This paper applies root locus theory in order to conduct a new convergence analysis for the stochastic FxLMS algorithm, without any simplifying assumption regarding the secondary path. The main steps to sketch the root locus of the FxLMS adaptation process are developed. Using the obtained root locus plot, the upper bound for the adaptation step-size beyond which the adaptation process becomes ...

An effective active noise control (ANC) system, based on identifying the so-called secondary path, can cancel the undesired noise. However, in some ANC applications, secondary path fluctuation will degrade the performance of noise cancellation. This paper proposes a novel average value algorithm with conventional filtered-X lease mean square (FXLMS) method to solve this problem. A method to tun...

Practical Active Noise Control (ANC) systems typically require a restriction in their maximum output power, to prevent overdriving the loudspeaker and causing system instability. Recently, minimum variance filtered-reference least mean square (MOV-FxLMS) algorithm was shown have optimal control under constraint with an analytically formulated penalty factor, but it needs offline knowledge of di...

In this paper, an active control structure used piezoelectric stack actuator is built to suppress vibration due to internal incentive in gear transmission. Because the gear system is timevariant and unknown, an offline modeling technique is unable to tracking the changes in the secondary path, an adaptive filter algorithm used online secondary path modeling method is proposed to the active vibr...

Several approaches have been introduced in literature for active noise control (ANC) systems. Since Filtered-x-Least Mean Square (FxLMS) algorithm appears to be the best choice as a controller filter. Researchers tend to improve performance of ANC systems by enhancing and modifying this algorithm. This paper proposes a new version of FxLMS algorithm. In many ANC applications an online secondary...

With the further development of automotive industry, traditional vibration isolation method is difficult to meet requirements for wide frequency bands under multiple operating conditions, active control mount (ACM) gradually paid attentions, and algorithm plays a decisive role. In this paper, ACM with oscillating coil actuator (OCA) taken as object, comparative study algorithms performed select...

This paper focuses on the adaptation mechanisms in adaptive hybrid controllers. Most adaptive hybrid controllers update two filters individually according to the filteredreference least mean squares (FxLMS) algorithm. Because this algorithm was derived for feedforward control, it does not take into account the presence of a feedback loop in the gradient calculation. This paper provides a deriva...

In the conventional hybrid active noise control (CHANC) algorithm, filtered-x least mean square (FXLMS) algorithm is used in both feedforward and feedback structures. However, FXLMS does not process reference signal error before updating weight vector, which leads to inadequate robustness of CHANC impulsive environment. To solve this problem, maximum versoria criterion incorporated into HANC (M...