CN202066577U - Vehicle dynamic weighting sensing device - Google Patents
Vehicle dynamic weighting sensing device Download PDFInfo
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- CN202066577U CN202066577U CN2011201007211U CN201120100721U CN202066577U CN 202066577 U CN202066577 U CN 202066577U CN 2011201007211 U CN2011201007211 U CN 2011201007211U CN 201120100721 U CN201120100721 U CN 201120100721U CN 202066577 U CN202066577 U CN 202066577U
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- load plate
- optical fiber
- distributed optical
- strain
- test section
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- 238000012360 testing method Methods 0.000 claims abstract description 57
- 239000013307 optical fiber Substances 0.000 claims abstract description 38
- 238000005303 weighing Methods 0.000 claims abstract description 28
- 239000000853 adhesive Substances 0.000 claims abstract description 7
- 230000001070 adhesive effect Effects 0.000 claims abstract description 7
- 239000000835 fiber Substances 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 4
- 230000010354 integration Effects 0.000 abstract description 4
- 230000035772 mutation Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
本实用新型为一种车辆动态称重传感装置，包括长宽比大于2：1的长方形载荷板，在所述载荷板下表面间隔刻有多条凹槽，载荷板的下表面设置有与凹槽相垂直的整根通长的分布式光纤，所述分布式光纤两端分别为入射端和出射端；载荷板下表面设置的测试区敷设有将分布式光纤包裹住的高强度粘合剂，分布式光纤的测试段分布于测试区内，分布式光纤的非测试段位于载荷板的两端。本实用新型利用分布式光纤对载荷板底部的应变进行测量并输出，由应变输出得到作用于板上部的车辆重量，达到实时动态测试的效果，具有精度高、集成度高、抗电磁干扰能力强、工作性能稳定、造价低廉、易于产品化等优点。
The utility model relates to a dynamic weighing sensor device for a vehicle, comprising a rectangular load plate with an aspect ratio greater than 2:1, a plurality of grooves are engraved on the lower surface of the load plate at intervals, and the lower surface of the load plate is provided with The entire length of the distributed optical fiber perpendicular to the groove, the two ends of the distributed optical fiber are the incident end and the outgoing end; the test area set on the lower surface of the load plate is laid with a high-strength adhesive that wraps the distributed optical fiber The test section of the distributed optical fiber is distributed in the test area, and the non-test section of the distributed optical fiber is located at both ends of the load plate. The utility model uses distributed optical fibers to measure and output the strain at the bottom of the load plate, and the weight of the vehicle acting on the upper part of the plate is obtained from the strain output, so as to achieve the effect of real-time dynamic testing, and has high precision, high integration, and strong anti-electromagnetic interference ability , stable working performance, low cost, easy productization and other advantages.
Description
Technical field
The utility model relates to a kind of weighing sensing device, is specifically related to a kind of vehicle dynamic weighing sensing device.
Background technology
Dynamic weighing system is the advanced subject of international scientific research field at present, and the development and application of Dynamic Weighing Technology is all paid attention in countries in the world very much.Since the fifties, developed country just begins the automobile dynamically weighing system is studied from eighties of last century, and has obtained corresponding achievement.From the dynamic weighing system of successful Application in the market, the automobile dynamically weighing system mainly contains according to principle: piezoelectric type, condenser type, weighing platform formula, to shear beam type and bended plate type etc. several, wherein being most widely used with bended plate type and piezoelectric type.
