CN103473948A - Piezoelectric cable layout structure and overloaded vehicle wheel line horizontal position identification method - Google Patents

Abstract

The invention discloses a piezoelectric cable layout structure and an overload vehicle wheel line horizontal position identification method. The piezoelectric cable layout structure and the overloaded vehicle wheel line horizontal position identification method are characterized in that piezoelectric cables form a Z-shaped structure on a road or bridge road surface where vehicles travel, a first piezoelectric cable and a third piezoelectric cable of the Z-shaped structure are perpendicular to the driveway direction, and stretch over the left half driveway and the right half driveway respectively one after the other in the driving direction of the vehicles. The distance between the first piezoelectric cable and the third piezoelectric cable is L1, and L1 is not equal to zero. An inclined angle theta is formed between a second piezoelectric cable and the first piezoelectric cable, theta is not equal to zero, the second piezoelectric cable and the first piezoelectric cable intersect at the left side line of the road, and the second piezoelectric cable and the third piezoelectric cable intersect at the right side line of the road. The piezoelectric cable layout structure and the overload vehicle wheel line horizontal position identification method obtain the weight and the axle load of an overloaded vehicle and can identify the horizontal position of the wheel line of the overloaded vehicle on the driveway at the same time.

Description

Piezoelectric cable laying structure and the trace lateral attitude recognition methods of overloaded vehicle wheel

Technical field

The present invention relates to the bridge monitoring technical field, the specifically recognition methods of a kind of overloaded vehicle wheel trace lateral attitude, the lateral attitude identification of overload car during for the highway bridge Vehicle Driving Cycle.

Background technology

The highway bridge steel bridge deck directly bears the effect of wheel load, and many have the current steel bridge deck of heavy traffic load the fatigue damage phenomenon in succession to occur after using several years or more than ten years.Result of study shows, the stress amplitude that the fatigue lifetime of steel bridge deck and wheel load produce and effect number of times have very large relation, for bridge, are not only overload of vehicle, and the impact on bridge is also very large in Zhong lateral attitude, track for vehicle.The bridge collapse event recurred in recent years, with overload and its lateral attitude on bridge by vehicle on bridge, very large relation is arranged, and scientific and effective overload car lateral attitude recognition methods is less, bring certain difficulty to the lateral attitude probability Distribution Model research of overload car wheel trace.

Current dynamic weighing system both domestic and external, can only measure the weight of vehicle and speed of a motor vehicle etc. mostly, can't measure vehicle in Zhong lateral attitude, track simultaneously; In addition, whether some vehicle location recognition technologies based on image or laser technology, can't identify the weight of vehicle simultaneously and differentiate and overload.Patent (200910047121) " dynamic weighing system of road vehicle ", based on the piezoelectric cable technology, can be measured gross combination weight, single wheel load and road speed, but can't measure vehicle in Zhong lateral attitude, track; Patent (200810156777.1) " method of the measurement vehicle on expressway Position And Velocity based on line array CCD " by installing two linear array CCD cameras on highway, the interval certain hour is taken the image of the right driving vehicle of its camera lens, ask for the data of coordinate points according to geometric relationship, calculate the lane position at vehicle place, but can not differentiate the weight of vehicle and whether overload.So, a kind ofly can determine on highway bridge that overload car weight amount and its lateral attitude just by active demand simultaneously.

Summary of the invention

The technical problem to be solved in the present invention is, the problems referred to above for the identification of current overload car lateral attitude, a kind of piezoelectric cable laying structure and the trace lateral attitude recognition methods of overloaded vehicle wheel are provided, to determine the overload car weight amount on highway bridge simultaneously, take turns the trace lateral attitude with it.

The present invention is that the technical solution problem adopts following technical scheme:

The characteristics of piezoelectric cable laying structure of the present invention are: on the road surface of Vehicle Driving Cycle road, with piezoelectric cable, form " Z " shape structure, first piezoelectric cable He tri-road piezoelectric cables in described " Z " shape structure are vertical with the track direction, and press vehicle heading one in front and one in back respectively across on half He Youban track, track, a left side; Distance between described first piezoelectric cable Yu tri-road piezoelectric cables is L1, L1 ≠ 0; Second piezoelectric cable and the first piezoelectric cable θ that has angle, θ ≠ 0, described second piezoelectric cable and first piezoelectric cable intersect at the road left side bearing; Described second piezoelectric cable Yu tri-road piezoelectric cables intersect at the road right side bearing.

