A propeller shaft excitation-response separation system and method using on-site dynamic balance of hull shaft frequency vibration velocity peak value
An on-site dynamic balance and excitation response technology, which is applied in vibration testing, machine/structural component testing, measuring devices, etc., can solve the problems that dynamic balancing tests cannot achieve good results, and achieve low test environment requirements, high efficiency, and The effect of flexibility
Active Publication Date: 2019-01-15
HARBIN ENG UNIV
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Problems solved by technology
Since the detected vibration signal is inaccurate, the dynamic balance test will naturally not achieve good results.
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[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0026] The dynamic balance test adopts the influence coefficient method. The specific test plan is as follows:
[0027] 1. Design and process multiple split balance discs according to the test requirements and site environment, and install them in appropriate positions so that the 0 degrees of all discs are on the same horizontal line;
[0028] 2. Vibration sensors are arranged at multiple points on the inner surface of the hull, and the number of measuring points is more than 1 / 2 more than the number of balance plates. Paste a piece of reflective paper axially on the appropriate position of the shaft system, and be on the same horizontal line as 0° of the balance disc. Install a photoelectric sensor near the reflective paper in the radial direction of the shaft system. The distance between the sensor and the reflective paper depend...
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The invention provides a propeller shaft excitation response separation system and a method by using hull shaft frequency vibration speed peak value field balancing. A divided balance disc is arranged at a proper position on the shafting as a counterweight surface, a field balancing test is used for balancing unbalanced excitation of the propulsion shafting, and a propeller excitation response is thus obtained. In view of cantilever-type propulsion shafting on the flexible basis of a ship, particularly a submarine, a vibration sensor is placed on the inner side surface of the hull, the point with the maximum multi-point normal axis frequency vibration speed peak value on the surface of the hull is used as a vibration measuring point, multi-surface and multi-times balancing tests are carried out, the balancing effects are more ideal, the inertia of the shafting is also changed, and the vibration features of the shafting can be improved. The system and the method of the invention can be carried out in a cabin, the propeller in the water does not need to be changed, the efficiency is high, the flexibility is high, the test environment is lowly required, and the test cost and the time cost are saved.
Description
technical field [0001] The invention relates to a propeller shaft excitation response separation system and method utilizing on-site dynamic balance of the shaft frequency vibration velocity peak value of the hull. Background technique [0002] Mechanical noise and propeller noise are the main noise sources of ships, especially submarines, when they sail quietly, and the hydrodynamic noise is very small at this time. One of the main excitation sources of mechanical noise is shaft unbalance excitation. The propulsion shafting of the submarine, because the shafting is slender, the propeller is heavy to form a cantilever structure, the geometric center and the center of mass do not coincide, and there are many connecting parts and additional inertia, the phenomenon of rotor imbalance is very easy to occur. Propeller noise mainly includes cavitation noise and blade noise. The source is that when the propeller is in working condition, the upper surface of the blade tip is impac...
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IPC IPC(8): G01M7/02
CPCG01M7/02
Inventor 李玩幽田震喻家鹏吴江飞李宗全刘帅王东华郭宜斌率志君卢熙群
Owner HARBIN ENG UNIV