scholarly journals Foundation forces caused by dynamic air gap torques of converter driven induction motors influenced by active vibration control: a theoretical analysis

2021 ◽  
Author(s):  
Ulrich Werner
Keyword(s):  
Theoretical Analysis ◽  
Vibration Control ◽  
Induction Motors ◽  
Block Diagram ◽  
Active Vibration Control ◽  
Steel Frame ◽  
Air Gap ◽  
Control Concept ◽  
Active Vibration ◽  
The Time Domain

AbstractIn the paper, a theoretical analysis regarding foundation forces caused by dynamic air gap torques of converter-driven induction motors, influenced by active vibration control, is shown. Based on a plane model, where actuators are placed between the motor feet and steel frame foundation and where the vertical motor feet accelerations are controlled, a mathematical description in the time domain, Laplace domain, and Fourier domain is presented, as well as a block diagram for numerical simulation. A numerical example is shown, where a 2-pole induction motor (2 MW) is analyzed for different cases—motor directly mounted on a steel frame foundation (case 1), actuators between motor feet and foundation, operating passively (case 2) and actively (case 3). It could be shown, that with the presented active vibration control concept the foundation forces due to dynamic air gap torques can be clearly reduced.

Theoretical Investigation of a Structure for Active Vibration Control with Fuzzy Logic Approach

2014 ◽  
Vol 598 ◽  
pp. 529-533
Author(s):  
Erdi Gülbahçe ◽  
Mehmet Çelik ◽  
Mustafa Tinkir
Keyword(s):  
Mathematical Model ◽  
Fuzzy Logic ◽  
Vibration Control ◽  
Modal Analysis ◽  
Prediction Models ◽  
Block Diagram ◽  
Active Vibration Control ◽  
Control Block ◽  
Inference System ◽  
Active Vibration

The main purpose of this study is to prepare mathematical model for active vibration control of a structure. This paper presents the numerical and experimental modal analysis of aluminum cantilever beam in order to investigate the dynamic characteristics of the structure. The results will be used for active vibration control of structure’s experimental setup. Experimental natural frequencies are obtained and compared to verify the proposed numerical model by using modal analysis results. MATLAB System Identification Toolbox and ANSYS harmonic response function are used together to estimate beam’s equations of motion which include its amplitude, frequency and phase angle values. Moreover, the mathematical model of beam is simulated in MATLAB/Simulink software to determine the dynamic behavior of the proposed system. Furthermore, another prediction model approach with multiple input and single output is used to find the realistic behavior of beam via an adaptive neural-network-based fuzzy logic inference system, in addition, impulse responses of the proposed models are compared and the control block diagram for active vibration control is implemented. As a first iteration, PID type controller is designed to suppress vibrations against the disturbance input. The results of modal analysis, the prediction models, controlled and uncontrolled system responses are presented in graphics and tables for obtaining a sample numerical active vibration control.

scholarly journals Identification of Chatter Vibrations and Active Vibration Control by Using Sliding Mode Controller on Dry Turning of Ti6al4v

2021 ◽  
Author(s):  
Mehmet Ali GUVENC ◽  
Hasan Huseyin BILGIC ◽  
Selçuk MISTIKOĞLU
Keyword(s):  
Vibration Control ◽  
Active Control ◽  
Finite Impulse Response ◽  
Sliding Mode ◽  
Block Diagram ◽  
Active Vibration Control ◽  
Control Block ◽  
Acceleration Data ◽  
Chatter Vibrations ◽  
Active Vibration

Abstract In recent years, with the development of sensor technologies, communication platforms, cyber physical systems, storage technologies, internet applications and controller infrastructures, the way has been opened to produce competitive products with high quality and low cost. In turning, which is one of the important processes of machining, chatter vibrations are among the biggest problems affecting product quality, productivity and cost. There are many techniques proposed to reduce chatter vibrations for which the exact cause cannot be determined. In this study, an active vibration control based on Sliding Mode Control (SMC) has been implemented in order to reduce and eliminate chatter vibration, which is undesirable for the turning process. In this context, three-axis acceleration data were collected from the cutting tool during the turning of Ti6Al4V. Finite Impulse Response (FIR) filtering, Fast Fourier Transform (FFT) analysis and integral process were carried out in order to use the raw acceleration data collected over the system in control. The system was modeled mathematically and an active control block diagram was created. It was observed that chattering decreased significantly after the application of active vibration control. The surface quality formed by the amplitude of the graph obtained after active control has been compared and verified with the data obtained from the actual manufacturing result.

