Method for reducing vibration of rotating object

Abstract

The invention discloses a method for reducing eccentric vibration of a rotator. If one mass point has a movement range of a curve, and the mass point and the curve integrally rotate around a center, if the position of the mass point, the normal of the curve and the center of the circle coincide, the mass point can be static relative to the curve. If the position of the mass point, the normal of the curve and the center do not coincide, the mass point generates acceleration relative to the curve and finally generates displacement, and the displacement enables the total mass center of the system to approach the normal. According to the innovation, the point is fully utilized, and vibration of a rotating system is reduced or eliminated.

Description

Technical Field

[0001] The present invention relates to the field of machinery, and more specifically, to the field of white goods. Background Art

[0002] In the current rotation system, the center of mass and the actual mechanical rotation center often cannot overlap strictly. In this way, during the rotation process of the system, there will always be vibrations. For example, in a washing machine, when the clothes are being dried, the drum rotates at a high speed. Because the common center of mass of the clothes and the drum often does not lie on the axis of the drum's rotating shaft, the rotation system composed of the entire drum and all the clothes is an eccentric rotation system. As a result, the drum generates a large amount of vibration, causing the entire washing machine to vibrate as a whole.

[0003] Most of the current methods for reducing vibration are to add counterweights with a large mass, so the washing machine is very heavy. Patents 200710126560, CN20201112204, and 20202934660.0 have made many ingenious designs in reducing vibration, but they are not perfect either. Summary of the Invention

[0004] This patent realizes a solution for reducing or eliminating the vibration of the rotation system, thereby making the rotation smoother. For example, when the drum of a washing machine is drying clothes, it can rotate smoothly without a very heavy counterweight.

[0005] In a rotation system with an angular velocity of ω, for any particle with a mass of m and a rotation radius of r, the resultant force f exerted on it by the outside world; relative to the rotation system, if the direction of f points to the center of rotation; then, this particle may remain stationary and rotate with the rotation system.

[0006] Otherwise, the particle will generate an acceleration and finally displace, and it cannot maintain this circular motion.

[0007] If a particle moves within the range of a curve, and the particle and the curve as a whole rotate around a center, then, if the normal line of the curve at the position of the particle coincides with this center, the particle can be stationary relative to the curve.

[0008] If the normal line of the curve at the position of the particle does not coincide with this center, then relative to the curve, the particle will generate an acceleration and finally will generate a displacement, and this displacement causes the total center of mass of the system to approach the normal line.

[0009] This innovation makes full use of this point to realize the reduction or elimination of the vibration of the rotation system. Brief Description of the Drawings

[0010] The drawings are schematic diagrams of some principles and implementation devices of the present invention.

[0011] Figures 1 to 6Schematic diagram of the shock absorption principle; Figures 7 to 18 Schematic diagram of the implementation device.

[0012] The following is an optional detailed description of the present invention in conjunction with the accompanying drawings.

[0013] Among them: for the convenience of expression, the following contents are defined.

[0014] The system composed of the rotating body, all moving mass points, moving curves, and all objects participating in rotation is called the "rotation system".

[0015] The direction of OL: refers to the vector direction from point O to point L, and the same applies to others.

[0016] Ray LR: The set of all points on the straight line LR starting from point L and extending in the R direction.

[0017] Spring center line: The straight line formed by the centers of each coil of the spring.

[0018] Spring origin: The point where the centroid of the moving mass point M is located when the spring is at its original length.

[0019] In each figure, it includes:

[0020] S: The moving curve S, which is the set of all points that the centroid of the moving mass point M can reach; the moving curve S rotates with the rotating body. In the rotation system, relative to the rotating body, this curve can be any ordinary curve or a special curve, such as a circle, a broken line, various conic curves, or a straight line, and the curve can also have inflection points.

[0021] S1, S2, and S3: One of S, used as an identifier for distinguishing and explaining.

[0022] E: A point on S.

[0023] L: A point on S.

[0024] M: The moving mass point M. It is a moving mass point that can move on S.

[0025] N: A point on S.

[0026] R: The normal line LR of the moving mass point M at L.

[0027] T: The intersection point T of the normal line LR and the ray OP, where O is the endpoint of the ray OP.

[0028] m: The mass of M.

[0029] O: The real-time rotation center O. When the rotation system rotates, the real-time rotation center is called the "real-time rotation center".

[0030] w: The real-time angular velocity when the rotation system rotates.

[0031] Q: Total centroid Q. The overall centroid of the rotating system is called the "total centroid".

[0032] P: Ideal center of rotation P. When the rotating body rotates, the point with an unchanged position relative to the rotating body bracket is called the "ideal center of rotation". If Q and P coincide, then O will also coincide with P, the rotating system has no eccentricity, rotates smoothly, and does not generate vibration externally. During the actual operation of the equipment, Q and P do not coincide. Therefore, the rotating system will rotate eccentrically, causing eccentric vibration. The purpose of this innovation is to make Q approach P or coincide with P, thereby reducing vibration.

