An Efficient Parking Solution: A Cam-Linkage Double-Parallelogram Mechanism Based 1-Degrees of Freedom Stack Parking System

2019 ◽  
Vol 11 (4) ◽  
Author(s):  
Chengyuan Zhang ◽  
Xiaomin Zhang ◽  
Hongyun Ye ◽  
Ming Wei ◽  
Xianxiong Ning
Keyword(s):  
Degrees Of Freedom ◽  
Digital Simulation ◽  
Residential Area ◽  
Practical Approach ◽  
Ground Vehicles ◽  
Parking Problem ◽  
Short Period ◽  
Parking System ◽  
Fillet Transition ◽  
Compact Mechanism

To solve the difficult parking problem, developing a mechanical parking device is a practical approach. Aiming at longitudinal parking, a novel compact double-stack parking system is put forward based on a 1-DOF (degree of freedom) cam-linkage double-parallelogram mechanism. Due to the unique structure, the whole device can be driven by a single motor to realize three motion periods, including lifting, translation, and fillet transition. Meanwhile, all parts of this compact mechanism can be well contained in the filleted rectangular trajectory. This rectangular trajectory is essential that we no longer need to take out the ground vehicles so as to realize stack parking. Furthermore, to overcome the singularity collinear problem of the parallelogram which may lead to the polymorphic state, the double-parallelogram mechanism is proposed to maintain the orientation of the parking platform. The digital simulation and kinetostatic analysis results demonstrate the feasibility that this novel cam-linkage double-parallelogram mechanism can improve the space utilization of the residential area, alleviate the parking problem, and can be quickly put into application on campuses or streets in a short period.

Analysis on Parking Problem for Residential Area

2012 ◽  
Vol 193-194 ◽  
pp. 1075-1078
Author(s):  
Xue Ying Wang ◽  
Chun Xiang Liu ◽  
Dong Xu
Keyword(s):  
Difficult Problem ◽  
Paper Analysis ◽  
Residential Area ◽  
Residential Areas ◽  
Parking Problem ◽  
Parking Facilities ◽  
Day By Day ◽  
Living Area ◽  
The Way

Currently, small car quantity of residents in the our country city is raise year by year.The parking problem of in each city's living area is outstanding day by day. Aimming at the difficult problem of parking the car, The paper analysis the reason for producing it, probes the countermeasures and solutions to the parking problems in residential areas from two aspects of parking index and the way of parking facilities.

scholarly journals Automatic Parallel Car Parking System using Sensors and Arduino UNO

2019 ◽  
Vol 8 (2S11) ◽  
pp. 3531-3534
Keyword(s):  
Parallel Parking ◽  
New Model ◽  
Parking Lots ◽  
Electric Cars ◽  
Electric Car ◽  
Parking Problem ◽  
Parking System ◽  
Arduino Uno ◽  
Pass Through

In this busy world, people are tending towards automation in all routine works which in turn is saving their time. Due to the increased use of cars and congesting places, everywhere we are facing a queue to pass through. One such queue we face is in the parallel parking lots. For solving this problem, many automobile manufacturers have come up with Auto Parking Features in New Model Cars. Then what about Old Cars? Shouldn’t those Old Cars get modified with this Auto Parking facility? Yes, they can get modified with our proposed solution. In this paper, we are presenting a solution in the form of a module for the parallel parking problem called “Automatic Parallel Car Parking System – using Sensors and Arduino UNO”. Along with New Cars, this module can also be integrated with Old Electric Cars to bring Auto Parallel Park feature. This paper also discusses existing Auto Parallel Parking Systems. It also discusses the proposed solution by solving the flaws in existing solutions. The proposed solution is easily adaptable, with small modifications to an electric car. Future enhancements are also proposed.

First-Crossing Problem of Weakly Coupled Strongly Nonlinear Oscillators Subject to a Weak Harmonic Excitation and Gaussian White Noises

2018 ◽  
Vol 140 (4) ◽  
Author(s):  
Y. J. Wu ◽  
H. Y. Wang
Keyword(s):  
Harmonic Function ◽  
Degrees Of Freedom ◽  
High Efficiency ◽  
Digital Simulation ◽  
Stochastic Averaging ◽  
Harmonic Excitation ◽  
Van Der Pol Oscillator ◽  
Strongly Nonlinear ◽  
Set Up ◽  
White Noises

We study first-crossing problem of two-degrees-of-freedom (2DOF) strongly nonlinear mechanical oscillators analytically. The excitation is the combination of a deterministic harmonic function and Gaussian white noises (GWNs). The generalized harmonic function is used to approximate the solutions of the original equations. Four cases are studied in terms of the types of resonance (internal or external or both). For each case, the method of stochastic averaging is used and the stochastically averaged Itô equations are obtained. A backward Kolmogorov (BK) equation is set up to yield the failure probability and a Pontryagin equation is set up to yield average first-crossing time (AFCT). A 2DOF Duffing-van der Pol oscillator is chosen as an illustrative example to demonstrate the effectiveness of the analytical method. Numerically analytical solutions are obtained and validated by digital simulation. It is shown that the proposed method has high efficiency while still maintaining satisfactory accuracy.

