CN102840899A - Method for measuring entrained water quality of immersed tube joints - Google Patents
Method for measuring entrained water quality of immersed tube joints Download PDFInfo
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- CN102840899A CN102840899A CN2012103324696A CN201210332469A CN102840899A CN 102840899 A CN102840899 A CN 102840899A CN 2012103324696 A CN2012103324696 A CN 2012103324696A CN 201210332469 A CN201210332469 A CN 201210332469A CN 102840899 A CN102840899 A CN 102840899A
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- immersed tube
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- spring
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Abstract
The invention relates to a method for measuring the entrained water quality of immersed tube joints, which includes the following steps: fixedly connecting a flat plate and a longitudinal beam and arranging the flat plate in water, so as to form a virtual pool bottom; placing an immerse tube in pool water, connecting the two sides of the immersed tube with the wall of a pool, closely connecting an acceleration transducer with the immersed tube, enabling the mounting direction of the acceleration transducer to be identical with the moving direction of the immersed tube, and enabling the acceleration transducer to be connected with a dynamic testing system of a computer through a data line; giving an initial displacement to the immersed tube, and supplying the oscillography to the acceleration signal of the acceleration transducer through the dynamic testing system, so as to read the motion period value of the immersed tube joints and calculating the equivalent quality m water of the immersed tube in water; directly weighing the immersed tube in the air, so as to obtain the equivalent quality m air of the immersed tube in the air; and obtaining the entrained water quality of the immersed tube according to the formula m delta equals to m water minus m air. By adopting the method, the rather correct entrained water quality of the immersed tube joints is obtained, the testing cost is saved, the testing period is greatly shortened, and the economy is improved.
Description
Technical field
The present invention relates generally to a kind of method of measuring immersed tube tube coupling added mass of entrained water, can accurately measure the tube coupling added mass of entrained water, for prediction tube coupling motion response lays the first stone.
Background technology
The attached water of immersed tube tube coupling is to change the mode of immersed tube tube coupling equivalent mass, and the motion in water has an immense impact on to the immersed tube tube coupling, therefore, for lengthwise movement, transverse movement and the heave movement of predicting the immersed tube tube coupling significance is arranged.
During over strait/river bridge is built, adopt the immersed tube tube coupling to form the mode of subaqueous tunnel more.The immersed tube tube coupling is generally built in the land, checks the formulation marine site by tugboat after accomplishing.In the delivery process because the influence of ambient water, make immersed tube in the process of translation just as having increased the part quality, influenced the motion of immersed tube.How to calculate the quality of this part water accurately and effectively,, accurately select appropriate delivery mode to seem particularly important for prediction immersed tube motion response.
Summary of the invention
Technical matters to be solved by this invention is to propose a kind of method of measuring immersed tube tube coupling added mass of entrained water to above-mentioned prior art; This method energy measurement goes out the added mass of entrained water of swaying, surging and three translational degree of freedom of heave; Thereby can predict the forms of motion of immersed tube in water more exactly, confirm to use which kind of tugboat.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: a kind of method of measuring immersed tube tube coupling added mass of entrained water is characterized in that including following steps:
1) water filling in the pond, the depth of water are immersed tube height more than 1.5 times, above the pond, are provided with supporting traverse, and supporting traverse is provided with longeron;
2) flat board is fixedly connected with longeron, flat board places water, forms at the bottom of the virtual pond;
3) immersed tube is put into the Chi Shuizhong of the top at the bottom of the virtual pond, linked to each other with the pool wall in pond with vertical both sides of spring with immersed tube, when the immersed tube lengthwise movement, the spring equivalent stiffness of immersed tube both lateral sides is identical; Perhaps with spring both lateral sides is linked to each other with the pool wall in pond, when the immersed tube transverse movement, the spring equivalent stiffness of the vertical both sides of immersed tube is identical; Perhaps with spring immersed tube is linked to each other with supporting traverse with at the bottom of the pond in pond respectively both sides up and down, when the immersed tube heave movement, the spring equivalent stiffness of both sides diagonal is identical about the immersed tube;
4) degree of will speed up sensor closely is connected with immersed tube and synchronizes them motion, and the installation direction of acceleration transducer is consistent with immersed tube direction of motion, and acceleration transducer links to each other with the dynamic test system of computing machine through data line;
5) in vertical, horizontal or heave direction; Give initial displacement of immersed tube; Through the acceleration signal oscillography of dynamic test system to acceleration transducer; Read the period of motion value of the tube coupling of immersed tube; Through formula
; Obtain the equivalent mass
of immersed tube in water; K is the equivalent stiffness coefficient of spring, and T is the period of motion value of the tube coupling of immersed tube;
6) direct weighing immersed tube in air obtains its aerial quality
;
7) through formula
, obtain immersed tube in water vertically, laterally or the added mass of entrained water the during motion of three directions of heave;
8) regulate to connect the long bolt at the false end, to change the top depth of water of the false end, repeating step 5) and step 7), the immersed tube when obtaining the different depth of water in water vertically, laterally or the added mass of entrained water during three directions motions of heave.
