CN109959478B - Pressure sensor rotating centrifugal force characteristic test system - Google Patents
Pressure sensor rotating centrifugal force characteristic test system Download PDFInfo
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- CN109959478B CN109959478B CN201811590226.6A CN201811590226A CN109959478B CN 109959478 B CN109959478 B CN 109959478B CN 201811590226 A CN201811590226 A CN 201811590226A CN 109959478 B CN109959478 B CN 109959478B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure
- G01L27/002—Calibrating, i.e. establishing true relation between transducer output value and value to be measured, zeroing, linearising or span error determination
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0061—Force sensors associated with industrial machines or actuators
- G01L5/0066—Calibration arrangements
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Abstract
The invention discloses a pressure sensor rotating centrifugal force characteristic test system, which comprises a data acquisition display system, a pressure sensor rotating test rack and a hydraulic adjusting system, wherein the data acquisition display system is connected with the data acquisition display system through a hydraulic control system; the pressure sensor rotation test bench adopts a form of calibrating a sensor in a rotation state by static pressure at an equal height position in a U-shaped oil duct, one end of the U-shaped oil duct is provided with a measured pressure sensor, the other end of the U-shaped oil duct is provided with a standard pressure sensor, the U-shaped oil duct is communicated with a measured oil cavity, the standard pressure sensor is fixed, and the output pressure value is used as the standard pressure of the oil duct; the pressure sensor to be measured and the U-shaped oil duct rotate synchronously, and the pressure value is output as an indicating value; the hydraulic adjusting system supplies oil to a tested oil cavity in the pressure sensor rotation test rack, so that the pressure, the temperature and the flow of oil in the tested oil cavity are accurately controlled, the data acquisition system realizes the real-time test of the pressure, the temperature and the flow of the oil in the tested oil cavity, and a feedback signal can be provided for the hydraulic adjusting system.
Description
Technical Field
The invention relates to the technical field of pressure sensor testing and measurement, in particular to a system for testing centrifugal force characteristics of a pressure sensor.
Background
The speed change mechanism of the high-power comprehensive transmission device usually adopts a wet multi-plate clutch, and the main working structures of the multi-plate clutch are a friction pair and a pressure oil cylinder. The pressure data of the pressure oil cylinder is a key parameter for the performance matching calculation of the transmission system. The clutch combination pressure is provided by a pressure oil cylinder, is used as a key parameter for designing a gear shifting time sequence and gear shifting characteristics, and is a key boundary condition of simulation calculation. The combination pressure is constantly changed in the clutch combination process, an oil pressure buffer characteristic is presented, and the gear shifting performance is influenced by influencing key parameters such as combination time, transmission torque, instantaneous temperature rise and the like. To improve overall performance, it is desirable to improve the overall transmission maneuverability and power density. In order to improve the mobility of the transmission device, the gear shifting relative speed and load need to be improved, so that the pressure is required to be increased, the friction heat is increased, the gear shifting impact is increased, and the gear shifting smoothness is reduced. The increase in power density of the transmission requires a reduction in the size of the structure, which leads to a reduction in the thermal capacity of the system and a reduction in reliability. The contradiction can be solved only by acquiring pressure data of the pressure oil cylinder, designing the oil pressure buffer characteristic, matching various performances of the transmission system and acquiring higher gear shifting smoothness, acceleration and reliability. Obtaining high precision pressure data of the pressure oil cylinder requires directly obtaining pressure at the pressure oil cylinder.
In order to obtain pressure data of the pressure oil cylinder, only a pressure sensor can be arranged in the pressure oil cylinder, and voltage signals output by the pressure sensor in the pressure oil cylinder in the working process of the clutch are collected and stored, and are converted into pressure physical quantities by combining with calibration characteristic parameters of the sensor. The clutch is in a high-speed rotation state in the transmission device, and a pressure sensor installed in the clutch is also in a high-speed rotation state. The pressure sensor head is subjected to a centrifugal force field in a high-speed rotating field, and the effect is reflected by outputting an additional electric signal. The additional electrical signal is superimposed with the normal fluid pressure signal and cannot be separated, so that the error of the pressure test data is increased. In order to improve the testing precision, an additional electric signal caused by centrifugal force needs to be tested, and the additional electric signal is separated through data processing, so that the testing precision of the pressure in the rotating field is improved.
