CN113820111A - Damper locking sensitivity test method - Google Patents
Damper locking sensitivity test method Download PDFInfo
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- CN113820111A CN113820111A CN202111085131.0A CN202111085131A CN113820111A CN 113820111 A CN113820111 A CN 113820111A CN 202111085131 A CN202111085131 A CN 202111085131A CN 113820111 A CN113820111 A CN 113820111A
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- 230000035945 sensitivity Effects 0.000 title claims abstract description 11
- 238000010998 test method Methods 0.000 title claims description 12
- 238000012360 testing method Methods 0.000 claims abstract description 74
- 238000006073 displacement reaction Methods 0.000 claims abstract description 18
- 230000003068 static effect Effects 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 abstract description 8
- 230000000052 comparative effect Effects 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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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
- G01M13/00—Testing of machine parts
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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
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/025—Measuring arrangements
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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
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/06—Multidirectional test stands
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Abstract
The invention belongs to the technical field of testing of hydraulic dampers, and relates to a method for testing the locking sensitivity of a damper, which comprises the following steps: s1, mounting the damper test piece on a static test bench; s2, testing the locking speed and the speed after locking; s3, dynamic testing; s4, testing the static rigidity of the damper by small amplitude vibration, recording a load-time curve and a displacement-time curve, and deriving original data of the load, the displacement, the time and the speed; and S5, testing the dynamic stiffness of the damper in small vibration, recording a load-displacement curve, and outputting original data of load, displacement and time. The minimum clearance for locking the damper can be determined, the minimum clearance limit value is set according to the requirement of pipeline operation vibration control, and a foundation and guidance are provided for pipeline vibration control design, so that possible risks in the process of nuclear power engineering debugging are eliminated.
Description
Technical Field
The invention relates to the technical field of testing of hydraulic dampers, in particular to a method for testing the locking sensitivity of a damper.
Background
The problem of the pipeline vibration of the nuclear power station occurs occasionally, and particularly, the problem of the pipeline vibration is more concerned with the application of high-strength light materials such as high-strength cast iron, alloy steel and the like. The broadband excitation of fluid generated by the fluid vortex at the connecting pipe of one branch pipe is coupled with the acoustic mode of the pipeline, and the frequency of the broadband excitation is superposed with the natural frequency of the pipeline to generate resonance, so that the vibration is out of limit. The adjustment of the natural frequency of the pipeline is one of the main methods for effectively avoiding resonance and reducing vibration, but two dampers are arranged in the pipeline, and whether the dampers are locked or not under small vibration can have a crucial influence on the natural frequency of the pipeline. Therefore, the damper needs to be tested for latch-up sensitivity under small vibration before being placed in the pipe, to determine the minimum clearance for latching up of the damper, and to set a limit value for this minimum clearance according to the requirements of the pipe for operational vibration control.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to solve the problem of how to test the damper locking sensitivity under small amplitude vibration, the invention provides a damper locking sensitivity test method, which can determine the minimum clearance of damper locking, set the minimum clearance limit value according to the requirement of pipeline operation vibration control, provide basis and guidance for pipeline vibration control design, and eliminate the possible risk in the nuclear power engineering debugging process.
The invention provides a method for testing the locking sensitivity of a damper, which comprises the following steps:
s1, mounting the damper test piece on a static test bench;
s2, testing the locking speed and the speed after locking, namely applying speed to the damper test piece in the pulling and pressing directions, wherein the speed is not more than 400mm/min, and testing the locking speed and the speed after locking to the damper test piece in the pulling and pressing directions;
s3, dynamic testing, namely applying alternating load to the damper test piece, recording a load-displacement curve when the load is not more than 500kN, and enabling the amplitude to be not more than 6 mm;
s4, dismounting the damper test pieces, sequentially mounting all the damper test pieces on a static test bed, pulling and pressing the damper until the damper is locked, wherein the application speed range is 3-9 mm/S, recording a load-time curve and a displacement-time curve, and deriving original data of load, displacement, time and speed;
and S5, testing the dynamic stiffness of the damper by small amplitude vibration, sequentially mounting all damper test pieces on a dynamic test bed, setting the frequencies to be 5Hz, 10Hz, 15Hz, 20Hz and 25Hz, gradually increasing the amplitude from 0.015mm at each frequency, recording a load-displacement curve when the load is suddenly changed, and outputting original data of the load, the displacement and the time.
Specifically, in S2, the damper test piece is moved at a low speed, and then the moving speed is gradually increased.
Specifically, when the movement speed of the damper is 120-360 mm/min, the damper test piece needs to be locked.
