CN114595539B - Dynamic construction method for cam relationship of wind tunnel variable-angle mechanism - Google Patents
Dynamic construction method for cam relationship of wind tunnel variable-angle mechanism Download PDFInfo
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Abstract
The invention discloses a dynamic construction method of a cam relationship of a wind tunnel angle-variable mechanism, which comprises the steps of acquiring the height difference and the horizontal distance between an angle-of-attack corner center and a model center according to a test object, calculating Y-direction compensation quantity corresponding to each selected angle-of-attack corner according to input parameters, removing all data corresponding to cam sectors, sequentially adding calculated cam data points into a system cam disc by taking a single cam sector as a unit according to the number of the cam data points and the capacity of the single cam sector according to an angle sequence, calling cam mapping and starting after all the cam sectors are added, and automatically enabling an angle-of-attack motion shaft and a Y-direction motion shaft to enter a cam synchronous motion state according to a loaded cam relationship. The invention can use different model supporting modes and structures to realize online work, does not need to stop to complete writing and downloading work, and does not influence the execution of other control processes.
Description
Technical Field
The invention relates to the field of wind tunnel tests, in particular to a dynamic construction method for a cam relationship of a wind tunnel variable-angle mechanism.
Background
When the angle of attack of the wind tunnel tail support angle-changing mechanism changes, in order to ensure that the center height of the model is unchanged, the linear compensation motion of the Y-direction mechanism needs to be completed at the same time, and the motion mechanism is shown in figure 1. In order to ensure the synchronism of displacement compensation in the motion process, a cam synchronous control technology is adopted between the attack angle and the Y-direction linear displacement, and cam data needs to be written into a corresponding cam disc of a controller. However, the support modes and support parameters of different tests may have great differences, the common support mode is shown in fig. 2, (a) is a support track of an attack angle center after the center of a model sinks, (b) is a support track of the center of the model and the attack angle center at the same horizontal position, and (c) is a support track of the attack angle center after the center of the model is placed on the platform. However, the following problems should be noted:
1) the cam relation obtained in the whole construction process can ensure the accuracy of compensation control;
2) the whole construction process can dynamically meet the conditions of different model support modes and structural parameter changes;
3) the whole construction process can be completed on line, and other control processes of the control system are not influenced;
4) the whole construction process is automatically carried out, so that the influence caused by manual operation errors is avoided;
5) the whole construction process should be correct and reliable.
According to the cam construction method based on the mathematical function, after the corresponding cam functional relation is obtained according to different model supporting modes and structural parameters, the cam functional relation can be directly loaded by calling a loading interface provided by a controller, and the construction of the cam is completed. However, the cam function definition form that the controller can automatically identify itself is limited, and the requirement of diversified cam function relation definition identification including the variable angle mechanism of the present type cannot be met. Even through mathematical transformation, the problems of complex transformation relation, non-universal transformation relation between different support modes and structural parameters, low accuracy of partial range angle points and the like necessarily exist.
Disclosure of Invention
The invention aims to design a mechanism cam relation dynamic construction method independent of a function relation, and meets the requirement of a motion mechanism on dynamic and accurate construction of different cam relations in a wind tunnel test.
In order to realize the purpose, the invention adopts the following technical scheme:
a dynamic construction method for a wind tunnel variable angle mechanism cam relationship comprises the following steps:
s1: according to the test object, acquiring the height difference between the center of the angle of attack corner and the center of the model
And horizontal distance
；
S2: according to input parametershAndlcalculating to obtain Y-direction compensation quantity corresponding to each selected attack angle point, wherein the Y-direction compensation quantity is a new cam data point, and removing all data corresponding to the original cam sector;
s3: after different model supporting modes and structural parameters are used as input conditions, the construction of the corresponding cam relationship is automatically completed in the form of cam points;
s4: on the basis of S3, according to the number of cam data points and the capacity of a single cam sector, the cam data points calculated in S2 are sequentially added into the system cam disc by taking the single cam sector as a unit according to the angle sequence;
s5: and after all the cam sectors are added, establishing a mapping relation between the cam interpolation point table and all the cam sectors, starting the cam, and enabling the angle-of-attack motion axis and the Y-direction motion axis to automatically enter a cam synchronous motion state according to a loaded cam relation.
In the above technical solution, the selected angle of attack point is determined according to an angle range and a given angle point density.
In the above technical solution, the Y-direction compensation amount corresponding to the attack angle point is calculated as follows:
wherein: y is the amount of compensation in the Y direction,
is the angle of attack.