scholarly journals Digital simulation cylindrical milling process with end mills

2021 ◽  
Author(s):  
Yurii Petrakov ◽  
Maksym Sikailo
Keyword(s):  
Degrees Of Freedom ◽  
Block Diagram ◽  
Digital Simulation ◽  
Numerical Algorithms ◽  
Research Process ◽  
Milling Process ◽  
Cutting Process ◽  
Mass Model ◽  
Delay Argument ◽  
Machining System

Any cutting process is accompanied by vibrations that can lead to a chatter of machining surface and even to a loss of stability. Mathematical modeling helps to solve such problems of the choice of cutting mode that provide vibration-free machining. The developed mathematical model takes into account the closed of the cutting process and machining "on the trail", which is implemented in its structural diagram representing the process, feedbacks and a function of a delay argument. The dynamic model of a technological machining system is represented by a single-mass model with two degrees of freedom. The developed block diagram of the system together with numerical algorithms for solving the geometric intersection of the cutter tooth with the workpiece and the numerical method of integrating differential equations form the basis of the created application program for digital modeling of the process. The simulation results indicate an adequate response of the program as a whole, which allows us to take the proposed methodology as the basis for further improvement of the virtual research process and the prediction of its real properties. Key words: Cylindrical milling, end mill, digital simulation.

scholarly journals Parking Provision for CBD Area of Pabna Town in Bangladesh

2017 ◽  
Vol 2 (9) ◽  
pp. 27 ◽  
Author(s):  
Atikur Rahman ◽  
Jakirul Islam Jony Prothan ◽  
Marazul Islam ◽  
Ashrafuzzaman Pramanik
Keyword(s):  
Vacant Land ◽  
Parking Space ◽  
Actual Measurement ◽  
Demand And Supply ◽  
Traffic Lane ◽  
Parking Problem ◽  
Ancient City ◽  
Parking System ◽  
Inventory Survey ◽  
Parking Demand

Pabna is the most ancient city of Bangladesh having a parking problem in CBD area. This study is mainly focused on the demand and supply of parking system in CBD area. The deficiency of parking supply and illegal occupancy of the traffic lane with parking has become a common practice. An existing parking accommodation, parking demand, parking turnover, average parking duration, parking types and parking index are analyzed on the base of modified patrol survey. The parking space inventory survey helps to identify the present parking spaces, number of parking bays, vacant land for the multistoried parking facility. Both on-street and off-street parking have surveyed to find out the actual measurement of the demand and supply of parking. It should be mentioned that the feasibility of a multistoried parking facility is also proposed to shift the existing on-street parking of CBD.

Coordinated Visual and Kinematic Servoing for Positioning Manipulating UAV End-Effectors

2014 ◽  
Author(s):  
Todd W. Danko ◽  
Paul Y. Oh
Keyword(s):  
Disaster Response ◽  
Degrees Of Freedom ◽  
Joint Space ◽  
Degree Of Freedom ◽  
Ground Vehicles ◽  
Manipulator Arm ◽  
One Step ◽  
Infrastructure Repair ◽  
End Effectors ◽  
Six Degree Of Freedom

Manipulating objects using arms mounted to unmanned aerial vehicles (UAVs) is attractive because UAVs may access many locations that are otherwise inaccessible to traditional mobile manipulation platforms such as ground vehicles. However, the constantly moving UAV platform and compliance of manipulator arms make it difficult to position the UAV and end-effector relative to an object of interest precisely enough for reliable manipulation. Solving this challenge will bring UAVs one step closer to being able to perform meaningful tasks such as infrastructure repair, disaster response, law enforcement, and personal assistance. Toward a solution to this challenge, this paper describes an approach to coordinate the redundant degrees of freedom of a six degree of freedom gantry with those of a six degree of freedom manipulator arm. The manipulator’s degrees of freedom are visually servoed to a specified pose relative to a target while treating motions of the host platform as perturbations. Simultaneously, the host platform’s degrees of freedom are servoed using kinematic information from the manipulator. This drives the base of the manipulator to a position that allows it to assume a joint-space configuration that maximizes reachability while minimizing static torque transmitted from the arm to the host.

