CN103018092B - The full dose method of testing of trees mechanical quantity - Google Patents
The full dose method of testing of trees mechanical quantity Download PDFInfo
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- CN103018092B CN103018092B CN201210493067.4A CN201210493067A CN103018092B CN 103018092 B CN103018092 B CN 103018092B CN 201210493067 A CN201210493067 A CN 201210493067A CN 103018092 B CN103018092 B CN 103018092B
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- trunk
- trees
- sensor
- wind
- snow
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- 238000010998 test method Methods 0.000 title claims abstract description 18
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims abstract description 9
- 230000006835 compression Effects 0.000 claims abstract description 9
- 238000007906 compression Methods 0.000 claims abstract description 9
- 229910052709 silver Inorganic materials 0.000 claims abstract description 9
- 239000004332 silver Substances 0.000 claims abstract description 9
- 238000010008 shearing Methods 0.000 claims abstract description 4
- 238000005452 bending Methods 0.000 claims description 8
- 230000007613 environmental effect Effects 0.000 claims description 6
- 230000006378 damage Effects 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 4
- 230000001066 destructive effect Effects 0.000 claims description 3
- 239000004677 Nylon Substances 0.000 claims description 2
- 229920001778 nylon Polymers 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 3
- 230000007812 deficiency Effects 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 2
- 230000005483 Hooke's law Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000003938 response to stress Effects 0.000 description 1
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- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
Abstract
The invention discloses the full dose method of testing of trees mechanical quantity, this method of testing, comprise trunk under strong wind pattern, heavy snow pattern and wind and snow and silver thaw accompany each other pattern three kinds of environment, by installing deformation-sensor at trunk diverse location and position angle, can measure trunk because of produce under Different climate condition stretching, compression and shearing strain quantity, and be converted to stress by related algorithm.Instant invention overcomes the deficiency of existing measuring technique, method of testing is simple, can obtain whole trees mechanical information amount, assesses for gardens ancient and well-known trees, shade tree and forest zone trees wind resistance/snow disaster evil capability analysis and risk of breakage.
Description
Technical field
The present invention relates to the anti-drifting snow hazard capability evaluation of trees and guard technology field, specifically belong to the full dose method of testing of trees mechanical quantity.
Background technology
How to realize under the effect of wind-force snow load, test the gordian technique that complete trees mechanical information is the anti-drifting snow hazard ability of research trees.But up to now, the investigative technique that various countries there is no in trees mechanical quantity measuring technology is reported and document, some improvement are only had to be on sensor performance, and be only limited to measure the axial deformation of trees when bending and apply unidirectional Hooke's law in method of testing and make simple Analysis On Bending Strength, such method of testing and technical Analysis data measured limited, can accurately to the prediction of trees defensive ability/resistance ability in the presence of a harsh environment.
Content of the present invention
The object of the invention is the full dose method of testing proposing trees mechanical quantity, overcome the deficiencies in the prior art, method of testing is simple, can obtain whole trees mechanical information amount and corresponding Algorithm Analysis.
The technical solution used in the present invention is as follows:
The full dose method of testing of trees mechanical quantity, this described method of testing, comprise trunk to accompany each other environment three kinds of environmental testings at strong wind pattern, heavy snow pattern and wind and snow and silver thaw, by installing 4-6 deformation-sensors at trunk diverse location and position angle, measure trunk because of produce under Different climate condition stretching, compression and shearing strain quantity, and be converted to stress by related algorithm, thus obtain whole trees mechanical information amount for the analysis of trees Resisting fractre intensity and assessment.
Described strong wind pattern, trunk orthogonal diameters is installed two axial sensor and to become the sensor of+45 ° ,-45 ° with axis with two, when there being strong wind, bending and torsion distortion is produced to trunk, trunk bending and torsion deflection can be measured by the sensor be arranged on trunk, again by strain stress state analysis and algorithm, the assessment to trees wind damage resisting ability can be realized, judge the maximum wind velocity that trees can be born.
