scholarly journals PARAMETERS FOR MODELING PASSIVE SUSPENSIONS OF SPRAY BARS

2021 ◽  
Vol 41 (3) ◽  
pp. 368-378
Author(s):  
Rafael Kappaun ◽  
Agenor D. de Meira Junior ◽  
Márcio Walber
Keyword(s):  
Passive Suspensions

scholarly journals Passive suspensions for ride quality improvement of two-axle railway vehicles

2013 ◽  
Vol 229 (3) ◽  
pp. 315-329 ◽  
Author(s):  
Jason Zheng Jiang ◽  
Alejandra Z Matamoros-Sanchez ◽  
Argyrios Zolotas ◽  
Roger M Goodall ◽  
Malcolm C Smith
Keyword(s):  
Quality Improvement ◽  
Ride Quality ◽  
Railway Vehicles ◽  
Passive Suspensions

scholarly journals Effective viscosity of puller-like microswimmers: a renormalization approach

2013 ◽  
Vol 10 (89) ◽  
pp. 20130720 ◽  
Author(s):  
Simon Gluzman ◽  
Dmitry A. Karpeev ◽  
Leonid V. Berlyand
Keyword(s):  
Renormalization Group ◽  
Critical Point ◽  
Effective Viscosity ◽  
Collective Motion ◽  
Analytical Determination ◽  
Renormalization Approach ◽  
Theoretical Results ◽  
Better Than ◽  
Passive Suspensions

Effective viscosity (EV) of suspensions of puller-like microswimmers (pullers), for example Chlamydamonas algae, is difficult to measure or simulate for all swimmer concentrations. Although there are good reasons to expect that the EV of pullers is similar to that of passive suspensions, analytical determination of the passive EV for all concentrations remains unsatisfactory. At the same time, the EV of bacterial suspensions is closely linked to collective motion in these systems and is biologically significant. We develop an approach for determining analytical EV estimates at all concentrations for suspensions of pullers as well as for passive suspensions. The proposed methods are based on the ideas of renormalization group (RG) theory and construct the EV formula based on the known asymptotics for small concentrations and near the critical point (i.e. approaching dense packing). For passive suspensions, the method is verified by comparison against known theoretical results. We find that the method performs much better than an earlier RG-based technique. For pullers, the validation is done by comparing them to experiments conducted on Chlamydamonas suspensions.

Analysis of Semi-Active and Passive Suspensions System for Off-Road Vehicles

2009 ◽  
Author(s):  
Zohir BenLahcene ◽  
Waleed F. Faris ◽  
M. D. Raisuddin Khan ◽  
Lotfi Beji ◽  
Samir Otmane ◽  
...  
Keyword(s):  
Road Vehicles ◽  
Passive Suspensions

Passive suspensions incorporating inerters for railway vehicles

2012 ◽  
Vol 50 (sup1) ◽  
pp. 263-276 ◽  
Author(s):  
Jason Zheng Jiang ◽  
Alejandra Z. Matamoros-Sanchez ◽  
Roger M. Goodall ◽  
Malcolm C. Smith
Keyword(s):  
Railway Vehicles ◽  
Passive Suspensions

Pneumatic Actuators for Vehicle Active Suspension Applications

1985 ◽  
Vol 107 (1) ◽  
pp. 67-72 ◽  
Author(s):  
D. Cho ◽  
J. K. Hedrick
Keyword(s):  
Vehicle Dynamics ◽  
Peak Flow ◽  
Active Suspension ◽  
Lateral Acceleration ◽  
Passenger Cars ◽  
Power Requirement ◽  
Pneumatic Actuators ◽  
Pneumatic Cylinders ◽  
Passive Suspensions

The use of actively controlled pneumatic actuators in parallel with conventional passive suspensions to improve vehicle dynamics was investigated. For application on the secondary lateral suspension of AMTRACK passenger cars, it is shown that using 4 in. (10.16 cm) bore pneumatic cylinders with a valve which has a peak flow capability of 40 SCFM (1130 1/min) at 130 psi (896 KPa) can reduce the rms carbody lateral acceleration by 46 percent and the rms secondary lateral suspension stroke by 34 percent with a power requirement of 7.6 hp (5.7 kw) per car.

Improved Off-Road Tractor Ride via Passive Cab and Seat Suspensions

1984 ◽  
Vol 106 (2) ◽  
pp. 305-313 ◽  
Author(s):  
S. Rakheja ◽  
S. Sankar
Keyword(s):  
Low Frequency ◽  
Relative Displacement ◽  
Road Vehicle ◽  
Seat Suspension ◽  
Suspension Parameters ◽  
Cab Suspension ◽  
Agricultural Tractor ◽  
Translational Acceleration ◽  
Passive Suspensions ◽  
Three Phases

Low frequency terrain-induced vibrations transmitted to off-road vehicle operators are quite severe and exceed ISO specified “fatigue-decreased-proficiency” (FDP) limits. Ride improvement of an agricultural tractor is investigated via passive suspensions at the seat and/or cab for their relatively simpler adaptability to an existing tractor construction. The investigation has been carried out in three phases, namely: seat suspension incorporating bounce, longitudinal, lateral, roll, and pitch modes on a rigidly mounted cab; cab suspension with a rigidly mounted seat; seat suspension in bounce, bounce-lateral, and bounce-roll, mounted on a suspended cab. Optimum suspension parameters in each phase of study are selected to maintain all translational acceleration PSDs at the operator’s location within 4 hours’ exposure-FDP limits, and to minimize roll and pitch acceleration PSD response. The relative displacement in each case is constrained to a selected minimum. Ride improvement achieved during each phase of investigation is compared to ISO-FDP acceleration PSD limits, and conclusions are drawn. Contribution of factors such as seat-location and cab-geometry to ride improvement is also presented.

Ride comfort control of in-wheel motor drive unmanned ground vehicles with energy regeneration

2020 ◽  
pp. 095440702093336
Author(s):  
Lipeng Zhang ◽  
Chenhui Ren ◽  
Xinmao Yuan ◽  
Wei Zhang
Keyword(s):  
Ride Comfort ◽  
Control Method ◽  
The Body ◽  
Vibration Energy ◽  
Motor Drive ◽  
Optimal Control Strategy ◽  
Body Acceleration ◽  
Control Functions ◽  
Save Energy ◽  
Passive Suspensions

Adopting in-wheel motor drive can improve vehicle dynamics control functions, which is the most ideal drive mode of unmanned ground vehicle. However, with the increase of the heavy unspring-mass vibration energy while the vehicle running on uneven road, the ride comfort will be seriously deteriorated. To solve the problem and save energy, the ride comfort control based on regenerative suspensions is adopted. By analyzing the vibration performance, the adverse effects of the vehicle equipped in-wheel motors with passive suspensions are revealed. Then, the dynamics model of the regenerative suspension is built. Based on the suspension power recovery, the multi-state optimal control strategy for improving the ride comfort is designed. Finally, comparing the simulation results of regenerative suspensions with the test results of passive suspensions, when the vehicle mass ratio decreases from 8:1 to 4:1, the body acceleration and the root mean square value of tire dynamic load increase by 28.1% and 31.6%, correspondingly. With the control method, the body acceleration is decreased by 23% and reaches the level of conventional vehicles. Furthermore, part of the vehicle vibration energy can be recovered and the vehicle driving range can be extended.

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