Advanced Vehicle Dynamics Through Active Aerodynamics and Active Body Control

2020 ◽  
Author(s):  
Henrique de Carvalho Pinheiro ◽  
Francesco Russo ◽  
Lorenzo Sisca ◽  
Alessandro Messana ◽  
Davide De Cupis ◽  
...  
Keyword(s):  
Control Systems ◽  
Concurrent Engineering ◽  
Vehicle Dynamics ◽  
Control Algorithm ◽  
Ad Hoc ◽  
Fuzzy Logic System ◽  
Control Algorithms ◽  
Active Suspensions ◽  
Handling Performance ◽  
Logic System

Abstract In this paper, the development procedure of an innovative control algorithm is shown, with the aim of improving handling performance of a high-end sport vehicle by actively controlling aerodynamic forces acting on the vehicle itself. The proposed control algorithm operates indirectly by modifying ride-heights of the vehicle through an active suspensions system. The vehicle dynamics analysis is conducted in parallel to the aerodynamics analysis performed in a concurrent engineering operation. The software used for control algorithms development is VI-CarRealTime, in co-simulation with Matlab-Simulink, with an extended use of the MaxPerformance package. Specific tracks have been implemented ad hoc to highlight the effects of the control systems operation in development phase. To better explore the potential of the technique, a fuzzy logic system was developed.

Frequency Shaped Semi-Active Control for Magnetorheological Fluid-Based Vibration Control Systems

2013 ◽  
Author(s):  
Young-Tai Choi ◽  
Norman M. Wereley ◽  
Gregory J. Hiemenz
Keyword(s):  
Vibration Control ◽  
Control Systems ◽  
Active Control ◽  
Control Algorithm ◽  
Active Vibration Control ◽  
Control Algorithms ◽  
Model Parameters ◽  
Mr Fluid ◽  
Control Current ◽  
Active Vibration

Novel semi-active vibration controllers are developed in this study for magnetorheological (MR) fluid-based vibration control systems, including: (1) a band-pass frequency shaped semi-active control algorithm, (2) a narrow-band frequency shaped semi-active control algorithm. These semi-active vibration control algorithms designed without resorting to the implementation of an active vibration control algorithms upon which is superposed the energy dissipation constraint. These new Frequency Shaped Semi-active Control (FSSC) algorithms require neither an accurate damper (or actuator) model, nor system identification of damper model parameters for determining control current input. In the design procedure for the FSSC algorithms, the semi-active MR damper is not treated as an active force producing actuator, but rather is treated in the design process as a semi-active dissipative device. The control signal from the FSSC algorithms is a control current, and not a control force as is typically done for active controllers. In this study, two FSSC algorithms are formulated and performance of each is assessed via simulation. Performance of the FSSC vibration controllers is evaluated using a single-degree-of-freedom (DOF) MR fluid-based engine mount system. To better understand the control characteristics and advantages of the two FSSC algorithms, the vibration mitigation performance of a semi-active skyhook control algorithm, which is the classical semi-active controller used in base excitation problems, is compared to the two FSSC algorithms.

scholarly journals Analysis of the efficiency of shipping containers handling/loading control methods and procedures

2019 ◽  
Vol 11 (1) ◽  
pp. 168781401882122 ◽  
Author(s):  
Tomas Eglynas ◽  
Mindaugas Jusis ◽  
Sergej Jakovlev ◽  
Audrius Senulis ◽  
Arunas Andziulis ◽  
...  
Keyword(s):  
Control Systems ◽  
Pid Controller ◽  
Control Algorithm ◽  
Dynamics Simulation ◽  
Control Algorithms ◽  
Negative Consequences ◽  
Cargo Handling ◽  
Additional Control ◽  
Shipping Containers ◽  
Laboratory Prototype