Ultimate principle of the present invention is:
Test is a simulation spring single-degree-of-freedom undamped oscillation situation, by the oscillatory differential equation of undamped-free vibration:
If introduce
, then the following formula equation can be written as:
Following formula is the canonical differential equation of single-mode system undamped-free vibration, and it is the second order homogeneous linear differential equation, and its general solution is:
The cycle of system is
; Then
, additional mass does
Beneficial effect of the present invention is: the present invention utilizes simple spring mass system principle; Can test by simple test comparatively, can draw immersed tube tube coupling added mass of entrained water comparatively accurately, not only practice thrift experimentation cost; And the test period is shortened greatly, improved economy.
Description of drawings
Fig. 1 is a process flow diagram of measuring immersed tube tube coupling added mass of entrained water;
Fig. 2 is the vertical view of device of the false end;
Fig. 3 is the false end and pipe-sinking device plan view;
Fig. 4 is the attached water gaging device of an immersed tube tube coupling surging vertical view;
Fig. 5 is the attached water gaging device of an immersed tube tube coupling swaying vertical view;
Fig. 6 is the attached water gaging device of an immersed tube tube coupling heave plan view.
Embodiment
Below in conjunction with accompanying drawing and embodiment each technical scheme of the present invention is done further detailed explanation, but this explanation can not be construed as limiting the invention.
The attached water embodiment of surging is like Fig. 4
1) water filling in pond 1; The depth of water is immersed tube height more than 1.5 times, above the pond, is provided with supporting traverse 2, and supporting traverse is provided with longeron 3; The immersed tube thickness and the depth of water that can adopt are as shown in table 1, adopt immersed tube thickness 14.25mm, the depth of water to adopt 56.25m in the present embodiment.
Table 1 immersed tube thickness and depth of water example
| Immersed tube thickness (mm) | The depth of water (mm) |
| 14.25 | 56.25 |
| 20 | 60 |
| 30 | 90 |
2) flat board 4 is fixedly connected with longeron, flat board places water, forms at the bottom of the virtual pond;
3) immersed tube 6 is put into the Chi Shuizhong of the top at the bottom of the virtual pond, linked to each other with the pool wall in pond with vertical both sides of spring 5 with immersed tube, the spring equivalent stiffness of immersed tube both lateral sides is identical.The example medi-spring is made up of four groups of spring parallel connections; Wherein two groups of springs are in series by three springs; Other two groups of springs are in series by six springs, then
.
4) degree of will speed up sensor closely is connected with immersed tube and synchronizes them motion, and the installation direction of acceleration transducer is consistent with immersed tube direction of motion, is vertically, and acceleration transducer links to each other with the dynamic test system of computing machine through data line;
5) at longitudinal direction; Giving initial displacement of immersed tube is 150mm; Through the acceleration signal oscillography of dynamic test system to acceleration transducer; Read the period of motion value of the tube coupling of immersed tube; Through formula
; Obtain the equivalent mass
of immersed tube in water; K is the equivalent stiffness coefficient of spring; T is the period of motion value of the tube coupling of immersed tube, and T is 3.55s in the example,
=172.12kg.
6) direct weighing immersed tube in air; Obtain its aerial quality
, the immersed tube quality is 140.625kg in the example.
7) through formula
, obtaining immersed tube added mass of entrained water during lengthwise movement in water is 31.495kg;
8) regulate to connect the long bolt at the false end, be respectively 37.5mm, 25mm, repeating step 5 to change the top depth of water of the false end) and step 7), the immersed tube when obtaining the different depth of water is the added mass of entrained water during lengthwise movement in water.
