CN108087473B - Gas-liquid bullet dual-frequency vibration isolator - Google Patents
Gas-liquid bullet dual-frequency vibration isolator Download PDFInfo
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- CN108087473B CN108087473B CN201711256485.0A CN201711256485A CN108087473B CN 108087473 B CN108087473 B CN 108087473B CN 201711256485 A CN201711256485 A CN 201711256485A CN 108087473 B CN108087473 B CN 108087473B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/06—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/3207—Constructional features
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/3207—Constructional features
- F16F9/3214—Constructional features of pistons
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/34—Special valve constructions; Shape or construction of throttling passages
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/44—Means on or in the damper for manual or non-automatic adjustment; such means combined with temperature correction
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Combined Devices Of Dampers And Springs (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The invention discloses a gas-liquid elastic dual-frequency vibration isolator, and belongs to the technical field of vibration isolation design. The method comprises the following steps: the air chamber comprises a shell, an inner cylinder, elastic rubber, a piston body, a lower cover body and an air chamber additional air chamber; one end of the inner cylinder is arranged in the shell, the elastic rubber is arranged between the shell and the inner cylinder, and the side surfaces of the elastic rubber are respectively bonded with the shell and the inner cylinder to form a sealed upper liquid cavity; the shell is circumferentially provided with anti-falling bolts to prevent the elastic rubber from falling off; one end of the inner cylinder is provided with an air compensation cavity, the air compensation cavity is provided with a piston body, a lower liquid cavity is formed between the piston body and the inner cylinder, and the lower liquid cavity is communicated with the upper liquid cavity; the air compensation cavity is provided with a lower cover body in inner threaded connection, and a cavity between the lower cover body and the piston body is communicated with the air cavity additional air chamber and used for changing the support rigidity of the piston body; the gas-liquid elastic double-frequency vibration isolator is arranged in a main support reducing rod of the helicopter through the shell and the lower cover body and is used for vibration isolation. The invention has the advantages of simple structure, light weight, wide vibration isolation frequency band, low dynamic rigidity of the antiresonance point and the like.
Description
Technical Field
The invention belongs to the technical field of vibration isolation design, and particularly relates to a gas-liquid elastic dual-frequency vibration isolator.
Background
Helicopter vibration is characterized in that typical periodic vibration related to rotor rotation speed frequency and random vibration are superposed, and the rotor vibration load is the most main vibration source through frequency spectrum analysis, particularly, the body vibration, component systems and the like caused by the integral multiple of rotor rotation speed frequency vibration load account for more than 90% of the total magnitude, and in the concerned frequency range (within 60 Hz), the performance of the helicopter is seriously influenced sometimes and becomes one of the core problems of modern helicopter development plans. Reducing the vibration level of a helicopter in flight is always an important problem to be researched and solved in the design process of the helicopter, and influences the comfort of a driver and passengers, the safety of a flight structure, the working environment of equipment and the like.
The rotor speed can be changed according to the demand in the flight process to arouse the rotational speed frequency to change, and then make rotor vibration excitation frequency change. Therefore, the vibration damper needs to be redesigned to reduce the vibration problem of the variable-speed helicopter.
The vibration control techniques currently applied and under study on helicopters can be generally divided into three categories:
1) vibration source vibration control techniques, such as hub vibration absorbers;
2) body structure vibration response control techniques, including passive/active control techniques;
3) and vibration transmission path control techniques such as active-minus-active/passive vibration isolation techniques.
The above-mentioned vibration control techniques all have their technical advantages and drawbacks, such as: the vibration reduction efficiency of the hub vibration absorber with invariable frequency is reduced quickly along with the change of the rotating speed; the passive vibration damping system has inherent limitations (large weight cost, narrow frequency band and limited vibration damping efficiency), and is difficult to meet the requirement of ensuring the vibration level of a helicopter body to be maintained at a low level in a wider flight envelope; the active vibration control technology can usually reduce the vibration by more than 70%, the design technology of the dynamic vibration absorber is mature, but the optimal installation position on the body structure and the optimal design of the parameters of the dynamic vibration absorber are the core technology of the vibration reduction design of the body structure. The traditional dynamic vibration absorption, main reduction and vibration isolation system is mechanical, and the lever swing arm needs a movement space and is limited by the strength and rigidity of a main reduction mounting structure. Therefore, the traditional vibration reduction mode cannot meet the requirement of multi-frequency vibration reduction of the variable-speed helicopter.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the problems, the invention provides a gas-liquid elastic dual-frequency vibration isolator which is arranged on a main damping support rod through an end bolt, elastic rigidity is provided by rubber, an exciting force is offset by pressure change of an upper liquid cavity and a lower liquid cavity generated by the movement of liquid in an inertia channel, and high vibration isolation efficiency can be achieved under designed vibration isolation frequency, so that the purposes of vibration attenuation and noise reduction are achieved, and meanwhile, the optimal vibration isolation frequency can be adjusted through a valve switch.
