CN112525482B

CN112525482B - Device and method for measuring deformation and temperature in high-temperature wind tunnel environment

Info

Publication number: CN112525482B
Application number: CN202011331735.4A
Authority: CN
Inventors: 冯雪; 王锦阳; 张金松; 岳孟坤; 唐云龙
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Priority date: 2020-11-24
Filing date: 2020-11-24
Publication date: 2021-09-17
Anticipated expiration: 2040-11-24
Also published as: CN112525482A

Abstract

The present disclosure relates to a device and a method for measuring deformation and temperature under a high temperature wind tunnel environment, wherein the device comprises: the first part and the second part of the fixed bracket are connected through a mechanical arm; the first part is connected with the high-temperature wind tunnel examination bin; the second part is fixedly provided with a first image acquisition device and an acceleration sensor; the control device is used for controlling the acceleration sensor to acquire the acceleration of the second part at the current moment and controlling the first image acquisition device to acquire the image of the surface of the tested piece at the current moment in the high-temperature wind tunnel examination process of the tested piece; and obtaining the displacement of the second part at the current moment according to the acceleration at the current moment, and controlling the movement of the mechanical arm according to the displacement of the second part at the current moment so as to keep the position of the first image acquisition equipment unchanged. Through the method and the device, the vibration of the first image acquisition equipment can be effectively inhibited, and the quality of the acquired surface image of the tested piece is improved.

Description

Device and method for measuring deformation and temperature in high-temperature wind tunnel environment

Technical Field

The disclosure relates to the technical field of testing, in particular to a device and a method for measuring deformation and temperature in a high-temperature wind tunnel environment.

Background

The high-temperature wind tunnel examination is an effective means for simulating aircrafts and the like in service environments, tests are carried out on a tested piece through high-temperature airflow, the mechanical and thermal properties of the tested piece can be effectively evaluated, and important references are provided for aircraft structure design and thermal protection material design. In the high-temperature wind tunnel assessment process, the real-time monitoring of the surface appearance evolution of the tested piece and the calculation of the surface deformation field and the temperature field of the tested piece are important. However, the vibration of the image acquisition device can be caused by the large-amplitude vibration caused by factors such as unstable high-temperature airflow in the high-temperature wind tunnel examination cabin, high-power wind tunnel operation and the like, so that the quality of the acquired surface image of the tested piece is not high, the difficulty in post-processing of the image is increased, and the calculation accuracy of the surface deformation field and the temperature field of the tested piece is influenced.

Disclosure of Invention

In view of the above, the present disclosure provides a device, a method and a storage medium for measuring deformation and temperature in a high temperature wind tunnel environment.

According to an aspect of the present disclosure, there is provided a device for measuring deformation and temperature in a high temperature wind tunnel environment, the device comprising: the system comprises a high-temperature wind tunnel examination cabin, a first image acquisition device, a control device, an acceleration sensor, a mechanical arm and a fixed support; the device comprises a high-temperature wind tunnel examination cabin, a high-temperature wind tunnel and a power supply, wherein a tested piece is fixed in a closed space of the high-temperature wind tunnel examination cabin, and an observation window is arranged on the high-temperature wind tunnel examination cabin; the high-temperature wind tunnel examination cabin is used for carrying out high-temperature wind tunnel examination on the tested piece; the fixed bracket comprises a first part and a second part, and the first part and the second part are connected through the mechanical arm; the first part is connected with the high-temperature wind tunnel examination bin; the second part is fixedly provided with the first image acquisition equipment and the acceleration sensor; the first image acquisition equipment is used for acquiring an image of the surface of the tested piece through the observation window; the acceleration sensor is used for acquiring the acceleration of the second part; the mechanical arm is used for adjusting the position of the first image acquisition equipment; the control device is electrically connected to the first image acquisition device, the acceleration sensor and the mechanical arm, and the control device is used for: in the process of carrying out high-temperature wind tunnel examination on the tested piece, controlling the acceleration sensor to acquire the acceleration at the current moment, and controlling the first image acquisition equipment to acquire the image of the surface of the tested piece at the current moment; and obtaining the displacement of the second part at the current moment according to the acceleration at the current moment, and controlling the mechanical arm to move according to the displacement of the second part at the current moment so as to keep the position of the first image acquisition equipment unchanged.

In a possible implementation manner, the obtaining, according to the acceleration at the current time, the displacement of the second part at the current time includes: obtaining the speed of the second part at the current moment according to the acceleration and the first weight of the acceleration at the current moment, the acceleration and the first weight of the acceleration at the previous moment and the speed of the second part at the previous moment; obtaining the displacement of the second part at the current moment according to the acceleration and the second weight of the acceleration at the current moment, the acceleration and the second weight of the acceleration at the previous moment, the speed of the second part at the previous moment and the displacement of the second part at the previous moment; wherein the first weight of the acceleration at the current time, the first weight of the acceleration at the previous time, the second weight of the acceleration at the current time, and the second weight of the acceleration at the previous time are determined by a rate of change of the acceleration at the previous time.

In one possible implementation, the determining the first weight of the acceleration at the current time, the first weight of the acceleration at the previous time, the second weight of the acceleration at the current time, and the second weight of the acceleration at the previous time by the change rate of the acceleration at the previous time includes:

when the change rate of the acceleration at the previous moment is larger, increasing the first weight and/or the second weight of the acceleration at the previous moment, and reducing the first weight and/or the second weight of the acceleration at the current moment; when the change rate of the acceleration at the previous time becomes small, the first weight and/or the second weight of the acceleration at the previous time is/are decreased, and the first weight and/or the second weight of the acceleration at the current time is increased.

In one possible implementation, the second portion is provided with a mark point; the device further comprises: the second image acquisition equipment is used for acquiring the image of the mark point; the control device is further configured to: in the process of carrying out high-temperature wind tunnel examination on the tested piece, controlling the second image acquisition equipment to acquire the image of the mark point at the current moment; processing the image of the mark point at the current moment to obtain the displacement of the mark point at the current moment (namely the rigid body displacement of the second part at the current moment); and correcting the image of the surface of the tested piece at the current moment according to the displacement of the mark point at the current moment.

In one possible implementation, the acceleration sensor includes a horizontal acceleration sensor and a vertical acceleration sensor; the horizontal acceleration sensor is used for acquiring acceleration in the horizontal direction, and the vertical acceleration sensor is used for acquiring acceleration in the vertical direction; the mechanical arm comprises; a horizontal direction mechanical arm and a vertical direction mechanical arm;

the obtaining of the displacement of the second part at the current moment according to the acceleration at the current moment, and controlling the movement of the mechanical arm according to the displacement of the second part at the current moment, includes: obtaining the horizontal displacement of the second part at the current moment according to the horizontal acceleration at the current moment, and controlling the horizontal mechanical arm to generate displacement with the same size and the opposite direction to the horizontal displacement according to the horizontal displacement of the second part at the current moment; and according to the vertical direction acceleration of the current moment, obtaining the vertical displacement of the second part at the current moment, and according to the vertical displacement of the second part at the current moment, controlling the vertical direction mechanical arm to generate displacement with the same size and the opposite direction of the vertical displacement.

