CN114264404A - Zero setting method of force transducer for structural strength test - Google Patents
Zero setting method of force transducer for structural strength test Download PDFInfo
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- CN114264404A CN114264404A CN202111621484.8A CN202111621484A CN114264404A CN 114264404 A CN114264404 A CN 114264404A CN 202111621484 A CN202111621484 A CN 202111621484A CN 114264404 A CN114264404 A CN 114264404A
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- 238000012360 testing method Methods 0.000 title claims abstract description 23
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Abstract
The zero setting method of the force sensor for the structural strength test belongs to the technical field of measurement and control, the force sensor is directly connected with a measured object, under the condition of not applying a loading force, the value measured by the force sensor is originally 0 value, under the condition of not carrying out zero setting, the force sensor can be deviated to the left or the right, according to the output feedback to the size relation with the theoretical load value, whether the output feedback value is pulled or pressed is judged, then, the zero output error in a sensor verification record table and the full measuring range of the force sensor are utilized, the zero output value can be accurately calculated, the zero output value is re-filled into the zero parameter Overall Offset of the force sensor, the accurate zero setting can be carried out, meanwhile, the measured object does not need to be disassembled, the zero setting can be completed on test equipment, the time is saved, and the working efficiency is improved, the disassembly safety risk is reduced.
Description
Technical Field
The application belongs to the technical field of measurement and control, and particularly relates to a zero setting method of a force transducer for a structural strength test.
Background
In the structural strength test, the zero setting of the load cell used at each loading point is an essential process. The accuracy of zero point adjustment is directly related to whether the load applied to each loading point is correct. The traditional zero-setting method is to coordinate a loading control system to complete zero-point adjustment of each loading point under the condition that a load cell is not loaded before the load cell of each loading point is not connected with a loading supporting clamp. The zero-setting method has certain disadvantages that in the test process, especially in a fatigue test with relatively more loading points, when loads of a plurality of loading points are abnormal or structural stress is abnormal and the loads of the loading points need to be calibrated or detected, the load cell and the supporting clamp of the loading points need to be disassembled, and then zero-setting is carried out according to the traditional method. Therefore, the workload is greatly increased, the test progress is influenced, certain safety risk is brought, and when the loading point is disassembled and needs to operate in the air, the safety risk is greater.
Therefore, how to set the zero of the load cell for the structural strength test more simply, efficiently and lowly is a problem to be solved.
Disclosure of Invention
The application aims to provide a zero setting method of a force transducer for structural strength test, and aims to solve the problem that the zero setting of the force transducer is inconvenient in the test process in the prior art.
The technical scheme of the application is as follows: a zero setting method of a force transducer for a structural strength test comprises the steps of connecting the force transducer with a measured object, obtaining a theoretical value of a load borne by the force transducer, and executing the next step if the load measured by the force transducer is inconsistent with the theoretical value of the borne load; setting a zero point parameter Overall Offset of a force measuring sensor in the MOOG controller to be 0, and acquiring an output feedback value of the force measuring sensor; if the output feedback value is larger than the theoretical load value borne by the force transducer, adding a negative sign to the absolute value of the pressure-direction zero value in the verification record table of the force transducer to be used as a zero point of the force transducer; if the output feedback value is smaller than the theoretical load value borne by the force transducer, using the absolute value of the pull-to-zero value in the force transducer verification record table as the zero point of the force transducer; and acquiring the calculated zero output value and re-filling the zero parameter Overall Offset of the force sensor, and completing the zero adjustment of the force sensor.
Preferably, when the output feedback value is larger than the theoretical load value borne by the force transducer, the calculation method of the output value pressed to the zero point is that the zero point output value Zby-Z × F.S | × (-1); wherein Z is the zero output error percentage in units% F.S; F.S is the load cell full scale, in kN or N.
Preferably, when the output feedback value is smaller than the theoretical load value borne by the load cell, the method for calculating the output value of the pull-direction part comprises the following step of calculating a zero output value Zbl| Z × F.S |; wherein Z is the zero output error percentage in units% F.S; F.S is the load cell full scale, in kN or N.
