CN102053061A - Large joint surface experiment device - Google Patents
Large joint surface experiment device Download PDFInfo
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- CN102053061A CN102053061A CN 201010515497 CN201010515497A CN102053061A CN 102053061 A CN102053061 A CN 102053061A CN 201010515497 CN201010515497 CN 201010515497 CN 201010515497 A CN201010515497 A CN 201010515497A CN 102053061 A CN102053061 A CN 102053061A
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Abstract
The invention relates to a large joint surface experiment device, in particular to a large joint surface normal rigidity and tangential rigidity detection device and method. The device comprises a normal augmentor (1) in a mechanical frame, a normal eddy current sensor (2), an upper test specimen (3), an acceleration sensor (4), a tangential augmentor (5), a lower test specimen (6), a working platform (7), a tangential eddy current sensor (8), a tangential force sensor (9) and an upper computer for calculating the characteristics of a joint surface. In the method, a periodical external force load and the deformation of the joint surface under the periodical external force load are measured in a Kelvin-Voight model, a delaying curve of the periodical process is made, and the rigidity and damping characteristics of the joint surface are obtained. The large joint surface normal rigidity and tangential rigidity detection device can be used for measuring static and dynamic normal rigidities and damps of the large fixed joint surface, and can realize the characteristics of the joint surface when loaded with a positive load, an unbalance load and an impact load.
Description
Technical field
Large-scale faying face experimental provision relates to the measurement proving installation, relates in particular to a kind of large-scale faying face normal stiffness and tangential rigidity detection device and method.
Background technology
There is a large amount of faying faces in the mechanical part, spring that faying face embodies and damping characteristic are the important component parts of the characteristic of mechanical part rigidity and damping, still it is for lathe, the joint portion produces damping and accounts for about 90% of whole lathe damping, and the rigidity of joint portion and reliability also are a weak link with respect to lathe rigidity, and the 60%-80% of lathe global stiffness is determined by the faying face contact stiffness.Therefore, be necessary, can improve the performance of producing engineering goods largely for the research of joint portion.
The joint portion is normally linked together by the pretension of two planes by different modes, and interaction by faying face embodies its characteristic.Therefore, do not have the fixed physical model to review, can only study the quiet dynamic perfromance of faying face by experiment for the research of faying face.Yet of a great variety for faying face, form is different, and the required device that experimentizes also lacks versatility, and various characteristics is difficult to measure on a table apparatus.
Traditional faying face measurement mechanism as shown in Figure 1, test method is as follows:
At first measure the physical dimension of test specimen, the roughness of faying face, contact area, flatness tolerance and record are selected prefastening load and exciting mode and frequency according to this contact area.With selected prefastening load and exciting mode and frequency input supervisory controller, upper computer control system generates corresponding electricity signal frequently then, and this signal is converted to corresponding exciting force signal by vibrator again after power amplifier module amplifies.Vibrator acts on the faying face test specimen, its acting force enters upper computer control system by force transducer and through signal amplifier and A/D sampling, and the system responses acceleration of faying face test specimen and displacement signal then also enter upper computer control system through signal amplifier and A/D sampling by acceleration transducer and current vortex sensor.The frequency response curve of sample system be can obtain by the host computer analytic system, and the rigidity and the damping of joint portion picked out.
Because this device can only load and only be applicable to the small size test specimen of unit area method from a direction, this has just limited the usable range of device, can only use in research institutions.Because the diversity of faying face, the characteristic of different faying faces varies, and needs a kind of device of measuring the faying face characteristic more comprehensively, especially needs a kind of device that can measure big faying face.
Summary of the invention
The object of the present invention is to provide a kind of contact area of can measuring near 0.01m
2The measurement mechanism of large-scale fixed combinating surface, realize the measurement of the stiffness and damping characteristic under the different operating modes of large-scale faying face, and propose measurement and discrimination method for large-scale faying face rigidity and damping characteristic.
