Quantification of Active Structural Path for Vibration Reduction Control of Plate Structure under Sinusoidal Excitation

Abstract

The engines of electric and hybrid vehicles cause vibration and noise with complex frequency spectra. This tendency is observed especially for mid-frequency components. Therefore, there are limitations in achieving vibration attenuation using only structural changes, which is the conventional isolation method. A smart structure-based active engine mounting system is a core technology that can continuously improve the noise, vibration, and harshness performance under various operating conditions by continuously controlling the dynamic characteristics of the mount. It can replace the existing mount technology which supports the engine by realizing both static and dynamic stiffness. This study focuses on vibration reduction for a typical mid-frequency excitation. Based on a source–path–receiver structure, a mathematical model for a 3D plate structure with three active paths is proposed. The amplitude and phase of the actuator were calculated for the reduction of given vibrations on the basis of the model. When controlling with the proposed method, it was necessary to perform a large amount of computation and to newly define the modeling according to the structural change. To solve this inconvenience, the NLMS (normalized least mean squares) algorithm was applied, and the results were compared. It is shown that the application of the NLMS algorithm to perform the overall vibration reduction is more effective than the previous method.

Optimal placement criteria of actuators for hybrid mounting system on a non-aligned plate structure

“…An active engine mount system with a hydraulic actuator is designed and controlled by an adaptive controller. The results show that the proposed method can effectively reduce vibration 14 . Passive and active components combined with a sliding mode controller show good control performance in a wide frequency range from 20 Hz to 1 kHz 15 .…”

“…An adaptive controller for Active Engine Mount (AEM) is proposed according to the dynamic characteristics of hydraulic engine mount. Experiments have shown that the proposed system can reduce the force transmitted through the AEM 14 . A novel active mount using piezoelectric stack actuators and rubber elements is designed.…”

Bidirectional Multi-Spectral Vibration Control: Insights from Automotive Engine Mounting Systems in Two-Dimensional Structures with a Damaged Vertical Active Element

“…Furthermore, Hong and Kim [19] conducted an analytical investigation on a mounting system that included a PZT stack actuator and rubber mount on a vehicle model with a plate structure and then also utilized one active mount and two rubber mounts; their findings verified the suitability of the system. In addition, Hong and Kim [20] developed a quantification technique to identify the best inputs for active structural routes analytically. The derived inputs must be adjusted through experimentation; however, they perform well numerically.…”

“…Applying the excitation and control forces to the mount coordinate model yields a response at each location. Equation (20) displays each position response.…”

Feasibility Study on Active Structural Attenuation: Addressing Multiband Vibration in Automotive Vehicles on 2D Asymmetric Structures with a Faulty Horizontal Actuator

“…Hong and Kim [19] analyzed a mounting system comprising three mounts, including one active path, along with the combination of a piezoelectric stack actuator and a passive mount on a plate-structured automotive model. Hong and Kim [20] devised a quantification method for analytically determining the optimal inputs for active structural trajectories. Numerically, the derived inputs performed admirably, but they may benefit from some experimental tuning.…”