The zero setting method of the force sensor for the structural strength test of the application directly connects the force sensor with the object to be tested, under the condition of not applying loading force, the value measured by the force sensor is 0 value, under the condition of not zeroing, the force measuring sensor is deviated to the left or the right, whether the output feedback value is pulled or pressed to the load is judged according to the magnitude relation between the output feedback value and the theoretical load value, the zero output error in the sensor verification record table and the full measuring range of the force measuring sensor are utilized, the zero output value can be accurately calculated, the zero output value is re-filled into the zero parameter Overall Offset of the force measuring sensor, can carry out accurate zero setting, need not dismantle the measured object simultaneously, can accomplish zero setting on test equipment, save the time, improve work efficiency, reduce and dismantle safe risk.
Drawings
In order to more clearly illustrate the technical solutions provided by the present application, the following briefly introduces the accompanying drawings. It is to be expressly understood that the drawings described below are only illustrative of some embodiments of the invention.
FIG. 1 is a schematic overall flow diagram of the present application;
FIG. 2 is a feedback curve of a load cell that is not zeroed according to the present application;
FIG. 3 is a calibration chart of the force sensor of the present application;
FIG. 4 is a diagram of a load cell zero parameter override setting interface according to the present application;
FIG. 5 is a feedback curve of the load cell after zeroing according to the present application.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application.
A zeroing method of a load cell for structural strength test, as shown in fig. 1, includes the following steps:
step S100, connecting the force transducer with a measured object, obtaining a theoretical value of a load borne by the force transducer, and executing the next step if the load measured by the force transducer is inconsistent with the theoretical value of the load borne by the force transducer; zero setting is not carried out before the force transducer is connected with a measured object, if the measured output feedback value of the force transducer is not consistent with the theoretical value of the load, the zero point of the force transducer is not at the set zero point, and therefore zero setting is required; if the output feedback value of the force sensor is the same as the load, the zero point of the force sensor is at the set zero point, and zero setting is not needed at the moment.
Step S200, setting a zero point parameter Overall Offset of a force measuring sensor in the MOOG controller to be 0, and acquiring an output feedback value of the force measuring sensor; the output feedback value of the force sensor has two conditions, one is that the output feedback value is at the left of the set zero point, namely the zero point of the force sensor is smaller than the set zero point and is in a pulling state; one is that the zero point is set to the right, namely the zero point of the load cell is larger than the set zero point, and the load cell is in a pressing state.
Step S300, if the output feedback value is larger than the theoretical load value borne by the force transducer, namely in a pressing state, adding a minus sign to the absolute value of the pressure zero value in the verification record table of the force transducer to be used as a zero point of the force transducer; the value of the pressing zero point in the pressing state is a positive value, the value of the pressing zero point set by the force sensor can be used as the zero point of the force sensor only by subtracting the output value of the pressing zero point, and the specific calculation method is as follows:
zero output value Zby＝|Z×F.S|×(－1)；
Wherein Z is the zero output error percentage in units% F.S; F.S is a full-scale load cell in kN or N, ZbyI.e. the value of the voltage towards zero output.
Step S400, if the output feedback value is smaller than the theoretical load value borne by the force transducer, namely in a pulling state, using the absolute value of the pulling zero point value in the verification record table of the force transducer as the zero point of the force transducer; the zero point value of the pull direction under the pull direction state is a negative value, the zero point value of the pull direction set by the force measuring sensor can be accurately obtained by adding the absolute value of the output value of the pull direction zero point, and the specific calculation method is as follows:
zero output value Zbl＝|Z×F.S|；
Wherein Z is the zero output error percentage in units% F.S; F.S is the load cell full scale, in kN or N. ZblI.e. a pull to zero output value.
And step S500, acquiring the calculated zero output value, and re-filling the zero parameter Overall Offset of the force sensor, so that the zero adjustment of the force sensor is completed.
