CN101650206B - Capacity detecting method of horizontal oil tank - Google Patents

Abstract

The invention relates to a capacity detection method of a horizontal oil tank, which comprises the following steps: acquiring data reflecting the capacity change principle of the horizontal oil tank, i.e. measuring the data; processing the measured data according to an integral unification formation principle, finding out the capacity change principle of the horizontal oil tank; and pegging geometric dimension of the capacity change of the horizontal oil tank according to the capacity change principle, and obtaining a capacity table of the horizontal oil tank by the geometric dimension. The capacity detection method of the horizontal oil tank can obtain an oil tank capacity table with high accuracy, has scientific setting, high accuracy, convenient operation and strong practicability, and avoids the problems of business termination, tank emptying, poor safety, high cost and the like during obtaining the oil tank capacity table.

Description

A kind of volume calibration method of horizontal tank

Technical field

The present invention relates to a kind of volume calibration method of horizontal tank.

Background technology

Oil tank is as refuelling station's oil product reservoir vessel, in the business process, is to manage through the variation that stores oil product in the oil tank to the quantity control of actual oil product, depends on oil tank volume list.After the fuel charger business is paid oil product quantity, need to be grasped how much actual oil product quantity of paying is in the oil tank, how are the actual business of oil product quantity, storage, loss situation etc.; Simultaneously,, avoid leakage pollution environment or the like, manage, just must possess the accurate one to one oil tank volume list of each oil tank the quantity and the safety of business for monitoring oil tank operating position.

The oil tank of refuelling station is the horizontal metal can that buries ground, and the centre is a cylinder, and two ends are arched top, and it generally is 20m that other shapes, specification are also arranged extremely individually ³, 30m ³, 50m ³Three kinds, the overwhelming majority is 30m ³Oil tank.

Common oil tank volume calibration method is carried out according to national JJG266-96 horizontal metal can volume calibration rules.Calibration method in the vertification regulation is a geometric measurement method, comprises two kinds of outside geometric measurement method and inner geometry mensurations:

(1) outside geometric measurement method: the interior diameter that obtains every girth sheets through the measurement of every circle outer perimeter; The linear measure longimetry of every girth sheets obtains the length of horizontal cylinder; The arcs at top etc. are measured and are obtained geometric configuration, obtain cumulative volume and partial volume through computing, finally obtain loading table;

The characteristics of outside geometric measurement method are: this method is the topmost method that obtains oil tank volume list at present, measures the easiest and practical.Former uncertainty is 0.7%, and after rules were slightly improved, uncertainty was decided to be 0.4%, is the highest method of horizontal tank loading table accuracy.

But outside geometric measurement method adopts the strange land to measure, and installs when existing following difficult point: A, oil tank to bury ground; Be out of shape behind B, the oil tank pressurized; C, what is more important oil tank can't be examined and determine after using with burying again.

(2) inner geometry mensuration: the interior diameter that obtains every girth sheets through every circle symmetric points measurement of length; The linear measure longimetry of every girth sheets obtains the length of horizontal cylinder; Measurements such as arc to the top obtain geometric configuration, obtain cumulative volume and partial volume through computing, finally obtain loading table.

The characteristics of inner geometry mensuration are: this method is one of main method that obtains oil tank volume list, measures easy and practical.Uncertainty also is one of the highest method of horizontal tank loading table accuracy.

But there is following difficult point: A in the inner geometry mensuration, determines the diameter of a girth sheets with one group of symmetric points, and is poor with respect to externally measured method accuracy; B, use the back because stop doing business, clear jar, safety, expense or the like problem difficulty accomplish to examine and determine again.Again examine and determine very expensively, the people gets into by the safety problem (difference that metage is used) in the space of oil vapour sealing or the like, and each oil tank calibrating need pay through the nose.

Because the existence of these difficult points makes to be difficult to the inaccurate problem of oil tank volume list ubiquity accomplish with a 30m ³Oil tank, from filling oil to being sent out by fuel charger the empty process, the difference of loading table and fuel charger reaches 200 liters with interior (by 0.7% comparison of former rules).