[0033] AB: Tangent AB of S at point E.

[0034] CD: Tangent CD of S at point L.

[0035] F: When the rotating system rotates, ignoring friction and only considering the shape and movement of S, the force exerted on M is F.

[0036] G: EG is the normal line of S,

[0037] H: LH is the normal line of S.

[0038] J, K: LH can be decomposed into two vector components LJ and LK. Therefore, LJ and LK must be on both sides of LH, J is on the line segment LO, and K is on the line segment CD.

[0039] d: Figure 6 During the rotation of the rotating system, the length by which the spring changes.

[0040] x: Figure 6 During the rotation of the rotating system, the projection length of the line segment with the spring origin and the real-time center of rotation O as endpoints on the spring center line.

[0041] Y: Figure 6 During the rotation of the rotating system, the position where M is located.

[0042] YZ: Figure 6 During the rotation of the rotating system, after the spring length changes, the force exerted by the spring on M.

[0043] a: Figure 6 The magnitude of ∠PYQ.

[0044] YV: Figure 6 During the rotation of the rotating system, the resultant force received by the moving mass point M.

[0045] YU: Figure 6 During the rotation of the rotating system, the force received by the moving mass point M from the track edge 5.

[0046] 1. Pendulum shaft 1

[0047] 2. Small wheel 2

[0048] 3. Spring piece 3

[0049] 4. Vehicle body 4

[0050] 5. Track edge 5

[0051] 6. Rotating shaft 6

[0052] 7. Fixed ring 7

[0053] 8. Rotating body 8

[0054] 9. Motor 9

[0055] 10. Movable support 10

[0056] 11. Fixed support 11

[0057] 12. Cart wheel spring 12

[0058] 13. Support spring 13

[0059] Pendulum rotating shaft 1: As shown as 6 in the figure, mass point M. In specific implementation, it can be a pendulum, and the pendulum can rotate around the rotating shaft, so the movement curve S of M is a circle.

[0060] Small wheel 2: The wheel of the cart, which can roll on the track wall of the track S

[0061] Spring piece 3: A spring piece with elasticity. After being compressed, it will deform. The wheel of the cart is connected to the vehicle body 4 through the spring piece 3.

[0062] Vehicle body 4: It has mass. The vehicle body of the cart is connected to the small wheel 2 through the spring piece 3. When the movement curve S is stationary, the spring piece 3 is not deformed, and the vehicle body 4 and the track edge 5 maintain pressure contact and have static friction; when the movement curve S starts to rotate, the vehicle body 4 and the track edge 5 are still in contact and have static friction. Therefore, the vehicle body 4 will follow the movement curve S to accelerate and rotate in a timely manner; when the rotation speed w of the movement curve S reaches a critical value, due to the centrifugal effect of the vehicle body 4, it will compress the spring piece 3 to deform. Therefore, the vehicle body 4 and the track edge 5 are separated, and the static friction between the vehicle body 4 and the track edge 5 is released. Relative to the movement curve S, the cart starts to move to a new equilibrium position.

[0063] Track edge 5: The edge of the movement curve S. It rotates with the rotating body.

[0064] Rotating shaft 6: The shaft around which the rotating body 8 rotates; optionally, in a real rotating body, there may be no rotating shaft 6.

[0065] Fixed ring 7: Used to be installed in the rotating system, and the pendulum rotating shaft 1 is installed on the fixed ring 7.

[0066] Rotating body 8: The rotating body of the rotating body that needs to reduce vibration

[0067] Motor 9: Motor 9 for driving the rotation of the rotating body 8

[0068] Movable support 10: Used to support the rotating shaft 6.

[0069] Fixed support 11: Used to connect to the external support device.

[0070] Trolley wheel spring 12: Connects the movable support 10 and the fixed support 11. The movable support 10 may be affected by the vibration of the rotating shaft 6, and this vibration is buffered by the trolley wheel spring 12 and weakened when transmitted to the fixed support 11.

[0071] Support spring 13: A spring connecting the movable mass point M on the movable curve S; this spring can also be other deformable devices, such as rubber, rubber bands, and spring sheets. Detailed implementation method

[0072] Schematic description of the principle.

[0073] If the rotating system rotates around point O, then.

[0074] a. As Figure 1 , M is at point E. If G is on the straight line OE.

[0075] Then, the force F at point E will point to the center O. There is no component force of the support force F in the direction other than the OE direction. That is, the movable mass point M has no acceleration in the AB direction and may be stationary relative to S. The entire circular motion where S is located can be stable and continuous.

