CN220111515U - Displacement output type vibration exciter - Google Patents
Displacement output type vibration exciter Download PDFInfo
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- CN220111515U CN220111515U CN202321652103.7U CN202321652103U CN220111515U CN 220111515 U CN220111515 U CN 220111515U CN 202321652103 U CN202321652103 U CN 202321652103U CN 220111515 U CN220111515 U CN 220111515U
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Abstract
The utility model provides a displacement output type vibration exciter, which comprises a vibration exciting unit, wherein the vibration exciting unit comprises an elastic vibration exciting piece for providing elastic vibration exciting force of a excited structure and a displacement driving assembly for providing stretching acting force of the elastic vibration exciting piece, one end of the elastic vibration exciting piece is connected with one end of the excited structure in the direction to be excited, the other end of the elastic vibration exciting piece is connected with the output end of the displacement driving assembly, and the pre-tensioning length of the elastic vibration exciting piece is larger than the vibration exciting amplitude required to be achieved by the excited structure in an initial state. The utility model has the advantages of ensuring the expected excitation effect of the excited structure, ensuring the safe and reliable excitation process and the like.
Description
Technical Field
The utility model relates to the field of vibration exciters, in particular to a displacement output type vibration exciter.
Background
A vibration exciter (exciter) is a device attached to some machines and equipments to generate exciting force, and is an important part using mechanical vibration. The vibration exciter can enable the excited object to obtain a certain form and size of vibration quantity, so that vibration and strength tests are carried out on the object, or calibration is carried out on a vibration testing instrument and a sensor. The vibration exciter can also be used as an excitation component to form a vibrating machine for realizing the work of conveying materials or objects, screening, compacting, forming, tamping soil sand and stone and the like.
In order to realize simple harmonic excitation, four types of vibration exciter, namely an inertial vibration exciter, a displacement vibration exciter, an electromagnetic vibration exciter and a servo vibration exciter are mainly adopted at present. The inertial vibration exciter generally adopts a reciprocating mass block or a rotary eccentric mass attached to a excited structure, and the inertial force generated when the attached mass block reciprocates is balanced with the counter force of the excited structure on the attached mass, so that the excited structure receives the periodic exciting force applied by the attached mass to the excited structure, and the excited structure is excited; the inertial vibration exciter can provide stable and regular exciting force. The inertial vibration exciter is arranged above the excited structure, and has the advantages of complex structure, large occupied installation space of the excited structure and inconvenient installation; especially when the exciting force needs to be increased, the weight or the size of the exciter needs to be greatly increased, and the exciter occupies larger installation space, so that the problems of inconvenient installation, difficult improvement of the exciting force and the like are caused. Meanwhile, the output force of the inertia vibration exciter is F=Mw 2 The output force of the inertial exciter is related to the exciting frequency Mw, when the exciting frequency Mw is low, the output force is rapidly reduced, the inertial exciter cannot provide enough exciting force in a low-frequency state, and a mass block with large size and weight is required for providing enough exciting force. The excitation principle of the existing displacement exciter is to apply forced displacement to the excited structure, the displacement exciter is rigidly connected with the excited structure, the output force required by the displacement exciter is large when the rigidity of the excited structure is large, and at the moment, the power required by a driving motor of the displacement exciter is large, so that the motor burnout phenomenon is easily caused.
Disclosure of Invention
The utility model aims to solve the technical problem of overcoming the defects of the prior art and providing the displacement output type vibration exciter which ensures the expected excitation effect of the excited structure and ensures the safe and reliable excitation process.
In order to solve the technical problems, the technical scheme provided by the utility model is as follows:
the utility model provides a displacement output type vibration exciter, includes excitation unit, excitation unit is including providing the elastic excitation piece of being excited structure elastic excitation force to and provide the flexible effort's of elastic excitation piece displacement drive assembly, wherein, the one end of elastic excitation piece connect in the one end of being excited the structure wait to excite the direction, the other end of elastic excitation piece connect displacement drive assembly's output, the pretension length of elastic excitation piece is greater than the excitation amplitude that is required to reach by the structure when initial state.
As a further improvement of the above technical scheme:
the excited structure is an excited structure with horizontal and vertical bidirectional vibration; the vibration excitation units are arranged in two groups, the two groups of vibration excitation units are respectively arranged in the horizontal vibration direction and the vertical vibration direction of the excited structure, and the arrangement direction of the elastic vibration excitation piece is the same as the to-be-excited vibration direction of the excited structure or is arranged at an included angle.
