CN111623909B - Stress test method for double-fork-arm two-force rod - Google Patents
Stress test method for double-fork-arm two-force rod Download PDFInfo
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- CN111623909B CN111623909B CN201910152095.1A CN201910152095A CN111623909B CN 111623909 B CN111623909 B CN 111623909B CN 201910152095 A CN201910152095 A CN 201910152095A CN 111623909 B CN111623909 B CN 111623909B
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- 238000010998 test method Methods 0.000 title claims abstract description 7
- 238000012360 testing method Methods 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000009662 stress testing Methods 0.000 claims description 5
- 239000011888 foil Substances 0.000 claims 2
- 238000005452 bending Methods 0.000 abstract description 9
- 238000007906 compression Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
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Abstract
The invention provides a stress test method for a double-fork-arm two-force rod, and relates to the field of vehicle test. The stress test method comprises the following steps: respectively sticking strain gauges to the relative positions of the inner side and the outer side of a first fork arm of the double-fork-arm two-force rod, and respectively sticking the strain gauges to the relative positions of the inner side and the outer side of a second fork arm; connecting the strain gauge on the first prong and the strain gauge on the second prong in series to form a full-bridge circuit; exerting tension and/or pressure on the double-fork arm two-force rod, and detecting the strain of the strain gauge through the full-bridge circuit; and obtaining a strain-stress relation curve when the double-fork-arm two-force rod deforms according to the detected strain. The strain gauge is pasted on the relative positions of the two fork arms of the double fork arms, so that the strain caused by bending deformation of the double fork arms in the stretching process is mutually offset, the linear relation between the strain of the strain gauge and the stretching deformation is not influenced by the bending deformation, and the stress of the double fork arm two-force rod can be accurately obtained.
Description
Technical Field
The invention relates to the field of vehicle testing, in particular to a stress testing method for a double-fork-arm two-force rod.
Background
Load spectrum acquisition tests are often required in the vehicle model development process and are used for bench iteration and CAE simulation, and the stress test of a two-force rod of a chassis is one of key parameters and needs to be accurately measured.
The stress test of the two-force rod has various methods, the most convenient and rapid method is to arrange two T-shaped strain gauges at the proper position of the rod piece at a radial interval of 180 degrees, calibrate the linear relation between the output and the strain, and reversely push out the stress data of the two-force rod through the strain data of the two-force rod obtained in the real-vehicle road test. However, the two-force rod structure has various forms: two force rods with two hinged ends; a C-shaped groove two-force rod; the end part is a two-force rod in a double-fork arm structure. The two-force rod with the former two structural forms can obtain the linear relation between the force and the strain of the two-force rod by adopting the bridge combination mode. However, the two-force rod with the end part in the form of the double-fork arm structure is special, especially the double-fork arms which are not parallel to each other, when the rod piece is pulled, the double-fork arm part can be bent to a certain degree while being stretched, the nonlinear deformation strain generated by bending deformation can not be offset, and the mutual superposition of the strain generated by stretching deformation can not be effectively distinguished.
Disclosure of Invention
The embodiment of the invention provides a stress test method for a double-fork-arm two-force rod, which is used for solving the problem that the two-force rod with the end parts of the double-fork arms which are not parallel to each other cannot obtain a strain-stress linear relation by adopting a traditional strain gauge pasting mode.
In order to solve the above technical problem, an embodiment of the present invention provides a method for testing a stress of a dual-fork arm two-force lever, including:
respectively sticking strain gauges to the relative positions of the inner side and the outer side of a first fork arm of the double-fork-arm two-force rod, and respectively sticking the strain gauges to the relative positions of the inner side and the outer side of a second fork arm;
connecting the strain gauge on the first prong and the strain gauge on the second prong in series to form a full-bridge circuit;
exerting tension and/or pressure on the double-fork arm two-force rod, and detecting the strain of the strain gauge through the full-bridge circuit;
and obtaining a strain-stress relation curve when the double-fork-arm two-force rod deforms according to the detected strain.
