CN112050854A - Impact jet flow pressure vibration composite measurement device and impact jet flow pressure vibration composite measurement method - Google Patents
Impact jet flow pressure vibration composite measurement device and impact jet flow pressure vibration composite measurement method Download PDFInfo
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- CN112050854A CN112050854A CN202010912012.7A CN202010912012A CN112050854A CN 112050854 A CN112050854 A CN 112050854A CN 202010912012 A CN202010912012 A CN 202010912012A CN 112050854 A CN112050854 A CN 112050854A
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- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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Abstract
The invention discloses an impact jet flow pressure vibration composite measuring device and an impact jet flow pressure vibration composite measuring method, which comprise the following steps: the device comprises an impact jet flow generating device, a measuring head, a charge amplifier, a data acquisition and transmission card and an upper computer. The impact jet flow generating device generates impact jet flow, the measuring head monitors impact jet flow pressure, the measuring head is connected with the charge amplifier, the charge amplifier is connected with the data acquisition and transmission card, the data acquisition and transmission card is provided with a wireless data transmitting module, data are transmitted through wireless signals, the upper computer is provided with a wireless data receiving module and receives jet flow pressure data from the data acquisition and transmission card, the upper computer is provided with LabView software and analyzes and processes the jet flow pressure data to obtain impact jet flow pressure and vibration data, the pressure data are displayed on a display screen of the upper computer, and the vibration data are stored in the upper computer in a form. By the impact jet flow pressure vibration composite measuring device and the pressure vibration composite measuring method thereof, the transient pressure of the impact jet flow and the pressure change and vibration signals of the impact pressure within a period of time can be obtained simultaneously, the instantaneous impact water pressure and the pressure change of the jet flow can be monitored in real time, and the problem that the jet flow impact pressure is difficult to monitor in real time in the prior art is solved.
Description
Technical Field
The invention relates to the technical field of monitoring equipment, in particular to an impact jet flow pressure vibration composite measuring device and an impact jet flow pressure vibration composite measuring method.
Background
The high-pressure water jet technology is a novel technology taking high-speed water flow as an energy carrier, is used as a cleaning, cutting and crushing tool, has unique superiority, and is widely applied to the industries of light industry, machinery, construction, mining, petroleum, chemical industry, nuclear energy, military industry, aerospace, automobile and medicine.
The jet impact mode and the impact pressure are important parameters for various operations. Impact jet flow is used in many operations, and the impact pressure of the jet flow and the operation effect are influenced due to the abrasion of a nozzle, the target distance and the change of the jet flow inclination angle in the working process. Therefore, the method has important significance for monitoring the jet impact pressure in real time.
The pressure change of the impact jet is usually in the microsecond order of magnitude, the traditional jet pressure measuring means basically measures the pressure average value in a time period, the reflected pressure fluctuation is also the average state of the impact pressure in the time period, the pressure of the jet cannot be measured in a few microseconds, and the requirement on real-time monitoring of the impact jet cannot be met, so that a device capable of measuring the instantaneous pressure of the jet and reflecting the real-time change of the pressure of the impact jet is urgently needed.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defects that the instantaneous pressure of the impact jet is difficult to measure and the vibration change characteristic of the jet pressure is difficult to obtain in the prior art, thereby providing the impact jet pressure vibration composite measuring device and method.
The invention relates to an impact jet flow pressure vibration composite measuring device, which comprises: the device comprises an impact jet flow generating device, a measuring head, a charge amplifier, a data acquisition and transmission card and an upper computer.
The impact jet flow generating device comprises a water tank, a plunger pump, an overflow valve, a pressure gauge, a high-pressure pipe, a test board and a nozzle; the inlet of the plunger pump is placed into the water tank, and the outlet of the plunger pump is connected with the high-pressure pipe; the inlet of the overflow valve is connected with the outlet of the plunger pump, and the outlet of the overflow valve is placed in the water tank; the high-pressure pipe outlet is provided with an external thread, the nozzle inlet is provided with an internal thread, and the high-pressure pipe is fixedly connected with the nozzle through thread matching; the nozzle is installed on the test board, and the pressure gauge is connected to the high-pressure pipe.
