CN113551716A - Stress-strain detection method for mechanical property safety monitoring cloud system - Google Patents
Stress-strain detection method for mechanical property safety monitoring cloud system Download PDFInfo
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- CN113551716A CN113551716A CN202111107494.XA CN202111107494A CN113551716A CN 113551716 A CN113551716 A CN 113551716A CN 202111107494 A CN202111107494 A CN 202111107494A CN 113551716 A CN113551716 A CN 113551716A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
Abstract
The stress-strain detection method for the mechanical performance safety monitoring cloud system eliminates a plurality of environmental factors and the independent influence of shrinkage creep through the detection of a plurality of measurement data, establishes a threshold system suitable for a stressed plate based on the structure, load and environmental characteristics of the stressed plate, monitors the running state and the stress characteristics of the stressed plate in real time for a long time through the setting of a cloud database, and is efficient and simple and convenient in equipment.
Description
Technical Field
The invention belongs to the field of mechanical property detection, and particularly relates to a stress-strain detection method for a mechanical property safety monitoring cloud system.
Background
Structural elements having a shaped structure and capable of bearing the action of loads, called structural elements, such as: support, frame, cantilever crane, inside skeleton and support locating rack etc. after the structure is made, need carry out performance test, include: at present, the stress-strain measurement of the surface of a structural member is to fully stick a strain gauge or a strain flower on the surface, or to install a mechanical displacement meter at a fracture part needing attention to measure the stress-strain of the structural member.
When the surface is fully pasted with the strain gauge or the strain rosette for measurement, the preparation work is very complicated, and if the number of measurement points on the structural member is large, dozens of or even hundreds of strain gauges are pasted on the surface, so that the labor intensity is high. Moreover, the welded portion of the structural member cannot be measured by attaching a strain gauge or a strain gauge due to the uneven surface.
When the mechanical displacement meter is used for measuring, a measuring contact of the displacement meter can slide down with a structural member due to the fact that the structural member is distorted and deformed, and subsequent measurement cannot be carried out.
Therefore, the existing stress-strain measurement is contact measurement, the stress-strain measurement is difficult to be carried out on each measuring point on the structural member, and the method has important value and significance for providing a targeted monitoring technical guide and requirements.
Disclosure of Invention
The invention provides a stress-strain detection method for a mechanical performance safety monitoring cloud system, aiming at solving the problems of mechanical load bearing components, more diseases, large management pressure, high cost of the traditional safety monitoring system and method and the like.
The invention aims to realize the technical scheme that the stress-strain detection method for the mechanical property safety monitoring cloud system is realized, wherein the stress-strain detection method comprises the following steps of: the method comprises the following steps:
s1: extracting stress plate monitoring information without load from the original monitoring information of the stress plate, wherein the monitoring information comprises deflection, stress and corresponding environment temperature information, and establishing a dynamic function relation between the monitoring information and the environment temperature by a mathematical method;
s2: establishing a finite element model by a finite element method, analyzing the influence of the environmental temperature on the stress state of the stressed plate, and establishing a confidence interval of the influence of the temperature on the monitoring information of the stressed plate so as to judge the accuracy of the temperature influence;
s3: eliminating the influence of the temperature effect on the monitoring value through the cloud database and the temperature data obtained by finite element analysis;
s4: finding out a no-load point after eliminating the temperature effect from the original data, then periodically extracting the monitoring value of the point, finding that the increase rate of the monitoring value is gradually reduced and the value tends to be stable after a period of time is the value change caused by the shrinkage creep effect, and establishing a dynamic relational expression of the influence of the time and the shrinkage creep on the monitoring information by adopting a mathematical method;
s5: eliminating the influence of the shrinkage creep effect on the monitoring value;
s6: establishing a threshold system suitable for the stressed plate based on the structure, load and environmental characteristics of the stressed plate, wherein the threshold system is divided into primary green, secondary yellow, tertiary orange and quaternary red;
s7: according to the key points of the construction of the stress plate safety monitoring system, a monitoring cloud system and monitoring equipment suitable for the stress plate are established, stress, strain, deflection, temperature and humidity and shrinkage creep information are mainly monitored, and dynamic monitoring is adopted for the stress and the deflection.
