2,721 research outputs found
Vibration control of vehicles with active tuned mass damper
The purpose of this paper is to propose an alternative approach on controlling of vehicle vibrations by using active tuned mass damper. The approach is presented by simulation of a quarter-car model. Initially, a tuned mass damper is integrated on a vehicle model and its optimal parameters are determined by using 3D diagram of the maximum magnitudes of the sprung mass frequency response functions. Active control is obtained by adding an actuator element parallel to tuned mass damper. The fuzzy-sliding mode control method is utilized in reducing the displacement and acceleration magnitudes of sprung mass. Finally, comparison of active and passive responses in frequency and time domain are given to demonstrate vibration control improvement
State of the art of control schemes for smart systems featuring magneto-rheological materials
This review presents various control strategies for application systems utilizing smart magneto-rheological fluid (MRF) and magneto-rheological elastomers (MRE). It is well known that both MRF and MRE are actively studied and applied to many practical systems such as vehicle dampers. The mandatory requirements for successful applications of MRF and MRE include several factors: advanced material properties, optimal mechanisms, suitable modeling, and appropriate control schemes. Among these requirements, the use of an appropriate control scheme is a crucial factor since it is the final action stage of the application systems to achieve the desired output responses. There are numerous different control strategies which have been applied to many different application systems of MRF and MRE, summarized in this review. In the literature review, advantages and disadvantages of each control scheme are discussed so that potential researchers can develop more effective strategies to achieve higher control performance of many application systems utilizing magneto-rheological materials
Recommended from our members
Semi-Active Control Systems in Bridge Engineering: A Review of the Current State of Practice
In view of the grave socioeconomic consequences of earthquake damage to bridge structures, along with their critical role in modern and older road and rail networks, this article attempts to identify and summarise the current trends in the use of semi-active control technology in bridge engineering, as an enhanced seismic response control solution, combining increased adaptability and reliability, compared to passive and active schemes. In this context, representative analytical and experimental studies, as well as some full-scale applications of semi-active control devices are first reviewed and a brief description of relevant benchmark studies is subsequently presented, with a view to serving as a point of reference for further research and development. A framework of performance-based control principles aiming at the aforementioned objectives is finally set forth
Invited Review: Recent developments in vibration control of building and bridge structures
