CN114964683B - Rotor wing type pitching and translating composite vibration test device and application method - Google Patents
Rotor wing type pitching and translating composite vibration test device and application method Download PDFInfo
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- CN114964683B CN114964683B CN202210902055.6A CN202210902055A CN114964683B CN 114964683 B CN114964683 B CN 114964683B CN 202210902055 A CN202210902055 A CN 202210902055A CN 114964683 B CN114964683 B CN 114964683B
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- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/06—Multidirectional test stands
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/022—Vibration control arrangements, e.g. for generating random vibrations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
A rotor wing type pitching and translating composite vibration test device and a using method belong to the technical field of special test of an aeronautical power wind tunnel. The invention solves the problem that the existing pitching and translating vibration test device adopts a motion mechanism in a serial motion form in a high-speed wind tunnel and is difficult to meet the test requirement. The wind tunnel model comprises a model, a model supporting shaft, a rotating window and a driving mechanism, wherein the model is arranged on the inner side of the wind tunnel side wall, the rotating window is installed on the wind tunnel side wall, the driving mechanism is arranged on the outer side of the wind tunnel side wall, a first sliding groove is machined in the rotating window, the model supporting shaft penetrates through the first sliding groove to be connected with the model, the driving mechanism comprises a pitching driving mechanism and a translation driving mechanism, and the pitching driving mechanism and the translation driving mechanism are respectively connected with the model supporting shaft. The composite vibration device and the use method can realize the independent pitching and translation of the airfoil model and the pitching and translation composite vibration test in the high-speed wind tunnel, have low required driving moment and can meet the test requirement.
Description
Technical Field
The invention belongs to the technical field of special tests of an aerodynamic wind tunnel, and particularly relates to a rotor wing type pitching and translating composite vibration test device and a using method thereof.
Background
The appearance design of the helicopter rotor is based on the cascade theory and is based on the aerodynamic characteristics of an airfoil profile, and blades are integrally designed. Whether the aerodynamic performance of the airfoil is excellent or not is a key factor of the blade performance. In the past, the aerodynamic performance of the airfoil mainly focuses on the static aerodynamic performance of the airfoil, and the dynamic aerodynamic performance is rarely focused. The static aerodynamic performance of the wing profile is mainly obtained by a static wing profile force measurement and pressure measurement test in a wind tunnel;
as helicopters become more and more high in speed, the aerodynamic characteristics of the helicopter rotor airfoil profile that appear in rotation become more and more important. During rotation, the helicopter rotor undergoes up-and-down flapping, pitch-and-lag (pitching), and pitch-changing motions in each rotation cycle. For each airfoil section, the motion of the airfoil relative to the free incoming flow is: up-down translational vibration, front-back translational vibration, and variable angle of attack (pitch angle) vibration, as shown in fig. 5-6;
the three motions of the wing profile are required to be simulated in a wind tunnel for accurately acquiring the dynamic aerodynamic performance of the wing profile of the rotor, generally, the dynamic effect of the front and back motions of the wing profile is not obvious, and the up and down translational vibration and the variable attack angle vibration are mainly concerned. In order to obtain the dynamic aerodynamic characteristics of the wing profile of the rotor, a pitching and translational vibration test device of the wing profile of the rotor needs to be developed in a wind tunnel to realize the vibration of a model and measure the dynamic aerodynamic force in the vibration process;
because the aerodynamic load in the high-speed wind tunnel is large, the realization of the vibration of the model has technical difficulties, the pitching and translation compound vibration of the model needs to be realized, and the technical difficulties are high;
the existing pitching and translational vibration test device mostly adopts a series connection motion mode, namely, the whole mechanism performs translational vibration, the pitching mechanism is located on the translational mechanism, the translational mechanism bears the loads of the model and the pitching mechanism, and the driving load is large. However, in a high-speed wind tunnel, due to the limitation of space size, the driving power cannot be infinitely increased, so that a motion mechanism adopting a serial motion form in the high-speed wind tunnel hardly meets the test requirements;
in view of the above problems, a parallel motion mode is needed to achieve compound pitching and translational vibration of the wing profile of the rotor, and to achieve independent pitching or translational vibration of the wing profile of the rotor.
