CN112284680A - Step force generator - Google Patents
Step force generator Download PDFInfo
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- CN112284680A CN112284680A CN202011234994.5A CN202011234994A CN112284680A CN 112284680 A CN112284680 A CN 112284680A CN 202011234994 A CN202011234994 A CN 202011234994A CN 112284680 A CN112284680 A CN 112284680A
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- pressure chamber
- gas
- pressure
- measuring system
- force value
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
- G01M9/062—Wind tunnel balances; Holding devices combined with measuring arrangements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L25/00—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency
-
- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a gas step force signal generator, relates to a positive and negative step force excitation source with a rapidly changing force value, and belongs to the technical field of tests. The device comprises an air source, a pressure control system, a first pressure chamber, an electromagnetic valve, a second pressure chamber, a piston rod, a loading head and a standard force value measuring system. The gas source is connected with the pressure control system, and the pressure control system adjusts the gas in the gas source to a set pressure value and fills the gas into the first pressure chamber; the first pressure chamber is connected with the second pressure chamber through an electromagnetic valve and is provided with pistons with the same diameter, and a piston rod is rigidly connected with the loading head through a standard force value measuring system; the first pressure chamber is much larger than the second pressure chamber. The invention can prolong the time of the step force value platform, better calibrate the low-frequency characteristic of the sensor, and can generate the change of positive and negative step forces.
Description
Technical Field
The invention relates to a step force signal generator, in particular to a positive and negative step force excitation source with a rapidly changing force value, and belongs to the technical field of tests.
Background
With the continuous development of scientific technology, the field of dynamic testing needs to be increased, for example, in the calibration of large test devices such as wind tunnel balances and the like, the step force generator is one of the most widely used force generators, and the step force generator can provide a stable and reliable step force signal for a platform to be tested in an experiment, so as to obtain a time domain index and a frequency response characteristic of the platform to be tested. At present, the related technology of the domestic step force signal generator is not mature, most products can only generate positive step force or negative step force independently, the positive step force and the negative step force cannot be generated, equipment is large and heavy, and the safety and the operation convenience of experimenters are challenged.
Disclosure of Invention
The invention aims to provide a step force signal generator which can provide a rapidly-changing positive step force excitation source and a rapidly-changing negative step force excitation source and generate large amplitude step force value changes. The invention can prolong the time of the step force value platform, better calibrate the low-frequency characteristic of the sensor, and can generate the change of the positive and negative step forces.
The purpose of the invention is realized by the following technical scheme.
The invention discloses a step force signal generator which comprises an air source, a pressure control system, a first pressure chamber, an electromagnetic valve, a second pressure chamber, a piston rod, a loading head and a standard force value measuring system.
The gas source is connected with the pressure control system, and the pressure control system adjusts the gas in the gas source to a set pressure value and fills the gas into the first pressure chamber; the first pressure chamber is connected with the second pressure chamber through an electromagnetic valve and is provided with pistons with the same diameter, and a piston rod is rigidly connected with the loading head through a standard force value measuring system; the first pressure chamber is much larger than the second pressure chamber.
The invention discloses a working method of a step force signal generator, which comprises the following steps: when a positive step force test is carried out, firstly, a small amount of preload pressure is filled in the second pressure chamber, the piston rod is ensured to be reliably connected with the standard force value measuring system and the loading head, the electromagnetic valve is closed, then gas with set pressure is filled in the first pressure chamber, the electromagnetic valve is quickly opened after the device is ensured to be in a closed environment, the gas in the first pressure chamber quickly flows into the second pressure chamber, and the piston generates a positive step force signal due to instant pressure change and acts on the standard force value measuring system and the loading head through the piston rod.