This paper presents a state-of-the-art review of recent articles published on active, passive, semi-active and hybrid vibration control systems for structures under dynamic loadings primarily since 2013. Active control systems include active mass dampers, active tuned mass dampers, distributed mass dampers, and active tendon control. Passive systems include tuned mass dampers (TMD), particle TMD, tuned liquid particle damper, tuned liquid column damper (TLCD), eddy-current TMD, tuned mass generator, tuned-inerter dampers, magnetic negative stiffness device, resetting passive stiffness damper, re-entering shape memory alloy damper, viscous wall dampers, viscoelastic dampers, and friction dampers. Semi-active systems include tuned liquid damper with floating roof, resettable variable stiffness TMD, variable friction dampers, semi-active TMD, magnetorheological dampers, leverage-type stiffness controllable mass damper, semi-active friction tendon. Hybrid systems include shape memory alloys-liquid column damper, shape memory alloy-based damper, and TMD-high damping rubber
Chattering-free sliding mode control with a fuzzy model for structural applications
This paper proposes a chattering-free sliding mode control (CFSMC) method for seismically excited structures. The method is based on a fuzzy logic (FL) model applied to smooth the control force and eliminate chattering, where the switching part of the control law is replaced by an FL output. The CFSMC is robust and keeps the advantages of the conventional sliding mode control (SMC), whilst removing the chattering and avoiding the time-consuming process of generating fuzzy rule basis. The proposed method is tested on an 8-story shear frame equipped with an active tendon system. Results indicate that the new method not only can effectively enhance the seismic performance of the structural system compared to the SMC, but also ensure system stability and high accuracy with less computational cost. The CFSMC also requires less amount of energy from the active tendon system to produce the desired structural dynamic response.ARC DE150101703 and ARC LP14010059
A new robust control using adaptive fuzzy sliding mode control for a DFIG supplied by a 19-level inverter with less number of switches
This article presents the powers control of a variable speed wind turbine based on a doubly fed induction generator (DFIG) because of their advantages in terms of economy and control. The considered system consists of a DFIG whose stator is connected directly to the electrical network and its rotor is supplied by a 19-level inverter with less number of switches for minimize the harmonics absorbed by the DFIG, reducing switching frequency, high power electronic applications because of their ability to generate a very good quality of waveforms, and their low voltage stress across the power devices. In order to control independently active and reactive powers provided by the stator side of the DFIG to the grid and ensure high performance and a better execution, three types of robust controllers have been studied and compared in terms of power reference tracking, response to sudden speed variations, sensitivity to perturbations and robustness against machine parameters variations.Π ΡΡΠ°ΡΡΠ΅ ΠΎΠΏΠΈΡΡΠ²Π°Π΅ΡΡΡ ΡΠΏΡΠ°Π²Π»Π΅Π½ΠΈΠ΅ ΠΌΠΎΡΠ½ΠΎΡΡΡΡ Π²Π΅ΡΡΡΠ½ΠΎΠΉ ΡΡΡΠ±ΠΈΠ½Ρ ΠΏΠ΅ΡΠ΅ΠΌΠ΅Π½Π½ΠΎΠΉ ΡΠΊΠΎΡΠΎΡΡΠΈ Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ Π°ΡΠΈΠ½Ρ