[0076] b. As Figure 1 , the movable mass point M at point L, and H is not on the straight line LO.

[0077] If friction is ignored and there is only the force F exerted by S on M, and the force LH exerted by the movable curve S on M is only perpendicular to CD, then LO and LH do not coincide and there is an included angle ∠HLJ.

[0078] Relative to S, the acceleration that M can generate can only be the centripetal acceleration in the LO direction and the relative displacement acceleration in the CD direction; in other directions, it is restricted by the shape of S and its circular motion. Therefore, the result of the action of LH can only be reflected in the CD and LO directions. According to the principle of vector decomposition, LH can be decomposed into two component forces, LJ and LK. The acceleration generated by LJ and LK can be observed. LJ shows the centripetal acceleration, and LK shows that relative to S, M will have an acceleration in the LK direction. This acceleration can ultimately become the displacement of M in the LK direction.

[0079] The direction of this displacement is in the opposite direction of O with the normal line LH as the boundary.

[0080] Summary: The moving particle M is on the moving curve S, at position L. The normal line of the moving curve S is LH. When M and S rotate around the real-time center of rotation O, if the real-time center of rotation O is not on the normal line LH; then, the moving particle M will move, and the moving direction is the LD direction, that is, from the other side of the normal line LH, away from the real-time center of rotation O. This is called the "phenomenon of moving away from the real-time center of rotation".

[0081] The above is the state of ignoring friction and only considering the force F exerted by S on M; generally, during the rotation of the rotating system, the moving particle M moves on the moving curve S and also rotates. Then, relative to the moving curve S; considering all actual factors, regardless of the final motion trajectory, including the deformation of S itself during rotation, for example Figure 14 In the case where the particle M is connected to the support spring 13, during rotation, the support spring 13 will deform; due to the centrifugal effect, M always has a tendency to move away from O, and the direction of this tendency is along the radial direction of the radius of rotation, that is, the OL direction at point L. If the support of the moving curve S on M at point L cannot keep it in balance, then, if the normal tangent CD and OL are not perpendicular, that is, the normal line LH and OL do not coincide, M will move to the other side of the normal line LH from point O. That is, the phenomenon of moving away from the real-time center of rotation still exists.

[0082] c. For example Figure 2 when the rotating system rotates.

[0083] If Q and P do not coincide, then.

[0084] If the rotating system is an isolated system, then, the system will rotate around the total center of mass Q.

[0085] In reality, the rotating system is installed on an external support, and the position of the support and the ideal center of rotation P remains fixed, while the total center of mass Q will try to make the rotating system rotate around the total center of mass Q, causing the support to vibrate accordingly.

[0086] The support is pulled by the ideal center of rotation P to rotate around the total center of mass Q, which will generate an elastic force. This elastic force will resist this rotation and will pull the real-time center of rotation O from Q towards P. Thus, O will be located between P and Q and does not coincide with either P or Q. In real time, the rotating system rotates around O, and both P and Q rotate around O.

[0087] At this time, relative to the outside world, P rotates around O, and this rotation will be transmitted to the support. In this way, it causes the support to vibrate, and the vibration amplitude is positively correlated with the length of OP.

[0088] At this time, at point L, if there is a moving particle M, according to the phenomenon of moving away from the real-time center of rotation, the particle M will move in the LD direction, thus causing the total center of mass Q to move in the same direction, and correspondingly, O also moves in the same direction.

[0089] If the normal line LR and the ray OP have an intersection point T, then, as the moving particle M moves (when T and O coincide, the particle M is regarded as moving with an acceleration of 0), the total centroid Q will move towards LR, and thus, the real-time center of rotation O also moves towards LR, which is called the "phenomenon of approaching the normal line".

[0090] Because, relative to O, LR and P are on the same side, then, according to the phenomenon of approaching the normal line, the real-time center of rotation O will approach the ideal center of rotation P, and thus, OP decreases; because the magnitude of the system vibration is positively correlated with the length of OP, so, when OP decreases, the vibration decreases.

[0091] Summary: Starting from the real-time center of rotation O, the ray towards the ideal center of rotation P, within the range of this ray OP; the moving particle M at the position L on the moving curve S, the normal line LR; only need to make the ray OP and the normal line LR have an intersection point T; then, when the rotating system rotates around the real-time center of rotation O, the moving particle M will move, and finally, cause the real-time center of rotation O to approach the ideal center of rotation P, which is called the "phenomenon of approaching the ideal center of rotation", and the phenomenon of approaching the ideal center of rotation reduces the vibration of the ideal center of rotation P.

[0092] Furthermore, if the ideal center of rotation P is on LR, then, when S1 rotates around the real-time center of rotation O, if the real-time center of rotation O and the ideal center of rotation P do not coincide, according to the phenomenon of approaching the ideal center of rotation, the real-time center of rotation O approaches the ideal center of rotation P, thereby reducing the vibration of the rotating system.