Preferably, the threshold system setting comprises:
1) primary green early warning threshold:
2) secondary yellow early warning threshold:
3) third-level orange early warning threshold:
4) four-level red early warning threshold:
wherein:
Z1yrepresenting a primary green early warning threshold value;
Z2yindicating secondary yellow early warning threshold
Z3yIndicating three-level orange early warning threshold
Z4yRepresenting a four-level red early warning threshold value;
x represents a structural response value obtained by theoretical calculation;
Preferably, the monitoring cloud system of the stressed plate comprises an alarm system, a final data result is obtained by comparing data characteristics of a cloud database with a threshold table obtained by calculation after detection, the monitoring cloud system carries out remote alarm display, the alarm mode comprises images and sounds, meanwhile, on one hand, an alarm record is generated, on the one hand, offline evaluation is carried out, structural early warning is carried out on the offline evaluation, an alarm record is generated, and the alarm record is manually processed to generate a final alarm processing record.
Preferably, the monitoring device for the safety monitoring information of the stressed plate comprises a fixed seat, a connecting reaction rod and a measuring bin, wherein the fixed seat comprises a base, the base can be fixed on the lower end face of the stressed plate, a temperature sensor is arranged on the base, the temperature sensor can measure the temperature of the lower end face of the stressed plate, a temperature sensor meter is arranged on the upper end face of the stressed plate, so that the temperature difference of the upper part and the lower part of the stressed plate can be measured in real time, a fixed adjusting box is fixedly arranged below the base, a PCB is arranged inside the fixed adjusting box, a micro motor is arranged above the inner part of the fixed adjusting box, the PCB is respectively connected with the temperature sensor and the micro motor, a driven rod is arranged below the micro motor, one end of the driven rod is connected with the micro motor, and the other end of the driven rod penetrates through the fixed adjusting box to be fixedly connected with the connecting reaction rod, the measuring device is characterized in that a rotating valve is arranged between the driven rod and the fixed adjusting box, the rotating valve can enable the driven rod to be fixed in the fixed adjusting box, the driven rod can rotate around the driven rod and can move left and right, the other end of the connecting reaction rod is connected with the measuring bin, the connecting reaction rod is arranged between the connecting reaction rod and the measuring bin, and four groups of connecting reaction rods and fixing seats are arranged on the periphery of the measuring bin.
Preferably, the measuring bin comprises a shell, the shell is of a square structure with a hollow interior, through holes are formed in the periphery of the shell, the through holes are provided with the rotary valves, the through holes enable the connecting reaction rod to penetrate into the measuring bin, a measuring device is fixedly installed in the shell and is a semicircular cavity at the upper end, the lower end of the measuring device is cylindrical, position sensors are uniformly installed in the semicircular cavity at the upper end of the measuring device, a collision sensor is fixed at the upper end of the measuring device, three measuring balls are contained in the measuring device and can freely roll in the measuring device, a fixing plate is fixed above the collision sensor, a controller is fixedly installed above the fixing plate, a power supply is installed on the right side of the controller, an upper cover is installed above the measuring bin, and resistance-type measuring instruments are uniformly distributed around the measuring device, every the one end of connecting the reaction rod is fixed with resistance, be provided with the resistance needle on the resistance-type measuring apparatu, the resistance needle with resistance contact, resistance-type measuring apparatu accessible connecting reaction rod's removal changes resistance to survey real-time stress dependent variable.
In summary, the invention has the following beneficial technical effects:
the stress-strain detection method for the mechanical performance safety monitoring cloud system eliminates a plurality of environmental factors and the independent influence of shrinkage creep through the detection of a plurality of measurement data, establishes a threshold system suitable for a stressed plate based on the characteristics of the structure, load, environment and the like of the stressed plate, monitors the running state and the stress characteristics of the stressed plate in real time for a long time through the setting of a cloud database, and is efficient and simple and convenient in equipment.
