CN104849030A - Dynamic load testing device for connecting rod - Google Patents
Dynamic load testing device for connecting rod Download PDFInfo
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- CN104849030A CN104849030A CN201410799170.0A CN201410799170A CN104849030A CN 104849030 A CN104849030 A CN 104849030A CN 201410799170 A CN201410799170 A CN 201410799170A CN 104849030 A CN104849030 A CN 104849030A
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- connecting rod
- dynamic load
- proving installation
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- 238000012360 testing method Methods 0.000 title abstract description 22
- 239000011888 foil Substances 0.000 claims abstract description 17
- 238000009434 installation Methods 0.000 claims description 28
- 238000010586 diagram Methods 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000013461 design Methods 0.000 abstract description 11
- 238000004364 calculation method Methods 0.000 abstract description 8
- 238000004088 simulation Methods 0.000 abstract description 7
- 238000001228 spectrum Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Abstract
The invention relates to a dynamic load testing device for a connecting rod. The dynamic load testing device includes a foil gauge arranged on the to-be-tested connecting rod; and a data collecting unit arranged on the to-be-tested connecting rod and used for collecting strain signals sent by the foil gauge. Therefore, the working dynamic load of the connecting rod when an engine is working can be collected in real time, so that an accurate load spectrum can be provided for connecting rod design, connecting rod simulation calculation and fatigue reliability testing. Besides, the dynamic load testing device is simple in structure, high in precision and low in cost.
Description
Technical field
The present invention relates to vehicle testing technical field, be specifically related to a kind of connecting rod dynamic load proving installation.
Background technology
Connecting rod is one of critical piece of reciprocating-piston engine, when engine running works, connecting rod impacts except power except the gas in the jar bearing mechanical periodicity burns, also need to bear larger piston reciprocating and displacement generation inertial force, its safe reliability is directly connected to the life and reliability of engine complete machine, require that connecting rod must have enough intensity, rigidity, shock-resistant and certain toughness for this reason, the compact conformation of simultaneously trying one's best, lightweight.Therefore, the structural design of connecting rod, testing experiment and manufacture are the important process in engine development.In order to realize connecting rod high strength, light-weightedly pursue a goal, at present main adopt exploitation and adopt new material, improve manufacturing process, application of advanced design and simulation analytical technology optimizes the technical schemes such as the planform of connecting rod.
When materials and process one timing, the structural design of connecting rod, simulation analysis and testing experiment are the important contents of connecting rod development, wherein the calculating of connecting rod load and test to link design and emulation of crucial importance.The accuracy of connecting rod load is directly connected to result of calculation and project organization size and the quality of connecting rod emulation.The current method to determining connecting rod load, mainly by experimental formula computing method, namely calculates the effect to connecting rod by the quality, engine speed etc. of cylinder gaseous tension, piston and piston pin and connecting rod indirectly.
Mainly there is following shortcoming in the connecting rod load estimation algorithm of existing experimental formula: (1) can not understand real-time load, can not provide load accurately for simulation calculation and connecting rod fatigue life test; (2) precision is low, and error is large; (3) static load can only be estimated.Due to LOAD FOR and test inaccurate, often physical dimension is thick, heavy to cause link design, so cause that engine reciprocations quality is large, friction loss large, engine luggine and noise large; And quality of materials is large, manufacture processing cost high.Because connecting rod load test is inaccurate with calculating, connecting rod can be caused undersized, and cause connecting rod due to intensity, insufficient rigidity, connecting rod bearing worn, tile kilning, Bearing score, time serious, connecting rod fractures, and causes the major accident of fatal crass.Therefore existing connecting rod load test device and computing method can not meet the design of engine link, the requirement of reliability and lightweight etc. far away.
Summary of the invention
Technical matters to be solved by this invention is the problem that existing connecting rod load test device cannot measure load in real time.
For this purpose, the present invention proposes a kind of connecting rod dynamic load proving installation, comprising: foil gauge, be arranged on connecting rod to be measured; Data acquisition unit, is arranged on described connecting rod to be measured, for gathering the strain signal that described foil gauge sends.
Preferably, above-mentioned connecting rod dynamic load proving installation also comprises: be opened in the stress groove on described connecting rod to be measured, and described stress slot is near described foil gauge.
Preferably, above-mentioned connecting rod dynamic load proving installation also comprises: for the power supply of powering to described data acquisition unit, and described power supply and described data acquisition unit are separately positioned on the both sides in the middle part of described connecting rod to be measured.
Preferably, described foil gauge is arranged on the link feature point that is positioned in the middle part of described connecting rod to be measured.
Preferably, described data acquisition unit comprises: bridge diagram, for converting described strain signal to voltage signal; Filtering circuit, carries out filtering for the voltage signal sent described bridge diagram; Analog to digital conversion circuit, for being converted to digital signal by filtered voltage signal.
Preferably, described data acquisition unit also comprises: temperature-compensation circuit, carries out temperature compensation for the digital signal exported analog-digital conversion circuit as described.
Preferably, described bridge diagram is direct current wheatstone bridge structure.
Preferably, described filtering circuit is rc filter circuit.