In the above technical solution, in S2, all compensation quantities of the angle of attack point in the test are directly calculated by the size of the angle of attack, and are not indirectly determined by interpolation.
In the technical scheme, the angle range is consistent with the angle range required by each test, and the density of the angle points can be set according to the minimum interval of the angle points of each test movement.
In the above technical scheme, the angle sequences are fixedly arranged from small to large or from large to small.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
the invention can select the density of the angle points according to the motion requirement, and complete the calculation of the compensation quantity of all the selected motion angle points according to the compensation relation, and does not need to obtain an approximate function through complicated mathematical conversion to determine the cam relation, and in addition, the compensation quantity of a large number of intermediate angle points does not need to be determined through interpolation, thereby ensuring the accuracy of the motion compensation quantity.
After the cam point calculation is completed according to different structural parameters, other steps automatically complete the dynamic update of the cam sector and the effective work of the cam curve, and the whole process can dynamically adapt to the conditions of different model supporting modes and structural parameter changes.
The controller of the invention keeps the online working state all the time, does not need to stop to finish the writing and downloading work, and does not influence the proceeding of other control processes.
After the calculation parameters and the loading instructions are given, the whole calculation and loading process is automatically completed without manual intervention, and the problems of motion relation errors and the like caused by manual operation errors are solved.
The invention ensures the correctness and the reliability of the cam relationship by reasonably planning the calling time sequence and the flow of each function.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic view of the angle of attack action principle of a variable angle mechanism;
FIG. 2 is a schematic view of a common support form;
FIG. 3 is a schematic diagram of a cam parameter dynamic loading process;
FIG. 4 is a schematic diagram of an angle of attack motion compensation relationship;
wherein: a is the center of the angle of attack, and B is the center of the model.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
As shown in fig. 3, the present embodiment is divided into five links:
firstly, selecting the density of angle points according to the motion requirement in the process, completing the calculation of compensation quantities of all selected motion angle points according to the motion compensation relation, and ensuring the accuracy and the integrity of the motion compensation quantities required by the test in the form of a large number of cam points;
secondly, in the process of writing the cam points into a cam data storage area appointed by the controller, a synchronization mechanism is adopted, namely, the original cam data removal and the sequential addition of the cam points are executed strictly according to an appointed time sequence, and after the execution of the previous step is completed, the next step can be executed to ensure that the cam points written into the controller are completely consistent with the cam points obtained by the initial calculation, so that all the cam points in the system can accurately reflect the cam compensation relations corresponding to all the angle points in the test angle range;
thirdly, in the process, after different model supporting modes and structural parameters are used as input conditions, the construction of the corresponding cam relationship is automatically completed in the form of cam points, and the whole process can dynamically adapt to the conditions of different model supporting modes and structural parameter changes;
fourthly, the controller of the whole operation process is always kept in an online working state, and does not need to be stopped to finish writing and downloading work, does not interfere with other control processes, and does not influence the execution of other control processes;
fifthly, after the calculation parameters and the loading instructions are given, the whole construction process is automatically completed through a program, manual intervention is not needed, and the problems of motion relation errors and the like caused by manual operation errors are avoided.
The core of the embodiment lies in the calculation and automatic addition of the Y-direction compensation amount and realizes synchronous motion control. As shown in fig. 4, it is a schematic diagram of the relationship between the angle of attack motion compensation of the mechanism, according to the respective marks and their definitions in the diagram, where:
height difference between center of angle of attack corner and center of model
，
Horizontal distance between center of angle of attack corner and center of model
，
Angle of attack of model rotation
，
Obtaining the Y-direction compensation quantity through the relational expression
。
The system inputs parameters according to the formula
And
the Y-direction compensation amount corresponding to each selected attack angle point can be obtained through calculation, the selected attack angle point is determined according to the angle range and the given angle point density, and the Y-direction compensation amount is a new cam data point.
And temporarily storing the Y-direction compensation quantities in a certain storage area of the system, and after finishing the storage, clearing all original data in a cam data storage area appointed by the controller by the system so as to avoid errors in the corresponding relation of subsequent data. After the clearing is successful, the system divides the cam data adding units according to the number of the cam data points and the size of the data amount allowed by the controller to be added in a single time, and completes the writing of the single cam data adding unit to the cam data storage area successively according to the angle size sequence. After all cam data adding units to be divided are written in, namely all cam data points are added into a system cam data storage area, a cam interpolation point table and the storage area are mapped and the cam is started, and the cam relation can be used for cam synchronous transmission control. The system completes the construction of the corresponding cam relationship according to the new structural parameters.