The monitoring device designed by the invention eliminates the influence of the deformation of the stressed plate caused by the change of the temperature difference between the upper and lower during the measurement of stress strain by arranging the fixed seat, the connecting reaction rod and the measurement bin, can reflect the change to the database in real time, is suitable for long-term monitoring and use, realizes the construction of a dynamic integral finite element model of the stressed plate by setting the measurement ball in the measurement bin, provides an early warning structure for the resonance phenomenon of the stressed plate, and prevents the destructive influence of long-term resonance on the stressed plate.
Drawings
FIG. 1 is a schematic diagram of a method for detecting stress-strain for a mechanical safety monitoring cloud system according to the present invention;
FIG. 2 is a schematic diagram of an alarm system for a stress-strain detection method of a mechanical performance safety monitoring cloud system according to the present invention;
FIG. 3 is a schematic diagram of the relative positions of the monitoring device and the stressed plate of the present invention;
FIG. 4 is an overall schematic view of the monitoring device of the present invention;
FIG. 5 is a schematic cross-sectional view of a monitoring device of the present invention;
FIG. 6 is an enlarged schematic view of "E" of FIG. 5 of the present invention;
FIG. 7 is an enlarged schematic view of "F" of FIG. 5 of the present invention;
fig. 8 is a perspective view of a measuring device of the monitoring apparatus of the present invention.
In the figure: 1 fixed seat, 2 connecting reaction rod, 3 measuring cabin, 4 stressed plate, 101 base, 102 temperature sensor, 103PCB board, 104 fixed adjusting box, 105 micro motor, 106 driven rod, 201 rotating valve, 202 resistance, 301 shell, 303 measuring device, 304 position sensor, 305 collision sensor, 306 measuring ball, 307 fixed plate, 308 controller, 309 upper cover, 310 resistance measuring instrument, 311 resistance needle.
Detailed Description
A stress-strain detection method for a mechanical property safety monitoring cloud system is disclosed, wherein as shown in fig. 1, the method steps can be divided into:
s1: extracting stress plate monitoring information without load from the original monitoring information of the stress plate, wherein the monitoring information comprises deflection, stress and corresponding environment temperature information, and establishing a dynamic function relation between the monitoring information and the environment temperature by a mathematical method;
s2: establishing a finite element model by a finite element method, analyzing the influence of the environmental temperature on the stress state of the stressed plate, and establishing a confidence interval of the influence of the temperature on the monitoring information of the stressed plate so as to judge the accuracy of the temperature influence;
s3: eliminating the influence of the temperature effect on the monitoring value through the cloud database and the temperature data obtained by finite element analysis;
s4: finding out a no-load point after eliminating the temperature effect from the original data, then periodically extracting the monitoring value of the point, if the increase rate of the monitoring value is gradually reduced and tends to be stable after a period of time, the value is changed due to the shrinkage creep effect, and establishing a dynamic relational expression of the influence of the time and the shrinkage creep on the monitoring information by adopting a mathematical method;
s5: eliminating the influence of the shrinkage creep effect on the monitoring value;
s6: establishing a threshold system suitable for the stressed plate based on the structure, load and environmental characteristics of the stressed plate, wherein the threshold system is divided into primary green, secondary yellow, tertiary orange and quaternary red;
s7: according to the key points of the construction of the stress plate safety monitoring system, a monitoring cloud system and monitoring equipment suitable for the stress plate are established, stress, strain, deflection, temperature and humidity and shrinkage creep information are mainly monitored, and dynamic monitoring is adopted for the stress and the deflection.
Specifically, the threshold system setting suitable for the stressed plate safety monitoring includes:
1) primary green early warning threshold:
2) secondary yellow early warning threshold:
3) third-level orange early warning threshold:
4) four-level red early warning threshold:
wherein:
Z1yrepresenting a primary green early warning threshold value;
Z2yindicating secondary yellow early warning threshold
Z3yIndicating three-level orange early warning threshold
Z4yRepresenting a four-level red early warning threshold value;
x represents a structural response value obtained by theoretical calculation;
Specifically, the monitoring cloud system of the stressed plate comprises an alarm system, the alarm system is shown in fig. 2, the data characteristics of a cloud database are compared with a threshold table obtained through calculation after detection, a final data result is obtained, the monitoring cloud system carries out remote alarm display, an alarm mode comprises images and sounds, meanwhile, an alarm record is generated on one hand, off-line assessment is carried out on the one hand, structural early warning is carried out on the off-line assessment, the alarm record is generated, manual processing is carried out on the alarm record, and a final alarm processing record is generated.