Disclosure of Invention
The present invention has been developed in order to solve the above-mentioned technical problems, and a brief summary of the present invention is given below in order to provide a basic understanding of some aspects of the present invention. It should be understood that this summary is not an exhaustive overview of the invention. It is not intended to determine the key or important part of the present invention, nor is it intended to limit the scope of the present invention.
The technical scheme of the invention is as follows:
the first scheme is as follows: the utility model provides a rotor wing section every single move and compound vibration test device of translation, which comprises a model, the model back shaft, change window and actuating mechanism, the model setting is inboard at the wind-tunnel lateral wall, it installs on the wind-tunnel lateral wall to change the window, actuating mechanism sets up in the wind-tunnel lateral wall outside, it has first spout to process on the window to change, first spout vertically sets up on changing the window, model back shaft sliding connection is on first spout, the model back shaft passes first spout and is connected with model establishment, actuating mechanism includes every single move actuating mechanism and translation actuating mechanism, every single move actuating mechanism and translation actuating mechanism establish with the model back shaft respectively and be connected.
Furthermore, the pitching driving mechanism comprises a pitching motor, a pitching speed reducer, a first eccentric wheel, a first sliding block, a first sliding rail, a rack and a gear, the pitching motor is connected with the first eccentric wheel through the pitching speed reducer, the first eccentric wheel is connected with the first sliding block, the first sliding block is slidably mounted on the first sliding rail, the first sliding rail is vertically arranged on the rotating window, the rack is arranged on the first sliding block, the rack is arranged in parallel with the first sliding rail, the rack is meshed with the gear, and the gear is sleeved on the model supporting shaft.
Furthermore, a first fixing rod is arranged on the first eccentric wheel, a second sliding groove is transversely processed on the side wall of the first sliding block, and the first fixing rod is arranged in the second sliding groove in a sliding mode.
Furthermore, the translation driving mechanism comprises a translation motor, a translation speed reducer, a second eccentric wheel, a second sliding block and a second sliding rail, the translation motor is connected with the second eccentric wheel through the translation speed reducer, the second eccentric wheel is connected with the second sliding block, the second sliding block is arranged on the second sliding rail in a sliding mode, the second sliding rail is vertically arranged on the rotating window, and the second sliding block is detachably connected with the model supporting shaft.
Furthermore, a second fixing rod is arranged on the second eccentric wheel, a third sliding groove is transversely processed on the side wall of the second sliding block, and the second fixing rod is arranged in the third sliding groove in a sliding manner.
Scheme two is as follows: the application method of the rotor wing profile pitching and translating compound vibration testing device based on the first scheme comprises the following three vibration states:
individual pitch vibration: the rolling motion between the model supporting shaft and the second sliding block is limited and released, the model supporting shaft freely rotates in the second sliding block, the pitching motor drives the first eccentric wheel to continuously rotate through the pitching speed reducer, the first eccentric wheel drives the first sliding block to move up and down on the first sliding rail, and the rack on the first sliding block moves up and down to drive the gear to do sinusoidal vibration so as to drive the model to do sinusoidal pitching vibration;
when the model vibrates in a single pitching mode, the motion rule of the attack angle of the model is as follows:
α(t)＝α mean +α amp sin(2πf 1 t)
where α (t) is the attack angle of the model at time t, t is the time, and α is the point where the vibration start time of the model is 0 mean Is the average angle of attack; alpha (alpha) ("alpha") amp The amplitude is the pitching vibration angle amplitude; f. of 1 Is the pitch vibration frequency;
individual translational vibration: the rolling motion between the model supporting shaft and the second sliding block is limited, the model supporting shaft and the second sliding block are fixedly connected, the gear and the rack are separated, the translation motor drives the second eccentric wheel to continuously rotate through the translation reducer, the second sliding block is driven to move up and down, and the model is driven to perform up-and-down translation vibration through the second sliding block;
when the model is subjected to independent translational vibration, the motion rule of the displacement in the vertical direction of the model is as follows:
y(t)＝y amp sin(2πf 2 t)
wherein y (t) is the vertical displacement of the model at time t, y amp Is the translational vibration displacement amplitude; f. of 2 Is the translational vibration frequency; t is time, and the vibration starting moment of the model is 0 point;
pitching and translation compound vibration:
the rolling motion between the model supporting shaft and the second sliding block is limited and released, the gear and the rack are meshed, the pitching motor and the translation motor are started simultaneously, the model performs pitching and translation compound motion under the driving of the first eccentric wheel and the second eccentric wheel, and the pitching vibration frequency is the same as the translation vibration frequency;
when the model vibrates compositely, the motion rule of the attack angle of the model is as follows:
α(t)＝α mean +α amp sin(2πf 3 t)
where α (t) is the model angle of attack at time t, α mean Is the average angle of attack; alpha is alpha amp The amplitude is the pitching vibration angle amplitude; f. of 3 Is the pitching vibration frequency; t is time, and the vibration starting moment of the model is 0 point;
when the model vibrates compositely, the motion rule of the displacement of the model in the vertical direction is as follows:
wherein y (t) is the vertical displacement of the model at time t, y amp Is the translational vibration displacement amplitude; f. of 4 Is the translational vibration frequency, f 3 ＝f 4 (ii) a Phi is a phase angle between translational motion and pitching vibration; t is time, and the time when the model starts to vibrate is 0.
