CN212206526U - Dynamic-static shear unloading vibration starting device with free vibration structure - Google Patents

Dynamic-static shear unloading vibration starting device with free vibration structure Download PDF

Info

Publication number
CN212206526U
CN212206526U CN202021224980.0U CN202021224980U CN212206526U CN 212206526 U CN212206526 U CN 212206526U CN 202021224980 U CN202021224980 U CN 202021224980U CN 212206526 U CN212206526 U CN 212206526U
Authority
CN
China
Prior art keywords
shearing
vibration
dynamic
static
tested piece
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202021224980.0U
Other languages
Chinese (zh)
Inventor
盖迪
苏长青
霍琳
王志
辛斌
赵芳芳
张剑伟
王天明
王欢
陈磊
胡泊
董立辉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenyang Aerospace University
Original Assignee
Shenyang Aerospace University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenyang Aerospace University filed Critical Shenyang Aerospace University
Priority to CN202021224980.0U priority Critical patent/CN212206526U/en
Application granted granted Critical
Publication of CN212206526U publication Critical patent/CN212206526U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

A dynamic-static shearing force unloading vibration starting device with free vibration of a structure comprises a dynamic-static loading piston, a two-way hydraulic oil cylinder, a counter-force rigid frame, a shearing T-shaped component, a shearing concave component, a drawing pin, a drawing device support, an electric quick drawing device, a drawing device adjusting slide rail, a drawing device connecting rod, a pressure sensor, a laser deflectometer, a tested piece, a slidable support, a waveform vibration pickup, a dynamic data acquisition instrument, a computer and a servo hydraulic pump; the use method of the dynamic-static shearing force unloading vibration starting device for the free vibration of the structure comprises the following steps: step 1, mounting a tested piece; step 2, determining a test mode according to design requirements; step 3, determining a vibration starting mode and carrying out an experiment; and 4, collating the experimental data and determining the residual service life of the tested piece. The utility model discloses an adopt shear force or displacement uninstallation in the twinkling of an eye to arouse the principle of structural vibration, make the structure produce free vibration, improved the reliability of vibration experiment test data.

