CN101650206A - 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, andavoids 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 by 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, the quantity and the safety of business is managed, just must possess the accurate one to one oil tank volume list of each oil tank 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 by 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 by 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 by 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 by 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 enters the safety problem (difference that metage is used) in the space of being sealed by oil vapour 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 the oil tank of being examined and determine is cleaned out, the value of determining 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, two problems can occur in processing procedure:

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

After the medium value is determined,, 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, not be very rational problem but exist moulding to distribute.

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 determining 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 be subjected to 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 obtain the high loading table of accuracy with low cost.

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, gather the data of reflection horizontal tank volumetric quantity Changing Pattern, it is measurement data, unify shaping rule by integral body and handle described measurement data, find 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.

Further, said method also can have following characteristics, and described measurement data comprises in the oil tank level gauging height and pairing all fuel charger accumulative totals of this oil tank at that time.

Further, said method also can have following characteristics, and the measuring error of level gauging height is less than 2 millimeters in the described oil tank.

Further, said method also can have following characteristics, and described measurement data comprises: level gauging height in the oil tank in the measurement data is carried out the global formation correction, and carry out variance analysis.

Further, said method also can have following characteristics, and described loading table is represented with physical dimension.

Further, said method also can have following characteristics, in the described oil tank level gauging height by the global formation correction after the distribution media value, the accumulative total intermediate value value of the volume of any measuring height second interface of described loading table when measuring is not equal to.

Further, said method also can have following characteristics, need not to stop doing business in the described method implementation process and clear jar.

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 height, 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, it is placed 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 measurement 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 represent that so, the physical dimension shape of underground petrol tank is traced to the source with unified f (x), and oil tank volume list also just obtains understanding and determines.Therefore, main design of the present invention is, variation relation according to 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 intends the mathematical model of calibrating procedure intension with a large amount, by the existing data that can reflect the oil tank volume Changing Pattern, find the Changing Pattern of oil tank volume amount, 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 obtains 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, oil product (nearly 95%) will be filled in the oil tank, measure the level gauging height 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), with these two data as one group of measurement data, after this oil tank is started a business and is refueled, 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 (i.e. level gauging height and fuel charger accumulative total in the some groups of oil tanks of Cai Jiing) 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, as seen, 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 and almost the result is not influenced 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: by unified global formation rule measuring height is revised and distribute data; The measuring height of determining 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 determined total amount, and middle measurement data only rises determines 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 is in the variance analysis of result of calculation, can embody the difference of each measurement point and whole unified shaping rule, represent with difference in volume, and show with curve simultaneously), finally realize the geometric data of magnitude tracing with these means and important goal, obtain oil tank volume list to oil tank.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 to be similar to the ellipsoid state, during being provided with, we need to consider this factor, must consideration will be embedded in underground oil tank and carry out tilt correction, 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 is on reality is used, but do not exist with the right cylinder state, 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 lift an example to the inclination oil tank earlier: regularly in length one, the inclination oil tank is divided into 3 five equilibriums (Fig. 3), begin to intersect the circle ghost image from the bottom and be respectively 1,2,3......, 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 oval earlier $\frac{x^2}{a^2}+\frac{y^2}{b^2}=1$ Area, make that the projection major axis is a, minor axis is b.

Area s=4 ∫ ydx

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

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

Volume V=L s

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

Pass between the two is

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

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

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

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 more realistic than geometric measurement method, although this oil tank and processing procedure are virtual presences, but reflected physical presence objectively, 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 reflect simply on the round section of oil tank.

We illustrate this process in conjunction with Fig. 1.

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 determining, 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 to measure irregular in will Fig. 1 (b) and outer wall steel plate that occur to be used as be that the iron sheet push-and-pull is to meeting on the whole circumference, the result has determined that the medium of value changes the level gauging height naturally, difference with former measuring height appears, just measuring height roughly needs the amount revised, and obtain comparatively accurately chord length, former measuring height matches with unified diameter on correspondence position by 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)) by 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 determines on any one height definite chord length to be arranged.By 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 determined various parameters by differential.