Wherein, the piezoelectric type dynamic weighing system is worked for the piezoelectric effect principle of utilizing piezoelectric, owing to be nonisulated body, very big to the electric signal interference, and be easy to make moist; Simultaneously, its serviceability instability, durability of structures is relatively poor.And the bended plate type dynamic weighing system utilizes strain transducer that the bottom strain of sheet metal is measured, and calculates the dynamic weight value by the strain of system output, that this system has is simple in structure, be can stablize, advantage such as good endurance.Because the strain transducer that traditional bended plate type dynamic weighing system adopts is a resistance strain plate, be subjected to electromagnetic interference (EMI) easily and produce and can produce drift in distorted signals, the long-term use and creep etc., can't satisfy the requirement of dynamic weighing.Part scholar and researchist adopt fiber grating to be used for testing the strain of bent plate bottom as strain transducer at present, though precision height, good endurance, anti-electromagnetic interference capability are strong, but fiber grating can't be realized distributed strain and measure, the precision of strain output is limited, if by intensive arranged light fiber grating sensor, then cost is higher, can't wide popularization and application.
The utility model content
The utility model purpose: the purpose of this utility model provides a kind of dynamic weighing sensor that can accurately measure the vehicle weight in travelling.
Technical scheme:
A kind of vehicle dynamic weighing sensing device, comprise the rectangle load plate of length breadth ratio greater than 2:1, be carved with many grooves at interval at described load plate lower surface, the lower surface of load plate is provided with the whole piece elongated distribution type fiber-optic perpendicular with groove, and described distribution type fiber-optic two ends are respectively incident end and exit end; The test section of load plate lower surface setting is laid with the high-strength structureal adhesives that distribution type fiber-optic is wrapped, and the test section of distribution type fiber-optic is distributed in the test section, and the non-test section of distribution type fiber-optic is positioned at the two ends of load plate.
Described groove can be the lower surface that laterally is engraved in load plate, also can be the lower surface that vertically is engraved in load plate.
As a kind of implementation of the present utility model, described distribution type fiber-optic is arranged on the lower surface of load plate back and forth.
As a kind of simple in structure, implementation that cost is low of the utility model, described groove laterally is engraved in the lower surface of load plate, and described distribution type fiber-optic is along the single setting of lower surface longitudinal midline of load plate; The two ends that the incident end at described distribution type fiber-optic two ends and exit end lay respectively at load plate.
Vertical angle deviation≤5 of described distribution type fiber-optic and groove °.
The spacing 5cm of described groove-20cm, the degree of depth 1 cm-2.5 cm, width 1 cm-3 cm, described non-test section width 〉=5 cm.
Described high-strength structureal adhesives can adopt polyester glue, epoxide-resin glue etc.
For the ease of the laying and improve installation accuracy of distribution type fiber-optic, can be in groove filling flexible packing material, for example polyethylene foamed etc.Flexible packing material is closely knit be filled in the groove and with the levelling of load plate lower surface, like this distribution type fiber-optic when laying with regard to not yielding dislocation.
The utility model is installed the load plate lower surface down when mounted, and the load plate upper surface is concordant with the road surface.The utility model is to utilize the distribution type fiber-optic that is arranged at the load plate bottom to obtain vehicle through out-of-date bent plate bottom centre's line strain output or whole audience strain output, by the linear relationship between strain output at the bottom of car weight and the plate and the road speed product, the weight when recording vehicle '.The pattern of transverse belt groove is processed in load plate bottom surface, increases the relative deformation of vehicle at the bottom of out-of-date plate, amplify the strain of the distribution type fiber-optic that sticks on the bottom, satisfy the needs of distributive fiber optic strain measuring accuracy.Adopt high-strength structureal adhesives to be pasted on the load plate lower surface distribution type fiber-optic, can guarantee no relative slippage between optical fiber and the load plate.
According to classical Plate Mechanics: when the field limit boundary condition symmetry and the length breadth ratio of long slab
The time, as not considering the singular point effect, then in the unlimited zone of long slab away from the end, the strain that load produces in plate is only relevant with the load size, and irrelevant with the active position and the distribution form of load.According to this principle, when vehicle at the uniform velocity passes through sensor:
When (1) strain on can only obtaining long limit center line was exported, the output of sensor dynamic strain was only relevant with total load (TL) and speed, and is irrelevant with the length and the distribution of load.Enough when the bent plate sensor length, the wheel load position is enough apart from bent plate end distance, and wheel load is so that at the uniform velocity v is by the bent plate sensor, and the dynamic weighing formula is:
P=S·v/S
o （1）
In the formula, the load of P-wheel, the speed of v-vehicle ', S-sensor dynamic strain output, S
0-constant can obtain by on-site proving.
(2) when obtaining full-field distribution formula strain when output, the output of sensor dynamic strain is only relevant with total load (TL), and irrelevant with the travel speed of length, distribution and the vehicle of load.Enough when the bent plate sensor length, the wheel load position is enough apart from bent plate end distance, and the dynamic weighing formula is:
P=S/?S
0 （2）
In the formula, the load of P-wheel, S-sensor dynamic strain output, S
0-constant can obtain by on-site proving.
Adopt distribution type fiber-optic to measure the Strain Distribution of load plate bottom surface, the strain that can obtain sensor by integration method is exported, and then obtains wheel load by formula (1), (2), is obtained the weight of vehicle axle weight, car load by each wheel load summation that records.When the temperature in the somewhere of optical fiber, when strain changes, corresponding skew can take place in the back frequency to Brillouin's spectrum at random in the optical fiber, and the side-play amount of frequency becomes good linear relationship with fibre strain, temperature variable.Test optical fiber section any point
When strain, temperature took place at the place, test section, non-test section Brillouin are at random, and the light frequency side-play amount was respectively:
v
B,t(z)=v
B,t 0(z)+c
1·△ε
t(z)+c
2·△T
t(z) （3）
v
B?(z
’)=v
B 0(z
’)+c
1·△ε(z
’)+c
2·△T
t(z
’) （4）
In the formula: v
B, t(z)-test section
The frequency shift (FS) of Brillouin light after some generation strain or the temperature variation;
v
B, t 0(z)-test section
The initial frequency drift of some place Brillouin light;
v
B(z
')-non-test section
The frequency shift (FS) of some place Brillouin light
v
B 0(z
')-non-test section
The initial frequency drift of some place Brillouin light;
△ ε
t(z)-the test section fiber optic point
Place's axis strain variation;
△ ε (z
')-non-test section fiber optic point
Place's axis strain variation,
△ T
t(z)-variation of test section fiber optic temperature;
△ T (z
')-non-test section fiber optic temperature changes;
c
1, c
2The coefficient of strain of the frequency shift (FS) of-Brillouin light and temperature coefficient.
As temperature compensation optical fiber, obtain Brillouin's frequency side-play amount that the test section strain causes after the frequency offset of the optical fiber of test section and non-test section subtracted each other, that is: with the non-test section optical fiber at the bottom of the plate
v
B,t(z)-v
B?(z
’)=[v
B,t 0(z)-v
B 0(z
’)]+?c
1·?[△ε(z)-△ε(z
’)]+?c
2·[△T
t(z)-△T
t(z
’)] (5)
Make v
B, t(z)-v
B(z
')=△ v
B, t(z), v
B, t 0(z)-v
B 0(z
')=△ v
B, t 0(z), △ T
t(z)-△ T (z
,)=△ T
t ,(z), △ ε
t(z)-△ ε (z
')=△ ε
t ,(z), then (5) formula becomes:
△v
B,t(z)=△v
B,t 0(z)+?c
1·△ε
t ，(z)+?c
2·△T
t ，（z) （6）
Because test section equates with non-test section fiber optic temperature, i.e. △ T
t(z)-△ T
t(z
')=△ T
t ,(z)=0; Simultaneously, non-test section optical fiber zero axial strain, i.e. △ ε
t(z)-△ ε (z
')=△ ε
t ,(z)=△ ε
t(z)
Then formula (6) becomes:
△v
B,t(z)=△v
B,t 0(z)+?c
1·△ε
t(z) （7）
Shifting to abbreviation gets: △ ε
t(z)=[△ v
B, t(z)-△ v
B, t 0(z)]/c
1(8)
In the formula: v
B, t(0)-test section
The initial frequency drift of some place Brillouin light;
v
B, t(z)-test section
The frequency shift (FS) of Brillouin light after some generation strain or the temperature variation;
c
1, c
2The coefficient of strain of the frequency shift (FS) of-Brillouin light and temperature coefficient
△ ε
t(z)-test section z point place shaft axis of optic fibre strain variation;
△ T
t(z)-variation of test section z point place fiber optic temperature.