The impact jet generating device can be any jet generating device such as a pulse jet generating device, a high-pressure water jet generating device and the like.
The measuring head comprises an outer shell, a waterproof ring, an elastic diaphragm, a thin film piezoelectric sensor, an inner shell and a fastening screw rod; the shell comprises a thin-wall cylinder and a bottom, the bottom is provided with a round hole, and the thin-wall cylinder and the bottom are integrally formed; the inner shell comprises a circular truncated cone and a cylindrical boss, and the circular truncated cone and the cylindrical boss are integrally formed; the cylindrical boss is inserted into the thin-wall cylinder to form clearance fit, and the bottom limits the cylindrical boss; and a threaded hole of the fastening screw penetrates through the thin-wall cylinder and the circular truncated cone, and the fastening screw is screwed to connect the outer shell and the inner shell.
One end of the bottom part, which is close to the cylindrical boss, is provided with a circular groove, and the waterproof ring is arranged in the circular groove; the elastic membrane and the thin film piezoelectric sensor are positioned between the waterproof ring and the cylindrical boss, the elastic membrane is close to the waterproof ring, the thin film piezoelectric sensor is close to the cylindrical boss, the elastic membrane and the thin film piezoelectric sensor are both circular, the center of the elastic membrane is aligned to the center of the circular hole at the bottom, and the diameter of the elastic membrane is the same as the inner diameter of the thin-wall cylinder; the circular hole is positioned in the center of the bottom; the impact jet can directly impact on the elastic diaphragm through the round hole at the bottom; after the fastening screw is screwed down, the waterproof ring, the elastic membrane and the thin film piezoelectric sensor are extruded on the bottom by the cylindrical boss under the pressure of the fastening screw.
The depth of the annular groove is one half of the thickness of the waterproof ring and is used for limiting the position of the waterproof ring, the waterproof ring is made of rubber, the elastic membrane is extruded by the inner shell to press the waterproof ring at the bottom of the outer shell, so that the waterproof ring seals the round hole at the bottom of the outer shell and prevents jet flow from penetrating into the measuring head.
When the elastic diaphragm extrudes the waterproof ring, a reaction force is also given to the elastic diaphragm when the waterproof ring presses the elastic diaphragm and the film piezoelectric sensor together, so that uneven contact between the elastic diaphragm and the film piezoelectric sensor caused by size deviation of parts of the measuring head or abrasion of the parts after the measuring head is used for a period of time is prevented, and the elastic diaphragm is more accurate in transmitting impact jet pressure to the film piezoelectric sensor.
The top end and the side surface of the cylindrical boss are both provided with wire grooves, the center of the film piezoelectric sensor is aligned with the center of the elastic diaphragm, and the wires of the film piezoelectric sensor are placed in the wire grooves.
The elastic diaphragm is made of elastic steel, the thickness of the elastic diaphragm is 0.1 mm-2 mm, and different thicknesses are selected according to different working pressures of the impact jet flow; the elastic diaphragm is wear-resistant, high in toughness and excellent in fatigue resistance, can transmit jet impact pressure instantly and can keep working for a long time.
The impact jet flow has great erosion force on an impacted material under long-time impact, the elastic diaphragm is arranged between the impact jet flow and the thin film piezoelectric sensor, the elastic diaphragm receives direct impact of the impact jet flow and transmits impact pressure to the thin film piezoelectric sensor, and the loss of the thin film piezoelectric sensor can be reduced to the maximum extent; and the elastic membrane is cheap and convenient to replace after being damaged.
The elastic diaphragm generates elastic deformation after receiving impact jet pressure and transmits the pressure to the thin film piezoelectric sensor, and the thin film piezoelectric sensor generates polarization phenomenon after being pressed to generate a charge signal; the thin film piezoelectric sensor is sensitive to pressure change, can sense weak pressure change of impact jet flow and can generate charge signals with equal strength.
The charge amplifier is provided with a resistance voltage conversion module and converts a charge signal into a voltage signal which linearly changes with impact force after receiving the charge signal of the thin film piezoelectric sensor; and the charge amplifier can amplify the voltage signal by 1 to 100 times in an equal ratio according to different measurement occasions.