Described in heavy snow pattern, trunk orthogonal diameters installs four axial sensor, when there being heavy snow to trunk produce curved, press combination stressed state, being separated and measurement of trunk flexural deformation and compression deformation can be measured by the sensor be arranged on trunk, again by strain stress state analysis and algorithm, can realize assessing the risk of trees anti-snow load ability, judging the maximum snowfall that trees can be born.
Describedly to accompany each other environmental pattern at wind and snow and silver thaw, trunk orthogonal diameters is installed four axial sensor with two to become with axis+45 ° with the sensor of-45 °, when branch because sleet snow and the extension that is covered with ice, trees are at wind-force, under ice carries acting in conjunction, trunk is in curved, pressure, the complex combination stress turned round, trunk can be measured by the sensor be arranged on trunk to bend, compression is separated and measurement with torsional strain, again by strain stress state analysis and algorithm, the assessment to trees safety index can be obtained, and destructive factor, the judgement of mode and position.
Described sensor records numerical value under various regimes and can directly input computing machine and automatically complete, and department of computer science's trees failing stress ultimate value that database provides of unifying is compared, and judges, at trunk, factor, mode and the orientation destroyed to occur.
Described sensor to be arranged on nylon cushion block and to be fixed on trunk by the upper and lower two elastic wire rings penetrated wherein.
Compared with the prior art, beneficial effect of the present invention is as follows:
The present invention is by diverse location angle installation position displacement sensor in trunk, for different wind/snow disaster evil (as strong wind, heavy snow, wind and snow and silver thaw accompany each other) pattern, work out a kind of " full dose measuring technology " that can obtain whole trees mechanical information amount and corresponding Algorithm Analysis, thus can the whole stress responses of Realization analysis trees under different wind-force snow disaster model function, and by the destruction of trees and the basis of destruction factor identification, realize the scientific evaluation to trees wind resistance/snow disaster evil ability and fracture early warning.
Accompanying drawing explanation
Fig. 1 is that the present invention is at strong wind atmosphere lower sensor mounting structure schematic diagram on tree body;
Fig. 2 is that the present invention is at heavy snow environment sensor mounting structure schematic diagram on tree body;
Fig. 3 is that the present invention is setting mounting structure schematic diagram on body at wind and snow and silver thaw environment sensor;
Fig. 4 is the tree body force analysis figure of the present invention under strong wind atmosphere strong wind pattern.
Embodiment
See accompanying drawing, the full dose method of testing of trees mechanical quantity, this described method of testing, comprise trunk in strong wind pattern, heavy snow pattern and wind and snow and silver thaw accompany each other environment three kinds of environmental testings, when in strong wind pattern, trunk orthogonal diameters is installed two axial sensor and becomes+45 ° with two with axis, the sensor of-45 °, described sensor is by upper, lower elastic wire ring is fixed on trunk, when there being strong wind, bending and torsion distortion is produced to trunk, trunk bending and torsion deflection can be measured by the sensor be arranged on trunk, again by strain stress state analysis and algorithm, the assessment to trees wind damage resisting ability can be realized, judge the maximum wind velocity that trees can be born, when in heavy snow pattern, trunk orthogonal diameters installs four axial sensor, described sensor is fixed on trunk by upper and lower elastic wire ring, when there being heavy snow to trunk produce curved, press combination stressed state, being separated and measurement of trunk flexural deformation and compression deformation can be measured by the sensor be arranged on trunk, again by strain stress state analysis and algorithm, can realize assessing the risk of trees anti-snow load ability, judging the maximum snowfall that trees can be born, when environmental pattern of accompanying each other at wind and snow and silver thaw, trunk orthogonal diameters is installed four axial sensor with two to become with axis+45 ° with the sensor of-45 °, described sensor is by upper, lower elastic wire ring is fixed on trunk, when branch because sleet snow and the extension that is covered with ice, trees are at wind-force, under ice carries acting in conjunction, trunk is in curved, pressure, the complex combination stress turned round, trunk can be measured by the sensor be arranged on trunk to bend, compression is separated and measurement with torsional strain, again by strain stress state analysis and algorithm, the assessment to trees safety index can be obtained, and destructive factor, the judgement of mode and position.