scholarly journals Simulation and Experimental Study on Vibration and Sound Radiation Control with Piezoelectric Actuators

2011 ◽  
Vol 18 (1-2) ◽  
pp. 343-354 ◽  
Author(s):  
Zhiyi Zhang ◽  
Yong Chen ◽  
Hongguang Li ◽  
Hongxing Hua
Keyword(s):  
Vibration Control ◽  
Sound Pressure ◽  
Active Vibration Control ◽  
Coupled Model ◽  
Piezoelectric Actuators ◽  
Adaptive Method ◽  
Vibration Responses ◽  
Active Vibration ◽  
Vibration And Sound Radiation ◽  
The Time Domain

FEM/BEM is adopted to model the interaction between the fluid and structures. In the modeling, modal truncation and inertial coupling are applied to sufficiently reduce the coupled model order. This approach is adopted for the purpose of constructing a modal model in the time domain. Active vibration control is realized with piezoelectric actuators and an adaptive method. In the control, the summation of vibration responses is used as the control error since the integral of acceleration on the plate surface is approximately proportional to the far field sound pressure. A rigidly baffled plate connected with a mass through one piezoelectric actuator is simulated at first. In the experiment, the plate is excited by a rotating eccentric mass and controlled with four piezoelectric actuators. The results have shown that active vibration control with the piezoelectric actuators can lead to a noticeable attenuation in sound pressure.

Active Vibration Control of a Double-Curved Shell Structure Using the Example of Stuttgart Smartshell

2012 ◽  
Author(s):  
Martin Weickgenannt ◽  
Oliver Sawodny ◽  
Stefan Neuhaeuser ◽  
Werner Sobek
Keyword(s):  
Vibration Control ◽  
Control Strategy ◽  
Shell Structure ◽  
Active Vibration Control ◽  
Optimal Control Strategy ◽  
Present Contribution ◽  
Control Concept ◽  
Hydraulic Cylinders ◽  
Active Vibration ◽  
System States

The present contribution deals with concepts for active vibration control of a thin double-curved shell structure. The structure, Stuttgart SmartShell, is located at the University of Stuttgart. It is made of softwood and is equipped with strain gages to determine the state of static and dynamic loading. Furthermore a force input is provided at the supports of the structure using hydraulic cylinders. Here a model-based two-degree-of-freedom control concept for vibration damping is presented which is based on a dynamical model derived from Finite Element simulations. The control strategy uses modal decoupling of the system states to enable the manipulation and damping of single eigenmodes. An optimal control strategy is chosen to dampen oscillations as quickly as possible while considering limitations on the force input and peak stresses. The proposed control algorithms are applied to the shell structure under consideration and their applicability is demonstrated by simulation and experimental results.

scholarly journals Adaptive Feedforward Compensating Self-Sensing Method for Active Flutter Suppression

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3447 ◽  
Author(s):  
Yizhe Wang ◽  
Zhiwei Xu
Keyword(s):  
Vibration Control ◽  
Bridge Circuit ◽  
Active Vibration Control ◽  
Local Strain ◽  
The Self ◽  
Negative Effects ◽  
Active Vibration ◽  
And Performance ◽  
The Time Domain ◽  
Application Fields

A single piezoelectric patch can be used as both a sensor and an actuator by means of the self-sensing piezoelectric actuator, and the function of self-sensing shows several advantages in many application fields. However, some problems exist in practical application. First, a capacitance bridge circuit is set up to realize the function of self-sensing, but the precise matching of the capacitance of the bridge circuit is hard to obtain due to the standardization of electric components and variations of environmental conditions. Second, a local strain is induced by the self-sensing actuator that is not related to the global vibration of the structure, which would affect the performance of applications, especially in active vibration control. The above problems can be tackled by the feedforward compensation method that is proposed in this paper. A configured piezoelectric self-sensing circuit is improved by a feedforward compensation tunnel, and a gain of compensation voltage is adjusted by the time domain and frequency domain’s steepest descent algorithms to alleviate the capacitance mismatching and local strain problems. The effectiveness of the method is verified in the experiment of the active vibration control in a wind tunnel, and the control performance of compensated self-sensing actuation is compared to the performance with capacitance mismatching and local strain. It is found that the above problems have negative effects on the stability and performance of the vibration control and can be significantly eliminated by the proposed method.

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