Be difficult to geometric method carry out under the condition of normal calibrating in national JJG266-96 horizontal metal can volume calibration rules, many mechanisms attempt various ways, mainly are volumetric methods.The standard volumetric method is: after cleaning out the oil tank of being examined and determine; The value of having confirmed liquid medium in the standard is injected oil tank; The height of measuring liquid level in oil tank; This process is carried out repetition from low to high, till the oil tank of being examined and determine fills with medium, the accumulative total of the repeatedly value in the standard is delivered to oil tank.In each measurement point, value is carried out difference, obtain loading table, other volumetric method is similar.

When people solved the problem of oil tank volume list with various volumetric methods, the measuring height of liquid level was the foundation of distributing medium value in the second interface, in processing procedure, two problems can occur:

Usually, the error that the medium value is confirmed is thousand fens positions, even littler; The height value is a hundredths with the error of the interior medium of its representative scope when confirming, even bigger, the high level error of measuring height occurs.

After the medium value is confirmed,, after the setting oil tank length, can obtain a chord length approx in the oil tank cross section in two equal timesharing in interface of measuring height; When distributing the adjacent interface of consideration to segment with stage body, the chord length (Fig. 1 (a) and (b)) of oil tank can be occurred more approaching, but reliable chord length can't be obtained, do not know even how much difference is.Can't obtain accurately under the diameter condition, this will be a disposal route preferably in the conventional method, but have moulding to distribute not to be very reasonably problem.

When people solve the problem of oil tank volume list with various volumetric methods; The high level error of measuring height and what occur in minute timing is not that very rational two problems do not have desirable the solution; The accuracy of verification result can be very not high, is the technical reason that other the whole bag of tricks can not replace vertification regulation.

The characteristics of standard volumetric method: the value of the liquid medium of confirming in the standard has pin-point accuracy, but as a system, how the height error of measuring liquid level and medium value distribute in two interfaces, make the accuracy of this method receive considerable influence.Also have this method and similar approach because stop doing business, clear jar, high cost or the like problem, be difficult to carry out and popularize calibrating.

In sum, the volume calibration method of present horizontal tank all can't be used the low-cost high loading table of accuracy that obtains.

Summary of the invention

Technical matters to be solved by this invention provides a kind of volume calibration method of horizontal tank, can enough low-cost high oil tank volume lists of accuracy that obtains.

For solving the problems of the technologies described above, the present invention proposes a kind of volume calibration method of horizontal tank, need not to stop doing business in the said method implementation process and clear jar, specifically may further comprise the steps:

1) gathers the data that reflect horizontal tank volumetric quantity Changing Pattern, i.e. measurement data:, survey the liquid level in the oil tank with filling oil product in the oil tank; And write down pairing all fuel charger accumulative totals of oil tank at that time, the liquid level when filling oil product in the oil tank in the oil tank and at that time pairing all the fuel charger accumulative totals of oil tank as one group of measurement data, after the oiling; Its liquid level is surveyed in about 1/20th o'clock of the whole oil tank total amount of every minimizing, and record fuel charger accumulative total at that time; As one group of data; Until end, to gather and obtain 20 groups of data, the measuring error of said liquid level is less than 2 millimeters;

2) with unified mathematical model measuring height is revised; By unified global formation rule distribute data: the inclination oil tank is divided into 3 equal portions; Beginning to intersect the circle ghost image from the bottom is respectively 1,2,3 ... The average external volume of each height and position can be removed 3 according to the ghost image number of projection and obtain, and begins to be 1/3,2/3 respectively from the bottom, middle part 3/3,2/3,1/3; Draw the roughly line segment of average then in each position; After each line segment linked to each other with camber line, the inclination oil tank became an ellipsoid, converts ellipsoid into right cylinder again; It is the right cylinder that horizontal tank changes horizontality into; Set up mathematical model in view of the above: wherein I be the height after ellipsoid changes right cylinder into, L is ellipsoidal height, a, b are the long axis of ellipse and the minor axis in former ellipsoid cross section;

3) measuring height that will confirm total amount is chosen in little top, cross section and afterbody; The head and the tail data are confirmed total amount, and middle measurement data only plays shaping rule, makes measuring error control to 0.1%;

4) top and tail height measurement data are accepted or rejected by 2 millimeters measuring error;

5) every part of loading table is with unified geometric data, and the whole unified rule of measurement range external application calculates;

6) the measuring height error is carried out variance analysis; Use the accumulative total volume read-out each measuring height to be analyzed as the medium standard; Reflect that each measuring height is to the deviation situation of whole standard and the correction of measuring height; In the variance analysis that every part of result of calculation produces automatically, obtain reflection, simultaneously the variance analysis figure of result of calculation with the medium difference data; The final loading table of the horizontal tank that obtains representing with physical dimension.