When a negative step force test is carried out, firstly, a large amount of preload pressure is filled in the second pressure chamber, the piston rod is ensured to be reliably connected with the standard force value measuring system and the loading head, the electromagnetic valve is closed, then, the gas in the first pressure chamber is exhausted, the electromagnetic valve is quickly opened after the device is ensured to be in a closed environment, the gas in the second pressure chamber quickly flows into the first pressure chamber, and the piston generates a negative step force signal due to instant pressure change and acts on the standard force value measuring system and the loading head through the piston rod.
Preferably, the medium adopts compressed air, the storage and the transportation are convenient, the air after the test is directly discharged into the atmosphere, the environment is not polluted, and the treatment is convenient; the air is adopted, and the problems of medium deterioration, pipeline corrosivity, supplement replacement and the like in long-time use are avoided; and the pneumatic reaction is fast, the action is rapid, the maintenance is simple, and the pipeline is not easy to block.
Advantageous effects
1. The step force signal generator disclosed by the invention can generate quick positive and negative step forces, the magnitude of the force amplitude is adjusted according to the area and the pressure value of the piston, and stepless adjustment in a measuring range can be guaranteed; on the premise of ensuring the sealing performance, the time of a force value signal platform generated by the invention can be infinitely long; and the method is convenient and simple to operate, pollution-free, high in durability and reliability and very suitable for calibration and simulation tests of a force value platform.
2. According to the step force signal generator disclosed by the invention, the medium adopts compressed air, the storage and the transportation are convenient, the air after the test can be directly discharged into the atmosphere, the environment is not polluted, and the processing is convenient; the air is adopted, and the problems of medium deterioration, pipeline corrosivity, supplement replacement and the like in long-time use are avoided; and the pneumatic reaction is fast, the action is rapid, the maintenance is simple, and the pipeline is not easy to block.
3. The step force signal generator disclosed by the invention is small in structure and simple to operate, foundation auxiliary facilities such as a foundation and the like do not need to be installed, an experiment operator can freely move the device, the use place and the environment of the device are changed, calibration and verification in a laboratory can be realized, and field test can be carried out in the field.
Drawings
Fig. 1 is a schematic structural diagram of a step force signal generator according to the present invention.
The device comprises a gas source 1, a pressure control system 2, a first pressure chamber 3, an electromagnetic valve 4, a second pressure chamber 5, a piston 6, a piston rod 7, a loading head 8 and a standard force value measuring system 9.
Detailed Description
For a better understanding of the objects and advantages of the present invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and examples.
Example 1:
as shown in fig. 1, the step force signal generator disclosed in this embodiment includes an air source 1, a pressure control system 2, a first pressure chamber 3, a solenoid valve 4, a second pressure chamber 5, a piston 6, a piston rod 7, a loading head 8, and a standard force value measuring system 9.
The step force generator mainly comprises an air source 1, a pressure control system 2, a first pressure chamber 3, an electromagnetic valve 4, a second pressure chamber 5, a piston 6, a piston rod 7, a loading head 8, a standard force value measuring system 9 and the like; the gas source 1 is connected with the pressure control system 2, and the pressure control system 2 adjusts the gas in the gas source 1 to a set pressure value and fills the gas into the first pressure chamber 3; the first pressure chamber 3 is connected with the second pressure chamber 5 through an electromagnetic valve 4 and is provided with a piston 6 with the outer diameter of 20mm, and a piston rod 7 is rigidly connected with a loading head 8 through a standard force value measuring system 9; the first pressure chamber 3 is much larger than the second pressure chamber 5.
The working method of the step force signal generator disclosed by the embodiment comprises the following steps: when a positive step force test is carried out, firstly, 0.1MPa of preload pressure is filled in the second pressure chamber 5, the piston rod 7 is ensured to be reliably connected with the standard force value measuring system 9 and the loading head 8, the electromagnetic valve 4 is closed, then 1MPa of gas is filled in the first pressure chamber 3, after the device is ensured to be in a closed environment, the electromagnetic valve 4 is quickly opened, the gas in the first pressure chamber 3 quickly flows into the second pressure chamber 5, and the piston 6 with the outer diameter of 20mm generates a 282N positive step force signal under the instant pressure change, and acts on the standard force value measuring system 9 and the loading head 8 through the piston rod 7.
