the airtight valve includes a magnitude of the advanced closing of the airtight valve;
the adjusting the opening degree of the airtight valve according to the advance adjustment amount and the advance adjustment time includes:
closing the airtight valve in advance according to the magnitude of the advanced closing of the airtight valve and the advanced adjustment time.
In some possible implementations, the method further includes:
acquiring the real pressure data;
and eliminating the trend term in the real pressure data to obtain a target pressure wave curve.
In some possible implementations, the eliminating a trend term in the real pressure data includes:
and eliminating a trend term caused by zero drift of the sensor in the real pressure data by using a least square method.
In some possible implementations, the eliminating a trend term in the real pressure data includes:
subtracting local atmospheric pressure from the real pressure data to eliminate a trend term caused by a difference in atmospheric pressure.
In a second aspect, the present 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 a curve generated according to real pressure data;
the determining module is used for determining the advance adjusting amount and the advance adjusting 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 amount 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 advanced adjustment amount and the advanced adjustment time, acquiring an actual pressure wave curve, wherein the actual pressure wave curve is a curve generated according to pressure data acquired under a simulated pressure wave environment;
the determining module is configured to:
and when the error between the actual pressure wave curve and the target pressure wave curve reaches a preset value, re-executing the step of determining the advance adjustment amount and the advance adjustment time of the opening of the airtight valve according to the target pressure wave curve.
In some possible implementations, the determining module is specifically configured to:
identifying a curve interval of the target pressure wave curve, wherein the pressure change rate is larger than a preset value;
and determining the advance adjustment amount and the advance adjustment time of the opening of the air-tight valve according to the curve interval.
In some possible implementations, the advanced adjustment amount of the opening degree of the airtight valve includes a magnitude of the advanced opening of the airtight valve;
the adjustment module is specifically configured to:
opening the airtight valve in advance according to the magnitude of the advance opening of the airtight valve and the advance adjustment time.
In some possible implementations, the advanced adjustment amount of the opening of the airtight valve includes a magnitude of the advanced closing of the airtight valve;
the adjustment module is specifically configured to:
closing the airtight valve in advance according to the magnitude of the advanced closing of the airtight valve and the advanced adjustment time.
In some possible implementations, the communication module is further configured to:
acquiring the real pressure data;
the device further comprises:
and the generating module is used for eliminating the trend item in the real pressure data to obtain a target pressure wave curve.
In some possible implementations, the generating module is specifically configured to:
and eliminating a trend term caused by zero drift of the sensor in the real pressure data by using a least square method.
In some possible implementations, the generating module is specifically configured to:
subtracting local atmospheric pressure from the real pressure data to eliminate a trend term caused by a difference in atmospheric pressure.
In a third aspect, the present application provides an apparatus comprising a processor and a memory. The processor and the memory are in communication with each other. The processor is configured to execute the 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 present application provides a computer-readable storage medium having stored therein instructions, which, when run on a device, cause the device to perform a method of simulating a real pressure wave environment as described in the first aspect or any one of the implementations of the first aspect.
In a fifth aspect, the present 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 as described in the first aspect above or any implementation manner of the first aspect.
The present application can further combine to provide more implementations on the basis of the implementations provided by 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 illustrating a method for simulating a real pressure wave environment according to an embodiment of the present disclosure;
FIG. 2 is a flow chart of a method for simulating a real pressure wave environment according to an embodiment of the present disclosure;
FIG. 3A is a time domain diagram of pressure waves generated by a rail vehicle before filtering according to an embodiment of the present disclosure;
FIG. 3B is a time domain diagram of pressure waves generated by a rail vehicle after filtering according to an embodiment of the present disclosure;
fig. 4 is a schematic gas path diagram of a control system according to an embodiment of the present disclosure;
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 scheme in the embodiments provided in the present application will be described below with reference to the drawings in the present application.
The terms "first," "second," and the like in the description and in the claims of the present application and in the above-described drawings 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 descriptive of the various embodiments of the application and how objects of the same nature can be distinguished.
In order to facilitate understanding of the technical solutions of the present application, some technical terms related to the present application are described below.
Pressure waves refer to elastic waves in a gas. Unlike solids, gases are relatively easy to compress. When pressure fluctuations are excited in the gas, such as rail vehicle traffic, the density of the gas will fluctuate in the same manner as the pressure when the rail vehicle enters a tunnel. The pressure wave in the gas column is also called displacement wave or density wave.
