CN102435525B - Loading force value calibrating method suitable for fatigue-testing machine and applied calibrating device - Google Patents
Loading force value calibrating method suitable for fatigue-testing machine and applied calibrating device Download PDFInfo
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- CN102435525B CN102435525B CN 201110397311 CN201110397311A CN102435525B CN 102435525 B CN102435525 B CN 102435525B CN 201110397311 CN201110397311 CN 201110397311 CN 201110397311 A CN201110397311 A CN 201110397311A CN 102435525 B CN102435525 B CN 102435525B
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Abstract
The invention discloses a loading force value calibrating device suitable for a fatigue-testing machine, and the loading force value calibrating device comprises an air cylinder (1) provided with a piston (2), a data acquisition system (3), a high-precision force sensor I (4), a force sensor (6) and a fixture (7) used for clamping samples (8). The calibrating device also comprises a high-precision force sensor II (5), the high-precision force sensor I (4), the high-precision force sensor II (5) and the force sensor (6) are sequentially fixed between the piston (2) and the fixture (7), and the high-precision force sensor I (4) and the high-precision force sensor II (5) are both connected with the data acquisition system (3) through signals. The invention also provides a loading force value calibrating method carried out by the calibrating device. In the calibrating method, an acceleration value a does not need to be obtained, and errors brought by inertia force in calibration can be eliminated indirectly so as to achieve the result of accurate calibration.
Description
Technical field
The present invention relates to a kind of scaling method and caliberating device used that is applicable to fatigue tester loading force value.
Background technology
The pneumatic type fatigue tester is machinery industry a kind of fatigue tester commonly used, and therefore it have wide range of applications have the characteristics such as simple in structure, easy to operate, that efficient is high, power consumption is low in various types of fatigue testers.
Pneumatic type fatigue tester structural principle realizes that by the air pressure of control cylinder 1 piston 2 moves back and forth as shown in Figure 1, and fixture 7 is along with piston 2 moves together, applies to being fixed on sample 8 on fixture 7 that circulation is drawn, pressure, thereby realizes torture test; Installing force sensor 6 between piston 2 and fixture 7, power sensor 6 are used for detecting and show the power value or cylinder air pressure is controlled.The size of loading force realizes by the pressure of adjusting cylinders 1, the simplest control method employing hand valve open loop control; The value that gathers according to power sensor 6 before torture test begins is the valve of adjusting cylinders 1 in advance, thus controlled loading power.Also can the adoption rate valve etc. controlled valve replace hand valve and realize closed-loop control, be about to the sampled value of power sensor 6 as the air pressure of feedback quantity control ratio valve regulation cylinder 1, thus the power of control action on sample 8.
When sample 8 was carried out torture test, the size that is carried in the power on sample 8 directly affected the fatigue lifetime of sample 8.Loading force is that quality testing department is to the key index of fatigue tester gauging calibration.
With reference to the power value scaling method of other testing machine such as Material Testing Machine, namely add again a high-precision sensor on the basis of the existing sensor of testing machine, the value of this high-precision sensor sampling is compared as the value of standard value and testing machine demonstration.Concrete mode is connected in series high-precision force sensor I4 as shown in Figure 2 between piston 2 and power sensor 6, high-precision force sensor I4 connects data acquisition system (DAS) 3, realizes force measurement.Different from fatigue tester is that the power that Material Testing Machine is demarcated is the power of fixing, and the fatigue tester demarcation is the power that changes, therefore adopt data acquisition system (DAS) 3 to gather the change procedure of power value, and the drafting sampling curve, thereby the high-precision digital-display table of replacement Material Testing Machine is realized collection and the demonstration of the power value of variation.It is feasible that but this method is demarcated for slow test power value, but can produce very large deviation when dynamic test.Because detected power is dynamic force, the high-precision force sensor I4 that fatigue tester connects in motion is motion together also, the quality of high-precision force sensor I4 can produce inertial force in motion process, this inertial force is relevant with sensor mass and acceleration.