The invention has the following beneficial effects:
1. the rotor wing profile pitching and translating composite vibration test device and the use method can realize independent pitching and translating and pitching and translating composite vibration tests of the model in a high-speed wind tunnel, the motions in the pitching direction and the translating direction are in a parallel connection relation, the required driving moment is low, and the test requirements can be met;
2. the rotor wing profile pitching and translating composite vibration test device has the advantages that the phase angle between two motions can be adjusted, the adjustment is simple, the phase angle is easy to maintain and is not easy to change;
3. the pitching vibration frequency of the rotor wing profile pitching and translating composite vibration testing device can reach 10 Hz, the angular amplitude can reach 10 degrees, and the translating vibration amplitude can reach 50 mm.
Drawings
FIG. 1 is a diagram of the overall structural layout of a rotor wing profile pitch and translation compound vibration test device;
FIG. 2 is a schematic view of a drive mechanism;
FIG. 3 is a partial schematic view of FIG. 2;
FIG. 4 is an isometric view of the drive mechanism;
FIG. 5 is a schematic diagram of the pitching vibration, the translation vibration and the compound vibration states of the model;
FIG. 6 is a schematic representation of three movements of the model in a wind tunnel;
FIG. 7 is a graph of the change in angle of attack with time for the model in example 2;
FIG. 8 is a graph of displacement versus time for the model in example 3;
fig. 9 is a graph of the change in angle of attack and displacement with time for the model in example 4.
In the figure, 1-a pitching motor, 2-a pitching reducer, 3-a first eccentric wheel, 4-a first sliding block, 5-a first sliding rail, 6-a rack, 7-a gear, 8-a model, 9-a translation motor, 10-a translation reducer, 11-a second eccentric wheel, 12-a second sliding block, 13-a second sliding rail, 14-a model supporting shaft, 15-a first sliding chute, 16-a first fixing rod, 17-a second sliding chute, 18-a second fixing rod, 19-a third sliding chute, 20-a rotating window, 21-a driving mechanism and 22-a wind tunnel side wall.