Further, the method further comprises:
acquiring strain data of the double-fork-arm two-force rod in an actual road test of a vehicle;
and determining the stress data of the double-fork-arm two-force rod during the actual road test of the vehicle according to the strain data and the strain-stress relation curve.
Further, connecting the strain gauge on the first prong in series with the strain gauge on the second prong to form a full-bridge circuit, comprising:
connecting the strain gauges on the first fork arm in series to form a first bridge arm, and connecting the strain gauges on the second fork arm in series to form a second bridge arm;
and connecting the first end of the first bridge arm with the first end of the second bridge arm, and connecting the second end of the first bridge arm with the second end of the second bridge arm to form a full-bridge circuit.
Further, a first resistor is connected between the first end of the first bridge arm and the first end of the second bridge arm, and a second resistor is connected between the second end of the first bridge arm and the second end of the second bridge arm.
Further, the resistance value of the first resistor, the resistance value of the second resistor, the resistance value of the strain gauge on the first bridge arm before deformation and the resistance value of the strain gauge on the second bridge arm before deformation are the same.
Further, exerting pulling force and/or pressure on the double-wishbone two-force rod, and detecting strain of the strain gauge through the full-bridge circuit, comprises:
inputting a constant voltage to a first end of the first bridge arm and a second end of the second bridge arm;
applying tension and/or pressure to the double-fork arm two-force rod, and detecting the voltage difference between the second end of the first bridge arm and the first end of the second bridge arm;
and calculating the strain of the strain gauge according to the voltage difference.
Further, according to the detected strain, obtaining a strain-stress relation curve when the dual-fork arm two-force rod deforms, including:
acquiring strain corresponding to the pressure and/or pressure value by changing the pressure and/or pressure value applied to the double-fork-arm two-force rod to obtain multiple groups of stress and strain data;
and acquiring a strain-stress relation curve when the double-fork-arm two-force rod deforms according to the acquired multiple groups of stress and strain data.
Further, according to the strain data and the strain-stress relation curve, determining stress data of the double-fork-arm two-force rod during the actual road test of the vehicle, including:
calculating a stress and strain relation according to the strain data and the strain-stress relation curve;
and substituting the strain data into the relational expression of the stress and the strain to obtain the stress data of the double-fork-arm two-force rod during the actual road test of the vehicle.
The invention has the beneficial effects that:
according to the scheme, the strain gauges are adhered to the opposite positions of the two fork arms of the double-fork arm, so that the strain generated by bending deformation of the double-fork arm in the stretching process is offset, and the linear relation between the strain of the strain gauge and the stretching deformation is not influenced by the bending deformation.
Drawings
FIG. 1 is a schematic flow chart of a force testing method for a dual-fork arm two-force lever according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of a full bridge circuit according to an embodiment of the present invention;
FIG. 3 shows a strain-force linear relationship for an embodiment of the present invention.
Description of reference numerals:
1-a first leg; 2-a second leg; 3-a first resistance; 4-second resistance.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The invention provides a stress test method for a double-fork arm two-force rod, aiming at the problem that the two-force rod with the end parts of double-fork arms which are not parallel to each other cannot obtain a strain-stress linear relation by adopting a traditional strain gauge pasting mode.
As shown in fig. 1, an embodiment of the present invention provides a method for testing a force applied to a dual-fork arm two-force lever, including:
and 11, respectively pasting strain gauges at the relative positions of the inner side and the outer side of the first fork arm of the double-fork-arm two-force rod, and respectively pasting strain gauges at the relative positions of the inner side and the outer side of the second fork arm.
And step 12, connecting the strain gauge on the first prong and the strain gauge on the second prong in series to form a full-bridge circuit.
Specifically, in conjunction with fig. 2, step 12 includes:
connecting the strain gauges on the first fork arm in series to form a first bridge arm 1, and connecting the strain gauges on the second fork arm in series to form a second bridge arm 2;
and connecting the first end of the first bridge arm 1 with the first end of the second bridge arm 2, and connecting the second end of the first bridge arm 1 with the second end of the second bridge arm 2 to form a full-bridge circuit.