In one possible implementation, the control device is further configured to: and calculating the deformation field and/or the temperature field of the surface of the tested piece according to the corrected image of the surface of the tested piece at the current moment.

In one possible implementation, the apparatus further includes: a compensating light source, a clamping device; the compensation light source is used for compensating the ambient light in the high-temperature wind tunnel examination core; the clamping device is used for fixing the tested piece in the high-temperature wind tunnel examination cabin; the first image acquisition equipment is provided with a filter, and the filter is matched with the compensation light source for use.

According to another aspect of the present disclosure, a method for measuring deformation and temperature in a high temperature wind tunnel environment is provided, which is applied to the above-mentioned device for measuring deformation and temperature in a high temperature wind tunnel environment; the method comprises the following steps:

in the process of carrying out high-temperature wind tunnel examination on a tested piece, controlling an acceleration sensor to acquire the acceleration of a second part at the current moment, and controlling first image acquisition equipment to acquire an image of the surface of the tested piece at the current moment;

and obtaining the displacement of the second part at the current moment according to the acceleration of the second part at the current moment, and controlling the movement of the mechanical arm according to the displacement of the second part at the current moment so as to keep the position of the first image acquisition equipment unchanged.

According to another aspect of the present disclosure, there is provided a device for measuring deformation and temperature in a high temperature wind tunnel environment, comprising: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to perform the above method.

According to another aspect of the present disclosure, there is provided a non-transitory computer readable storage medium having computer program instructions stored thereon, wherein the computer program instructions, when executed by a processor, implement the above-described method.

In the embodiment of the disclosure, the fixed bracket comprises a first part and a second part, and the first part and the second part are connected through a mechanical arm; the first part is connected with the high-temperature wind tunnel examination bin, and the second part is fixedly provided with a first image acquisition device and an acceleration sensor. In the high-temperature wind tunnel assessment process of a tested piece in the high-temperature wind tunnel assessment bin, the control device controls the acceleration sensor to acquire the acceleration of a second part at the current moment and controls the first image acquisition device to acquire an image of the surface of the tested piece at the current moment; the displacement of the second part at the current moment is obtained according to the acceleration at the current moment, and the movement of the mechanical arm is controlled according to the displacement of the second part at the current moment, so that the position of the first image acquisition equipment is kept unchanged, and the first image acquisition equipment can still be kept stable even under the condition that other parts such as the examination bin and the like vibrate, so that the vibration of the first image acquisition equipment in the high-temperature wind tunnel examination process is effectively inhibited, and the quality of the acquired surface image of the tested piece is improved.

Other features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of the disclosure and, together with the description, serve to explain the principles of the disclosure.

FIG. 1 illustrates a block diagram of a deflection and temperature measurement device in a high temperature wind tunnel environment, according to an embodiment of the present disclosure;

FIG. 2 illustrates a schematic structural diagram of an acceleration sensor according to an embodiment of the present disclosure;

FIG. 3 illustrates a schematic diagram of acceleration reconstructed velocity according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram illustrating deformation of a subregion of an image in a digital image correlation method according to an embodiment of the present disclosure;

FIG. 5 illustrates a block diagram of a deflection and temperature measurement device in a high temperature wind tunnel environment, according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram illustrating landmark matching computation displacements in accordance with an embodiment of the present disclosure;

FIG. 7 illustrates a flow chart of a method of deformation and temperature measurement in a high temperature wind tunnel environment according to an embodiment of the present disclosure;

FIG. 8 illustrates a flow chart of a method of deformation and temperature measurement in a high temperature wind tunnel environment according to an embodiment of the present disclosure;

FIG. 9 shows a block diagram of an apparatus for deformation and temperature measurement in a high temperature wind tunnel environment, according to an embodiment of the present disclosure.

Detailed Description

Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.

Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present disclosure may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present disclosure.

FIG. 1 shows a block diagram of a device for measuring deformation and temperature in a high temperature wind tunnel environment according to an embodiment of the present disclosure. As shown in fig. 1, the apparatus may include: the high-temperature wind tunnel assessment cabin 101, a first image acquisition device 102, a control device 103, an acceleration sensor 104, a mechanical arm 105 and a fixing support 106.

The high temperature wind tunnel examination cabin 101 has a tested piece 107 fixed in a closed space, and the tested piece may be a high temperature material to be examined, for example, a thermal protection material commonly used in the field of aerospace, and is not limited herein. The high-temperature wind tunnel examination cabin is used for carrying out high-temperature wind tunnel examination on the tested piece; an observation window 108 is arranged on the high-temperature wind tunnel examination cabin; exemplarily, a clamping device 109 is further arranged in the high-temperature wind tunnel examination cabin and used for fixing the tested piece in the high-temperature wind tunnel examination cabin; the high-temperature wind tunnel examination cabin is also provided with a compensation light source 110, the compensation light source is used for compensating the ambient light in the high-temperature wind tunnel examination cabin, for example, the compensation light source can adopt a blue light source and can be matched with a blue light filter for use, so that a clear image of the surface of the tested piece is obtained on the basis of avoiding overexposure caused by strong light radiation.

A fixed support 106, which may include a first portion and a second portion, wherein the first portion and the second portion are connected by a robot arm 105; the first part is connected with the high-temperature wind tunnel examination bin; the second part is fixedly provided with a first image acquisition device and an acceleration sensor.

The first image acquisition device 102 is used for acquiring the image of the surface of the tested piece through the observation window, and the first image acquisition device is electrically connected with the control device and can transmit the acquired image of the surface of the tested piece in real time. The first image capturing device may include one or more capturing units, each of which may be a CCD camera, a CMOS camera, or the like, for example, the first image capturing device may include two capturing units, which cooperate with each other to capture images of the surface of the test piece from different directions, so that a three-dimensional image of the surface of the test piece may be obtained. Illustratively, a filter 111 may be additionally installed at the front end of the lens of each acquisition unit, for example, the filter may be a blue light filter, the filter wavelength is 460 and 470nm, and the filter is used in cooperation with a compensation light source, so as to eliminate the influence of strong light radiation and obtain a clear image of the surface of the tested piece.