Disclosure of Invention
In view of this, the invention provides a pressure sensor rotating centrifugal force characteristic test system, which can realize measurement of the pressure in the rotating oil liquid and obtain the influence characteristic of the centrifugal force on the pressure sensor in the rotating state.
A pressure sensor rotation centrifugal force characteristic test system comprises a data acquisition display system, a pressure sensor rotation test rack and a hydraulic adjusting system;
the pressure sensor rotary test bench adopts a sensor form under a static pressure calibration rotation state at an equal height position in a U-shaped oil duct, one end of the U-shaped oil duct is provided with a measured pressure sensor, the other end of the U-shaped oil duct is provided with a standard pressure sensor, the U-shaped oil duct is communicated with a measured oil cavity, the standard pressure sensor is fixed, and the output pressure value is used as the standard pressure of the oil duct; the pressure sensor to be measured and the U-shaped oil duct rotate synchronously, and the pressure value is output as an indicating value; the hydraulic adjusting system supplies oil to a tested oil cavity in the pressure sensor rotation testing rack, so that the pressure, the temperature and the flow of oil in the tested oil cavity are accurately controlled, the data acquisition system is used for testing the pressure, the temperature and the flow of the oil in the tested oil cavity in real time, and a feedback signal can be provided for the hydraulic adjusting system.
Further, the pressure sensor rotation test bench comprises a power motor, a standard pressure rotation support seat, an oil inlet and outlet rotation support seat, a bearing and a rotation inner shaft;
a plurality of independent U-shaped oil ducts are processed on the rotating inner shaft, the pressure testing points are connected with two sensors on a standard pressure point through the U-shaped oil ducts, a pair of oil ducts are used as an outlet and an inlet of oil, and other oil ducts are used as the pressure testing points;
sensor mounting interfaces are uniformly distributed on the cylinder of the standard pressure rotary supporting seat along the axial direction, and grooves are machined in the positions of the sensor mounting interfaces along the circumference of the inner wall; the groove is a channel for communicating the oil passage of the rotating inner shaft with the sensor; the standard pressure rotary supporting seat is fixed, the rotary inner shaft rotates along the shaft center, no matter where the oil duct of the oil cavity to be measured rotates, the oil duct is always communicated with the sensor under the communication effect of the groove, and oil pressure can directly act on a sensitive head of the pressure sensor; the pressure value output by the pressure sensor is used as a standard pressure indicating value of the oil duct;
the standard pressure rotary supporting seat and the oil inlet and outlet rotary supporting seat form a sealed oil cavity to be measured after being butted, the inner rotary shaft is installed in an installation cavity formed by the standard pressure rotary supporting seat and the right base through a bearing, two ends of a U-shaped oil passage on the inner rotary shaft respectively correspond to the sensor installation interface and the oil cavity to be measured, and the power motor drives the inner rotary shaft to rotate relative to the standard pressure rotary supporting seat and the oil inlet and outlet rotary supporting seat.
Furthermore, when the liquid level of the U-shaped oil passage on one side of the rotating inner shaft is lower than that of the oil cavity to be measured, the liquid level of the two ends of the U-shaped oil passage is consistent by connecting an external oil pipe to the interface of the standard pressure rotating support seat.
Furthermore, the hydraulic adjusting system comprises an oil tank, an oil pump control motor set, a pressure control system, a temperature control system, a flow control system, an oil return system and an auxiliary system; the pressure control system forms closed-loop control by a proportional overflow valve and a pressure sensor and controls the pressure of liquid in the static oil cavity structure; the temperature control system forms closed-loop control by a heater, a cooler and a temperature sensor and is used for accurately controlling the temperature of liquid in the static oil cavity structure; the flow control system forms closed-loop control by stepless speed regulation of the variable frequency motor and the flowmeter, and realizes accurate control of the flow required by the test; the control oil pump motor set and the oil return system are controlled by the controller in a unified way, and oil is output and recovered, wherein the oil is needed by the control system; the lubricating unit of the auxiliary system provides lubricating oil required by the test bed, and the filter device ensures the cleanliness of the oil.