Such as an angle range of
(from small to large), the interval between the test angle points is
Obtaining a sequence of angle points as
Wherein
，… 
，… 
. Calculating the Y-direction compensation quantity corresponding to each angle point according to the angle point sequence as
Taking each angle point as a main axis and the Y-direction compensation quantity as an auxiliary axis, and obtaining all cam data points as
. Assuming that the capacity of a single cam sector is m (the number of cam data points capable of being accommodated), after all the original data in the storage area of the cam disc is successfully cleared, all the original data in the storage area of the cam disc are sequentially cleared
Writing m cam data points to the 1 st cam sector, will
Writing m cam data points to the 2 nd cam sector, will
And writing the m cam data points to the ith cam sector until all the n cam data points are written, and finishing the data updating of the cam disc. And establishing a mapping relation between the cam disk storage area and the cam interpolation point table, and starting the cam, so that the new cam relation can be used for cam synchronous transmission control. The system completes the calculation and loading process of all cam data points according to the new structural parameters. And controlling the operation of the mechanism, and automatically entering a cam synchronous motion state by the attack angle motion shaft and the Y-direction motion shaft according to the newly loaded cam relationship.
The invention is not limited to the foregoing embodiments.
Claims (5)
1. A dynamic construction method for a wind tunnel variable angle mechanism cam relationship is characterized by comprising the following steps:
s1: according to the test object, acquiring the height difference between the center of the angle of attack corner and the center of the modelhAnd horizontal distancel；
S2: according to input parametershAndlcalculating to obtain Y-direction compensation quantity corresponding to each selected attack angle point, wherein the Y-direction compensation quantity is calculated in the following mode:
wherein: y is the amount of compensation in the Y direction,
is the size of the angle of attack,
the Y-direction compensation quantity is a new cam data point, and all data corresponding to the original cam sector are removed;
s3: after different model supporting modes and structural parameters are used as input conditions, the construction of the corresponding cam relationship is automatically completed in the form of cam points;
s4: on the basis of S3, according to the number of cam data points and the capacity of a single cam sector, the cam data points calculated in S2 are sequentially added into the system cam disc by taking the single cam sector as a unit according to the angle sequence;
s5: and after all the cam sectors are added, mapping the cam interpolation point table and the cam sectors and starting the cam, wherein the attack angle motion shaft and the Y-direction motion shaft automatically enter a cam synchronous motion state according to a loaded cam relationship.
2. The dynamic construction method of the wind tunnel variable angle mechanism cam relationship according to claim 1, characterized in that the selected attack angle point is determined according to an angle range and a given angle point density.
3. The dynamic construction method of the wind tunnel variable-angle mechanism cam relationship according to claim 1, characterized in that in S2, all compensation quantities of the angle of attack point in the test are directly calculated and obtained through the size of the angle of attack, are indirectly determined through interpolation, and are not limited by a cam function definition form that can be automatically recognized by a controller.
4. The dynamic construction method of the wind tunnel variable angle mechanism cam relationship according to claim 2, characterized in that the angle range is consistent with the angle range required by each test, and the density of the angle points can be set according to the minimum interval of the angle points of each test movement.
5. The dynamic construction method of the wind tunnel variable-angle mechanism cam relationship according to claim 1, characterized in that the angle sequences are fixedly arranged from small to large or from large to small.
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| CN211347313U (en) * | 2020-03-11 | 2020-08-25 | 中国空气动力研究与发展中心低速空气动力研究所 | Two-degree-of-freedom dynamic test supporting device for open wind tunnel |
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| DE102011014835B4 (en) * | 2011-03-23 | 2015-09-03 | Airbus Operations Gmbh | Apparatus for adjusting a control surface of an aircraft model, control unit, aircraft model and use of an aircraft model |
| CN102865993B (en) * | 2012-09-24 | 2014-10-15 | 西北工业大学 | Recyclable airplane model experimental facility capable of changing appearance and parameter |
| CN108168833B (en) * | 2017-11-29 | 2019-12-20 | 中国直升机设计研究所 | Open type wind tunnel model test supporting device |
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| CN211347313U (en) * | 2020-03-11 | 2020-08-25 | 中国空气动力研究与发展中心低速空气动力研究所 | Two-degree-of-freedom dynamic test supporting device for open wind tunnel |
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| DFD-03风洞大弯刀尾撑装置设计;卢章树等;《航空精密制造技术》;20160415(第02期);44-47 * |
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