For traditional linear Stirling Cryocoolers, the amplitude of output sinusoidal AC voltage is modulated mainly by Modulation ratio (M) controlled by the inverter, so that the compression piston is driven to perform linear reciprocating motion and the compressed refrigerant expands rapidly in the expander to achieve the purpose of refrigeration. In practice, however, when M is used to modulate the amplitude of sinusoidal AC voltage, the input power and current will increase to a certain extent with the decreased M. To address the aforementioned concern, the correlated characteristics of output voltage of the inverter under the M and vector phase shift modes will be compared and analyzed in this paper for the selection of best driving mode for linear Stirling cryocoolers. Although the experiments reveal a small difference of sinusoidal voltage amplitude of the two modes under the same input voltage, and a basically same energy distribution of waveform at the fundamental frequency and other frequency multiplications, the required power and current are more stable and do not increase with the decreased output voltage amplitude in the mode of vector phase shift.
For traditional linear Stirling Cryocoolers, the amplitude of output sinusoidal AC voltage is modulated mainly by Modulation ratio (M) controlled by the inverter, so that the compression piston is driven to perform linear reciprocating motion and the compressed refrigerant expands rapidly in the expander to achieve the purpose of refrigeration. In practice, however, when M is used to modulate the amplitude of sinusoidal AC voltage, the input power and current will increase to a certain extent with the decreased M. To address the aforementioned concern, the correlated characteristics of output voltage of the inverter under the M and vector phase shift modes will be compared and analyzed in this paper for the selection of best driving mode for linear Stirling cryocoolers. Although the experiments reveal a small difference of sinusoidal voltage amplitude of the two modes under the same input voltage, and a basically same energy distribution of waveform at the fundamental frequency and other frequency multiplications, the required power and current are more stable and do not increase with the decreased output voltage amplitude in the mode of vector phase shift.
The vibration of a single-piston linear Stirling Cryocooler caused by the compressor operation seriously affects the component performance and imaging quality of the infrared detector, so in terms of vibration abatement, the use of a vibration absorber has become an important way of vibration damping. While during using the vibration absorber, the damping variation is an important factor affecting the vibration damping performance. Hence, through the experimental analysis of the damping variation of the vibration absorber, it is identified in this paper that the main reason for the damping variation is the variation of mass and amplitude of the vibration absorber, which affects the deformation of the plate spring and the internal friction energy dissipation of the material. It is discovered in the experiment that at the same amplitude, the damping variation is the most stable when the mass of the vibration absorber is 28.6g~36.4g and the amplitude is 1.6~2.1mm. In the end, a vibration-damping experiment is also carried out for the compressor using a vibration absorber with a mass of 33.1g. When the compressor operates at a working frequency of 75Hz and an input power of 6W, its vibration acceleration can be decreased from 42.274m/s2 before vibration damping to 3.047m/s2 .
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