Robust Trajectory Following Control of Robotic Systems

1985 ◽  
Vol 107 (4) ◽  
pp. 308-315 ◽  
Author(s):  
S. N. Singh ◽  
A. A. Schy
Keyword(s):  
Degrees Of Freedom ◽  
Digital Simulation ◽  
Robotic Systems ◽  
Control Law ◽  
Robot Arm ◽  
Control Laws ◽  
Payload Uncertainty ◽  
Trajectory Following ◽  
And Control ◽  
Three Degrees Of Freedom

Using an inversion approach we derive a control law for trajectory following of robotic systems. A servocompensator is used around the inner decoupled loop for robustness to uncertainty in the system. These results are applied to trajectory control of a three-degrees-of-freedom robot arm and control laws Cθ and CH for joint angle and position trajectory following, respectively, are derived. Digital simulation results are presented to show the rapid trajectory following capability of the controller in spite of payload uncertainty.

scholarly journals Path-following enhancement of an 8×8 combat vehicle using active rear axles steering strategies

2021 ◽  
pp. 146441932110364
Author(s):  
Moataz Ahmed ◽  
Moustafa El-Gindy ◽  
Haoxiang Lang
Keyword(s):  
Autonomous Vehicles ◽  
Degrees Of Freedom ◽  
Research Work ◽  
Path Following ◽  
Frequency Domain Analysis ◽  
Lateral Stability ◽  
Ground Vehicles ◽  
Combat Vehicle ◽  
All Wheel Steering ◽  
And Performance

Active rear steering has been used in many research work to enhance ground vehicles’ lateral stability. However, there is a shortage in the published research studies that consider the incorporation of active rear steering for autonomous vehicles applications, especially in case of multi-axle combat vehicles. In this paper, various H[Formula: see text] controllers are developed to actively steer rear axles of a multi-axle combat vehicle using a linearized bicycle model. The proposed controllers are incorporated with a 22 degrees of Freedom nonlinear Trucksim full vehicle model to study and compare the developed controllers’ performance on a hard surface. Moreover, a frequency-domain analysis is conducted to investigate the influence of the active rear steering on the path-following controllers’ robustness in terms of stability and performance. Three path-following controllers are designed, where the first controller is applied on the front two axles of the vehicle, while the rear two axles are fixed. The second is applied to all-wheel steering vehicle. The third controller is an integration between the designed front steering path-following controller and a developed lateral stability active rear steering controller. Eventually, a series of virtual maneuvers are performed to evaluate the effectiveness of the intended controllers to present the advantages and limitations of each controller at different driving conditions.

Development of a Simplified Three Degrees of Freedom Model to Represent the Installation of a Subsea Manifold

2021 ◽  
Author(s):  
Filipe Salvador Lopes ◽  
Joel Sena Sales Junior ◽  
Emerson Martins de Andrade ◽  
Antonio Carlos Fernandes
Keyword(s):  
Degrees Of Freedom ◽  
Numerical Models ◽  
Vertical Plane ◽  
Wave Forces ◽  
Real Problem ◽  
Short Period ◽  
Long Time ◽  
Python Programming ◽  
Operating Window ◽  
Three Degrees Of Freedom

Abstract Due to risks involved during the installation of subsea equipment, it is necessary to simulate the installation process to determine a safe operating window. However, most of the software capable of running these kinds of simulations are very expensive, and these simulations usually take a long time to be made. It is then very convenient to develop a simplified model, capable of running these analyses in a short period of time while still providing us with reliable results. This model was developed using the Python programming language, where a fourth-order Runge Kutta method was implemented to solve the equation of motions that governs the manifold’s installation process. The assumptions are that the wave forces are applied to the ship executing the manifold installation. The ship’s motions were applied at the top of the cable, connected to the crane, so the manifold motions underwater and the cable tension could be calculated. Previously, a simplified one-degree of freedom (1DoF) model was developed and compared to other numerical models and experimental data. In this present work, the model was then expanded to motions in a vertical plane, that is, three degrees of freedom (3 DoF), in order to better represent the physics of the real problem. Its results were then compared to the ones obtained by the 1 DoF model and to the experimental results. The 3 DoF model resulted in a dynamic response closer to the ones observed in the experiments, which shows that it is a better representation of the problem.

Food Allergy

PEDIATRICS ◽  
1951 ◽  
Vol 8 (1) ◽  
pp. 159-160
Keyword(s):  
Food Allergy ◽  
Dynamic Mechanism ◽  
Practical Approach ◽  
Short Period ◽  
Close Study

This, in the words of the authors, is a monograph describing the nature and dynamic mechanism of food allergy, and an outline of a practical approach to the problems inherent in its recognition and management. Food allergy is described as cyclic or fixed. A cyclic food allergy may go through the phases of masked sensitization, omission, hyperacute sensitization, active sensitization, latent sensitization and tolerance. Without a close study of their actual work it is impossible to assess this, but the authors have positively and accurately described their position in food allergy in such a manner that any debatable points can be readily proved or disproved, and undoubtedly this will be done within a short period.

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