The Floating Potential Fluctuations (FPF) observed in a dc glow discharge plasma powered with two sources is modeled using an anharmonic oscillator with two forcing terms. In the discharge system, one of the electrode is biased to a negative voltage source (i.e. cathode), and the second electrode is biased to a positive voltage source (i.e. anode), while the stainless-steel vacuum chamber is grounded. The dc glow discharge plasma is generated by application of negative voltage on the cathode with respect to the grounded chamber using one of the power supplies. On application of positive voltage to the anode using second power supply results in formation of potential structure on achieving the triggering criteria. This potential structure is referred as anodic double layer (ADL). The evolution of ADL is associated with FPF. Therefore, FPF is analyzed to characterize the ADL's dynamical features. In this work, the experimentally observed FPF compared with numerically obtained oscillations using an anharmonic oscillator model with two forcing terms. Each of these forcing terms are associated with the two power supplies used in the experiment. The experimentally and numerically obtained oscillations from the model are studied using phase-space plot, FFT, Largest Lyapunov exponent (LLE). The dynamical features of oscillations obtained by the model show strong agreement with the experiment and can be extended for a description of complex systems driven by multiple forces.

在由两个源供电的直流辉光放电等离子体中观察到的浮动电位波动 (FPF) 使用具有两个强迫项的非谐波振荡器建模。在放电系统中，其中一个电极被偏置到负电压源（即阴极），而第二个电极被偏置到一个正电压源（即阳极），而不锈钢真空室是接地的。直流辉光放电等离子体是通过使用电源之一在接地室的阴极上施加负电压而产生的。在使用第二电源向阳极施加正电压时，会形成达到触发标准的电位结构。这种电位结构称为阳极双层 (ADL)。ADL 的演变与 FPF 相关。所以，分析 FPF 以表征 ADL 的动态特征。在这项工作中，实验观察到的 FPF 与使用具有两个强迫项的非谐振荡器模型通过数值获得的振荡进行了比较。这些强制项中的每一个都与实验中使用的两个电源相关。使用相空间图、FFT、最大李雅普诺夫指数 (LLE) 研究从模型中通过实验和数值获得的振荡。该模型获得的振荡动力学特征与实验结果非常吻合，可以扩展用于描述多力驱动的复杂系统。这些强制项中的每一个都与实验中使用的两个电源相关。使用相空间图、FFT、最大李雅普诺夫指数 (LLE) 研究从模型中通过实验和数值获得的振荡。该模型获得的振荡动力学特征与实验结果非常吻合，可以扩展用于描述多力驱动的复杂系统。这些强制项中的每一个都与实验中使用的两个电源相关。使用相空间图、FFT、最大李雅普诺夫指数 (LLE) 研究从模型中通过实验和数值获得的振荡。该模型获得的振荡动力学特征与实验结果非常吻合，可以扩展用于描述多力驱动的复杂系统。