CN106855447B - The method of acquisition push rod stress and the in real time system of acquisition push rod stress in real time - Google Patents
The method of acquisition push rod stress and the in real time system of acquisition push rod stress in real time Download PDFInfo
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- CN106855447B CN106855447B CN201611227684.4A CN201611227684A CN106855447B CN 106855447 B CN106855447 B CN 106855447B CN 201611227684 A CN201611227684 A CN 201611227684A CN 106855447 B CN106855447 B CN 106855447B
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- push rod
- foil gauge
- gripping mechanism
- real
- stress
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0061—Force sensors associated with industrial machines or actuators
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/02—Gearings; Transmission mechanisms
- G01M13/027—Test-benches with force-applying means, e.g. loading of drive shafts along several directions
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/02—Details or accessories of testing apparatus
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- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The present invention provides the system and methods of real-time acquisition push rod stress, comprising: S1: configuring the full-bridge circuit being made of four foil gauges on each push rod in a pair of push rods being made of the first push rod and the second push rod, and the signal wire of the full-bridge circuit is led to data acquisition device along corresponding push rod；S2: configuration is configured by the first gripping mechanism of the first push rod clamping, also, on second push rod by the second gripping mechanism of the second push rod clamping on first push rod；First gripping mechanism: being connected by S3 by elastic component with second gripping mechanism, to prevent first push rod and second push rod from rotating under the action of the elastic component；S4: it in engine operation, acquires the strain signal of four foil gauges on the push rod in real time using real-time data acquisition device and calculates the real-time stress of the push rod.
Description
Technical field
The present invention relates to the detections to the push rod in engine valve actuating mechanism, and in particular to a kind of acquisition push rod stress in real time
Method and a kind of system of the push rod stress of acquisition in real time.
Background technique
In engine (such as diesel engine), push rod is the power biography that power is transmitted between valve lifter and valve rocker
Dynamic component, the stress condition of push rod directly affect the dynamic characteristics of engine valve actuating mechanism, thus in real time acquisition push rod by
Power is vital.
In the prior art, foil gauge is pasted usually on push rod to sense the stress of push rod, and by being attached thereto
The strain signal of acquisition is led to data acquisition device by strain signal line.However, push rod can produce in engine operation process
Raw rotation, as shown in Figure 1, this rotation can make strain signal line be wrapped on push rod simultaneously fracture failure.
In addition, in the prior art, temperature change also has very big influence to the strain signal of acquisition, and can make to measure
Stress value become unreliable.
Summary of the invention
Present invention aim to address drawbacks described above, especially prevent from fractureing because push rod rotates winding signal wire, and
The strain signal of foil gauge is reliably transmitted to data acquisition device by temperature change in real time.Above-mentioned purpose is by following technology
What scheme was realized.
The present invention provides a kind of methods of push rod stress of acquisition in real time, which comprises
S1: configuration is by four foil gauges on each push rod in a pair of push rods being made of the first push rod and the second push rod
The full-bridge circuit of composition, and the signal wire of the full-bridge circuit is led into data acquisition device along corresponding push rod；
S2: configuration is by the first gripping mechanism of the first push rod clamping on first push rod, also, described the
It configures on two push rods by the second gripping mechanism of the second push rod clamping；
S3: first gripping mechanism is connected with second gripping mechanism by elastic component, thus described
Prevent first push rod and second push rod from rotating under the action of elastic component；
S4: in engine operation, described four acquired in real time on the push rod using real-time data acquisition device are answered
Become the strain signal of piece and calculates the real-time stress of the push rod.
Further, pasted on the side of each push rod with the first foil gauge of push rod axis direction configured in parallel and
It directly mates the second foil gauge set with first foil gauge, also, pastes and push away on the opposite other side of each push rod
It the third foil gauge of rod axis direction configured in parallel and directly mates the 4th foil gauge set with the third foil gauge, in step
In S4, the data of strain signal are handled according to temperature-compensating formula (1):
Wherein, UBFor the voltage of the first foil gauge and the second foil gauge both ends, UAFor the second foil gauge and third foil gauge two
The voltage at end, υ are the Poisson's ratio of push rod material, and Ks is the strain rate of push rod material, εoFor push rod dependent variable.
Further, first gripping mechanism and second gripping mechanism are rigid clip.
Further, the elastic component is elastic ring.