The characteristics of overloaded vehicle wheel of the present invention trace lateral attitude recognition methods are: utilize described piezoelectric cable laying structure to realize as follows the identification of overloaded vehicle wheel trace lateral attitude:

The vehicle at the uniform velocity travelled is by first piezoelectric cable (3) described " Z " shape structure of at one end sailing into, pass through successively first piezoelectric cable (3), second piezoelectric cable (4) He tri-road piezoelectric cables (5), and sail out of described " Z " shape structure; Order:

Vehicle the near front wheel is successively at t ₁and t ₂the time be engraved in the upper the near front wheel piezoelectric detection signal that produces of first piezoelectric cable (3) and second piezoelectric cable (4);

The vehicle left rear wheel is successively at t ' ₁and t ' ₂the time be engraved in the upper left rear wheel piezoelectric detection signal that produces of first piezoelectric cable (3) and second piezoelectric cable (4);

The vehicle off-front wheel is successively at t ₃and t ₄the time be engraved in the upper off-front wheel piezoelectric detection signal that produces of second piezoelectric cable (4) He tri-road piezoelectric cables (5);

The vehicle off hind wheel is successively at t ' ₃and t ' ₄the time be engraved in the upper off hind wheel piezoelectric detection signal that produces of second piezoelectric cable (4) He tri-road piezoelectric cables (5);

The piezoelectric detection signal produced during through each road piezoelectric cable according to each wheel, calculate respectively and obtain left front wheel load W _fl, left back wheel load W _bl, right front wheel load W _brwith right back wheel load W _fr;

, complete vehicle weight W is obtained by formula (1):

$W=\frac{1}{2}(\underset{i}{\mathrm{\Σ}}\underset{j}{\overset{n}{\mathrm{\Σ}}}{w}_{\mathrm{ij}}+\underset{1}{\overset{n}{\mathrm{\Σ}}}{w}_{4j});(i=\mathrm{3,5})---\left(1\right)$

In formula (1): n is axletree quantity, w _ijthe axle weight that means j signal representative of i piezoelectric cable;

Speed of a motor vehicle v is obtained by formula (2):

$v=\frac{L_1}{t_4-t_1}---\left(2\right)$

Wheelbase d is obtained by formula (3):

$d=v\&times;({\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="HDA0000385615580000011.png"\; state="\{\{state\}\}">t</figure-callout>}}_1^{\&prime;}-t_1)=\frac{{\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="HDA0000385615580000011.png"\; state="\{\{state\}\}">t</figure-callout>}}_1^{\&prime;}-t_1}{t_4-t_1}{L}_1---\left(3\right)$

Wheelspan D is obtained by formula (4):

$D=v\&times;(t_3-t_2)\cot \mathrm{\&theta;}=\frac{t_3-t_2}{t_4-t_1}{\mathrm{<figure-callout\; id="1"\; label="L"\; filenames="HDA0000385615580000011.png"\; state="\{\{state\}\}">L</figure-callout>}}_1\cot \mathrm{\&theta;}---\left(4\right)$

Vehicle is obtained by formula (5) at Zhong lateral attitude, track y:

$y=v\&times;(t_2-t_1)\cot \mathrm{\&theta;}=\frac{t_2-t_1}{t_4-t_1}{\mathrm{<figure-callout\; id="1"\; label="L"\; filenames="HDA0000385615580000011.png"\; state="\{\{state\}\}">L</figure-callout>}}_1\cot \mathrm{\&theta;}---\left(5\right)$

Lateral attitude y refers to the distance of vehicle revolver apart from the track left hand edge.

Therefore, obtain vehicle weight and differentiate based on formula (1) and whether overload, based on formula (5), obtain the overload car in Zhong lateral attitude, track.

The characteristics of overloaded vehicle wheel of the present invention trace lateral attitude recognition methods also are:

The end sailed at described vehicle, arrange ground induction coil 1, L2 ≠ 0 apart from first piezoelectric cable (3) distance for L2.

Described distance L 1 be 2.5m ?3.5m.

Described L2 is 300mm.

Compared with prior art, beneficial effect of the present invention is embodied in:

1, the present invention can obtain and comprise that gross combination weight, single wheel load vehicle and wheelbase, wheelspan, tire number and vehicle are in information such as Zhong lateral attitudes, track, can differentiate overload car weight amount and lateral attitude thereof simultaneously.

2, the present invention is simple in structure, is arranged to " Z " with three piezoelectric cables and just can detects required information of vehicles.

The accompanying drawing explanation

Fig. 1 is structural representation of the present invention;

Number in the figure: 1 ground induction coil, 2 information handling systems, 3 first piezoelectric cables, 4 second piezoelectric cables, 5 the 3rd road piezoelectric cables.