Adopt the volume calibration method of horizontal tank of the present invention; Can access the high oil tank volume list of accuracy; Method is provided with science, accuracy is high, easy and simple to handle, practical, and can avoid obtaining in the process of oil tank volume list stop doing business, problems such as clear jar, safety, high cost.

Description of drawings

Fig. 1 is measuring height correction among the present invention and medium distribution synoptic diagram;

Fig. 2 is the result of calculation variance analysis figure after examining and determine again with the loading table of geometric method calibrating with a large amount plan method;

Fig. 3 is the synoptic diagram of inclination oil tank.

Embodiment

If regard the whole part of can using of underground petrol tank as a model; Be placed on it on the ground and can slicing treatment; Underground petrol tank just can become the ground oil tank so; It is stereoscopic model that the actual volume of whole measuring weight range just can be seen as, if it (is V that this stereoscopic model is converted into the mathematical model establishment _H=f (x)), the actual volume of each sheet conforms to result of calculation, and the volume at any position can use unified f (x) to represent, so, the physical dimension shape of underground petrol tank is traced to the source, and oil tank volume list also just obtains understanding and determines.Therefore; Main design of the present invention is; According to the variation relation of level gauging height in fuel charger accumulative total volume read-out and the oil tank, gather the data of reflection horizontal tank volumetric quantity Changing Pattern, find the Changing Pattern of horizontal tank volumetric quantity according to these data; And then, obtain the loading table of horizontal tank by this physical dimension according to this Changing Pattern physical dimension that oil tank volume changes of tracing to the source.Below horizontal tank volume calibration method of the present invention be called a large amount intend calibration method.

Specifically; The present invention through the existing data that can reflect the oil tank volume Changing Pattern, finds the Changing Pattern of oil tank volume amount with the mathematical model of a large amount plan calibrating procedure intension; Trace to the source and to represent the physical dimension of oil tank volume Changing Pattern; And the comparison of satisfied and volume read-out, deviation obtain the loading table of pin-point accuracy in 0.1%.

The operation steps that a large amount is intended calibration method is divided into two steps, the one, data acquisition, the 2nd, data processing.Respectively this two step is described below.

1, data acquisition;

In normal business process,, measure the level gauging height in the oil tank with filling oil product (nearly 95%) in the oil tank; And record at that time pairing all the fuel charger accumulative totals of this oil tank (oil tank can corresponding a plurality of fuel chargers; Here said " all fuel charger accumulative totals " is meant the summation of accumulative total on pairing each fuel charger of oil tank), as one group of measurement data, this oil tank is started a business after the oiling with these two data; When having reduced about 1/20th left and right sides of whole oil tank total amount; Measure the level gauging height in the oil tank once more, and record fuel charger accumulative total at that time, oil product distributes in the oil tank (remaining 5% approximately) in so continuously being operated to.Raw data (level gauging height and fuel charger accumulative total in the some groups of oil tanks of promptly gathering) is inserted " a large amount intends raw data acquisition and former table is identified " table, and the level gauging height is found the volume of former loading table, data acquisition end.

The data set number of gathering is about 20 groups, and the measuring error of the level gauging height in the oil tank is controlled in 2 millimeters, and promptly the measuring error of the level gauging height in the oil tank is less than 2 millimeters.Midsummer and severe winter are avoided in data acquisition as far as possible, are chosen in to carry out better season in spring and autumn.Other detection method require be each point control at 1 millimeter, visible, the inventive method requires lower to the acquisition precision of level gauging height in the oil tank, and in the present invention, thick measuring error occurs almost to not influence of result accidentally.

In addition, this step of data acquisition also can adopt acquisition scheme fast, such as pouring the first jar into the second jar, examines and determine simultaneously for two jars.

2, the data of gathering are handled, found the Changing Pattern of horizontal tank volumetric quantity, and then, obtain the loading table of horizontal tank by this physical dimension according to this Changing Pattern physical dimension that oil tank volume changes of tracing to the source according to this image data.