Specifically, the test frequency in S3 is 1Hz, and the duration is not less than 10S; dynamic state
Specifically, the damper is pulled and pressed at the application speed of S4 of 3mm/S, 6mm/S, or 9 mm/S.
Specifically, the amplitude at each frequency in S5 needs to be less than 0.6 mm.
Specifically, when the amplitude is greater than 0.6mm at each frequency, the amplitude increases from 0.015mm to 0.1mm each time.
The invention has the beneficial effects that:
the method for testing the locking sensitivity of the damper can determine the minimum clearance of the damper locking, sets the limit value of the minimum clearance according to the requirement of pipeline operation vibration control, provides basis and guidance for pipeline vibration control design, and eliminates possible risks in the process of nuclear power engineering debugging.
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 diagram of a comparative testing apparatus,
FIG. 2 is a schematic diagram of a comparative testing apparatus;
reference numerals: the device comprises a butt joint seat 1, a portal frame 2, a vibration exciter 3, a displacement sensor 4, an acceleration sensor 5, a first pipeline tool 6 and a second pipeline tool 7.
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.
A damper lockout sensitivity test method comprises the following steps:
s1, mounting the damper test piece on a static test bench;
s2, testing the locking speed and the speed after locking, namely applying speed to the damper test piece in the pulling and pressing directions, wherein the speed is not more than 400mm/min, and testing the locking speed and the speed after locking to the damper test piece in the pulling and pressing directions; judging the quality of the damper test piece according to the locking speed and the locked speed;
s3, dynamic testing, namely applying an alternating load to the damper test piece, wherein the load is not more than 500kN, recording a load-displacement curve, and the amplitude is not more than 6 mm;
s4, testing the small-amplitude vibration static stiffness of the damper, dismounting the damper test pieces, sequentially mounting all the damper test pieces on a static test bench, pulling and pressing the damper until the damper is locked, recording a load-time curve and a displacement-time curve, and deriving load, displacement, time and speed original data, wherein the applied speed range is 3-9 mm/S; the data are utilized to enable the static rigidity of each time point before locking to be vertical, and then a static rigidity curve is drawn for analysis;
s5, testing the dynamic stiffness of the damper by small amplitude vibration, namely sequentially mounting all damper test pieces on a dynamic test bed, setting the frequencies to be 5Hz, 10Hz, 15Hz, 20Hz and 25Hz, gradually increasing the amplitude from 0.015mm at each frequency, recording a load-displacement curve when the load is suddenly changed, and outputting original data of the load, the displacement and the time; the stiffness at the corresponding amplitude is calculated.
Preferably, to verify reliability, the following comparative test may be employed:
as shown in fig. 1-2, the comparison testing device is composed of two abutting seats 1, a portal frame 2, a vibration exciter 3, a displacement sensor 4, an acceleration sensor 5, a first pipeline tool 6 and a second pipeline tool 7, wherein the abutting seats 1 are formed by vertically supporting 150 × 14 square steel pipes, vertically supporting 150 × 50 × 14 square steel pipes by 45 ° diagonal braces and welding and fixing 60 × 160 × 12 backing plates, the pipe diameter of the first pipeline tool 6 is Φ 32 × 3, the pipe diameter of the second pipeline tool 7 is Φ 114 × 4, and the lengths of the first pipeline tool 6 and the second pipeline tool 7 are both 2 m.
a. Damper is not installed in pipeline frock
One end of the pipeline tool is rigidly fixed on the abutting seat 1, the other end of the pipeline tool is connected with the vibration exciter 3, then vibration exciting amplitude is applied through the vibration exciter 3, and a displacement-time curve and an acceleration-time curve are recorded and recorded.
b. Damper for mounting pipeline tool
And after the step a is tested, adding a damper of a first type at the end part of the other end of the pipeline tool, then repeating the step a, then replacing the type of the damper added at the end part of the other end of the pipeline tool with a second type, and then repeating the step a. Wherein the excitation displacement requirement is always detected until the damper lock-up is detected.
In one embodiment, the damper test piece is moved at a low speed in S2, and then the moving speed is gradually increased.
In one specific embodiment, when the movement speed of the damper is 120-360 mm/min, the damper test piece must be locked; if the locking is not generated, the quality of the damper test piece is unqualified.
In one embodiment, the test frequency in S3 is 1Hz, and the duration is not less than 10S; the frequency of 1Hz is the optimum frequency for testing, and the time lasting within 10s is the optimum testing time point.
In one embodiment, the applying speed in S4 is 3mm/S, 6mm/S, 9mm/S for pulling and pressing the damper.
In one embodiment, the amplitude at each frequency of S5 is less than 0.6 mm.