Description

Dynamic-static shear unloading vibration starting device with free vibration structure
Technical Field
The utility model belongs to the technical field of the structure experiment, involve the excitation form of structure free vibration, especially relate to a structure free vibration move-quiet shear force uninstallation start vibration device, unload the shear force in the twinkling of an eye at the loading in-process and arouse the start vibration device of structure vibration.
Background
In order to perform experimental analysis on data of the structure, such as vibration deflection, vibration frequency, vibration mode and the like, a large-scale laboratory vibration starting device is often needed, the existing vibration starting device often enables the structure to generate forced vibration according to a certain frequency, free vibration of the structure is difficult to realize, and the free vibration state of the structure can reflect mechanical indexes and the health state of the structure more truly and accurately. The existing experimental equipment is difficult to truly realize the free vibration of the structure, and the initial force or the initial displacement of the free vibration of the structure cannot be controlled.
The structure dynamic test acquisition system (MTS) which is commonly used for the structural vibration test at present enables the structure to start vibration and is usually realized by combining a high-power servo pump station and a dynamic loading actuator, and the test process is that a test piece is controlled by the actuator to generate forced vibration with fixed waveform at first, and then the actuating force of the actuator is withdrawn quickly so as to enable the structure to generate free vibration under the action of the waveform. The vibration test by adopting the loading mode has high equipment value (about ten million yuan), and the stress and displacement of the sample which can generate free vibration are greatly limited, so that the mechanical characteristics of the sample can not be completely reflected. Therefore, it is important to provide a dynamic-static shear unloading vibration-starting device for free vibration of the structure.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model provides a dynamic-static shearing force unloading and vibration starting device with free vibration structure. The utility model discloses the technical scheme who adopts shear force or displacement uninstallation in the twinkling of an eye to arouse the principle of structural vibration, and this kind of method can release in the twinkling of an eye and act on structural force or displacement and impel the structure to produce free vibration. The experimental device greatly improves the reliability of structural vibration experiment test data.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a dynamic-static shearing force unloading vibration-starting device with free vibration structure comprises a counter-force rigid frame, a slidable support, a shearing T-shaped member and a shearing concave member, wherein the slidable support is slidably mounted on the ground, a tested piece is arranged on the upper surface of the slidable support, a plurality of waveform vibration pickups are mounted on the outer surface of the tested piece, the output ends of the waveform vibration pickups are connected with the input end of a dynamic data acquisition instrument, the output end of the dynamic data acquisition instrument is connected with the input end of a computer, the shearing concave member is arranged at the center of the upper surface of the tested piece and is positioned right below the shearing T-shaped member, shearing holes are correspondingly formed in the shearing concave member and the shearing T-shaped member, the shearing T-shaped member is provided with a groove of the shearing concave member, the shearing holes extend into the groove and the groove, the shearing concave member and the groove are relatively fixed through pins mounted in the shearing holes, and, the device comprises a puller support, and is characterized in that an electric quick puller is arranged on the puller support, a counter-force rigid frame is fixedly arranged on the ground, a bidirectional hydraulic oil cylinder is arranged at the center of the counter-force rigid frame, one end of a dynamic-static loading piston of the bidirectional hydraulic oil cylinder extends out of the counter-force rigid frame, a pressure sensor is fixedly arranged at the bottom of the other end of the counter-force rigid frame, an oil inlet and an oil outlet of the bidirectional hydraulic oil cylinder are respectively connected with a servo hydraulic pump through pipelines, two puller adjusting slide rails are arranged on the counter-force rigid frame, the two puller adjusting slide rails are symmetrically arranged relative to the bidirectional hydraulic oil cylinder, the puller adjusting slide rails and the electric quick puller are respectively hinged to two ends of.
The shearing holes are equal-diameter shearing holes or conical shearing holes, and when the shearing holes formed in the shearing T-shaped member and the shearing concave member are equal-diameter shearing holes, the shearing holes are relatively fixed through shearing pins arranged in the equal-diameter shearing holes; when the shearing holes formed in the shearing T-shaped member and the shearing concave member are conical shearing holes, the shearing T-shaped member and the shearing concave member are relatively fixed through the drawing pins arranged in the conical shearing holes.
The use method of the dynamic-static shearing force unloading vibration starting device for the free vibration of the structure comprises the following steps:
step 1: placing the tested piece on a slidable support, adjusting the position of each component of the device, ensuring that the centers of the dynamic-static loading piston, the pressure sensor, the shearing T-shaped component, the shearing concave component and the tested piece are aligned, and enabling the shearing concave component to be tightly attached to the tested piece;
step 2: according to the experimental design requirements, carrying out a static loading experiment, a dynamic impact loading experiment or a dynamic-static combined loading experiment; the static loading test is a loading mode that pressure liquid is directly injected into the bidirectional hydraulic oil cylinder by using the servo hydraulic pump, static force is applied to the dynamic-static loading piston by the pressure liquid, and the static force is transmitted to a tested piece through the shearing T-shaped component and the shearing concave component in sequence; the dynamic impact loading refers to a loading mode that a heavy object impacts a dynamic-static loading piston to enable impact load to be transmitted to a tested piece through a shearing T-shaped component and a shearing concave component in sequence; the dynamic and static combined loading test is a loading mode that static loading and dynamic impact loading are jointly acted on a tested piece;
and step 3: determining the starting vibration mode and carrying out experiments,
when performing the static loading experiment:
if the shear unloading mode is adopted for vibration starting, firstly, the size and the number of the shear pins are calculated and determined through a shear stress calculation formula according to the vibration starting load; secondly, penetrating the shearing pins with determined size and number into the equal-diameter shearing holes communicated with the shearing T-shaped member and the shearing concave member; finally, a servo hydraulic pump is started, a dynamic-static loading piston moves downwards under the action of hydraulic oil to press and shear the T-shaped component, when the loading force reaches a preset value in an experiment, the shearing pin is suddenly sheared and damaged, the shearing T-shaped component falls into a groove of the shearing concave component, and the loading force is instantly unloaded, so that the free vibration of the tested piece is caused; transmitting the picked waveform data to a dynamic data acquisition instrument through a waveform vibration pickup, and then transmitting the data to a computer through the dynamic data acquisition instrument;