The final goal that a large amount is intended calibration method is the geometric data of oil tank shape of tracing to the source, and the means of use are: the global formation rule by unified is revised and distribute data measuring height; The measuring height of confirming value is chosen in top (oil tank volume total amount 95% place) and the afterbody (oil tank volume total amount 5% place) that representativeness is big, the measuring error influence is little, the cross section is less; The head and the tail data are confirmed total amount, and middle measurement data only rises confirms the moulding law effect; Top and tail height measurement data are accepted or rejected by the requirement of basic law; Every part of loading table is with unified geometric data; The whole unified rule of measurement range external application is calculated; Be the accuracy of judgement result of calculation and the reliability of image data; (measuring height exists measuring error to be provided with the variance analysis of measuring height; Reflect measuring error at this place of measuring height with the result of calculation of unifying shaping rule by each point, this difference can embody the difference of each measurement point and whole unified shaping rule in the variance analysis of result of calculation; Represent with difference in volume; And show with curve simultaneously), come the final geometric data of realizing magnitude tracing to oil tank with these means and important goal, obtain oil tank volume list.What support to realize these targets is automatically according to the oil tank raw data, seeks the mathematical model that oil tank is unified the Changing Pattern intension, is that to realize that the oil tank shape is traced to the source basic.

(1) with unified mathematical model measuring height is revised, by unified global formation rule distribute data;

The problem of the high level error of measuring height and medium unreasonable distribution is the technical reason that present additive method cannot replace geometric method, and the value unreasonable distribution problem that solves and eliminate in measuring height high level error and the interface is one of our most important target.

An oil tank generally can be divided into two parts, and two ends are identical end sockets (some oil tank does not have end socket) of shape, and main part is a right cylinder in the design, and main part is the main object that we study.

Though it is considered herein that on the oil tank body design it is a right cylinder of rule; Owing to fabrication and installation or the like reason; But exist, need to consider this factor during we are provided with, must consideration will be embedded in underground oil tank and carry out tilt correction to be similar to the ellipsoid state; And become ellipsoidal oil tank and revise after will making distortion and compressive deformation, obtain the solid of the rule of horizontality.

Burying the ground oil tank more or less tilts; And liquid is horizontal positioned; Thereby the right cylinder of design but do not exist with the right cylinder state on reality is used, and we can not be with the major axis of former cylindrical diameter as this jar to the oil tank that tilts; We think: the vertical plane of main part is the major axis of this jar, and can regulate the base diameter (being right cylinder) that becomes this jar horizontality.Be analyzed as follows:

Might as well earlier lift an example: in length one regularly, the inclination oil tank is divided into 3 five equilibriums (Fig. 3), begins to intersect the circle ghost image from the bottom and be respectively 1,2,3...... to the inclination oil tank; The average external volume of each height and position; Can remove 3 according to the ghost image number of projection and obtain, begin to be 1/3,2/3 respectively from the bottom, middle part 3/3,2/3,1/3, draw the roughly line segment of average then in each position; After each line segment linked to each other with camber line, the inclination oil tank had become an ellipsoid.

The oil tank that tilts is oval from vertical plane, and oil tank is made, compressive deformation, and oil tank also exists with ellipticalness approx, must consider oil tank is arrived right cylinder with the actual converted that ellipsoid exists.

We ask the area of oval

earlier; Make that the projection major axis is a, minor axis is b.

Area s=4 ∫ ydx

Wherein $y=\frac{b}{a}\sqrt{a^2-x^2}$

$S=4\∫\frac{b}{a}\sqrt{a^2-x^2}\mathrm{dx}=\frac{4b}{a}\∫\sqrt{a^2-x^2}\mathrm{dx}$