Some algorithm under strong wind pattern: indicate according to right figure wind direction and moment of flexure and carry out force analysis:
1. the axial line strain analysis associated with wind direction:
Axial strain ε is recorded by axial sensor
1., ε
2., according to M
i=ε
ie π D
3(1-α
4the relation of)/32 calculates moment M
y, M
x, then by
the axial strain along wind direction θ place on trunk periphery can be obtained:
ε
L,θ＝M
θ-π/2/(πD
3(1-α
4)/32E)。
2. the Two-dimensional strain under wind-force and stress state analysis:
Trees are destroyed and start from trunk periphery, and this place can be considered plane stress state problem to analyze.The geometric condition of application elastic body small deformation, according to the strain stress on any direction β in plane
βwith axial strain ε
l, tangential strain stress
twith shearing strain γ on tangential section
tLrelation:
ε
β＝ε
Tcos
2β+ε
Lsin
2β+γ
LTsinβcosβ
(β＝-45°,+45°,90°)
By strain measurement value ε
+ 45 °, ε
-45 °substitute into above formula respectively, can ε be solved
l, ε
t, γ
tL.
Apply the strain-stress relation of timber again:
{σ}＝[C]{ε}
In formula, { σ }, { ε } are respectively stress, strain tensor, and [C] is the stiffness matrix of tree material.Thus, axial normal stress σ can be obtained
l, tangential normal stress σ
twith rift grain to shear stress τ
tL, the trees failing stress ultimate value provided for instrument system and database is compared, the factor judging may to occur to destroy at trunk, mode and orientation.
Claims (3)
1. the full dose method of testing of trees mechanical quantity, it is characterized in that: this described method of testing, comprise trunk to accompany each other pattern three kinds of environmental testings at strong wind pattern, heavy snow pattern and wind and snow and silver thaw, by installing 4-6 deformation-sensors at trunk diverse location and position angle, measure trunk because of produce under Different climate condition stretching, compression and shearing strain quantity, and be converted to stress by related algorithm, thus obtain whole trees mechanical information amount for the analysis of trees Resisting fractre intensity and assessment;
Described strong wind pattern, trunk orthogonal diameters is installed two axial sensor and to become the sensor of+45 ° ,-45 ° with axis with two, when there being strong wind, bending and torsion distortion is produced to trunk, trunk bending and torsion deflection can be measured by the sensor be arranged on trunk, again by strain stress state analysis and algorithm, the assessment to trees wind damage resisting ability can be realized, judge the maximum wind velocity that trees can be born;
Described in heavy snow pattern, trunk orthogonal diameters installs four axial sensor, when there being heavy snow to trunk produce curved, press combination stressed state, can be measured and flexural deformation and the compression deformation of isolating trunk by the sensor be arranged on trunk, again by strain stress state analysis and algorithm, can realize assessing the risk of trees anti-snow load ability, judging the maximum snowfall that trees can be born;
Describedly to accompany each other environmental pattern at wind and snow and silver thaw, trunk orthogonal diameters is installed four axial sensor with two to become with axis+45 ° with the sensor of-45 °, when branch because sleet snow and the extension that is covered with ice, trees are at wind-force, under ice carries acting in conjunction, trunk is in curved, pressure, the complex combination stress turned round, by the sensor be arranged on trunk can measure with isolate trunk bend, compression and torsional strain, again by strain stress state analysis and algorithm, the assessment to trees safety index can be obtained, and destructive factor, the judgement of mode and position.