In one embodiment, each increase in amplitude from 0.015mm to 0.1mm occurs at an amplitude greater than 0.6mm per frequency.
The above test method can be applied to the types of dampers in the following table.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. A damper lockout sensitivity test method is characterized by comprising the following steps:
s1, mounting the damper test piece on a static test bench;
s2, testing the locking speed and the speed after locking, namely applying the speed to the damper test piece in the pulling and pressing directions, wherein the speed is not more than 400mm/min, and testing the locking speed and the speed after locking to the damper test piece in the pulling and pressing directions;
s3, dynamic testing, namely applying an alternating load to the damper test piece, wherein the load is not more than 500kN, recording a load-displacement curve, and the amplitude is not more than 6 mm;
s4, testing the small-amplitude vibration static stiffness of the damper, dismounting the damper test pieces, sequentially mounting all the damper test pieces on a static test bench, pulling and pressing the damper until the damper is locked, recording a load-time curve and a displacement-time curve, and deriving load, displacement, time and speed original data, wherein the applied speed range is 3-9 mm/S;
and S5, testing the dynamic stiffness of the damper by small amplitude vibration, sequentially mounting all damper test pieces on a dynamic test bed, setting the frequencies to be 5Hz, 10Hz, 15Hz, 20Hz and 25Hz, gradually increasing the amplitude from 0.015mm at each frequency, recording a load-displacement curve when the load is suddenly changed, and outputting original data of the load, the displacement and the time.
2. The damper lock-out susceptibility test method of claim 1, wherein: in S2, the damper test piece is moved at a low speed, and then the moving speed is gradually increased.
3. The damper lock-out susceptibility test method of claim 2, wherein: when the movement speed of the damper is 120-360 mm/min, the damper test piece needs to be locked.
4. The damper lock-out susceptibility test method of claim 1, wherein: the test frequency in S3 is 1Hz, and the duration is not less than 10S.
5. The damper lock-out susceptibility test method of claim 1, wherein: the applying speed in S4 is 3mm/S, 6mm/S, 9mm/S for pulling and pressing the damper.
6. The damper lock-out susceptibility test method of claim 1, wherein: the amplitude at each frequency in S5 needs to be less than 0.6 mm.
7. The damper lock-out susceptibility test method of claim 6, wherein: at amplitudes greater than 0.6mm per frequency, each increase in amplitude goes from 0.015mm to 0.1 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111085131.0A CN113820111A (en) | 2021-09-16 | 2021-09-16 | Damper locking sensitivity test method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111085131.0A CN113820111A (en) | 2021-09-16 | 2021-09-16 | Damper locking sensitivity test method |
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| CN113820111A true CN113820111A (en) | 2021-12-21 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2651510Y (en) * | 2003-10-16 | 2004-10-27 | 上海理工大学附属工厂 | Hydraulic damper for large and medium sized apparatus in nuclear power station |
| CN104236893A (en) * | 2014-10-09 | 2014-12-24 | 河海大学常州校区 | Performance parameter test system and performance parameter test method of hydraulic damper |
| CN108645606A (en) * | 2018-05-11 | 2018-10-12 | 常州格林电力机械制造有限公司 | A kind of test method and equipment of large hydraulic damper |
| US20190203800A1 (en) * | 2016-09-16 | 2019-07-04 | Aisin Aw Industries Co., Ltd | Damper device |
| CN214092845U (en) * | 2020-12-08 | 2021-08-31 | 四川凌峰航空液压机械有限公司 | Equivalent damping ratio hydraulic damper |
-
2021
- 2021-09-16 CN CN202111085131.0A patent/CN113820111A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2651510Y (en) * | 2003-10-16 | 2004-10-27 | 上海理工大学附属工厂 | Hydraulic damper for large and medium sized apparatus in nuclear power station |
| CN104236893A (en) * | 2014-10-09 | 2014-12-24 | 河海大学常州校区 | Performance parameter test system and performance parameter test method of hydraulic damper |
| US20190203800A1 (en) * | 2016-09-16 | 2019-07-04 | Aisin Aw Industries Co., Ltd | Damper device |
| CN108645606A (en) * | 2018-05-11 | 2018-10-12 | 常州格林电力机械制造有限公司 | A kind of test method and equipment of large hydraulic damper |
| CN214092845U (en) * | 2020-12-08 | 2021-08-31 | 四川凌峰航空液压机械有限公司 | Equivalent damping ratio hydraulic damper |
Non-Patent Citations (1)
| Title |
|---|
| 关岭松: "核电厂850吨大型液压国产化研制", 中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑, no. 09, 15 September 2019 (2019-09-15), pages 39 - 75 * |
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