The excited structure is a wind power generation blade; the excitation units are connected to one end, far away from the fixed end, of the wind power generation blade and are located on one side of the swing direction of the wind power generation blade.
The displacement driving assembly comprises a rotation driving part, the rotation driving part comprises a rotation driving part and a swinging rod, the driving end of the rotation driving part is connected with the swinging rod, and the swinging end of the swinging rod is connected with the elastic excitation part.
The displacement driving assembly further comprises a guide component for ensuring that the elastic excitation piece provides excitation force along the excitation direction to be excited by the excited structure, and the guide component is arranged at the end part of the elastic excitation piece, which is close to the excited structure.
The guide part comprises two guide wheels which are symmetrically arranged in the length direction perpendicular to the elastic excitation piece, and a guide channel for the elastic excitation piece to pass through is reserved between the two guide wheels.
The displacement driving assembly further comprises a tensioning wheel used for guaranteeing that the elastic exciting piece is in a tensioning state, and the tensioning wheel is arranged between the elastic exciting piece and the guide part.
The swinging rod is perpendicular to or parallel to the expansion and contraction direction of the elastic excitation piece.
The rotary driving piece is a rotary motor, and the driving end of the rotary motor is connected with the swinging rod.
The displacement driving assembly comprises a linear driving part and an elastic balancing piece, wherein the driving end of the linear driving part is connected with the elastic excitation piece, and the moving direction of the linear driving part is the same as the extending and contracting direction of the elastic excitation piece; the elastic balancing piece and the elastic exciting piece are symmetrically arranged along the moving direction of the linear driving part, the pretension length of the elastic balancing piece is larger than the excitation amplitude required to be achieved by the excited structure in an initial state, and the elastic balancing piece and the elastic exciting piece are two identical elastic pieces.
Compared with the prior art, the utility model has the advantages that:
(1) The device is provided with the elastic excitation piece and the displacement driving assembly, one end of the elastic excitation piece is connected with one end of the excited structure in the excitation direction, the other end of the elastic excitation piece is connected with the output end of the displacement driving assembly, acting force of the displacement driving assembly is transmitted to the excited structure through the elastic excitation piece, and at the moment, periodic expansion and contraction of the elastic excitation piece provides exciting force of reciprocating motion of the excited structure, so that the excited structure effectively vibrates in the excitation direction.
(2) Compared with the traditional displacement type vibration exciter, the elastic vibration exciter is arranged to enable the displacement vibration exciter to be in elastic connection with the excited structure, due to the transitional effect of the elastic vibration exciter, the vibration exciter can provide enough exciting force without too high power, namely the output force required by the vibration exciter when the rigidity of the excited structure is high is small, at the moment, the power required by a driving motor of the displacement vibration exciter is small, the occurrence of the motor burning phenomenon is effectively avoided, and the reliable and safe operation of the vibration exciting process is ensured.
(3) Compared with an inertial vibration exciter, the utility model has the advantages that the output force of the elastic vibration exciter and the output position of the displacement driving assemblyShift value u d And equivalent stiffness k of the elastic excitation member 2 The vibration exciter has the advantages that the vibration exciter is low in output force, and the elastic vibration exciting piece can provide enough vibration exciting force for a excited structure in a low-frequency state; meanwhile, the vibration exciter is arranged on the outer side of the excited structure, and does not occupy the inner space of the excited structure, so that the vibration exciter does not need to increase weight and size when exciting force, and has a simple structure and is convenient to install.
(4) The pretension length of the elastic excitation piece is larger than the excitation amplitude required to be achieved by the excited structure in the initial state, so that the excited structure has enough excitation space in excitation, and the excitation effect of the excited structure is better ensured.
Therefore, the vibration excitation mode of the traditional vibration exciter is completely changed by adopting the mode that the elastic vibration excitation piece provides elastic vibration excitation force, and the vibration excitation force can be effectively adjusted by changing parameters such as the expansion and contraction amount, the rigidity, the vibration excitation frequency and the like of the elastic vibration excitation piece, so that the excited structure achieves expected vibration excitation displacement; meanwhile, the utility model effectively avoids the phenomena that the traditional inertial vibration exciter needs to increase exciting force by increasing weight or size and the traditional displacement vibration exciter is easy to damage a motor.