The lead between the film piezoelectric sensor and the charge amplifier is wrapped by tinfoil, and a tinfoil connecting lead is buried underground or a grounding wire so as to shield the interference of external electromagnetic noise.
The data acquisition transmission card comprises a data acquisition module and a wireless data transmitting module, and the data acquisition transmission card acquires the voltage signal amplified by the charge amplifier at a high speed and wirelessly transmits the acquired data to the upper computer.
The data acquisition module adopts the multichannel to gather voltage signal, is furnished with automatic gain scanning circuit, sets up suitable gain value for the sampling channel in the sampling process, and sampling frequency is high, and the acquisition volume is big, can gather 10 to 1000 data in 1 microsecond, guarantees that the impact jet pressure data of gathering is the instantaneous pressure value.
The wireless data transmitting module adopts a LoRa spread spectrum modulation technology, so that the signal penetrability is good, the power consumption is low, the data encryption is good, the transmission distance can reach 2-5 kilometers, and the real-time monitoring of impact jet is not limited by a field; a plurality of loRa nodes of a loRa gateway can be adopted to realize multi-point position monitoring.
The upper computer is provided with a wireless data receiving module and LabView software, the wireless data receiving module receives voltage data of the data acquisition transmission card, the LabView software processes and analyzes the voltage data to obtain impact jet pressure and a vibration signal, a jet pressure waveform diagram in a period of time is displayed on a monitoring interface of the LabView software, and the jet vibration signal is stored in the upper computer; the monitoring interface of the LabView software is provided with two indicator lamps, namely a low-pressure yellow lamp and a high-pressure red lamp; when the transient water pressure of the jet flow is lower than the low water pressure threshold value, the yellow lamp is lighted, and when the transient water pressure of the jet flow is higher than the high water pressure threshold value, the red lamp is lighted.
The impact jet pressure and vibration composite measuring method is used for monitoring the jet impact pressure in real time, and the plunger pump generates high-pressure water; high-pressure water enters the nozzle through the high-pressure pipe to generate impact jet; the impact jet flow impacts the measuring head to transmit impact pressure to the elastic diaphragm; the elastic diaphragm is pressed to generate elastic deformation, and the thin film piezoelectric sensor is extruded; the film piezoelectric sensor generates a charge signal which is in positive correlation with the extrusion force after being extruded; the charge signal is amplified by the charge amplifier and converted into a proportional voltage signal; the voltage signals are continuously collected by the data collecting and transmitting card and transmitted to the upper computer for analysis and processing to form jet pressure waveforms which are displayed on the display screen of the upper computer.
The position of the nozzle is fixed, the measuring head is installed on a test bench, the center of the measuring head is aligned with the center of the outlet of the nozzle, a sliding rail is arranged at the bottom of the test bench, and the measuring head can freely move on the sliding rail along the axial direction of the jet beam so as to adjust the distance between the nozzle and the measuring head.
And the upper computer receives the voltage signal, displays a jet pressure data oscillogram through the LabView software after analyzing and processing the data, and records time-pressure data in a table so as to meet the requirements of real-time monitoring and subsequent analysis of the jet pressure.
The left side of the monitoring interface of the LabView software is a hardware parameter area and a sampling setting area, the right side of the monitoring interface is a pressure threshold area, the upper limit and the lower limit of pressure can be set, a lamp is turned on when the pressure threshold area exceeds the limit value for warning, a start and stop switch is arranged at the upper right side, and a jet flow pressure waveform graph display area is arranged at the lower side.
The technical scheme of the invention has the following advantages:
1. the impact jet flow pressure vibration composite measuring device provided by the invention can measure the pressure value of the impact jet flow at any instant, rather than the average value in a period of time.
2. The impact jet pressure vibration composite measuring device provided by the invention can completely measure and store the change characteristic of the impact jet pressure by continuously sampling the impact jet pressure at a high speed in a large quantity.