The zero output value can be accurately calculated by utilizing the zero output value which is fed back into the zero parameter Overall Offset of the force measuring sensor again, so that the accurate zero adjustment can be carried out, meanwhile, the measured object does not need to be disassembled, the zero adjustment can be completed on test equipment, the time is saved, the working efficiency is improved, and the disassembly safety risk is reduced.
As an embodiment, a zero setting method of a load cell for structural strength test is described as an embodiment,
after a certain load cell is connected to a control system in a non-zero state, a certain test piece with the weight of 78.3Kg is connected to the certain load cell, so that the load cell is subjected to 767N load (1Kg is approximately equal to 9.8N). Since the zero point of the sensor is unknown, the feedback value of the sensor is not the real load value, and therefore, the correct zero point value is calculated according to the method.
(1) And opening a load cell setting interface of the control system, setting the zero point parameter Overall Offset of the load cell to 0, and obtaining a feedback value of the sensor, wherein the average value is 1020.61N as shown in fig. 2.
(2) If the average value is larger than 767N, according to step 3, the pressure of the calibration record table of the load cell provided by the metering department within the validity period is inquired and the error Z is output to the zero point, as shown in figure 3.
(3) Calculating the zero output value ZbyThis value is input to the zero position, as shown in fig. 4.
Zero output value Zby＝|Z×F.S|×(－1)＝500000×0.49％×(－1)＝－245。
(4) Looking at the feedback curve of the load cell after zeroing, as shown in fig. 5, the mean sensor feedback was 774.13N.
(5) The feedback average value of the load cell is 774.13N, the load value 767N applied to the load cell by a test piece, and the absolute value of the error between the feedback average value and the load value is 7.13N. The accuracy of the load cell was rated on a scale of 0.1, with an allowable error of + -0.1% F.S, i.e., + -50N, according to the general Specification for pressure Sensors (GJB 4409A-2011) for accuracy ratings. Obviously, the error is 7.13N within the allowable error range of the load cell, and the feedback value measured by the load cell is reliable and effective.
The method improves the traditional zero setting method of the force measuring sensor, greatly reduces the disassembly workload, saves time, improves the working efficiency, reduces the safety risk caused by secondary disassembly of the test piece, does not need any cost or capital investment, and really realizes zero cost.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (3)
1. A zero setting method of a force transducer for a structural strength test is characterized by comprising the following steps: connecting a force measuring sensor and a measured object, acquiring a theoretical value of a load borne by the force measuring sensor, and executing the next step if the load measured by the force measuring sensor is inconsistent with the theoretical value of the load borne by the force measuring sensor;
setting a zero point parameter OverallOffset of a force measuring sensor in the MOOG controller to be 0, and acquiring an output feedback value of the force measuring sensor;
if the output feedback value is larger than the theoretical load value borne by the force transducer, adding a negative sign to the absolute value of the pressure-direction zero value in the verification record table of the force transducer to be used as a zero point of the force transducer;
if the output feedback value is smaller than the theoretical load value borne by the force transducer, using the absolute value of the pull-to-zero value in the force transducer verification record table as the zero point of the force transducer;
and acquiring the calculated zero output value and re-filling the zero parameter Overall Offset of the force sensor, and completing the zero adjustment of the force sensor.
2. The method of zeroing a load cell for structural strength testing according to claim 1, characterized by: when the output feedback value is larger than the theoretical load value borne by the force transducer, the calculation method of the output value pressed to the zero point comprises the following steps,
zero output value Zby＝|Z×F.S|×(－1)；
Wherein Z is the zero output error percentage in units% F.S; F.S is the load cell full scale, in kN or N.
3. The method of zeroing a load cell for structural strength testing according to claim 1, characterized by: when the output feedback value is smaller than the theoretical load value borne by the force transducer, the method for calculating the output value of the pull-direction part comprises the following steps,
zero output value Zbl＝|Z×F.S|；
Wherein Z is the zero output error percentage in units% F.S; F.S is the load cell full scale, in kN or N.
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