A longitudinal vibration control device for ship propulsion shafting
A technology for propulsion shafts and boats, which is applied in the field of longitudinal vibration control devices for propulsion shafting of ships, can solve the problems of increasing the damping of the propulsion shafting, the control effect is not ideal, the control effect is poor, etc., and achieves fast dynamic response and rapid response. , the effect of prolonging the service life
Inactive Publication Date: 2018-03-27
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
[0004] In order to reduce the vibration of the propulsion shafting, there are various shock absorbing devices, such as dampers, resonance converters, etc., which are all passive control technologies. The purpose is to increase the damping of the propulsion shafting and reduce the energy consumption Scattered, but practice shows that its control effect is not ideal
Devices based on active control technology include electromagnetic actuators, pneumatic servo actuators, etc. Compared with passive control, they have the advantages of good adaptability and low-frequency control effect. The control effect obtained in the frequency range is poor
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[0035] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.
[0036] figure 1 It is a structural schematic diagram of an embodiment of the present invention. It can be seen from the figure that it includes: accelerometer, data acquisition card A / D, processor, data acquisition card D / A, power amplifier and piezoelectric actuator 4 . The vibration signal of the thrust bearing base measured by the accelerometer is collected by the data acquisition card and ...
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The invention discloses a ship and boat propulsion shafting longitudinal vibration control device, including a speed acceleration meter, a data gathering card A / D, a processor, a data gathering card D / A, a power amplifier and a piezoelectric actuator. The device utilizes a vibration signal on a push force shaft bearing base seat as a feedback control signal, and combines the piezoelectric actuator installed on a push shaft axis, applies an axial direction control force to the push shaft axis, to reduce the vertical vibrations of the push shaft axis, thereby to reduce the vibrations of a ship body. The device adopts the piezoelectric actuator, can effectively control the middle and high frequency vibrations of the push shaft axis; adopts a flexible hinge chain displacement enlargement mechanism to effectively enlarge the output displacement of one of the piezoelectric stacks, and the coefficients of the displacement enlargement can be adjusted; adopts another piezoelectric stack, to adjust the axial direction steel rigidity of the piezoelectric actuator, in order to reduce the displacement loss of the first piezoelectric stack; and adopts a flexible ball hinge, a pretightening spring and a pretightening screw nail to function as a protection for the piezoelectric stacks, in order to prolong the service life of the piezoelectric stacks.
Description
technical field [0001] The invention belongs to the field of active control of ship vibration and noise, in particular to a longitudinal vibration control device of a ship propulsion shaft system based on piezoelectric micro-displacement amplification and adjustable stiffness. Background technique [0002] At present, with the development of technology, ships and submarines are still one of the important means of maritime transportation and control of marine resources. However, whether it is a civil ship or a military submarine, the rotation of the propeller in the water will generate an unsteady axial excitation force, which constitutes the main excitation source of the longitudinal vibration of the main propulsion shafting. The longitudinal vibration of the main propulsion shafting will not only cause the failure of the hull structure, but also cause the hull vibration and radiate noise underwater, which will reduce the comfort of civilian ships and the stealth performance...
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IPC IPC(8): B63H1/12
CPCB63H1/12
Inventor李颖张小明丁汉许文杰
OwnerHUAZHONG UNIV OF SCI & TECH