Airtightness refers to gas sealing performance for detecting the tightness of a pressure vessel. For example, the tightness of the carriage of the rail vehicle can be detected by means of an air-tightness test. When the carriage is less tight, for example, there is a gap, the pressure wave may enter the carriage along the gap, and then the parts of the rail vehicle, such as doors and windows, may be damaged, and the passengers may have tinnitus and ear pain, which may seriously affect the user experience. Therefore, when delivering a rail vehicle such as a high-speed train, it is generally possible to perform an air-tightness test on the rail vehicle, and to deliver the rail vehicle after the test is passed.
The air tightness test may be performed 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 base material and the welding line of the vehicle body, so that the airtightness of the vehicle body is determined. The fatigue strength refers to the maximum stress at which the material will not break when subjected to a wireless multiple alternating load. In order to ensure the reliability of the airtightness test, it is critical to simulate a real pressure wave environment. The real pressure wave environment refers to the pressure wave environment of the vehicle during operation.
Some methods have been proposed to simulate real pressure wave environments. For example, a true pressure wave profile is acquired and then loaded in an airtight fatigue test rig. However, the internal space of the airtight fatigue test bed of the real vehicle grade is large, and the loading of the pressure wave has a delay phenomenon, so that the real pressure wave curve is difficult to load accurately. The time axis of the loaded pressure wave curve is lengthened, so that the accuracy of the obtained dynamic air tightness test data is not good, and the reliability of the air tightness test is influenced.
In view of the above, the present application provides 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 needing to be adjusted in advance according to the target pressure wave curve, namely determines the advance adjustment amount and the advance adjustment time of the opening of the airtight valve, and then adjusts the airtight valve according to the advance adjustment amount and the advance adjustment time, so that the pressure change in the compartment body can be consistent with the expected loaded pressure wave curve (comprising a time axis and a pressure axis).
Thus, the problem of time delay in pressure wave loading is solved. The pressure wave curve loaded by the method cannot be elongated by a time axis, the acquired dynamic air tightness test data has high accuracy, and the reliability of the air tightness test is guaranteed.
The method for simulating the real pressure wave environment provided by the embodiment of the application includes but is not limited to application in the application environment as shown in fig. 1. As shown in fig. 1, the scene includes a device 102 and a device 104, wherein the device 102 is a sensor, such as a pressure sensor, for collecting 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 also be other devices having computing capabilities. The device 104 may acquire real pressure data acquired by the device 102 and then generate a target pressure wave curve from the real pressure data.
Specifically, the device 104 acquires a target pressure wave curve to be loaded from the device 102, the target pressure wave curve being a curve generated from real pressure data, then the device 104 determines an advance adjustment amount and an advance adjustment time of the airtight valve opening according to the target pressure wave curve, and then the device 104 adjusts the airtight valve opening according to the advance adjustment amount and the advance adjustment time to simulate a real pressure wave environment.
Next, a method for simulating a real pressure wave environment provided by the embodiment of the present application will be described in detail from the perspective of the device 104.
Referring to fig. 2, a flow chart of a method of simulating a real pressure wave environment, the method comprising:
s202: the device 104 acquires a target pressure wave profile to be loaded.
The target pressure wave profile is a profile generated from real pressure data. The real pressure data specifically refers to pressure data acquired in the operation process, such as pressure data generated when rail vehicles meet, and pressure data generated when the rail vehicles pass through a tunnel. The method for simulating the real pressure wave environment provided by the embodiment of the application is a pressure environment generated when the rail vehicle is met on the airtight fatigue test bed, a pressure environment generated when the rail 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 profile is generated. Considering that the measured pressure data may include many interference signals, the pressure fluctuation is frequent, and it is difficult to directly apply the pressure waves to the airtight fatigue test bed, therefore, the device 104 may also preprocess the real pressure data to obtain the target pressure wave curve.
In some possible implementations, preprocessing the real pressure data includes eliminating a trend term in the real pressure data and then generating a target pressure wave curve. By trend term is meant a linear term or slowly varying non-linear component of a period greater than the recording length that is present in a random signal.
The reasons for the trend term may include a variety of reasons. The signal waveform is generally shifted due to zero drift of the sensor or the instrument, instability of low-frequency performance outside the sensor frequency range, and interference of the surrounding environment. The presence of the trending term may cause significant distortions in the correlation analysis and power spectrum analysis, even rendering the low frequency spectrum completely untrue.
In the embodiment of the present application, the device 104 may eliminate the trend term generated by the zero drift by using a least square method. The trend term for the pressure difference may be eliminated by the device 104 by subtracting the local atmospheric pressure from the real pressure data.
