The reason is that the balanced swivel body needs to be reassembled. In all these cases, on-site dynamic balance is required. Field dynamic balancing may include one-sided static balancing and dynamic balancing of a flexible body of revolution.
The method of static balancing is very simple. Firstly, at the additional support of the revolving body (preferably the shortest distance from the correcting surface) and in the direction with large vibration (usually horizontal), the sensor is installed and a vibration meter is connected. Start the revolving body and record the vibration response from the revolving body to the working speed. The high reading is X, which corresponds to the measured unbalanced quantity U. There is the relation U=kx. For a rigid revolving body, at a fixed speed, Whether it is a hard support or a soft support, K must be a constant, so there must also be a vector relation U=kx. To obtain the angle (or phase) of the vector x, the two-turn method can be used to calculate the measurement. That is, at any position with R(mm) radius of the revolving body, place a check mass M(g) and start the revolving body to the same speed. Record the vibration response at this time with a high reading of x1. Obviously, X1 is generated by the combined action of original unbalance U and check unbalance U1=MR, i.e. kx1=U+Ut. Turn the check mass M(g) 180_and start the revolving body again at the same speed after resetting. Record the vibration response at this time with a high reading of X2. There should be kx2=U-Ut, so the vector equation can be easily solved by using the graphical method.
For the rotating body which needs double-sided balancing, field dynamic balancing testing instrument capable of measuring phase should be used. Therefore, it is necessary to set its quasi-signal generator on the rotating body, which is usually optoelectronic, or uses synchronous flashlight triggered by vibration signal at the support. Due to visual pause of the human eye, the observed rotating body will be learned to be in a stationary state. In the case of synchronized internal light, the angle between the set angle mark of 0 degrees and a fixed position (e.g. in the horizontal direction) can be observed by pre-setting an angle mark of 0 degrees, 90 degrees, 180 degrees etc. on the correction surface.
With its quasi-signal, the complex amplitude XL and XR of the vibration response at the support can be determined, and the imbalance can be calculated by the coefficient influence method. In order to simplify the dynamic stiffness matrix further, the stiffness matrix or mass matrix of the system is usually unknown, and the stiffness or anisotropy of the support is not easily determined. At this time, the dynamic flexibility matrix of the system can be obtained by experimental method, and then the stiffness matrix can be obtained by inversion matrix. This method, called the influence coefficient method, is also widely used in the multi-correcting surface balance of flexible revolving body.
The influence coefficient method is easy to calculate by complex number. Its coefficient matrix elements are also complex, so the influence of anion can be considered, instead of minimizing the anion of soft-supported or hard-supported dynamic balancing machines, and omitting it when separating solutions. The influence coefficient matrix elements are numerical values. When testing, they should all be carried out at a fixed speed. When the speed changes, the influence coefficient matrix values will also change.
Foshan Huake Zhichuang Intelligent Equipment Co., Ltd. is an integrated enterprise focusing on R&D, production and sales of fully automatic and semi-automatic balancing machines. It specializes in R&D of intelligent and differentiated products. It has the strength of software development and mechanical design, promotes the development of the balancing machine industry and aspires to be a leading enterprise in the balancing machine industry.
The method of static balancing is very simple. Firstly, at the additional support of the revolving body (preferably the shortest distance from the correcting surface) and in the direction with large vibration (usually horizontal), the sensor is installed and a vibration meter is connected. Start the revolving body and record the vibration response from the revolving body to the working speed. The high reading is X, which corresponds to the measured unbalanced quantity U. There is the relation U=kx. For a rigid revolving body, at a fixed speed, Whether it is a hard support or a soft support, K must be a constant, so there must also be a vector relation U=kx. To obtain the angle (or phase) of the vector x, the two-turn method can be used to calculate the measurement. That is, at any position with R(mm) radius of the revolving body, place a check mass M(g) and start the revolving body to the same speed. Record the vibration response at this time with a high reading of x1. Obviously, X1 is generated by the combined action of original unbalance U and check unbalance U1=MR, i.e. kx1=U+Ut. Turn the check mass M(g) 180_and start the revolving body again at the same speed after resetting. Record the vibration response at this time with a high reading of X2. There should be kx2=U-Ut, so the vector equation can be easily solved by using the graphical method.
For the rotating body which needs double-sided balancing, field dynamic balancing testing instrument capable of measuring phase should be used. Therefore, it is necessary to set its quasi-signal generator on the rotating body, which is usually optoelectronic, or uses synchronous flashlight triggered by vibration signal at the support. Due to visual pause of the human eye, the observed rotating body will be learned to be in a stationary state. In the case of synchronized internal light, the angle between the set angle mark of 0 degrees and a fixed position (e.g. in the horizontal direction) can be observed by pre-setting an angle mark of 0 degrees, 90 degrees, 180 degrees etc. on the correction surface.
With its quasi-signal, the complex amplitude XL and XR of the vibration response at the support can be determined, and the imbalance can be calculated by the coefficient influence method. In order to simplify the dynamic stiffness matrix further, the stiffness matrix or mass matrix of the system is usually unknown, and the stiffness or anisotropy of the support is not easily determined. At this time, the dynamic flexibility matrix of the system can be obtained by experimental method, and then the stiffness matrix can be obtained by inversion matrix. This method, called the influence coefficient method, is also widely used in the multi-correcting surface balance of flexible revolving body.
The influence coefficient method is easy to calculate by complex number. Its coefficient matrix elements are also complex, so the influence of anion can be considered, instead of minimizing the anion of soft-supported or hard-supported dynamic balancing machines, and omitting it when separating solutions. The influence coefficient matrix elements are numerical values. When testing, they should all be carried out at a fixed speed. When the speed changes, the influence coefficient matrix values will also change.
Foshan Huake Zhichuang Intelligent Equipment Co., Ltd. is an integrated enterprise focusing on R&D, production and sales of fully automatic and semi-automatic balancing machines. It specializes in R&D of intelligent and differentiated products. It has the strength of software development and mechanical design, promotes the development of the balancing machine industry and aspires to be a leading enterprise in the balancing machine industry.
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