The technical scheme of the invention is as follows: a gas-liquid elastic dual-frequency vibration isolator comprises: the air chamber comprises a shell, an inner cylinder, elastic rubber, a piston body, a lower cover body and an air chamber additional air chamber;
one end of the inner cylinder is arranged in the shell and is sleeved with elastic rubber;
the elastic rubber is arranged between the shell and the inner cylinder, and the side surfaces of the elastic rubber are respectively bonded with the shell and the inner cylinder to form a sealed upper liquid cavity;
the shell is circumferentially provided with anti-falling bolts to prevent the elastic rubber from falling off;
an air compensation cavity is formed in one end, far away from the shell, of the inner cylinder, a piston body is arranged in the air compensation cavity, a lower liquid cavity is formed between the piston body and the inner cylinder, and the lower liquid cavity is communicated with the upper liquid cavity;
one end of the air compensation cavity, which is far away from the piston body, is provided with a lower cover body in threaded connection, and a cavity between the lower cover body and the piston body is communicated with the air cavity additional air chamber so as to change the support rigidity of the piston body;
the gas-liquid elastic double-frequency vibration isolator is arranged in a main support reducing rod of the helicopter through a shell and a lower cover body and is used for vibration isolation.
Preferably, the inner cylinder is a metal plug body, the metal plug body is provided with a liquid channel, and the liquid channel is used for connecting the upper liquid cavity and the lower liquid cavity.
Preferably, the air chamber additional air chamber is connected with the air compensation chamber through a compensation pipeline, and the compensation pipeline is provided with an adjusting valve;
and the rigidity of the bottom surface of the piston body is adjusted by opening or closing the valve, so that the vibration isolation frequency is adjusted.
Preferably, the shell positioned in the upper liquid cavity is provided with a liquid injection hole, and the liquid injection hole is communicated with the upper liquid cavity and used for filling or discharging liquid.
Preferably, the anti-falling bolt is arranged on one side of the elastic rubber close to the lower liquid cavity and used for limiting the lower edge of the elastic rubber;
the anti-falling bolt penetrates through the shell and is fixed in the inner cylinder.
The technical scheme of the invention has the beneficial effects that: the gas-liquid elastic dual-frequency vibration isolator has the advantages of simple structure, light weight, wide vibration isolation frequency band and the like; meanwhile, the device has the same high static rigidity as the stay bar, and the required low dynamic rigidity is achieved under the required vibration isolation frequency, so that effective vibration isolation is completely guaranteed, meanwhile, the rotor and the main damper cannot generate larger static displacement in the flying process to influence the flying control and safety, and the gas-liquid elastic double-frequency vibration isolation device adopts liquid as an inertia element, has larger equivalent force arm, and effectively cancels a mechanical lever and abrasion generated by the mechanical lever.
Drawings
Fig. 1 is a structural schematic diagram of a preferred embodiment of the gas-liquid elastic double-frequency vibration isolator;
FIG. 2 is a schematic diagram of a mechanical model of a preferred embodiment of the gas-liquid elastic dual-frequency vibration isolator according to the invention;
FIG. 3 is a schematic diagram of the working principle of a preferred embodiment of the gas-liquid elastic dual-frequency vibration isolator according to the invention;
the device comprises a shell, an inner cylinder, an elastic rubber, a piston body, a lower cover body, an air cavity additional air chamber, an upper liquid cavity, an anti-falling bolt, an air compensation cavity, a lower liquid cavity, a liquid channel and an adjusting valve, wherein the shell is 1, the inner cylinder is 2, the elastic rubber is 3, the piston body is 4, the lower cover body is 5, the air cavity additional air chamber is 6, the upper liquid cavity is 7, the anti-falling bolt.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the scope of the present invention.