Preferably, above-mentioned connecting rod dynamic load proving installation also comprises: storage unit, for storing the load data that described data acquisition unit gathers.
By adopting connecting rod dynamic load proving installation disclosed in this invention, can the trend of work load of Real-time Collection connecting rod when engine runs, thus can provide loading spectrum accurately for link design, connecting rod simulation calculation, Fatigue reliability testing, and structure is simple, precision is high and cost is low.
Accompanying drawing explanation
Can understanding the features and advantages of the present invention clearly by reference to accompanying drawing, accompanying drawing is schematic and should not be construed as and carry out any restriction to the present invention, in the accompanying drawings:
Figure 1A and 1B respectively illustrates front elevation according to the connecting rod dynamic load proving installation of the embodiment of the present invention and side view;
Fig. 2 shows the schematic diagram of the data acquisition unit according to the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the present invention is described in detail.
Figure 1A and 1B respectively illustrates front elevation according to the connecting rod dynamic load proving installation of the embodiment of the present invention and side view, as shown in Figure 1A and 1B, this connecting rod dynamic load proving installation comprises foil gauge 12 and data acquisition unit 13, wherein foil gauge 12 and data acquisition unit 13 are all arranged on connecting rod 11 to be measured, and data acquisition unit 13 is for gathering and storing the strain signal that foil gauge 12 sends.
Can the trend of work load of Real-time Collection connecting rod when engine runs by this connecting rod dynamic load proving installation, thus loading spectrum accurately can be provided for link design, connecting rod simulation calculation, Fatigue reliability testing.
Preferably, above-mentioned connecting rod dynamic load proving installation also comprises the stress groove 14 be opened on connecting rod 11 to be measured, and stress groove 14 is positioned near foil gauge 12, can increase the susceptibility of connecting rod test thus.
Preferably, above-mentioned connecting rod dynamic load proving installation also comprises the power supply 15 for powering to data acquisition unit 13, power supply 15 and data acquisition unit 13 can be separately positioned on the both sides in the middle part of connecting rod 11 to be measured, and epoxy resin etc. usually can be adopted to be pasted onto connecting rod 11 near middle to be measured.Those skilled in the art also can adopt the mode of encapsulation power supply 15 and data acquisition unit 13 to be fixed on connecting rod 11.Impact power and piston reciprocating and displacement produce inertial force because connecting rod needs to bear gas in the jar burning, therefore power supply 15 preferably adopts high temperature impact resistant battery, the supply voltage of data acquisition unit 13 can be 2.5V, in order to retain certain surplus, the output voltage of circuit can be 0.1V to 2.4V, selectes suitable gain resistor value according to load on connecting rod and ess-strain rough estimate value.Common test process, the connecting rod dynamic load proving installation working time, therefore the volume of battery was generally at 1cm below 1 hour
3below.
Preferably, in above-mentioned connecting rod dynamic load proving installation, foil gauge 12 can be arranged on the link feature point that is positioned in the middle part of connecting rod 11 to be measured by modes such as stickups, thus can gather the trend of work load of connecting rod when engine runs more accurately.
Fig. 2 shows the schematic diagram of the data acquisition unit according to the embodiment of the present invention, and as shown in Figure 2, this data acquisition unit comprises:
Bridge diagram 21, for converting strain signal to voltage signal, environment residing for data acquisition unit has very large acceleration and vibration, therefore whole bridge diagram should not adopt variable resistor, bridge resistor can consist of connection in series-parallel the fixed resistance of different resistance, in order to simplify circuit structure, direct current wheatstone bridge structure can be adopted;
Filtering circuit 22, carries out filtering for the voltage signal sent bridge diagram 21, to improve the signal to noise ratio (S/N ratio) of data acquisition unit, in order to reduce circuit volume, preferably adopts simple rc filter circuit;
Analog to digital conversion circuit 23, for being converted to digital signal by filtered voltage signal.
Environment temperature residing for foil gauge, in constantly change, in order to obtain measured value accurately, must carry out temperature compensation to foil gauge.But the locational space residing for sensor in connecting rod dynamic load proving installation and circuit board is little, in order to reduce the quantity of sensor as far as possible, conventional differential method cannot be adopted to carry out temperature compensation.Therefore, in the present embodiment, this data acquisition unit can also comprise temperature-compensation circuit 24, carries out temperature compensation for the digital signal exported analog to digital conversion circuit 23.Before test connecting rod is demarcated, with the relation curve of the stress-strain and temperature-strain that obtain same point position, can compensate the test error that temperature causes when calculating, thus obtain measurement result accurately.
Further, the connecting rod dynamic load proving installation according to the embodiment of the present invention also comprises storage unit, for storing gathered data.Preferably, storage unit is moveable.In order to make the data of storage more accurately and reliably, storage unit should be arranged independent of data acquisition unit, and the data gathered by data acquisition unit by wired or wireless connection transfer to outside storage unit.