if the fixed deflection mode is adopted for oscillation starting, firstly, calculating and determining the minimum diameter of the drawn pin through a shear stress calculation formula according to the displacement value of the oscillation starting; secondly, penetrating the determined drawing pin into a conical shearing hole communicated with the shearing T-shaped member and the shearing concave member, and enabling a caliper of the electric quick drawing device to clamp the end part of the drawing pin; finally, a servo hydraulic pump is started, a dynamic-static loading piston moves downwards under the action of hydraulic oil to press and shear the T-shaped component, when the laser deflectometer detects that the tested piece is loaded to a preset deflection, an electric quick puller is started, a connecting rod of the puller moves towards two ends along a regulating slide rail of the puller, a pulling pin is quickly pulled out from the T-shaped component and the concave component, at the moment, the T-shaped component falls into a groove of the concave component, and the displacement borne by the tested piece is unloaded instantly, so that the free vibration of the tested piece is caused; transmitting the picked waveform data to a dynamic data acquisition instrument through a waveform vibration pickup, and then transmitting the data to a computer through the dynamic data acquisition instrument;
when performing the dynamic impact loading experiment:
if the shear unloading mode is adopted for vibration starting, firstly, the size and the number of the shear pins are calculated and determined through a shear stress calculation formula according to the vibration starting load; secondly, penetrating the shearing pins with determined size and number into the equal-diameter shearing holes communicated with the shearing T-shaped member and the shearing concave member; finally, the dynamic-static loading piston moves downwards to impact and shear the T-shaped component through instant falling impact of the weight, the shear pin is subjected to shear damage suddenly, the shear T-shaped component falls into a groove of the shear concave component at the moment, and the loading force is unloaded instantly, so that free vibration of the tested piece is caused; transmitting the picked waveform data to a dynamic data acquisition instrument through a waveform vibration pickup, and then transmitting the data to a computer through the dynamic data acquisition instrument;
when a dynamic and static combined loading test is adopted:
if the shear unloading mode is adopted for vibration starting, firstly, the size and the number of the shear pins are calculated and determined through a shear stress calculation formula according to the vibration starting load; secondly, penetrating the shearing pins with determined size and number into the equal-diameter shearing holes communicated with the shearing T-shaped member and the shearing concave member; finally, a servo hydraulic pump is started, a dynamic-static loading piston moves downwards under the action of hydraulic oil to press and shear the T-shaped component, after a preset static force value is reached, a weight drops down instantly to impact the dynamic-static loading piston, the shearing pin is subjected to shearing damage suddenly, the shearing T-shaped component falls into a groove of the shearing concave component at the moment, and the loading force is unloaded instantly, so that free vibration of the tested piece is caused; transmitting the picked waveform data to a dynamic data acquisition instrument through a waveform vibration pickup, and then transmitting the data to a computer through the dynamic data acquisition instrument;
if the fixed deflection mode is adopted for oscillation starting, firstly, calculating and determining the minimum diameter of the drawn pin through a shear stress calculation formula according to the displacement value of the oscillation starting; secondly, penetrating the determined drawing pin into a conical shearing hole communicated with the shearing T-shaped member and the shearing concave member, and enabling a caliper of the electric quick drawing device to clamp the end part of the drawing pin; finally, a servo hydraulic pump is started, a dynamic-static loading piston moves downwards under the action of hydraulic oil to press and shear the T-shaped component, after the preset deflection is reached, the dynamic-static loading piston moves downwards to impact and shear the T-shaped component through instant falling impact of a weight, and simultaneously an electric quick puller is started, a connecting rod of the puller moves towards two ends along an adjusting slide rail of the puller, the pulling pin is quickly pulled out from the T-shaped component and the concave shearing component, at the moment, the T-shaped component falls into a groove of the concave shearing component, and the tested piece is unloaded instantly after being subjected to displacement, so that free vibration of the tested piece is caused; transmitting the picked waveform data to a dynamic data acquisition instrument through a waveform vibration pickup, and then transmitting the data to a computer through the dynamic data acquisition instrument;
and 4, respectively acquiring the waveform amplitude and frequency of each measuring point of the tested piece under different vibration-initiating stresses or vibration-initiating deflection, the internal stress value and strain value of each measuring point and the total deflection value, analyzing each order modal vibration curve of the tested piece by processing experimental data so as to obtain the natural frequency, the damping ratio, the modal vibration type and the stress-strain curve of the tested piece in the vibration process, counting all experimental analysis results of each group, summarizing the internal damage condition of the tested piece and the health data of the tested piece, and determining the residual service life of the tested piece by combining different industry relevant specifications.
The weight impact loading in the step 3 is loading by adopting a loading mode of releasing the weight above, and the weight impact loading is divided into two conditions: the first is to load by using rigid weights, and different dynamic loading waveforms are caused by the instant falling of the rigid weights with different shapes; the second is to use an elastic rubber weight for loading, and different dynamic loading waveforms are caused by the instant falling of the elastic rubber weight.
The utility model has the advantages that:
1. the utility model discloses the experimental mode of device has directly changed traditional experimental method, directly becomes the initiative vibration of test piece with traditional test piece passive vibration to eliminated in the traditional experimental method because the interference that the frequency of actuating of experiment machine dynamic load actuator self brought for the experimental result, thereby the experimental result has directly embodied the inherent mechanical property of test piece self. By adopting the principle that the structure vibrates due to instant shearing force or displacement unloading, the method can instantly release the force or displacement acting on the structure to promote the structure to generate free vibration. The experimental device greatly improves the reliability of structural vibration experiment test data.
2. According to the required test demand, the utility model discloses the device can carry out static loading experiment, dynamic impact loading experiment or move-quiet combination loading experiment to reach the nimble various, the vibration mode of loading mode is nimble various, test data is accurate reliable, purpose such as experimental low cost.