After the trend term is eliminated, the real pressure data can also be digitally filtered. For example, the device 104 may filter the real pressure data through a butterworth low pass filter. Wherein, the Butterworth low-pass filter can be realized by the following modes:
1) designing the passband cut-off frequency and the 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 the designed stopband cut-off frequency;
3) estimating the order and the cut-off frequency of the filter to be designed by utilizing the normalized cut-off frequency and a button function;
4) designing parameters of the digital Butterworth filter by using a button function according to the estimated order and cut-off frequency;
5) and realizing the function of the Butterworth low-pass filter by utilizing the filter function according to the designed parameters.
Fig. 3A and 3B show time domain graphs of pressure waves generated by the rail vehicle passing through the tunnel before and after filtering, respectively. As can be seen from the figure, the noise (interference) in the real pressure wave data can be more effectively filtered by the butterworth low-pass filter.
Considering that pneumatic load data such as real pressure wave data are often obtained by actual measurement on a whole-course line, the measured data volume is very large, and the huge data volume contains a large amount of invalid data. Thus, to extract valid pressure wave data, the device 104 may also intercept actual pressure wave data measured. Data interception is to remove the non-pressure wave aerodynamic loading data, leaving the required pressure wave loading data. The function can be specifically realized by a programming sequence of Matlab.
It should be noted that after the data interception is performed, the effective data can be spliced into continuous pressure wave data on a time axis, and a target pressure wave curve is obtained thereby. Similar to data interception, data splicing can also be implemented by programming in Matlab.
S204: the device 104 determines an advance adjustment amount and an advance adjustment time of the opening degree of the airtight valve from the target pressure wave profile.
The air-tight valve is a valve for controlling air intake and air exhaust in an air-tight fatigue test bed. The air-tight valve opening determines the rate of air intake and air output. Intake, also known as inflation, may produce positive pressure waves and exhaust, also known as aspiration, may produce negative pressure waves.
In some implementations, the device 104 may first identify a curve interval in the target pressure wave curve in which the pressure change rate is greater than a preset value, and then determine an advance adjustment amount and an advance adjustment time of the opening degree of the airtight valve according to the curve interval. In determining the advance adjustment amount and the advance adjustment time of the airtight valve opening degree, the device 104 may determine the advance adjustment amount and the advance adjustment time of the airtight valve opening degree in conjunction with the actual advance adjustment amount.
S206: the device 104 adjusts the opening degree of the airtight valve according to the advanced adjustment amount and the advanced adjustment time to simulate a real pressure wave environment.
In some possible implementations, the advanced adjustment amount of the opening degree of the airtight valve includes a magnitude of the advanced opening of the airtight valve. The device 104 may open the airtight valve in advance according to the magnitude of the advance opening of the airtight valve and the advance adjustment time.
In other possible implementations, the advanced adjustment amount of the opening of the airtight valve includes a magnitude of the advanced closing of the airtight valve. Device 104 may close the airtight valve in advance according to the magnitude of the advanced closing of the airtight valve and the advanced adjustment time.
After adjusting the opening of the airtight valve according to the advanced adjustment amount and the advanced adjustment time, the device 104 may further acquire an actual pressure wave curve, for example, by measuring a corresponding site pressure wave through a sensor, and then generate an actual pressure wave curve. The actual pressure wave profile is a profile 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 step of determining the advance adjustment amount and the advance adjustment time of the opening degree of the airtight valve according to the target pressure wave curve until the error is smaller than the preset value. When the error is less than the 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 compile a pressure wave load spectrum. Specifically, the device 104 compresses the real pressure data, extracts a peak-valley value, performs primary rain flow counting and secondary rain flow counting, sequentially extracts each cycle, calculates a mean value and an amplitude value in the cycle, counts frequencies corresponding to the mean 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 frequency conditions corresponding to each mean value and each amplitude value.
From the above, the present application provides a method for 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 air intake/exhaust amount of the airtight valve needing to be adjusted in advance according to the target pressure wave curve, namely determines the advance adjustment amount and the advance adjustment time of the opening degree of the airtight valve, and then adjusts the airtight valve according to the advance adjustment amount and the advance adjustment time, so that the pressure change in the compartment body can be consistent with the expected loaded pressure wave curve (including the time axis and the pressure axis).