Specifically, the monitoring device for the safety monitoring information of the stressed plate is shown in fig. 4, and comprises a fixed seat 1, a connecting reaction rod 2 and a measuring bin 3, wherein the fixed seat 1 comprises a base 101, the base 101 can be fixed on the lower end surface of the stressed plate 4, the position is shown in fig. 3, a temperature sensor 102 is arranged on the base 101, the temperature sensor 102 can measure the temperature of the lower end surface of the stressed plate 4, a temperature sensor is arranged on the upper end surface of the stressed plate 4, so that the temperature difference between the upper part and the lower part of the stressed plate 4 can be measured in real time, a fixed adjusting box 104 is fixedly arranged below the base 101, a PCB plate 103 is arranged inside the fixed adjusting box 104, a micro motor 105 is arranged above the fixed adjusting box 104, the PCB plate 103 is respectively connected with the temperature sensor 102 and the micro motor 105, a driven rod 106 is arranged below the micro motor 105, one end of the driven rod 106 is connected with the micro motor 105, the other end of the driven rod 106 penetrates through the fixed adjusting box 104 and is fixedly connected with the connecting reaction rod 2, a rotating valve 201 is arranged between the driven rod 106 and the fixed adjusting box 104, the rotating valve 201 can enable the driven rod 106 to be fixed in the fixed adjusting box 104, meanwhile, the driven rod 106 can rotate around the driven rod 106 and can move left and right, the other end of the connecting reaction rod 2 is connected with the measuring bin 3, the rotating valve 201 is arranged between the connecting reaction rod 2 and the measuring bin 3, and four groups of connecting reaction rods 2 and a fixed seat 1 are arranged on the periphery of the measuring bin 3.
Specifically, the measuring bin 3 includes a housing 301, the housing 301 is a square structure with a hollow interior, through holes are formed around the housing 301, the rotating valve 201 is installed on the through holes, the through holes enable the connecting reaction rod 2 to penetrate into the measuring bin 3, a measuring device 303 is fixedly installed inside the housing 301, the measuring device 303 is a semicircular cavity at the upper end, the lower end of the measuring device 303 is cylindrical, position sensors 304 are uniformly installed inside the semicircular cavity at the upper end of the measuring device 303, a collision sensor 305 is fixed at the upper end of the measuring device 303, three measuring balls 306 are contained inside the measuring device 303, the measuring balls 306 can freely roll inside the measuring device 303, a fixing plate 307 is fixed above the collision sensor 305, a controller 308 is fixedly installed above the fixing plate 307, and a power supply is installed on the right side of the controller 308, measure 3 tops in the storehouse and install upper cover 309, measuring device 303 equally divide all around and distribute resistance-type measuring apparatu 310, every the one end of connecting reaction rod 2 is fixed with resistance 202, be provided with resistance needle 311 on the resistance-type measuring apparatu 310, resistance needle 311 with the contact of resistance 202, resistance-type measuring apparatu 310 accessible connecting reaction rod 2's removal changes resistance to measure real-time stress strain volume.
The working principle is as follows: when the monitoring device is used, a plurality of monitoring devices are sequentially arranged on the lower end face of a stressed plate 4 to be monitored at uniform intervals, the monitoring devices can be connected with a cloud platform through a controller 308, the temperature sensor 102 on the fixed seat 1 and a thermometer on the upper surface transmit the temperatures above and below the stressed plate 4 into the PCB 103, the obtained confidence interval of the temperatures and the like which influence the monitoring information of the stressed plate is obtained, the PCB 103 controls the micro motor 105 to work to drive the driven rod 106 to rotate, the driven rod 106 moves leftwards or rightwards for a certain distance according to the rotation quantity of the micro motor 105, the moving distance quantity is determined according to the positive and negative difference of the upper and lower temperatures, so that the connecting reaction rod 2 can also move along with the driven rod 106, the moving quantity is the influence quantity of the real-time temperature on the stressed plate 4, and the temperature factor is compensated by the detected data, thereby removing the influence of the positive and negative temperature difference on the monitoring data.
