CN110778672A - Planetary roller screw type inerter and inerter coefficient calculation method thereof - Google Patents
Planetary roller screw type inerter and inerter coefficient calculation method thereof Download PDFInfo
- Publication number
- CN110778672A CN110778672A CN201911105741.5A CN201911105741A CN110778672A CN 110778672 A CN110778672 A CN 110778672A CN 201911105741 A CN201911105741 A CN 201911105741A CN 110778672 A CN110778672 A CN 110778672A
- Authority
- CN
- China
- Prior art keywords
- planetary roller
- flywheel
- shell
- inerter
- screw
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- 238000004364 calculation methods Methods 0.000 title abstract description 5
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- 239000004809 Teflon Substances 0.000 claims description 3
- 238000004134 energy conservation Methods 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 230000000171 quenching Effects 0.000 claims description 3
- 238000010791 quenching Methods 0.000 claims description 3
- 229910052726 zirconium Inorganic materials 0.000 claims description 3
- 150000003754 zirconium Chemical group 0.000 claims description 2
- 230000002093 peripheral Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 3
- 239000000725 suspension Substances 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
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 [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
- F16H25/2247—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with rollers
- F16H25/2252—Planetary rollers between nut and screw
-
- 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
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/30—Flywheels
- F16F15/315—Flywheels characterised by their supporting arrangement, e.g. mountings, cages, securing inertia member to shaft
-
- 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
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/24—Elements essential to such mechanisms, e.g. screws, nuts
Abstract
The invention discloses a planetary roller screw type inerter and an inerter coefficient calculation method thereof, wherein the planetary roller screw type inerter comprises a shell, the shell comprises an upper shell and a lower shell, the upper shell and the lower shell are connected through bolts to form a cavity, a planetary roller screw type inerter assembly is arranged in the cavity, the planetary roller screw type inerter assembly comprises a central screw, a planetary roller, a shaft end baffle and a flywheel, the central screw is positioned at the center of the flywheel and is in threaded engagement with the planetary roller, two ends of the planetary roller are rotatably arranged in the shaft end baffle, the shaft end baffle is fixed at the center of the upper surface and the lower surface of the flywheel through screws, the planetary roller is in threaded engagement with the flywheel, and the flywheel is rotatably arranged in the cavity through a bearing. The invention adopts the planet roller and the flywheel to jointly generate inertia effect, and effectively improves the inertia-mass ratio and the applicability of the inertia container through the revolution and rotation dual motion of the planet roller.
Description
Technical Field
The invention relates to the technical field of inerter containers, in particular to a planetary roller screw type inerter container and an inerter coefficient calculation method thereof.
Background
The inerter is a novel two-end-point mechanical device with good low-frequency vibration isolation performance, has been well applied to the fields of automobile suspensions, train suspensions, aircraft undercarriages, high-rise buildings and the like, and has good low-frequency vibration attenuation effect in a vibration attenuation system.
The output force of the inerter is in direct proportion to the relative acceleration at two ends, the dynamic characteristic of large mass can be realized by small mass, and the structural form of vibration control is greatly widened. However, the inerter is a two-end element, and when the inerter is used as an inertial element in applications such as a dynamic vibration absorber, the action form of the inerter is greatly different from that of a single mass body, and the problems of narrowing of a vibration damping frequency band and the like are inevitably caused. In addition, the inerter with a fixed structure has the inherent defects that the structural parameters cannot be adjusted when the radial size of the flywheel is limited, and the inertia-mass ratio of the ball screw type inerter cannot be changed.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a planetary roller screw type inerter and an inerter coefficient calculation method thereof, and solves the technical problem that the inerter ratio of the conventional inerter with a fixed structure cannot be changed because structural parameters cannot be adjusted and the conventional inerter cannot adapt to variable vibration input when the radial size of a flywheel is limited.