[0093] Optionally, the moving curve S is not limited to a circle, an ellipse or a straight line, and can be an arbitrary ordinary curve.

[0094] Optionally, for the same rotating system, the number and type of the moving curves S are not limited, and can be any natural number and any type, as long as the moving particle M can move on the moving curve S; the number of moving particles M on the same moving curve is also not limited, and can be 0 or any natural number; for the same rotating system, the shape of the moving curve S can be random and does not need to be the same.

[0095] d. As Figure 3 , based on the above phenomena, if friction is ignored and only the action of the rigid moving curve S on the moving particle M is considered, then the direction of the resultant force on M at a point is the normal direction of S at that point; if the normal line LH on S2, the normal line EG on S1, and the normal line ON on S3 are made to intersect at the ideal center of rotation P simultaneously.

[0096] As Figure 3 In the left figure a in, if P and Q coincide, then, O and P will also coincide. Relative to S1, the moving particles at E, L, and N can all maintain the overall rotation of M and S, without eccentricity and vibration, and the rotation is stable.

[0097] As Figure 3In the right middle figure b, if P and Q do not coincide,

[0098] Based on the phenomenon of approaching the ideal center of rotation, the moving particle at point L will move, causing the real-time center of rotation O to move towards P.

[0099] Similarly, the moving particle at point E will move, and this movement causes O to move towards P.

[0100] Similarly, the movement of all other moving particles causes O to move towards P. From all directions, it causes OP to decrease, that is, the radius of rotation of P decreases.

[0101] Therefore, the movement of all moving particles will cause O to move towards P from all directions, thereby reducing the length of OP, that is, reducing the vibration radius of P and reducing vibration.

[0102] e. Further, as Figure 4 , if friction is ignored and only the effect of the rigid moving curve S on the moving particle M is considered, then the direction of the resultant force on M at a point is the normal direction of S at that point.

[0103] If S is a circle or an arc centered at the ideal center of rotation P, then when M and S rotate around the real-time center of rotation O.

[0104] a) If Q and O coincide, then P and O also coincide. Thus, relative to S, all moving particles can remain stationary, the rotation is stable, and there is no vibration.

[0105] b) If Q and O do not coincide, then P and O do not coincide either, as Figure 4 , left figure a.

[0106] Then, according to the phenomenon of approaching the ideal center of rotation, the moving particle at E will move clockwise along S relative to S. This movement causes the real-time center of rotation O to move towards P. At the same time, PE also rotates clockwise.

[0107] Similarly, the moving particle at L will rotate counterclockwise along S relative to S, and at the same time, LP will also rotate counterclockwise.

[0108] Finally, when the rotation system is stable, relative to S, each moving particle is relatively stationary; P, O, and Q coincide, as Figure 4 , right figure b, the system rotates smoothly without vibration. Thus, the vibration is completely eliminated.

[0109] For the convenience of expression, the above analysis is carried out taking circular motion as an example. In the actual rotation process, it is not necessarily a uniform rotation, nor necessarily a circular motion, or even a complex rotation; the final results of the phenomena of moving away from the real-time center of rotation, approaching the normal line, and approaching the ideal center of rotation are still applicable. Thus, the vibration can still be reduced. Therefore, this innovation is applicable to any form of rotation.

[0110] Macroscopically analyzed, in a rotating system, for all the moving mass points M with respect to the rotating body 8, as long as their centers of mass can move, the directions of their movements will be away from the real-time center of rotation O. Regardless of the shape of the moving curve S and whether it moves, that is, the radial direction becomes larger. As long as the tangential direction of the path for M to move away is provided to approach the ideal center of rotation O, then the phenomenon of approaching the ideal center of rotation will occur, thereby reducing vibration.

[0111] As Figure 6 In the above and below figures, the moving mass point M connected to the supporting spring 13 can move linearly within the track edge 5. With respect to S, the ideal center of rotation O is located on the straight line where the center line of the spring is. The physical diagram is Figure 14 The left figure, where the track edge 5 is fixed with respect to the rotating system and rotates with the rotating system.

[0112] Then, the above figure is when the rotating system is stationary and the supporting spring 13 is at its original length.

[0113] The elastic coefficient is k.

[0114] The following figure is when the rotating system rotates at an angular velocity w. The spring will be stretched and M will move to the right. After being stretched, M may come to rest again.

[0115] If its stretching length is d, the distance between the real-time center of rotation O and the origin of the spring, and the component on the center line of the spring is x, YZ is the elastic force received by M, and YV is the resultant force received by M at Y.

