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Ship propulsion shafting longitudinal vibration control device based on piezoelectric stack-hydraulic micro-displacement amplifier

A technology of piezoelectric stacking and displacement control, which is applied to the transmission device of synchronous propulsion components, propulsion device engine, ship propulsion, etc. It can solve the problems of unsatisfactory displacement control effect and complex structure of non-contact electromagnetic force actuator , to achieve significant vibration reduction effect, compact structure, and smooth movement

Inactive Publication Date: 2015-05-06
ZHEJIANG UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The disadvantage of this device is that the structure of the non-contact electromagnetic force actuator is complex, and the effect of displacement control is not ideal.

Method used

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  • Ship propulsion shafting longitudinal vibration control device based on piezoelectric stack-hydraulic micro-displacement amplifier
  • Ship propulsion shafting longitudinal vibration control device based on piezoelectric stack-hydraulic micro-displacement amplifier
  • Ship propulsion shafting longitudinal vibration control device based on piezoelectric stack-hydraulic micro-displacement amplifier

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Embodiment Construction

[0044] Such as figure 1 As shown, this embodiment is a piezoelectric stack-hydraulic micro-displacement amplification-based longitudinal vibration control device for propulsion shafting of a ship, including an acceleration sensor 6 , a thrust pulse controller 7 , a power amplifier 8 and a displacement control actuator 9 .

[0045] Depend on figure 2 It can be seen that, in this embodiment, the displacement control actuator 9 includes a piezoelectric stack 91 and a hydraulic micro-displacement amplifier 92 . Among them, the piezoelectric stack 91 is composed of a plurality of piezoelectric ceramics that are mechanically connected in series and electrically connected in parallel. The working voltage of each piezoelectric ceramic is the same, and the output displacement of the piezoelectric stack 91 is the output displacement of all the piezoelectric ceramics. The sum of the quantities, the output displacement of the piezoelectric stack 91 is calculated by the following formula...

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Abstract

The invention discloses a ship propulsion shafting longitudinal vibration control device based on piezoelectric stack-hydraulic micro-displacement amplifier. The device comprises an axial vibration measuring system, a thrust ripple controller, a power amplifier and a displacement control actuating mechanism which are sequentially in signal connection with one another; the displacement control actuating mechanism comprises a piezoelectric stack and a hydraulic micro-displacement amplifier; the piezoelectric stack is used for receiving an electrical signal sent by the power amplifier and generating a corresponding output displacement; the hydraulic micro-displacement amplifier comprises a hydraulic amplification cavity with openings in two ends; two ends of the hydraulic amplification cavity are respectively in seal fit with a large piston and a small piston; the large piston interacts with the displacement output end of the piezoelectric stack; the small piston interacts with a thrust bearing of a ship propulsion shafting system by virtue of a sliding valve core. The piezoelectric stack is rapid in dynamic response and capable of representing the magnitude of longitudinal vibration which is generated on the ship propulsion shafting system in real time; the output displacement of the piezoelectric stack is amplified by the hydraulic micro-displacement amplifier and acts on the thrust bearing, and a reverse axial control force is generated, so that displacement compensation is realized.

Description

technical field [0001] The invention belongs to the technical field of boat vibration and acoustic stealth, and in particular relates to a longitudinal vibration control device of a boat propulsion shaft system based on piezoelectric stack-hydraulic micro-displacement amplification. Background technique [0002] With the development of the shipbuilding industry, the main dimensions and load capacity of the ship are getting larger and larger, and the power of the main engine of the ship is also increasing. However, various constraints determine that the diameter of the propeller cannot be infinitely increased like the main dimension of the ship, and the ship The profile and hydrodynamic performance also determine that the number of propellers cannot be increased arbitrarily. As a result, the load on the propeller blades continues to increase, and the irregular vibration of the propeller becomes more and more obvious. It is most obvious in large and medium-sized ships, and eve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B63H21/30G01L5/22B63H23/34
Inventor 罗银淼方翔邸德宁
Owner ZHEJIANG UNIV
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