Drawings
The utility model will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings. Wherein:
fig. 1 is a schematic structural diagram of embodiment 1 of the present utility model in a specific application.
Fig. 2 is an enlarged schematic view of a portion a of fig. 1.
Fig. 3 is a schematic structural view of embodiment 2 of the present utility model.
Fig. 4 is another structural schematic diagram of embodiment 2 of the present utility model.
Fig. 5 is a schematic structural view of embodiment 3 of the present utility model.
Fig. 6 is a schematic diagram of a displacement output type vibration exciter according to the present utility model.
The reference numerals in the drawings denote:
1. an elastic excitation member; 2. a displacement drive assembly; 21. a swing driving part; 211. a rotary driving member; 212. a swinging rod; 213. a guide member; 214. a tensioning wheel; 22. a linear driving part; 221. an elastic balancing piece; 3. a excited structure; 31. wind power generation blades.
Detailed Description
The utility model will now be described in further detail with reference to the drawings and the specific examples, which are not intended to limit the scope of the utility model.
Example 1
Fig. 1 and 2 show an embodiment of the displacement output type vibration exciter of the present utility model, which can be used for fatigue test and other occasions requiring exciting force, such as sand screening, etc. In this embodiment, the displacement output type vibration exciter includes a vibration exciting unit, and the vibration exciting unit includes an elastic vibration exciting member 1 and a displacement driving assembly 2. One end of the elastic excitation piece 1 is connected to one end of the excited structure 3 in the excitation direction, the other end of the elastic excitation piece 1 is connected to the output end of the displacement driving assembly 2, and the elastic excitation piece 1 is used for providing elastic excitation force of the excited structure 3; the displacement driving component 2 is arranged on one side of the excited structure 3 in the direction to be excited, acting force of the displacement driving component 2 is transmitted to the excited structure 3 through the elastic excitation piece 1, and at the moment, periodic expansion and contraction of the elastic excitation piece 1 provides exciting force for the excited structure 3 to reciprocate, so that the excited structure 3 effectively vibrates in the direction to be excited. Meanwhile, the pretension length of the elastic vibration excitation piece 1 is larger than the vibration excitation amplitude required to be achieved by the excited structure 3 in the initial state, so that the excited structure 3 has enough vibration excitation space in vibration excitation, and the vibration excitation effect of the excited structure 3 is better ensured.
Compared with the traditional displacement type vibration exciter, the elastic vibration exciter 1 is arranged to enable the vibration exciter to be in elastic connection with the excited structure 3, due to the transitional effect of the elastic vibration exciter 1, the vibration exciter can provide enough exciting force without too much power, namely, the output force required by the vibration exciter when the rigidity of the excited structure 3 is high is small, at the moment, the power required by a driving motor of the vibration exciter is small, the occurrence of the motor burning phenomenon is effectively avoided, and the reliable and safe operation of the vibration exciting process is ensured.
Compared with an inertial vibration exciter, the utility model has the advantages that the output force of the elastic vibration exciter 1 and the output displacement amplitude u of the displacement driving component 2 d And the equivalent stiffness k of the elastic excitation member 1 2 The vibration exciter is related to the vibration exciting frequency of the vibration exciter, so that when the structural vibration exciting frequency is low, the output force of the vibration exciter is not affected, and the elastic vibration exciter 1 can provide enough vibration exciting force for the excited structure 3 in a low-frequency state; meanwhile, the vibration exciter is arranged on the outer side of the excited structure 3, and does not occupy the inner space of the excited structure 3, so that the vibration exciter does not need to increase weight and size when exciting force, and has simple structure and convenient installation.