[0116] YZ = kd;

[0117] Ignoring friction, then YU is perpendicular to YZ. According to the vector analysis of forces,

[0118] YZ = YV cos(a)

[0119] From kinematics and force analysis, the position of the real-time center of rotation O

[0120] If M can remain stationary with respect to S, then M maintains uniform circular motion and YV maintains the centripetal force.

[0121] YV = mw²(d + x) / cos(a)

[0122] Based on the above three expressions, it can be obtained that:

[0123] d = mw²x / (k - mw²)

[0124] Among them, after the rotating system is determined, m, w, and k are all constants, that is, d is a linear function of x, which means that d moves to the right as x moves to the left.

[0125] a. If k > mw², d is a positive number, and M can reach a new static position again.

[0126] Meanwhile, O approaching P will cause d to decrease, which in turn causes x to decrease, so that M reaches the static point faster.

[0127] b. If k < mw², x < 0 occurs, and M will keep moving to the right and cannot reach a new static position until it encounters an obstacle.

[0128] c. When k = mw², to reach the static position relative to S, then

[0129] The required centripetal force YV = mw²(d + x) / cos(a) = k(d + x) / cos(a)

[0130] To maintain this centripetal force, the corresponding required

[0131] YZ = YV cos(a) = k(d + x) / cos(a) cos(a) = k(d + x)

[0132] And the elastic force that the spring can provide

[0133] YZ = kx

[0134] The two YZs need to be equal, that is, it is required that k(d + x) = kx

[0135] To make the two YVs equal, when d is not zero, x has no solution, that is, M will keep moving until it encounters an obstacle.

[0136] When d = 0, x can be any number, that is.

[0137] d = 0, that is, when the support spring 13 is at its original length, if the positions of the real-time rotation center O and the center of mass of M coincide, and x can be any length, then the center of mass of M can be at any position on the ray OM, and the elastic force of its spring is equal to the centripetal force. Relative to S, M can remain static, which is called the "permanent balance phenomenon". Among them, d = 0 does not require O to be on the center line of the spring.

[0138] Figure 6 The general situation where O is at any position is discussed. When O is on the straight line PY, it is a special case where a = 0 and cos(a) = 1, which also conforms to the analysis results.

[0139] As described above, regardless of the magnitudes of k and mw², when the support spring 13 is at its original length, the real-time center of rotation O is on one side of the centroid M of the mass; when the system rotates, M will have a component of movement in the direction of the ray OM. During the movement of M, the total centroid Q also moves accordingly, thereby driving the real-time center of rotation O to move along with it, moving in the direction of M. This is called the "centroid following phenomenon", and the intensity of the centroid following phenomenon is positively correlated with the mass of M and the radius of rotation of M.

[0140] The above analysis ignores factors such as friction. In the actual implementation process, considering friction and actual effects, the centroid following phenomenon can also occur.

[0141] As Figure 16 , if the two support springs 13 are connected in opposite directions and the total centroid Q does not coincide with the ideal center of rotation P, then the real-time center of rotation O will be between P and Q; when the rotating system rotates around O, both support springs 13 will exhibit the centroid following phenomenon, and the intensity of the centroid following phenomenon is positively correlated with the radius of rotation of M. Therefore, the final result is that O approaches the center of the origins of the two springs. This is called the "center approaching phenomenon".

[0142] Optionally, for a rotating system, the number of support springs 13 can be arbitrary, the performance of each support spring 13 can be arbitrary, the mass of each moving mass point M can be arbitrary, and the installation angle of the support springs 13 can be arbitrary, as long as the "center approaching phenomenon" can occur.

[0143] According to the center approaching phenomenon, if the ideal center of rotation P of the rotating system is at the center of the origins of these springs, then O moves towards P, thereby reducing the vibration of the rotating system. For example Figure 14 In the left figure, there are 3 support springs 13; as Figure 17 , there are 3 and 4 support springs 13.

[0144] Furthermore, design several directions such that the ideal center of rotation P coincides with all the origins of the springs, and for each support spring 13, k = mw² is maintained, as Figure 15 , then there is a permanent balance phenomenon in each direction. As long as P and O coincide, M can be in balance at any position, that is, as long as P and O deviate, M will exhibit the center approaching phenomenon, causing P and O to coincide in that direction. Finally, for the components in each direction, O and P coincide, and ultimately, O and P coincide. In this way, the rotating system can eliminate vibration.

[0145] Generally speaking, as Figure 18 , for this vibration elimination design, it only needs to satisfy that for each support spring 12, k = mw², and the component of d along the center line of the spring is zero, that is, the line connecting P and each origin of the spring is perpendicular to the center line of the spring, without the requirement that P is on the center line of the spring. Based on the results of the permanent balance phenomenon and the center approaching phenomenon, finally, vibration can be eliminated.

[0146] The generalized vibration-damping support springs 13, and the moving mass point M at its original length. Along with the position of the real-time center of rotation O, M can stretch the support spring 13 or move in the opposite direction to compress the support spring 13.