The present invention also provides a kind of system of push rod stress of acquisition in real time, the system comprises:
The full-bridge circuit being made of four foil gauges, four foil gauges configuration is by the first push rod and the second push rod group
At a pair of push rods in each push rod on, also, from the full-bridge circuit draw signal wire drawn along corresponding push rod；
Data acquisition device, the data acquisition device acquire the strain signal exported by the signal wire；
First gripping mechanism and the second gripping mechanism, first gripping mechanism configuration is on first push rod and by institute
State the first push rod clamping, the second gripping mechanism configuration is on second push rod and by the second push rod clamping；
First gripping mechanism is connected by elastic component, the elastic component with second gripping mechanism, thus
Prevent first push rod and second push rod from rotating under the action of the elastic component；
Wherein when engine is run, the data acquisition device acquires four foil gauges on the push rod in real time
Strain signal, and calculate the real-time stress of the push rod.
Further, be pasted on the side of each push rod with the first foil gauge of push rod axis direction configured in parallel with
And it directly mates the second foil gauge set with first foil gauge, also, be pasted on the opposite other side of each push rod
It directly mates the 4th foil gauge set with the third foil gauge of push rod axis direction configured in parallel and with the third foil gauge.
Further, first gripping mechanism and second gripping mechanism are rigid clip.
Further, the elastic component is elastic ring.
The present invention has the advantages that
The present invention solves the problems, such as real-time testing push rod stress condition in engine operation process, particularly, the present invention
The flexible frock for solving push rod Rotation in engine operation process is provided, also, solves push rod in the case of a high temperature,
Ess-strain temperature drift problems are supported so as to provide reliable data for design.In addition, the present invention can be prevented because pushing away
Bar rotates and strain signal line is made to fracture, and the strain signal of push rod is exported to data acquisition device.Method of the invention and it is
It unites simple and efficient to handle, stable output signal.
Detailed description of the invention
By reading the following detailed description of the preferred embodiment, various other advantages and benefits are common for this field
Technical staff will become clear.The drawings are only for the purpose of illustrating a preferred embodiment, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings:
Fig. 1 is the valve actuating mechanism of engine in the prior art；
Fig. 2 is the schematic diagram of the system of real-time acquisition push rod stress of the invention；
Fig. 3 is the schematic illustration of real-time acquisition push rod stress of the invention；
Fig. 4 a is the location diagram on push rod of four foil gauges of the invention；
Fig. 4 b is full-bridge circuit schematic diagram, wherein R1It is the resistance of foil gauge 1, R2It is the resistance of foil gauge 2, R3It is strain
The resistance of piece 3, R4It is the resistance of foil gauge 4.
Specific embodiment
The illustrative embodiments of the disclosure are more fully described below with reference to accompanying drawings.Although showing this public affairs in attached drawing
The illustrative embodiments opened, it being understood, however, that may be realized in various forms the disclosure without the reality that should be illustrated here
The mode of applying is limited.It is to be able to thoroughly understand the disclosure on the contrary, providing these embodiments, and can be by this public affairs
The range opened is fully disclosed to those skilled in the art.
As shown in Figures 2 and 3, the present invention provides a kind of system of push rod stress of acquisition in real time, which includes: by four
A foil gauge 4 (illustrates only two foil gauges positioned at side, but on the other side of the push rod on each push rod 5 in Fig. 1
Also is provided with two foil gauges) constitute full-bridge circuit, data acquisition device (as shown in Figure 3), the first, second gripping mechanism (its
For example, rigid clip) 2 and elastic component (it is, for example, elastic ring) 3, four configurations of foil gauges 4 are by 5 He of the first push rod
On each push rod in a pair of push rods of second push rod 6 composition, also, the signal wire drawn from full-bridge circuit along pushing away accordingly
Bar is drawn.Data acquisition device acquires the signal exported by signal wire, as shown in Figure 3.The configuration of first gripping mechanism 2 is pushed away first
On bar 5 and by 5 clamping of the first push rod, the configuration of the second gripping mechanism 2 is on the second push rod 6 and by 6 clamping of the second push rod.Elastic structure
First gripping mechanism 2 is connected by part 3 with second gripping mechanism 2, to prevent first to push away under the action of elastic component 3
Bar 5 and the rotation of the second push rod 6.In engine operation, data acquisition device acquires answering for four foil gauges 4 on push rod in real time
Varying signal, and calculate the real-time stress of push rod.