Volume V=Ls

Ask round x again ²+ y ²=a ²Area

Area S=4 ∫ ydx

Wherein $y=\sqrt{a^2-x^2}$

$S=4\∫\sqrt{a^2-x^2}\mathrm{dx}$

Volume V=1S

Relation between the two does

$41\∫\sqrt{a^2-x^2}\mathrm{dx}=\frac{4b}{a}L\∫\sqrt{a^2-x^2}\mathrm{dx}$

$41=\frac{4b}{a}L$

$I=\frac{b}{a}L$

Ellipsoid distortion is transformed into tank diameter numerical value behind the right cylinder greater than original diameter; With original total amount by the range assignment that increases; Should say than geometric measurement method more to meet reality,, reflect physical presence objectively although this oil tank and processing procedure are virtual presences; This is that we are based on the foundation analyzed from the new right cylinder of horizontality; Also be that the present invention has one of reason of pin-point accuracy, this method has found that in application process some total amount is close, and the former loading table that many geometric methods bigger than normal are measured at the middle part.In result of calculation with the comparison of volume read-out in, the actual negative value (as shown in Figure 2) that occurs in middle part.

After oil tank was transformed into horizontality, the height error of measuring liquid level and medium distributed and can on the round section of oil tank, reflect simply.

We combine Fig. 1 that this process is described.

If the circle among Fig. 1 is represented actual oil tank (loading table accurately); Horizontal line is represented extensive measuring height; Article two, in the horizontal line medium value of confirming; The difference of oblique line and oil tank wall is exactly deviation, and the residual quantity between horizontal solid line among the figure and the horizontal empty two wires is exactly the margin of error of measuring height and calibrated altitude.

Fig. 1 (a), Fig. 1 (b) are with average difference and the reflection of difference medium value according to certain rules by measuring height.

It is irregular that oil tank appears in the measuring height error of high-order; The distribution of medium value has reflected the difference of the line and the actual oil tank wall of second interface.The existence of two factors has reflected the loading table of additive method generation and the difference of actual oil tank.

Oil tank integral body is regular; Occurring irregular is our the height measuring error and the moulding deviation of people's data allocations; According to this outwardness, we suppose earlier measuring irregular among Fig. 1 (b) and outer wall steel plate that occur be used as be the iron sheet push-and-pull to meeting on the whole circumference, the result has confirmed that the medium of value changes the level gauging height naturally; Difference with former measuring height appears; The amount that roughly need revise of measuring height just, and obtain comparatively accurately chord length, former measuring height matches with unified diameter on correspondence position through revising the resulting chord length in back; Promptly the value of the medium real current situation by oil tank is connected with straight dashed line, obtain the accurately adjustment (Fig. 1 (c)) of measuring height with oblique line; And be that the straight dotted line that plastic sheeting will connect is adjusted to circumference (Fig. 1 (d)) through iron sheet is used as, the result makes medium fill up by circumference, obtains height control and unified solid accurately, and the medium value distributes and is also undertaken by this.The result makes the solid that measuring height correction and medium value distribute becomes rule (correction result is by the variance analysis or deviation curve figure (Fig. 2) reflection of result of calculation).

The mathematical model main body that we set is the right cylinder of horizontality, and when preseting length, what need research is the circular section.On any point of stereoscopic model, its differential confirms on any one height, definite chord length to be arranged.Through amplifying or dwindling the circular section of mathematical model, mathematical model is matched at that point with stereoscopic model.

A large amount is intended the oil tank volume list preparation method is calculated its mathematical model by the integration of each part differential and diameter (method to rules is traced to the source); We select n data (about 20) as n-1 section, and middle each several part is confirmed various parameters through differential.

The differential of mathematical model is under the requirement of design standards; Through the adjustment parameter mathematical model and stereoscopic model on each aspect are matched; Through the unlimited computing that approaches, satisfy in the deviation range that the design standards formula allows voluntarily, reach actual matching with section; The differential of mathematical model is obtained on the basis that conforms to the innage oil mass section of various piece, obtains the unified basic standard right cylinder of stereoscopic model.

From the result of practical application, there is end enclosure structure at about 80% oil tank two ends.The end enclosure structure of introducing in the rules has arched top, oval top, segment top, circular cone top, round platform top etc., and most of oil tank mainly is an arched top.We calculate the unified quadric surface of pressing of its structure in calculating, according to three-point fix, through operation result, realize dv _H=dv _2R-H, the two symmetric part differential up and down of promptly crossing central shaft are identical.

For making loading table that higher accuracy arranged, the oil tank geometric data of confirming basic configuration that we trace to the source substep is proceeded the whole parameters of revising, and the geometric data of representing the oil tank mathematical model is equated with total oil mass of measurement fully; Conform to the section at other each positions, reach geometric data and loading table and reflect objective reality exactly.