Most modern quay cranes operate under the operator’s control. Lifting, lowering, and transporting a container from one platform to another are just some of the actions that a person is responsible for, but the negative consequences of handling can be caused not only by his actions. An error, loading transient instability, or an undervalued environmental factor in the control algorithm can cause a risk to human safety, container, and cargo security. In order to control cargo-handling risk, it is necessary to improve the cargo control systems not only by changing their software, but also by creating additional control algorithms and systems. These systems with programmed control algorithms should be integrated into existing systems to control cargo security and its transfer time. In this article, transient processes and dynamic property of the cargo-handling operation are described and multibody dynamics simulation performed using laboratory prototype of a quay crane. The experimental research performed and integrated autonomous quay crane control algorithm developed with the proposed embedded container swinging control subroutine operated in optimal mode when the control system used PID controller with a feedback including additional PI controller and S-shaped input signal for the analyzed case with the defined parameter set.

scholarly journals A Contention-Based Hop-By-Hop Bidirectional Congestion Control Algorithm for Ad-Hoc Networks

Sensors ◽  
2019 ◽  
Vol 19 (16) ◽  
pp. 3484 ◽  
Author(s):  
Jiashuai Wang ◽  
Xiaoping Yang ◽  
Ying Liu ◽  
Zhihong Qian
Keyword(s):  
Congestion Control ◽  
Queue Length ◽  
Control Algorithm ◽  
Ad Hoc ◽  
Control Algorithms ◽  
Distributed Coordination ◽  
Current Node ◽  
Congestion Control Algorithm ◽  
Hoc Networks ◽  
Coordination Function

Existing hop-by-hop congestion control algorithms are mainly divided into two categories: those improving the sending rate and those suppressing the receiving rate. However, these congestion control algorithms have problems with validity and limitations. It is likely that the network will be paralyzed due to the unreasonable method of mitigating congestion. In this paper, we present a contention-based hop-by-hop bidirectional congestion control algorithm (HBCC). This algorithm uses the congestion detection method with queue length as a parameter. By detecting the queue length of the current node and the next hop node, the congestion conditions can be divided into the following four categories: 0–0, 0–1, 1–0, 1–1 (0 means no congestion, 1 means congestion). When at least one of the two nodes is congested, the HBCC algorithm adaptively adjusts the contention window of the current node, which can change the priority of the current node to access the channel. In this way, the buffer queue length of the congested node is reduced. When the congestion condition is 1–1, the hop-by-hop priority congestion control (HPCC) method proposed in this paper is used. This algorithm adaptively changes the adjustment degree of the current node competition window and improves the priority of congestion processing of the next hop node. The NS2 simulation shows that by using the HBCC algorithm, when compared with distributed coordination function (DCF) without congestion control, the proposed unidirectional congestion control algorithms hop-by-hop receiving-based congestion control (HRCC) and hop-by-hop sending-based congestion control (HSCC), and the existing congestion control algorithm congestion alleviation—MAC (CA-MAC), the average saturation throughput increased by approximately 90%, 62%, 12%, and 62%, respectively, and the buffer overflow loss ratio reduced by approximately 80%, 79%, 44%, and 79%.

Control Algorithms for Semi-Active Structural Systems: Do they Really Matter?

2008 ◽  
Vol 56 ◽  
pp. 182-187
Author(s):  
Antonio Occhiuzzi
Keyword(s):  
Control System ◽  
Control Systems ◽  
Active Control ◽  
Structural Control ◽  
Control Algorithm ◽  
Scientific Literature ◽  
Control Algorithms ◽  
Control Law ◽  
Structural Systems ◽  
Active Structural Control

Control algorithms for semi-active structural control system found in the scientific literature often rely on the choice of several parameters included in the control law. The present paper shows the preliminary conclusions of a study aiming to explain the weak dependency of the response reduction associated to semi-active control systems on the particular choice of the control algorithm adopted, provided that the relevant parameters of any control law be properly tuned.

scholarly journals An Efficient Routing Protocol Using an Improved Distance-Based Broadcasting and Fuzzy Logic System for VANET