ΡΠΎΠ½Π½ΠΎΠ³ΠΎ Π³Π΅Π½Π΅ΡΠ°ΡΠΎΡΠ° Π΄Π²ΠΎΠΉΠ½ΠΎΠ³ΠΎ ΠΏΠΈΡΠ°Π½ΠΈΡ Π²Π²ΠΈΠ΄Ρ ΠΈΡ
ΠΏΡΠ΅ΠΈΠΌΡΡΠ΅ΡΡΠ² Ρ ΡΠΎΡΠΊΠΈ Π·ΡΠ΅Π½ΠΈΡ ΡΠΊΠΎΠ½ΠΎΠΌΠΈΡΠ½ΠΎΡΡΠΈ ΠΈ ΡΠΏΡΠ°Π²Π»Π΅Π½ΠΈΡ. Π Π°ΡΡΠΌΠ°ΡΡΠΈΠ²Π°Π΅ΠΌΠ°Ρ ΡΠΈΡΡΠ΅ΠΌΠ° ΡΠΎΡΡΠΎΠΈΡ ΠΈΠ· Π°ΡΠΈΠ½Ρ
ΡΠΎΠ½Π½ΠΎΠ³ΠΎ Π³Π΅Π½Π΅ΡΠ°ΡΠΎΡΠ° Π΄Π²ΠΎΠΉΠ½ΠΎΠ³ΠΎ ΠΏΠΈΡΠ°Π½ΠΈΡ, ΡΡΠ°ΡΠΎΡ ΠΊΠΎΡΠΎΡΠΎΠ³ΠΎ ΠΏΠΎΠ΄ΠΊΠ»ΡΡΠ΅Π½ Π½Π΅ΠΏΠΎΡΡΠ΅Π΄ΡΡΠ²Π΅Π½Π½ΠΎ ΠΊ ΡΠ»Π΅ΠΊΡΡΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΠ΅ΡΠΈ, Π° Π΅Π³ΠΎ ΡΠΎΡΠΎΡ ΠΏΠΈΡΠ°Π΅ΡΡΡ ΠΎΡ 19-ΡΡΠΎΠ²Π½Π΅Π²ΠΎΠ³ΠΎ ΠΈΠ½Π²Π΅ΡΡΠΎΡΠ° Ρ ΠΌΠ΅Π½ΡΡΠΈΠΌ ΠΊΠΎΠ»ΠΈΡΠ΅ΡΡΠ²ΠΎΠΌ ΠΊΠΎΠΌΠΌΡΡΠ°ΡΠΎΡΠΎΠ² Π΄Π»Ρ ΠΌΠΈΠ½ΠΈΠΌΠΈΠ·Π°ΡΠΈΠΈ Π³Π°ΡΠΌΠΎΠ½ΠΈΠΊ, ΠΏΠΎΠ³Π»ΠΎΡΠ°Π΅ΠΌΡΡ
Π³Π΅Π½Π΅ΡΠ°ΡΠΎΡΠΎΠΌ, ΡΠΌΠ΅Π½ΡΡΠ°Ρ ΡΠ°ΡΡΠΎΡΡ ΠΏΠ΅ΡΠ΅ΠΊΠ»ΡΡΠ΅Π½ΠΈΡ, ΠΈ ΡΡΡΡΠΎΠΉΡΡΠ² ΡΠΈΠ»ΠΎΠ²ΠΎΠΉ ΡΠ»Π΅ΠΊΡΡΠΎΠ½ΠΈΠΊΠΈ Π²ΡΠ»Π΅Π΄ΡΡΠ²ΠΈΠ΅ ΠΈΡ
ΡΠΏΠΎΡΠΎΠ±Π½ΠΎΡΡΠΈ Π³Π΅Π½Π΅ΡΠΈΡΠΎΠ²Π°ΡΡ Π²ΡΡΠΎΠΊΠΎΠ΅ ΠΊΠ°ΡΠ΅ΡΡΠ²ΠΎ ΡΠΈΠ³Π½Π°Π»ΠΎΠ² ΠΈ Π½ΠΈΠ·ΠΊΠΎΠ³ΠΎ ΡΡΠΎΠ²Π½Ρ Π½Π°ΠΏΡΡΠΆΠ΅Π½ΠΈΡ Π½Π° Π½ΠΈΡ
. Π§ΡΠΎΠ±Ρ Π½Π΅Π·Π°Π²ΠΈΡΠΈΠΌΠΎ ΡΠΏΡΠ°Π²Π»ΡΡΡ Π°ΠΊΡΠΈΠ²Π½ΠΎΠΉ ΠΈ ΡΠ΅Π°ΠΊΡΠΈΠ²Π½ΠΎΠΉ ΠΌΠΎΡΠ½ΠΎΡΡΡΡ, ΠΏΠΎΠ΄Π°Π²Π°Π΅ΠΌΠΎΠΉ ΡΡΠΎΡΠΎΠ½ΠΎΠΉ ΡΡΠ°ΡΠΎΡΠ° ΡΠΊΠ°Π·Π°Π½Π½ΠΎΠ³ΠΎ Π³Π΅Π½Π΅ΡΠ°ΡΠΎΡΠ° Π² ΡΠ΅ΡΡ, ΠΈ ΠΎΠ±Π΅ΡΠΏΠ΅ΡΠΈΠ²Π°ΡΡ Π²ΡΡΠΎΠΊΡΡ ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΠΈΡΠ΅Π»ΡΠ½ΠΎΡΡΡ ΠΈ Π»ΡΡΡΠ΅Π΅ ΠΊΠΎΠ½ΡΡΡΡΠΊΡΠΈΠ²Π½ΠΎΠ΅ ΠΈΡΠΏΠΎΠ»Π½Π΅Π½ΠΈΠ΅, ΠΈΠ·ΡΡΠ΅Π½Ρ ΠΈ ΡΠΎΠΏΠΎΡΡΠ°Π²Π»Π΅Π½Ρ ΡΡΠΈ ΡΠΈΠΏΠ° ΡΠΎΠ±Π°ΡΡΠ½ΡΡ
ΠΊΠΎΠ½ΡΡΠΎΠ»Π»Π΅ΡΠΎΠ² Ρ ΡΠΎΡΠΊΠΈ Π·ΡΠ΅Π½ΠΈΡ ΠΎΡΡΠ»Π΅ΠΆΠΈΠ²Π°Π½ΠΈΡ ΠΌΠΎΡΠ½ΠΎΡΡΠΈ, ΡΠ΅Π°ΠΊΡΠΈΠΈ Π½Π° Π²Π½Π΅Π·Π°ΠΏΠ½ΠΎΠ΅ ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΠ΅ ΡΠΊΠΎΡΠΎΡΡΠΈ, ΡΡΠ²ΡΡΠ²ΠΈΡΠ΅Π»ΡΠ½ΠΎΡΡΠΈ ΠΊ Π²ΠΎΠ·ΠΌΡΡΠ΅Π½ΠΈΡΠΌ ΠΈ ΡΡΡΠΎΠΉΡΠΈΠ²ΠΎΡΡΠΈ ΠΊ ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΡΠΌ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΠΎΠ² ΠΌΠ°ΡΠΈΠ½Ρ
Fuzzy sliding mode control of an offshore container crane
Β© 2017 A fuzzy sliding mode control strategy for offshore container cranes is investigated in this study. The offshore operations of loading and unloading containers are performed between a mega container ship, called the mother ship, and a smaller ship, called the mobile harbor (MH), which is equipped with a container crane. The MH is used to transfer the containers, in the open sea, and deliver them to a conventional stevedoring port, thereby minimizing the port congestion and also eliminating the need of expanding outwards. The control objective during the loading and unloading process is to keep the payload in a desired tolerance in harsh conditions of the MH motion. The proposed control strategy combines a fuzzy sliding mode control law and a prediction algorithm based on Kalman filtering for the MH roll angle. Here, the sliding surface is designed to incorporate the desired trolley trajectory while suppressing the sway motion of the payload. To improve the control performance, the discontinuous gain of the sliding control is adjusted with fuzzy logic tuning schemes with respect to the sliding function and its rate of change. Chattering is further reduced by a saturation function. Simulation and experimental results are provided to verify the effectiveness of the proposed control system for offshore container cranes