3. Because in this kind of experiment, the required time of experiment often need consume 4-6 hours, and the piece format tested is hundreds, adopts the utility model discloses device and method, singly organize the experiment and only need 0.5 hours, and test efficiency will improve greatly, consequently will bring huge economic benefits for the very big reduction cost of labor of this kind of experiment, time cost and power cost.
Drawings
FIG. 1 is a schematic structural view of a dynamic-static combined unloading vibration-starting device for a structural free vibration experiment of the present invention;
FIG. 2 is a schematic structural view of a shear unloading mode vibration-inducing member;
FIG. 3 is a schematic structural view of a fixed deflection mode vibration starting member;
FIG. 4 is a schematic diagram of a shearing concave member shearing hole arrangement;
FIG. 5 is a schematic view of a shear hole arrangement for a shear T-shaped member;
1-dynamic-static loading piston, 2-bidirectional hydraulic oil cylinder, 3-counterforce rigid frame, 4-shearing T-shaped component, 5-shearing concave component, 6-drawing pin, 7-drawing device support, 8-electric quick drawing device, 9-drawing device adjusting slide rail, 10-drawing device connecting rod, 11-pressure sensor, 12-laser deflectometer, 13-tested piece, 14-slidable support, 15-waveform vibration pickup, 16-dynamic data acquisition instrument, 17-computer and 18-servo hydraulic pump.
Detailed Description
The following detailed description of the preferred embodiments of the present invention will be provided in conjunction with the accompanying drawings, so as to enable those skilled in the art to more easily understand the advantages and features of the present invention, and thereby define the scope of the invention more clearly and clearly.
As shown in fig. 1 to 5, a dynamic-static shearing force unloading vibration-starting device with free vibration structure comprises a counter-force rigid frame 3, a slidable support 14, a shearing T-shaped member 4 and a shearing concave member 5, wherein the slidable support 14 is slidably mounted on the ground, a tested piece 13 is arranged on the upper surface of the slidable support 14, a plurality of waveform vibration pickers 15 are mounted on the outer surface of the tested piece 13, the output ends of the waveform vibration pickers 15 are connected with the input end of a dynamic data collector 16, the output end of the dynamic data collector 16 is connected with the input end of a computer 17, the shearing concave member 5 is arranged at the center of the upper surface of the tested piece 13, the shearing concave member 5 is positioned right below the shearing T-shaped member 4, the shearing concave member 5 and the shearing T-shaped member are correspondingly provided with shearing holes, and the shearing T-shaped member 4 is provided with grooves of the shearing concave member 5 into which the shearing holes extend, the two are relatively fixed through pins arranged in shearing holes, puller supports 7 are symmetrically arranged on the outer surface of a shearing concave component 5, an electric quick puller 8 is arranged on the puller support 7, a counter-force rigid frame 3 is fixedly arranged on the ground, a two-way hydraulic oil cylinder 2 is arranged at the center of the counter-force rigid frame 3, one end of a dynamic-static loading piston 1 of the two-way hydraulic oil cylinder 2 extends out of the counter-force rigid frame 3, a pressure sensor 11 is fixedly arranged at the bottom of the other end of the dynamic-static loading piston, oil inlet and outlet ports of the two-way hydraulic oil cylinder 2 are respectively connected with a servo hydraulic pump 18 through pipelines, two puller adjusting slide rails 9 are arranged on the counter-force rigid frame 3, the two puller adjusting slide rails 9 are symmetrically arranged relative to the two-way hydraulic oil cylinder 2, the puller adjusting slide rails 9 and the electric quick puller 8, the laser deflectometer 12 is arranged corresponding to the tested piece 13.
The shearing holes are equal-diameter shearing holes or conical shearing holes, and when the shearing holes formed in the shearing T-shaped member 4 and the shearing concave member 5 are equal-diameter shearing holes, the shearing holes are relatively fixed through shearing pins arranged in the equal-diameter shearing holes; when the shearing holes arranged on the shearing T-shaped member 4 and the shearing concave member 5 are conical shearing holes, the shearing T-shaped member and the shearing concave member are relatively fixed through the drawing pin 6 arranged in the conical shearing holes.
Example 1
Vibration apparatus body size (not including servo hydraulic pump 18): length × width × height (2300mm × 2400mm × 800 mm); the loading system is composed of a bidirectional hydraulic oil cylinder 2, a servo hydraulic pump 18 and a pipeline, and the loading system static load is as follows: 0-2000 kN; loading dynamic load of a system: 0-3000J; the shearing device is used for shearing the T-shaped component, shearing the concave component 5 and shearing the pin or drawing the pin 6, and the shearing load is as follows: 5-2000 kN; test sample size: length × width × height (10000mm × 2200mm × 1000 mm); strain rate: 100~101s-1
The use method of the dynamic-static shearing force unloading vibration starting device for the free vibration of the structure comprises the following steps:
step 1: placing the tested piece 13 on a slidable support 14, adjusting the position of each component of the device, ensuring that the centers of the dynamic-static loading piston 1, the pressure sensor 11, the shearing T-shaped component 4, the shearing concave component 5 and the tested piece 13 are aligned, and enabling the shearing concave component 5 to be tightly attached to the tested piece 13;
step 2: according to the experimental design requirements, carrying out a static loading experiment, a dynamic impact loading experiment or a dynamic-static combined loading experiment; the static loading test is a loading mode that pressure liquid is directly injected into the bidirectional hydraulic oil cylinder 2 by using the servo hydraulic pump 18, static force is applied to the dynamic-static loading piston 1 by the pressure liquid, and the static force is transmitted to the tested piece 13 through the shearing T-shaped component and the shearing concave component 5 in sequence; the dynamic impact loading refers to a loading mode that a heavy object is used for impacting the dynamic-static loading piston 1, so that impact load is transmitted to the tested piece 13 through the shearing T-shaped component and the shearing concave component 5 in sequence; the dynamic and static combined loading test is a loading mode that static loading and dynamic impact loading are jointly acted on the tested piece 13;
and step 3: determining a vibration starting mode and carrying out an experiment, when a static loading experiment is carried out, adopting a shear unloading mode to start vibration, and firstly calculating and determining the size and the number of shear pins according to a vibration starting load through a shear stress calculation formula; secondly, penetrating the shearing pins with determined size and number into the equal-diameter shearing holes communicated with the shearing T-shaped member 4 and the shearing concave member 5; finally, a servo hydraulic pump 18 is started, a dynamic-static loading piston 1 moves downwards under the action of hydraulic oil to press and shear the T-shaped component 4, when the loading force reaches a preset value in an experiment, a shearing pin is suddenly sheared and damaged, the shearing T-shaped component falls into a groove of the shearing concave component 5, and the loading force is instantly unloaded, so that the free vibration of the tested piece 13 is caused; the picked-up waveform data is transferred to a dynamic data collector 16 by a waveform vibration pickup 15, and then the data is transmitted to a computer 17 by the dynamic data collector 16;