The technical scheme is as follows: the invention discloses a planetary roller screw type inerter, which comprises a shell, wherein the shell comprises an upper shell and a lower shell, the upper shell and the lower shell are connected through bolts to form a cavity, a planetary roller screw type inerter assembly is arranged in the cavity, the planetary roller screw type inerter assembly comprises a central screw, a planetary roller, a shaft end baffle and a flywheel, the central screw is positioned at the center of the flywheel and is in threaded engagement with the planetary roller, two ends of the planetary roller are rotatably arranged in the shaft end baffle, the shaft end baffle is fixed at the center of the upper surface and the lower surface of the flywheel through screws, the planetary roller is in threaded engagement with the flywheel, and the flywheel is rotatably arranged in the cavity through a bearing.
Furthermore, the planet rollers are provided with a plurality of groups, the plurality of groups of planet rollers are annularly distributed on the periphery of the central screw rod by taking the center of the central screw rod as a circle center, and two ends of the plurality of groups of planet rollers are rotatably arranged on the shaft end baffle plate through the mounting holes in the shaft end baffle plate.
Furthermore, the outer ring of the bearing is clamped between the upper shell and the lower shell which are positioned in the cavity, the inner ring of the bearing is clamped on the side surface of the flywheel, and the flywheel and the shell are of a structure capable of rotating relatively.
Furthermore, a through hole is formed in the center of the upper shell, and the central screw rod penetrates through the through hole of the upper shell to move up and down; the lower shell is a hollow shell with a sealed bottom, the center of the bottom of the lower shell extends downwards to form a hollow cylindrical structure, the diameter of the hollow cylindrical structure is smaller than that of the lower shell, and the bottom end of the central lead screw moves up and down in the hollow cylindrical structure of the lower shell.
Furthermore, an upper lifting lug is arranged at the top end of the central screw rod extending out of the upper shell; and a lower lifting lug is arranged at the bottom end of the hollow cylindrical structure of the lower shell.
Further, the material of the planetary roller is zirconium or 30 Cr; and the thread parts of the central screw rod and the planetary roller are both subjected to quenching treatment or sprayed with Teflon.
The invention also comprises a method for calculating the inertance coefficient of the planetary roller screw type inerter, which comprises the following steps:
(1) let x
1、x
2Is the displacement of two ends of the inertia container, R is the radius of the outer ring of the flywheel, R
2The radius of the planetary roller is r, and the radius of the screw is r
1The height of the flywheel and the planet roller is h, and the height is obtained according to the law of energy conservation:
f-inertial container output force, J
FFlywheel moment of inertia, J
Z1-planetary roller selfMoment of inertia of rotation, J
Z2Planetary roller revolution moment of inertia, ω
FFlywheel-lead screw relative angular velocity, ω
Z1Planetary roller rotational angular velocity, ω
Z2-planetary roller revolution angular speed, N-number of planetary rollers;
the two sides of the formula (1) are differentiated simultaneously to obtain:
F(v
1-v
2)＝J
Fω
Fα
F+N(J
Z1ω
Z1α
Z1+J
Z2ω
Z2α
Z2) (2)
formula (III) α
FFlywheel-lead screw relative angular acceleration, α
Z1Acceleration of the rotational angle of the planet rollers, α
Z2Angular acceleration of revolution of planetary rollers, v
1、v
2-velocity at both ends of inerter;
(2) referring to a planetary gear train, the transmission relation of the lead screw, the planetary roller and the flywheel is as follows:
substituting the formulas (3) and (4) into the formula (2) to obtain:
according to the transmission relationship of the screw rod, the following steps are obtained:
in the formula p-lead screw lead, a
1、a
2-two-terminal acceleration;
substituting formula (6) into formula (5) to obtain:
(3) the density of the flywheel and the planetary roller is rho, and the mass of the flywheel and the planetary roller is as follows:
in the formula m
FFlywheel mass, m
Z-a single planetary roller mass;
the moment of inertia is:
substituting (9) into (7) to obtain:
according to the formula (10), the output force of the planetary roller type inerter is in direct proportion to the acceleration at two ends of the planetary roller type inerter, and the definition of the mechanical characteristics of the inerter is met; therefore, the specific expression of the inertance coefficient of the inerter is as follows:
the inertance coefficient b is determined by the planetary roller radius and height, the flywheel radius and height, the number of planetary rollers, the screw lead and radius, and the material density.