2. the full dose method of testing of trees mechanical quantity according to claim 1, is characterized in that: described sensor is recorded numerical value under various regimes and automatically completed by the acquisition terminal of trees Mechanical Analyzer and judge the security of trees.
3. the full dose method of testing of trees mechanical quantity according to claim 1, is characterized in that: described sensor to be arranged on nylon cushion block and to be fixed on trunk by the upper and lower two elastic wire rings penetrated wherein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210493067.4A CN103018092B (en) | 2012-11-28 | 2012-11-28 | The full dose method of testing of trees mechanical quantity |
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|---|---|---|---|
| CN201210493067.4A CN103018092B (en) | 2012-11-28 | 2012-11-28 | The full dose method of testing of trees mechanical quantity |
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| CN103018092A CN103018092A (en) | 2013-04-03 |
| CN103018092B true CN103018092B (en) | 2015-10-28 |
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| CN201210493067.4A Expired - Fee Related CN103018092B (en) | 2012-11-28 | 2012-11-28 | The full dose method of testing of trees mechanical quantity |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106226470B (en) * | 2016-07-22 | 2019-06-11 | 孙红 | A method of measuring the firm performance of Chinese scholartree by measuring device |
| CN106226471B (en) * | 2016-07-22 | 2019-04-26 | 合肥龙图腾信息技术有限公司 | A method of the wind resistance of measurement Chinese scholartree |
| CN106198877A (en) * | 2016-07-22 | 2016-12-07 | 陈显桥 | By the method measuring unit check willow stability |
| US11215597B2 (en) | 2017-04-11 | 2022-01-04 | Agerpoint, Inc. | Forestry management tool for assessing risk of catastrophic tree failure due to weather events |
| CN107092747A (en) * | 2017-04-21 | 2017-08-25 | 安徽农业大学 | Trees wind load assay method |
| CN108061781A (en) * | 2017-12-13 | 2018-05-22 | 广州德科投资咨询有限公司 | It is a kind of applied to the greening monitoring method of smart city and intellectual monitoring robot |
| CN109060557A (en) * | 2018-06-14 | 2018-12-21 | 安徽农业大学 | Trees torque and coefficient of rigidity test method |
| CN113188745B (en) * | 2021-04-26 | 2022-08-30 | 北京林业大学 | Method and device for testing wind load of crown of standing tree |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101226054A (en) * | 2008-01-08 | 2008-07-23 | 北京林业大学 | Method and device for automatic measurement of live stumpage tree diameter growth quantity real time |
| CN101231280A (en) * | 2008-02-21 | 2008-07-30 | 中国林业科学研究院木材工业研究所 | Method for detecting live stumpage strength nondestructively |
| CN102636148A (en) * | 2012-04-16 | 2012-08-15 | 安徽农业大学 | Nondestructive measurement method for tree deformation |
| CN102706963A (en) * | 2011-06-16 | 2012-10-03 | 王立海 | Stress wave nondestructive detection device for ancient tree/ancient building timber structure inner decay |
-
2012
- 2012-11-28 CN CN201210493067.4A patent/CN103018092B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101226054A (en) * | 2008-01-08 | 2008-07-23 | 北京林业大学 | Method and device for automatic measurement of live stumpage tree diameter growth quantity real time |
| CN101231280A (en) * | 2008-02-21 | 2008-07-30 | 中国林业科学研究院木材工业研究所 | Method for detecting live stumpage strength nondestructively |
| CN102706963A (en) * | 2011-06-16 | 2012-10-03 | 王立海 | Stress wave nondestructive detection device for ancient tree/ancient building timber structure inner decay |
| CN102636148A (en) * | 2012-04-16 | 2012-08-15 | 安徽农业大学 | Nondestructive measurement method for tree deformation |
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Inventor after: Shao Zhuoping Inventor after: Wu Yijun Inventor after: Chen Pin Inventor before: Shao Zhuoping Inventor before: Chen Pin Inventor before: Wu Yijun |
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Granted publication date: 20151028 Termination date: 20191128 |