CN210859654U - Dynamic vibration absorber of urban rail vehicle body based on quasi-zero stiffness principle - Google Patents
Dynamic vibration absorber of urban rail vehicle body based on quasi-zero stiffness principle Download PDFInfo
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- CN210859654U CN210859654U CN201921735180.2U CN201921735180U CN210859654U CN 210859654 U CN210859654 U CN 210859654U CN 201921735180 U CN201921735180 U CN 201921735180U CN 210859654 U CN210859654 U CN 210859654U
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- regular hexagon
- spring mechanism
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Abstract
The utility model discloses a dynamic vibration absorber of an urban rail vehicle body based on a quasi-zero stiffness principle, which comprises an underframe base, a regular hexagon box body, a screw mechanism, a regular hexagon stopper mechanism, a transverse hydraulic spring mechanism, a circular vibrator mechanism and a vertical hydraulic spring mechanism; chassis base fixed mounting has regular hexagon stopper mechanism at city rail vehicle automobile body bottom middle part, and regular hexagon box passes through bolt group to be installed on the chassis base, and screw rod mechanism fixed mounting has regular hexagon stopper mechanism at the upper and lower both ends of circular oscillator mechanism, and regular hexagon stopper mechanism is fixed inside the regular hexagon box through horizontal hydraulic spring mechanism and vertical hydraulic spring mechanism, and vertical hydraulic spring mechanism is the same with horizontal hydraulic spring mechanism structure, including pneumatic cylinder, spring and hinge means, and the spring housing is outside the pneumatic cylinder. The utility model can adjust the rigidity of the dynamic vibration absorber within a certain range so as to realize wide frequency vibration reduction on the urban rail vehicle body in the vertical direction; simple structure, convenient installation and high safety.
Description
Technical Field
The utility model relates to a city rail vehicle damping technical field specifically is a city rail vehicle automobile body dynamic vibration absorber based on quasi-zero rigidity principle.
Background
When the urban rail vehicle runs, because the wheel rail vibration that the track irregularity produced is transmitted to the automobile body through primary suspension and secondary suspension, the vertical vibration displacement of automobile body has been produced, has reduced the operation quality of vehicle, still can cause certain influence to passenger's the comfort level of taking simultaneously. The dynamic vibration absorber has the advantages of simple structure and good vibration reduction effect, and becomes one of effective means for reducing the vibration of the urban rail vehicle body and improving the riding comfort of passengers.
The conventional dynamic vibration absorbers are generally classified into an active type and a passive type: the active dynamic vibration absorber changes related parameters through active control to achieve vibration reduction in a wider frequency band, and the working principle of the active dynamic vibration absorber is that external energy is utilized to enable the dynamic vibration absorber to apply active control force to a vibration reduction target at the moment when the vibration reduction target generates vibration so as to achieve the purpose of rapid vibration reduction, but the active dynamic vibration absorber has the defects of complex structure, large energy consumption, high control precision requirement, poor stability, high maintenance cost and the like; the general passive vibration absorber mostly adopts a mass block as a vibrator for vibration reduction, has simple structure and convenient installation, can play a good vibration reduction role aiming at single fixed vibration excitation frequency, but has difficult parameter adjustment, thus being not suitable for occasions with larger vibration frequency change and wider frequency band.
The quasi-zero stiffness is characterized in that positive stiffness mechanisms and negative stiffness mechanisms are connected in parallel, the stiffness and structural parameters of a system are changed, the overall stiffness of the system is approximate to zero at a static balance position, the required positive stiffness and negative stiffness are generally generated by linear or nonlinear springs, and after the two springs are connected in parallel, stress and displacement curves of the two springs present highly nonlinear characteristics. Because the rigidity has the nonlinear characteristic, the system can bear large load and is not easy to deform; the natural frequency of the system is low, and the vibration damping frequency band is widened; the rigidity is convenient to adjust, and the device can adapt to different actual needs.
The quasi-zero stiffness dynamic vibration absorber belongs to a passive dynamic vibration absorber, but compared with a common passive dynamic vibration absorber, the quasi-zero stiffness dynamic vibration absorber has the advantages of adjustable stiffness, wide vibration attenuation frequency band and the like; meanwhile, compared with an active dynamic vibration absorber, the quasi-zero stiffness dynamic vibration absorber has the advantages of simple structure, convenience in installation, no need of active control, no need of external energy and the like. Therefore, the quasi-zero stiffness dynamic vibration absorber can be greatly applied as a novel dynamic vibration absorber integrating the advantages of a passive type vibration absorber and an active type vibration absorber.