An acceleration sensor 104 for acquiring an acceleration of the second portion; the acceleration sensor is electrically connected with the control equipment and can transmit the acquired acceleration of the second part in real time; since the second part is fixedly connected to the first image capturing device, the acceleration of the second part is the same as the acceleration of the first image capturing device. The number of the acceleration sensors can be one or more, for example, a three-axis acceleration sensor; as another example, there may be acceleration sensors in two different directions. For example, in view of further saving the cost on the basis of maintaining the acquisition precision, the acceleration sensor may include a horizontal acceleration sensor and a vertical acceleration sensor, wherein the horizontal acceleration sensor is used for acquiring the horizontal acceleration of the second part (for example, a direction parallel to the horizontal ground where the high temperature wind tunnel assessment cabin is located may be taken as a horizontal direction), and the vertical acceleration sensor is used for acquiring the vertical acceleration of the second part (for example, a direction perpendicular to the horizontal ground where the high temperature wind tunnel assessment cabin is located may be taken as a vertical direction).

A robot arm 105 for adjusting the position of the first image capturing apparatus; the mechanical arm is electrically connected with the control equipment, can receive a control command sent by the control equipment in real time, and drives the second part to move by executing the control command, so that the position of the first image acquisition equipment is adjusted. For example, the mechanical arm may include a vertical mechanical arm for driving the second portion to move in a vertical direction and a horizontal mechanical arm for driving the second portion to move in a horizontal direction.

The control device 103 may be electrically connected to the first image acquisition device, the acceleration sensor, and the mechanical arm in a wired or wireless manner, and may receive data uploaded by the first image acquisition device, the acceleration sensor, and the mechanical arm in real time, analyze the data, and send a control instruction. Illustratively, the control device may be a processor or an industrial computer or the like.

The control device is configured to: in the process of carrying out high-temperature wind tunnel examination on a tested piece, controlling an acceleration sensor to acquire the acceleration at the current moment, and controlling first image acquisition equipment to acquire an image of the surface of the tested piece at the current moment; and obtaining the displacement of the second part at the current moment according to the acceleration at the current moment, and controlling the movement of the mechanical arm according to the displacement of the second part at the current moment so as to keep the position of the first image acquisition equipment unchanged.

In consideration of engineering application, because the high-temperature wind tunnel environment of the high-temperature wind tunnel examination bin is generally smaller, in order to expand the acquisition range of the surface image of the tested piece and keep higher image precision, the first acquisition equipment is generally arranged at a position close to the observation window, and meanwhile, the first acquisition equipment is fixedly connected with the high-temperature wind tunnel examination bin through a fixing support. In the embodiment of the disclosure, the fixed bracket is arranged to comprise a first part and a second part, and the first part and the second part are connected through a mechanical arm; in the high-temperature wind tunnel examination process of the tested piece in the high-temperature wind tunnel examination bin, the control device can control the acceleration sensor arranged on the second part to acquire the acceleration of the second part in real time and control the first image acquisition device fixedly arranged on the first part to acquire the image of the surface of the tested piece in real time, and the first image acquisition device can acquire the image of the surface of the tested piece at a position close to the observation window, so that the original acquisition range and the original image precision can be kept; the real-time displacement of the second part is reconstructed in real time according to the acceleration, and the mechanical arm is controlled to move according to the real-time displacement, so that the absolute position of the first image acquisition equipment fixed on the second part is kept unchanged, and the first image acquisition equipment can still be kept stable even under the condition that other parts such as the examination bin and the like vibrate, so that the vibration of the first image acquisition equipment in the high-temperature wind tunnel examination process is effectively inhibited, the quality of the acquired surface image of the tested piece is further improved, an effective measurement means is provided for the high-temperature wind tunnel examination of the material, and the method has important engineering value.

In a possible implementation manner, the obtaining, according to the acceleration at the current time, the displacement of the second portion at the current time, and controlling the motion of the mechanical arm according to the displacement of the second portion at the current time may include: according to the horizontal direction acceleration of the current moment, obtaining the horizontal displacement of the second part of the current moment, and controlling the horizontal direction mechanical arm to generate the displacement with the same size and the opposite direction to the horizontal displacement according to the horizontal displacement of the second part of the current moment; and according to the vertical displacement of the second part at the current moment, controlling the vertical mechanical arm to generate displacement with the same size and the opposite direction to the vertical displacement.

FIG. 2 illustrates a schematic structural diagram of an acceleration sensor according to an embodiment of the present disclosure; as shown in fig. 2, the acceleration sensor (e.g., a horizontal acceleration sensor or a vertical acceleration sensor) may include: the standard mass part, the damper, the elastic element and the displacement sensor. When the environment generates an acceleration a in an acceleration sensitive direction to the acceleration sensor, an inertial force of f ═ ma (m is the mass of the standard mass part) is generated to the standard mass part, and at the moment, an elastic force of f ═ ma ═ kx (k is the elastic coefficient of the elastic element) is generated by the elastic element to ensure the balance of the standard mass part. The damper enables the standard mass part to stay at the current position for a period of time, the change of the length of the elastic element can cause the change of the numerical value of the displacement sensor, and the acceleration in the acceleration sensitive direction can be calculated by utilizing the numerical value change value of the displacement sensor. Such as: when the displacement measured by the displacement sensor is-x, the acceleration of the position of the acceleration sensor in the acceleration sensitive direction can be calculated to be kx/m.

In the embodiment of the disclosure, the acceleration sensor comprises a horizontal acceleration sensor and a vertical acceleration sensor, wherein the acceleration sensitive direction of the horizontal acceleration sensor is the horizontal direction, and the acceleration sensitive direction of the vertical acceleration sensor is the vertical direction; the mechanical arm comprises a vertical mechanical arm and a horizontal mechanical arm, the horizontal acceleration sensor can acquire the acceleration of the second part in the horizontal direction in real time in the high-temperature wind tunnel examination process of the tested piece, and correspondingly, the vertical acceleration sensor can acquire the acceleration of the second part in the vertical direction in real time. The control equipment can reconstruct the horizontal displacement and the vertical displacement of the second part in real time by methods such as a Newmark-beta (Newmark-beta) method and the like according to the acceleration in the horizontal direction and the acceleration in the vertical direction, and further can send a control command to the mechanical arm in the vertical direction and the mechanical arm in the horizontal direction in real time, the mechanical arm in the vertical direction responds to the control command to drive the second part to generate the displacement with the same size and the opposite direction as the vertical displacement in the vertical direction, and correspondingly, the mechanical arm in the horizontal direction responds to the control command to drive the second part to generate the displacement with the same size and the opposite direction as the horizontal displacement in the horizontal direction, so that the position of the first image acquisition equipment is kept unchanged, and the vibration of the first image acquisition equipment is effectively inhibited.