The differential of mathematical model is under the requirement of design standards, by adjusting parameter mathematical model and stereoscopic model on each aspect are matched, by 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, by 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 be arranged, the oil tank geometric data of determining 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 fully with total oil mass of measurement; 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 be to four aspects checkings of the result that solves these three basic problems and application, can reflect whether represent objective reality, conclusion sees following reliability diagram for details.

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

The quantitative really X 100% of relative error δ=measuring error/representative.

At the top afterbody, 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, relative error 0.1%, in being provided with, the mathematical model program determines total amount with the top tail data, all middle measurement data are only used for definite oil tank rule and shape, wrong data can not change loading table (except indivedual positions) yet, different fully in the data processing with additive method, 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 position, the height measuring error is had no effect to the result of loading table, or even indivedual misdatas also can not change the net result of loading table, the top tail data is the critical data of pin-point accuracy, for this reason, the top afterbody is provided with outside 2 millimeters measuring error of permission, prevent thick measuring error, program is provided with the comparing function of data, when unexpected data occurring, can accept or reject automatically, such being provided with realized that the oil tank calibrating need not the professional and just can obtain measurement data, and can realize one of target easy and simple to handle with normal data of doing business 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 the result of Chu Liing 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 and 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, carry out each measuring height is analyzed for the medium standard with the accumulative total volume read-out, 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 with the medium difference data, simultaneously, 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)) deviation that has reflected measuring height intuitively 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 example 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 by 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.Choosing a loading table in more than 1400 parts of tables 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), 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, as 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 determined total amount, and (particular point exception) tested with the part false data in other positions, 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 determined 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.The mathematical model of design has the data removing function with no direct correlation, uncertain amount of unified plus-minus in the raw data when model running, the loading table of result of calculation is constant to be verified, this result had both examined and determine for unclear jar and had created essential condition, simultaneously, realized being set to the transformation of application by imagination.

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 determined 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.

The following describes a large amount and intend thinking and the other problems considered in the data processing scheme of calibration method:

Data acquisition is provided with according to the data processing needs, has adopted the metering means of tracing to the source of not attempting as yet on the capacity measurement to implement on the data processing, 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 by whole rule, if realization of goal, 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 the standard of pin-point accuracy is delivered to 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 possibilities, 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, violate the convention routine, launch to attempt with the means that are difficult to make the people put letter, the checking explanation of four aspects is attempted succeeing.Carried out exchange of technology in 2005 on large-scale national capacity measurement technical seminar, 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, determine that with the head and the tail data total amount has improved accuracy problems, data acquisition request can require lower than routine measurement, thick height measuring error can't influence to some extent to verification result, 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 only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (7)

1. the volume calibration method of a horizontal tank, it is characterized in that, gather the data of reflection horizontal tank volumetric quantity Changing Pattern, it is measurement data, unify shaping rule by integral body and handle described measurement data, find 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.

2. the volume calibration method of horizontal tank according to claim 1 is characterized in that, described measurement data comprises in the oil tank level gauging height and pairing all fuel charger accumulative totals of this oil tank at that time.

3. the volume calibration method of horizontal tank according to claim 2 is characterized in that, the measuring error of level gauging height is less than 2 millimeters in the described oil tank.

4. the volume calibration method of horizontal tank according to claim 2 is characterized in that, described measurement data comprises: level gauging height in the oil tank in the measurement data is carried out the global formation correction, and carry out variance analysis.

5. the volume calibration method of horizontal tank according to claim 1 is characterized in that, described loading table is represented with physical dimension.

6. the volume calibration method of horizontal tank according to claim 4, it is characterized in that, in the described oil tank level gauging height by the global formation correction after the distribution media value, the accumulative total intermediate value value of the volume of any measuring height second interface of described loading table when measuring is not equal to.

7. the volume calibration method of horizontal tank according to claim 1 is characterized in that, need not to stop doing business in the described method implementation process and clear jar.

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