and 4, respectively acquiring the waveform amplitude and frequency of each measuring point of the tested piece 13 under different vibration-initiating stresses or vibration-initiating deflections, the internal stress value and strain value of each measuring point and the total deflection value, analyzing each order modal vibration curve of the tested piece 13 by processing experimental data so as to obtain the natural frequency, the damping ratio, the modal vibration type and the stress-strain curve of the tested piece 13 in the vibration process, counting all experimental analysis results of each group, summarizing the internal damage condition of the tested piece 13 and the health data of the tested piece 13, and determining the residual service life of the tested piece 13 by combining different industry relevant specifications.
Example 2
The use method of the dynamic-static shearing force unloading vibration starting device for the free vibration of the structure comprises the following steps:
step 1: placing the tested piece 13 on a slidable support 14, adjusting the position of each component of the device, ensuring that the centers of the dynamic-static loading piston 1, the pressure sensor 11, the shearing T-shaped component 4, the shearing concave component 5 and the tested piece 13 are aligned, and enabling the shearing concave component 5 to be tightly attached to the tested piece 13;
step 2: according to the experimental design requirements, carrying out a static loading experiment, a dynamic impact loading experiment or a dynamic-static combined loading experiment; the static loading test is a loading mode that pressure liquid is directly injected into the bidirectional hydraulic oil cylinder 2 by using the servo hydraulic pump 18, static force is applied to the dynamic-static loading piston 1 by the pressure liquid, and the static force is transmitted to the tested piece 13 through the shearing T-shaped component and the shearing concave component 5 in sequence; the dynamic impact loading refers to a loading mode that a heavy object is used for impacting the dynamic-static loading piston 1, so that impact load is transmitted to the tested piece 13 through the shearing T-shaped component and the shearing concave component 5 in sequence; the dynamic and static combined loading test is a loading mode that static loading and dynamic impact loading are jointly acted on the tested piece 13;
and step 3: determining a vibration starting mode and carrying out an experiment, when a static loading experiment is carried out, adopting a fixed deflection mode to start vibration, and firstly calculating and determining the minimum diameter of the drawing pin 6 according to a displacement value of the vibration starting through a shear stress calculation formula; secondly, penetrating the determined drawing pin 6 into a conical shearing hole communicated with the shearing T-shaped member 4 and the shearing concave member 5, and enabling a caliper of an electric quick drawing device 8 to clamp the end part of the drawing pin 6; finally, a servo hydraulic pump 18 is started, a dynamic-static loading piston 1 moves downwards under the action of hydraulic oil to press and shear the T-shaped component 4, when a laser deflectometer 12 detects that the tested piece 13 is loaded to a preset deflection, an electric quick puller 8 is started, a puller connecting rod 10 moves towards two ends along a puller adjusting slide rail 9, a pulling pin 6 is quickly pulled out from the shearing T-shaped component 4 and the shearing concave component 5, the shearing T-shaped component falls into a groove of the shearing concave component 5 at the moment, and the tested piece 13 is unloaded instantaneously in terms of displacement, so that free vibration of the tested piece 13 is caused; the picked-up waveform data is transferred to a dynamic data collector 16 by a waveform vibration pickup 15, and then the data is transmitted to a computer 17 by the dynamic data collector 16;
and 4, respectively acquiring the waveform amplitude and frequency of each measuring point of the tested piece 13 under different vibration-initiating stresses or vibration-initiating deflections, the internal stress value and strain value of each measuring point and the total deflection value, analyzing each order modal vibration curve of the tested piece 13 by processing experimental data so as to obtain the natural frequency, the damping ratio, the modal vibration type and the stress-strain curve of the tested piece 13 in the vibration process, counting all experimental analysis results of each group, summarizing the internal damage condition of the tested piece 13 and the health data of the tested piece 13, and determining the residual service life of the tested piece 13 by combining different industry relevant specifications.
Example 3
The use method of the dynamic-static shearing force unloading vibration starting device for the free vibration of the structure comprises the following steps:
step 1: placing the tested piece 13 on a slidable support 14, adjusting the position of each component of the device, ensuring that the centers of the dynamic-static loading piston 1, the pressure sensor 11, the shearing T-shaped component 4, the shearing concave component 5 and the tested piece 13 are aligned, and enabling the shearing concave component 5 to be tightly attached to the tested piece 13;
step 2: according to the experimental design requirements, carrying out a static loading experiment, a dynamic impact loading experiment or a dynamic-static combined loading experiment; the static loading test is a loading mode that pressure liquid is directly injected into the bidirectional hydraulic oil cylinder 2 by using the servo hydraulic pump 18, static force is applied to the dynamic-static loading piston 1 by the pressure liquid, and the static force is transmitted to the tested piece 13 through the shearing T-shaped component and the shearing concave component 5 in sequence; the dynamic impact loading refers to a loading mode that a heavy object is used for impacting the dynamic-static loading piston 1, so that impact load is transmitted to the tested piece 13 through the shearing T-shaped component and the shearing concave component 5 in sequence; the dynamic and static combined loading test is a loading mode that static loading and dynamic impact loading are jointly acted on the tested piece 13;
and step 3: determining a vibration starting mode and carrying out an experiment, when a dynamic impact loading experiment is carried out, adopting a shear unloading mode to start vibration, and firstly calculating and determining the size and the number of shear pins according to a vibration starting load through a shear stress calculation formula; secondly, penetrating the shearing pins with determined size and number into the equal-diameter shearing holes communicated with the shearing T-shaped member 4 and the shearing concave member 5; finally, the T-shaped component 4 is sheared by moving the impact dynamic-static loading piston 1 downwards through the instant falling of the rigid weight, the shearing pin is suddenly sheared and damaged, the shearing T-shaped component falls into the groove of the shearing concave component 5 at the moment, and the loading force is instantly unloaded, so that the free vibration of the tested piece 13 is caused; the picked-up waveform data is transferred to a dynamic data collector 16 by a waveform vibration pickup 15, and then the data is transmitted to a computer 17 by the dynamic data collector 16;
and 4, respectively acquiring the waveform amplitude and frequency of each measuring point of the tested piece 13 under different vibration-initiating stresses or vibration-initiating deflections, the internal stress value and strain value of each measuring point and the total deflection value, analyzing each order modal vibration curve of the tested piece 13 by processing experimental data so as to obtain the natural frequency, the damping ratio, the modal vibration type and the stress-strain curve of the tested piece 13 in the vibration process, counting all experimental analysis results of each group, summarizing the internal damage condition of the tested piece 13 and the health data of the tested piece 13, and determining the residual service life of the tested piece 13 by combining different industry relevant specifications.