In a possible implementation manner, the obtaining the displacement of the second part at the current time according to the acceleration at the current time includes: obtaining the speed of the second part at the current moment according to the acceleration and the first weight of the acceleration at the current moment, the acceleration and the first weight of the acceleration at the previous moment and the speed of the second part at the previous moment; obtaining the displacement of the second part at the current moment according to the acceleration and the second weight thereof at the current moment, the acceleration and the second weight thereof at the previous moment, the speed of the second part at the previous moment and the displacement of the second part at the previous moment; the first weight of the acceleration at the current moment, the first weight of the acceleration at the previous moment, the second weight of the acceleration at the current moment and the second weight of the acceleration at the previous moment are determined by the change rate of the acceleration at the previous moment. For example, when the change rate of the acceleration at the current time becomes large, the first weight and/or the second weight of the acceleration at the previous time is increased, and the first weight and/or the second weight of the acceleration at the current time is decreased; when the rate of change of the acceleration at the current time is small, the first weight and/or the second weight of the acceleration at the previous time is decreased, and the first weight and/or the second weight of the acceleration at the current time is increased.

The Newmark-beta method is an integral type dynamics numerical analysis method, can be used for solving a numerical discrete method of a time-domain differential equation in dynamics, has the characteristics of high stability and high precision, and also has great advantages in the application of acceleration reconstruction displacement. However, in the process of high-temperature wind tunnel examination of the tested piece, the vibration of the first image acquisition device caused by the high-temperature wind tunnel examination cabin has the characteristics of strong randomness, large change gradient and the like, and the Newmark-beta method takes the parameter alpha as a constant, so that the reconstruction speed and the displacement precision of the tested piece are reduced. FIG. 3 illustrates a schematic diagram of acceleration reconstructed velocity according to an embodiment of the present disclosure; as shown in FIG. 3, in the Newmark- β method the parameter α is 1/2, i.e. the acceleration is considered to be a linear change, a (t)₀) Represents t₀Reference point acceleration at time, a (t)₀+. DELTA t) denotes t₀Reference point acceleration at time + Δ t; when the displacement is reconstructed from the acceleration, consider t₀～t₀The speed variation in time of +. DELTA.t is S_A+S_BWhen the acceleration rate is small, it can be considered to follow a linear change, i.e., S_BIs approximately 0. However, in the high-temperature wind tunnel examination, the acceleration change is violent and does not always follow the linear change rule, and a large error exists between the speed change quantity obtained by adopting a Newmark-beta method and the actual change quantity. Therefore, the embodiment of the disclosure provides an improved Newmark-beta method aiming at the characteristic of severe acceleration change in high-temperature wind tunnel examination.

In the embodiment of the disclosure, the improved Newmark-beta method is shown in the following formulas (1), (2) and (3),

in the equations (1), (2) and (3), v (t) represents the velocity at time t, v (t + Δ t) represents the velocity at time t + Δ t, s (t) represents the displacement at time t, s (t + Δ t) represents the displacement at time t + Δ t, a (t) represents the reference point acceleration at time t, a (t + Δ t) represents the reference point acceleration at time t + Δ t, Δ t represents the time interval, α 'represents the first correction parameter, β' represents the second correction parameter, and α 'and β' represent the parameters in the Newmark- β method.

In the improved Newmark-beta method in the embodiment of the disclosure, a first correction parameter alpha ' and a second correction parameter beta ' are introduced, wherein alpha ' is a first weight of an acceleration a (t + delta t) of a current time t + delta t; 1- α' is the first weight of the acceleration a (t) at the previous time t; β' is the second weight of the acceleration a (t + Δ t) at the current time t + Δ t; 1/2- β' is the second weight of the acceleration a (t) at the previous time t.

As can be seen from equations (2) and (3), the first weight α 'of the acceleration at the current time, the first weight 1- α' of the acceleration at the previous time, the second weight β 'of the acceleration at the current time, and the second weight 1/2- β' of the acceleration at the previous time are determined by the rate of change of the acceleration at the previous time. Referring to equation (2), when the rate of change of the acceleration at the previous time becomes large, the first weight 1- α 'of the acceleration at the previous time is increased, and the first weight α' of the acceleration at the current time is decreased; when the change rate of the acceleration at the current moment becomes smaller, reducing the first weight 1-alpha 'of the acceleration at the previous moment and increasing the first weight alpha' of the acceleration at the current moment; referring to equation (3), when the rate of change of the acceleration at the previous time becomes large, the second weight 1/2- β 'of the acceleration at the previous time is increased and the second weight β' of the acceleration at the current time is decreased; when the rate of change of the acceleration at the previous time becomes small, the second weight 1/2- β 'of the acceleration at the previous time is decreased, and the second weight β' of the acceleration at the current time is increased.

And (2) obtaining the speed v (t + delta t) of the second part of the current time t + delta t according to the acceleration a (t + delta t) of the current time t + delta t and the first weight alpha thereof, the acceleration a (t) of the previous time t and the first weight 1-alpha thereof, and the speed v (t) of the second part of the previous time t by using the formula (1). And obtaining the displacement s (t + delta t) of the second part at the current time t + delta t according to the acceleration a (t + delta t) at the current time t + delta t and the second weight beta thereof, the acceleration a (t) at the previous time t and the second weight 1/2-beta thereof, the speed v (t) of the second part at the previous time t and the displacement s (t) of the second part at the previous time t.

In this way, when the acceleration change rate at a certain moment is increased, the weight of the acceleration at the moment is increased when the speed is reconstructed, so that the error of the acceleration reconstruction speed is reduced, and higher precision is brought; accordingly, when the acceleration change rate at a certain time increases, the weight of the acceleration at that time is increased when reconstructing the displacement, thereby reducing the error of the velocity reconstruction displacement and achieving higher accuracy.

In the embodiment of the disclosure, a Newmark-beta method is improved, and the displacement (or horizontal displacement and vertical displacement) of the second part can be reconstructed in real time by using the improved Newmark-beta method; therefore, the accuracy of the acceleration reconstruction speed and the displacement in the high-temperature wind tunnel test environment is improved.

For example, the control device acquires the acceleration of the second part acquired by the horizontal acceleration sensor and the vertical acceleration sensor in real time, and reconstructs the displacement of the second part at each moment by using the improved Newmark-beta method; and then the horizontal mechanical arm and the vertical mechanical arm are utilized to drive the second part to move, so that the second part generates displacement with the same size and the opposite direction as the reconstructed displacement, the absolute position of the first image acquisition equipment is kept unchanged, and the influence caused by vibration in the high-temperature wind tunnel examination process is greatly reduced. For example, the acceleration of the second part at each moment acquired by the horizontal acceleration sensor and the vertical acceleration sensor may be acquired and recorded as: a is₀,a₁,a₂… …, respectively; a is to₀,a₁By substituting the formula (1), v can be reconstructed₁,s₁(ii) a Using the reconstructed displacement, s₁And sending a control command to the horizontal mechanical arm and the vertical mechanical arm in real time so as to drive the second part to move, for example: if the reconstructed displacement is in the horizontal direction u and the vertical direction v, a control instruction of moving-u is sent to the mechanical arm in the horizontal direction, and a control instruction of moving-v is sent to the mechanical arm in the vertical direction; further, the reconstructed velocity v₁And collected a₁,a₂Substituting into the above formula (1) to reconstruct v₂,s₂And repeatedly executing the operations as follows: and sending control instructions to the horizontal mechanical arm and the vertical mechanical arm in real time by using the reconstructed displacement so as to drive the second part to move. Therefore, the real-time feedback control on the second part can be realized at every moment, so that the influence of the vibration of the high-temperature wind tunnel examination process on the first image acquisition equipment fixedly arranged on the second part is reduced.