Therefore, the utility model adopts the elastic exciting piece 1 to provide the elastic exciting force, completely changes the exciting mode of the traditional exciter, and can effectively adjust the exciting force by changing the parameters of the elastic exciting piece 1 such as the expansion and contraction amount, the rigidity, the exciting frequency and the like, so that the excited structure 3 achieves the expected exciting displacement; meanwhile, the utility model effectively avoids the phenomena that the traditional inertial vibration exciter needs to increase exciting force by increasing weight or size and the traditional displacement vibration exciter is easy to damage a motor. Specifically, the method comprises the following steps:
as shown in fig. 6, the excited structure 3 is simplified to a single degree of freedom system. The excited structure 3 comprises a modal mass m and an equivalent stiffness k 1 And an equivalent damping coefficient c, it is noted that k 1 And c is the equivalent stiffness and equivalent damping coefficient representing the structure, which is used to build a mathematical model to analyze the excitation effect, the structure itself is not necessarily provided with springs and damping elements. When the modal mass m of the excited structure 3 is connected with the output end of the excitation source (displacement driving component 2) through the elastic excitation piece 1, an elastic excitation force output system is formed. Positioning the equivalent stiffness of the elastic excitation member 1 to be k 2 Displacement of the output end of the excitation source relative to the groundDefined as x 2 The displacement of the excited structure 3 relative to the base is defined as x 1 . The control equation of the elastic exciting force output system can be established according to Hooke's law as follows: mx 1 +cx 1 +(k 1 +k 2 )x 1 ＝k 2 x 2
Wherein x is 1 Is the displacement of the excited structure 3; x is x 2 Is the displacement of the output end of the vibration exciter; k (k) 1 Is the modal stiffness of the excited structure 3; m is the modal mass of the excited structure 3; c is the modal damping of the excited structure 3; k (k) 2 Is the rigidity of the exciting spring.
At the same time, when the output end of the excitation source (displacement driving component 2) is displaced by x 2 By displacement x of the elastic excitation member 1 when time-varying 2 X with excited structure 3 1 The excitation source will interact with the excited structure 3. If the motion of the output end of the excitation source is regular reciprocating motion, the excited structure 3 will be acted by periodic force, the excitation source can reach the set action of the exciter, in particular, when the output end of the excitation source is in simple harmonic motion, x 2 Satisfy x 2 (t)＝u d sin Ω t, where u d To output displacement amplitude of the excitation source Ω is excited by the steady state response frequency of the structure 3.
According to the control equation of the elastic exciting force output system and the displacement x of the exciting source output end 2 The satisfied formula can be given as the steady state response displacement expression of the excited structure 3:
wherein:
wherein x is 1p (t) is the steady state response displacement, k, of the excited structure 3 2 U is the equivalent rigidity of the elastic excitation member 1 d For the output displacement amplitude, k of the excitation source 1 For the equivalent stiffness of the excited structure 3, beta is the tuning frequency ratio of the excited structure 3, Ω is the steady state response frequency of the excited structure 3, ω is the natural frequency of the excited structure 3,for the equivalent damping ratio of the excited structure 3, m is the modal mass of the excited structure 3, c is the equivalent damping coefficient of the excited structure 3, and θ is the initial phase of the excited structure 3.
Wherein sin (Ω - θ) characterizes the steady state response frequency of the excited structure 3 and the initial phase of the excited structure 3, and varies between ±1.The steady state response displacement amplitude of the excited structure 3, which contains u d 、k 2 、k 1 Beta and->Wherein k is 1 And->The equivalent stiffness and equivalent damping ratio of the excited structure 3, respectively, are known inherent characteristics of the excited structure 3. And u is d 、k 2 And beta is the output displacement amplitude of the excitation source (displacement driving component 2), the equivalent stiffness of the elastic excitation member 1 and the excitation frequency of the steady-state response of the excited structure 3 (equal to the excitation frequency of the excitation source), respectively, it can be seen that u d 、k 2 And beta is related parameters of the excitation source (displacement driving assembly 2) and the elastic excitation piece 1, and the parameters are adjustable.
Thus, the present utility model is realized by adjusting the output of the excitation source (displacement driving assembly 2)Output displacement amplitude u d Equivalent stiffness k of the elastic excitation member 1 2 And the excitation frequency omega (beta=omega/omega) of the steady state response of the excited structure 3, so that the amplitude of the steady state response displacement of the excited structure 3 can reach a required value.
At the same time, steady state response displacement of the excited structure 3 and output displacement amplitude u of the excitation source (displacement driving assembly 2) d Equivalent stiffness k of elastic excitation member 1 2 Positive correlation. When specifically set up, u d The larger and better the condition of the site condition is satisfied, the larger the amplitude of the steady-state response displacement of the excited structure 3 is at the moment; at the same time, Ω selects an optimum value (the closer ω is to the response, the greater the amplification speed), k, according to the natural frequency ω of the excited structure 3 2 Then at determination u d And Ω, according to the desired amplitude of the excited structure 3. The utility model combines the actual situation of the site by reasonably selecting a group of k 2 、u d The utility model proves that the excitation principle and structure provided by the utility model can reach the expected excitation effect of the excited structure 3 from the mechanical analysis.