Detailed Description
In order that the objects, aspects and advantages of the invention will become more apparent, the invention will be described by way of example only, and with reference to the accompanying drawings. It is to be understood that such description is merely illustrative and not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The connection mentioned in the present invention is divided into a fixed connection and a detachable connection, the fixed connection (i.e. the non-detachable connection) includes but is not limited to a folding connection, a rivet connection, an adhesive connection, a welding connection, and other conventional fixed connection methods, the detachable connection includes but is not limited to a screw connection, a snap connection, a pin connection, a hinge connection, and other conventional detachment methods, when the specific connection method is not clearly defined, the function can be realized by always finding at least one connection method from the existing connection methods by default, and a person skilled in the art can select the connection method according to needs. For example: the fixed connection selects welding connection, and the detachable connection selects hinge connection.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
the pitching driving mechanism comprises a pitching motor 1, a pitching reducer 2, a first eccentric wheel 3, a first sliding block 4, a first sliding rail 5, a rack 6 and a gear 7, wherein the pitching motor 1 is connected with the first eccentric wheel 3 through the pitching reducer 2, the first eccentric wheel 3 is driven to rotate under the action of the pitching motor 1, a first fixing rod 16 is arranged on the first eccentric wheel 3, a second sliding groove 17 is transversely processed on the side wall of the first sliding block 4, the first fixing rod 16 is slidably arranged in the second sliding groove 17, the first sliding block 4 is slidably arranged on the first sliding rail 5, the first sliding rail 5 is vertically arranged on a rotating window 20, when the first eccentric wheel 3 rotates, the first sliding block 4 is driven to reciprocate up and down, the rack 6 is arranged on the first sliding block 4, the rack 6 is arranged in parallel to the first sliding rail 5, the model supporting shaft 14 is sleeved with the gear 7, the rack 6 is meshed with the gear 7, and when the first sliding block 4 reciprocates up and down, the rack 6 is driven to rotate, the gear 7 is fixedly connected with the model supporting shaft 14, and the model 8 vibrates in pitching mode along with the pitching supporting shaft;
the translation driving mechanism comprises a translation motor 9, a translation reducer 10, a second eccentric wheel 11, a second sliding block 12 and a second sliding rail 13, the translation motor 9 is connected with the second eccentric wheel 11 through the translation reducer 10, the second eccentric wheel 11 is driven to rotate under the action of the translation motor 9, a second fixing rod 18 is installed on the second eccentric wheel 11, a third sliding groove 19 is transversely machined on the side wall of the second sliding block 12, the second fixing rod 18 is slidably arranged in the third sliding groove 19, the second sliding block 12 is slidably installed on the second sliding rail 13, the second sliding rail 13 is vertically installed on a rotating window 20, the second sliding block 12 is detachably connected with a model supporting shaft 14, and when the second eccentric wheel 11 rotates, the second sliding block 12 does translation motion in the vertical direction under the constraint of the second sliding rail 13, so that the model supporting shaft 14 is driven to do translation motion in the first sliding groove 15, and the model 8 does translation motion accordingly.
when the model is singly vibrated in a pitching mode, the motion rule of the attack angle of the model is as follows:
α(t)＝α mean +α amp sin(2πf 1 t)
where α (t) is the attack angle of the model 8 at time t, t is time, and α is a point 0 at the time when the model 8 starts to vibrate mean Is the average angle of attack; alpha is alpha amp The amplitude is the pitching vibration angle amplitude; f. of 1 Is the pitching vibration frequency;
in a typical test state, the model 8 makes pitching vibration with amplitude of 10 degrees at an average angle of attack of 5 degrees, and the pitching vibration frequency is 5 hertz, so that the equation of the angle of attack vibration of the model 8 is as follows:
α(t)＝5°+10°sin(2π×5Hz×t)
when the model is subjected to independent translational vibration, the motion rule of the model 8 in the vertical direction displacement is as follows:
y(t)＝y amp sin(2πf 2 t)
where y (t) is the vertical displacement of the model 8 at time t, y amp Is the translational vibration displacement amplitude; f. of 2 Is the translational vibration frequency; t is time, and the vibration starting moment of the model is 0 point;
in a typical test state, when the model 8 performs translational vibration with the amplitude of 50 mm and the translational vibration frequency is 5 Hz, the translational vibration equation of the model 8 is as follows:
y(t)＝50mm×sin(2π×5Hz×t)
example 4: the embodiment is described with reference to fig. 1-4 and 9, the pitching and translating compound vibration method of the rotor wing profile pitching and translating compound vibration testing apparatus of the embodiment,
the rolling motion between the model supporting shaft 14 and the second sliding block 12 is limited and released, the gear 7 is meshed with the rack 6, the pitching motor 1 and the translation motor 9 are started simultaneously, the model 8 performs pitching and translation compound motion under the driving of the first eccentric wheel 3 and the second eccentric wheel 11, and the pitching vibration frequency is the same as the translation vibration frequency;