The invention patent with the patent application number of 201710366150.8 discloses a dynamic vibration absorber, wherein a mass block is used as a vibrator, and the mass block is arranged on two limit walls by a silica gel column, the vibration absorber is simple in structure and high in reliability, but the frequency adjusting method is not suitable for vibration reduction of an urban rail vehicle body, because the urban rail vehicle is wide in vibration exciting frequency range when in operation, and the passenger capacity and the speed of the urban rail vehicle are frequently changed, the vibration frequency range of the vehicle body is widened. The invention patent with the patent application number of 201610398297.0 discloses a dynamic vibration absorber, which adopts inertia force to drive, combines the momentum conservation theorem to realize the movement of a moving mechanism of the dynamic vibration absorber on a plate, realizes the adjustment of the natural frequency of the vibration absorber by the variable rigidity through the change of the relative position of the moving mechanism of the dynamic vibration absorber on the plate, but is only suitable for the vibration reduction in a smaller frequency range because the vibrator mass is smaller, and is not suitable for the larger vibration frequency band of a city rail vehicle.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a city rail vehicle automobile body dynamic vibration absorber based on quasi-zero rigidity principle is applicable to and solves the vertical vibration problem of city rail vehicle automobile body.
In order to achieve the above object, the utility model provides a following technical scheme: the dynamic vibration absorber is installed at the bottom middle part of an urban rail vehicle body and comprises an underframe base fixed at the bottom of the vehicle body, a regular hexagon box body, a screw mechanism, a regular hexagon limiting block mechanism, a transverse hydraulic spring mechanism, a circular vibrator and a vertical hydraulic spring mechanism, wherein the regular hexagon box body is fixedly connected onto the underframe base through a bolt group, the regular hexagon limiting block mechanism limits the position of the circular vibrator through the screw mechanism, the transverse hydraulic spring mechanism and the vertical hydraulic spring mechanism fix the regular hexagon limiting block mechanism and the circular vibrator mechanism inside the regular hexagon box body, the transverse hydraulic spring mechanism and the vertical hydraulic spring mechanism comprise a hydraulic cylinder, a spring and a hinge device, and the spring is sleeved outside the hydraulic cylinder.
Preferably, the chassis base adopts the fluting design, and six through-holes that the inslot was opened has the installation of cooperation regular hexagon box, the combination bolt passes the through-hole and is connected with the regular hexagon box, and six sides respectively open there are two through-holes for fixed mounting is in city rail vehicle automobile body bottom.
Preferably, threaded holes are formed in six corners of the top of the regular hexagon box body and are connected with the base frame base through combination bolts, each surface of the regular hexagon box body is also provided with a threaded hole and is used for fixing the transverse hydraulic spring mechanism and the vertical hydraulic spring mechanism respectively, and the horizontal height of the box wall threaded hole for fixing the transverse hydraulic spring mechanism is higher than that of the box wall threaded hole for fixing the vertical hydraulic spring mechanism.
Preferably, the transverse hydraulic spring mechanism and the vertical hydraulic spring mechanism are fixedly connected between the regular hexagon box body and the regular hexagon limiting block mechanism through bolts.
Preferably, the horizontal hydraulic spring mechanism is in a horizontal position after being installed to serve as a negative stiffness element and is connected in parallel with the vertical hydraulic spring mechanism serving as a positive stiffness element, and therefore nonlinear stiffness of the system near the balance position of the system can be achieved.
Preferably, the regular hexagon limiting block mechanism fixes the position of the circular vibrator through the screw mechanism, and is fixedly installed inside the regular hexagon box body through the transverse hydraulic spring mechanism and the vertical hydraulic spring mechanism by utilizing the bolt group and the hinge device.
Preferably, the circular vibrator mechanism is fixedly installed between the regular hexagon limiting block mechanisms through a screw rod mechanism.
Preferably, the screw rod mechanism is composed of a threaded rod and a hexagon nut, threads are arranged at two ends of the threaded rod, and the threaded rod with the corresponding length can be selected according to the total height of the circular vibrator mechanism and the regular hexagon limiting block mechanism.
The utility model discloses possess following beneficial effect:
(1) the utility model discloses utilize the rigidity and the structural parameter of accurate zero rigidity principle change system, widened the damping frequency channel of dynamic vibration absorber, be favorable to realizing the wide band damping of urban rail vehicle automobile body.
(2) The utility model discloses a reasonable mechanical structure design has the vacant space of utilizing urban rail vehicle bottom of the automobile body rationally simultaneously, and is rationally distributed, can not cause the interference with other vehicle parts, is applicable to urban rail vehicle automobile body damping.
