【摘要】 热声斯特林热机的起振过程是一个非稳态过程。对热声斯特林热机的起振过程的压力信号变化进行了时域、频域、拟相空间的分析。在频域以及拟相空间中,对系统演化过程的定性分析表明,系统的起振过程存在一个明显的演化过程。而对拟相空间采用最大Lyapunov数的量化结果与对真实系统的物理过程的描述之间的比较可以看出,两者能很好的相互吻合,这说明作为判定系统稳定性的最大Lyapunov数能够描述系统的起振过程。更多还原

【Abstract】 The onset of oscillation in thermoacoustic engine was a non - static process. In this paper, the pressure signal that were acquired during onset of oscillation were analyzed in time - domain、frequency - domain and phase space. The qualitative analysis of frequency - domain and phase space indicated that it was apparently evolvement process. Then Maximum Lyapunov exponent was used to quantify phase space that is reconstructed from pressure signal. There are good agreement between the change of Lyapunov exponent versus time and evolving process of real system change. So it appeared that the characteristic parameter could be used to describe the onset of oscillation.更多还原