Investigation of the effect of safety belt on the seat transmissibility

Zhao, Xiaojing; Schindler, Christian

doi:10.1177/1464419314530695

Cited by 3 publications

(4 citation statements)

References 36 publications

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“…where G BX is the cross spectral density of accelerations at the cabin floor and on the seat cushion, whereas G BB is the power spectral density of accelerations at the cabin floor (Zhao and Schindler, 2014). The frequencies with transmissibility ratios greater than one indicate those frequencies that are amplified by the vibration transmission path.…”

Section: Evaluation Criteria Of the Suspension System Performancementioning

confidence: 99%

“…To evaluate suspension system efficiency in terms of reducing the vibration transmitted to pilot, seat effective amplitude transmissibility (SEAT) and transmissibility criteria are used in time and frequency domains, respectively. They are defined as followswhere GBX is the cross spectral density of accelerations at the cabin floor and on the seat cushion, whereas GBB is the power spectral density of accelerations at the cabin floor (Zhao and Schindler, 2014). The frequencies with transmissibility ratios greater than one indicate those frequencies that are amplified by the vibration transmission path.…”

Section: Vibration Assessmentmentioning

confidence: 99%

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A nonlinear seat suspension with high-static low-dynamic stiffness based on negative stiffness structure for helicopter

Davoodi

Safarpour

Pourgholi

et al. 2021

Journal of Vibration and Control

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One of the most important issues for the helicopter pilots is the health risk due to the vibration transmitted to the pilot through the seat. In this article, a seat suspension based on negative stiffness structure is presented to decrease the vibration transmitted to the pilot in both vertical and lateral directions without losing the loading capacity of the system. Here, an integrated model of the suspension–cushion–occupant is derived. To generalize the results of system analysis and its usability in other applications, the impact of parameters on the system performance is studied in dimensionless form. Despite coupling between the lateral and vertical directions, the design parameters of the seat suspension are determined in such a way that the system responds simultaneously as a negative stiffness structure in both directions. The system efficiency in vibration damping is assessed by seat effective amplitude transmissibility and transmissibility criteria. In addition, the whole body vibration and impact of the vibration on the pilot body are evaluated using ISO-2631. To verify the system efficiency in more realistic situation, the simulations are performed using the measured vibration data of a Bell-412 helicopter. The results indicate that the vibration amplitude is decreased by about 45% and 48% in the lateral and vertical directions, respectively. The frequency spectrum comparison of the seat and cabin floor reveals 80% reduction of amplitude in fundamental frequency in the vertical direction, whereas it is about 93% in the lateral direction. Furthermore, the level of pilot’s comfort and perception is improved that demonstrates better riding quality and reduced vibration environment.

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Section: Evaluation Criteria Of the Suspension System Performancementioning

confidence: 99%

Section: Vibration Assessmentmentioning

confidence: 99%

A nonlinear seat suspension with high-static low-dynamic stiffness based on negative stiffness structure for helicopter

Davoodi

Safarpour

Pourgholi

et al. 2021

Journal of Vibration and Control

View full text Add to dashboard Cite

show abstract

“…There is an important number of parameters that can influence the behavior of the driver's body in the event of an accident, and for this reason, carefully developed models are necessary [26][27][28]. Other works present the contribution of seat belts for avoiding and limiting the effects of serious accidents [29,30]. Few works, however, refer to the calculation and dimensioning of this passive safety system.…”

Section: Introductionmentioning

confidence: 99%

Three-Point Safety Polymeric Belt Webbing versus Four-Point Belt for a Race Car in Frontal Crashes

Itu,

Vlase

2023

Materials

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Polyester is currently the main material used for the manufacture of safety belts used in car transport for the protection of passengers and the driver. The seat belt is the main passive safety element used in vehicle engineering. In this work, the behavior of two safety belts, one with three-point fastening and the other with four-point fastening, which equip the seat of a racing car used in Formula Student for use in a frontal impact with a vertical wall. A model with finite elements is used to describe the entire car–driver shock-absorber assembly. The von Mises stresses calculated for both cases under consideration are below the tensile strength. The tensions arising in the belt and the accelerations required at various points of the driver’s body are determined by both the properties of the utilized polyester and the chosen construction variant. The obtained results justify the use of the three-point and four-point belt in the cases of both common and race cars.

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“…The front-end working mechanism of LHD is similar to that of the wheel loader (mostly six-bar linkage, two degrees of freedom). 3,6 Because of the complexity of the mechanism and the harsh working environment (mostly underground), 7 in practice, the static weighing method is mainly used, that is, to obtain data at a fixed position in a specific acquisition area for measurement and calculation. Although the method has high accuracy, it has some shortcomings such as vehicle retention, information delay and personnel disoperation, which greatly affects the production efficiency.…”

Section: Introductionmentioning

confidence: 99%

Dynamic modelling and accuracy analysis for front-end weighing system of LHD vehicles

Liang

Liu

Meng

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part K:

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Automatically and accurately obtaining payload information from Load-Haul-Dump (LHD) vehicles is a typical application of information and intelligence technology in engineering equipment, which provides an important support for efficient and safe construction. In this paper, a novel comprehensive weighing model for LHD with high accuracy and adaptability is proposed by Newton-Euler method. The accuracy of the model has been greatly improved with the consideration of some critical factors such as materials randomness, driving cylinders coupling, dynamic characteristics of mechanism, system damping and working pavement. The effect of the critical factors on the accuracy of weighing model is deeply analysed through significance analysis and comparison tests, which provides an important basis for the improvement of weighing model. Validation shows that the novel model is superior to traditional models in accuracy and adaptability. In theory, the accuracy of novel model is at least 3 times higher than that of traditional models, and its accuracy can still achieve ±0.3% in complex velocity or acceleration motion, and the larger the load mass, the higher the accuracy. As a result, the novel comprehensive weighing model can provide accurate load information for LHD vehicles without affecting working efficiency. It is of great theory and application value to the development of information and intelligence technology in engineering equipment and contributes to efficient and safe construction.

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Investigation of the effect of safety belt on the seat transmissibility

Cited by 3 publications

References 36 publications

A nonlinear seat suspension with high-static low-dynamic stiffness based on negative stiffness structure for helicopter

A nonlinear seat suspension with high-static low-dynamic stiffness based on negative stiffness structure for helicopter

Three-Point Safety Polymeric Belt Webbing versus Four-Point Belt for a Race Car in Frontal Crashes

Dynamic modelling and accuracy analysis for front-end weighing system of LHD vehicles

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