Active vibration isolation systems are being considered to improve the performance of spacecraft instruments and sensors. Because of uncertainties inherent in on-orbit operation, adaptive control strategies and algorithms have relevance to these systems. In this paper, analysis of the algorithms, numerical simulation, and laboratory test data are used to evaluate adaptive feedforward control. O...

Gears are the most important parts of rotating machinery and power transmission devices. When gears engaged in meshing transmission, vibration will occur due to factors such as gear machining errors, rigidity, impact. The traditional FxLMS algorithm, a common active has been widely studied applied system control recent years. However, it is difficult achieve good performance convergence speed p...

In many active noise control (ANC) applications, an online secondary path modelling method that uses a white noise as a training signal is required. This paper proposes a new feedback ANC system. Here we modified both the FxLMS and the VSS-LMS algorithms to raised noise attenuation and modelling accuracy for the overall system. The proposed algorithm stops injection of the white noise at the op...

In many active noise control (ANC) applications, an online secondary path modelling method that uses a white noise as a training signal is required. This paper proposes a new feedback ANC system. Here we modified both the FxLMS and the VSS-LMS algorithms to raised noise attenuation and modelling accuracy for the overall system. The proposed algorithm stops injection of the white noise at the op...

The paper deals with two fundamentally different approaches for active control of engine-induced vibrations in automotive vehicles. On the one hand the well-known adaptive feedforward approach with a reference sensor is presented. On the other hand the use of feedback structures is also discussed. Both approaches for active vibration control have been simulated and tested intensively in a passe...

In this paper a 2-DOF lumped mass model is used for dynamic modelling of a turning process. The cutting forces are modelled using predictive machining theory based on the Merchant cutting force model. Cutting parameters such as shear angle are calculated using experimental relations. Variation of cutting angles is also considered. Regarding the governing delayed differential equations, the mode...

In this paper, a design technique is proposed for a disturbance feedforward compensation control to attenuate disturbance responses in an active magnetic bearing system, which is subject to base motion. To eliminate the sensitivity of model accuracy to disturbance responses, the proposed design technique is an experimental feedforward compensator, developed from an adaptive estimation, by means...

As a typical active noise control algorithm, Filtered-x Least Mean Square (FxLMS) is widely used in the field of audio denoising. In this study, an denoising coprocessor based on Retrenched Injunction System Computer-V (RISC-V), custom instruction set extension was designed and software hardware co-design adopted; traditional pure implementation, accelerator optimization design carried out, con...

In a conventional narrowband active noise control system, each reference cosine wave has to be filtered by an estimate of the secondary-path. We call this part x-filtering block. The number of x-filtering blocks is equal to the number of targeted frequencies. The computational cost of the system due to the x-filtering operations may form a bottleneck in real system implementation. In this paper...