When a negative step force test is carried out, firstly, 1MPa of preload pressure is filled in the second pressure chamber 5, the piston rod 7 is ensured to be reliably connected with the standard force value measuring system 9 and the loading head 8, the electromagnetic valve 4 is closed, then, the gas in the first pressure chamber 3 is exhausted, after the device is ensured to be in a closed environment, the electromagnetic valve 4 is quickly opened, the gas in the second pressure chamber 5 quickly flows into the first pressure chamber 3, and the piston 6 with the outer diameter of 20mm generates a 314N negative step force signal under the instant pressure change, and acts on the standard force value measuring system 9 and the loading head 8 through the piston rod 7. The characteristic indexes of the measured platform such as rise time, overshoot, establishment time, resonant frequency and the like can be obtained through analysis of the output of the standard force value measuring system.
The mechanical structure has very long service life and long-time continuous use capability, and the gas medium is used, so that the tested platform and the use environment cannot be damaged or polluted.
The above detailed description is intended to illustrate the objects, aspects and advantages of the present invention, and it should be understood that the above detailed description is only exemplary of the present invention and is not intended to limit the scope of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (4)
1. A step force signal generator, comprising: the device comprises an air source (1), a pressure control system (2), a first pressure chamber (3), an electromagnetic valve (4), a second pressure chamber (5), a piston (6), a piston rod (7), a loading head (8) and a standard force value measuring system (9);
the gas source (1) is connected with the pressure control system (2), and the pressure control system (2) adjusts the gas in the gas source (1) to a set pressure value and fills the gas into the first pressure chamber (3); the first pressure chamber (3) is connected with the second pressure chamber (5) through an electromagnetic valve (4) and is provided with a piston (6) with an outer diameter, and a piston rod (7) is rigidly connected with a loading head (8) through a standard force value measuring system (9); the first pressure chamber (3) is much larger than the second pressure chamber (5).
2. A step force signal generator according to claim 1, wherein: the working method comprises the steps that when a positive step force test is carried out, a small amount of preload pressure is filled in the second pressure chamber (5) firstly, the piston rod (7) is guaranteed to be reliably connected with the standard force value measuring system (9) and the loading head (8), the electromagnetic valve (4) is closed, then a large amount of gas is filled in the first pressure chamber (3), the electromagnetic valve (4) is quickly opened after the device is guaranteed to be in a closed environment, the gas in the first pressure chamber (3) quickly flows into the second pressure chamber (5), and the piston (6) generates a positive step force signal under the action of instant pressure change and acts on the standard force value measuring system (9) and the loading head (8) through the piston rod (7);
when a negative step force test is carried out, firstly, a large amount of preload pressure is filled in the second pressure chamber (5), the piston rod (7) is ensured to be reliably connected with the standard force value measuring system (9) and the loading head (8), the electromagnetic valve (4) is closed, then, the gas in the first pressure chamber (3) is exhausted, after the device is ensured to be in a closed environment, the electromagnetic valve (4) is quickly opened, the gas in the second pressure chamber (5) quickly flows into the first pressure chamber (3), the piston (6) generates a negative step force signal under the action of instant pressure change, and the negative step force signal acts on the standard force value measuring system (9) and the loading head (8) through the piston rod (7).
3. A step force signal generator according to claim 2, wherein: and obtaining characteristic indexes through the output analysis of the standard force value measuring system, wherein the characteristic indexes comprise the rise time, the overshoot, the establishing time and the resonant frequency of the measured platform.