Example 4
The use method of the dynamic-static shearing force unloading vibration starting device for the free vibration of the structure comprises the following steps:
step 1: placing the tested piece 13 on a slidable support 14, adjusting the position of each component of the device, ensuring that the centers of the dynamic-static loading piston 1, the pressure sensor 11, the shearing T-shaped component 4, the shearing concave component 5 and the tested piece 13 are aligned, and enabling the shearing concave component 5 to be tightly attached to the tested piece 13;
step 2: according to the experimental design requirements, carrying out a static loading experiment, a dynamic impact loading experiment or a dynamic-static combined loading experiment; the static loading test is a loading mode that pressure liquid is directly injected into the bidirectional hydraulic oil cylinder 2 by using the servo hydraulic pump 18, static force is applied to the dynamic-static loading piston 1 by the pressure liquid, and the static force is transmitted to the tested piece 13 through the shearing T-shaped component and the shearing concave component 5 in sequence; the dynamic impact loading refers to a loading mode that a heavy object is used for impacting the dynamic-static loading piston 1, so that impact load is transmitted to the tested piece 13 through the shearing T-shaped component and the shearing concave component 5 in sequence; the dynamic and static combined loading test is a loading mode that static loading and dynamic impact loading are jointly acted on the tested piece 13;
step 3, determining a vibration starting mode and carrying out an experiment, when a dynamic and static combined loading test is adopted, and vibration is started in a shearing force unloading mode, firstly, the size and the number of the shearing pins are calculated and determined through a shearing stress calculation formula according to vibration starting load; secondly, penetrating the shearing pins with determined size and number into the equal-diameter shearing holes communicated with the shearing T-shaped member 4 and the shearing concave member 5; finally, a servo hydraulic pump 18 is started, the dynamic-static loading piston 1 moves downwards under the action of hydraulic oil to press and shear the T-shaped component 4, after a preset static force value is reached, the dynamic-static loading piston 1 is impacted by instant falling of a rigid weight, a shear pin is suddenly sheared and damaged, the shear T-shaped component falls into a groove of the shear concave component 5 at the moment, and the loading force is instantly unloaded, so that free vibration of the tested piece 13 is caused; the picked-up waveform data is transferred to a dynamic data collector 16 by a waveform vibration pickup 15, and then the data is transmitted to a computer 17 by the dynamic data collector 16;
and 4, respectively acquiring the waveform amplitude and frequency of each measuring point of the tested piece 13 under different vibration-initiating stresses or vibration-initiating deflections, the internal stress value and strain value of each measuring point and the total deflection value, analyzing each order modal vibration curve of the tested piece 13 by processing experimental data so as to obtain the natural frequency, the damping ratio, the modal vibration type and the stress-strain curve of the tested piece 13 in the vibration process, counting all experimental analysis results of each group, summarizing the internal damage condition of the tested piece 13 and the health data of the tested piece 13, and determining the residual service life of the tested piece 13 by combining different industry relevant specifications.
Example 5
The use method of the dynamic-static shearing force unloading vibration starting device for the free vibration of the structure comprises the following steps:
step 1: placing the tested piece 13 on a slidable support 14, adjusting the position of each component of the device, ensuring that the centers of the dynamic-static loading piston 1, the pressure sensor 11, the shearing T-shaped component 4, the shearing concave component 5 and the tested piece 13 are aligned, and enabling the shearing concave component 5 to be tightly attached to the tested piece 13;
step 2: according to the experimental design requirements, carrying out a static loading experiment, a dynamic impact loading experiment or a dynamic-static combined loading experiment; the static loading test is a loading mode that pressure liquid is directly injected into the bidirectional hydraulic oil cylinder 2 by using the servo hydraulic pump 18, static force is applied to the dynamic-static loading piston 1 by the pressure liquid, and the static force is transmitted to the tested piece 13 through the shearing T-shaped component and the shearing concave component 5 in sequence; the dynamic impact loading refers to a loading mode that a heavy object is used for impacting the dynamic-static loading piston 1, so that impact load is transmitted to the tested piece 13 through the shearing T-shaped component and the shearing concave component 5 in sequence; the dynamic and static combined loading test is a loading mode that static loading and dynamic impact loading are jointly acted on the tested piece 13;
step 3, determining a vibration starting mode and carrying out an experiment, when a dynamic and static combined loading test is adopted, starting vibration in a fixed deflection mode, and firstly calculating and determining the minimum diameter of the drawing pin 6 according to the displacement value of the vibration starting through a shearing stress calculation formula; secondly, penetrating the determined drawing pin 6 into a conical shearing hole communicated with the shearing T-shaped member 4 and the shearing concave member 5, and enabling a caliper of an electric quick drawing device 8 to clamp the end part of the drawing pin 6; finally, a servo hydraulic pump 18 is started, the dynamic-static loading piston 1 moves downwards under the action of hydraulic oil to press and shear the T-shaped component 4, after the preset deflection is reached, the dynamic-static loading piston 1 moves downwards through instant falling impact of a rigid weight to impact and shear the T-shaped component, and simultaneously, an electric quick puller 8 is started, a puller connecting rod 10 moves towards two ends along a puller adjusting slide rail 9, a pulling pin 6 is rapidly pulled out from the shearing T-shaped component 4 and the shearing concave component 5, the shearing T-shaped component falls into a groove of the shearing concave component 5 at the moment, and the tested piece 13 is unloaded instantly after being subjected to displacement, so that free vibration of the tested piece 13 is caused; the picked-up waveform data is transferred to a dynamic data collector 16 by a waveform vibration pickup 15, and then the data is transmitted to a computer 17 by the dynamic data collector 16;
and 4, respectively acquiring the waveform amplitude and frequency of each measuring point of the tested piece 13 under different vibration-initiating stresses or vibration-initiating deflections, the internal stress value and strain value of each measuring point and the total deflection value, analyzing each order modal vibration curve of the tested piece 13 by processing experimental data so as to obtain the natural frequency, the damping ratio, the modal vibration type and the stress-strain curve of the tested piece 13 in the vibration process, counting all experimental analysis results of each group, summarizing the internal damage condition of the tested piece 13 and the health data of the tested piece 13, and determining the residual service life of the tested piece 13 by combining different industry relevant specifications.

