A Preliminary Study of Active Stabilization for Agricultural Machines Using a Movable Mass

2019 ◽  
Author(s):  
Marco Bietresato ◽  
Roberto Belotti ◽  
Karl D. von Ellenrieder ◽  
Fabrizio Mazzetto
Keyword(s):  
Vehicle Stability ◽  
Stabilization System ◽  
Additional Mass ◽  
Track Width ◽  
Active Stabilization ◽  
Preliminary Study ◽  
Turning Radius ◽  
Euler Spiral ◽  
Agricultural Machines ◽  
High Center

Abstract Side overturning is a potentially dangerous phenomenon that can easily happen to agricultural machines because they typically have a high center-of-gravity (CoG) and a very narrow track-width (e.g., tractors operating in orchards). Overturning occurs when the direction of the resultant of the forces acting on the vehicle CoG intercepts the support plane outside of the “support polygon”, defined by taking the footprints of the vehicle wheels as its vertices. Here, we propose the use of a stabilization system that shifts the CoG position to ensure that the resultant force stays within the support polygon. This active stabilization is accomplished by equipping the vehicle with an additional mass that can be moved using an actuator. Using numerical simulations of a four-wheeled narrow-track tractor moving along a trajectory at constant speed, we characterize how the position of the movable mass affects vehicle stability under a quasi-static assumption. The path is a horizontal Euler spiral, having a continuously varying turning radius. The simulations are used to: (i) analyze the sensitivity of four metrics related to the vehicle stability with respect to the additional weight of the moveable mass and the position of the stabilization system, and (ii) find an optimal configuration of the stabilization system that will improve the operational limits of the vehicle.

Analysis of an active stabilization system for a holographic setup

1988 ◽  
Vol 27 (10) ◽  
pp. 1967 ◽  
Author(s):  
Jaime Frejlich ◽  
Lucila Cescato ◽  
Geraldo F. Mendes
Keyword(s):  
Stabilization System ◽  
Active Stabilization

scholarly journals Improvement of Vehicle Stability Using Reinforcement Learning

2018 ◽  
Author(s):  
Janaína R. Amaral ◽  
Harald Göllinger ◽  
Thiago A. Fiorentin
Keyword(s):  
Reinforcement Learning ◽  
Learning Algorithm ◽  
Rear Wheel ◽  
Vehicle Stability ◽  
Sideslip Angle ◽  
Vehicle Handling ◽  
Race Car ◽  
Torque Vectoring ◽  
Preliminary Study ◽  
The Cost

This paper presents a preliminary study on the use of reinforcement learning to control the torque vectoring of a small rear wheel driven electric race car in order to improve vehicle handling and vehicle stability. The reinforcement learning algorithm used is Neural Fitted Q Iteration and the sampling of experiences is based on simulations of the vehicle behavior using the software CarMaker. The cost function is based on the position of the states on the phase-plane of sideslip angle and sideslip angular velocity. The resulting controller is able to improve the vehicle handling and stability with a significant reduction in vehicle sideslip angle.

The Preliminary Study of Fin and Rudder Multivariate Hybrid Control System- Advanced Rudder Roll Stabilization System-

2001 ◽  
Vol 34 (7) ◽  
pp. 461-466 ◽  
Author(s):  
Hiroyuki Oda ◽  
Masamitsu Kanda ◽  
Takashi Hyodo ◽  
Keiji Nakamura ◽  
Hiroyuki Fukushima ◽  
...  
Keyword(s):  
Control System ◽  
Hybrid Control ◽  
Stabilization System ◽  
Preliminary Study ◽  
Roll Stabilization ◽  
Hybrid Control System

A Parameterized Simulation Model for Multi-Axle Vehicle

2011 ◽  
Vol 186 ◽  
pp. 170-175
Author(s):  
Li Qiang Jin ◽  
Chuan Xue Song
Keyword(s):  
Simulation Model ◽  
Present Model ◽  
Equations Of Motion ◽  
Steering System ◽  
Slip Angle ◽  
Vehicle Stability ◽  
Tire Model ◽  
Body System ◽  
Turning Motion ◽  
Turning Radius

This paper presents a mathematical model for multi-axle vehicles Inclusive of steering system, suspension system, tire model, body system. Considering possible factors related to turning motion such as vehicle configuration and suspension, equations of motion were constructed to predict steerability and stability of these vehicles. Turning radius, slip angle at the mass center, and each wheel velocity were obtained by numerically solving the equations. The simulation model is made by MATLAB based on the mathematic equation. To analyze the influence of the wheelbase layout on vehicle stability, driving performance and stability of the vehicle with three wheelbase layout is simulated based on the present model. It is concluded that the wheelbase between second axle and third axle should be long to get better stability when vehicle turning with rear axles.

Designing a model rocket with active stabilization and orientation in the guidance plane on the post-boost and boost-phase trajectory

2020 ◽  
Author(s):  
P.Yu. Pavlenko ◽  
D.I. Poberezhny ◽  
Z.S. Garbuzov ◽  
I.S. Udovik ◽  
M.V. Lysenko ◽  
...  
Keyword(s):  
Control System ◽  
Automatic Control ◽  
Automatic Control System ◽  
Phase Trajectory ◽  
Stabilization System ◽  
Launch Vehicles ◽  
Technical Requirements ◽  
Active Stabilization ◽  
Design And Manufacture ◽  
Orientation Systems

Within the framework of a collective technical project for the creation of a small-lift class launch vehicle, this paper discusses the development of a model rocket design with an automatic control system designed to test active stabilization and orientation systems of the rocket in the guidance plane on the post-boost and boost-phase trajectory. The paper introduces several variants of the rocket layout and its design, presents the results of design and manufacture. Furthermore, the study emphasizes the issues of designing the orientation and stabilization system of a model rocket. Within the study, we carried out a preliminary strength calculation of the design of the rocket controls, analyzed the design and ergonomics of the stabilizers. The study shows that the rocket made complies with the technical requirements specified in the technical task for it, and stresses the prospects of using small-lift launch vehicles for launching small spacecraft.