To achieve these goals, the following technical scheme of the present invention's employing:
Design a kind of large-scale faying face experimental provision, by the normal direction augmentor 1 in mechanical framework, normal direction current vortex sensor 2, on test specimen 3, acceleration transducer 4, tangential stress application device 5, the host computer of test specimen 6, worktable 7, tangential current vortex sensor 8, tangential force sensor 9 and calculations incorporated face characteristic is formed down.Wherein, worktable 7 is arranged on the bottom of mechanical framework, and the table top of worktable 7 is the workplace that is provided with uniform T-slot; Following test specimen 6 is placed on the worktable 7, and the bottom surface of following test specimen 6 is provided with detachable positioning boss, and positioning boss embeds in the T-slot of worktable 7; Normal direction augmentor 1 is positioned at test specimen 6 tops down, and is connected with last test specimen 3; 2, four normal direction current vortex sensors 2 of four normal direction current vortex sensors are set between normal direction augmentor 1 and following test specimen 6 evenly are arranged on down test specimen 6 edges; Center in following test specimen 6 side direction is provided with tangential stress application device 5 along the T-slot direction, and tangential stress application device 5 is fixed on the worktable 7; Between tangential stress application device 5 and following test specimen 6 sides, tangential force sensor 9 is set; The opposite side of the following test specimen 6 of corresponding tangential stress application device 5 is provided with tangential current vortex sensor 8; On the end face of following test specimen 6, acceleration transducer 4 is set; Each sensor is received host computer, and the while host computer is by power amplifier and be installed in vibrator driving normal direction augmentor 1.
Described vibrator adopts the coil type loading head.
Described normal direction augmentor 1 has the manual preconditioner of screw type.
Described tangential stress application device 5 is the hand wheel type hand regulator.
The method that above-mentioned large-scale faying face experimental provision is measured faying face stiffness and damping characteristic is as follows:
1) go up test specimen 3 and following test specimen 6 according to classification manufacturing, wherein classification comprises the surfaceness of test specimen, plane corrugated degree, physical dimension and material;
2) test specimen 6 down is installed, is made down the positioning boss of test specimen 6 embed T type groove, except that the unbalance loading experiment, the center of following test specimen 6 will overlap with normal direction augmentor 1 center of normal direction;
3) regulate normal direction augmentor 1, move and go up test specimen 3 positions, test specimen 3 is contacted with following test specimen 6;
4) carry out loading experiment, measure corresponding sensor values,
In the experiment, normal direction augmentor 1 is realized controlled static afterburning p
0Load with dynamic force and load, and can load according to the loading force curve with the dynamic load frequencies omega; Tangential tangential stress application device 5 is by handwheel manual loading tangential force p
0The normal direction distortion is by four current vortex sensors 2 measurements all around; Tangential deformation is measured by tangential current vortex sensor 8; Acceleration responsive is measured by acceleration transducer 4;
By the difference of measurement requirement, the different measuring method is arranged in the loading procedure:
A) mensuration is to quiet rigidity, and the loading force of a series of separation that provide by normal direction augmentor 1 obtains the deflection under a series of specific load;
B) mensuration selects pretightning force p by host computer earlier to dynamic stiffness
0, the normal direction augmentor 1 by PC control carries out the loading of dynamic load frequencies omega then, obtains dynamic rate numerical value;
C) survey tangential rigidity, regulate tangential stress application device 5, by tangential force sensor 9 and following test specimen 6 contacts side surfaces, normal direction loads p
0The time, the loading force of a series of separation that tangential stress application device 5 provides obtains the deflection under a series of specific load;
5) take out data, calculate faying face stiffness and damping characterization result,
A) mensuration is applying p to quiet rigidity by measuring faying face
NomNormal pressure the time deflection u, draw the rigidity value of corresponding normal pressure,
B) mensuration to tangential dynamic stiffness, test specimen is carried in dynamic sinusoidal force in P ± Δ P scope, and measures the test piece deformation amount u in the corresponding loading cycle, the pressure that proposes by Konrad Konowalski and the non-linear biquadratic function model of displacement:
p
nom＝C
0+C
1u+C
2u
2+C
3u
3+C
4u
4
Simulate corresponding C
1, C
2, C
3, C
4Thereby, obtain faying face stiffness characteristics function:
C) for dynamic antivibration ginseng characteristic, utilize the Kelvin-Voight model, the sluggishness power consumption curve between the loading and unloading that obtains in the loading cycle that obtains when testing by analyzing calculates its damping characteristic,
Damping:
Wherein, ψ is a model power consumption coefficient,
E wherein
dBe sluggish loss energy, E
PdFor loading strain energy, E
PuBe the unloading strain energy, ω is the frequency of dynamic load power,
It is dynamic rate.