Claims (2)

1. A dynamic-static shearing force unloading vibration-starting device with free vibration of a structure is characterized by comprising a counter-force rigid frame, a slidable support, a shearing T-shaped component and a shearing concave component, wherein the slidable support is slidably mounted on the ground, a tested piece is arranged on the upper surface of the slidable support, a plurality of waveform vibration pickers are mounted on the outer surface of the tested piece, the output ends of the waveform vibration pickers are connected with the input end of a dynamic data acquisition instrument, the output end of the dynamic data acquisition instrument is connected with the input end of a computer, the shearing concave component is arranged at the center of the upper surface of the tested piece and is positioned right below the shearing T-shaped component, shearing holes are correspondingly formed in the shearing concave component and the shearing T-shaped component, the shearing holes are formed in the shearing T-shaped component and extend into grooves of the shearing concave component, and the shearing holes and the shearing concave component are relatively fixed, the device comprises a shearing concave component, and is characterized in that puller supports are symmetrically arranged on the outer surface of the shearing concave component, an electric quick puller is arranged on the puller supports, a counter-force rigid frame is fixedly arranged on the ground, a bidirectional hydraulic oil cylinder is arranged at the center of the counter-force rigid frame, one end of a dynamic-static loading piston of the bidirectional hydraulic oil cylinder extends out of the counter-force rigid frame, a pressure sensor is fixedly arranged at the bottom of the other end of the counter-force rigid frame, oil inlet and outlet ports of the bidirectional hydraulic oil cylinder are respectively connected with a servo hydraulic pump through pipelines, two puller adjusting slide rails are arranged on the counter-force rigid frame and symmetrically arranged relative to the bidirectional hydraulic oil cylinder, the puller adjusting slide rails and the electric quick puller are respectively hinged with two ends of a puller connecting rod.
2. The dynamic-static shear unloading vibration excitation device for the free vibration of the structure as claimed in claim 1, wherein: the shearing holes are equal-diameter shearing holes or conical shearing holes, and when the shearing holes formed in the shearing T-shaped member and the shearing concave member are equal-diameter shearing holes, the shearing holes are relatively fixed through shearing pins arranged in the equal-diameter shearing holes; when the shearing holes formed in the shearing T-shaped member and the shearing concave member are conical shearing holes, the shearing T-shaped member and the shearing concave member are relatively fixed through the drawing pins arranged in the conical shearing holes.
CN202021224980.0U 2020-06-29 2020-06-29 Dynamic-static shear unloading vibration starting device with free vibration structure Active CN212206526U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202021224980.0U CN212206526U (en) 2020-06-29 2020-06-29 Dynamic-static shear unloading vibration starting device with free vibration structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202021224980.0U CN212206526U (en) 2020-06-29 2020-06-29 Dynamic-static shear unloading vibration starting device with free vibration structure