The position Z that strain or temperature variation take place in the optical fiber can be determined by following formula:
Z=c·T/(2n) （9）
In the formula: the position of Z-generation strain or temperature variation is apart from the distance of starting point;
The light velocity in c-vacuum;
T-transmission pulsed light connects the mistiming that is subjected to light at random;
The flexion rate of n-optical fiber.
Then the output of the strain at the bottom of the plate can be obtained by the integration of each test point:
S=∫
z∈Z △ε(z) （10）
In the formula: Z-limit of integration is test section optical fiber length overall.
Utilize formula (1), (2) can calculate vehicle, heavy, the complete vehicle weight of the axle that obtains vehicle after adding up through the out-of-date wheel load that acts on the load plate.
The utility model is staggered front to back the right and left that is arranged in the track center line with two vehicle dynamic weighing sensing devices in use, utilizes wheel to arrive the mistiming, sensor of two sensors distance in vehicle forward direction, tries to achieve the travel speed of vehicle; Utilize front and back wheel to reach the mistiming of same sensor and the travel speed that records, try to achieve the wheelbase of vehicle.
Beneficial effect: utilize distribution type fiber-optic that the strain of load plate bottom is measured and exported, obtain acting on the vehicle weight on plate top by strain output, reach the effect of Real-time and Dynamic test, have that precision height, integrated level height, anti-electromagnetic interference capability are strong, stable work in work, cheap, be easy to advantage such as commercialization.
Description of drawings
Fig. 1 is the structural representation of the utility model embodiment 1, and Fig. 2 is the structural representation of embodiment 2, and Fig. 3 is the structural representation of embodiment 3.
Fig. 4 is that distribution type fiber-optic is provided with synoptic diagram among the utility model embodiment 1 on load plate, Fig. 5 is that distribution type fiber-optic is provided with synoptic diagram among the utility model embodiment 2 on load plate, and Fig. 6 is that distribution type fiber-optic is provided with synoptic diagram among the utility model embodiment 3 on load plate.
Fig. 7 is that the utility model sensor lays position view on the road surface.
Have among the figure: load plate 1, distribution type fiber-optic 3, incident end 31, exit end 32, test optical fiber section 33, the non-test section 34 of optical fiber, high-strength adhesive 4, groove 5, test section 6, load plate lower surface 7, load plate upper surface 8.
Embodiment
Below in conjunction with accompanying drawing the technical solution of the utility model is elaborated.
Among the embodiment 1, as shown in Figure 1 and Figure 4, comprise the rectangle load plate 1 of length breadth ratio greater than 2:1, be carved with many transverse concave grooves 5 at interval at load plate 1 lower surface, the lower surface of load plate 1 is provided with whole elongated distribution type fiber-optic 3 that is provided with back and forth, distribution type fiber-optic 3 and groove 5 perpendicular settings, distribution type fiber-optic 3 two ends are respectively incident end 31 and exit end 32.The test section 6 of load plate 1 lower surface is laid with the high-strength structureal adhesives 4 that distribution type fiber-optic 3 is wrapped, and the test section 33 of distribution type fiber-optic is distributed in this zone, and the non-test section 34 of distribution type fiber-optic is positioned at the two ends of load plate 1.Non-test section 34 can be all to be provided with at the two ends of load plate, also can be only at one end to be provided with.