3. According to the impact jet flow pressure vibration composite measuring device provided by the invention, the wireless data transmitting module and the wireless data receiving module are adopted, so that the measuring device is not limited by a field when in use, can be used for monitoring at any place within a wireless receiving range, can be provided with a plurality of wireless receiving nodes, and can realize multi-directional monitoring when in impact jet flow monitoring.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural diagram of an impact jet pressure vibration composite measuring device of the present invention;
fig. 2 is a schematic structural diagram of the measuring head in fig. 1;
fig. 3 is a schematic view of an exploded structure of the probe shown in fig. 2;
FIG. 4 is a monitoring interface diagram of LabView software;
description of reference numerals:
101-a housing; 102-a waterproof ring; 103-an elastic membrane; 104-thin film piezoelectric sensors; 105-an inner shell; 106-fastening screw; 1011-bottom; 1012-thin-walled cylinders; 1051-cylindrical boss; 1052-round table; 201-a water tank; 202-plunger pump; 203-overflow valve; 204-pressure gauge; 205-high pressure pipe; 206-a test station; 207-a nozzle; 208-a measuring head; 209-charge amplifier; 210-data acquisition transport card; 211-upper computer
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
Referring to fig. 1, the impact jet pressure vibration composite measuring device comprises an impact jet generating device, a measuring head 208, a charge amplifier 209, a data acquisition and transmission card 210 and an upper computer 211.
The impingement jet generating device comprises: the water tank 201 is connected with the plunger pump 202 and the overflow valve 203 through water pipes; the plunger pump 202, the plunger pump 202 pumps the water in the water tank 201 into the high-pressure pipe 205, the rated working pressure of the plunger pump 202 is 40 Mpa; the overflow valve 203 is used for communicating the outlet of the plunger pump 202 with the water tank 201 and regulating the pressure of the plunger pump 202; a pressure gauge 204, wherein the pressure gauge 204 is arranged between the plunger pump 202 and the nozzle 207 and is used for measuring the inlet pressure of the nozzle 207; the high-pressure pipe 205, the high-pressure pipe 205 is inserted into the test bench 206, the top of the high-pressure pipe 205 connects the spray nozzle 207 through the screw thread fit; the test bench 206, the test bench 206 is used for installing the high-pressure pipe 205, the nozzle 207 and the measuring head 208; a nozzle 207, the nozzle 207 being mounted on the test bench 206, generating a pulsed jet by the self-oscillation principle.
As shown in fig. 2-3, the probe 208 includes: a housing 101; a waterproof ring 102; an elastic diaphragm 103; a thin film piezoelectric sensor 104; an inner case 105; a fastening screw 106; the shell 101 comprises a bottom 1011 and a thin-wall cylinder 1012, wherein the bottom 1011 is provided with a round hole, and the thin-wall cylinder 1012 and the bottom 1011 are integrally formed; the inner shell 105 comprises a cylindrical boss 1051 and a circular truncated cone 1052, and the cylindrical boss 1051 and the circular truncated cone 1052 are integrally formed; the cylindrical boss 1051 is inserted into the thin-wall cylinder 1012 to form clearance fit, and the bottom 1011 limits the cylindrical boss 1051; the fastening screw 106 penetrates through the thin-wall cylinder 1012 and the circular truncated cone 1052, and the outer shell 101 and the inner shell 105 are connected by screwing the fastening screw 106; the thin film piezoelectric sensor 104 includes a PVDF thin film, an upper electrode, a lower electrode, an upper insulation sheet, a lower insulation sheet, and a lead, the PVDF thin film generates polarization phenomenon after being pressed, and generates charge information, and the charge information is transmitted to the charge amplifier 209 along the lead through the upper electrode and the lower electrode.
The elastic diaphragm 103 and the thin film piezoelectric sensor 104 are both circular, and the diameter of the elastic diaphragm 103 is the same as the inner diameter of the thin-walled cylinder 1012; a round hole formed in the bottom 1011 is positioned in the center of the bottom 1011; the center of the elastic diaphragm 103 is aligned with the center of the circular hole in the bottom 1011 and the impinging jet can impinge directly on the elastic diaphragm 103 through the circular hole in the bottom 1011.