Drawings
FIG. 1 is a sectional view of the overall structure of the present invention;
fig. 2 is an external view of the present invention;
FIG. 3 is a schematic view of the internal structure of the present invention;
FIG. 4 is a schematic view of the base structure of the bottom frame of the present invention;
FIG. 5 is a schematic structural view of the regular hexagon box of the present invention;
FIG. 6 is a schematic structural view of the screw mechanism of the present invention;
FIG. 7 is a schematic structural view of a regular hexagonal stopper mechanism of the present invention;
fig. 8 is a schematic structural view of the transverse hydraulic spring mechanism of the present invention;
fig. 9 is a schematic structural view of the circular vibrator of the present invention;
in the figure: 1: a chassis base; 11: a sidewall via; 12: a top via; 2: a regular hexagonal box body; 21: a top threaded hole; 22: box wall threaded holes; 3: a screw mechanism; 31: a threaded rod; 32: a hexagonal nut; 4: a regular hexagonal stopper mechanism; 41: a through hole of the limiting block; 42: a threaded hole of the limiting block; 5: a transverse hydraulic spring mechanism; 51: a hydraulic cylinder; 52: a spring; 53: hinge mechanism: 6: a circular vibrator mechanism; 61: a vibrator through hole; 7: a vertical hydraulic spring mechanism.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
As shown in fig. 1-9, the utility model provides a city rail vehicle automobile body dynamic vibration absorber based on quasi-zero rigidity principle, the bump leveller includes chassis base 1, regular hexagon box 2, screw mechanism 3, regular hexagon stopper mechanism 4, horizontal hydraulic spring mechanism 5, circular oscillator mechanism 6 and vertical hydraulic spring mechanism 7.
The base frame base 1 is fixedly installed in the middle of the bottom end of an urban rail vehicle body through a side wall through hole 11, and the regular hexagon box body 2 is fixedly installed on the base frame base 1 through a top bolt hole 21 connected through a bolt group top through hole 12.
The threaded rod 31 in the screw mechanism 3 sequentially penetrates through the limit block through hole 41 in the regular hexagon limit block mechanism 4 and the vibrator through hole 61 in the circular vibrator 6, and the hexagonal nut 32 is used for fixing the position, so that the regular hexagon limit block mechanism 4 is tightly connected with the circular vibrator 6.
After the regular hexagon limiting block mechanism 4 and the circular vibrator 6 are tightly connected through the screw rod mechanism 3, the bolt group is used for penetrating the hinge device 53 to fixedly connect the transverse hydraulic spring mechanism 5 and the vertical hydraulic spring mechanism 7 on the limiting block threaded hole 42 in the regular hexagon limiting block mechanism 4, the bolt group is used for penetrating the hinge device 54 to fixedly connect the transverse hydraulic spring mechanism 5 and the vertical hydraulic spring mechanism 7 on the box wall threaded hole 22 of the regular hexagon box body 2, and the horizontal height of the box wall threaded hole 22 for fixing the transverse hydraulic spring mechanism 5 is higher than that of the box wall threaded hole 22 for fixing the vertical hydraulic spring mechanism 7.
When an urban rail vehicle is excited by rail irregularity inside the regular hexagonal box body 2 by the transverse hydraulic spring mechanism 5 and the vertical hydraulic spring mechanism 7, the vehicle body generates vertical vibration displacement, and meanwhile, the vibration absorber system also generates vibration displacement correspondingly, at the moment, the transverse hydraulic spring mechanism 5 is used as a negative stiffness element, the vertical hydraulic spring mechanism 7 is used as a positive stiffness element, the whole spring system can form a positive stiffness mechanism and a negative stiffness mechanism which are connected in parallel, and the nonlinear stiffness of the system near the equilibrium position can be realized, so that the stiffness and structural parameters of the system are changed, the overall stiffness of the system is approximately zero at the static equilibrium position, and quasi-zero stiffness is generated, and the system can bear large load and is not easy to deform; the natural frequency of the system is low, the vibration reduction frequency band is widened, the vertical displacement of the urban rail vehicle body is finally reduced, and a good vibration reduction effect is achieved.
The transverse hydraulic spring mechanism 5 comprises a hydraulic cylinder 51, a spring 52 and a hinge device 53, wherein the spring 52 is sleeved outside the hydraulic cylinder 51.