In the example shown in fig. 2, the simulation of the real pressure wave environment mainly controls the gas circuit of the system through a control algorithm, so as to realize the automatic adjustment of the gas circuit valve and the fan. The hardware system for simulating the real pressure wave environment can be divided into three parts, specifically comprising 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 reappearance of the time-domain load of the pressure wave in the test box 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 main body, a sealing door, a transition door, a sensor bracket and the like. The loading system has the working principle that: the blower is used for air suction and inflation, so that positive pressure and negative pressure are loaded inside and outside the vehicle body.
The box body main part is the main part of mechanical system, and it can adopt bilayer structure's design, and the external design is circular end face structure promptly, is convenient for bear, and inside adopts door shape structure, strengthens the intensity and the rigidity of box. The width in the box body not only ensures that enough clearance is left for personnel to pass through after the automobile body is driven in, but also reduces the space to the maximum extent so as to realize the energy-saving effect. The two sides in the box body are respectively provided with a hollow walking platform, and the walking platform is used for walking of personnel in the experimental process and is used as a pipeline for gas in the car body.
The both sides of box inside wall top are equipped with the support for realize the support and the fixed to 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 the pressure sensor mounting bracket, the camera mounting bracket and the illumination mounting bracket are used for mounting and fixing the sensor, the camera and the illumination device. And observation holes are respectively formed in two sides of the door frame at the end part of the box body and are made of toughened glass, so that the observation of the internal condition of the box body in the experimental process is realized. The outer wall of the positive pressure gas storage tank side of the box body is provided with a guardrail and a walking platform, and the guardrail and the walking platform are used for cleaning maintenance personnel. The top of the box body is provided with a safety valve for ensuring the safety of the vehicle 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 large door, a small door, a transition channel and a driving mechanism. The gate mainly realizes the end sealing of the box body and mainly comprises a gate main body with traveling wheels, an inflatable sealing ring, a rotary support, a fixed fastening seat, a screw, a fixed positioning pin and the like. The door frame is provided with a rubber transition block for realizing sealing. The small door mainly realizes the entrance and exit of testers under the condition that the large door is closed in the experimental process. The transition passage mainly realizes the butt joint UNICOM of little door and experimental automobile body in the experimentation, sets up sealing door above it. The sensor support is used for installing all sensors in the box body, and the sensors comprise a pressure sensor, a displacement sensor, a temperature and humidity sensor and the like.
The gas circuit system mainly comprises components such as a positive pressure gas storage tank, a negative pressure gas storage tank, a pipeline, a valve group, a fan, a motor, a silencer, an air filter and the like.
The positive pressure air storage tank is used for buffering and storing energy of applied positive pressure load so as to realize stable application of the positive pressure load in the box body and the vehicle body. The gas storage tank is provided with a pipeline gas inlet 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 device.
The negative pressure gas storage tank is used for buffering and storing energy of applied negative pressure load so as to realize stable application of negative pressure load in the box body and the vehicle body. The gas storage tank is provided with a gas inlet pipeline and a gas outlet pipeline for pumping low-pressure gas in the tank body through a 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 device.
The electric system mainly provides driving power for the test system, realizes the driving control of the asynchronous motor-fan and provides air flow and pressure required by a pressure wave environment. The electric system can carry out system protection and alarm, can be switched between computer control and manual control, can realize computer process control and manual debugging operation and emergency treatment, and has reliable working redundancy.
The electric system mainly comprises a central control console, a field measuring and controlling device, a main circuit breaking cabinet, a switch cabinet, a frequency conversion cabinet, a soft start cabinet and a motor. The field control console is mainly provided with an industrial control computer, a liquid crystal display, an Uninterruptible Power System (UPS), a data acquisition box, a signal photoelectric isolation module, a relay and an operation panel. It can receive the instruction from the central control desk or operate the instruction by oneself; data acquisition and processing of each pressure signal and displacement signal in the main box body are completed and uploaded to a central console; the start and stop of each frequency conversion cabinet and the soft start cabinet are completed through the operation panel, the computer control and means adjustment are converted through the machine control/manual control change-over switch, manual adjustment can be carried out on the panel, and frequency conversion control and soft start are realized.
The central control desk 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 topmost 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. And the field operation platform is mainly responsible for loading the system, acquiring data and realizing a control function. Meanwhile, the microprocessor CompactRIO of the console is directly controlled by the console, and the data of the microcontroller is received and stored, and finally the whole data is uploaded to the central control room. The CompactRIO function is to perform the primary control function and to store the process variables to the computer.