Because of the output force of the elastic vibration excitation piece 1 and the output displacement amplitude u of the vibration source d And the equivalent stiffness k of the elastic excitation member 1 2 The excitation frequency of the excitation source is irrelevant. Therefore, when the excitation frequency of the excitation source is low, the output force of the excitation source is not affected, and the elastic excitation member 1 can provide enough excitation force for the excited structure 3 in a low-frequency state. Therefore, the utility model has simple structure but is superior to the traditional inertial vibration exciter and displacement vibration exciter.
As shown in fig. 1 and 2, the displacement output type vibration exciter of the present embodiment is used in the wind power generation field, and the excited structure 3 is a wind power generation blade 31. In order to study the vibration condition of the wind power generation blade 31 under the excitation of external force and perform the excitation test, one end of the wind power generation blade 31 is fixedly arranged, the displacement output type vibration exciter is arranged at one end of the wind power generation blade 31 far away from the fixed end in order to enable the wind power generation blade 31 to generate first-order transverse vibration (up-down vibration as shown in fig. 1), namely, the elastic excitation member 1 is connected below one end of the wind power generation blade 31 far away from the fixed end, and the rotation driving member 21 is in driving connection with the elastic excitation member 1. The utility model applies downward alternating tension to the wind power generation blade 31 to enable the wind power generation blade 31 to vibrate, thereby realizing reliable and effective vibration excitation of the wind power generation blade 31.
In other embodiments, the elastic excitation member 1 may be disposed in the direction to be excited of the wind turbine blade 31, for example, the elastic excitation member 1 may be connected above one end of the wind turbine blade 31 away from the fixed end; meanwhile, other driving components for periodically and reciprocally moving the wind power generation blades 31 may be used as the displacement driving component 2, for example, a linear driving component 22 for linearly and reciprocally moving the wind power generation blades 31 may be used.
As shown in fig. 2, the displacement drive assembly 2 of the present embodiment includes a swing drive member 21, and the swing drive member 21 includes a swing drive 211 and a swing lever 212. The driving end of the rotary driving member 211 is connected to the swinging rod 212, the swinging end of the swinging rod 212 is connected to the elastic exciting member 1, and the swinging rod 212 is perpendicular to the stretching direction of the elastic exciting member 1, at this time, the swinging rod 212 swings along the stretching direction of the elastic exciting member 1, and when driving the excited structure 3 to generate rotary motion along the direction to be excited, the frequency, the stroke and the rotation speed of the rotary motion can be changed, so that the excited structure 3 can effectively vibrate along the direction to be excited. In the present embodiment, by changing the length of the swing lever 212 (i.e., the output displacement amplitude u of the excitation source d ) The adjustment of the exciting force of the elastic exciting piece 1 can be realized.
In other embodiments, it is only necessary to ensure that the swing rod 212 provides a sufficient exciting force to the elastic exciting member 1, as shown in fig. 3 and 4, and as shown in fig. 3 and 4, the swing rod 212 may be disposed parallel to or at an angle to the extending and contracting direction of the elastic exciting member 1.
Further, the rotary driving member 211 is a rotary motor, and a driving end of the rotary motor is connected to the swing lever 212. The driving reliability is high, the structure is simple, the occupied space is small, and the cost is low.
In this embodiment, the specific operation process of the displacement output type vibration exciter is as follows: the swing motor is connected to the wind power generation blade 31 through the swing rod 212 and the elastic excitation member 1, the swing rod 212 generates displacement with the wind power generation blade 31 in the process of performing the swing motion, and the swing rod 212 is connected with the wind power generation blade 31 through the elastic excitation member 1, so that the elastic excitation member 1 is deformed due to the relative displacement between the swing rod 212 and the wind power generation blade 31, and the swing motion of the swing rod 212 generates periodic elastic excitation force to the wind power generation blade 31 through the elastic excitation member 1 under the driving of the swing motor, so that the wind power generation blade 31 generates reciprocating vibration. The mechanical analysis proves that the elastic exciting force applied to the wind power generation blade 31 by the utility model is a stable simple harmonic exciting force when the motion is stable.
