Vibration control of free piston machines through frequency adjustment
a free piston machine and frequency adjustment technology, applied in the direction of piston pumps, pump parameters, domestic cooling apparatus, etc., can solve the problems of unconfined by conventional crankshafts and connecting rods, reciprocating machines cause substantial vibration, and vibration is ordinarily undesirable, so as to reduce or minimize the amplitude of mechanical vibration of mechanical apparatus
a free piston machine and frequency adjustment technology, applied in the direction of piston pumps, pump parameters, domestic cooling apparatus, etc., can solve the problems of unconfined by conventional crankshafts and connecting rods, reciprocating machines cause substantial vibration, and vibration is ordinarily undesirable, so as to reduce or minimize the amplitude of mechanical vibration of mechanical apparatus
US20070256428A1Inactive Publication Date: 2007-11-08SUNPOWER
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[0027] The invention makes use of the observation that, for a mechanical apparatus that includes a vibrating or reciprocating main machine coupled to a secondary vibrating system, which can include a vibration balancer, there are three frequencies that are important. There are the resonant (or natural) frequency of the vibrating main machine, the resonant (or natural) frequency of the secondary vibrating system and the operating frequency of the main machine. The operating frequency of the main machine is also the operating frequency of the vibration balancer and any other secondary vibrating system coupled to the main machine.
[0028] If a graph is made of frequency vs. amplitude of vibration for any resonant system, the plotted amplitudes form a resonant peak centered at a resonant frequency. These peaks can rise and fall in a range extending from a broad, gradual manner, to a sharp, steep manner. The sharper the peak, the higher the quality factor “Q” of the resonant system, as kn...
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A method and apparatus for minimizing the amplitude of mechanical vibrations of a mechanical apparatus including a linear, freely reciprocating, prime mover coupled to and driving a reciprocating mass of a driven machine in reciprocation at a driving frequency. The coupled prime mover and driven machine have a spring applying a force upon the reciprocating mass to form a resonant main system having a main system resonant frequency of reciprocation. A driving frequency range over which the driven machine operates at an acceptable efficiency of operation is determined and stored. A parameter of the operation of the mechanical apparatus, such as the amplitude of vibrations or an operating temperature, is sensed and the prime mover is driven in response to the sensed parameter at a driving frequency that is offset from the main system resonant frequency of reciprocation, is within the driving frequency range of acceptable efficiency of operation and reduces or minimizes the amplitude of mechanical vibration of the mechanical apparatus under existing operating conditions.
Description
BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] This invention relates generally to minimizing mechanical vibrations of a mechanical apparatus that includes one or more masses driven in reciprocation by a linear, freely reciprocating, prime mover and using the electronic controller that controls that prime mover. [0003] 2. Description of The Related Art [0004] Linear, freely reciprocating machines are often used because they provide improved durability, reduced wear, controllability and efficiency. Freely reciprocating machines include linear compressors, free piston Stirling engines, Stirling cooler, cryocoolers and heat pumps, linear motors and linear alternators. Linear, freely reciprocating machines reciprocate with a controllable stroke and are unconfined by conventional crankshafts and connecting rods. However, linear, freely reciprocating machines cause substantial vibration because they have one or more masses that are linearly reciprocating within a comm...
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Patent Timeline
08 Nov 2007
Publication
US20070256428A1
- IPC
- F25B9/00; F25D19/00; H02P25/06; H02P25/064
- CPC
- F04B35/045; F04B2201/0806; F04B2203/0404; F16F15/02; H02P25/027; F25B2309/001; H02K11/0015; H02K11/0073
- Inventors
- UNGER, REUVEN Z-M; KEITER, DOUGLAS E.