Among the embodiment 2, as Fig. 2 and shown in Figure 5, described load plate 1 lower surface is carved with many longitudinal flutings 5 at interval, and corresponding, the direction that is provided with of distribution type fiber-optic 3 also changes, and all the other are with embodiment 1.
Among the embodiment 3, as Fig. 3 and shown in Figure 6, its structure is similar with embodiment 1, and different is, distribution type fiber-optic 3 is along the single setting of lower surface longitudinal midline of load plate 1, and the incident end 31 of distribution type fiber-optic 3 and exit end 32 lay respectively at the two ends of load plate 1.
Vertical angle deviation≤5 of distribution type fiber-optic and groove °.The spacing 5cm of groove-20cm, the degree of depth 1 cm-2.5 cm, width 1 cm-3 cm, non-test section width 〉=5 cm.
Vehicle dynamic weighing sensing device of the present utility model is mounted to the monitoring lane position, and the load plate lower surface is installed down, load plate upper surface and road surface levelling.Vehicle ' is through sensor, and stretching strain takes place at the bottom of loading plate 1 plate in loading plate 1 bending.Because of groove section rigidity at the bottom of the plate weakens, loading plate 1 recess edge relative deformation increases, and these position measurement section optical fiber 33 axial strains increase, and increases the test optical fiber susceptibility, improves the dynamic test precision.
As shown in FIG., the generating laser emitted laser enters test section optical fiber 33 by incident end 31.Through out-of-date, axis deformation takes place to vehicle in test section optical fiber 33, causes the back of test section optical fiber 33 to be offset to Brillouin's spectrum at random with speed v.Obtain the power of the continuous light of test section optical fiber 33 and non-test section 34 reflected backs, obtain their optical frequency offset amount respectively, substitution formula 8,9 obtains the axial strain and the distribution of test section optical fiber 33, and then obtains strain output S by formula 10, obtains vehicle wheel load P by formula 1 or 2.
One group of two sensor is mounted on the monitoring track by position shown in Figure 7, can realizes automobile axle load, complete vehicle weight, time of arrival, travel speed, the isoparametric measurement of wheelbase.With the diaxon four-wheel automobile is example, and behind the wheel load of each wheel, it is heavy that the forward and backward wheel load that adds up respectively promptly obtains the forward and backward axle of automobile under the monitoring record, and each axle recuperation that adds up is to complete vehicle weight.The time t that fibre strain was undergone mutation when the off-front wheel of meter automobile arrived the sensor on right side, track
1, the time t that fibre strain was undergone mutation when off hind wheel arrived the sensor on right side, track
2, the time t that optical fiber was undergone mutation when the near front wheel arrived the sensor on right side, track
1 ,, the time t that optical fiber was undergone mutation when a left side arrived the sensor on right side, track
2 ,Between the known sensor along vehicle traveling direction apart from s, automobile driving speed then: v=s/ (t
1 ,-t
1) or v=s/ (t
2 ,-t
2); The wheelbase of automobile is d=v (t
2-t
1) or d=v (t
2 ,-t
1 ,).
Claims (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201007211U CN202066577U (en) | 2011-04-08 | 2011-04-08 | Vehicle dynamic weighting sensing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201007211U CN202066577U (en) | 2011-04-08 | 2011-04-08 | Vehicle dynamic weighting sensing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202066577U true CN202066577U (en) | 2011-12-07 |
Family
ID=45060438
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201007211U Expired - Fee Related CN202066577U (en) | 2011-04-08 | 2011-04-08 | Vehicle dynamic weighting sensing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202066577U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102155974A (en) * | 2011-04-08 | 2011-08-17 | 东南大学 | Dynamic weighing sensor for vehicles |
-
2011
- 2011-04-08 CN CN2011201007211U patent/CN202066577U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102155974A (en) * | 2011-04-08 | 2011-08-17 | 东南大学 | Dynamic weighing sensor for vehicles |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111207 Termination date: 20120408 |