The position of the nozzle 207 is fixed, the gauge head 208 is mounted on the test bed 206, the center of the gauge head 208 is aligned with the center of the outlet of the nozzle 207, the test bed 206 is provided with a slide rail, and the gauge head 208 can freely move on the slide rail along the axial direction of the jet beam to adjust the distance between the nozzle 207 and the gauge head 208.
The measuring head 208 is arranged on the test bench 206, and the measuring head 208 generates a charge signal after being impacted by the pulse jet; the charge amplifier 209 receives the charge signal generated by the probe 208 and converts the charge signal into a voltage signal and linearly amplifies the voltage signal by 1 to 100 times.
The depth of the circular groove is one half of the thickness of the waterproof ring 102 and is used for limiting the position of the waterproof ring 102, the waterproof ring 102 is made of rubber, the elastic membrane 103 presses the waterproof ring 102 on the bottom 1011 under the extrusion of the inner shell 105, so that the waterproof ring 102 seals the round hole of the bottom 1011 and prevents jet flow from penetrating into the measuring head 208.
When the elastic diaphragm 103 presses the waterproof ring 102, the waterproof ring 102 also provides a reaction force to the elastic diaphragm 103 to press the elastic diaphragm 103 and the thin-film piezoelectric sensor 104 together, so that uneven contact between the elastic diaphragm 103 and the thin-film piezoelectric sensor 104 due to dimensional deviation of parts of the measuring head 208 or abrasion of parts of the measuring head 208 after the measuring head 208 is used for a period of time is prevented, and the elastic diaphragm 103 can transmit impact jet pressure to the thin-film piezoelectric sensor 104 more accurately.
The top end and the side surface of the cylindrical boss 1051 are provided with wire grooves, the center of the thin film piezoelectric sensor 104 is aligned with the center of the elastic diaphragm 103, and the wires of the thin film piezoelectric sensor 104 are placed in the wire grooves.
The elastic diaphragm 103 is made of elastic steel, the thickness of the elastic steel is between 0.1 millimeter and 2 millimeters, and different thicknesses are selected according to different working pressures of the impact jet flow; the elastic diaphragm 103 is wear-resistant, has high toughness and excellent fatigue resistance, can transmit jet impact pressure instantly and can keep working for a long time.
The impact jet flow has great erosion force on the impacted material under long-time impact, the elastic diaphragm 103 is arranged between the impact jet flow and the thin film piezoelectric sensor 104, the elastic diaphragm 103 receives the direct impact of the impact jet flow and then transmits the impact pressure to the thin film piezoelectric sensor 104, and the loss of the thin film piezoelectric sensor 104 can be reduced to the greatest extent; and the elastic diaphragm 103 is cheap and convenient to replace after being damaged.
The data acquisition transmission card 210 receives the voltage signal of the charge amplifier 209 and then wirelessly transmits the voltage signal.
The data acquisition module adopts the multichannel to gather voltage signal to be furnished with automatic gain scanning circuit, set up suitable gain value for the sampling channel in the sampling process, sampling frequency is high, and the acquisition volume is big, can gather 10 to 1000 data in 1 microsecond, guarantees that the impact jet pressure data of gathering is the instantaneous pressure value.
The wireless data transmitting module adopts a LoRa spread spectrum modulation technology, so that the signal penetrability is good, the power consumption is low, the data encryption is good, the transmission distance can reach 2-5 kilometers, and the real-time monitoring of impact jet is not limited by a field; a plurality of loRa nodes of a loRa gateway can be adopted to realize multi-point position monitoring.
The upper computer 211 receives a voltage signal of the wireless data acquisition transmission card 210, the LabView software automatically processes and transforms the collected pressure data to obtain pressure and vibration change data of the impact jet within a period of time, the pressure data is displayed on a monitoring interface of the LabView software of the upper computer 211 in a pressure oscillogram, and the vibration data is stored in the upper computer 211.
As shown in FIG. 4, the left side of the monitoring interface of LabView software is a hardware parameter area and a sampling setting area, the right side is a pressure threshold area, the upper and lower limits of pressure can be set, a lamp is turned on to warn when the threshold value is exceeded, the upper right side is a start and stop switch, and the lower side is a jet flow pressure waveform display area.