scholarly journals ANALISIS STABILITAS RANCANGAN GANESHA ELECTRIC VEHICLES 1.0 GENERASI 1 BERTRANSMISI CONTINOUS VARIABLE TRANSMISION (CVT) MENGGUNAKAN METODE QUASI STATIS

2020 ◽  
Vol 4 (1) ◽  
Author(s):  
I Wayan Adi Sumertama ◽  
Kadek Rihendra Dantes ◽  
Kadek Yota Ernanda Aryanto
Keyword(s):  
Electric Vehicles ◽  
Critical Speed ◽  
Continuous Variable ◽  
Rolling Speed ◽  
Vehicle Stability ◽  
Turn Angle ◽  
Continuous Variable Transmission ◽  
Variable Transmission ◽  
Behavioral Responsiveness ◽  
Turning Radius

Penelitian ini bertujuan untuk mengetahui kesetabilan kendaraan dengan melakukan pengamatan terhadap batas kecepatan kendaraan yang diijinkan saat berbelok dengan sudut tertentu. Parameter tersebut diukur untuk dapat mengetahui kecepatan kritis dimana kendaraan akan skid dan mengalami rolling speed. Dengan mengetahui kecepatan kritis kendaraan akan membantu pengemudi untuk mengendalikan kecepatan kendaraan pada saat berbelok pada radius belok tertentu. Hasil dari penelitian Analisis Stabilitas Belok Rancangan Kendaraan Ganesha Electric Vehicles 1.0 Generasi 1 Bertransmisi Continous Variable Transmision (CVT) Dengan Menggunakan Metode Quasi Statis Berbasis Microsoft Visual Studio Dengan Bahasa Pemrograman C# yaitu kendaraan cendrung mempunyai prilaku responsif pada saat berbelok yaitu oversteer pada saat kecepatan konstan dan terjadi skid pada kecepatan 20 km/jam dan rolling speed baru akan terjadi pada kecepatan 30 km/jam dimana; skid depan terjadi pada sudut belok depan (αf) = 420 dengan kecepatan skid depan (Vsf)= 10,9 km/jam,dan kendaraan mengalami rolling speed pada sudut belok depan (af)= 390 dengan kecepatan rolling speed (Vg)= 22,4 km/jam. Kata Kunci : Kata kunci : rolling speed , skid, stabilitas, sudut belok. This study aimed to determine the vehicle stability by observing the speed limit allowable vehicle when turning at an angle . These parameters were measured in order to determine critical speed where the vehicle will skid and experience rolling speed.By knowing the critical speed of the vehicle will help the driver to control the vehicle's speed at the time to turn at certain turning radius. The results of the study Stability Analysis Turn draft Vehicles Ganesha Electric Vehicles 1.0 Generation 1 transmission Continuous Variable Transmission (CVT) Method Using Quasi Static-based Microsoft Visual Studio with programming language C # that vehicle tends to have behavioral responsiveness during turns that oversteer during constant speed and skid occurs at a speed of 20 km / h and the rolling speed will occur at a speed of 30 km / h where; front skid occurred on a front turn angle (αf) = 420 with front skid speed (Vsf) = 10.9 km / h, and the vehicle is rolling speed at the next turn angle (af) = 390 with a speed of rolling speed (Vg) = 22 , 4 km / h. keyword : Keywords : angle of turn , rolling speed, skid,stability.

scholarly journals ON DETERMINATION OF ARMORED VEHICLES MOTION STABILITY ON A CURVED TRAJECTORY

2020 ◽  
pp. 4-7
Author(s):  
О. Akimov ◽  
V. Boiarov
Keyword(s):  
Dynamic Characteristics ◽  
Vehicle Stability ◽  
Natural Oscillations ◽  
Motion Stability ◽  
Gross Vehicle Weight ◽  
Armored Vehicles ◽  
Turning Radius ◽  
Armored Vehicle ◽  
The Stability

The article analyzes methods for assessing the stability of the armored vehicles motion on a curved trajectory. The development of new types of armored vehicles and the modernization of existing ones require ensuring its stability of motion to overturn. The motion on a curved trajectory when making turns and overtaking is especially dangerous. Determination of armored vehicles stability to overturn to ensure safe movement is an urgent problem, which is closely associated with the solution of important scientific and practical problems. Numerous scientific works have been devoted to the study of the dynamics of automobiles, on which the methods for calculating dynamic characteristics are based. Assessment of armored vehicles motion stability to overturn can be carried out by experimental methods, in particular by loading it with a static moment until the wheels come off and start tipping over or by placing it on an inclined platform that can change the tilt angle, fixing the beginning of the tipping Determination of an armored vehicle stability during road tests can be carried out at training ranges when moving in a certain turning radius with different maneuvering speeds, fixing the beginning of the overturn, but this method contains certain deficiencies associated with the need to strictly control the beginning of the overturn. A method is proposed for determination of armored vehicles motion stability taking into account the dynamic characteristics of the armored vehicles. A dynamic model of natural oscillations of the vehicle in a horizontal plane in the perpendicular direction to the motion allows to determine the frequency of natural oscillations at gross vehicle weight. An approach of an armored vehicle’s angular velocity when moving on a curved trajectory to the frequency of natural oscillations leads to an increase in the coefficient of dynamism of the mechanical system as well as to a probability increase of overturn of an armored vehicle. Recommendations on choosing a safe speed when making turns at various turning radii were developed.

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