scholarly journals Concept of high mobility wheelchair with hydrostatic drive system

2018 ◽  
Vol 19 (6) ◽  
pp. 827-830
Author(s):  
Karol Cieślik ◽  
Marian Janusz Łopatka ◽  
Arkadiusz Rubiec ◽  
Kacper Spadło
Keyword(s):  
Dynamic Model ◽  
High Mobility ◽  
Suspension System ◽  
Drive System ◽  
Strength Analysis ◽  
Turning System ◽  
Innovative Concept

The article presents the concept of a high mobility wheelchair with a hydrostatic drive system .It presents existing solutions of manually driven wheelchair and external powered solutions. It was proposed original drive system, suspension system and turning system unheard in wheelchairs. It was analyzed the distribution of required components. On this basis there was created dynamic model. It was subjected to tests determining the driver's comfort and the load on the structure. The strength analysis of the proposed structure was carried out. As the result, it was created an innovative concept of the high mobility wheelchair capable to moving everywhere where other people can do.

The Spherical Rolling-Flying Vehicle: Dynamic Modeling and Control System Design

2021 ◽  
pp. 1-23
Author(s):  
Stefan Atay ◽  
Matthew Bryant ◽  
Gregory D. Buckner
Keyword(s):  
Control System ◽  
Dynamic Model ◽  
Dynamic Modeling ◽  
Trajectory Tracking ◽  
Tracking Control ◽  
High Mobility ◽  
Theoretical Development ◽  
Trajectory Tracking Control ◽  
Modeling And Control ◽  
And Control

Abstract This paper presents the dynamic modeling and control of a bi-modal, multirotor vehicle that is capable of omnidirectional terrestrial rolling and multirotor flight. It focuses on the theoretical development of a terrestrial dynamic model and control systems, with experimental validation. The vehicle under consideration may roll along the ground to conserve power and extend endurance but may also fly to provide high mobility and maneuverability when necessary. The vehicle employs a three-axis gimbal system that decouples the rotor orientation from the vehicle's terrestrial rolling motion. A dynamic model of the vehicle's terrestrial motion is derived from first principles. The dynamic model becomes the basis for a nonlinear trajectory tracking control system suited to the architecture of the vehicle. The vehicle is over-actuated while rolling, and the additional degrees of actuation can be used to accomplish auxiliary objectives, such as power optimization and gimbal lock avoidance. Experiments with a hardware vehicle demonstrate the efficacy of the trajectory tracking control system.

Design and Optimization of Intelligent Service Robot Suspension System Using Dynamic Model

2010 ◽  
Vol 34 (8) ◽  
pp. 1023-1028
Author(s):  
Seong-Hoon Choi ◽  
Tae-Won Park ◽  
Soo-Ho Lee ◽  
Sung-Pil Jung ◽  
Kab-Jin Jun ◽  
...  
Keyword(s):  
Dynamic Model ◽  
Suspension System ◽  
Service Robot ◽  
Design And Optimization

A Research of Vibration Signal Processing of Air Suspension System

2012 ◽  
Vol 472-475 ◽  
pp. 666-669
Author(s):  
Bin Yang ◽  
Jing Wen Wang
Keyword(s):  
Signal Processing ◽  
Dynamic Model ◽  
Dynamic Load ◽  
Vibration Signal ◽  
Noise Signal ◽  
Suspension System ◽  
Load Curve ◽  
Acceleration Signal ◽  
System A ◽  
Air Suspension

Wavelet transform was utilized in vibrant signal processing of air suspension system. A dynamic model of 1/4 engineering vehicle with air suspension system was established. Road surface signal of B grade was input to the dynamic model. Vibrant acceleration curve of under spring mass and dynamic load curve of air suspension was gained. Noise signal of under spring mass acceleration and dynamic load of air suspension system were filtrated by wavelet decomposition. Vibrant acceleration signal of under spring mass and dynamic load signal of air suspension were extracted by wavelet reconstruction. It can provide a theoretical foundation for identifying dynamic load of air suspension system.

scholarly journals Influence of Stacking Sequence on Strength and Stability of Suspension System Control arm CFRP Laminate Rods

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5849
Author(s):  
Paula Mierzejewska ◽  
Jacek Świniarski ◽  
Tomasz Kubiak
Keyword(s):  
Suspension System ◽  
Strength Analysis ◽  
System Control ◽  
Cfrp Laminate ◽  
Layer Arrangement ◽  
Technology Students ◽  
University Of Technology ◽  
Carbon Fibre Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Strength And Stiffness

The paper deals with buckling and strength analysis of suspension system rods made of carbon fibre reinforced polymer (CFRP) laminate. The whole suspension system of urban solar vehicle, Eagle Two, designed by Lodz University of Technology students was considered. The calculations and analysis focused on suspension rods, where the traditional metal material was replaced with CFRP laminate. The influence of layer arrangement on rod strength, static, and dynamic buckling were analysed. The research was conducted using numerical simulations employing finite element method software. The static and dynamic load was considered. The obtained results show that the plies’ order in the laminate influences both the strength and stiffness of the considered rod. The best results considering both failure force and longitudinal elasticity modulus were obtained for the stacking sequences with axially oriented (0°) plies on the outside of the rod.