See the schematic diagram of the control system gas circuit shown in fig. 4. As shown in fig. 4, the control system mainly includes 5 fans (1 vacuum pump working in full frequency, 1 vacuum pump working in frequency conversion, 1 dual-purpose fan, 1 blower working in frequency conversion, 1 blower working in full frequency), 8 pipeline valves, 10 tank valves, a positive pressure tank, a negative pressure tank, a sensor, a controller, a computer, and the like.
The characteristics of expected simulated pressure wave forms and the control principle of the gas circuit are combined, and the control of the box body 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 box body pressure control system. The pressure control system of the positive pressure tank and the negative pressure tank is the basis and the premise of tank body pressure control, and the control effect of the positive pressure tank and the negative pressure tank control system determines the final tank body pressure control effect.
When the air pressure control system works, the blower and the vacuum pump are turned on. Firstly, in the stage of energy storage and adjustment of the gas storage tank, the inflation valve of the tank body is closed, a positive pressure gas source is provided by the blower, and 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 for energy storage; the box bleeder valve is closed, provides the negative pressure air supply by the vacuum pump, and the air that the vacuum pump was taken away this moment has two sources: air is pumped from the atmosphere through the air pumping valves and directly pumped from the negative pressure air storage tank through the pipeline, and negative pressure air source energy storage is achieved. The air pressure in the positive and negative pressure air storage tank can be adjusted by the air pumping valve and the air exhaust valve.
Then, after the positive and negative pressure gas storage tank meets the energy storage requirement, the air pressure control stage in the vehicle is started, and at the moment, the gas charging valve and the gas exhaust valve of the tank body are adjusted in different time periods according to different gas charging and gas exhaust working conditions. And finally, after the air pressure control system is finished, performing a pressure relief shutdown stage, stopping the air blower and the vacuum pump, closing the box inflation valve and the box suction valve, and opening the air exhaust valve and the air exhaust valve.
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, programs for identifying the rising section and the falling section of the waveform can be written for dividing the whole waveform. The ascending section and the descending section are divided for distinguishing the working states of a box body inflation valve and a box body suction valve, only the box body inflation valve is opened in the ascending section, and the box body suction valve is closed; in the descending section, the air suction valve of the box body is opened, and the air charging valve of the box body is closed.
The pressure wave can then be loaded as follows:
(1) placing the test vehicle body into a 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 interval with violent pressure change in a pressure wave curve, and determines the amplitude (controlling air intake/exhaust amount) and the required time (millisecond magnitude) of the air-tight valve needing to be opened or closed in advance by combining the actual opening and response time of the air-tight valve;
(4) storing airtight valve action (amplitude of opening or closing) and response time data;
(5) starting an airtight valve control program, reading in the action and response time data of the airtight valve, comparing the test data (actually loaded pressure wave curve) of the pressure sensor in the box body with an expected pressure wave curve (target pressure wave curve) through the control program, and verifying the accuracy of the action and response time of the airtight valve;
(6) when the error between the pressure curve in the box body and the expected pressure wave curve is large, returning to the step (3), and recalculating the action and the response time of the airtight valve;
(7) when the error between the pressure curve in the box body and the expected pressure wave curve meets the test requirement, the action and response time data 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 the device provided by the embodiment of the present application are described next with reference to the accompanying drawings.
Referring to fig. 5, a schematic structural diagram of an apparatus for simulating a real pressure wave environment is shown, the apparatus comprising:
a communication module 502, 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 adjusting module 506, configured to adjust the opening of the airtight valve according to the advanced adjustment amount and the advanced 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 advanced adjustment amount and the advanced adjustment time, acquiring an actual pressure wave curve, wherein the actual pressure wave curve is a curve generated according to pressure data acquired under 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, re-executing the step of determining the advance adjustment amount and the advance adjustment time of the opening of the airtight valve according to the target pressure wave curve.
In some possible implementations, the determining module 504 is specifically configured to:
identifying a curve interval of the target pressure wave curve, wherein the pressure change rate is larger than a preset value;
and determining the advance adjustment amount and the advance adjustment time of the opening of the air-tight valve according to the curve interval.
In some possible implementations, the advanced adjustment amount of the opening degree of the airtight valve includes a magnitude of the advanced opening of the airtight valve;
the adjusting module 506 is specifically configured to:
opening the airtight valve in advance according to the magnitude of the advance opening of the airtight valve and the advance adjustment time.
In some possible implementations, the advanced adjustment amount of the opening of the airtight valve includes a magnitude of the advanced closing of the airtight valve;
the adjusting module 506 is specifically configured to:
closing the airtight valve in advance according to the magnitude of the advanced closing of the airtight valve and the advanced adjustment time.
