Homogenized Models of Suspension Dynamics

2021 ◽  
Author(s):  
Evgen Ya. Khruslov
Keyword(s):  
Suspension Dynamics

Laboratory Tire Wear Simulation Derived from Computer Modeling of Suspension Dynamics

1991 ◽  
Vol 19 (3) ◽  
pp. 122-141 ◽  
Author(s):  
C. Wright ◽  
G. L. Pritchett ◽  
R. J. Kuster ◽  
J. D. Avouris
Keyword(s):  
Computer Modeling ◽  
Computer Model ◽  
Normal Load ◽  
Operating Environment ◽  
Design Features ◽  
Handling Characteristics ◽  
Tire Wear ◽  
Suspension Dynamics ◽  
Instrumented Vehicle ◽  
Vehicle Testing

Abstract A method for determining the effect of suspension dynamics on tire wear has been developed. Typical city cycle maneuvers are defined by instrumented vehicle testing and data in the form of forward velocities and steer angles are used as an input to an ADAMS computer model of the vehicle. A simulation of the maneuvers generates a tire's operating environment in the form of normal load, slip, and camber variations, which contain all the subtle effects of the vehicle's suspension, steering, and handling characteristics. A cyclic repetition of the tire's operating environment is constructed and used to control an MTS Flat-Trac machine. In this way, accelerated tire wear can be generated in the laboratory which is directly related to the design features of the vehicle's suspension and steering systems.

scholarly journals Suspension dynamics in transitional pipe flow

2021 ◽  
Vol 6 (6) ◽  
Author(s):  
Willian Hogendoorn ◽  
Bidhan Chandra ◽  
Christian Poelma
Keyword(s):  
Pipe Flow ◽  
Suspension Dynamics

A quarter-car suspension model for dynamic evaluations of an in-wheel electric vehicle

2017 ◽  
Vol 232 (9) ◽  
pp. 1139-1148 ◽  
Author(s):  
Ambarish Kulkarni ◽  
Sagheer A Ranjha ◽  
Ajay Kapoor
Keyword(s):  
Ride Comfort ◽  
Combustion Engine ◽  
Permanent Magnet Motor ◽  
Plot Analysis ◽  
Car Suspension ◽  
Switch Reluctance Motor ◽  
Suspension Dynamics ◽  
Quarter Car ◽  
Derived Design ◽  
Suspension Model

Electric vehicles (EVs) are an alternative architecture in the automotive industry that provide reduced emissions. This research has developed a switch reluctance motor (SRM) in-wheel drivetrain for an EV. SRM drivetrains are cheaper and do not use rare earth elements unlike a permanent magnet motor (PMM). Conversely, the in-wheel SRM has a drawback of an increased mass on the suspension when compared with an equivalent power output PMM drivetrain. This situation results in an increased mass at the wheels; hence, a suspension analysis is required. This paper discusses the suspension dynamics evaluated using a quarter-car simulation of an in-wheel SRM EV and compares it to the internal combustion engine (ICE) vehicle. The simulation used step loads derived design scenarios, namely (1) sprung, (2) unsprung and (3) driver’s seat. Further Bode plot analysis techniques were used to determine the ride comfort range for the developed EV.

Numerical Simulations of Slider Interaction With Multiple Asperity Using Hertzian Contact Model

1995 ◽  
Vol 117 (4) ◽  
pp. 575-579 ◽  
Author(s):  
Ellis Cha ◽  
D. B. Bogy
Keyword(s):  
Disk Drive ◽  
Contact Model ◽  
Hertzian Contact ◽  
Flying Height ◽  
Radius Of Curvature ◽  
Asperity Contact ◽  
Disk Contact ◽  
Suspension Dynamics ◽  
Magnetic Hard Disk ◽  
Hertzian Contact Model

A numerical simulation of slider-disk contact in a magnetic hard disk drive is studied using the Hertzian contact model. The slider-disk contact is caused by flying height fluctuation due to disk runout for very low flying sliders. The rough disk topography is generated numerically by combining a sinusoidal waviness and a Gaussian roughness. For each asperity contact, the radius of curvature is calculated from the disk topography, and the radius is used to calculate the contact force using the Hertzian contact model. The slider’s response to a single asperity calculated using the Hertzian contact model agrees well with the result obtained using the impulse-momentum based contact model. The simulation results of slider-disk contact including suspension dynamics are calculated with and without friction for a “nano-slider.”

