Transmission characteristics of suspension seats in multi-axis vibration environments

Smith, Suzanne D.; Smith, Jeanne A.; Bowden, David R.

doi:10.1016/j.ergon.2007.10.028

Cited by 22 publications

(15 citation statements)

References 13 publications

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“…They observed changes in the damped natural frequency with increasing magnitude of vibration, indicating nonlinearity in the suspension. Using the vibration measured on the floor of the locomotive of a passenger train in field tests and computer-generated broadband excitation (1.0 ms -2 r.m.s between 1 and 80 Hz), Smith et al [5] determined the transmission characteristics in three orthogonal translational directions for two locomotive driver seats. They concluded that without considering the effect of off-axis coupling and other factors, the system transfer matrix evaluated using a multipleinput single-output model would be less than ideal for predicting the low frequency vibration experienced when using a suspension seat.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Characteristics of a Suspension Seat Determined in Laboratory Study

Qiu¹

2017

J Ergonomics

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Suspension seat is a key component of construction machinery for isolating the vibration transmitted to the driver and reducing discomfort and health risks. An in-depth understanding of the dynamic characteristics of suspension seats can assist in optimising suspension seat design. The methods, measurement data and findings reported in this paper are not only applied to optimising seating comfort of motor graders, but also useful for improving seating design of other types of construction machinery.

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Section: Introductionmentioning

confidence: 99%

Dynamic Characteristics of a Suspension Seat Determined in Laboratory Study

Qiu¹

2017

J Ergonomics

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“…e characteristics of the dynamic responses of a seated human body are mainly affected by low-frequency vibrations (below 50 Hz). A number of studies have also found that the fundamental frequency of a seated human exposed to wholebody vibration is lower than 10 Hz [1][2][3][4][5]. e natural frequencies and frequency responses of a seated human are decided depending on body weight, length of human segments, and sitting posture (e. g., slouched or erect) [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Development of a Five‐Degree‐of‐Freedom Seated Human Model and Parametric Studies for Its Vibrational Characteristics

Bae

Kang

2018

Shock and Vibration

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This study focuses on the biodynamic responses of a seated human model to whole-body vibrations in a vehicle. Five-degree-of-freedom nonlinear equations of motion for a human model were derived, and human parameters such as spring constants and damping coefficients were extracted using a three-step optimization processes that applied the experimental data to the mathematical human model. The natural frequencies and mode shapes of the linearized model were also calculated. In order to examine the effects of the human parameters, parametric studies involving initial segment angles and stiffness values were performed. Interestingly, mode veering was observed between the fourth and fifth human modes when combining two different spring stiffness values. Finally, through the frequency responses of the human model, nonlinear characteristics such as frequency shift and jump phenomena were clearly observed.

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“…向统一模型之间的差异，为列车振动模型的选取提供了有效参考；文献 [7]利用全局灵敏度方法分析了垂向悬挂参数对列车运行平稳性的影响，为轨道车辆悬挂系统参数的优化提供了指导；文献 [8][9]和文献 [10][11]分别对转向架垂向悬挂系统参数和座椅悬置系统参数进行了优化，为轨道车辆垂向悬挂系统参数的选取提供了有效借鉴。然而先前对于轨道车辆垂向动力学分析及悬挂系统参数优化的研究，通常是将轨道车辆的转向架-车体系统和座椅系统分开单独进行的，而实际上列车的各系统，即转向架-车体系统和座椅系统是相互影响且共同对列车的动态性能起作用的 [12][13] 。随着高速列车运行速度的不断提高，由于轨道不平顺引起的振动对人体的影响作用越来越强 [14] 。因此，建立一个能够较为真实地反映高速列车垂向振动特性和人体振动基本特征的动力学模型，进一步深入研究高速列车垂向悬挂系统参数的优化设计，显得十分必要。本文在传统高速列车垂向动力学模型的基础上，考虑座椅和人体振动作用的影响，对高速列车转向架-车体-座椅耦合系统垂向动力学模型的建立进行研究，并对各系统之间的相互耦合作用关系进行探讨；在此基础上，以人体振动舒适性最佳为目标，对轨道随机不平顺激励下的高速列车垂向悬挂系统进行多目标、多参数优化，为高速列车垂向悬挂系统参数的选取提供有效指导。 1 耦合系统模型及振动响应求解 [15] ；J c 、J t 分别为车体和转向架构架的点头转动惯量；K p 、K s 、K z 分别为一系悬挂、二系悬挂和座椅悬置的垂向等效刚度； [7,16] ( 2 6 3)…”

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Vertical Coupled Vibration Mechanism of Bogie-body-seat System and Joint Optimization of Suspension Parameters for High-speed Train

YU¹

2018

JME

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Abstract：For the problem of high speed train suspension parameters matching, using the method of system engineering, taking the bogie system, the car body, and the seat system as a unified whole system, a vertical dynamic model of high-speed train bogie-body-seat coupling system is established and the interaction between the systems is discussed. Based on this, taking optimal ride comfort as target, the optimization of the vertical suspension system of high-speed train under the excitation of track random irregularity is carried out and a joint optimization method of vertical suspension parameters for bogie-body-seat coupling system is built. Through numerical computations, it is known that the ride comfort of high-speed train has been significantly improved after the vertical suspension parameters been optimized, and the body vertical weighed root mean square acceleration value at different positions is reduced by more than 18.52%, the results show that the joint optimization method of vertical suspension parameters for bogie-body-seat coupling system established is workable. This research provides an efficient method for the selection of vertical suspension parameters of high-speed train.

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Transmission characteristics of suspension seats in multi-axis vibration environments

Cited by 22 publications

References 13 publications

Dynamic Characteristics of a Suspension Seat Determined in Laboratory Study

Dynamic Characteristics of a Suspension Seat Determined in Laboratory Study

Development of a Five‐Degree‐of‐Freedom Seated Human Model and Parametric Studies for Its Vibrational Characteristics

Vertical Coupled Vibration Mechanism of Bogie-body-seat System and Joint Optimization of Suspension Parameters for High-speed Train

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