Embodiment

Referring to Fig. 1, in the present embodiment, driving vehicle dynamic weighing sensor is to form " Z " shape structure with piezoelectric cable on the road surface of Vehicle Driving Cycle road, first piezoelectric cable 3 He tri-road piezoelectric cables 5 in " Z " shape structure are vertical with the track direction, and press vehicle heading one in front and one in back respectively across on half He Youban track, track, a left side; Distance between first piezoelectric cable 3 Yu tri-road piezoelectric cables 5 is L1, L1 ≠ 0; Second piezoelectric cable 4 and first piezoelectric cable 3 θ that has angle, θ ≠ 0, second piezoelectric cable 4 intersects at the road left side bearing with first piezoelectric cable 5; Second piezoelectric cable 4 Yu tri-road piezoelectric cables 5 intersect at the road right side bearing.

In the present embodiment, driving vehicle dynamic weighing sensor carries out the method for driving vehicle dynamic weighing and is:

The vehicle at the uniform velocity travelled is at one end sailed into the driving vehicle dynamic weighing sensor of " Z " shape structure by 3 of first piezoelectric cables, pass through successively first piezoelectric cable 3, second piezoelectric cable 4 He tri-road piezoelectric cables 5, and sail out of the driving vehicle dynamic weighing sensor of " Z " shape structure; Order:

Vehicle the near front wheel is successively at t ₁and t ₂in time, is engraved on first piezoelectric cable 3 and second piezoelectric cable 4 and produces the near front wheel piezoelectric detection signal;

The vehicle left rear wheel is successively at t ' ₁and t ' ₂in time, is engraved on first piezoelectric cable 3 and second piezoelectric cable 4 and produces left rear wheel piezoelectric detection signal;

The vehicle off-front wheel is successively at t ₃and t ₄in time, is engraved on second piezoelectric cable 4 He tri-road piezoelectric cables 5 and produces off-front wheel piezoelectric detection signal;

The vehicle off hind wheel is successively at t ' ₃and t ' ₄in time, is engraved on second piezoelectric cable 4 He tri-road piezoelectric cables 5 and produces off hind wheel piezoelectric detection signal;

The piezoelectric detection signal produced during through each road piezoelectric cable according to each wheel, calculate respectively and obtain left front wheel load W _fl, left back wheel load W _bl, right front wheel load W _brwith right back wheel load W _fr;

, complete vehicle weight W is obtained by formula (1):

$W=\frac{1}{2}(\underset{i}{\mathrm{\&Sigma;}}\underset{j}{\overset{n}{\mathrm{\&Sigma;}}}{w}_{\mathrm{ij}}+\underset{1}{\overset{n}{\mathrm{\&Sigma;}}}{w}_{4j});(i=\mathrm{3,5})---\left(1\right)$

In formula (1): n is axletree quantity, w _ijthe axle weight that means j signal representative of i piezoelectric cable;

Speed of a motor vehicle v is obtained by formula (2):

$v=\frac{L_1}{t_4-t_1}---\left(2\right)$

Wheelbase d is obtained by formula (3):

$d=v\&times;({\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="HDA0000385615580000011.png"\; state="\{\{state\}\}">t</figure-callout>}}_1^{\&prime;}-t_1)=\frac{{\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="HDA0000385615580000011.png"\; state="\{\{state\}\}">t</figure-callout>}}_1^{\&prime;}-t_1}{t_4-t_1}{L}_1---\left(3\right)$

Wheelspan D is obtained by formula (4):

$D=v\&times;(t_3-t_2)\cot \mathrm{\&theta;}=\frac{t_3-t_2}{t_4-t_1}{\mathrm{<figure-callout\; id="1"\; label="L"\; filenames="HDA0000385615580000011.png"\; state="\{\{state\}\}">L</figure-callout>}}_1\cot \mathrm{\&theta;}---\left(4\right)$

Vehicle is obtained by formula (5) at Zhong lateral attitude, track y:

$y=v\&times;(t_2-t_1)\cot \mathrm{\&theta;}=\frac{t_2-t_1}{t_4-t_1}{\mathrm{<figure-callout\; id="1"\; label="L"\; filenames="HDA0000385615580000011.png"\; state="\{\{state\}\}">L</figure-callout>}}_1\cot \mathrm{\&theta;}---\left(5\right)$

Lateral attitude y refers to the distance of vehicle revolver apart from the track left hand edge.

In concrete enforcement, the end sailed at vehicle, apart from first piezoelectric cable 3, apart from the ground induction coil 1 of 2000 * 2000mm is set for L2, L2 is 300mm; Arrange distance L 1 for 2.5m ?3.5m.

Form " Z " shape structure with piezoelectric cable in the present embodiment on the road surface of Vehicle Driving Cycle road, configuration information disposal system 2, all input the piezoelectric detection signal of ground induction coil 1 and each road piezoelectric cable generation in signal processing system 2.

In the present embodiment, because the second piezoelectric cable vertically becomes angle theta with runway, pass through this piezoelectric cable when the left side wheel on same axletree is different with right side wheels, can record the load of the single wheel in left and right on same axletree like this, carry out verification by the single wheel load to being recorded by first piezoelectric cable He tri-road piezoelectric cables, judge the unbalance loading situation of vehicle according to wheel load, can judge the number of tire simultaneously according to the number of wheel load pulse.