Dynamic analysis and vibration reduction of mechanical-hydraulic coupled tunnel boring machine (TBM) main drive system

2021 ◽  
pp. 095440622110293
Author(s):  
Zhange Zhang ◽  
Wenbo Ji ◽  
Bowen Yang ◽  
Junzhou Huo ◽  
Xuanxuan Li
Keyword(s):  
Dynamic Model ◽  
Working Conditions ◽  
Vibration Reduction ◽  
Tunnel Boring Machine ◽  
Drive System ◽  
Damping Coefficient ◽  
Main Beam ◽  
Tunnel Boring ◽  
Axial Acceleration ◽  
Main Drive System

Tunnel Boring Machine always works in the changeable geologies with multiple drivers, which leads to severe vibration of the TBM main drive system and key component failures. The vibration characteristics of TBM under different working conditions and the vibration reduction analysis have important meanings. First of all, by considering the time-varying random loads of the cutters, the contact force of the gears, the stiffness of the main bearing, and the stiffness of the cylinders, a mechanical-hydraulic coupling nonlinear dynamic model of the TBM main drive system was built according to the assembly relationship and load transmission path of the main drive system. Secondly, the dynamic model of the TBM main drive system is verified by comparing the theoretical vibration with the real vibration of the TBM main drive system. The error of the vibration acceleration is 10% to 30%. Three typical loads are defined under typical working conditions, and the vibrations of the TBM main drive system under three typical loads were analyzed. Finally, the sensitivity analysis of the cylinder damping shows that the damping at the position of the propulsion cylinder has a great influence on the vibration of the TBM main drive system. The results show that when the damping coefficient is 2.5 × 106 N·s/m, the maximum reduction of axial acceleration of cutterhead is 0.64 g, and that of the main beam front section is 0.55 g. The variable damping coefficient vibration reduction strategies under three typical loads are verified.

Control Strategy of the Dual Motors Coupling Propulsion for Battery Electric Buses

2014 ◽  
Vol 528 ◽  
pp. 364-370 ◽  
Author(s):  
Guang Wei Han ◽  
Cheng Ning Zhang ◽  
Shuo Zhang ◽  
Xiao Hua Wu
Keyword(s):  
Dynamic Model ◽  
Control Strategy ◽  
Control Method ◽  
Coordinated Control ◽  
Drive System ◽  
Simulation Platform ◽  
City Bus ◽  
Working Principle ◽  
Simulation Results

A novel drive system the Dual Motors Coupling Propulsion (DMCP) for battery electric buses was proposed, and its structure and working principle were introduced. For the power and comfort performance of the vehicle, the control method of the motors and the coordinated control strategy of the DMCP were developed. The co-simulation platform of AMESim and Simulink was established, based on which the dynamic model of the vehicle equipped the DMCP was built. The simulation results show that the DMCP runs smoothly in the Chinese typical city bus driving schedule. This indicates that the control strategy can manipulate the DMCP to drive the bus powerfully and smoothly. This has laid the foundation of the further research of the DMCP.

scholarly journals SOME FEATURES OF MILLS OPERATION COLD PILER PIPE ROLLING

2018 ◽  
pp. 30-35
Author(s):  
S.R. Rakhmanov
Keyword(s):  
Differential Equation ◽  
Mechanical System ◽  
Dynamic Model ◽  
Dynamic Instability ◽  
Power Line ◽  
Drive System ◽  
Design Stage ◽  
Dynamic Features ◽  
Pipe Rolling ◽  
Parametric Oscillations

Purpose. The establishment of the essence of many dynamic phenomena and the prediction of peak loads, both during the design or reconstruction stages of HPT mills and their operation using advanced calculation methods remain relevant. Methodology. An engineering technique to simplify a developed dynamic model is proposed, which includes the combination and development of known techniques. In addition, active mechanical connections in the original dynamic model of an HPT mill are identified, causing the pronounced parametric processes in the system under study. Findings. The study of the dynamics of simplified two-mass models of the HPT mill with combined parameters and periodically changing mass characteristics has been carried out. A differential equation of parametric oscillations in the drive power line has been compiled. The solution to the differential equation allows us to estimate the dynamic displacements of the considered drive of the working stand of the HPT mill for the most common modes of vibration of the mechanical system. Since the differential equations (8) are present in the formulation of the basic Cauchy problem, we implement the solution numerically, using the Runge - Kut method in the medium of a standard software product, for the most common first form of oscillations of a mechanical system. Originality. Dynamic features of the operation of the drive of the working stand of the HPT mill are presented in the form of angular displacements of the drive shaft of the mechanical system. The dynamics of the drive drive of the working stand of the HPT, 32-3 mill are calculated (pipe rolling along the route 38×3.8 → 19.1×2.1, material – steel Х18Н10Т). Practical value. The causes of the appearance of parametric oscillations in the drive system are identified and dynamic instability zones of the mechanical drive system of the HPT mill is installed, which allows for the selection of optimal rolling conditions at the design stage of technological processes. Keywords: cold rolling, pipe, mill, power line, main drive, dynamic model, simplified design scheme, mathematical model, parametric oscillations, differential equation, angular oscillations, dynamic instability.

scholarly journals Kinematic Discrepancy of Hydrostatic Drive of Unmanned Ground Vehicle

2015 ◽  
Vol 62 (4) ◽  
pp. 413-427 ◽  
Author(s):  
Stanisław Konopka ◽  
Marian Janusz Łopatka ◽  
Mirosław Przybysz
Keyword(s):  
High Mobility ◽  
Drive System ◽  
Theoretical Discussion ◽  
Unmanned Ground Vehicle ◽  
Static Characteristics ◽  
Ground Vehicle ◽  
Drive Systems

Abstract The study presents the issue of kinematic discrepancy of hydrostatic drive systems of high mobility vehicles, and its impact on the presence of the unfavourable phenomenon of circulating power. Furthermore, it presents a theoretical discussion concerning the capacity of the compensation of kinematic discrepancy by a hydrostatic drive system on the basis of tests using static characteristics.

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