It should be noted that a first resistor 3 is further connected between the first end of the first bridge arm 1 and the first end of the second bridge arm 2, a second resistor 4 is further connected between the second end of the first bridge arm 1 and the second end of the second bridge arm 2, the first resistor 3 forms a third bridge arm, and the second resistor 4 forms a fourth bridge arm.
Preferably, in order to make the measurement result more accurate, the first resistor 3 and the second resistor 4 are high-precision resistors with certain resistance values. And the resistance value of the first resistor 3, the resistance value of the second resistor 4, the resistance value of the strain gauge on the first bridge arm 1 before deformation and the resistance value of the strain gauge on the second bridge arm 2 before deformation are the same.
And step 13, applying tension and/or pressure on the double-fork arm two-force rod, and detecting the strain of the strain gauge through the full-bridge circuit.
Specifically, step 13 includes:
inputting a constant voltage to a first end of the first bridge arm 1 and a second end of the second bridge arm 2;
applying tension and/or pressure to the double-fork arm two-force rod, and detecting the voltage difference between the second end of the first bridge arm 1 and the first end of the second bridge arm 2;
and calculating the strain of the strain gauge according to the voltage difference.
When no pulling force and/or pressure is/are applied to the double-wishbone two-force rod, the resistance values of the four bridge arms of the full-bridge circuit are the same, so that the voltage of the second end of the first bridge arm 1 is the same as the voltage of the first end of the second bridge arm 2, that is, the voltage difference between the second end of the first bridge arm 1 and the first end of the second bridge arm 2 is zero; when tension and/or pressure are/is applied to the double-fork arm two-force rod, the resistance value of the strain gauge resistor is changed due to the deformation of the resistance wire, and therefore the voltage at the two ends of the first bridge arm and the voltage at the two ends of the second bridge arm are changed.
And 14, obtaining a strain-stress relation curve when the double-fork-arm two-force rod deforms according to the detected strain.
Specifically, step 14 includes:
acquiring strain corresponding to the pressure and/or pressure value by changing the pressure and/or pressure value applied to the double-fork-arm two-force rod to obtain multiple groups of stress and strain data;
and acquiring a strain-stress relation curve when the double-fork-arm two-force rod deforms according to the acquired multiple groups of stress and strain data, wherein the strain-stress relation is linear as shown in fig. 3.
It should be noted that, mounting holes are provided at the end portions of the first fork arm and the second fork arm of the dual-fork arm dual-force rod, and bolts can be inserted into the mounting holes to cooperate with corresponding equipment to apply tension and/or pressure to the dual-fork arm dual-force rod, and specifically, the equipment can change the magnitude of the applied force.
It should be further noted that, because the two fork arms of the two-fork-arm two-force lever are not arranged in parallel, therefore, when tensile force and/or pressure are/is applied, the two fork arms can generate bending deformation and tension-compression deformation, the bending deformation and the tension-compression deformation can both affect the resistance value of the strain gauge, further, the voltage value at the two ends of the resistance of the strain gauge is changed, in order to eliminate the influence of the bending deformation on the strain of the strain gauge, the embodiment of the invention, strain gauges are respectively arranged at the relative positions of the first fork arms, the strain gauges are respectively arranged at the relative positions of the second fork arms, when bending deformation occurs, the upper side of the single fork arm is tensile, and the upper side of the single fork arm is compressive, so that the generated strain is positive and negative, and the strain is just counteracted with each other, the strain signs generated by the tension and compression deformation of the two-force rod are the same and are positive or negative at the same time, and can not be mutually offset, therefore, the full-bridge circuit of the embodiment of the invention measures the strain generated by the tension and compression deformation of the two-force rod.
In order to obtain force data for road testing when the dual yoke two force bar is mounted to a vehicle, the method further comprises:
acquiring strain data of the double-fork-arm two-force rod in an actual road test of a vehicle;
and determining the stress data of the double-fork-arm two-force rod during the actual road test of the vehicle according to the strain data and the strain-stress relation curve.