In one possible implementation, the control device is further configured to: and calculating the deformation field and/or the temperature field of the surface of the tested piece according to the image of the surface of the tested piece at the current moment.

For example, the deformation field of the surface of the test piece may be calculated by Digital Image Correlation (DIC), and the temperature field of the surface of the test piece may be calculated by colorimetry.

The digital image correlation method has the advantages of non-contact, full-field test, easy operation, good environmental adaptability and the like, and is widely applied to high-temperature wind tunnel test in recent years. And calculating the displacement field and the strain field of the surface of the tested piece according to the acquired images of the surface of the tested piece at different moments.

FIG. 4 is a schematic diagram illustrating deformation of a subregion of an image in a digital image correlation method according to an embodiment of the present disclosure; as shown in fig. 4, the basic principle of the digital image correlation method can be summarized as obtaining images before and after the surface of the tested piece is deformed by an image acquisition device, then obtaining the position of the center point of the sub-area of the image before and after the surface of the tested piece is deformed by a matching algorithm to obtain a displacement field, then obtaining a strain field of the area by a difference algorithm, and obtaining a stress field according to a mechanical theory.

Considering the surface information of the tested piece in the images before and after deformation, taking the central point in the image before deformation as (x, y) and the area with the size of (2M +1) × (2M +1) to define the area as the subarea. And then, similarly searching a region (2M +1) x (2M +1) with the central point (x, y) and the size (x, y) in the deformed image, so that the similarity degree of the sub-regions in the two images before and after deformation is the highest.

Assuming that the central point of the image sub-region before deformation is P (x, y), and the central point of the image sub-region after deformation is P ' (x ', y '), considering only uniform deformation, the deformation u, v of the tested piece in x, y directions can be obtained by the following formula (4):

in the formula, u and v are distances in x and y directions between center points of the sub-regions before and after deformation, respectively, (x and y) are coordinates of the center point P (x and y), and'(x', y ') are coordinates of the center point P' (x ', y').

In more general cases, the test piece may be uniformly deformed or may be non-uniformly deformed. When non-uniform deformation occurs, the shape of the sub-regions also changes greatly. Therefore, when matching the displacements of the two images, the change in shape of the sub-regions is also taken into account, usually expressed as a first order shape function. Selecting a central point P ═ x in the sub-region before deformation_p,y_p) And any point Q ═ x_q,y_q) And then the corresponding point of the sub-area in the deformed image is P' ═ x_p′,y_p') and Q' ═ x_q′,y_q'), the relationship of the corresponding points before and after deformation is determined by the following formula (5):

wherein u and v are the centers of the sub-regions before and after deformationDistance between points in x, y direction, u_x,u_yAnd v_x,v_yThe displacement gradient of the point Q in the x and y directions, respectively, and the distances between the selected point Q and the central point P in the x and y directions are respectively expressed by Deltax and Deltay (x)_p,y_p) Is the coordinate of point P, (x)_q′,y_q') is the coordinates of point Q'.

When the tested piece is under the action of external load, the sub-area on the surface can move and deform along with the tested piece. The sub-regions before and after the deformation are often matched by calculating correlation functions, and the more common correlation functions are: normalized covariance functions, minimum distance sum of squares functions, standard cross correlation functions, etc.

In the embodiment of the disclosure, in the process of the high-temperature wind tunnel examination of the tested piece, the position of the first image acquisition device can be kept unchanged, the higher quality of the acquired surface image of the tested piece is ensured, the difficulty of image post-processing is greatly reduced or image post-processing is not needed, the deformation field and the temperature field of the surface of the tested piece are calculated by using the high-quality surface image of the tested piece, and the calculation accuracy of the deformation field and the temperature field of the surface of the tested piece is ensured.

FIG. 5 shows a block diagram of a device for measuring deformation and temperature in a high temperature wind tunnel environment according to an embodiment of the present disclosure. As shown in fig. 5, the apparatus may include: the high-temperature wind tunnel assessment cabin 101, a first image acquisition device 102, a control device 103, an acceleration sensor 104, a mechanical arm 105, a fixed support 106, a tested piece 107, an observation window 108, a clamping device 109, a compensation light source 110, a filter 111, a mark point 112, a second image acquisition device 113 and a fixing device 114.

The high-temperature wind tunnel assessment cabin 101, the first image acquisition device 102, the control device 103, the acceleration sensor 104, the mechanical arm 105, the fixing support 106, the tested piece 107, the observation window 108, the clamping device 109, the compensation light source 110, and the filter 111 may refer to the same parts in fig. 1, and are not described herein again.

And the mark point 112 is arranged on the second part of the fixed support, the mark point is matched with the second image acquisition equipment for use, and the position of the first image acquisition equipment is acquired in real time through the real-time position of the mark point on the second image acquisition equipment. Illustratively, the marker point may be disposed at an intersection of the second portion and the robotic arm.

The second image acquisition equipment 113 is used for acquiring the images of the mark points, is electrically connected with the control equipment and can transmit the acquired images of the mark points in real time; illustratively, the middle of the lens of the second image pickup device may be directly opposite to the mark point.

And the fixing device 114 is used for fixing the second image acquisition device so that the second image acquisition device is not influenced by the vibration of the high-temperature wind tunnel examination cabin and stably acquires the image of the mark point.

The control device is further configured to: in the process of carrying out high-temperature wind tunnel examination on a tested piece, controlling second image acquisition equipment to acquire an image of a mark point at the current moment; processing the image of the mark point at the current moment to obtain the displacement of the mark point at the current moment (namely the rigid body displacement of the second part at the current moment); and correcting the image of the surface of the tested piece at the current moment according to the displacement of the marking point at the current moment, so as to obtain the corrected image of the surface of the tested piece at the current moment.

In the embodiment of the present disclosure, on the basis of the above-mentioned feedback control by the mechanical arm greatly reducing the vibration of the first image capturing device, a certain time delay is considered in signal transmission, so as to further avoid the minute vibration of the first image capturing device. And adding mark points on the second part, and in the process of carrying out high-temperature wind tunnel assessment on the tested piece, utilizing a third image acquisition device to acquire the positions of the mark points in real time, and reconstructing the displacement of the mark points at the current moment, namely the rigid body displacement of the second part at the current moment, by a mark point matching algorithm. The first image acquisition equipment and the second part are fixedly connected into a whole and are influenced by wind tunnel vibration, so that the first image acquisition equipment can be regarded as rigid translation. Therefore, the displacement of the marker point may represent the displacement of the first image capturing device due to vibration; and correcting and acquiring the image of the surface of the tested piece at the corresponding moment by using the measured displacement of the mark point, thereby further eliminating the influence on the quality of the acquired image of the surface of the tested piece caused by the vibration of the wind tunnel.