The working principle is as follows:
the inertia container is essentially a force amplification structure, when equal and opposite forces are applied to the centers of the upper lifting lug and the lower lifting lug along the axial direction, the upper lifting lug and the lower lifting lug do relative linear motion to generate relative displacement, the linear motion of the central screw rod is converted into the rotary motion of the flywheel and the planetary roller, and the central screw rod drives the planetary roller to rotate so as to drive the flywheel to rotate, so that the flywheel inertia is encapsulated. Inerter vessels are capable of converting several hundred kilograms of inertial mass into only several hundred grams of flywheel rotation, thereby absorbing external energy.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
compared with the traditional ball screw type inerter, the planetary roller type inerter has more inertial components and planetary rollers which can be used as transmission components at the same time, and the number and the radius of the planetary rollers can be adjusted when the radial size of a flywheel is limited, so that the inerter coefficient and the inerter ratio can be improved; when the radial size and the mass of the flywheel are the same, the acting force of the planetary roller type inerter is larger than that of the traditional roller screw type inerter, and the mechanical property of the planetary roller type inerter is obviously superior to that of the traditional roller screw type inerter.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is an enlarged view of the planetary roller screw inerter assembly of the present invention.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The invention is further described below with reference to the following figures and examples:
as shown in fig. 1 to 3, the planetary roller screw inertial container of the present invention comprises a housing, the housing comprises an upper housing 1 and a lower housing 2, the upper housing 1 and the lower housing 2 are connected by a bolt 12 to form a cavity 3, a planetary roller screw inertial container assembly is arranged in the cavity 3, the planetary roller screw inertial container assembly comprises a central screw 4, a planetary roller 5, a shaft end baffle 6 and a flywheel 7, the central screw 4 is located at the center of the flywheel 7 and is in threaded engagement with the planetary roller 5, the planetary roller 5 is made of zirconium or 30Cr, the threaded portions of the central screw 4 and the planetary roller 5 are respectively subjected to quenching treatment or spray coating with teflon which can increase the heat resistance and low friction of the threaded portions, two ends of the planetary roller 5 are rotatably mounted inside the shaft end baffle 6, the baffle 6 is fixed at the centers of the upper and lower surfaces of the flywheel 7 by a screw 13, the planetary roller 5 is meshed with the flywheel 7 through threads, and the flywheel 7 is rotatably arranged in the cavity 3 through a bearing 8;
the five groups of planet rollers 5 are distributed on the periphery of the central screw rod 4 in an annular array mode by taking the center of the central screw rod 4 as a circle center, two ends of the five groups of planet rollers 5 are rotatably arranged on the shaft end baffle 6 through mounting holes in the shaft end baffle 6, and bearings are arranged in the mounting holes;
the outer ring of the bearing 8 is clamped between the upper shell 1 and the lower shell 2 which are positioned in the cavity 3, and the inner ring of the bearing 8 is clamped on the side surface of the flywheel 7, so that the flywheel 7 and the shell are in a relative rotating structure;
a through hole is formed in the center of the upper shell 1, and the central screw rod 4 penetrates through the through hole of the upper shell 1 to move up and down; the lower shell 2 is a hollow shell with a sealed bottom, the center of the bottom of the lower shell 2 extends downwards to form a hollow cylindrical structure 9, the diameter of the hollow cylindrical structure 9 is smaller than that of the lower shell 2, and the bottom end of the central screw rod 4 moves up and down in the hollow cylindrical structure 9 of the lower shell 2; the top end of the central screw rod 4 extending out of the upper shell 1 is provided with an upper lifting lug 10; the bottom end of the hollow cylindrical structure 9 of the lower shell 2 is provided with a lower lifting lug 11,