Unified rule, represent the tracing to the source of geometric data of oil tank physical presence, mathematical model, supported the realization of other means of method.Tracing to the source of the geometric data of oil tank mathematical model is the core of this method; Solved in theory and highly measured high level error and medium value unreasonable distribution and three basic problems of pin-point accuracy; Whether reasoning is final successful; Need can reflect whether represent objective reality to four aspects checkings of the result that solves these three basic problems and application, conclusion sees following reliability diagram for details.

(2) measuring height that will confirm value is chosen in little top, cross section and afterbody; The head and the tail data are confirmed total amount, and middle measurement data only plays shaping rule;

The quantitative really X100% of relative error δ=measuring error/representative.

The afterbody on the top, 2 millimeters of height measuring error, amount is 20 liters, 30 liters of front and back secondary square error less thaies; 1 millimeter of height measuring error, amount is 10 liters, 20 liters of front and back secondary square error less thaies; And the medium value of centre of representative is when being 27000 liters, and relative error 0.1% is confirmed total amount with the top tail data in the mathematical model program is provided with; All middle measurement data only supply to confirm oil tank rule and shape use, and wrong data can not change loading table (except indivedual positions) yet, and are different fully with additive method in the data processing; Such setting makes measuring error control to 0.1%, can satisfy the refuelling station and normally just can carry out data acquisition under the business condition; And has a sufficiently high accuracy; Having created basic condition for popularization and application, measured 0.1% error and we can say, is present requirement that additive method is beyond one's reach on being provided with.

(3) top and tail height measurement data are accepted or rejected by basic requirement;

Except that top afterbody and indivedual positions, the height measuring error is had no effect to the result of loading table, or even indivedual misdata can not change the net result of loading table yet; The top tail data is the critical data of pin-point accuracy,, the top afterbody is provided with outside 2 millimeters measuring error of permission for this reason; Prevent thick measuring error, program is provided with the comparing function of data, when unexpected data occurring; Can accept or reject automatically; Being provided with like this realized that the oil tank calibrating need not the professional and just can obtain measurement data, and the data that can use normal business realize one of target easy and simple to handle as the calibrating data.

(4) every part of loading table is with unified geometric data; The whole unified rule of measurement range external application is calculated;

Unified geometric data can guarantee the whole unitarity of the data in measurement range, also is the requirement that realizes pin-point accuracy, is that the amount of representative in the measurement range is big more, and measuring error is more little, can guarantee the pin-point accuracy in the usable range; Oil tank is regular, and scope also has essentially identical rule outward, and process result has like this realized not stopping doing business, under unclear jar, safing condition, low expense just can realize to bury oil tank examine and determine.From with normal data relatively, the top is above with below the afterbody, calculates that this can not use the amount of part can be slightly variant, cries on the capacity measurement extremely and measures, about 10 liters of errors do not have influence on use.

(5) the measuring height error is carried out variance analysis.Be the accuracy of judgement result of calculation and the reliability of image data, the present invention is provided with the variance analysis of measuring height.

Mathematical model is being sought rule in the measurement data to this oil tank; Match is unified in the rule process; Use the accumulative total volume read-out to carry out each measuring height is analyzed as the medium standard; Reflect each measuring height to the deviation situation of whole standard and the correction of measuring height, in the variance analysis that every part of result of calculation produces automatically, obtain reflection, simultaneously with the medium difference data; The variance analysis figure of result of calculation (deviation and the accuracy of new and old loading table and each measurement point accumulative total volume read-out; As shown in Figure 2)) reflected that intuitively the deviation of measuring height fluctuates near standard lines, what reflected each measuring height departs from situation and correction situation, has embodied the order of accuarcy of new loading table.The volume of former loading table when measuring height is provided can also reflect the deviation situation of former loading table and the order of accuarcy of former loading table.Fig. 2 instance is former result of calculation variance analysis figure after examining and determine again with the loading table of geometric method calibrating with a large amount plan method.