The power of the measuring body is turned on, after the four connecting reaction rods 2 move a certain distance according to positive and negative temperature compensation, the distance between every two fixing seats 1 fixed below the stressed plate 4 changes due to the change of the stress strain of the stressed plate 4, at the moment, the fixing seats 1 are all fixed below the stressed plate 4, so the connecting reaction rods 2 move towards the inside of the measuring bin 3, one end of the connecting reaction rod 2 close to the measuring bin 3 is provided with a resistor 202, at the moment, a resistor needle 311 moves on the resistor 202 to a certain extent, so that the resistance of the resistance-type measuring instrument 310 changes, the resistance-type measuring instrument 310 can measure real-time stress strain, at the moment, the stress strain at each position is transmitted to a cloud database by a controller 308, at the moment, due to the arrangement of the measuring device, when the stress strain of the four fixing seats 1 changes due to the stress strain of the stressed plate 4, the distance between the fixed seat 1 and the measuring bin 3 is different, the measuring bin 3 can incline in different directions and different degrees at different positions of the stressed plate at the moment, the three measuring balls 306 arranged in the measuring device can fall to the lowest point due to gravity as shown in fig. 8, the position sensor 304 can transmit the positions of the middle points of the three small balls to the controller 308 at the moment, the controller 308 uploads the positions to the database, and the finite element model of the stressed plate 4 can be dynamically simulated through data analysis of the plurality of measuring bins 3 at the moment, so that real-time stressed plate monitoring data can be obtained.
Meanwhile, due to the arrangement of the three measuring balls 306, when the device is used for monitoring in a load state, the stressed plate 4 can generate uninterrupted vibration due to partial load, so that the measuring balls 306 vibrate with each other and bounce off, the mean value of stress strain of the stressed plate can be judged through the intermediate values of the positions of the three measuring balls 306 at the moment, when the stressed plate is in a resonance state due to some reasons, the damage degree to the stressed plate is large, at the moment, through the resonance phenomenon among the three measuring balls 306, the three measuring balls 306 bounce off with each other in resonance, so that the measuring balls 306 collide with the collision sensor 305 above the measuring device 303, at the moment, the controller 308 generates an alarm signal by using the signal, and uploads the alarm signal to a database, so that subsequent processing is manually performed.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (5)
1. A stress-strain detection method for a mechanical property safety monitoring cloud system is characterized by comprising the following steps: the method comprises the following steps:
s1: extracting stress plate monitoring information without load from the original monitoring information of the stress plate, wherein the monitoring information comprises deflection, stress and corresponding environment temperature information, and establishing a dynamic function relation between the monitoring information and the environment temperature by a mathematical method;
s2: establishing a finite element model by a finite element method, analyzing the influence of the environmental temperature on the stress state of the stressed plate, and establishing a confidence interval of the influence of the temperature on the monitoring information of the stressed plate so as to judge the accuracy of the temperature influence;
s3: eliminating the influence of the temperature effect on the monitoring value through the cloud database and the temperature data obtained by finite element analysis;
s4: finding out a no-load point after eliminating the temperature effect from the original data, then periodically extracting the monitoring value of the point, if the increase rate of the monitoring value is gradually reduced and tends to be stable after a period of time, the value is changed due to the shrinkage creep effect, and establishing a dynamic relational expression of the influence of the time and the shrinkage creep on the monitoring information by adopting a mathematical method;
s5: eliminating the influence of the shrinkage creep effect on the monitoring value;
s6: establishing a threshold system suitable for the stressed plate based on the structure, load and environmental characteristics of the stressed plate, wherein the threshold system is divided into primary green, secondary yellow, tertiary orange and quaternary red;
s7: according to the key points of the construction of the stress plate safety monitoring system, a monitoring cloud system and monitoring equipment suitable for the stress plate are established, stress, strain, deflection, temperature and humidity and shrinkage creep information are mainly monitored, and dynamic monitoring is adopted for the stress and the deflection.