Illustratively, FIG. 6 shows a schematic diagram of a landmark matching computation displacement according to an embodiment of the present disclosure; as shown in fig. 6, obtaining the position of the marker point (as point a in fig. 6) before the high temperature wind tunnel assessment test; the method comprises the steps of acquiring the position of a mark point at the current moment in real time in the high-temperature wind tunnel assessment process (such as a point B in figure 6); by A point coordinate (x)_A,y_A) And coordinates (x) of point B_B,y_B) Calculating the displacement of the mark point at the current moment (namely the rigid body displacement of the second part at the current moment), wherein the displacement of the mark point at the current moment is a displacement which is generated by the first image acquisition equipment at the current moment due to wind tunnel vibration because the first image acquisition equipment is fixedly connected with the second part into a whole, for example: Δ x ═ x_B-x_A，Δy＝y_B-y_A(ii) a And correcting the acquired image of the surface of the tested piece at the current moment by using the calculated displacement of the first image acquisition equipment at the current moment, and illustratively, translating the acquired image of the surface of the tested piece by-delta x pixels along the horizontal direction and translating by-delta y pixels along the vertical direction to obtain the corrected image of the surface of the tested piece at the current moment.

Illustratively, the deformation field of the surface of the tested piece can be calculated by a digital image correlation method according to the corrected image of the surface of the tested piece; the temperature field of the surface of the test piece can be calculated by colorimetry according to the corrected image of the surface of the test piece. The detailed description may refer to the above related description, and will not be repeated herein.

In this way, in the embodiment of the application, the second part is provided with the mark points, and images of the mark points are collected in the process of carrying out high-temperature wind tunnel assessment on the tested piece, so that the position information of the first image collecting device is synchronously obtained, the displacement of the first image collecting device at each moment is calculated by utilizing a mark point matching algorithm, the collected images of the surface of the tested piece at the corresponding moment are corrected, and the further improvement of the imaging quality is realized; the high-quality image of the surface of the tested piece can greatly improve the measurement precision of the surface appearance of the tested piece and the calculation precision of the deformation field and the temperature field.

It should be noted that, although the above embodiments are described as examples of the deformation and temperature measurement device in the high temperature wind tunnel environment, those skilled in the art can understand that the disclosure should not be limited thereto. In fact, each implementation mode can be flexibly set according to the actual application scene as long as the technical scheme of the present disclosure is met.

Thus, in the embodiment of the present disclosure, the fixing bracket includes a first portion and a second portion, and the first portion and the second portion are connected through a mechanical arm; the first part is connected with the high-temperature wind tunnel examination bin, and the second part is fixedly provided with a first image acquisition device and an acceleration sensor. In the high-temperature wind tunnel assessment process of a tested piece in the high-temperature wind tunnel assessment bin, the control device controls the acceleration sensor to acquire the acceleration of a second part at the current moment and controls the first image acquisition device to acquire an image of the surface of the tested piece at the current moment; the displacement of the second part at the current moment is obtained according to the acceleration at the current moment, and the movement of the mechanical arm is controlled according to the displacement of the second part at the current moment, so that the position of the first image acquisition device is kept unchanged, and the first image acquisition device can still be kept stable even under the condition that other parts such as the examination bin and the like vibrate, so that the vibration of the first image acquisition device in the high-temperature wind tunnel examination process is effectively inhibited, the quality of the acquired surface image of the tested piece is improved, an effective measurement means is provided for the high-temperature wind tunnel examination of the material, and the device has important engineering value.

Fig. 7 is a flowchart illustrating a method for measuring deformation and temperature in a high temperature wind tunnel environment, which is applied to the deformation and temperature measuring apparatus in the high temperature wind tunnel environment of fig. 1 or 5, according to an embodiment of the present disclosure, and an executing body of the method may be the control device of fig. 1 or 5; as shown in fig. 7, the method may include:

step 701, in the process of carrying out high-temperature wind tunnel assessment on the tested piece, controlling an acceleration sensor to acquire the acceleration of the second part at the current moment, and controlling a first image acquisition device to acquire the image of the surface of the tested piece at the current moment.

Step 702, obtaining the displacement of the second part at the current moment according to the acceleration of the second part at the current moment, and controlling the motion of the mechanical arm according to the displacement of the second part at the current moment, so as to keep the position of the first image acquisition device unchanged.

In a possible implementation manner, the obtaining the displacement of the second part at the current time according to the acceleration at the current time may include: obtaining the speed of the second part at the current moment according to the acceleration and the first weight of the acceleration at the current moment, the acceleration and the first weight of the acceleration at the previous moment and the speed of the second part at the previous moment; obtaining the displacement of the second part at the current moment according to the acceleration and the second weight of the acceleration at the current moment, the acceleration and the second weight of the acceleration at the previous moment, the speed of the second part at the previous moment and the displacement of the second part at the previous moment; the first weight of the acceleration at the current moment, the first weight of the acceleration at the previous moment, the second weight of the acceleration at the current moment and the second weight of the acceleration at the previous moment are determined by the change rate of the acceleration at the previous moment.

In one possible implementation manner, the determining the first weight of the acceleration at the current time, the first weight of the acceleration at the previous time, the second weight of the acceleration at the current time, and the second weight of the acceleration at the previous time by the change rate of the acceleration at the previous time includes: when the change rate of the acceleration at the current moment is larger, increasing the first weight and/or the second weight of the acceleration at the previous moment, and reducing the first weight and/or the second weight of the acceleration at the current moment; when the rate of change of the acceleration at the current time is small, the first weight and/or the second weight of the acceleration at the previous time is decreased, and the first weight and/or the second weight of the acceleration at the current time is increased.

In one possible implementation, the method further includes: in the process of carrying out high-temperature wind tunnel examination on a tested piece, controlling second image acquisition equipment to acquire an image of a mark point at the current moment; processing the image of the mark point at the current moment to obtain the displacement of the mark point at the current moment (namely the rigid body displacement of the second part at the current moment); and correcting the image of the surface of the tested piece at the current moment according to the displacement of the marking point at the current moment.

In a possible implementation manner, the obtaining, according to the acceleration at the current time, the displacement of the second portion at the current time, and controlling the motion of the mechanical arm according to the displacement of the second portion at the current time may include: according to the horizontal direction acceleration of the current moment, obtaining the horizontal displacement of a second part at the current moment, and controlling a horizontal direction mechanical arm to generate displacement with the same size and the opposite direction as the horizontal displacement according to the horizontal displacement of the second part at the current moment; and according to the vertical displacement of the second part at the current moment, controlling the vertical mechanical arm to generate displacement with the same size and the opposite direction to the vertical displacement.

