Measurement method for modal damping coefficient of rotary machine
A technology of damping coefficient and rotating machinery, which is applied in the testing of mechanical components, testing of machine/structural components, and measuring devices. It can solve problems such as poor safety and failure, reduce measurement costs, and improve measurement safety and versatility. Effect
Inactive Publication Date: 2013-07-24
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology
[0005] In order to solve the problem of poor security or even failure of the traditional half-power measurement method when measuring the damping of the rotor system, this invention proposes a measurement method for the modal damping coefficient of the rotating machine, which satisfies the theoretical research on the dynamic characteristics of the rotating machine and the new test-free Requirements of gravity balance technology for system damping parameters
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[0029] Describe the present invention below in conjunction with specific embodiment:
[0030] The method for measuring the modal damping coefficient of a rotating machine in this embodiment adopts the following steps:
[0031] Step 1: Measure the phase change curve of rotating machinery with speed:
[0032] Step 1.1: Refer to attached figure 2 , Install two vibration test sensors perpendicular to each other at the position to be tested in the rotor system of the rotating machine, and the sensor is aligned with the axis of the rotor system to measure the vibration amplitude of the rotor system. Minimize the additional error caused by the excessive sway of the shaft during rotation. Install the photoelectric sensor to align with the disc of the rotor system with the reflective sheet attached to it to measure the rotational speed of the rotor system; the position of the reflective sheet here is used as the initial reference position of the phase angle during measurement.
[0...
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The invention discloses a measurement method for a modal damping coefficient of a rotary machine. The method comprises the steps that firstly measuring a curve of the rotary machine with phase varying along of rotating speed and secondly carrying out value calculation on a matching test curve to obtain the corresponding modal damping coefficient of the rotary machine when a target function is a minimal value. In the measurement method for the modal damping coefficient of the rotary machine, the modal damping coefficient of the rotary machine is obtained by calculating the curve with the phase varying along with the rotating speed and through value calculation of the matching test curve, due to the fact the curve with the phase varying along with rotating speed is an approximate center symmetrical diagram and is in one-to-one correspondence with the modal damping coefficient, the method is utilized to measure the modal damping coefficient, a rotor system is not needed to be operated over a critical rotating speed, so that measurement cost is reduced, and measurement safety and generality are improved.
Description
technical field [0001] The invention relates to mechanical testing technology, in particular to a method for measuring the modal damping coefficient of a rotating machine. Background technique [0002] With the rapid development of modern industry, the rotor system is developing towards high speed and high power, and its performance is constantly improving. At the same time, people have higher and higher safety requirements for the rotor-support system. Therefore, scientific research workers have more in-depth research on the dynamic characteristics of the rotor system. Among them, one of the main research methods is to numerically simulate the dynamic characteristics of the real rotor system. During the numerical simulation, it is necessary to know the parameters of the rotor system, and the modal damping coefficient is one of the parameters that must be controlled. At the same time, the modal damping coefficient of the rotor system is also a parameter that must be measure...
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IPC IPC(8): G01M13/00
Inventor 郑龙席刘钢旗李晓丰
Owner NORTHWESTERN POLYTECHNICAL UNIV