In some possible implementations, the communication module 502 is further configured to:
acquiring the real pressure data;
the device further comprises:
and the generating module is used for eliminating the trend item in the real pressure data to obtain a target pressure wave curve.
In some possible implementations, the generating module is specifically configured to:
and eliminating a trend term caused by zero drift of the sensor in the real pressure data by using a least square method.
In some possible implementations, the generating module is specifically configured to:
subtracting local atmospheric pressure from the real pressure data to eliminate a trend term caused by a difference in atmospheric pressure.
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 are in communication with each other. The processor is configured to execute the 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 stored therein instructions 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 which, when run on a device, cause the device to perform the above-described method of simulating a real pressure wave environment.
It should be noted that the above-described embodiments of the apparatus are merely schematic, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiments of the apparatus provided in the present application, the connection relationship between the modules indicates that there is a communication connection therebetween, and may be implemented as one or more communication buses or signal lines.
Through the above description of the embodiments, those skilled in the art will clearly understand that the present application can be implemented by software plus necessary general-purpose hardware, and certainly can also be implemented by special-purpose hardware including special-purpose integrated circuits, special-purpose CPUs, special-purpose memories, special-purpose components and the like. Generally, functions performed by computer programs can be easily implemented by corresponding hardware, and specific hardware structures for implementing the same functions may be various, such as analog circuits, digital circuits, or dedicated circuits. However, for the present application, the implementation of a software program is more preferable. Based on such understanding, the technical solutions of the present application may be substantially embodied in the form of a software product, which is 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, and includes several instructions for enabling a computer device (which may be a personal computer, an exercise device, or a network device) to execute the method according to the embodiments of the present application.
In the above embodiments, the implementation may be wholly or partially realized 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 instructions may be stored in or transmitted from a computer-readable storage medium to another computer-readable storage medium, e.g., a website site, computer, training device, or data center, via wire (e.g., coaxial cable, fiber optics, digital subscriber line (DS L)) or wireless (e.g., infrared, wireless, microwave, etc.) methods.
Claims (11)
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 a curve generated according to real pressure data;
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;
and adjusting the opening degree of the airtight valve according to the advanced adjustment amount and the advanced adjustment time so as to simulate a real pressure wave environment.
2. The method according to claim 1, wherein after adjusting the airtight valve opening degree 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 a curve generated according to pressure data acquired under 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, re-executing the step of determining the advance adjustment amount and the advance adjustment time of the opening of the airtight valve according to the target pressure wave curve.
3. The method of claim 1, wherein determining an amount and time of advance adjustment of the opening of the airtight valve from the target pressure wave profile comprises:
identifying a curve interval of the target pressure wave curve, wherein the pressure change rate is larger than a preset value;
and determining the advance adjustment amount and the advance adjustment time of the opening of the air-tight valve according to the curve interval.
4. The method of claim 3, wherein the advanced adjustment of the airtight valve opening comprises a magnitude of the advanced opening of the airtight valve;
the adjusting the opening degree of the airtight valve according to the advance adjustment amount and the advance adjustment time includes:
opening the airtight valve in advance according to the magnitude of the advance opening of the airtight valve and the advance adjustment time.
5. The method of claim 3, wherein the advanced adjustment of the airtight valve opening comprises a magnitude of advanced closing of the airtight valve;
the adjusting the opening degree of the airtight valve according to the advance adjustment amount and the advance adjustment time includes:
closing the airtight valve in advance according to the magnitude of the advanced closing of the airtight valve and the advanced adjustment time.
6. The method according to any one of claims 1 to 5, further comprising:
acquiring the real pressure data;
and eliminating the trend term in the real pressure data to obtain a target pressure wave curve.
7. The method of claim 6, wherein eliminating the trend term in the real pressure data comprises:
and eliminating a trend term caused by zero drift of the sensor in the real pressure data by using a least square method.
8. The method of claim 6, wherein eliminating the trend term in the real pressure data comprises:
subtracting local atmospheric pressure from the real pressure data to eliminate a trend term caused by a difference in atmospheric pressure.
9. 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 a curve generated according to real pressure data;
the determining module is used for determining the advance adjusting amount and the advance adjusting 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 amount and the advanced adjusting time so as to simulate a real pressure wave environment.
10. An apparatus, comprising a processor and a memory;
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 as claimed in any one of claims 1 to 8.
11. A computer readable storage medium comprising instructions which, 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 8.
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