Publications (1)

Publication Number Publication Date
CN212206526U true CN212206526U (en) 2020-12-22

Family

ID=73817695

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202021224980.0U Active CN212206526U (en) 2020-06-29 2020-06-29 Dynamic-static shear unloading vibration starting device with free vibration structure

Country Status (1)

Country Link
CN (1) CN212206526U (en)

Similar Documents

Publication Publication Date Title
CN102901669A (en) 8-analogue-shaped soil uniaxial tensile tester
CN201277925Y (en) Concrete stress-strain full curve test apparatus with loading speed controllable
CN105043976A (en) Test device for dynamically measuring fretting pair frictional coefficient during fretting fatigue process and test method
CN106525577A (en) Device and method for testing dynamic mechanical properties of materials under tensile/shear combined loading
CN102706224B (en) Friction load loading device
CN102589989A (en) Single-shaped pulling-pressing double-function creepmeter
CN104237015B (en) The device of high speed dynamic compressive test
CN102252910A (en) True triaxial testing device for servo control rock
CN102353592A (en) On-site servo controlled actual triaxial testing apparatus for rock mass
CN103163016A (en) Auxiliary device for carrying out axial tension test on quasi brittle materials
CN212206526U (en) Dynamic-static shear unloading vibration starting device with free vibration structure
CN103528900B (en) Ultrahigh-strain-rate precise-stretching in-situ testing platform
CN201000399Y (en) Device for testing performance of jack
CN201043928Y (en) Adjustable exciting gun
CN109030242B (en) Electromagnetic power rock direct shear apparatus and operation method
CN201844947U (en) Comprehensive test stand for prestressed anchorage device and connector
US3628378A (en) Pneumatic portable dynamometer
CN105445568A (en) Piezoelectric film electromechanical characteristic testing device
CN102323047A (en) Testing combined surface tangential dynamic characteristic device
CN104913988A (en) Hopkinson principle-based concrete axial tensile strength measuring method
CN111579186A (en) Dynamic-static shear unloading vibration starting device with free vibration structure and using method
CN107884279A (en) The horizontal full Digitized Servo Control direct tensile test system of rock
CN202101906U (en) Servo control device of rock mass true triaxial test
CN102478440A (en) Novel mechanical force measuring machine and calibration method
CN107462480A (en) A kind of snowplough impeller impact test apparatus

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant