The purpose of mechanical rotor dynamic balance correction
When the mechanical rotor is in operation, the unbalanced inertial force generated by the components will cause additional dynamic pressure in the motion pair; This will not only increase friction in the motion amplitude and internal stress in the components, but also reduce mechanical efficiency and service life; Moreover, as the magnitude and direction of these inertial forces generally vary periodically, they will inevitably cause forced vibrations in the machinery and its foundation. If its amplitude is large or its frequency is close to the mechanical resonance frequency, it will cause extremely adverse consequences. Not only will it affect the normal operation and service life of the machinery itself, but it will also cause damage or even destruction to nearby factory machinery and buildings.
1. The purpose of mechanical rotor dynamic balance correction: During the operation of the machine, the unbalanced inertial force generated by the components will cause additional dynamic pressure in the motion pair. This not only increases the friction in the motion amplitude and internal stress in the components, reducing mechanical efficiency and service life, but also inevitably causes forced vibration in the machinery and its foundation due to the periodic changes in the magnitude and direction of these inertial forces. If its amplitude is large or its frequency is close to the mechanical resonance frequency, it will cause extremely adverse consequences. Not only will it affect the normal operation and service life of the machinery itself, but it will also cause damage or even destruction to nearby factory machinery and buildings.
The purpose of mechanical rotor dynamic balance correction is to balance the unbalanced inertial forces of components to eliminate or reduce the adverse effects of inertial forces. However, it should be pointed out that some machines work by utilizing the vibration caused by the unbalanced inertial force generated by their components, such as compactors, massage machines, vibratory pile drivers, vibratory conveyors, etc.
2. The content of mechanical rotor dynamic balancing: In machinery, due to the different structures and motion forms of each component, the inertial forces generated and the methods of balancing are also different. Based on this, mechanical balance problems can be divided into the following two categories.
3. Inertial force balance of components rotating around a fixed axis:
(1) Balance of rigid rotor: In general machinery, the rigidity of the rotor is relatively good, the resonance speed is high, and the working speed of the rotor is lower than (0.6-0.75) (which is the first resonance speed of the rotor). At this point, the elastic deformation generated by the rotor is very small. This type of rotor is called a rigid rotor. If only its inertial force balance is required, it is called the static balance of the rotor; If a balance between inertia force and inertia moment is required simultaneously, it is called dynamic balancing of the rotor.
(2) Balance of wound rotor: Some mechanical systems, such as turbine engines, balance rotors with working speeds greater than the first critical speed, which have large masses and spans but small radial dimensions. Therefore, its resonance speed is low. If the working speed is greater than (0.6~0.75), the rotor will undergo significant deformation during operation, resulting in a significant increase in inertial force. This type of rotor is called a wound rotor.
3. Balance of mechanism: generally refers to the balance of mechanisms with reciprocating or planar composite motion components. Inertial forces and moments cannot eliminate all inertial forces and moments on the components inside the components, but can be combined into a total inertial force and moment that passes through the center of mass of the mechanism and acts on the frame.
When the mechanical rotor is in operation, the unbalanced inertial force generated by the components will cause additional dynamic pressure in the motion pair; This will not only increase friction in the motion amplitude and internal stress in the components, but also reduce mechanical efficiency and service life; Moreover, as the magnitude and direction of these inertial forces generally vary periodically, they will inevitably cause forced vibrations in the machinery and its foundation. If its amplitude is large or its frequency is close to the mechanical resonance frequency, it will cause extremely adverse consequences. Not only will it affect the normal operation and service life of the machinery itself, but it will also cause damage or even destruction to nearby factory machinery and buildings.
1. The purpose of mechanical rotor dynamic balance correction: During the operation of the machine, the unbalanced inertial force generated by the components will cause additional dynamic pressure in the motion pair. This not only increases the friction in the motion amplitude and internal stress in the components, reducing mechanical efficiency and service life, but also inevitably causes forced vibration in the machinery and its foundation due to the periodic changes in the magnitude and direction of these inertial forces. If its amplitude is large or its frequency is close to the mechanical resonance frequency, it will cause extremely adverse consequences. Not only will it affect the normal operation and service life of the machinery itself, but it will also cause damage or even destruction to nearby factory machinery and buildings.
The purpose of mechanical rotor dynamic balance correction is to balance the unbalanced inertial forces of components to eliminate or reduce the adverse effects of inertial forces. However, it should be pointed out that some machines work by utilizing the vibration caused by the unbalanced inertial force generated by their components, such as compactors, massage machines, vibratory pile drivers, vibratory conveyors, etc.
2. The content of mechanical rotor dynamic balancing: In machinery, due to the different structures and motion forms of each component, the inertial forces generated and the methods of balancing are also different. Based on this, mechanical balance problems can be divided into the following two categories.
3. Inertial force balance of components rotating around a fixed axis:
(1) Balance of rigid rotor: In general machinery, the rigidity of the rotor is relatively good, the resonance speed is high, and the working speed of the rotor is lower than (0.6-0.75) (which is the first resonance speed of the rotor). At this point, the elastic deformation generated by the rotor is very small. This type of rotor is called a rigid rotor. If only its inertial force balance is required, it is called the static balance of the rotor; If a balance between inertia force and inertia moment is required simultaneously, it is called dynamic balancing of the rotor.
(2) Balance of wound rotor: Some mechanical systems, such as turbine engines, balance rotors with working speeds greater than the first critical speed, which have large masses and spans but small radial dimensions. Therefore, its resonance speed is low. If the working speed is greater than (0.6~0.75), the rotor will undergo significant deformation during operation, resulting in a significant increase in inertial force. This type of rotor is called a wound rotor.
3. Balance of mechanism: generally refers to the balance of mechanisms with reciprocating or planar composite motion components. Inertial forces and moments cannot eliminate all inertial forces and moments on the components inside the components, but can be combined into a total inertial force and moment that passes through the center of mass of the mechanism and acts on the frame.
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