As shown in fig. 1, a gas-liquid elastic dual-frequency vibration isolator includes: the device comprises a shell 1, an inner cylinder 2, elastic rubber 3, a piston body 4, a lower cover body 5 and an air cavity additional air chamber 6;
one end of the inner cylinder 2 is arranged inside the shell 1 and is sleeved with the elastic rubber 3, the elastic rubber 3 is arranged between the shell 1 and the inner cylinder 2, the side surfaces of the elastic rubber 3 are respectively bonded with the shell 1 and the inner cylinder 2 to form a sealed upper liquid cavity 7, and when vertical relative motion occurs between the shell 1 and the inner cylinder 2, the elastic rubber 3 generates shearing deformation and provides elastic rigidity.
The anti-falling bolt 8 is arranged on the periphery of the shell 1, the anti-falling bolt 8 is installed on one side, close to the lower liquid cavity 10, of the elastic rubber 3 and used for limiting the lower edge of the elastic rubber 3, and the anti-falling bolt 8 penetrates through the shell 1 and is fixed in the inner barrel 2 to prevent the elastic rubber 3 from falling off and moving too much;
an air compensation cavity 9 is arranged at one end of the inner cylinder 2, which is far away from the shell 1, and is used for volume compensation and certain rigidity providing during liquid elastic vibration reduction deformation; the air compensation cavity 9 is provided with a piston body 4, a lower liquid cavity 10 is formed between the piston body 4 and the inner cylinder 2, and the lower liquid cavity 10 is communicated with the upper liquid cavity 7;
in this embodiment, the inner cylinder 2 is a metal plug body, the metal plug body is provided with a liquid channel 11, and the liquid channel 11 is used for connecting the upper liquid cavity 7 and the lower liquid cavity 10.
When the shell 1 and the inner cylinder 2 move vertically, liquid flows in the upper cavity and the lower cavity through the liquid channel, and frictional resistance and inertia force are generated.
One end of the air compensation cavity 9, which is far away from the piston body 4, is provided with a lower cover body 5 which is internally screwed, and a cavity between the lower cover body 5 and the piston body 4 is communicated with an air cavity additional air chamber 6 so as to change the support rigidity of the piston body 4;
the gas-liquid elastic double-frequency vibration isolator is arranged in a main support reducing rod of the helicopter through the shell 1 and the lower cover body 5 and is used for vibration isolation.
In this embodiment, the housing located in the upper liquid chamber 7 is provided with a liquid injection hole, which communicates with the upper liquid chamber 7 for filling or discharging liquid.
Assuming that the top area of the upper liquid cavity is A1, the bottom area of the lower liquid cavity is A2, the area of the liquid channel is A0, the dynamic rigidity of rubber between the outer cylinder and the inner cylinder is K1, the equivalent rigidity of the air compensation cavity is K2, the mass of liquid in the liquid channel is M, the connecting mass of the lower end of the inner cylinder is M1, and the connecting mass of the upper end of the outer cylinder is M2. The mechanical model can be equivalently shown in fig. 2.
Under the action of the vertical force fs, the displacement of the lower end is X1, and the displacement of the upper end is X2. The displacement of the fluid movement within the fluid passageway is X0 and the displacement of the lower chamber fluid movement relative to the housing is Xd. The pressure of the liquid on the bottom of the lower cavity is recorded as f2, the pressure of the lower cavity is recorded as P2, the pressure of the liquid on the top of the upper cavity is recorded as f1, the pressure of the upper cavity is recorded as P1, the pressure direction of the liquid is the same as the normal direction of the acting surface of the liquid, so the pressure is a scalar quantity and has no direction, and the positive and negative of the pressure indicate the increase or decrease of the pressure relative to the original equilibrium position.
When the liquid flows in the inertia channel, the liquid will be subjected to viscous damping force generated by the viscosity of the fluid and local loss damping force generated by the expansion and contraction of the channel, and the loss coefficient of the rubber is η given the damping coefficient c.
Suppose that:
R1＝A1/A0 R2＝A2/A0 (1)
the balance equation of the fluid M in the liquid cavity channel 11, the mass connected with the upper end of the fluid M is M1, and the mass connected with the lower end of the fluid M is M2, wherein the equation of continuity of the fluid A0 & X0 is A1 (X1-X2) is A2 & X2, the equation of pressure P2 is (-K2 & X2)/A2:
it can be obtained that when f is frequency ω harmonic excitation, the vibration isolator makes the vibration of the object to be isolated approach 0, and the optimal vibration isolation frequency is:
the vibration isolation principle of the device is as follows:
in fig. 3, 6 is an additional air chamber of the air chamber, which is connected to the air compensation chamber 9 by means of an adjustable valve 12, when the valve is closed. The dynamic stiffness of the air cavity is:
wherein α, β are parameters relating to the shape of the air cavity, α is positive, β is negative, k is the adiabatic exponent of the air cavity, here considered as constant term, Ps is the gas pressure in the air compensation cavity 9 and the additional air chamber 6 of the air cavity, AeIs the effective contact area, V, of the piston body 4 with the air compensation chamber 9sThe volume of the chamber 9 is compensated for by air.