In one possible implementation, the method further includes: and calculating the deformation field and/or the temperature field of the surface of the tested piece according to the corrected image of the surface of the tested piece at the current moment.

For example, fig. 8 shows a flowchart of a method for measuring deformation and temperature in a high temperature wind tunnel environment, which is applied to the above-mentioned deformation and temperature measuring device in a high temperature wind tunnel environment in fig. 1 or fig. 5, and as shown in fig. 8, the method may include:

step 801, installing a to-be-tested piece in a high-temperature wind tunnel examination cabin, adding a mark point at a preset position, and checking the positions of a first image acquisition device, a second image acquisition device, an acceleration sensor and the like.

Step 802, connecting each device, turning on a compensation light source, simultaneously turning on a first image acquisition device and a second image acquisition device for image acquisition, then starting a high-temperature wind tunnel examination in a high-temperature wind tunnel examination cabin, and acquiring an image of the surface of a tested piece in real time by the first image acquisition device and transmitting the image to a control device in real time; and the second image acquisition equipment acquires the images of the mark points in real time and transmits the images to the control equipment in real time.

Step 803, the horizontal acceleration sensor and the vertical acceleration sensor acquire the acceleration of the second part in real time and transmit the acceleration to the control device in real time, and the control device reconstructs the displacement of the second part in the horizontal direction and the displacement of the second part in the vertical direction in real time by using an improved Newmark-beta method in the formulas (1) to (3).

And step 804, the control device controls the horizontal mechanical arm and the vertical mechanical arm to move in real time by using the reconstructed horizontal displacement and the reconstructed vertical displacement, so that the influence of the vibration of the first image acquisition device on the acquired surface image of the tested piece, which is caused by the vibration of the wind tunnel, is reduced.

And 805, finishing the high-temperature wind tunnel examination, closing the equipment, and storing the images acquired by the first image acquisition equipment and the second image acquisition equipment.

And 806, calculating the displacement of the mark point at each moment by using the mark point image set acquired by the second image acquisition equipment and adopting the mark point matching algorithm, namely, the displacement represents the rigid displacement of the first image acquisition equipment fixedly connected with the mark point image set.

And 807, correcting the image of the surface of the tested piece at the corresponding moment acquired by the first image acquisition equipment by using the calculated mark point displacement at each moment, thereby further eliminating the influence of the wind tunnel vibration on the quality of the acquired image of the surface of the tested piece and obtaining the high-quality image of the surface of the tested piece at each moment.

And 808, calculating the deformation field by a digital image correlation method by using the high-quality image of the surface of the tested piece.

Through the steps 801 and 808, the state information of the first image acquisition equipment is acquired in real time by using the acceleration sensor, the high-precision reconstruction from acceleration to displacement is realized by using an improved Newmark-beta method, and the position of the first image acquisition equipment is controlled by using the mechanical arm feedback, so that the influence of the vibration of the first image acquisition equipment by the wind tunnel is effectively inhibited, and the real-time acquisition of the high-quality image on the surface of the tested piece is realized.

It should be noted that, although the deformation and temperature measurement method in the high temperature wind tunnel environment is described above by taking the above embodiment as an example, those skilled in the art can understand that the disclosure should not be limited thereto. In fact, each implementation mode can be flexibly set according to the actual application scene as long as the technical scheme of the present disclosure is met.

The embodiment of the present disclosure also provides a device for measuring deformation and temperature in a high temperature wind tunnel environment, including: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to perform the above method.

The disclosed embodiments also provide a non-transitory computer-readable storage medium having stored thereon computer program instructions, wherein the computer program instructions, when executed by a processor, implement the above-described method.

FIG. 9 shows a block diagram of an apparatus 1900 for deformation and temperature measurement in a high temperature wind tunnel environment, according to an embodiment of the present disclosure. For example, the apparatus 1900 may be provided as a server. Referring to fig. 9, the device 1900 includes a processing component 1922 further including one or more processors and memory resources, represented by memory 1932, for storing instructions, e.g., applications, executable by the processing component 1922. The application programs stored in memory 1932 may include one or more modules that each correspond to a set of instructions. Further, the processing component 1922 is configured to execute instructions to perform the above-described method.

The device 1900 may also include a power component 1926 configured to perform power management of the device 1900, a wired or wireless network interface 1950 configured to connect the device 1900 to a network, and an input/output (I/O) interface 1958. The device 1900 may operate based on an operating system stored in memory 1932, such as Windows Server, Mac OS XTM, UnixTM, LinuxTM, FreeBSDTM, or the like.

In an exemplary embodiment, a non-transitory computer readable storage medium, such as the memory 1932, is also provided that includes computer program instructions executable by the processing component 1922 of the apparatus 1900 to perform the above-described methods.

The present disclosure may be systems, methods, and/or computer program products. The computer program product may include a computer-readable storage medium having computer-readable program instructions embodied thereon for causing a processor to implement various aspects of the present disclosure.

The computer readable storage medium may be a tangible device that can hold and store the instructions for use by the instruction execution device. The computer readable storage medium may be, for example, but not limited to, an electronic memory device, a magnetic memory device, an optical memory device, an electromagnetic memory device, a semiconductor memory device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a Static Random Access Memory (SRAM), a portable compact disc read-only memory (CD-ROM), a Digital Versatile Disc (DVD), a memory stick, a floppy disk, a mechanical coding device, such as punch cards or in-groove projection structures having instructions stored thereon, and any suitable combination of the foregoing. Computer-readable storage media as used herein is not to be construed as transitory signals per se, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through a waveguide or other transmission medium (e.g., optical pulses through a fiber optic cable), or electrical signals transmitted through electrical wires.

The computer-readable program instructions described herein may be downloaded from a computer-readable storage medium to a respective computing/processing device, or to an external computer or external storage device via a network, such as the internet, a local area network, a wide area network, and/or a wireless network. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers and/or edge servers. The network adapter card or network interface in each computing/processing device receives computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in a computer-readable storage medium in the respective computing/processing device.

The computer program instructions for carrying out operations of the present disclosure may be assembler instructions, Instruction Set Architecture (ISA) instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source or object code written in any combination of one or more programming languages, including an object oriented programming language such as Smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider). In some embodiments, the electronic circuitry that can execute the computer-readable program instructions implements aspects of the present disclosure by utilizing the state information of the computer-readable program instructions to personalize the electronic circuitry, such as a programmable logic circuit, a Field Programmable Gate Array (FPGA), or a Programmable Logic Array (PLA).

Various aspects of the present disclosure are described herein with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the disclosure. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer-readable program instructions.

These computer-readable program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. These computer-readable program instructions may also be stored in a computer-readable storage medium that can direct a computer, programmable data processing apparatus, and/or other devices to function in a particular manner, such that the computer-readable medium storing the instructions comprises an article of manufacture including instructions which implement the function/act specified in the flowchart and/or block diagram block or blocks.