Beneficial effect of the present invention: (1) both energy measurement brief summary closes face, again the rigidity of the big faying face of energy measurement and damping characteristic; (2) measure normal stiffness and damping characteristic and tangential rigidity is to derive from same test specimen, therefore can from measurement data, seek two kinds of mutual relationships between the rigidity; (3) since down test specimen be mounted on the worktable, following test specimen determining positions the position of Center of Pressure, therefore can realize the loading of off-center load, and can be respectively when four normal direction current vortex sensors draw unbalance loading the stiffness variation of all directions; (4) the faying face test specimen Installation And Test that is easy to simple in structure.
Description of drawings
Fig. 1 tradition is in conjunction with interview experiment device figure
Fig. 2 Kelvin-Voight illustraton of model
The embodiment synoptic diagram of the medium-and-large-sized faying face experimental provision of Fig. 3 the present invention
A-A view among Fig. 4 Fig. 3
Among the figure: 1, the normal direction augmentor; 2, the normal direction current vortex sensor; 3, last test specimen; 4, acceleration transducer; 5, the tangential stress application device; 6, following test specimen; 7, worktable; 8, tangential current vortex sensor; 9, the tangential force sensor.
Embodiment
Below in conjunction with accompanying drawing the embodiment among the present invention is described specifically.
With reference to shown in Figure 3, the large-scale faying face experimental provision of present embodiment mainly by the normal direction augmentor 1 in mechanical framework, normal direction current vortex sensor 2, on test specimen 3, acceleration transducer 4, tangential stress application device 5, test specimen 6, worktable 7, tangential current vortex sensor 8, tangential force sensor form 9 down.Worktable 7 is arranged on the bottom of mechanical framework, and the table top of worktable 7 is the workplace that is provided with uniform T-slot; Following test specimen 6 is foursquare cylinder, and following test specimen 6 is placed on the worktable 7, and the bottom surface of following test specimen 6 is provided with positioning boss, and positioning boss embeds in the T-slot of worktable 7; Normal direction augmentor 1 is positioned at test specimen 6 tops down, and be connected with last test specimen 3, normal direction augmentor 1 is provided with the manual preconditioner of screw type, by regulating leading screw, normal direction augmentor 1 can move up and down, thereby test specimen 3 contacts with following test specimen 6 in the meticulous adjusting, goes up test specimen 3 and following test specimen 6 in the present embodiment with plane contact; Simultaneously 2, four normal direction current vortex sensors 2 of four normal direction current vortex sensors are set between normal direction augmentor 1 and following test specimen 6 and evenly are arranged on down test specimen 6 four edges; Center in following test specimen 6 side direction is provided with tangential stress application device 5 along the T-slot direction, and tangential stress application device 5 is fixed on the worktable 7; Between tangential stress application device 5 and following test specimen 6 sides, tangential force sensor 9 is set; The opposite side of the following test specimen 6 of corresponding tangential stress application device 5 is provided with tangential current vortex sensor 8; On the end face of following test specimen 6, acceleration transducer 4 is set.
The signal of each sensor is delivered to computing machine, obtains the measurement result of faying face rigidity and damping characteristic by test procedure.
The loading of normal direction augmentor 1 has the coil type of employing vibrator by computer control in the normal direction augmentor 1, this vibrator is driven by power amplifier by computing machine.On the one hand, vibrator is realized the loading of pretightning force by certain driving power; On the other hand, vibrator is realized dynamic load by the driving power that changes.
The ultimate principle of testing large faying face is in this device:
When measuring static rigidity: applying p by measuring faying face
NomNormal pressure the time deflection u, draw the rigidity value of corresponding normal pressure:
When measuring dynamic rate with damping: test specimen is carried in dynamic sinusoidal force in P ± Δ P scope, and measures the test piece deformation amount u in the corresponding loading cycle, by the pressure of Konrad Konowalski proposition and the non-linear biquadratic function model of displacement:
p
nom＝C
0+C
1u+C
2u
2+C
3u
3+C
4u
4
Can simulate corresponding C
1, C
2, C
3, C
4Thereby, obtain faying face stiffness characteristics function:
Then utilize Kelvin-Voight model (Fig. 2) for dynamic antivibration ginseng characteristic, the sluggishness power consumption curve between the loading and unloading that obtains in the loading cycle that obtains when testing by analyzing calculates its damping characteristic.P among the figure
aBe the dynamic load amplitude that loads, p
0Be pretightning force, δ
0Be pretightning force p
0The time faying face displacement, E
dBe sluggish loss energy, E
PdFor loading strain energy, E
PuBe the unloading strain energy.Faying face behavioral characteristics equation is: p (t)=k
dδ (t)+hv (t) wherein v (t) is the faying face relative velocity.In conjunction with the retardant curve that experiment obtains, the unit that disappears then can obtain the faying face damping characteristic.