When the valve is open, because of the frequency of vibration isolation and A3The ratio between f and A, assuming the frequencies to be isolated, will influence the flow of air in the valve3If the ratio of (a) to (b) is sufficiently small (i.e. if the valve opening is sufficiently large), the dynamic stiffness of the air chamber and the additional air chamber is expressed as follows:
wherein, VaIs the volume of the additional air chamber.
As can be seen from the above two formulas (4) and (5), when the valve is opened, (V)s+Va) The volume of the air compensation cavity is larger than that of the original air compensation cavity, and the air isThe dynamic stiffness of the spring is reduced, and the optimum vibration isolation frequency of the vibration isolator is reduced according to the optimum vibration isolation frequency formula (3) of the front-speed vibration isolator.
The gas-liquid bullet dual-frequency vibration isolator can be designed to realize corresponding functions according to excitation frequency and excitation amplitude: first, instead of providing stiffness with a spring, providing a base load and displacement, i.e. a high static stiffness; secondly, damping is provided, and higher damping can be provided at and near the anti-resonance point; thirdly, the adjustable vibration absorption function can achieve the purpose of isolating vibration under specific frequency by changing the density of liquid or the channel ratio, namely low dynamic stiffness under the specific frequency; fourthly, the double-frequency vibration isolation function can dynamically change the optimal vibration isolation frequency of the vibration isolator through the switch of the valve.
Compare traditional isolator, this kind of gas-liquid bullet dual-frenquency isolator utilizes soft rubber layer to absorb vibration better, and utilize the liquid in the sealed chamber to provide the damping, make resonance state or vibration impact displacement reduce down, gas-liquid bullet vibration isolator can design into the static rigidity the same high with the vaulting pole, and reach the low dynamic rigidity that needs under required vibration isolation frequency, thereby when guaranteeing effective vibration isolation completely, the rotor reduces can not produce great static displacement and influence flight control and safety at the flight in-process with the owner, thereby can be better improve the reliability of riding comfort and complete machine, help promoting the competitiveness in the development level and the market of the civilian helicopter of china.
The other performance of the gas-liquid elastic double-frequency vibration isolator is the conveniently adjustable vibration absorption function. In a specific frequency point or frequency range, the liquid flows in the cavity to replace the traditional anti-resonance mass block, and the acceleration flow of a small amount of liquid in a cavity thin tube is used for replacing the amplification effect of a lever, so that a large inertial load is generated to offset the vibration load of the rotor. In general, dynamic stiffness is less than static stiffness in the frequency range. The vibration absorption function can well play a role in vibration absorption and noise reduction under the main frequency. Meanwhile, the valve switch can be controlled according to the rotating speed state of the rotor wing to adjust the optimal vibration isolation frequency of the vibration isolator, so that the vibration isolation efficiency is higher in each state.
The gas-liquid elastic dual-frequency vibration isolator mainly comprises rubber, liquid, an air cavity and metal, can be mounted on a main strut of a helicopter to achieve the purposes of vibration and noise reduction, and has the advantages of simple structure, light weight, wide vibration isolation frequency band, low dynamic rigidity of an anti-resonance point, high static rigidity of a non-anti-resonance region, frequency modulation and the like, and the vibration and noise reduction effect is more effective than that of the traditional vibration isolator.
Finally, it should be pointed out that: the above examples are only for illustrating the technical solutions of the present invention, and are not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (5)
1. The utility model provides a gas-liquid bullet dual-frenquency isolator which characterized in that: the method comprises the following steps: the air-conditioning device comprises a shell (1), an inner cylinder (2), elastic rubber (3), a piston body (4), a lower cover body (5) and an air cavity additional air chamber (6);
one end of the inner cylinder (2) is arranged in the shell (1) and is sleeved with elastic rubber (3);
the elastic rubber (3) is arranged between the shell (1) and the inner cylinder (2), and the side surfaces of the elastic rubber are respectively bonded with the shell (1) and the inner cylinder (2) to form a sealed upper liquid cavity (7);
the shell (1) is circumferentially provided with anti-falling bolts (8) for preventing the elastic rubber (3) from falling off;
an air compensation cavity (9) is formed in one end, far away from the shell (1), of the inner cylinder (2), a piston body (4) is arranged in the air compensation cavity (9), a lower liquid cavity (10) is formed between the piston body (4) and the inner cylinder (2), and the lower liquid cavity (10) is communicated with the upper liquid cavity (7);
one end of the air compensation cavity (9) far away from the piston body (4) is provided with a lower cover body (5) which is internally screwed, and a cavity between the lower cover body (5) and the piston body (4) is communicated with the air cavity additional air chamber (6) so as to change the support rigidity of the piston body (4);
the gas-liquid elastic double-frequency vibration isolator is arranged in a main support reducing rod of the helicopter through a shell (1) and a lower cover body (5) and is used for vibration isolation.
