Ride comfort simulation of a wheel loader with suspended axles

Rehnberg, Adam; Drugge, Lars

doi:10.1504/ijvsmt.2008.023836

Cited by 28 publications

(20 citation statements)

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“…In [8], the dynamic behaviors of wheel loaders with different layouts of hydropneumatic suspensions are investigated, and the research results show that the axle suspensions can help the body vertical acceleration to be reduced. In [9], a wheel loader with and without axle suspensions is modeled using multibody system dynamics, and the effect of introducing axle suspension on wheel loader ride comfort is also investigated.…”

Section: Introductionmentioning

confidence: 99%

Damping Multimode Switching Control of Semiactive Suspension for Vibration Reduction in a Wheel Loader

Wei

Liu

2019

Shock and Vibration

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The aim of this work is the control design and analysis of a semiactive axle suspension system for vibration reduction in a wheel loader. Unlike a traditional semiactive suspension system with continuously adjustable shock absorber, in this work, a novel axle suspension with multiple damping modes is proposed for the wheel loader. The multimode switching damping characteristics are achieved by just changing the discrete statuses of two high-speed switch electromagnetic valves, which makes the damping adjustment simpler and more reliable. However, because of the existence of discrete events, i.e., the on-off statuses of switch electromagnetic valves, the axle suspension proposed for the wheel loader poses a challenging hybrid control problem. To solve this problem, the mixed logical dynamical (MLD) modeling approach for hybrid systems is applied to model the dynamic characteristics of the system damping control procedure. Using this model, a hybrid model predictive control (HMPC) strategy is further designed, which can determine the optimal switching sequences of the discrete damping modes according to the axle suspension performance indices. Finally, to verify the effectiveness of the proposed semiactive axle suspension with multiple damping modes and its control approach, simulation analyses are conducted.

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Section: Introductionmentioning

confidence: 99%

Damping Multimode Switching Control of Semiactive Suspension for Vibration Reduction in a Wheel Loader

Wei

Liu

2019

Shock and Vibration

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“…With this automatic simulation process, axle and cab suspensions on the wheel loader can be optimized for more riding comfort and operational safety. Other researchers, through help of multi-body models of a wheel loader with suspended axles or unsuspended axles, investigated that WBV in the vertical and the longitudinal directions on the wheel loader was reduced greatly by suspended axles [22]. It's important to highlight that than the education of the drivers has a relevant role in order to prevent the negative effects.…”

Section: Introductionmentioning

confidence: 99%

Safety-Oriented Multi-Task Approach to Manage Whole-Body Vibration Exposure Among Quarry Operators

Degan

Antonucci

Coltrinari

et al. 2019

WIT Transactions on the Built Environment

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The oscillation generated by external and internal forces is one of the principal characteristics of machinery. The impulses are transmitted to workers' bodies through the part in contact with the vibrational surface, such as the steering wheel of a machine (known as "hand arm vibration" (HAV)), contact surface or the driver's seat of a machine (known as "whole-body vibration" (WBV)). These represent an occupational issue that can generate adverse health effects, annoyance or simple discomfort for the workers during their daily activities. Biodynamic responses of the human body to WBV are reported in terms of the driving point mechanical impedance and apparent mass, transmissibility and the power absorbed by the body. The most common WBV occupational exposure is represented by the operator seated in a variety of vehicle categories such as cars, buses, forklifts, tractors, trucks, and heavy machinery either on or off paved roads in different work contexts. Previous studies investigated the power absorbed by the human body during daily exposure and the consequent potential negative effects on the human health. They evidenced that health effects are connected to the intensity of the vibration levels. In order to reduce workers' exposure, an efficient method could consist of analysing the power frequency spectrum. In fact it provides relevant indications in order to adopt the correct preventative or corrective measurements such as specific suspended seats, extra breaks and individual work schedules. This study is aimed at assessing the WBV exposure among drivers of machinery in a quarrying context thus proving a useful tool to manage such a risk in terms of work organization and scheduling.

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“…2,3 Active control of the hydropneumatic suspension mounted on the wheel loader not only improves the ride comfort and steering stability, but also adjusts the height of the vehicle to improve the vehicle's travelability. 4 Rehnberg and Drugge 5 developed the virtual multibody models of a wheel loader with and without axle suspensions to investigate the effect of introducing axle suspension on vehicle ride performance. The simulation results revealed approximately 50% reduction in the longitudinal and vertical accelerations through front and rear axle suspensions.…”

Section: Introductionmentioning

confidence: 99%

Active control of hydropneumatic suspension parameters of wheel loaders based on road condition identification

Wang

Liu

et al. 2018

International Journal of Advanced Robotic Systems

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Wheel loader is off-road vehicle and works on uneven terrain, unexpected banks or steep slopes. In order to improve the ride and stability of the vehicle, this study mainly focuses on how to adjust the parameters of hydropneumatic suspension through the identification of road conditions. Firstly, the multibody model of a wheel loader with hydropneumatic suspension is developed by RecurDyn in a co-simulation with MATLAB/Simulink. Secondly, a method of road level recognition based on learning vector quantization neural network is proposed to accurately identify the level of roads on which the wheel loader travels. Then, the hydropneumatic suspension parameters are optimized by using the particle swarm algorithm. A fuzzy controller is established based on the optimized parameters of the hydropneumatic suspension to realize the active adjustment of the suspension parameters under different road levels and driving speeds. Finally, a virtual prototyping model is used to analyse the influence of the active adjustment of suspension parameters on the vertical vibration under different driving conditions. Results show that the fuzzy controller can reasonably adjust the parameters of hydropneumatic suspension according to the identified road condition and effectively reduce the vertical vibration of the wheel loader.

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Ride comfort simulation of a wheel loader with suspended axles

Cited by 28 publications

References 0 publications

Damping Multimode Switching Control of Semiactive Suspension for Vibration Reduction in a Wheel Loader

Damping Multimode Switching Control of Semiactive Suspension for Vibration Reduction in a Wheel Loader

Safety-Oriented Multi-Task Approach to Manage Whole-Body Vibration Exposure Among Quarry Operators

Active control of hydropneumatic suspension parameters of wheel loaders based on road condition identification

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