The impact jet flow pressure vibration composite measurement method comprises the following implementation steps:
(1) connecting an impact jet flow pressure vibration composite measuring device;
(2) mounting the measuring head 208 on the test bench 206, wherein the distance between the measuring head 208 and the nozzle 207 is between 20 mm and 50 mm, adjusting the position of the measuring head 208 to enable the center of the measuring head 208 to be aligned with the center of the nozzle opening of the nozzle 207, and fixing the position of the measuring head 208;
(3) connecting a power supply, starting an upper computer 211, starting LabView software, selecting acquisition card parameters and sampling parameters on a monitoring interface as shown in figure 4, and setting an upper threshold value and a lower threshold value of jet pressure;
(4) knocking the measuring head 208, and simultaneously adjusting the amplification factor of the charge amplifier 209 until the LabView software can see a pressure waveform, if the waveform is not obvious or has no waveform, adjusting the tightness degree of the fastening screw 106 on the measuring head 208, and repeatedly knocking the measuring head 208 until the LabView software can see the pressure waveform;
(5) opening the plunger pump 202, and adjusting the working pressure of the plunger pump 202 to 35-40 MPa;
(6) adjusting the amplification factor of the charge amplifier 209 to ensure that the size of a jet pressure oscillogram on LabView software is proper, and starting jet pressure vibration composite measurement;
(7) the jet flow impacts the measuring head 208, the measuring head 208 generates charge information, the charge information is amplified by the charge amplifier 209 and converted into voltage signals, the voltage signals are collected by the data collection and transmission card 210 and then transmitted to the upper computer 211, LabView software analyzes and processes the voltage signals, the voltage signals are converted into pressure signals and vibration signals with equal strength, and the pressure signals are displayed on a monitoring interface of the LabView software in a waveform diagram.
(8) After the jet pressure vibration composite measurement is finished, the plunger pump 202 is closed, jet pressure data and vibration data are stored in the upper computer 211, the upper computer 211 is closed, a power supply is disconnected, and the site is cleaned.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (9)
1. An impinging jet pressure vibration composite measuring device, comprising: the device comprises an impact jet flow generating device, a measuring head, a charge amplifier, a data acquisition and transmission card and an upper computer;
the impact jet flow generating device comprises a water tank, a plunger pump, an overflow valve, a pressure gauge, a high-pressure pipe, a test board and a nozzle; the impact jet flow generating device is used for generating impact jet flow;
the measuring head comprises an outer shell, a waterproof ring, an elastic diaphragm, a thin film piezoelectric sensor, an inner shell and a fastening screw rod; the shell comprises a thin-wall cylinder and a bottom, and a round hole is formed in the bottom; the inner shell comprises a circular truncated cone and a cylindrical boss; the cylindrical boss is inserted into the thin-wall cylinder to form clearance fit, and the bottom limits the cylindrical boss; the fastening screw penetrates through the thin-wall cylinder and the circular truncated cone and is used for fastening and connecting the outer shell and the inner shell; a circular groove is formed in one side, close to the cylindrical boss, of the bottom, and the waterproof ring is installed in the circular groove; the elastic membrane and the thin film piezoelectric sensor are positioned between the waterproof ring and the cylindrical boss, the elastic membrane is close to the waterproof ring, and the thin film piezoelectric sensor is close to the cylindrical boss; the measuring head is used for receiving the impact jet flow pressure and generating a charge signal, and measuring the instantaneous impact pressure of the impact jet flow and a jet flow vibration signal through the charge signal;
the charge amplifier can amplify and convert the charge signal generated by the measuring head into a voltage signal;
the data acquisition transmission card can acquire the voltage signal from the charge amplifier at a high speed and transmit the voltage signal out through a wireless signal;
the upper computer can receive the voltage signal of the data acquisition transmission card, the voltage signal is processed by software to obtain an impact jet pressure signal and a vibration signal, a jet pressure oscillogram within a period of time is displayed on a display screen of the upper computer, and the vibration signal is stored in the upper computer.