Has the advantages that:
1. the invention adopts the static pressure at the equal height position in the U-shaped pipe to calibrate the sensor at the other side in the rotating state, and the static pressure of the liquid at the equal height position (equal rotating radius) is equal when the U-shaped pipe in the flow field is in the rotating state, thereby avoiding the hidden troubles of high cost and unreliability brought by using a collecting ring or a wireless transmission device.
2. The invention obtains the relationship between the signal output value of the pressure sensor in the rotating state and the parameters such as the rotating radius, the rotating speed, the measured pressure, the measured medium temperature and the like through the rotating centrifugal force characteristic test of the pressure sensor, and is used for carrying out data compensation on the output value of the pressure sensor for carrying out the rotating pressure test, thereby achieving the purpose of improving the test precision.
Drawings
FIG. 1 is a schematic diagram of a centrifugal force characteristic testing system for a pressure sensor according to the present invention;
FIG. 2 is a schematic diagram of a pressure sensor rotary test bed according to the present invention;
FIG. 3 is a schematic view of the pressure pipe and pressure point of the oil cavity under test according to the present invention;
the device comprises a frequency converter 1, a data acquisition and display system 2, a hydraulic oil tank 3, a pressure sensor 4, a rotary test bench, a hydraulic adjusting system 5, a power motor 6, a motor connecting disc 7, a standard pressure rotary supporting seat 8, a connector 9, an oil pipe connector 10, an oil inlet and outlet rotary supporting seat 11, a top plate 12, a bearing 13, a tested oil cavity 14, a base 15, a groove 16, a rotary inner shaft 17, a radius R1 pressure point 18, a radius R2 pressure point 19, an oil outlet 20, a radius R3 pressure point 21 and an oil inlet 22.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
As shown in the attached figure 1, the invention provides a pressure sensor rotating centrifugal force characteristic test system which comprises a pressure sensor rotating test rack 4, a hydraulic adjusting system 5 and a data acquisition and display system 2, wherein a frequency converter 1 controls the rotating speed of a power motor 6 in the pressure sensor rotating test rack 4, and a hydraulic oil tank 3 supplies oil for the hydraulic adjusting system.
The pressure sensor rotary test bench 4 is arranged in a straight line shape, and an oil return pump set of the hydraulic adjusting system 5 is arranged close to the pressure sensor rotary test bench 4, so that connection and signal acquisition are facilitated.
As shown in fig. 2 and 3, the pressure sensor rotation test bench 4 comprises a power motor 6, a motor connecting disc 7, a standard pressure rotation support 8, an oil inlet and outlet rotation support seat 11, a top plate 12, a base 15, a bearing 13 and a rotation inner shaft 17;
the motor connecting disc 7 connects the power motor 6 with the rotating inner shaft 17 together, the standard pressure rotating support 8, the oil inlet and outlet rotating support seat 11 and the base 15 form a test base, and the test base plays a role in supporting and fixing the pressure sensor rotating test rack 4.
Two oil pipe interfaces 10 are designed on the oil inlet and outlet rotary supporting seat 11, and the oil pipe interfaces 10 are connected with a hydraulic adjusting system through pressure pipes, so that the oil supply function is realized.
A plurality of interfaces 9 are designed on the standard pressure rotary supporting seat 8, and grooves are processed at the positions of the interfaces 9 along the circumference of the inner wall; the groove is a channel for communicating the oil passage of the rotating inner shaft with the sensor; the standard pressure rotary supporting seat 8 is fixed, the rotary inner shaft 17 rotates along the shaft center, no matter where the oil duct of the oil cavity to be measured rotates, the oil duct is always communicated with the sensor under the communication effect of the groove, and oil pressure can directly act on a sensitive head of the pressure sensor; the pressure value output by the pressure sensor is used as a standard pressure indicating value of the oil passage. The interface 9 is connected with a standard pressure sensor through a pressure guiding pipe.