Here, describe having the reliability that the overall treatment means realize the mathematical model that the oil tank shape is traced to the source: the mathematical model according to the raw data variable element is the basis that entire method is provided with, and also is the core of method, and it determines entire method.(stereoscopic model promptly is about 20 groups of data of being formed with the amount and the interior level gauging height of oil tank of fuel charger accumulative total in the oil tank to replace stereoscopic model with mathematical model; Or perhaps underground petrol tank); Having solved height measuring error and medium value in theory distributes and three basic problems of pin-point accuracy; But really solve three basic problems and the application thereof of the moulding of measuring height sum of errors data processing, must be through four checkings:

(1) to mathematics model result and the deviation checking that raw data (stereoscopic model) is provided.

1. to the error correction of measuring height.On result of calculation; We compare each measuring height and the unified standard volume that is molded on this height with mathematical model; Measuring height departure that error produces on each measurement point (identical with section difference value) (see figure 2) has reflected the error of measuring height has been revised.

2. the difference of mathematical model and standard value.This is that a large amount is intended the key problem that can mathematical model be used.We are the standard of stereoscopic model with " the horizontal metal oil tank volume list " that metering publishing house publishes, and verify.In more than 1400 parts of tables, choosing a loading table arbitrarily is example (P183 page or leaf): at this total amount 33m ³Loading table in irregularly chosen 19 groups of data; Work out and reappear this loading table and test the result: the loading table of establishment is identical with the total amount of choosing measurement numerical range (stereoscopic model), and each branch's volume (section) differs about 1 liter; Method error is 9 liters; As dead amount (part that can not use in the metering operation before and after extremely amount is meant generally can be not influential to operation, like the following part in the minimum position of fuel charger operation).The match deviate of conventional oil tank mathematical model generally 100,000/several (examples 2/28202), is seen for details table 1.

The deviation result of table 1 mathematical model and standard

(2) shaping rule checking.The result that a large amount is intended produces with unified mathematical model, and the geometric data of input oil tank just can directly produce result of calculation, has solved the medium value and has distributed irregular problem.

(3) checking of pin-point accuracy.

1. the head and the tail data are confirmed total amount, and other positions are with part false data test (particular point exception), and the loading table of result of calculation is constant.

2. the deviation data and the deviation curve that contain each height measurement point in the result of calculation that a large amount is intended; It is near the (see figure 2) 0 biased poor line of standard that the data of all height measurement point all drop on the accumulative total volume read-out; Simultaneously, reflected that the inclination of oil tank, distortion obtain correction.

Therefore, measurement data only plays shaping rule in the middle of making, and the head and the tail data are confirmed total amount, thereby make measuring error bring up to 0.1%.

(4) mathematical model possibility of its application checking.We as you know, underground petrol tank and highly related data are fuel charger accumulative totals, but the level gauging height reduces, and accumulative total increases; The basis accumulative total varies or the like, with height and asynchronous.In a large amount is intended, high i.e. height, amount just must be used accumulative total.Design mathematical model has the data removing function with no direct correlation; Uncertain amount of unified plus-minus in the raw data when model running; Constant the obtaining of the loading table of result of calculation verified; This result had both examined and determine for unclear jar and had created essential condition, simultaneously, had realized being set to by imagination the transformation of application.

The checking conclusion: the mathematical model that a large amount is intended in the calibration method has solved height measuring error and data allocations irregular problem that volumetric method exists; Measuring error brings up to 0.1%; The deviation checking of having passed through mathematical model confirmed the maximum local difference with stereoscopic model be ten thousand/; The mathematical model that a large amount quasi-continuous can be led can be used in the reality business.

Explain that below a large amount is intended thinking and the other problems of considering in the data processing scheme of calibration method:

Data acquisition is based on that data needs and is provided with, and has adopted the metering means of tracing to the source of not attempting as yet on the capacity measurement to implement on the data, is the core.

Because the restriction of underground condition; The JJG266-96 of country vertification regulation exists difficulty to the oil tank calibrating after doing business; When people solve the problem of oil tank volume list with various volumetric methods, exist high level error and unreasonable two technical matterss of data allocations and the high cost problem of carrying out process of measuring height.In two technical matterss, reduce the measuring error of high-order, just need to reduce and measure number of times, but it is bigger the moulding deviation of data allocations to occur; And the many more moulding of measurement number of times are approaching more, but the relative error of measuring is big more.This is the problem of the very difficult solution faced of conventional method.