2. The stress-strain detection method for the cloud system for mechanical property safety monitoring as claimed in claim 1, wherein the stress-strain detection method comprises the following steps: the threshold system setting comprises:
1) primary green early warning threshold:
2) secondary yellow early warning threshold:
3) third-level orange early warning threshold:
4) four-level red early warning threshold:
wherein:
Z1yrepresenting a primary green early warning threshold value;
Z2yindicating secondary yellow early warning threshold
Z3yIndicating three-level orange early warning threshold
Z4yRepresenting a four-level red early warning threshold value;
x represents a structural response value obtained by theoretical calculation;
3. The stress-strain detection method for the cloud system for mechanical property safety monitoring as claimed in claim 1, wherein the stress-strain detection method comprises the following steps: the monitoring cloud system of atress plate includes alarm system, compares through data characteristic and the threshold table that calculates after detecting of high in the clouds database, obtains final data result, and monitoring cloud system carries out remote alarm and shows, and the alarm mode includes image, sound, generates the alarm record on the one hand simultaneously, carries out off-line aassessment on the one hand, carries out structure early warning to off-line aassessment, generates the alarm record, the alarm record carries out manual processing, generates final alarm processing record.
4. The stress-strain detection method for the cloud system for mechanical property safety monitoring as claimed in claim 1, wherein the stress-strain detection method comprises the following steps: the monitoring device comprises a fixed seat (1), a connecting reaction rod (2) and a measuring bin (3), wherein the fixed seat (1) comprises a base (101), the base (101) can be fixed on the lower end face of a stressed plate (4), a temperature sensor (102) is arranged on the base (101), the temperature sensor (102) can measure the temperature of the lower end face of the stressed plate (4), a temperature sensor is arranged on the upper end face of the stressed plate (4) to measure the temperature difference between the upper part and the lower part of the stressed plate (4) in real time, a fixed adjusting box (104) is fixedly arranged below the base (101), a PCB (103) is arranged inside the fixed adjusting box (104), a micro motor (105) is arranged above the fixed adjusting box (104), and the PCB (103) is respectively connected with the temperature sensor (102) and the micro motor (105), micro motor (105) below is provided with driven lever (106), driven lever (106) one end links to each other with micro motor (105), driven lever (106) other end pass fixed regulation box (104) with connect reaction rod (2) fixed linking to each other, driven lever (106) with be provided with between fixed regulation box (104) rotary valve (201), rotary valve (201) can make driven lever (106) be fixed in fixed regulation box (104), make driven lever (106) can move about also when self pivoted simultaneously, connect reaction rod (2) the other end with measure storehouse (3) and be connected, connect reaction rod (2) with be provided with rotary valve (201) between measuring storehouse (3), it is provided with four groups connection reaction rod (2) and fixing base (1) all around to measure storehouse (3).
5. The stress-strain detection method for the cloud system for mechanical property safety monitoring as claimed in claim 4, wherein the stress-strain detection method comprises the following steps: the measuring bin (3) comprises a shell (301), the shell (301) is of an internal hollow square structure, through holes are formed in the periphery of the shell (301), the rotating valve (201) is installed on the through holes, the through holes enable the connecting reaction rod (2) to penetrate into the measuring bin (3), a measuring device (303) is fixedly installed inside the shell (301), the measuring device (303) is of an upper-end semicircular cavity body and cylindrical at the lower end, a position sensor (304) is uniformly installed inside the upper-end semicircular cavity body of the measuring device (303), a collision sensor (305) is fixed at the upper end of the measuring device (303), three measuring balls (306) are arranged inside the measuring device (303), the measuring balls (306) can freely roll inside the measuring device (303), and a fixing plate (307) is fixed above the collision sensor (305), fixed plate (307) top fixed mounting has controller (308), the power is installed on controller (308) right side, measure storehouse (3) top and install upper cover (309), equally divide cloth all around of measuring device (303) and have resistance-type measuring apparatu (310), every the one end of connecting reaction rod (2) is fixed with resistance (202), be provided with resistance needle (311) on resistance-type measuring apparatu (310), resistance needle (311) with resistance (202) contact, the removal change resistance of resistance-type measuring apparatu (310) accessible connecting reaction rod (2) to measure real-time stress strain volume.
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