when the model 8 vibrates compositely, the motion law of the attack angle of the model 8 is as follows:
α(t)＝α mean +α amp sin(2πf 3 t)
where α (t) is the angle of attack of model 8 at time t, α mean Is the average angle of attack; alpha (alpha) ("alpha") amp The amplitude of the pitching vibration angle is obtained; f. of 3 Is the pitch vibration frequency; t is time, and the vibration starting time of the model 8 is 0 point;
when the model 8 vibrates compositely, the motion rule of the displacement of the model 8 in the vertical direction is as follows:
where y (t) is the vertical displacement of the model 8 at time t, y amp Is the translational vibration displacement amplitude; f. of 4 Is the translational vibration frequency, f 3 ＝f 4 (ii) a Phi is a phase angle between translational motion and pitching vibration; t is time, and the vibration starting time of the model 8 is 0 point;
in a typical test state, the model 8 performs pitching vibration with an amplitude of 10 degrees at an average attack angle of 5 degrees, the pitching vibration frequency is 5 hertz, the model performs translational vibration with an amplitude of 50 millimeters, the translational vibration frequency is 5 hertz, and a phase angle between the translational vibration and the pitching vibration of the model 8 is 30 degrees, so that a compound vibration equation of the model 8 is as follows:
α(t)＝5°+10°sin(2π×5Hz×t+30°)
y(t)＝50mm×sin(2π×5Hz×t)
where t is time and the time when the model 8 starts to vibrate is 0.
In addition, the pitching vibration has the same frequency as the translational vibration, and the phase angle can be adjusted by the following method:
the method comprises the following steps: the rolling motion between the model supporting shaft 14 and the second sliding block 12 is limited to be released, the gear 7 is meshed with the rack 6, the pitching motor 1 is started, the pitching angle of the model 8 is changed, and the pitching angle of the model 8 is adjusted to a target value, namely equal to the average attack angle;
step two: starting the translation motor 9 to drive the second slide block 12 to move to the middle balance position of the vertical vibration;
step three: when the pitching motor 1 is operated, the pitch angle of the model 8 is changed, and when the pitch angle of the model 8 reaches a preset phase angle, the model stops moving;
step four: this position is recorded, defined as the initial position.
The test is started from the initial position every time when running, the pitching motor 1 and the translation motor 9 run simultaneously, and the phase angle between the translation vibration and the pitching vibration is always fixed in the running process.
The present embodiment is only illustrative of the patent and does not limit the scope of protection thereof, and those skilled in the art can make modifications to the part thereof without departing from the spirit of the patent.
Claims (4)
1. The utility model provides a rotor wing section every single move and translation combined vibration test device which characterized in that: the wind tunnel model comprises a model (8), a model supporting shaft (14), a rotating window (20) and a driving mechanism (21), wherein the model (8) is arranged on the inner side of a wind tunnel side wall (22), the rotating window (20) is installed on the wind tunnel side wall (22), the driving mechanism (21) is arranged on the outer side of the wind tunnel side wall (22), a first sliding groove (15) is processed on the rotating window (20), the first sliding groove (15) is longitudinally arranged on the rotating window (20), the model supporting shaft (14) is connected onto the first sliding groove (15) in a sliding mode, the model supporting shaft (14) penetrates through the first sliding groove (15) to be connected with the model (8), the driving mechanism (21) comprises a pitching driving mechanism and a translation driving mechanism, and the pitching driving mechanism and the translation driving mechanism are respectively connected with the model supporting shaft (14);
the pitching driving mechanism comprises a pitching motor (1), a pitching speed reducer (2), a first eccentric wheel (3), a first sliding block (4), a first sliding rail (5), a rack (6) and a gear (7), wherein the pitching motor (1) is connected with the first eccentric wheel (3) through the pitching speed reducer (2), the first eccentric wheel (3) is connected with the first sliding block (4), the first sliding block (4) is slidably mounted on the first sliding rail (5), the first sliding rail (5) is vertically arranged on a rotating window (20), the first sliding block (4) is provided with the rack (6), the rack (6) and the first sliding rail (5) are arranged in parallel, the rack (6) is meshed with the gear (7), and the gear (7) is sleeved on a model supporting shaft (14);
the translation driving mechanism comprises a translation motor (9), a translation speed reducer (10), a second eccentric wheel (11), a second sliding block (12) and a second sliding rail (13), the translation motor (9) is connected with the second eccentric wheel (11) through the translation speed reducer (10), the second eccentric wheel (11) is connected with the second sliding block (12), the second sliding block (12) is arranged on the second sliding rail (13) in a sliding mode, the second sliding rail (13) is vertically arranged on a rotating window (20), and the second sliding block (12) is detachably connected with a model supporting shaft (14).