when equal and reverse force is applied to the centers of the upper lifting lug 10 and the lower lifting lug 11 along the axial direction, the upper lifting lug 10 and the lower lifting lug 11 perform relative linear motion to generate relative displacement, the linear motion of the central screw rod 4 is converted into the rotary motion of the flywheel 7 and the planetary roller 5, the central screw rod 4 drives the planetary roller 5 to rotate so as to drive the flywheel 7 to rotate, and therefore the inertia of the flywheel 7 is encapsulated, and the inertia container can convert hundreds of kilograms of inertia mass into hundreds of grams of rotation of the flywheel 7, so that the external energy is absorbed;
the invention also comprises a method for calculating the inertance coefficient of the planetary roller screw type inerter, which comprises the following steps:
(1) let x
1、x
2Is the displacement of two ends of the inertia container, R is the radius of the outer ring of the flywheel, R
2The radius of the planetary roller is r, and the radius of the screw is r
1The height of the flywheel and the planet roller is h, and the height is obtained according to the law of energy conservation:
f-inertial container output force, J
FFlywheel moment of inertia, J
Z1Planetary roller self-rotating moment of inertia, J
Z2Planetary roller revolution moment of inertia, ω
FFlywheel-lead screw relative angular velocity, ω
Z1Planetary roller rotational angular velocity, ω
Z2-planetary roller revolution angular speed, N-number of planetary rollers;
the two sides of the formula (1) are differentiated simultaneously to obtain:
F(v
1-v
2)＝J
Fω
Fα
F+N(J
Z1ω
Z1α
Z1+J
Z2ω
Z2α
Z2) (2)
formula (III) α
FFlywheel-lead screw relative angular acceleration, α
Z1Acceleration of the rotational angle of the planet rollers, α
Z2Angular acceleration of revolution of planetary rollers, v
1、v
2-velocity at both ends of inerter;
(2) referring to a planetary gear train, the transmission relation of the lead screw, the planetary roller and the flywheel is as follows:
substituting the formulas (3) and (4) into the formula (2) to obtain:
according to the transmission relationship of the screw rod, the following steps are obtained:
in the formula p-lead screw lead, a
1、a
2-two-terminal acceleration;
substituting formula (6) into formula (5) to obtain:
(3) the density of the flywheel and the planetary roller is rho, and the mass of the flywheel and the planetary roller is as follows:
in the formula m
FFlywheel mass, m
Z-a single planetary roller mass;
the moment of inertia is:
substituting (9) into (7) to obtain:
according to the formula (10), the output force of the planetary roller type inerter is in direct proportion to the acceleration at two ends of the planetary roller type inerter, and the definition of the mechanical characteristics of the inerter is met; therefore, the specific expression of the inertance coefficient of the inerter is as follows:
the inertance coefficient b is determined by the planetary roller radius and height, the flywheel radius and height, the number of planetary rollers, the screw lead and radius, and the material density.
The inerter coefficient b of the invention is not only related to the radius and height of the flywheel, lead screw lead and radius and material density, but also related to the radius and height of the planet roller and the number of the planet rollers, when the radial size of the flywheel 7 is limited, the structure parameters can not be adjusted, the inerter ratio can not be changed in the prior inerter with a fixed structure, so that the inerter coefficient of the inerter is a fixed value, and when the radial size of the flywheel 7 is limited, the number and radius of the planet rollers 5 can be changed, so that when the radial size of the flywheel is limited, the inerter coefficient and the inerter ratio can be improved; the acting force of the planetary roller type inerter is larger than that of the traditional roller screw type inerter, and the mechanical property of the planetary roller type inerter is obviously superior to that of the traditional roller screw type inerter.
Claims (7)
1. The utility model provides a planet roller screw formula is used to container, includes the casing, its characterized in that: the shell comprises an upper shell and a lower shell, the upper shell and the lower shell are connected through a bolt to form a cavity, a planetary roller screw type inertial volume assembly is arranged in the cavity and comprises a central screw, a planetary roller, a shaft end baffle and a flywheel, the central screw is located at the center of the flywheel and is in threaded engagement with the planetary roller, two ends of the planetary roller are rotatably arranged in the shaft end baffle, the shaft end baffle is fixed at the center of the upper surface and the lower surface of the flywheel through screws, the planetary roller is in threaded engagement with the flywheel, and the flywheel is rotatably arranged in the cavity through a bearing.