Specifically, as shown in fig. 4 a, with push rod axis direction configured in parallel is pasted on the side of each push rod
One foil gauge (that is, foil gauge 1) and the second foil gauge (that is, foil gauge 2) set that directly mates with first foil gauge, and
And it is pasted on the opposite other side of each push rod with the third foil gauge of push rod axis direction configured in parallel (that is, strain
Piece 3) and the 4th foil gauge (that is, foil gauge 4) set that directly mates with the third foil gauge, wherein corresponding full-bridge circuit
As shown in Figure 4 b, wherein R1It is the resistance of foil gauge 1, R2It is the resistance of foil gauge 2, R3It is the resistance of foil gauge 3, R4It is strain
The resistance of piece 4.
In addition, the signal harness 1 in Fig. 1 is actually four leads being bundled together, the tie point of every lead is as schemed
Shown in 4b.
The method that real-time acquisition push rod stress according to the present invention is described presently in connection with Fig. 2, Fig. 3, Fig. 4 a, Fig. 4 b, should
Method includes:
S1: configuration is strained by four on each push rod in a pair of push rods being made of the first push rod 5 and the second push rod 6
The full-bridge circuit that piece 4 is constituted, and the signal wire of full-bridge circuit (such as harness 1) is led into data along corresponding push rod and is adopted
Acquisition means；
S2: it configures on the first push rod 5 by the first gripping mechanism 2 of 5 clamping of the first push rod, also, on the second push rod 6
It configures the second gripping mechanism 2 of 6 clamping of the second push rod；
S3: first gripping mechanism is connected with the second gripping mechanism by elastic component 3, thus in elastic component 3
Prevent the first push rod 5 and the second push rod 6 from rotating under effect；
S4: in engine operation, answering for four foil gauges on push rod is acquired in real time using real-time data acquisition device
Varying signal and the real-time stress (such as pulling force F) for calculating push rod.
In addition, in step s 4, being handled according to temperature-compensating formula (1) the data of strain signal:
Wherein, UBFor voltage (third foil gauge and the 4th strain in other words of the first foil gauge and the second foil gauge both ends
The voltage at piece both ends), UAFor voltage (the first foil gauge and the 4th strain in other words of the second foil gauge and third foil gauge both ends
The voltage at piece both ends), υ is the Poisson's ratio of push rod material, and Ks is the strain rate of push rod material, εoFor push rod dependent variable.
According to the present invention, in engine operation process, push rod generates rotation in order to prevent, by with rigid clip by bullet
Property circle and push rod be fixed on specific position (avoid and engine other parts interfere), foil gauge and signal wire are viscous by design requirement
It is labelled to corresponding position, the resistance that elastic ring generates in engine operation process can guarantee that push rod is existing without spin (such as rotation)
As preventing strain signal line to be wrapped in fracture failure on push rod, ensure that strain signal is reliably transmitted to data acquisition in real time
In device, and strain signal data are handled according to temperature-compensating formula (1), the temperature for eliminating conducting wire influences, and measures
Data really reflect push rod real-time stress situation.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of the claim
Subject to enclosing.
Claims (8)
1. a kind of method of the push rod stress of acquisition in real time, which is characterized in that the described method includes:
S1: it configures on each push rod in a pair of push rods being made of the first push rod and the second push rod and is made of four foil gauges
Full-bridge circuit, and the signal wire of the full-bridge circuit is led into data acquisition device along corresponding push rod；
S2: it configures on first push rod and is pushed away by the first gripping mechanism of the first push rod clamping, also, described second
It configures on bar by the second gripping mechanism of the second push rod clamping；
S3: first gripping mechanism is connected with second gripping mechanism by elastic component, thus in the elasticity
Prevent first push rod and second push rod from rotating under the action of component；
S4: in engine operation, four foil gauges on the push rod are acquired in real time using the data acquisition device
Strain signal and calculate the real-time stress of the push rod.
2. the method for real-time acquisition push rod stress according to claim 1, which is characterized in that on the side of each push rod
It pastes and the first foil gauge of push rod axis direction configured in parallel and the second strain set that directly mates with first foil gauge
Piece, also, paste on the opposite other side of each push rod with the third foil gauge of push rod axis direction configured in parallel and
It directly mates the 4th foil gauge set with the third foil gauge, in step s 4, according to temperature-compensating formula (1) to strain signal
Data handled:
Wherein, UBFor the voltage of the first foil gauge and the second foil gauge both ends, UAFor the second foil gauge and third foil gauge both ends
Voltage, υ are the Poisson's ratio of push rod material, and Ks is the strain rate of push rod material, εoFor push rod dependent variable.