The rotating inner shaft 17 is used as one of core components of a pressure sensor rotating test bench and is designed into a solid cylinder, two sides of the cylinder are supported by a pair of bearings 13, a plurality of independent U-shaped oil passages are processed on the rotating inner shaft 17, the pressure test points are connected with two sensors on a standard pressure point through the U-shaped oil passages, a pair of oil passages are used as an oil outlet 20 and an oil inlet 22 of oil, and other oil passages are used as pressure test points; the top plate 12 can fix the axial movement of the oil inlet and outlet rotary support seat 11 and the rotated inner shaft 17, and can plug one end of an oil passage to prevent oil leakage.
The core components of the pressure sensor rotary test bench are a tested oil cavity, a rotary inner shaft, an oil inlet and outlet rotary support and a standard pressure rotary support. The four parts are combined to realize the extraction of the pressure in the sealed oil cavity to be measured. The pressure pipe in the tested oil cavity 14 is communicated with the oil pipe in the rotating inner shaft 17 to form a U-shaped pipe, and the liquid level pressures at the two ends of the U-shaped pipe are the same. The pressure sensor is arranged at the position of the interface 9 at the end part of the 17 oil channel, so that the pressure value of the end part of the oil channel in the measured oil cavity 14 can be measured. The pressure value of the end of the oil pipe in the measured oil cavity 14 is used as a standard pressure point to calibrate a sensor arranged at the end of the oil passage of the rotating inner shaft 17. 3 pressure measuring points with different diameters are designed in the oil cavity 14 to be measured, namely a radius R1 pressure point 18, a radius R2 pressure point 19 and a radius R3 pressure point 21, wherein the radius R3 pressure point 21 is positioned in an oil passage on the rotating inner shaft 17, and the diameter of the radius R1 pressure point 18 is larger than the outer diameter of the rotating inner shaft 17, so that a pressure pipe is butted on the oil passage on one side of the oil cavity to be measured in the rotating inner shaft, a pressure sensor to be measured is installed in the pressure pipe, the diameter of the rotating inner shaft 17 is insufficient, and the pressure sensor can be connected with an external oil pipe through a connector 9, so that the liquid levels at two ends of the U-shaped oil passage. The test of three sensors and three radial rotating centrifugal force characteristics can be realized at one time. The test procedure was as follows:
(a) before the test, the rotating diameter is processed in 14 oil cavities to be tested according to the test requirements.
(b) And installing the pressure sensor to be tested at the corresponding measuring point position, connecting a sensor cable, debugging a test system and a pressure sensor centrifugal force characteristic test device, and preparing for a test.
(c) Setting a test temperature according to test requirements, displaying a temperature value by a lubricating oil temperature sensor for testing, and indicating that the test temperature is stable when the temperature value floats in a region with the preset temperature value of +/-2 ℃.
(d) And adjusting the pressure sensor to rotate the test bench to output oil pressure, so that the oil pressure in the tested oil cavity is stabilized to float within the range of +/-2% FS of a preset pressure value, and the test pressure is stable.
(e) And adjusting the output rotating speed of the pressure sensor rotating test bench to enable the rotating speed to be sequentially output according to a preset value. And when the rotating speed floats in the +/-2 r/min area, the rotating speed is stable, and the relevant data of the test is recorded. Until the test at each rotation speed point is finished.
(f) Repeating steps (e) (f) until all pressure points complete the cycle test.
(g) Repeating steps (c) (e) (f) until all temperature points have completed the cycling test.