2. The planetary roller screw inerter of claim 1, wherein: the planetary rollers are provided with a plurality of groups, the plurality of groups of planetary rollers are annularly arrayed and distributed on the peripheral side of the central screw rod by taking the center of the central screw rod as a circle center, and two ends of the plurality of groups of planetary rollers are rotatably arranged on the shaft end baffle plate through the mounting holes in the shaft end baffle plate.
3. The planetary roller screw inerter of claim 1, wherein: the outer ring of the bearing is clamped between the upper shell and the lower shell which are positioned in the cavity, the inner ring of the bearing is clamped on the side surface of the flywheel, and the flywheel and the shell are of a structure capable of rotating relatively.
4. The planetary roller screw inerter of claim 1, wherein: a through hole is formed in the center of the upper shell, and the central screw rod penetrates through the through hole of the upper shell to move up and down; the lower shell is a hollow shell with a sealed bottom, the center of the bottom of the lower shell extends downwards to form a hollow cylindrical structure, the diameter of the hollow cylindrical structure is smaller than that of the lower shell, and the bottom end of the central lead screw moves up and down in the hollow cylindrical structure of the lower shell.
5. The planetary roller screw inerter of claim 4, wherein: the top end of the central screw rod extending out of the upper shell is provided with an upper lifting lug; and a lower lifting lug is arranged at the bottom end of the hollow cylindrical structure of the lower shell.
6. The planetary roller screw inerter of claim 1, wherein: the material of the planet roller is zirconium or 30 Cr; and the thread parts of the central screw rod and the planetary roller are both subjected to quenching treatment or sprayed with Teflon.
7. A method for calculating an inerter coefficient of a planetary roller screw type inerter is characterized by comprising the following steps:
(1) let x
1、x
2Is the displacement of two ends of the inertia container, R is the radius of the outer ring of the flywheel, R
2The radius of the planetary roller is r, and the radius of the screw is r
1The height of the flywheel and the planet roller is h, and the height is obtained according to the law of energy conservation:
f-inertial container output force, J
FFlywheel moment of inertia, J
Z1Planetary roller self-rotating moment of inertia, J
Z2Planetary roller revolution moment of inertia, ω
FFlywheel-lead screw relative angular velocity, ω
Z1Planetary roller rotational angular velocity, ω
Z2Planetary roller revolution angular speed, N-planetThe number of rollers;
the two sides of the formula (1) are differentiated simultaneously to obtain:
F(v
1-v
2)＝J
Fω
Fα
F+N(J
Z1ω
Z1α
Z1+J
Z2ω
Z2α
Z2) (2)
formula (III) α
FFlywheel-lead screw relative angular acceleration, α
Z1Acceleration of the rotational angle of the planet rollers, α
Z2Angular acceleration of revolution of planetary rollers, v
1、v
2-velocity at both ends of inerter;
(2) referring to a planetary gear train, the transmission relation of the lead screw, the planetary roller and the flywheel is as follows:
substituting the formulas (3) and (4) into the formula (2) to obtain:
according to the transmission relationship of the screw rod, the following steps are obtained:
in the formula p-lead screw lead, a
1、a
2-two-terminal acceleration;
substituting formula (6) into formula (5) to obtain:
(3) the density of the flywheel and the planetary roller is rho, and the mass of the flywheel and the planetary roller is as follows:
in the formula m
FFlywheel mass, m
Z-a single planetary roller mass;
the moment of inertia is:
substituting (9) into (7) to obtain:
according to the formula (10), the output force of the planetary roller type inerter is in direct proportion to the acceleration at two ends of the planetary roller type inerter, and the definition of the mechanical characteristics of the inerter is met; therefore, the specific expression of the inertance coefficient of the inerter is as follows:
the inertance coefficient b is determined by the planetary roller radius and height, the flywheel radius and height, the number of planetary rollers, the screw lead and radius, and the material density.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111287916A (en) * | 2020-01-20 | 2020-06-16 | 武汉理工大学 | Tuned collision inerter mass damping device for fan |
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