Specifically, the step of determining stress data of the double-fork-arm two-force rod during the actual road test of the vehicle comprises the following steps:
calculating a stress and strain relation according to the strain data and the strain-stress relation curve;
and substituting the strain data into the relational expression of the stress and the strain to obtain the stress data of the double-fork-arm two-force rod during the actual road test of the vehicle.
While the preferred embodiments of the present invention have been described, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.
Claims (6)
1. A stress test method of a double-fork arm two-force rod is characterized by comprising the following steps:
respectively sticking strain gauges to the relative positions of the inner side and the outer side of a first fork arm of the double-fork-arm two-force rod, and respectively sticking the strain gauges to the relative positions of the inner side and the outer side of a second fork arm;
connecting the strain gauge on the first prong and the strain gauge on the second prong in series to form a full-bridge circuit;
exerting tension and/or pressure on the double-fork arm two-force rod, and detecting the strain of the strain gauge through the full-bridge circuit;
according to the detected strain, obtaining a strain-stress relation curve when the double-fork-arm two-force rod deforms;
wherein, carry out series connection with foil gage on the said first prong and foil gage on the said second prong, form the full bridge circuit: the method comprises the following steps:
connecting the strain gauges on the first fork arm in series to form a first bridge arm, and connecting the strain gauges on the second fork arm in series to form a second bridge arm;
connecting a first end of the first bridge arm with a first end of the second bridge arm, and connecting a second end of the first bridge arm with a second end of the second bridge arm to form a full-bridge circuit;
and a first resistor is also connected between the first end of the first bridge arm and the first end of the second bridge arm, and a second resistor is also connected between the second end of the first bridge arm and the second end of the second bridge arm.
2. The force testing method of claim 1, further comprising:
acquiring strain data of the double-fork-arm two-force rod in an actual road test of a vehicle;
and determining the stress data of the double-fork-arm two-force rod during the actual road test of the vehicle according to the strain data and the strain-stress relation curve.
3. The stress testing method according to claim 1, wherein the resistance of the first resistor, the resistance of the second resistor, the resistance of the strain gauge on the first bridge arm before deformation, and the resistance of the strain gauge on the second bridge arm before deformation are the same.
4. The stress testing method according to claim 1, wherein applying a tensile force and/or a compressive force on the double-wishbone two-force rod and detecting the strain of the strain gauge through the full-bridge circuit comprises:
inputting a constant voltage to a first end of the first bridge arm and a second end of the second bridge arm;
applying tension and/or pressure to the double-fork arm two-force rod, and detecting the voltage difference between the second end of the first bridge arm and the first end of the second bridge arm;
and calculating the strain of the strain gauge according to the voltage difference.
5. The stress testing method according to claim 1, wherein obtaining a strain-stress relationship curve when the bifurcate two-force lever deforms according to the detected strain comprises:
acquiring strain corresponding to the pressure and/or pressure value by changing the pressure and/or pressure value applied to the double-fork-arm two-force rod to obtain multiple groups of stress and strain data;
and acquiring a strain-stress relation curve when the double-fork-arm two-force rod deforms according to the acquired multiple groups of stress and strain data.
6. The stress testing method according to claim 2, wherein determining stress data of the double-fork-arm two-force lever during an actual road test of a vehicle according to the strain data and the strain-stress relationship curve comprises:
calculating a stress and strain relation according to the strain data and the strain-stress relation curve;
and substituting the strain data into the relational expression of the stress and the strain to obtain the stress data of the double-fork-arm two-force rod during the actual road test of the vehicle.
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| CN201910152095.1A CN111623909B (en) | 2019-02-28 | 2019-02-28 | Stress test method for double-fork-arm two-force rod |
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| CN201910152095.1A CN111623909B (en) | 2019-02-28 | 2019-02-28 | Stress test method for double-fork-arm two-force rod |
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| CN113504103A (en) * | 2021-07-27 | 2021-10-15 | 山南市市场监督管理局 | Method for detecting pressure-bearing performance of liquefied petroleum gas steel cylinder filling process under high altitude condition |
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