Dynamic Load Augment From Steam Locomotives

2016 ◽  
Author(s):  
Gary Fairbanks ◽  
Harold Weisinger ◽  
Steven Zuiderveen ◽  
Anand Prabhakaran ◽  
Tanner Buel
Keyword(s):  
Rolling Stock ◽  
Lateral Loads ◽  
Railroad Track ◽  
Wheel Load ◽  
Railroad Bridges ◽  
Suspension Dynamics ◽  
Design Values ◽  
Railway Engineering ◽  
Truss Bridge ◽  
The Impact

Railroad bridges experience dynamic wheel load augment from rolling stock that cross the bridges, due to nominal bridge and suspension dynamics, as well as anomalies such as wheel flats. The level of dynamic augment is particularly high for steam locomotives due to the hammer blow effect associated with the driven wheels. Tests conducted in the early-mid 20th century had quantified some of these effects, and the resulting findings have been part of the impact formulae presented in the AREMA Railway Engineering Manual. However, there was concern that the impact associated with some of the non-cross counter-balanced, lighter, older locomotives, could be higher than specified by AREMA formulae. This paper describes the methodology and results from a series of tests that evaluated the levels of dynamic augment experienced by railroad track and an exemplar bridge under a set of narrow gauge steam locomotives, and compares the measurements to the design values specified in the AREMA Manual. Vertical and lateral loads on railroad track, and strain levels on multiple critical bridge members were measured under three different classes of light, narrow gauge steam locomotives, over a range of operating speeds and conditions. The tests were conducted on a 120 ft span, through truss bridge, and adjacent track on a tourist railroad. Dynamic augment values measured during the tests were generally lower than the values expected from AREMA formulae. Similarly, the peak lateral loads measured appear to be nominal and lower than the AREMA prescribed values. However, it should be kept in mind that these results are from tests conducted with three relatively light, narrow gauge locomotives, on specific bridge and track, whereas, the AREMA formulae are intended to cover a wider range of conditions. These tests tend to show that the legacy standards are conservative and are applicable to calculating regulatory required bridge loads where steam locomotives are concerned.

scholarly journals The method of kinematic excitation reconstruction based on measured suspension dynamic responses – experimental verification

2021 ◽  
Vol 1199 (1) ◽  
pp. 012083
Author(s):  
Zbyszko Klockiewicz ◽  
Grzegorz Ślaski ◽  
Hubert Pikosz
Keyword(s):  
Control System ◽  
Experimental Verification ◽  
Tracking Control ◽  
Pid Controller ◽  
Dynamic Responses ◽  
Kinematic Excitation ◽  
Road Profile ◽  
Suspension Dynamics ◽  
Road Excitation ◽  
Unsprung Mass

Abstract The paper presents the method of kinematic road excitation reconstruction based on measured suspension dynamic responses and its reconstruction with use of estimated displacements of unsprung mass as a preliminary approximation of kinematic excitation and tracking control system with a PID controller that allows for faithful reconstruction of unsprung mass accelerations and, in turn, kinematic excitations. The authors performed an experimental verification of the method with use of one axle car trailer and measurements of road profile and acquiring signals of suspension dynamics responses. The signal processing methodology and obtained results are presented for random and determined excitations. The necessary requirements to use the method effectively were defined and its limitations were listed.

scholarly journals Generation of acoustic-Brownian noise in nuclear magnetic resonance under non-equilibrium thermal fluctuations

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Dhiraj Sinha
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Magnetic Moments ◽  
Thermal Fluctuations ◽  
Johnson Noise ◽  
Brownian Noise ◽  
Suspension Dynamics ◽  
Enhancement Algorithm ◽  
Non Equilibrium ◽  
Nuclear Magnetic

AbstractWe present an analytical study on generation of acoustic-Brownian noise in nuclear magnetic resonance (NMR) induced as a result of thermal fluctuations of the magnetic moments under non-equilibrium thermal interactions which has not been explored independent of Nyquist–Johnson noise until now. The mechanism of physical coupling between non-equilibrium thermal fluctuations and magnetic moments is illustrated using Lighthill’s formulation on suspension dynamics. We discover that unlike Nyquist–Johnson noise which has a uniform spectral density across a range of frequencies, the spectral dependence of acoustic-Brownian noise decreases with an increase in frequency and resembles Brownian noise associated with a particle in a potential well. The results have applications in the field of image enhancement algorithm as well as noise reduction instrumentation in NMR systems.

Suspension Dynamics in an Optical Field

2019 ◽  
Vol 27 (4) ◽  
pp. 278-280
Author(s):  
A. F. Bunkin ◽  
V. G. Mikhalevich ◽  
S. M. Pershin ◽  
V. N. Streltsov
Keyword(s):  
Optical Field ◽  
Suspension Dynamics
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