Claims (5)

1. a piezoelectric cable laying structure, it is characterized in that forming " Z " shape structure with piezoelectric cable on Vehicle Driving Cycle highway bridge road surface, first piezoelectric cable (3) He tri-road piezoelectric cables (5) in described " Z " shape structure are vertical with the track direction, and press vehicle heading one in front and one in back respectively across on half He Youban track, track, a left side; Distance between described first piezoelectric cable (3) Yu tri-road piezoelectric cables (5) is L1, L1 ≠ 0; Second piezoelectric cable (4) and first piezoelectric cable (3) θ that has angle, θ ≠ 0, described second piezoelectric cable (4) intersects at the road left side bearing with first piezoelectric cable (5); Described second piezoelectric cable (4) Yu tri-road piezoelectric cables (5) intersect at the road right side bearing.

2. overloaded vehicle wheel trace lateral attitude recognition methods is characterized in that utilizing piezoelectric cable laying structure claimed in claim 1 to realize as follows the identification of overloaded vehicle wheel trace lateral attitude:

The vehicle at the uniform velocity travelled is by first piezoelectric cable (3) described " Z " shape structure of at one end sailing into, pass through successively first piezoelectric cable (3), second piezoelectric cable (4) He tri-road piezoelectric cables (5), and sail out of described " Z " shape structure; Order:

Vehicle the near front wheel is successively at t ₁and t ₂the time be engraved in the upper the near front wheel piezoelectric detection signal that produces of first piezoelectric cable (3) and second piezoelectric cable (4);

The vehicle left rear wheel is successively at t ' ₁and t ' ₂the time be engraved in the upper left rear wheel piezoelectric detection signal that produces of first piezoelectric cable (3) and second piezoelectric cable (4);

The vehicle off-front wheel is successively at t ₃and t ₄the time be engraved in the upper off-front wheel piezoelectric detection signal that produces of second piezoelectric cable (4) He tri-road piezoelectric cables (5);

The vehicle off hind wheel is successively at t ' ₃and t ' ₄the time be engraved in the upper off hind wheel piezoelectric detection signal that produces of second piezoelectric cable (4) He tri-road piezoelectric cables (5);

The piezoelectric detection signal produced during through each road piezoelectric cable according to each wheel, calculate respectively and obtain left front wheel load W _fl, left back wheel load W _bl, right front wheel load W _brwith right back wheel load W _fr;

, complete vehicle weight W is obtained by formula (1):

$W=\frac{1}{2}(\underset{i}{\mathrm{\&Sigma;}}\underset{j}{\overset{n}{\mathrm{\&Sigma;}}}{w}_{\mathrm{ij}}+\underset{1}{\overset{n}{\mathrm{\&Sigma;}}}{w}_{4j});(i=\mathrm{3,5})---\left(1\right)$

In formula (1): n is axletree quantity, w _ijthe axle weight that means j signal representative of i piezoelectric cable;

Speed of a motor vehicle v is obtained by formula (2):

$v=\frac{L_1}{t_4-t_1}---\left(2\right)$

Wheelbase d is obtained by formula (3):

$d=v\&times;(t_1^{\&prime;}-t_1)=\frac{t_1^{\&prime;}-t_1}{t_4-t_1}{L}_1---\left(3\right)$

Wheelspan D is obtained by formula (4):

$D=v\&times;(t_3-t_2)\cot \mathrm{\&theta;}=\frac{t_3-t_2}{t_4-t_1}{L}_1\cot \mathrm{\&theta;}---\left(4\right)$

Vehicle is obtained by formula (5) at Zhong lateral attitude, track y:

$y=v\&times;(t_2-t_1)\cot \mathrm{\&theta;}=\frac{t_2-t_1}{t_4-t_1}{L}_1\cot \mathrm{\&theta;}---\left(5\right)$

Lateral attitude y refers to the distance of vehicle revolver apart from the track left hand edge;

Therefore, obtain vehicle weight and differentiate based on formula (1) and whether overload, based on formula (5), obtain the overload car in Zhong lateral attitude, track.

3. overloaded vehicle wheel according to claim 2 trace lateral attitude recognition methods is characterized in that: the end sailed at described vehicle arranges ground induction coil 1, L2 ≠ 0 apart from first piezoelectric cable (3) distance for L2.

4. overloaded vehicle wheel according to claim 2 trace lateral attitude recognition methods is characterized in that: described distance L 1 is 2.5m ?3.5m.

5. overloaded vehicle wheel according to claim 3 trace lateral attitude recognition methods, it is characterized in that: described L2 is 300mm.

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