IMPLEMENTATION OF CONTROL ALGORITHMS IN BALL MAGNETIC LEVITATION SYSTEM TO IMPROVE SYSTEM PARAMETERS
Magnetic Levitation System (Maglev) is an approach which is currently widely applied in different areas like semiconductor, transportation, power generation, household appliances and etc. Since Magnetic Levitation System is a highly non-linear system, constructing a successful controller which has robust performance becomes a big challenge. The most conventional method of building Maglev is PID controller. However findings of controllerβs parameters which ar
An improved marine predators algorithm tuned data-driven multiple-node hormone regulation neuroendocrine-PID controller for multi-inputβmulti-output gantry crane system
Conventionally, researchers have favored the model-based control scheme for controlling gantry crane systems. However, this method necessitates a substantial investment of time and resources in order to develop an accurate mathematical model of the complex crane system. Recognizing this challenge, the current paper introduces a novel data-driven control scheme that relies exclusively on input and output data. Undertaking a couple of modifications to the conventional marine predators algorithm (MPA), random average marine predators algorithm (RAMPA) with tunable adaptive coefficient to control the step size ( CF) has been proposed in this paper as an enhanced alternative towards fine-tuning data-driven multiple-node hormone regulation neuroendocrine-PID (MnHR-NEPID) controller parameters for the multi-inputβmulti-output (MIMO) gantry crane system. First modification involved a random average location calculation within the algorithmβs updating mechanism to solve the local optima issue. The second modification then introduced tunable CF that enhanced search capacity by enabling usersβ resilience towards attaining an offsetting level of exploration and exploitation phases. Effectiveness of the proposed method is evaluated based on the convergence curve and statistical analysis of the fitness function, the total norms of error and input, Wilcoxonβs rank test, time response analysis, and robustness analysis under the influence of external disturbance. Comparative findings alongside other existing metaheuristic-based algorithms confirmed excellence of the proposed method through its superior performance against the conventional MPA, particle swarm optimization (PSO), grey wolf optimizer (GWO), moth-flame optimization (MFO), multi-verse optimizer (MVO), sine-cosine algorithm (SCA), salp-swarm algorithm (SSA), slime mould algorithm (SMA), flow direction algorithm (FDA), and the formally published adaptive safe experimentation dynamics (ASED)-based methods
- β¦