2. The rotor wing profile pitch and translation compound vibration test device according to claim 1, wherein: a first fixing rod (16) is arranged on the first eccentric wheel (3), a second sliding groove (17) is transversely processed on the side wall of the first sliding block (4), and the first fixing rod (16) is arranged in the second sliding groove (17) in a sliding mode.
3. The rotor wing profile pitch and translation compound vibration test device according to claim 1, characterized in that: a second fixing rod (18) is arranged on the second eccentric wheel (11), a third sliding groove (19) is transversely processed on the side wall of the second sliding block (12), and the second fixing rod (18) is arranged in the third sliding groove (19) in a sliding manner.
4. The use method of the rotor wing profile pitch and translation compound vibration test device according to claim 3, characterized by comprising the following three vibration states:
individual pitching vibration: the rolling motion between the model supporting shaft (14) and the second sliding block (12) is limited and released, the model supporting shaft (14) freely rotates in the second sliding block (12), the pitching motor (1) drives the first eccentric wheel (3) to continuously rotate through the pitching reducer (2), the first eccentric wheel (3) drives the first sliding block (4) to move up and down on the first sliding rail (5), and the rack (6) on the first sliding block (4) moves up and down to drive the gear (7) to do sinusoidal vibration so as to drive the model (8) to do sinusoidal pitching vibration;
when the model is singly vibrated in a pitching mode, the motion rule of the attack angle of the model is as follows:
α(t)＝α mean +α amp sin(2πf 1 t)
wherein α (t) is the attack angle of the model (8) at time t, t is time, and α is a point 0 at which the model (8) starts to vibrate mean Is the average angle of attack; alpha is alpha amp The amplitude of the pitching vibration angle is obtained; f. of 1 Is the pitch vibration frequency;
single translational vibration: the rolling motion between the model supporting shaft (14) and the second sliding block (12) is limited, the model supporting shaft and the second sliding block are fixedly connected, the gear (7) and the rack (6) are separated, the translation motor (9) drives the second eccentric wheel (11) to continuously rotate through the translation speed reducer (10), the second sliding block (12) is driven to move in the vertical direction, and the model (8) is driven by the second sliding block (12) to vertically translate and vibrate;
when the model is singly translated and vibrated, the motion rule of the displacement of the model (8) in the vertical direction is as follows:
y(t)＝y amp sin(2πf 2 t)
wherein y (t) is the vertical displacement of the model (8) at time t, y amp Is the translational vibration displacement amplitude; f. of 2 Is the translational vibration frequency; t is time, and the vibration starting time of the model (8) is 0 point;
pitching and translation compound vibration:
limiting and releasing the rolling motion between the model supporting shaft (14) and the second sliding block (12), meshing the gear (7) and the rack (6), starting the pitching motor (1) and the translation motor (9) simultaneously, and driving the model (8) to do pitching and translation compound motion under the driving of the first eccentric wheel (3) and the second eccentric wheel (11), wherein the pitching vibration frequency is the same as the translation vibration frequency;
when the model (8) vibrates compositely, the motion rule of the attack angle of the model (8) is as follows:
α(t)＝α mean +α amp sin(2πf 3 t)
wherein α (t) is the attack angle of the model (8) at time t, α mean Is the average angle of attack; alpha is alpha amp The amplitude of the pitching vibration angle is obtained; f. of 3 Is the pitch vibration frequency; t is time, and the vibration starting time of the model (8) is 0 point;
when the model (8) vibrates compositely, the motion rule of the displacement of the model (8) in the vertical direction is as follows:
wherein y (t) is the vertical displacement of the model (8) at time t, and y amp Is the translational vibration displacement amplitude; f. of 4 Is the translational vibration frequency, f 3 ＝f 4 (ii) a Phi is a phase angle between translational motion and pitching vibration; t is time, and the time when the model (8) starts to vibrate is 0.
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