2020 ◽  
Vol 13 (6) ◽  
pp. 81-93
Author(s):  
Khalid Kandali ◽  
◽  
Hamid Bennis ◽  
Keyword(s):  
Fuzzy Logic ◽  
Routing Protocol ◽  
Data Transmission ◽  
Ad Hoc Network ◽  
Ad Hoc ◽  
Mobile Ad Hoc Network ◽  
Network Routing ◽  
Fuzzy Logic System ◽  
Network Bandwidth ◽  
Logic System

The high mobility and frequent changes in the network topology remain a great divergence between Vehicular Ad-hoc Network (VANET) and Mobile Ad-hoc Network (MANET). This makes existing routing protocols for MANET imperfect for a VANET environment. In order to ensure good data transmission between vehicles, it is mandatory to improve these protocols to this new environment. Ad-hoc On-demand Distance Vector (AODV) is one of the most proposed reactive protocols in the literature for MANET, but its direct application in VANET returns poor performance results. In this paper, we propose an Efficient Routing Protocol using an improved Distance-Based Broadcasting and Fuzzy Logic System (ERPFL), which is an extension of the AODV routing protocol. In the first, the proposed scheme uses an improved Distance-Based Broadcasting method in route discovery process. Each vehicle selects the most suitable neighbours to send a route request, using different mobility parameters such as distance, velocity and direction. Then, the destination vehicle selects the best route from the most reliable routes received, using the Fuzzy Logic System. Link Expiration Time and Link Reliability Model are considered input metrics for this system. The simulation results show that ERPFL saves network bandwidth resources which contributes to a higher data transmission ratio. In addition, our proposed protocol efficiently distributes data packets, decreases the hop count and reduces network routing time.

scholarly journals Adaptive and Fuzzy Approaches for Nodes Affinity Management in Wireless Ad-Hoc Networks

2008 ◽  
Vol 4 (4) ◽  
pp. 273-295 ◽  
Author(s):  
Essam Natsheh ◽  
Tat-Chee Wan
Keyword(s):  
Ad Hoc Networks ◽  
Wireless Ad Hoc Networks ◽  
Routing Protocols ◽  
Ad Hoc ◽  
Fuzzy Logic System ◽  
Ad Hoc Routing ◽  
Hoc Networks ◽  
The Relationship ◽  
Nonlinear Fashion ◽  
Logic System

In most of the ad-hoc routing protocols, a static link lifetime (LL) is used for a newly discovered neighbors. Though this works well for networks with fixed infrastructures, it is inadequate for ad-hoc networks due to nodes mobility and frequent breaks of links. To overcome this problem, routing protocols with estimated LL using nodes affinity were introduced. However, these protocols also used the static estimated LL during the connection time. In contrast to that, in this paper two methods are presented to estimate LL based on nodes affinity and then continually update those values depending on changes of the affinity. In the first method, linear function is used to map the relationship between the signal strength fluctuation and LL. In the second method, fuzzy logic system is used to map this relationship in a nonlinear fashion. Significance of the proposed methods is validated using simulation. Results indicate that fuzzy method provides the most efficient and robust LL values for routing protocols.

On Motor Velocity Control by Using Only Position Measurements: Two Case Studies

2002 ◽  
Vol 39 (2) ◽  
pp. 118-127 ◽  
Author(s):  
Javier Moreno ◽  
Rafael Kelly
Keyword(s):  
Control Systems ◽  
Control Algorithm ◽  
Control Algorithms ◽  
Velocity Control ◽  
Motor Shaft ◽  
Introductory Course ◽  
Linear Description ◽  
Shaft Encoder ◽  
Basic Concepts ◽  
Motor Velocity

Velocity control by using only position measurements consists of finding a control algorithm that reconstructs the motor shaft velocity from the position measurements of the shaft encoder. The aim of this paper is to present the problem of velocity control in a linear description of a motor as paradigm in the application of the basic concepts of an introductory course in control systems; namely, transfer function, characteristic equation, stability, and Routh-Hurwitz criterion. Experiments have been carried out on a motor illustrating the performance of the velocity control algorithms discussed in this paper.

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