4. A step force signal generator according to claim 2, wherein: compressed air is adopted as the medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011234994.5A CN112284680A (en) | 2020-11-08 | 2020-11-08 | Step force generator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011234994.5A CN112284680A (en) | 2020-11-08 | 2020-11-08 | Step force generator |
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| CN112284680A true CN112284680A (en) | 2021-01-29 |
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| CN202011234994.5A Pending CN112284680A (en) | 2020-11-08 | 2020-11-08 | Step force generator |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114199581A (en) * | 2021-11-23 | 2022-03-18 | 内蒙航天动力机械测试所 | Dynamic calibration force source device of solid attitude and orbit control engine |
| CN114235333A (en) * | 2021-11-22 | 2022-03-25 | 中国航空工业集团公司北京长城计量测试技术研究所 | Pneumatic type shock tube initiative rupture of membranes device |
| CN114754925A (en) * | 2022-01-27 | 2022-07-15 | 中国航空工业集团公司北京长城计量测试技术研究所 | Portable negative step pressure generator |
| CN117191330A (en) * | 2023-09-21 | 2023-12-08 | 中国空气动力研究与发展中心超高速空气动力研究所 | In-situ calibration method for pressure instrument of large combustion wind tunnel |
Citations (6)
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| US5187987A (en) * | 1991-11-19 | 1993-02-23 | The Pennsylvania Research Corporation | Bending beam creep test device with piston having a gas bearing |
| CN103712744A (en) * | 2014-01-10 | 2014-04-09 | 浙江大学 | Positive step force testing system |
| CN103730040A (en) * | 2014-01-10 | 2014-04-16 | 浙江大学 | Aircraft thrust simulation system |
| CN203643085U (en) * | 2014-01-10 | 2014-06-11 | 浙江大学 | Positive step force test system |
| CN106768626A (en) * | 2016-12-03 | 2017-05-31 | 中国航空工业集团公司北京长城计量测试技术研究所 | A kind of gas Step Pressure signal generator |
| CN109946020A (en) * | 2019-02-23 | 2019-06-28 | 山东大学 | A kind of test of rapidity pressure sensor dynamic and calibrating installation |
-
2020
- 2020-11-08 CN CN202011234994.5A patent/CN112284680A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5187987A (en) * | 1991-11-19 | 1993-02-23 | The Pennsylvania Research Corporation | Bending beam creep test device with piston having a gas bearing |
| CN103712744A (en) * | 2014-01-10 | 2014-04-09 | 浙江大学 | Positive step force testing system |
| CN103730040A (en) * | 2014-01-10 | 2014-04-16 | 浙江大学 | Aircraft thrust simulation system |
| CN203643085U (en) * | 2014-01-10 | 2014-06-11 | 浙江大学 | Positive step force test system |
| CN106768626A (en) * | 2016-12-03 | 2017-05-31 | 中国航空工业集团公司北京长城计量测试技术研究所 | A kind of gas Step Pressure signal generator |
| CN109946020A (en) * | 2019-02-23 | 2019-06-28 | 山东大学 | A kind of test of rapidity pressure sensor dynamic and calibrating installation |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114235333A (en) * | 2021-11-22 | 2022-03-25 | 中国航空工业集团公司北京长城计量测试技术研究所 | Pneumatic type shock tube initiative rupture of membranes device |
| CN114199581A (en) * | 2021-11-23 | 2022-03-18 | 内蒙航天动力机械测试所 | Dynamic calibration force source device of solid attitude and orbit control engine |
| CN114754925A (en) * | 2022-01-27 | 2022-07-15 | 中国航空工业集团公司北京长城计量测试技术研究所 | Portable negative step pressure generator |
| CN117191330A (en) * | 2023-09-21 | 2023-12-08 | 中国空气动力研究与发展中心超高速空气动力研究所 | In-situ calibration method for pressure instrument of large combustion wind tunnel |
| CN117191330B (en) * | 2023-09-21 | 2024-04-26 | 中国空气动力研究与发展中心超高速空气动力研究所 | In-situ calibration method for pressure instrument of large combustion wind tunnel |
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Application publication date: 20210129 |