Damping:
Wherein, ψ is a model power consumption coefficient,
(E
dBe sluggish loss energy, E
PdFor loading strain energy, E
PuBe the unloading strain energy), ω is the frequency of dynamic load power;
It is dynamic rate.
Each functions of components is as follows in the device: normal direction augmentor 1, mainly realize the normal force of loading specimen, and can realize that static(al) loads, can realize dynamic load again, promptly to realize P ± Δ P dynamic load power, wherein Δ P changed with the certain rule cycle.Tangential stress application device 5 is mainly realized the loading of tangential force, measures tangential stiffness characteristics under the effect of outer year certain pretightning force.Normal direction current vortex sensor 2 and tangential current vortex sensor 8 are used for measuring the deflection of faying face.Acceleration transducer 4 is used to measure the dynamic response of dynamic action faying face of following time.The faying face of last test specimen 3 and following test specimen 6 customizes, and makes several groups according to the difference of geometric parameter (as surfaceness, plane corrugated degree, physical dimension and material), is used for measuring the influence of various geometric faying face rigidity and damping characteristic.
Present embodiment is measured the method for faying face rigidity and damping characteristic and is carried out according to the following steps:
1. look for the T type groove of correct position that test specimen 6 down is installed, except that the unbalance loading experiment, the center of following test specimen 6 will overlap with normal direction augmentor 1 center of normal direction.
2. regulate normal direction augmentor 1 by the manual preconditioner of screw type, move and go up test specimen 3 positions, test specimen 3 is contacted with following test specimen 6.
3. carry out loading experiment, measure corresponding sensor values.Normal direction augmentor 1 can realize that static afterburning the loading with dynamic force loads, and the loading force curve is controlled, can serve as the effect of external drive and pretightning force in experiment.Tangential tangential stress application device 5 is by handwheel manual loading tangential force.The normal direction distortion is by four normal direction current vortex sensors 2 measurements all around, and tangential deformation is measured by tangential current vortex sensor 8; Its acceleration responsive is measured (high frequency) by acceleration transducer 4, complementary mutually correction the between acceleration transducer and four the normal direction current vortex sensors 2, and eliminate by the mean value of four normal direction current vortex sensors 2 and to measure influence inaccurate and that inhomogeneous deformation band is come.
Can the different measuring method be arranged by the difference of measurement requirement in the loading procedure:
1) mensuration is to quiet rigidity, and the loading force of a series of separation that provide by normal direction augmentor 1 obtains the deflection under a series of specific load.
2) mensuration selects pretightning force p by host computer earlier to dynamic stiffness
0And the dynamic load frequencies omega, the normal direction augmentor 1 by PC control loads then, obtains dynamic rate numerical value.
3) survey tangential rigidity, regulate tangential stress application device 5, by tangential force sensor 9 and following test specimen 6 contacts side surfaces, normal direction loads p
0The time, the loading force of a series of separation that tangential stress application device 5 provides obtains the deflection under a series of specific load.
4. taking-up data calculate faying face stiffness and damping characterization result,
1) mensuration is applying p to quiet rigidity by measuring faying face
NomNormal pressure the time deflection u, draw the rigidity value of corresponding normal pressure,
2) mensuration to tangential dynamic stiffness, test specimen is carried in dynamic sinusoidal force in P ± Δ P scope, and measures the test piece deformation amount u in the corresponding loading cycle, the pressure that proposes by Konrad Konowalski and the non-linear biquadratic function model of displacement:
p
nom＝C
0+C
1u+C
2u
2+C
3u
3+C
4u
4
Simulate corresponding C
1, C
2, C
3, C
4Thereby, obtain faying face stiffness characteristics function:
3) for dynamic antivibration ginseng characteristic, utilize the Kelvin-Voight model, the sluggishness power consumption curve between the loading and unloading that obtains in the loading cycle that obtains when testing by analyzing calculates its damping characteristic,
Damping:
Wherein, ψ is a model power consumption coefficient,
(E
dBe sluggish loss energy, E
PdFor loading strain energy, E
PuBe the unloading strain energy), ω is the frequency of dynamic load power,
It is dynamic rate.