The attached water embodiment of swaying
1) water filling in the pond, the depth of water are immersed tube height more than 1.5 times, above the pond, are provided with supporting traverse, and supporting traverse is provided with longeron.The immersed tube thickness and the depth of water that can adopt are as shown in table 1, adopt immersed tube thickness 14.25mm, the depth of water to adopt 56.25m in this example.
Table 1 immersed tube thickness and depth of water example
| Immersed tube thickness (mm) | The depth of water (mm) |
| 14.25 | 56.25 |
| 20 | 60 |
| 30 | 90 |
2) flat board is fixedly connected with longeron, flat board places water, forms at the bottom of the virtual pond.
3) immersed tube is put into the Chi Shuizhong of the top at the bottom of the virtual pond, linked to each other with the pool wall in pond with the both lateral sides of spring with immersed tube, the spring equivalent stiffness of the vertical both sides of immersed tube is identical.The example medi-spring is made up of four groups of spring parallel connections; Every group of spring is in series by three springs, then
.
4) degree of will speed up sensor closely is connected with immersed tube and synchronizes them motion, and the installation direction of acceleration transducer is consistent with immersed tube direction of motion, is laterally, and acceleration transducer links to each other with the dynamic test system of computing machine through data line;
5) at horizontal direction; Give initial displacement 150mm of immersed tube; Through the acceleration signal oscillography of dynamic test system to acceleration transducer; Read the period of motion value of the tube coupling of immersed tube; Through formula
; Obtain the equivalent mass
of immersed tube in water, k is the equivalent stiffness coefficient of spring, and T is the period of motion value of the tube coupling of immersed tube.T is 4s in the example,
=180.68kg.
6) direct weighing immersed tube in air; Obtain its aerial quality
, the immersed tube quality is 140.625kg in the example.
7) through formula
, obtaining immersed tube added mass of entrained water during lengthwise movement in water is 40.055kg;
8) regulate to connect the long bolt at the false end, be respectively 37.5mm, 25mm, repeating step 5 to change the top depth of water of the false end) and step 7), the horizontal added mass of entrained water when motion in water of the immersed tube when obtaining the different depth of water.
The attached water embodiment of heave
1) water filling in the pond, the depth of water are immersed tube height more than 1.5 times, above the pond, are provided with supporting traverse, and supporting traverse is provided with longeron.The immersed tube thickness and the depth of water that can adopt are as shown in table 1, adopt immersed tube thickness 14.25mm, the depth of water to adopt 56.25m in this example.
Table 1 immersed tube thickness and depth of water example
| Immersed tube thickness (mm) | The depth of water (mm) |
| 14.25 | 56.25 |
| 20 | 60 |
| 30 | 90 |
2) flat board is fixedly connected with longeron, flat board places water, forms at the bottom of the virtual pond.
3) immersed tube is put into the Chi Shuizhong of the top at the bottom of the virtual pond, with spring immersed tube is linked to each other with supporting traverse with at the bottom of the pond in pond respectively both sides up and down, when the immersed tube heave movement, the spring equivalent stiffness of both sides diagonal is identical about the immersed tube.The example medi-spring is made up of 8 groups of spring parallel connections; Every group of spring is in series by three springs, then
.
4) degree of will speed up sensor closely is connected with immersed tube and synchronizes them motion, and the installation direction of acceleration transducer is consistent with immersed tube direction of motion, is laterally, and acceleration transducer links to each other with the dynamic test system of computing machine through data line;
5) in the heave direction, give initial displacement of immersed tube, be about 150mm.Through the acceleration signal oscillography of dynamic test system to acceleration transducer; Read the period of motion value of the tube coupling of immersed tube; Through formula
; Obtain the equivalent mass
of immersed tube in water; K is the equivalent stiffness coefficient of spring, and T is the period of motion value of the tube coupling of immersed tube.T is 14.54s in the example,
=273.5kg.
6) direct weighing immersed tube in air; Obtain its aerial quality
, the immersed tube quality is 140.625kg in the example.