2. The impinging jet pressure vibration composite measuring device of claim 1, wherein the thin-walled cylinder is integrally formed with the bottom portion, and the circular truncated cone is integrally formed with the cylindrical boss.
3. The impinging jet pressure vibration composite measuring device of claim 1, wherein the elastic diaphragm and the thin film piezoelectric sensor are both circular, and the diameter of the elastic diaphragm is the same as the inner diameter of the thin-walled cylinder; the circular hole is positioned in the center of the bottom; the center of the elastic diaphragm is aligned with the center of the round hole at the bottom, and the impact jet can directly impact on the elastic diaphragm through the round hole at the bottom.
4. The impact jet pressure vibration composite measuring device according to claim 1, wherein the data acquisition transmission card comprises a data acquisition module and a wireless data transmitting module; the data acquisition module acquires data and transmits the data in real time through the wireless data transmitting module.
5. The impact jet pressure vibration composite measuring device as claimed in claim 1, wherein the upper computer is provided with a wireless data receiving module, the software is LabView, and the upper computer can receive and process data and display jet pressure information in real time.
6. The impinging jet pressure vibration composite measurement device of claim 1, wherein the elastic diaphragm material is spring steel and has a thickness of between 0.1 mm and 2 mm.
7. The impinging jet pressure vibration composite measuring device of claim 1, wherein the charge amplifier receives a charge signal generated by the thin film piezoelectric sensor, amplifies the charge signal and converts the amplified charge signal into a proportional voltage signal; the position of the nozzle is fixed, the measuring head is installed on a test bench, the center of the measuring head is aligned with the center of the outlet of the nozzle, a sliding rail is arranged at the bottom of the test bench, and the measuring head can freely move on the sliding rail along the axial direction of the jet beam so as to adjust the distance between the nozzle and the measuring head.
8. The impinging jet pressure vibration composite measuring device of any one of claims 1 and 4, wherein the data acquisition module acquires the voltage signal of the charge amplifier at a rate of 10 megahertz to 1000 megahertz; the wireless data transmitting module transmits data to the upper computer for analysis and processing based on the LoRa spread spectrum modulation technology.
9. A pressure vibration composite measuring method of an impact jet pressure vibration composite measuring device as claimed in any one of claims 1 to 8,
(1) connecting an impact jet flow pressure vibration composite measuring device;
(2) the measuring head is arranged on a test bench, the distance between the measuring head and the nozzle is 20 mm to 50 mm, the position of the measuring head is adjusted to enable the center of the measuring head to be aligned with the center of a nozzle opening of the nozzle, and the position of the measuring head is fixed;
(3) connecting a power supply, starting the upper computer, opening LabView software, selecting acquisition card parameters and sampling parameters on a monitoring interface of the LabView software, and setting an upper threshold value and a lower threshold value of jet pressure;
(4) knocking the measuring head, adjusting the amplification factor of the charge amplifier at the same time until a pressure waveform can be seen on LabView software, adjusting the tightness degree of the fastening screw if the waveform is not obvious or has no waveform, and repeatedly knocking the measuring head until the pressure waveform can be displayed on the LabView software;
(5) opening the plunger pump, and adjusting the working pressure of the plunger pump to 35-40 MPa;
(6) adjusting the amplification factor of the charge amplifier to ensure that the size of a jet pressure oscillogram on LabView software is proper, and starting jet pressure vibration composite measurement;
(7) the jet flow impacts the measuring head, the measuring head generates charge information, the charge information is amplified by the charge amplifier and converted into voltage signals, the voltage signals are collected by the data collection and transmission card and then transmitted to the upper computer, LabView software analyzes and processes the voltage signals, the voltage signals are converted into pressure signals and vibration signals with equal strength, and the pressure signals are displayed on a monitoring interface of the LabView software in a waveform diagram.
(8) And after the jet pressure vibration composite measurement is finished, closing the plunger pump, storing jet pressure data and vibration data in an upper computer, closing the upper computer, and disconnecting the power supply.
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| CN115711694A (en) * | 2022-11-15 | 2023-02-24 | 中国人民解放军火箭军工程大学 | Method and device for measuring surface cavitation impact load of solid propellant in cavitation field |
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