[0147] Furthermore, the number and direction of the above support springs 13 can be any number, and each support spring 13 does not need to be the same.

[0148] Generally, for the sake of convenient expression, friction is not considered above. In reality, with friction, the phenomenon of approaching the center may occur.

[0149] Optionally, in the figure, one end of the support spring 13 is installed at S, and the other end is connected to M. If both ends are connected to M and no end is stationary relative to S, the phenomenon of approaching the center can also occur.

[0150] Furthermore, the support spring 13 can be generalized to a spring plate, a rubber band, or a material that deforms under force. In this article, taking the satisfaction of Hooke's law as an example, for other materials that do not satisfy Hooke's law, the moving mass point M can also move in the opposite direction, and the phenomenon of approaching the center can also be satisfied, and the effect of reducing vibration can also be achieved.

[0151] Objects in specific implementation:

[0152] Moving mass point M: It can be any object with mass or a combination of objects. For example, Figure 13 in, M is a pendulum bob, Figure 7 in, M is a ball, a roller, or an annular structure. Figure 8 and Figure 9 in, M is a small car with wheels. In a rotating system, the number of moving mass points M on each moving curve S can be 0 or any natural number, and the shape and mass of each moving mass point M can also be different.

[0153] Moving curve S: The moving curve S is only a set of the movement ranges of the mass centers of the moving mass points M; the number of moving curves S in the rotating system can be any natural number; the shape of each moving curve S can be different; the curve is also a generalized curve, including special curves, such as straight lines, circles, conic curves, etc., as Figure 5 .

[0154] In reality, the moving curve S can be in any form, as long as it can restrict the movement range of the moving mass point M. It does not necessarily need to have a physical route, track, or channel. For example,

[0155] Figure 13 in, the moving curve S is a circle with the pendulum shaft 1 as the center for the moving mass point M, without an actual physical track.

[0156] Figure 7 in, the moving curve S is a sunken track or a strip-shaped track.

[0157] Figure 8 Among them, the active curve S is a circle with the center P. According to the analysis, such an orbit may completely eliminate vibration.

[0158] Generalize Figure 14 Among them, the installation position of each active curve S can be random, not limited to the same point, and the angle is not restricted either.

[0159] Generalize. During the rotation process, the active curve S may deform. In this way, the movement direction of the active particle M may be affected. However, as long as the resultant force received by the active particle M satisfies the phenomenon that the resultant force approaches the normal line, the function of reducing vibration can be achieved.

[0160] Furthermore Figure 13 Among them, the 3 pendulums perform circular motion around the pendulum shaft 1 as the center. If the pendulum shafts 1 of each pendulum coincide with the ideal rotation center P, in this way, the 3 active curves S are all circles with the ideal rotation center P as the center. In this way, according to the Figure 4 analysis of, vibration can be completely eliminated.

[0161] Furthermore: Figure 8 and Figure 9 Among them, M is a trolley. The body 4 of the trolley is connected to the small wheel 2 through the spring piece 3. When the spring piece 3 is not deformed, the body 4 is in pressure contact with the edge 5 of the track. When the trolley is pushed, static friction will be generated. When the active curve S starts to rotate with the rotating body, this static friction will help the trolley to accelerate and rotate along with the active curve S; when the angular velocity reaches a high speed, the centrifugal effect of the body 4 will bend the spring piece 3, the spring piece 3 deforms, and the body 4 leaves the edge 5 of the track; the trolley starts to move relative to the active curve S, thus generating the phenomenon of approaching the ideal rotation center. In this way, at the beginning of the system rotation, the trolley can obtain the tangential acceleration of the circle in time, and avoid the disordered movement of each M when the angular velocity is small at the beginning of the rotation and the phenomenon of approaching the ideal rotation center is not obvious, which will cause a greater eccentricity instead.

[0162] Furthermore, the spring piece 3 can be any deformable device, such as a spring, a rubber block, a rubber band, etc.

[0163] Furthermore Figure 9The method of using the centrifugal effect to compress the elastic device to break the original static friction shown can be in other forms. As long as when the rotating system is stationary, the moving particle M and the moving curve S maintain pressure contact and there is static friction; when the rotating system rotates to a certain angular velocity, the moving particle M and the moving curve S separate and the static friction disappears. That is, by using the centrifugal effect generated by the rotation of the object, to maintain the centripetal acceleration of the moving particle M, a centripetal force must be obtained from the outside. According to Newton's third law, the moving particle M will also give an external reaction force. Just use this force to break the static friction, and the implementation method can be arbitrary.