2. The gas-liquid elastic double-frequency vibration isolator is characterized in that: the inner cylinder (2) is a metal plug body, the metal plug body is provided with a liquid channel (11), and the liquid channel (11) is used for connecting the upper liquid cavity (7) and the lower liquid cavity (10).
3. The gas-liquid elastic double-frequency vibration isolator is characterized in that: the air cavity additional air chamber (6) is connected with the air compensation cavity (9) through a compensation pipeline, and the compensation pipeline is provided with an adjusting valve (12);
the rigidity of the bottom surface of the piston body (4) is adjusted through the opening or closing of the valve (12), and then the vibration isolation frequency is adjusted.
4. The gas-liquid elastic double-frequency vibration isolator is characterized in that: and a liquid injection hole is formed in the shell positioned in the upper liquid cavity (7), and the liquid injection hole is communicated with the upper liquid cavity (7) and is used for filling or discharging liquid.
5. The gas-liquid elastic double-frequency vibration isolator is characterized in that: the anti-falling bolt (8) is arranged on one side, close to the lower liquid cavity (10), of the elastic rubber (3) and used for limiting the lower edge of the elastic rubber (3);
the anti-falling bolt (8) penetrates through the shell (1) and is fixed in the inner cylinder (2).
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| CN201711256485.0A CN108087473B (en) | 2017-12-03 | 2017-12-03 | Gas-liquid bullet dual-frequency vibration isolator |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109538678A (en) * | 2018-11-15 | 2019-03-29 | 中国直升机设计研究所 | A kind of liquid bullet vibration isolator of high Static stiffness |
| CN109372933A (en) * | 2018-11-15 | 2019-02-22 | 中国直升机设计研究所 | It is a kind of to be series at the main liquid bullet vibration isolator for subtracting strut |
| CN110296171B (en) * | 2019-05-24 | 2020-11-20 | 南京航空航天大学 | Helicopter main reduction period support rod with spiral structure |
| CN111918502A (en) * | 2020-08-18 | 2020-11-10 | 马鞍山英维爱生态科技有限公司 | Impact-resistant heating type main control box |
| CN112178111A (en) * | 2020-09-25 | 2021-01-05 | 中国直升机设计研究所 | Inner cylinder embedded type liquid elastic vibration isolator |
| CN112178110B (en) * | 2020-09-25 | 2022-06-21 | 中国直升机设计研究所 | Liquid elastic vibration isolator capable of achieving assembly type frequency modulation |
| CN112178112A (en) * | 2020-09-25 | 2021-01-05 | 中国直升机设计研究所 | Double piezoelectric type active liquid elastic vibration isolation device and method |
| CN112172632B (en) * | 2020-09-25 | 2022-12-30 | 中国直升机设计研究所 | Variable-pressure active liquid vibration isolation seat system |
| CN114017458B (en) * | 2021-10-09 | 2023-11-07 | 中国直升机设计研究所 | Hydraulic frequency modulation type semi-active hydraulic bomb vibration isolation device |
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| US6340153B1 (en) * | 2000-11-02 | 2002-01-22 | General Dynamics Advanced Technology Systems, Inc. | Shock and acoustic mount |
| US9765641B2 (en) * | 2012-08-23 | 2017-09-19 | Bell Helicopter Textron Inc. | System and method for vibration isolation |
| CN105082916A (en) * | 2014-05-21 | 2015-11-25 | 盐城工业职业技术学院 | Electronic control air suspension system control strategy employing pressure adjustment of auxiliary air chamber |
| CN204150863U (en) * | 2014-10-08 | 2015-02-11 | 日立电梯（中国）有限公司 | A kind of elevator vibration isolation guide piece |
| CN105351421A (en) * | 2015-11-19 | 2016-02-24 | 成都九十度工业产品设计有限公司 | Hydro-pneumatic suspension device |
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