In Fig. 2, the displayed value of power sensor 6 is F, and the displayed value of high-precision force sensor I4 is F
1, utilize F
1Remove to demarcate F, F
1With the pass of F be:
F＝F
1+ma+mg
Wherein m is the quality of high-precision force sensor I4, and g is acceleration of gravity, and a is acceleration of motion.When system calibrating, after connecting, high-precision force sensor I4 must at first to two sensors (being power sensor 6 and high-precision force sensor I4) zero clearing (i.e. peeling operation), therefore can think
F＝F
1+ma
When static, a=0, so F=F
1, and the power that loads at the fatigue tester timing signal is dynamic force, so F ≠ F
1, therefore adopt said method F
1Value directly demarcate F and have problems on scaling method.In the torture test process, acceleration magnitude and direction constantly change, and along with the raising of test frequency, accekeration alters a great deal, even a small quality m also can bring very large deviation into to demarcation.Directly removing in this way to demarcate the power sensor 6 of fatigue tester, is obviously to obtain accurate result.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of caliberating device and corresponding scaling method that is applicable to fatigue tester loading force value, adopt this scaling method need not obtain the value of acceleration a, can indirectly eliminate the error that timing signal is brought by inertial force, thereby reach the result of accurate calibration.
In order to solve the problems of the technologies described above, the invention provides a kind of caliberating device that is applicable to fatigue tester loading force value, comprise cylinder, data acquisition system (DAS), high-precision force sensor I, the power sensor with piston and the fixture that is used for the gripping sample, caliberating device also comprises high-precision force sensor II, fixedly mount successively high-precision force sensor I, high-precision force sensor II and power sensor between piston and fixture, high-precision force sensor I all is connected with the data acquisition system (DAS) signal with high-precision force sensor II.
As the improvement that is applicable to the caliberating device of fatigue tester loading force value of the present invention: high-precision force sensor I and high-precision force sensor II belong to identical high-precision force sensor.
The present invention also provides the loading force value scaling method that utilizes above-mentioned caliberating device to carry out simultaneously, comprises the following steps:
1), high-precision force sensor I and high-precision force sensor II carried out respectively zero clearing process, be defined as follows after zero clearing: the power of high-precision force sensor I sampling is defined as F
1, the power of high-precision force sensor II sampling is defined as F
2
2), begin to carry out torture test after, data acquisition system (DAS) is carried out synchronized sampling to high-precision force sensor I and high-precision force sensor II, with the F that samples
1With F
2Pass through F=2F
2-F
1Computing formula obtain F; Described F is the calibration value of power sensor.
The caliberating device that is applicable to fatigue tester loading force value of the present invention, connect two identical high-precision sensors (being high-precision force sensor I and high-precision force sensor II) between piston and power sensor, and the sampled value while access data acquisition system with above-mentioned two high-precision sensors, by data acquisition system (DAS), sampled value is carried out obtaining the power value after data are processed, with this power value, the value of fatigue tester sensor (being the power sensor) is demarcated.Concrete principle and invention thinking are as follows:
Because two identical high-precision force sensor I, high-precision force sensor II rigidly fix connection, high-precision force sensor I directly over high-precision force sensor II, and high-precision force sensor I and high-precision force sensor II between the two without relative motion.High-precision force sensor I is fixed on piston, and high-precision force sensor II rigidly fixes with the power sensor and is connected, and power sensor and fixture are fixedly linked.After above-mentioned annexation was completed, piston was in the state of not stressing, and namely air pressure equals atmospheric pressure, then to high-precision force sensor I and high-precision force sensor II zero clearing (i.e. peeling).After peeling, the power of high-precision force sensor I sampling is defined as F
1, the power of high-precision force sensor II sampling is defined as F
2, the quality of definition high-precision force sensor I is m
1, the quality of definition high-precision force sensor II is m
2, the acceleration of these two sensors of high-precision force sensor I and high-precision force sensor II when doing tiring exercises defines respectively a
1And a
2For owing to adopting two identical high-precision sensors, and adopt between the two and be rigidly connected, therefore can think that (annotate: the stiffness effect of sensor and web member itself can cause two relative motions between sensor, but this impact can be ignored to whole test, therefore can think between two sensors without relative motion):
m
1＝m
2＝m，
a
1＝a
2＝a，
Wherein m is the quality of single high-precision sensor, the accekeration when a is torture test.