7) through formula
, obtaining immersed tube added mass of entrained water during lengthwise movement in water is 132.875kg;
8) regulate to connect the long bolt at the false end, be respectively 37.5mm, 25mm, repeating step 5 to change the top depth of water of the false end) and step 7), the horizontal added mass of entrained water when motion in water of the immersed tube when obtaining the different depth of water.
Claims (1)
1. method of measuring immersed tube tube coupling added mass of entrained water is characterized in that including following steps:
1) water filling in the pond, the depth of water are immersed tube height more than 1.5 times, above the pond, are provided with supporting traverse, and supporting traverse is provided with longeron;
2) flat board is fixedly connected with longeron, flat board places water, forms at the bottom of the virtual pond;
3) immersed tube is put into the Chi Shuizhong of the top at the bottom of the virtual pond, linked to each other with the pool wall in pond with vertical both sides of spring with immersed tube, when the immersed tube lengthwise movement, the spring equivalent stiffness of immersed tube both lateral sides is identical; Perhaps with spring both lateral sides is linked to each other with the pool wall in pond, when the immersed tube transverse movement, the spring equivalent stiffness of the vertical both sides of immersed tube is identical; Perhaps with spring immersed tube is linked to each other with supporting traverse with at the bottom of the pond in pond respectively both sides up and down, when the immersed tube heave movement, the spring equivalent stiffness of both sides diagonal is identical about the immersed tube;
4) degree of will speed up sensor closely is connected with immersed tube and synchronizes them motion, and the installation direction of acceleration transducer is consistent with immersed tube direction of motion, and acceleration transducer links to each other with the dynamic test system of computing machine through data line;
5) in vertical, horizontal or heave direction; Give initial displacement of immersed tube; Through the acceleration signal oscillography of dynamic test system to acceleration transducer; Read the period of motion value of the tube coupling of immersed tube; Through formula
; Obtain the equivalent mass
of immersed tube in water; K is the equivalent stiffness coefficient of spring, and T is the period of motion value of the tube coupling of immersed tube;
6) direct weighing immersed tube in air obtains its aerial quality
;
7) through formula
, obtain immersed tube in water vertically, laterally or the added mass of entrained water the during motion of three directions of heave;
8) regulate to connect the long bolt at the false end, to change the top depth of water of the false end, repeating step 5) and step 7), the immersed tube when obtaining the different depth of water in water vertically, laterally or the added mass of entrained water during three directions motions of heave.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210332469.6A CN102840899B (en) | 2012-09-11 | 2012-09-11 | Method for measuring entrained water quality of immersed tube joints |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210332469.6A CN102840899B (en) | 2012-09-11 | 2012-09-11 | Method for measuring entrained water quality of immersed tube joints |
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| Publication Number | Publication Date |
|---|---|
| CN102840899A true CN102840899A (en) | 2012-12-26 |
| CN102840899B CN102840899B (en) | 2014-08-13 |
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|---|---|---|---|
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1549271A (en) * | 2003-05-07 | 2004-11-24 | 明基电通股份有限公司 | Vibration damper |
| WO2009053762A2 (en) * | 2007-10-26 | 2009-04-30 | George Sioutis | Ship with longitudinally extending foils, inclined keel, and lift producing blades at the stern |
| CN101710242A (en) * | 2009-12-07 | 2010-05-19 | 天津大学 | Method for monitoring anchoring line of deep-sea terrace |
-
2012
- 2012-09-11 CN CN201210332469.6A patent/CN102840899B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1549271A (en) * | 2003-05-07 | 2004-11-24 | 明基电通股份有限公司 | Vibration damper |
| WO2009053762A2 (en) * | 2007-10-26 | 2009-04-30 | George Sioutis | Ship with longitudinally extending foils, inclined keel, and lift producing blades at the stern |
| CN101710242A (en) * | 2009-12-07 | 2010-05-19 | 天津大学 | Method for monitoring anchoring line of deep-sea terrace |
Non-Patent Citations (3)
| Title |
|---|
| 翁长俭: "双圆柱体附连水质量试验研究", 《武汉水运工程学院学报》 * |
| 董威: "三圆柱体附连水质量的数值计算", 《中国舰船研究》 * |
| 钱勤: "求附连水质量的一种直接方法", 《力学与实践》 * |
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| CN102840899B (en) | 2014-08-13 |
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