Example 2
Fig. 3 shows another embodiment of the displacement output type vibration exciter of the present utility model, which is basically the same as embodiment 1, except that the excited structure 3 of the present embodiment has excitation requirements in both horizontal and vertical directions. The two groups of excitation units are respectively arranged in the horizontal vibration direction and the vertical vibration direction of the excited structure 3, and the arrangement direction of the elastic excitation piece 1 is the same as the to-be-excited vibration direction of the excited structure 3, namely the expansion and contraction direction of the elastic excitation piece 1 is the vibration direction of the excited structure 3. So as to ensure that the excited structure 3 simultaneously vibrates in two directions and realize the effective excitation of the excited structure 3 in the horizontal and vertical directions.
In other embodiments, the number and positions of the displacement output type exciters may be set according to the direction and number of the excitation required by the excited structure 3, for example, three groups, four groups, or the like may also be set, where each group of displacement output type exciters is set along the direction to be excited by the corresponding excited structure 3.
Further, the displacement driving assembly 2 further includes a guiding component 213, where the guiding component 213 is disposed at an end of the elastic exciting member 1 near the excited structure 3, so as to ensure that the elastic exciting member 1 provides an exciting force along the direction to be excited by the excited structure 3.
Furthermore, the guiding member 213 comprises two guiding wheels, which are symmetrically arranged perpendicular to the length direction of the elastic exciting member 1, and a guiding channel is reserved between the two guiding wheels for the elastic exciting member 1 to pass through, so as to ensure that the elastic exciting member 1 provides stable and reliable exciting force along the exciting direction of the excited structure 3. In other embodiments, the guiding member 213 may be configured as a guiding wheel, as long as the elastic excitation member 1 is guaranteed to provide the excitation force in the direction to be excited to the excited structure 3.
In other embodiments, as shown in fig. 4, the arrangement direction of the elastic excitation member 1 is not necessarily arranged in the vibration direction of the excited structure 3, and the arrangement direction of the elastic excitation member 1 may be arranged at an angle to the vibration direction of the excited structure 3, as is subject to the on-site situation. At this time, a tensioning wheel 214 is provided between the elastic excitation member 1 and the guide member 213, the tension of the elastic excitation member 1 is ensured by the tensioning wheel 214, and the acting force of the elastic excitation member 1 on the excited structure 3 is adjusted.
Example 3
Fig. 5 shows another embodiment of a displacement output type vibration exciter of the present utility model, which is basically the same as embodiment 2, except that the displacement driving assembly 2 of the present embodiment includes a linear driving member 22, the driving end of the linear driving member 22 is connected with the elastic vibration exciter 1, and the moving direction of the linear driving member 22 is the same as the extending direction of the elastic vibration exciter 1, which can change the frequency and the stroke of the reciprocating motion of the output end of the displacement driving assembly 2 while providing the linear reciprocating motion power of the excited structure 3, so as to realize the reliable and effective vibration excitation of the excited structure 3.
In this embodiment, the extension and contraction direction of the elastic excitation member 1 is the vibration direction of the excited structure 3, that is, the arrangement direction of the elastic excitation member 1 is the same as the vibration direction of the excited structure 3. In other embodiments, the elastic excitation member 1 may be provided only by providing a force of the excited structure 3 in the direction of vibration to be excited, and the arrangement direction of the elastic excitation member 1 may be arranged at an angle to the vibration direction of the excited structure 3.
Further, the displacement output type vibration exciter further comprises an elastic balancing piece 221, wherein the elastic balancing piece 221 and the elastic vibration exciting piece 1 are two identical elastic pieces; the elastic balancing piece 221 and the elastic exciting piece 1 are symmetrically arranged along the moving direction of the linear driving part 22, one end of the elastic balancing piece 221 is connected with the driving end of the linear driving part 22, and the other end of the elastic balancing piece 221 is fixedly arranged. The arrangement of the elastic balancing piece 221 determines the balance position of the driving end of the linear driving part 22 during static and working so as to balance the elastic force of the elastic excitation piece 1 and ensure that the excitation is reliably and safely carried out.
In this embodiment, the exciting spring and the balance spring are both in a stretched state in the initial state, and the pretension length of the elastic balance member 221 is greater than the exciting amplitude required to be achieved by the excited structure 3 in the initial state, so that the excited structure 3 has enough exciting space in exciting. In this embodiment, the elastic vibration element 1 and the elastic balancing element 221 are two identical extension springs.