The oil tank volume list problem to be thoroughly solved, conventional thinking must be broken through.

Oil tank is a solid of rule; Our be based on tracing to the source thinking of dimension of storage tanks; Put thick measurement data in order correction, and handle as standard, if realization of goal by whole rule; Simultaneously, can overcome and stop doing business, clear jar, high cost, avoid security risk or the like problem.

The process of conventional metering activity is the process of transmission of quantity value; (because existence of error in dipping) is the metering process that is delivered to the standard of pin-point accuracy substandard; Metering is in contrast traced to the source and is meant the source procedure that comes of pursuing foundation, and promptly pursues high-level process, and this is the rule of gage work.It only is a theoretic problem that metering is traced to the source.Burying in the ground oil tank volume calibrating because traditional metering method is difficult to solve under the situation of practical problems, we explore various maybe; And attempt theoretic metering traced to the source and in real work, use; Derive the standard of pin-point accuracy with the data of low accuracy, it is conventional to violate convention, launches to attempt with the means that are difficult to make the people put letter; The checking explanation of four aspects is attempted succeeing.On large-scale national capacity measurement technical seminar, carried out exchange of technology in 2005, the evaluation of conference is: started irregular new approaches and new method.

Dimension of storage tanks is traced to the source and has been solved the measuring error problem; Eliminated the moulding offset issue by unified rule distribute data; Confirm that with the head and the tail data total amount has improved accuracy problems; Data acquisition request can require lower than routine measurement, and thick height measuring error can't influence verification result to some extent, has taken all factors into consideration the practicality problem.

Adopt the volume calibration method of horizontal tank of the present invention, can access the high oil tank volume list of accuracy, and can avoid obtaining in the process of oil tank volume list stop doing business, problems such as clear jar, safety, high cost.

The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (1)

1. the volume calibration method of a horizontal tank is characterized in that, need not to stop doing business in the said method implementation process and clear jar, specifically may further comprise the steps:

1) gathers the data that reflect horizontal tank volumetric quantity Changing Pattern, i.e. measurement data:, survey the liquid level in the oil tank with filling oil product in the oil tank; And write down pairing all fuel charger accumulative totals of oil tank at that time, the liquid level when filling oil product in the oil tank in the oil tank and at that time pairing all the fuel charger accumulative totals of oil tank as one group of measurement data, after the oiling; Its liquid level is surveyed in about 1/20th o'clock of the whole oil tank total amount of every minimizing, and record fuel charger accumulative total at that time; As one group of data; Until end, to gather and obtain 20 groups of data, the measuring error of said liquid level is less than 2 millimeters;

2) with unified mathematical model measuring height is revised; By unified global formation rule distribute data: the inclination oil tank is divided into 3 equal portions; Beginning to intersect the circle ghost image from the bottom is respectively 1,2,3 ..., the average external volume of each height and position can be removed 3 according to the ghost image number of projection and obtain; Begin to be 1/3,2/3 respectively from the bottom, middle part 3/3,2/3,1/3; Draw the roughly line segment of average then in each position, after each line segment was linked to each other with camber line, the inclination oil tank became an ellipsoid; Convert ellipsoid into right cylinder again; Be the right cylinder that horizontal tank changes horizontality into, set up mathematical model in view of the above:

wherein I be the height after ellipsoid changes right cylinder into, L is ellipsoidal height; The liquid level that promptly records, a, b are the long axis of ellipse and the minor axis in former ellipsoid cross section;

3) measuring height that will confirm total amount is chosen in little top, cross section and afterbody; The head and the tail data are confirmed total amount, and middle measurement data only plays shaping rule, makes measuring error control to 0.1%;

4) top and tail height measurement data are accepted or rejected by 2 millimeters measuring error;

5) every part of loading table is with unified geometric data, and the whole unified rule of measurement range external application is calculated;

6) the measuring height error is carried out variance analysis; Use the accumulative total volume read-out each measuring height to be analyzed as the medium standard; Reflect that each measuring height is to the deviation situation of whole standard and the correction of measuring height; In the variance analysis that every part of result of calculation produces automatically, obtain reflection, simultaneously the variance analysis figure of result of calculation with the medium difference data; The final loading table of the horizontal tank that obtains representing with physical dimension.

Images