[0164] Figure 14 In it, S is not a rigid moving curve, but M is connected to S through the support spring 13. The spring is elastic and can change its length. As shown in the left figure, M moves within the straight track and can rotate with the rotating system at the same time. In the right figure, M is not restricted by the straight track. When the system rotates, it is not limited to linear motion relative to S. In the figure, each pendulum shaft 1 coincides at one point and also coincides with the ideal rotation center P.

[0165] Optionally, in actual implementation, each pendulum shaft 1 can not coincide with the ideal rotation center P, and each pendulum shaft 1 can also be independently installed at any position, and the support spring 13 can rotate around the pendulum shaft 1.

[0166] Optionally, there can be no pendulum shaft 1, and each moving curve S is fixedly installed relative to the rotating system with the support spring 13.

[0167] Optionally, the installation direction of each support spring 13 can be arbitrary, and the point P does not need to be on the straight line where the center line of the spring is located.

[0168] Optionally, the installation position of the support spring 13 can be at the end of M far from P, that is, M is between P and the support spring 13. When the system rotates, M compresses the support spring 13, as Figure 16 .

[0169] For the convenience of expression, this article describes it based on the rotating cross-section. In reality, the object is a three-dimensional structure, and the principle of each cross-section still applies. For a three-dimensional rotating body, vibration can be reduced separately at different rotating cross-sections, so as to achieve the overall vibration reduction of the rotating body. For example, as Figure 10 , vibration is reduced at 2 cross-sections respectively.

[0170] Optionally, the number of cross-sections for vibration reduction is not limited to 2, and the number can be a natural number.

[0171] Optionally, the moving curve S does not necessarily need the support of another physical object, and M can be directly installed on the rotating body 8.

[0172] Preferably, the rotating body can be connected to the support through an elastic material, which can further reduce the external transmission of vibration. For example Figure 12 As shown in Figure 12 , the trolley wheel spring 12 connects the movable support 10 and the fixed support 11. The movable support 10 may be affected by the vibration of the rotating shaft 6. This vibration is buffered by the trolley wheel spring 12 and weakened when transmitted to the fixed support 11. Thus, the vibration transmitted externally by the fixed support 11 is buffered and weakened by the trolley wheel spring 12.

[0173] Furthermore, the trolley wheel spring 12 can be any elastic device or damping device, such as rubber, rubber band, spring sheet, damping rod, etc.

[0174] Optionally, for the movement of M, a damping device can be added so that when the rotating system starts to rotate, M can rotate in time and will not move disorderly. For example Figure 9 add damping to the trolley wheels Figure 7 add damping to each M on its track Figure 13 add damping at the pivot of the pendulum. All damping should not affect the final position of the moving mass point.

[0175] Generally speaking, the type and shape of the moving curve S are not limited. For all physical objects of the moving curve S and the moving mass point M, there may be physical objects of the moving curve S where, at some points, the physical object of the moving mass point M cannot be fully positioned. For example Figure 7 in the left figure, if the hollow track is wider than the diameter of the moving ball, and in the right figure, if the inner diameter of M is larger than the cross-sectional diameter of S, as Figure 11 in the left figure a, at a certain point of M on S, its movable direction is multi-directional, resulting in S not being a curve but possibly a curved surface or a three-dimensional shape; as Figure 11 in the right figure b, if the track edge 5 is made of non-rigid material, it will deform under the action of the centrifugal effect of M, resulting in a change in the shape of the moving curve S; as Figure 7 in the right figure, if the strip-shaped track is made of non-rigid material, it can be deformed. In summary, for the moving mass point M of this innovation, the type and shape of the moving curve S and whether it can be deformed are not limited. The feature of this innovation is that the moving mass point M can exhibit all the design mechanisms and implementation measures of the above-mentioned phenomena of moving away from the real-time center of rotation, approaching the normal line, and approaching the ideal center of rotation.

[0176] Optionally, all the above spring-like devices can be extended to all elastic devices, such as spring sheets, rubber, rubber bands, etc., or damping devices and deformable devices.

[0177] This shock absorption method can be applied to all rotating components such as washing machines, various drying machines, gasoline engines, diesel engines, rocket engines, steam turbines, gas turbines, centrifugal compressors, electric motors, generators, water pumps, water turbines, ventilators, electric vehicles, trains, high-speed rails, ships, etc.