The vertical hydraulic spring mechanism 7 and the transverse hydraulic spring mechanism 5 have the same structure.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The utility model provides a city rail vehicle automobile body dynamic vibration absorber based on quasi-zero rigidity principle which characterized in that: the vibration absorber comprises an underframe base (1), a regular hexagon box body (2), a screw mechanism (3), a regular hexagon limiting block mechanism (4), a transverse hydraulic spring mechanism (5), a circular vibrator mechanism (6) and a vertical hydraulic spring mechanism (7); chassis base (1) fixed mounting is in urban rail vehicle automobile body bottom middle part, and regular hexagon box (2) are installed on chassis base (1) through the bolt group, screw rod mechanism (3) fixed mounting has regular hexagon stopper mechanism (4) at the upper and lower both ends of circular oscillator mechanism (6), regular hexagon stopper mechanism (4) are fixed inside regular hexagon box (2) through horizontal hydraulic spring mechanism (5) and vertical hydraulic spring mechanism (7), vertical hydraulic spring mechanism (7) are the same with horizontal hydraulic spring mechanism (5) structure, including pneumatic cylinder (51), spring (52) and hinge means (53), spring (52) cover is outside in pneumatic cylinder (51).
2. The dynamic vibration absorber of the urban rail vehicle body based on the quasi-zero stiffness principle according to claim 1, wherein: chassis base (1) adopts the fluting design, and six top through-holes (12) of cooperation installation regular hexagon box (2) installation have in the inslot, and six sides respectively open there are two lateral wall through-holes (11) for fixed mounting is in city rail vehicle automobile body bottom.
3. The dynamic vibration absorber of the urban rail vehicle body based on the quasi-zero stiffness principle according to claim 1, wherein: six angles at the top of a regular hexagon box body (2) of the vibration absorber are provided with threaded holes (21) and are connected with an underframe base (1) through combination bolts, box wall threaded holes (22) are formed in the inner side wall of the vibration absorber and are used for fixing a transverse hydraulic spring mechanism (5) and a vertical hydraulic spring mechanism (7) respectively, and the horizontal height of the box wall threaded holes (22) for fixing the transverse hydraulic spring mechanism (5) is higher than that of the box wall threaded holes (22) for fixing the vertical hydraulic spring mechanism (7).
4. The dynamic vibration absorber of the urban rail vehicle body based on the quasi-zero stiffness principle according to claim 1, wherein: the screw mechanism (3) is composed of a threaded rod (31) and a hexagonal nut (32) and is used for fixing the regular hexagon limiting block mechanism (4) and the circular vibrator mechanism (6).
5. The dynamic vibration absorber of the urban rail vehicle body based on the quasi-zero stiffness principle according to claim 1, wherein: the upper surface and the lower surface of the regular hexagon limiting block mechanism (4) are respectively provided with six limiting block through holes (41) for installing a threaded rod (31), and the three side surfaces are respectively provided with two limiting block threaded holes (42) for connecting the transverse hydraulic spring mechanism (5) with the vertical hydraulic spring mechanism (7).
6. The dynamic vibration absorber of the urban rail vehicle body based on the quasi-zero stiffness principle according to claim 1, wherein: the transverse hydraulic spring mechanism (5) consists of a hydraulic cylinder (51), a spring (52) and a hinge device (53).
7. The dynamic vibration absorber of the urban rail vehicle body based on the quasi-zero stiffness principle according to claim 1, wherein: the transverse hydraulic spring mechanism (5) is fixedly connected between the regular hexagon box body (2) and the regular hexagon limiting block mechanism (4) through a hinge device (53) by bolts.
8. The dynamic vibration absorber of the urban rail vehicle body based on the quasi-zero stiffness principle according to claim 1, wherein: after the transverse hydraulic spring mechanism (5) is installed, the transverse hydraulic spring mechanism is located in a horizontal position and serves as a negative stiffness element, and a positive stiffness mechanism and a negative stiffness mechanism are formed in the regular hexagonal box body (2) in parallel with the vertical hydraulic spring mechanism (7) serving as a positive stiffness element, so that the stiffness and structural parameters of the system are changed, quasi-zero stiffness is generated, and nonlinear stiffness near a balance position is realized.
9. The dynamic vibration absorber of the urban rail vehicle body based on the quasi-zero stiffness principle according to claim 1, wherein: six vibrator through holes (61) are formed in the circular vibrator mechanism (6) and used for installing the threaded rod (31).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921735180.2U CN210859654U (en) | 2019-10-16 | 2019-10-16 | Dynamic vibration absorber of urban rail vehicle body based on quasi-zero stiffness principle |
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| CN201921735180.2U CN210859654U (en) | 2019-10-16 | 2019-10-16 | Dynamic vibration absorber of urban rail vehicle body based on quasi-zero stiffness principle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110608260A (en) * | 2019-10-16 | 2019-12-24 | 上海工程技术大学 | Mass-adjustable vibration absorber for urban rail vehicle and vibration reduction principle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110608260A (en) * | 2019-10-16 | 2019-12-24 | 上海工程技术大学 | Mass-adjustable vibration absorber for urban rail vehicle and vibration reduction principle |
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