(h) If it is desired to replace the sensors or rotate the diameter, repeating steps (b) (c) (e) (f) until all sensors have completed the cycle test at the predetermined diameter.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A pressure sensor rotation centrifugal force characteristic test system is characterized by comprising a data acquisition and display system, a pressure sensor rotation test rack and a hydraulic adjusting system;
the pressure sensor rotary test bench is in a form of a pressure sensor under a static pressure calibration rotating state at an equal height position in a U-shaped oil duct, one end of the U-shaped oil duct is provided with a tested pressure sensor, the other end of the U-shaped oil duct is provided with a standard pressure sensor, the U-shaped oil duct is communicated with a tested oil cavity, the standard pressure sensor is fixed, and an output pressure value is used as the standard pressure of the U-shaped oil duct; the pressure sensor to be measured and the U-shaped oil duct rotate synchronously, and the pressure value is output as an indicating value; the hydraulic adjusting system supplies oil to a tested oil cavity in the pressure sensor rotating test rack, so that the pressure, the temperature and the flow of oil in the tested oil cavity are accurately controlled, the data acquisition system realizes the real-time test of the pressure, the temperature and the flow of the oil in the tested oil cavity, and can also provide feedback signals for the hydraulic adjusting system;
the pressure sensor rotation test bench comprises a power motor, a standard pressure rotation support seat, an oil inlet and outlet rotation support seat, a bearing and a rotation inner shaft;
a plurality of independent U-shaped oil passages are processed on the rotating inner shaft, the U-shaped oil passages connect the pressure test points with two pressure sensors on a standard pressure point, one pair of the U-shaped oil passages are used as an outlet and an inlet of oil, and other U-shaped oil passages are used as pressure test points;
the cylinder of the standard pressure rotary supporting seat is uniformly distributed with pressure sensor mounting interfaces along the axial direction, and grooves are processed on the positions of the pressure sensor mounting interfaces along the circumference of the inner wall; the groove is a channel for communicating the U-shaped oil passage on the rotating inner shaft with the pressure sensor; the standard pressure rotary supporting seat is fixed, the rotary inner shaft rotates along the shaft center, no matter where the oil duct of the oil cavity to be measured rotates, the U-shaped oil duct is always communicated with the pressure sensor under the communication effect of the groove, and oil pressure can directly act on a sensitive head of the pressure sensor; the pressure value output by the pressure sensor is used as a standard pressure indicating value of the U-shaped oil passage;
the standard pressure rotary supporting seat and the oil inlet and outlet rotary supporting seat form a sealed oil cavity to be measured after being butted, the inner rotary shaft is installed in an installation cavity formed by the standard pressure rotary supporting seat and the right base through a bearing, two ends of a U-shaped oil passage on the inner rotary shaft respectively correspond to the pressure sensor installation interface and the oil cavity to be measured, and the power motor drives the inner rotary shaft to rotate relative to the standard pressure rotary supporting seat and the oil inlet and outlet rotary supporting seat.
2. The system for testing the rotating centrifugal force characteristics of the pressure sensor according to claim 1, wherein when the liquid level of the U-shaped oil passage on the side of the rotating inner shaft is lower than the liquid level of the side of the measured oil cavity, the liquid level of the two ends of the U-shaped oil passage is made to be the same by connecting an external oil pipe to the interface of the standard pressure rotating support base.
3. The system for testing the rotating centrifugal force characteristics of the pressure sensor according to claim 2, wherein the hydraulic adjusting system comprises an oil tank, a control oil pump motor set, a pressure control system, a temperature control system, a flow control system, an oil return system and an auxiliary system; the pressure control system forms closed-loop control by a proportional overflow valve and a pressure sensor and controls the pressure of liquid in the static oil cavity structure; the temperature control system forms closed-loop control by a heater, a cooler and a temperature sensor and is used for accurately controlling the temperature of liquid in the static oil cavity structure; the flow control system forms closed-loop control by stepless speed regulation of the variable frequency motor and the flowmeter, and realizes accurate control of the flow required by the test; the control oil pump motor set and the oil return system are controlled by the controller in a unified way, and oil is output and recovered, wherein the oil is needed by the control system; the lubricating unit of the auxiliary system provides lubricating oil required by the test bed, and the filter device ensures the cleanliness of the oil.
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| CN111828437B (en) * | 2020-06-19 | 2022-10-28 | 中国北方车辆研究所 | Clutch centrifugal oil pressure testing device capable of adjusting axial space |
| CN112945458B (en) * | 2021-02-02 | 2022-05-20 | 同济大学 | Automatic test system, method and device for pressure gauge |
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