Claims

1. A method for reducing vibration of a rotating object, characterized in that: It includes rotating bodies, moving particles and moving curves; the rotating body is a rotating object whose vibration needs to be reduced; The active particle is an object with mass. Relative to the active curve, the center of mass of the active particle can move on the active curve. The activity curve is the set of all points that the center of mass of the active particle can reach relative to the rotating body; The activity curve rotates with the rotating body; when the rotating body rotates, all the active particles and the activity curve rotate with the rotating body; the system composed of the rotating body, all the active particles, the activity curve and all the objects involved in the rotation is called the "rotation system"; the overall center of mass of the rotating system is called the "total center of mass"; when the rotating system rotates, the real-time center of rotation is called the "real-time center of rotation"; when the rotating body rotates, the point whose position remains unchanged relative to its support is called the "ideal center of rotation"; there is a point on the activity curve, through which the activity curve has its normal; When the rotating system rotates, if the real-time rotation center and the ideal rotation center do not coincide, the ray passing through the ideal rotation center with the real-time rotation center as the endpoint has an intersection with the normal line (except the real-time rotation center), and the active particle at this point can move; As a result of the movement, the real-time rotation center is brought closer to the ideal rotation center, thereby reducing vibration.

2. The method according to claim 1, characterized in that: The activity curve is a circle with the ideal rotation center as the center; the activity center of mass moves on the activity curve, which can completely eliminate the vibration caused by the rotation.

3. The method according to claim 1, characterized in that: When the rotating system is stationary, the movable mass point has a positive pressure relative to the active curve, so that static friction can be generated between them. When the rotating system starts to rotate, the static friction can provide the angular acceleration of the circular motion required by the movable mass point, so that the movable mass point can rotate synchronously with the rotating system. When the angular velocity of the rotating system reaches or exceeds a certain value, the centrifugal effect of the moving particle causes the positive pressure between the moving particle and the moving curve to disappear, thereby the static friction disappears, and the moving particle can move relative to the moving curve.

4. A method for reducing vibration of a rotating object, characterized in that: It includes a rotating body, a movable mass point and a spring; the rotating body is a rotating object whose vibration needs to be reduced; the movable mass point is an object with mass, which is installed on the spring. When the spring is at its original length, the point where the center of mass of the movable mass point M is located is called the "spring origin"; the spring is installed on the rotating body, rotates with the rotating body, and connects the movable mass point; when the rotating body rotates, all the movable mass points and the spring rotate with the rotating body; the system composed of the rotating body, all the movable mass points, all the springs and all the objects involved in the rotation is called the "rotation system"; the overall center of mass of the rotating system is called the "total center of mass"; the rotating system When the system rotates, the real-time center of rotation is called the "real-time center of rotation"; when the rotating body rotates, the point whose position remains unchanged relative to its bracket is called the "ideal center of rotation"; when the rotating system rotates, if the real-time center of rotation and the spring origin do not coincide, the active mass point will move relative to the rotating system, and this movement has a component in the direction of the ray from the real-time center of rotation to the spring origin, so that the total center of mass moves in the direction of the ray from the real-time center of rotation to the spring origin, and thus the real-time center of rotation also moves in the same direction; when multiple springs are installed in the rotating system, the real-time center of rotation can approach the center position of each spring origin; If the ideal rotation center is located at this center position, when the rotating system rotates, the movement of each active particle can cause the real-time rotation center to approach the ideal rotation center, thereby reducing vibration.

5. The method according to claim 4, characterized in that: The mass of each active particle is called m; the elastic coefficient of each spring is called k; the straight line formed by the centers of the spring circles is called the "spring center line"; the angular velocity of the rotating system is called w; when each spring and its corresponding active particle, its k=mw²; for all springs, the perpendicular lines of the spring center lines at the spring origin intersect at the ideal center of rotation; then, when the rotating system rotates at an angular velocity w, each particle will move, and the result of the movement can make the real-time center of rotation coincide with the ideal center of rotation, thereby eliminating the vibration of the rotating system.

6. The method according to claim 1 is applied to washing machines, various spin dryers, gasoline engines, diesel engines, rocket engines, steam turbines, gas turbines, centrifugal compressors, motors, generators, water pumps, turbines, ventilators, electric vehicles, trains, high-speed trains, and ships.

7. The method according to claim 2 is applied to washing machines, various spin dryers, gasoline engines, diesel engines, rocket engines, steam turbines, gas turbines, centrifugal compressors, motors, generators, water pumps, turbines, ventilators, electric vehicles, trains, high-speed trains, and ships.

8. The method according to claim 3 is applied to washing machines, various spin dryers, gasoline engines, diesel engines, rocket engines, steam turbines, gas turbines, centrifugal compressors, motors, generators, water pumps, turbines, ventilators, electric vehicles, trains, high-speed trains, and ships.

9. The method according to claim 4 is applied to washing machines, various spin dryers, gasoline engines, diesel engines, rocket engines, steam turbines, gas turbines, centrifugal compressors, motors, generators, water pumps, turbines, ventilators, electric vehicles, trains, high-speed trains, and ships.

10. The method according to claim 5 is applied to washing machines, various spin dryers, gasoline engines, diesel engines, rocket engines, steam turbines, gas turbines, centrifugal compressors, motors, generators, water pumps, turbines, ventilators, electric vehicles, trains, high-speed trains, and ships.

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