Can real-time measurement connecting rod dynamic load in real engine running according to the connecting rod dynamic load proving installation of the embodiment of the present invention.Loading spectrum accurately can be provided for link design, connecting rod simulation calculation, Fatigue reliability testing, and there is Installation and Debugging convenience, precision is high, error is little, testing apparatus manufacture is simple, the feature that cost is low, reliable etc., filling up the blank in real engine connecting rod dynamic load measuring technology, having provided important measuring technology means for carrying out the designs such as connecting rod high strength, lightweight, low cost.
Although describe embodiments of the present invention by reference to the accompanying drawings, but those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, such amendment and modification all fall into by within claims limited range.
Claims (9)
1. a connecting rod dynamic load proving installation, is characterized in that, comprising:
Foil gauge, is arranged on connecting rod to be measured;
Data acquisition unit, is arranged on described connecting rod to be measured, for gathering the strain signal that described foil gauge sends.
2. connecting rod dynamic load proving installation according to claim 1, it is characterized in that, also comprise: be opened in the stress groove on described connecting rod to be measured, described stress slot is near described foil gauge.
3. connecting rod dynamic load proving installation according to claim 1, is characterized in that, also comprise: for the power supply of powering to described data acquisition unit, and described power supply and described data acquisition unit are separately positioned on the both sides in the middle part of described connecting rod to be measured.
4. connecting rod dynamic load proving installation according to claim 1, is characterized in that, described foil gauge is arranged on the link feature point that is positioned in the middle part of described connecting rod to be measured.
5. connecting rod dynamic load proving installation according to any one of claim 1 to 4, it is characterized in that, described data acquisition unit comprises:
Bridge diagram, for converting described strain signal to voltage signal;
Filtering circuit, carries out filtering for the voltage signal sent described bridge diagram;
Analog to digital conversion circuit, for being converted to digital signal by filtered voltage signal.
6. connecting rod dynamic load proving installation according to claim 5, it is characterized in that, described data acquisition unit also comprises:
Temperature-compensation circuit, carries out temperature compensation for the digital signal exported analog-digital conversion circuit as described.
7. connecting rod dynamic load proving installation according to claim 5, is characterized in that, described bridge diagram is direct current wheatstone bridge structure.
8. connecting rod dynamic load proving installation according to claim 5, it is characterized in that, described filtering circuit is rc filter circuit.
9. connecting rod dynamic load proving installation according to any one of claim 1 to 8, is characterized in that, also comprise:
Storage unit, for storing the load data that described data acquisition unit gathers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410799170.0A CN104849030B (en) | 2014-12-19 | 2014-12-19 | Connecting rod dynamic load test device for reciprocating-piston engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410799170.0A CN104849030B (en) | 2014-12-19 | 2014-12-19 | Connecting rod dynamic load test device for reciprocating-piston engine |
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| CN104849030A true CN104849030A (en) | 2015-08-19 |
| CN104849030B CN104849030B (en) | 2018-08-24 |
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| CN201410799170.0A Active CN104849030B (en) | 2014-12-19 | 2014-12-19 | Connecting rod dynamic load test device for reciprocating-piston engine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106555810A (en) * | 2015-09-30 | 2017-04-05 | 北汽福田汽车股份有限公司 | The system of the stress suffered by crankshaft arrangement and test bent axle |
| CN107202694A (en) * | 2017-06-26 | 2017-09-26 | 常州机电职业技术学院 | Fatigue durability testing device for engine connecting rod |
| CN109724862A (en) * | 2018-11-30 | 2019-05-07 | 中国船舶重工集团公司第七一一研究所 | Connecting rod stress test system and control method based on UWB |
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| CN107202694A (en) * | 2017-06-26 | 2017-09-26 | 常州机电职业技术学院 | Fatigue durability testing device for engine connecting rod |
| CN109724862A (en) * | 2018-11-30 | 2019-05-07 | 中国船舶重工集团公司第七一一研究所 | Connecting rod stress test system and control method based on UWB |
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| CN104849030B (en) | 2018-08-24 |
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Effective date of registration: 20180423 Address after: No. 188, Miyun District, Miyun District, Beijing, Beijing Applicant after: Beijing treasure Car Co.,Ltd. Address before: 102206 Changping District City, Shahe, Sha Yang Road, Beijing Applicant before: BEIQI FOTON MOTOR Co.,Ltd. |
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Denomination of invention: Connecting rod dynamic load test device for reciprocating piston engine Effective date of registration: 20211213 Granted publication date: 20180824 Pledgee: BEIJING AUTOMOTIVE GROUP Co.,Ltd. Pledgor: Beijing baowo Automobile Co.,Ltd. Registration number: Y2021990001167 |
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Date of cancellation: 20230925 Granted publication date: 20180824 Pledgee: BEIJING AUTOMOTIVE GROUP Co.,Ltd. Pledgor: Beijing baowo Automobile Co.,Ltd.|Borgward Automotive (China) Co., Ltd. Registration number: Y2021990001167 |
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Effective date of registration: 20240205 Address after: 102206, Beijing, Shahe, Changping District Town, Sha Yang Road, Lao Wan Village North Patentee after: BEIQI FOTON MOTOR Co.,Ltd. Country or region after: China Address before: No. 188, Miyun District, Miyun District, Beijing, Beijing Patentee before: Beijing baowo Automobile Co.,Ltd. Country or region before: China |