The computer readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the instructions which execute on the computer, other programmable apparatus or other devices implement the functions/acts specified in the flowchart and/or block diagram block or blocks.

The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of instructions, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A device for measuring deformation and temperature in a high temperature wind tunnel environment, the device comprising: the system comprises a high-temperature wind tunnel examination cabin, a first image acquisition device, a control device, an acceleration sensor, a mechanical arm and a fixed support; wherein,

a tested piece is fixed in the closed space of the high-temperature wind tunnel examination cabin, and an observation window is arranged on the high-temperature wind tunnel examination cabin; the high-temperature wind tunnel examination cabin is used for carrying out high-temperature wind tunnel examination on the tested piece;

the fixed bracket comprises a first part and a second part, and the first part and the second part are connected through the mechanical arm; the first part is connected with the high-temperature wind tunnel examination bin; the second part is fixedly provided with the first image acquisition equipment and the acceleration sensor;

the first image acquisition equipment is used for acquiring an image of the surface of the tested piece through the observation window;

the acceleration sensor is used for acquiring the acceleration of the second part;

the mechanical arm is used for adjusting the position of the first image acquisition equipment;

the control device is electrically connected to the first image acquisition device, the acceleration sensor and the mechanical arm, and the control device is used for:

in the process of carrying out high-temperature wind tunnel examination on the tested piece, controlling the acceleration sensor to acquire the acceleration at the current moment, and controlling the first image acquisition equipment to acquire the image of the surface of the tested piece at the current moment;

obtaining the displacement of the second part at the current moment according to the acceleration at the current moment, and controlling the mechanical arm to move according to the displacement of the second part at the current moment so as to keep the position of the first image acquisition equipment unchanged;

the obtaining of the displacement of the second part at the current moment according to the acceleration at the current moment includes:

obtaining the speed of the second part at the current moment according to the acceleration and the first weight of the acceleration at the current moment, the acceleration and the first weight of the acceleration at the previous moment and the speed of the second part at the previous moment;

obtaining the displacement of the second part at the current moment according to the acceleration and the second weight of the acceleration at the current moment, the acceleration and the second weight of the acceleration at the previous moment, the speed of the second part at the previous moment and the displacement of the second part at the previous moment;

wherein the first weight of the acceleration at the current time, the first weight of the acceleration at the previous time, the second weight of the acceleration at the current time, and the second weight of the acceleration at the previous time are determined by a rate of change of the acceleration at the previous time.

2. The apparatus of claim 1, wherein the first weight of the acceleration at the current time, the first weight of the acceleration at the previous time, the second weight of the acceleration at the current time, and the second weight of the acceleration at the previous time are determined by a rate of change of the acceleration at the previous time, and wherein the method comprises:

when the change rate of the acceleration at the previous moment is larger, increasing the first weight and/or the second weight of the acceleration at the previous moment, and reducing the first weight and/or the second weight of the acceleration at the current moment;

when the change rate of the acceleration at the previous time becomes small, the first weight and/or the second weight of the acceleration at the previous time is/are decreased, and the first weight and/or the second weight of the acceleration at the current time is increased.

3. A device according to claim 1 or 2, wherein the second portion has a marker point disposed thereon;

the device further comprises: the second image acquisition equipment is used for acquiring the image of the mark point;

the control device is further configured to:

in the process of carrying out high-temperature wind tunnel examination on the tested piece, controlling the second image acquisition equipment to acquire the image of the mark point at the current moment;

processing the image of the mark point at the current moment to obtain the displacement of the mark point at the current moment;

and correcting the image of the surface of the tested piece at the current moment according to the displacement of the mark point at the current moment.

4. The apparatus of claim 1, wherein the acceleration sensor comprises a horizontal acceleration sensor and a vertical acceleration sensor; the horizontal acceleration sensor is used for acquiring acceleration in the horizontal direction, and the vertical acceleration sensor is used for acquiring acceleration in the vertical direction;

the mechanical arm comprises; a horizontal direction mechanical arm and a vertical direction mechanical arm;

the obtaining of the displacement of the second part at the current moment according to the acceleration at the current moment, and controlling the movement of the mechanical arm according to the displacement of the second part at the current moment, includes:

obtaining the horizontal displacement of the second part at the current moment according to the horizontal acceleration at the current moment, and controlling the horizontal mechanical arm to generate displacement with the same size and the opposite direction to the horizontal displacement according to the horizontal displacement of the second part at the current moment;

and according to the vertical direction acceleration of the current moment, obtaining the vertical displacement of the second part at the current moment, and according to the vertical displacement of the second part at the current moment, controlling the vertical direction mechanical arm to generate displacement with the same size and the opposite direction of the vertical displacement.

5. The apparatus of claim 3, wherein the control device is further configured to: and calculating the deformation field and/or the temperature field of the surface of the tested piece according to the corrected image of the surface of the tested piece at the current moment.

6. The apparatus of claim 1, further comprising: a compensating light source, a clamping device;

the compensation light source is used for compensating the ambient light in the high-temperature wind tunnel examination core;

the clamping device is used for fixing the tested piece in the high-temperature wind tunnel examination cabin;

the first image acquisition equipment is provided with a filter, and the filter is matched with the compensation light source for use.

7. A method for measuring deformation and temperature in a high-temperature wind tunnel environment, which is characterized by being applied to the device of any one of claims 1 to 6; the method comprises the following steps:

obtaining the displacement of the second part at the current moment according to the acceleration of the second part at the current moment, and controlling the movement of the mechanical arm according to the displacement of the second part at the current moment so as to keep the position of the first image acquisition equipment unchanged;

the obtaining of the displacement of the second part at the current time according to the acceleration of the second part at the current time includes:

obtaining the speed of the second part at the current moment according to the acceleration and the first weight of the second part at the current moment, the acceleration and the first weight of the acceleration at the previous moment and the speed of the second part at the previous moment;

obtaining the displacement of the second part at the current moment according to the acceleration and the second weight of the second part at the current moment, the acceleration and the second weight of the acceleration at the previous moment, the speed of the second part at the previous moment and the displacement of the second part at the previous moment;

wherein the first weight of the acceleration of the second portion at the current time, the first weight of the acceleration of the previous time, the second weight of the acceleration of the second portion at the current time, and the second weight of the acceleration of the previous time are determined by a rate of change of the acceleration of the previous time.

8. A deformation and temperature measuring device under high-temperature wind tunnel environment is characterized by comprising:

a processor;

a memory for storing processor-executable instructions;

wherein the processor is configured to implement the method of claim 7 when executing the memory-stored executable instructions.

9. A non-transitory computer readable storage medium having computer program instructions stored thereon, wherein the computer program instructions, when executed by a processor, implement the method of claim 7.