3. the method for real-time acquisition push rod stress according to claim 1 or 2, which is characterized in that the first clamping dress
Setting with second gripping mechanism is rigid clip.
4. the method for real-time acquisition push rod stress according to claim 1 or 2, which is characterized in that the elastic component is
Elastic ring.
5. a kind of system of the push rod stress of acquisition in real time, which is characterized in that the system comprises:
The full-bridge circuit being made of four foil gauges, four foil gauges configurations are being made of the first push rod and the second push rod
On each push rod in a pair of push rods, also, drawn from the signal wire that the full-bridge circuit is drawn along corresponding push rod；
Data acquisition device, the data acquisition device acquire the strain signal exported by the signal wire；
First gripping mechanism and the second gripping mechanism, first gripping mechanism configuration is on first push rod and by described the
One push rod clamping, second gripping mechanism configuration is on second push rod and by the second push rod clamping；
Elastic component, first gripping mechanism is connected by the elastic component with second gripping mechanism, thus in institute
Stating prevents under the action of elastic component first push rod and second push rod from rotating,
Wherein when engine is run, the data acquisition device acquires answering for four foil gauges on the push rod in real time
Varying signal, and calculate the real-time stress of the push rod.
6. the system of real-time acquisition push rod stress according to claim 5, which is characterized in that on the side of each push rod
It is pasted with the first foil gauge of push rod axis direction configured in parallel and is answered with first foil gauge, second set that directly mate
Become piece, also, is pasted with the third foil gauge with push rod axis direction configured in parallel on the opposite other side of each push rod
And it directly mates the 4th foil gauge set with the third foil gauge.
7. the system of real-time acquisition push rod stress according to claim 5 or 6, which is characterized in that the first clamping dress
Setting with second gripping mechanism is rigid clip.
8. the system of real-time acquisition push rod stress according to claim 5 or 6, which is characterized in that the elastic component is
Elastic ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611227684.4A CN106855447B (en) | 2016-12-27 | 2016-12-27 | The method of acquisition push rod stress and the in real time system of acquisition push rod stress in real time |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611227684.4A CN106855447B (en) | 2016-12-27 | 2016-12-27 | The method of acquisition push rod stress and the in real time system of acquisition push rod stress in real time |
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| CN106855447A CN106855447A (en) | 2017-06-16 |
| CN106855447B true CN106855447B (en) | 2019-05-28 |
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| WO2023133209A1 (en) * | 2022-01-05 | 2023-07-13 | Avco Corporation | Valvetrain testing using instrumented pushrod |
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|---|---|---|---|---|
| JP2002131176A (en) * | 2000-10-24 | 2002-05-09 | Tadashi Shigemi | Impact buckling test apparatus |
| CN102620925A (en) * | 2012-04-12 | 2012-08-01 | 杭州电子科技大学 | Device and method for measurement testing of load of valve rocker of engine valve mechanism |
| CN105223004A (en) * | 2014-07-02 | 2016-01-06 | 西安航空动力股份有限公司 | Air bleed valve tappet hierarchical loading fatigue strength contrast test method |
| CN105241590A (en) * | 2015-10-19 | 2016-01-13 | 西安航空动力股份有限公司 | Method for testing dynamic stress of rocker arm of air bleeding band under running state, and strain gauge fixing device |
| CN105910811A (en) * | 2016-06-01 | 2016-08-31 | 华南理工大学 | Cam tappet wearing test device |
-
2016
- 2016-12-27 CN CN201611227684.4A patent/CN106855447B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002131176A (en) * | 2000-10-24 | 2002-05-09 | Tadashi Shigemi | Impact buckling test apparatus |
| CN102620925A (en) * | 2012-04-12 | 2012-08-01 | 杭州电子科技大学 | Device and method for measurement testing of load of valve rocker of engine valve mechanism |
| CN105223004A (en) * | 2014-07-02 | 2016-01-06 | 西安航空动力股份有限公司 | Air bleed valve tappet hierarchical loading fatigue strength contrast test method |
| CN105241590A (en) * | 2015-10-19 | 2016-01-13 | 西安航空动力股份有限公司 | Method for testing dynamic stress of rocker arm of air bleeding band under running state, and strain gauge fixing device |
| CN105910811A (en) * | 2016-06-01 | 2016-08-31 | 华南理工大学 | Cam tappet wearing test device |
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