The pass of the value of two high-precision sensor samplings is:
F
2＝F
1+ma，
Definition Δ F:
ΔF＝F
2-F
1＝ma
Be carried in value F and F on the power sensor
2The pass be:
F＝F
2+ma
Therefore can get:
F＝F
2+ΔF＝2×F
2-F
1
Data acquisition system (DAS) realizes high-precision force sensor I and high-precision force sensor II are carried out the high-speed, high precision synchronized sampling, with the F that samples
1With F
2By the value F that above-mentioned computing obtains, draw power value curve, this curve directly demonstrates waveform and the numerical values recited of the power of loading, by this curve, the power sensor is demarcated.
The scaling method that is applicable to fatigue tester loading force value of the present invention, due to all irrelevant with the quality of high-precision force sensor and acceleration of motion, therefore how changing of accekeration no matter, all can not exert an influence to the calibration value of power sensor; So, adopt the calibration value of the power sensor of the inventive method gained to have calibration result characteristics accurately.
Description of drawings
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Fig. 1 is the structure principle chart of existing pneumatic type fatigue tester;
Fig. 2 is the existing structural representation that is applicable to the caliberating device of fatigue tester loading force value;
Fig. 3 is the structural representation that is applicable to the caliberating device of fatigue tester loading force value of the present invention.
Embodiment
Fixedly mount successively high-precision force sensor I4, high-precision force sensor II5 and power sensor 6 between piston 2 and fixture 7, high-precision force sensor I4 directly over high-precision force sensor II5, and high-precision force sensor I4 and high-precision force sensor II5 between the two without relative motion.Be specially: piston 2 is fixedly linked with high-precision force sensor I4, and high-precision force sensor I4 be connected connection with high-precision force sensor II5, and high-precision force sensor II5 and power sensor 6 are fixedly linked, and power sensor 6 is fixedly linked with fixture 7.High-precision force sensor I4, high-precision force sensor II5 all are connected with data acquisition system (DAS) 3 signals.
The loading force value scaling method that utilizes above-mentioned caliberating device to carry out, carry out following steps successively:
1), high-precision force sensor I4 and high-precision force sensor II5 carried out respectively zero clearing process (peeling), be defined as follows after zero clearing: the power that high-precision force sensor I4 samples is defined as F
1, high-precision force sensor II5 sampling power be defined as F
2
2), begin to carry out torture test after, 3 couples of high-precision force sensor I4 of data acquisition system (DAS) and high-precision force sensor II5 carry out synchronized sampling, with the F that samples
1With F
2Pass through F=2F
2-F
1Computing formula obtain F; Drafting power value curve, this curve directly demonstrates waveform and the numerical values recited of the power of loading, by this curve, power sensor 6 is demarcated.
At last, it is also to be noted that, what more than enumerate is only a specific embodiment of the present invention.Obviously, the invention is not restricted to above embodiment, many distortion can also be arranged.All distortion that those of ordinary skill in the art can directly derive or associate from content disclosed by the invention all should be thought protection scope of the present invention.