In this embodiment, the specific operation process of the displacement output type vibration exciter is as follows: the linear driving part 22 is connected to the excited structure 3 through the elastic excitation member 1, displacement is generated between the linear driving part 22 and the excited structure 3 in the process of driving the elastic excitation member 1 to reciprocate, and accordingly, the linear driving part 22 is driven by the linear driving part 22 to reciprocate, periodic elastic excitation force is generated on the excited structure 3 through the elastic excitation member 1, and the excited structure 3 is vibrated in a reciprocating mode. The mechanical analysis proves that the elastic exciting force applied to the excited structure 3 by the utility model is a stable simple harmonic exciting force when the motion is stable.
While the utility model has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the utility model. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present utility model is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Claims (10)
1. The utility model provides a displacement output type vibration exciter which is characterized in that, includes the excitation unit, the excitation unit is including providing the elastic excitation piece of the elastic excitation force of structure that is excited to and provide the displacement drive assembly of the flexible effort of elastic excitation piece, wherein, one end of elastic excitation piece connect in the one end of the structure that is excited to wait for the excitation direction of structure that is excited to, the other end of elastic excitation piece connect the output of displacement drive assembly, the pretension length of elastic excitation piece is greater than the vibration amplitude that is excited the structure that is excited needs to reach when initial state.
2. The displacement output type vibration exciter according to claim 1, wherein the excited structure is an excited structure having horizontal and vertical bidirectional vibrations; the vibration excitation units are arranged in two groups, the two groups of vibration excitation units are respectively arranged in the horizontal vibration direction and the vertical vibration direction of the excited structure, and the arrangement direction of the elastic vibration excitation piece is the same as the to-be-excited vibration direction of the excited structure or is arranged at an included angle.
3. The displacement output type vibration exciter according to claim 1, wherein the excited structure is a wind power generation blade; the excitation units are connected to one end, far away from the fixed end, of the wind power generation blade and are located on one side of the swing direction of the wind power generation blade.
4. A displacement output vibration exciter according to any one of claims 1 to 3, characterised in that the displacement drive assembly comprises a rotary drive member comprising a rotary drive member and a swinging rod, the drive end of the rotary drive member being connected to the swinging rod, the swinging end of the swinging rod being connected to the resilient excitation member.
5. The displacement output type vibration exciter according to claim 4, wherein the displacement driving assembly further comprises a guide member for ensuring that the elastic vibration excitation member provides an excitation force in a direction in which the excited structure is to be excited, and the guide member is provided at an end portion of the elastic vibration excitation member close to the excited structure.
6. The displacement output type vibration exciter according to claim 5, wherein the guide member comprises two guide wheels symmetrically arranged in a direction perpendicular to the length direction of the elastic vibration excitation member, and a guide channel for the elastic vibration excitation member to pass through is reserved between the two guide wheels.
7. The displacement-output vibration exciter according to claim 5, characterized in that the displacement-driving assembly further comprises a tension wheel for securing the elastic excitation member in a tensioned state, the tension wheel being provided between the elastic excitation member and the guide member.
8. The displacement output type vibration exciter according to claim 4, wherein the swinging rod is arranged perpendicular to or parallel to the expansion and contraction direction of the elastic excitation member.
9. The displacement output type vibration exciter according to claim 4, wherein the rotary driving member is a rotary motor, and the driving end of the rotary motor is connected to the swing rod.
10. A displacement output type vibration exciter according to any one of claims 1 to 3, wherein the displacement driving assembly comprises a linear driving member and an elastic balancing member, the driving end of the linear driving member is connected with the elastic vibration member, and the moving direction of the linear driving member is the same as the extending and contracting direction of the elastic vibration member; the elastic balancing piece and the elastic exciting piece are symmetrically arranged along the moving direction of the linear driving part, the pretension length of the elastic balancing piece is larger than the excitation amplitude required to be achieved by the excited structure in an initial state, and the elastic balancing piece and the elastic exciting piece are two identical elastic pieces.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321652103.7U CN220111515U (en) | 2023-06-27 | 2023-06-27 | Displacement output type vibration exciter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321652103.7U CN220111515U (en) | 2023-06-27 | 2023-06-27 | Displacement output type vibration exciter |
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