Claims (5)
1. large-scale faying face experimental provision, host computer by the normal direction augmentor (1) in mechanical framework, normal direction current vortex sensor (2), last test specimen (3), acceleration transducer (4), tangential stress application device (5), following test specimen (6), worktable (7), tangential current vortex sensor (8), tangential force sensor (9) and calculations incorporated face characteristic is formed, it is characterized in that: worktable (7) is arranged on the bottom of mechanical framework, and the table top of worktable (7) is the workplace that is provided with uniform T-slot; Following test specimen (6) is placed on the worktable (7), and the bottom surface of following test specimen (6) is provided with detachable positioning boss, and positioning boss embeds in the T-slot of worktable (7); Normal direction augmentor (1) is positioned at test specimen (6) top down, and is connected with last test specimen (3); Between normal direction augmentor (1) and following test specimen (6) four normal direction current vortex sensors (2) are set, four normal direction current vortex sensors (2) evenly are arranged on down test specimen (6) edge; Center in following test specimen (6) side direction is provided with tangential stress application device (5) along the T-slot direction, and tangential stress application device (5) is fixed on the worktable (7); Between tangential stress application device (5) and following test specimen (6) side, tangential force sensor (9) is set; The opposite side of the following test specimen (6) of corresponding tangential stress application device (5) is provided with tangential current vortex sensor (8); On the end face of following test specimen (6), acceleration transducer (4) is set; Each sensor is received host computer, and the while host computer is by power amplifier and be installed in vibrator driving normal direction augmentor (1).
2. large-scale faying face experimental provision as claimed in claim 1 is characterized in that: described vibrator adopts the coil type loading head.
3. large-scale faying face experimental provision as claimed in claim 1 is characterized in that: described normal direction augmentor (1) has the manual preconditioner of screw type.
4. large-scale faying face experimental provision as claimed in claim 1 is characterized in that: described tangential stress application device (5) is the hand wheel type hand regulator.
5. large-scale faying face experimental provision is measured the method for faying face stiffness and damping characteristic, it is characterized in that:
1) go up test specimen (3) and following test specimen (6) according to classification manufacturing, wherein classification comprises the surfaceness of test specimen, plane corrugated degree, physical dimension and material;
2) test specimen (6) down is installed, is made down the positioning boss of test specimen (6) embed T type groove, except that the unbalance loading experiment, the center of following test specimen (6) will overlap with normal direction augmentor (1) center of normal direction;
3) regulate normal direction augmentor (1), move and go up test specimen (3) position, test specimen (3) is contacted with following test specimen (6);
4) carry out loading experiment, measure corresponding sensor values,
In the experiment, normal direction augmentor (1) is realized controlled static afterburning p
0Load with dynamic force and load, and can load according to the loading force curve with the dynamic load frequencies omega; Tangential tangential stress application device (5) is by handwheel manual loading tangential force p
0The normal direction distortion is by four current vortex sensors (2) measurement all around; Tangential deformation is measured by tangential current vortex sensor (8); Acceleration responsive is measured by acceleration transducer (4);
By the difference of measurement requirement, the different measuring method is arranged in the loading procedure:
A) mensuration is to quiet rigidity, and the loading force of a series of separation that provide by normal direction augmentor (1) obtains the deflection under a series of specific load;
B) mensuration selects pretightning force p by host computer earlier to dynamic stiffness
0, the normal direction augmentor (1) by PC control carries out the loading of dynamic load frequencies omega then, obtains dynamic rate numerical value;
C) survey tangential rigidity, regulate tangential stress application device (5), by tangential force sensor (9) and following test specimen (6) contacts side surfaces, normal direction loads p
0The time, the loading force of a series of separation that tangential stress application device (5) provides obtains the deflection under a series of specific load;
5) take out data, calculate faying face stiffness and damping characterization result,
A) mensuration is applying p to quiet rigidity by measuring faying face
NomNormal pressure the time deflection u, draw the rigidity value of corresponding normal pressure,
B) mensuration to tangential dynamic stiffness, test specimen is carried in dynamic sinusoidal force in P ± Δ P scope, and measures the test piece deformation amount u in the corresponding loading cycle, the pressure that proposes by Konrad Konowalski and the non-linear biquadratic function model of displacement:
p
nom＝C
0+C
1u+C
2u
2+C
3u
3+C
4u
4
Simulate corresponding C
1, C
2, C
3, C
4Thereby, obtain faying face stiffness characteristics function:
C) for dynamic antivibration ginseng characteristic, utilize the Kelvin-Voight model, the sluggishness power consumption curve between the loading and unloading that obtains in the loading cycle that obtains when testing by analyzing calculates its damping characteristic, damping:
Wherein, ψ is a model power consumption coefficient,
E wherein
dBe sluggish loss energy, E
PdFor loading strain energy, E
PuBe the unloading strain energy, ω is the frequency of dynamic load power,
It is dynamic rate.