Claims (2)
1. be applicable to the caliberating device of fatigue tester loading force value, comprise the cylinder (1) with piston (2), data acquisition system (DAS) (3), high-precision force sensor I(4), power sensor (6) and the fixture (7) that is used for gripping sample (8), it is characterized in that: described caliberating device also comprises high-precision force sensor II(5), fixedly mount successively high-precision force sensor I(4 between piston (2) and fixture (7)), high-precision force sensor II(5) and power sensor (6), described high-precision force sensor I(4) with high-precision force sensor II(5) all be connected with data acquisition system (DAS) (3) signal, described high-precision force sensor I(4) and high-precision force sensor II(5) belong to identical high-precision force sensor.
2. the loading force value scaling method that utilizes caliberating device as claimed in claim 1 to carry out is characterized in that comprising the following steps:
1), to high-precision force sensor I(4) and high-precision force sensor II(5) carry out respectively zero clearing and process, be defined as follows after zero clearing: high-precision force sensor I(4) power of sampling is defined as F
1, high-precision force sensor II(5) sampling power be defined as F
2
2), begin to carry out torture test after, data acquisition system (DAS) (3) is to high-precision force sensor I(4) and high-precision force sensor II(5) carry out synchronized sampling, with the F that samples
1With F
2Pass through F=2F
2-F
1Computing formula obtain F; Described F is the calibration value of power sensor (6).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110397311 CN102435525B (en) | 2011-12-05 | 2011-12-05 | Loading force value calibrating method suitable for fatigue-testing machine and applied calibrating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110397311 CN102435525B (en) | 2011-12-05 | 2011-12-05 | Loading force value calibrating method suitable for fatigue-testing machine and applied calibrating device |
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| CN102435525A CN102435525A (en) | 2012-05-02 |
| CN102435525B true CN102435525B (en) | 2013-06-19 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104122082B (en) * | 2014-07-08 | 2016-08-24 | 广州鑫源恒业电力线路器材股份有限公司 | A kind of conductor spacer damping characteristic and fatigue test system |
| CN104568637B (en) * | 2015-01-26 | 2016-11-16 | 孙钦密 | Rolling wear test machine calibration equipment |
| CN105181511B (en) * | 2015-07-31 | 2017-12-15 | 铁道第三勘察设计院集团有限公司 | Conventional earthwork test Instrument power generating value verification caliberating device in situ |
| CN105403475A (en) * | 2015-12-30 | 2016-03-16 | 广西玉柴机器股份有限公司 | Calibrating device for universal strength tester |
| CN106052956B (en) * | 2016-07-22 | 2019-03-26 | 上海市计量测试技术研究院 | A kind of power hammer sensitivity self-checking device and its calibration method |
| CN107860459A (en) * | 2017-10-18 | 2018-03-30 | 上海斐讯数据通信技术有限公司 | A kind of human body balance demarcation machine and its pneumatic stepless regulating method and system |
| CN107621422A (en) * | 2017-10-25 | 2018-01-23 | 北京富力通达科技有限公司 | Big load multi dimension load transducer and its demarcation metering method |
| CN108760545B (en) * | 2018-07-12 | 2021-02-26 | 浙江工业大学 | Mean load loading error compensation method for resonant fatigue testing machine |
| CN114199711B (en) * | 2021-11-30 | 2024-01-09 | 天津大学 | Torque calibration method for tension-torsion fatigue testing machine |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0611427A (en) * | 1992-06-29 | 1994-01-21 | Fujitsu Ltd | Fatigue testing device |
| CN2220638Y (en) * | 1994-12-28 | 1996-02-21 | 中国航空工业总公司第三○四研究所 | Device for making dynamic demarcation for force transducer |
| CN101776506B (en) * | 2010-01-28 | 2011-12-14 | 燕山大学 | Calibrating and loading bench of large multi-dimensional force transducer |
| CN101929902A (en) * | 2010-03-23 | 2010-12-29 | 昆山市创新科技检测仪器有限公司 | Loading device with high-precision force |
| CN202372421U (en) * | 2011-12-05 | 2012-08-08 | 浙江工商大学 | Calibration device applicable to loading force value of fatigue testing machine |
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