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| CN102393330A (en) * | 2011-09-01 | 2012-03-28 | 北京工业大学 | Device for testing tangential stiffness property of joint surface |
| CN102410923A (en) * | 2011-08-09 | 2012-04-11 | 西安理工大学 | Rigid and non-linear relation testing device and method of cylindrical fit joint surface |
| CN102589865A (en) * | 2012-02-17 | 2012-07-18 | 北京工业大学 | Normal stiffness and hysteresis characteristic test experimental device for double-bolt joint surface |
| CN103149002A (en) * | 2013-02-05 | 2013-06-12 | 山东大学 | Testing device and method of normal dynamic characteristic parameter of combination face |
| CN104931215A (en) * | 2015-06-05 | 2015-09-23 | 西安交通大学 | Test device for acquiring torsional stiffness of mechanical junction surface |
| CN105784305A (en) * | 2016-03-28 | 2016-07-20 | 南京理工大学 | Sensor for measuring normal dynamic characteristic of combined surface |
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| CN102410923A (en) * | 2011-08-09 | 2012-04-11 | 西安理工大学 | Rigid and non-linear relation testing device and method of cylindrical fit joint surface |
| CN102410923B (en) * | 2011-08-09 | 2013-12-04 | 西安理工大学 | Rigid and non-linear relation testing device and method of cylindrical fit joint surface |
| CN102393330B (en) * | 2011-09-01 | 2013-10-16 | 北京工业大学 | Device for testing tangential stiffness property of joint surface |
| CN102393330A (en) * | 2011-09-01 | 2012-03-28 | 北京工业大学 | Device for testing tangential stiffness property of joint surface |
| CN102589865A (en) * | 2012-02-17 | 2012-07-18 | 北京工业大学 | Normal stiffness and hysteresis characteristic test experimental device for double-bolt joint surface |
| CN103149002A (en) * | 2013-02-05 | 2013-06-12 | 山东大学 | Testing device and method of normal dynamic characteristic parameter of combination face |
| CN103149002B (en) * | 2013-02-05 | 2015-05-13 | 山东大学 | Testing device and method of normal dynamic characteristic parameter of combination face |
| CN104931215A (en) * | 2015-06-05 | 2015-09-23 | 西安交通大学 | Test device for acquiring torsional stiffness of mechanical junction surface |
| CN104931215B (en) * | 2015-06-05 | 2017-08-25 | 西安交通大学 | A kind of test device for obtaining Machine Joint Surfaces torsional rigidity |
| CN105784305B (en) * | 2016-03-28 | 2018-09-25 | 南京理工大学 | Measure the sensor of faying face normal dynamic characteristics |
| CN105784305A (en) * | 2016-03-28 | 2016-07-20 | 南京理工大学 | Sensor for measuring normal dynamic characteristic of combined surface |
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| CN110018008A (en) * | 2019-03-27 | 2019-07-16 | 莱芜职业技术学院 | A kind of faying face rigidity test bench and its application method |
| CN110006750A (en) * | 2019-04-02 | 2019-07-12 | 清华大学 | Sphere shear stiffness dynamic measurement system based on optical method |
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| CN113375918B (en) * | 2021-05-28 | 2023-11-03 | 西安理工大学 | Sliding friction joint surface dynamic characteristic measuring device and measuring method |
| CN114354104A (en) * | 2021-12-03 | 2022-04-15 | 北京工业大学 | Device and method for measuring tangential stiffness of cosine wave regular-shape joint surface |
| CN117168798A (en) * | 2023-11-01 | 2023-12-05 | 东北大学 | Fixed faying surface dynamic and static rigidity parameter measuring device |
| CN117168798B (en) * | 2023-11-01 | 2024-01-02 | 东北大学 | Fixed faying surface dynamic and static rigidity parameter measuring device |
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