The dynamic performance optimization for nonlinear vibration-reduction system of the tracked ambulance

Yang, Meng; Xu, Xin; Su, Weihua; Duan, Deguang; Chen, Su

doi:10.1177/0954406215569897

Cited by 9 publications

(11 citation statements)

References 20 publications

(22 reference statements)

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“…The impedance matrix T(s) can be obtained by equation (9), which depends on the physical parameters of the fluid components. Then, the equations of motion of coupling system, applying the Laplace transform with zero initial conditions, can be rewritten as…”

Section: Boundary Equations For the Vehicle And Pr-ihpsmentioning

confidence: 99%

“…[5][6][7][8] So far, a limited number of studies have been carried out for the suspension system of stretcher, involving passive, semi-active, and active techniques. For instance, Yang and colleagues [9][10][11] presented a nonlinear vibration reduction stretcher system for tracked ambulance. Xu et al 12 optimized the damping characteristic of stretchers on emergency ambulance.…”

Section: Introductionmentioning

confidence: 99%

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Improvement of ride quality for patient lying in ambulance with a new hydro-pneumatic suspension

Tan

Zhang

et al. 2019

Advances in Mechanical Engineering

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Instability caused by emergency braking and steering during ambulance operation would easily lead to a sharp rise of blood pressure in patient's head, which would further cause a secondary injury to the patient. Furthermore, the vibration generated by uneven road would result in patient's nausea and deterioration of patient's condition. This article proposes a pitch-roll-interconnected hydro-pneumatic suspension system which can achieve the resistance control for pitch, roll, and bounce modes of ambulances to improve the stability and attenuate the vibration for the lying patients. The ambulance with pitch-roll-interconnected hydro-pneumatic suspension is characterized by 7 degrees of freedom dynamic model, in which the characteristics of pitch-roll-interconnected hydro-pneumatic suspension are explicitly formulized using hydrodynamic equation derivation. A motion-mode energy spectral density method is proposed to decouple the vibration energy for bounce, pitch, and roll modes in frequency domain. Subsequently, the parameter design approach incorporated with the suspension characteristic equations and motion-mode energy spectral density method is also presented to optimize the lying patient's ride comfort and ambulance's handling stability. The numerical simulation results show that the proposed pitch-roll-interconnected hydro-pneumatic suspension system can simultaneously provide pitch-roll-stiffness and damping without generating additional bounce-stiffness, resulting in superior ride comfort and handling stability compared to the conventional suspension.

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Section: Boundary Equations For the Vehicle And Pr-ihpsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improvement of ride quality for patient lying in ambulance with a new hydro-pneumatic suspension

Tan

Zhang

et al. 2019

Advances in Mechanical Engineering

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show abstract

“…In the following studies, the improved partitioning and dimensional increment precise integration method will be used many times to calculate the output of the vibration reduction system. The method is described in detail in reference [1] and needs not be repeated in this paper.…”

Section: The Comparison Of Structure Optimization Schemesmentioning

confidence: 99%

“…Therefore, the structure optimization for tracked ambulance nonlinear vibration reduction system has important practical significance. In the previous study, the performance of tracked ambulance nonlinear vibration reduction system has been studied and improved [1]. However, the structure improvement is not covered in the study.…”

Section: Introductionmentioning

confidence: 99%

The structure optimization for nonlinear vibration reduction system of the tracked ambulance

Yang¹,

Wang²,

Hu³

2017

J. vibroeng.

Self Cite

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This paper aims at improving the performance of tracked ambulance nonlinear vibration reduction system by the structure optimization design. The structure optimization focuses on the stretcher base. Two structure optimization schemes are proposed based on the mechanism of dynamic vibration absorber (DVA), namely, the linear and nonlinear structure optimization schemes. The linear structure optimization scheme is finally adopted by comparison of two schemes under random vibration, and the performance of linear scheme is also validated under shock vibration. Then the global sensitivity analysis method is applied to calculate the parameter sensitivity of nonlinear vibration reduction system. At last, the nondominated sorting genetic algorithm II (NSGA-II) is used to optimize the performance of the nonlinear vibration reduction system. It shows the vibration energy of the supine human body on stretcher is reduced after above studies, which proves the validity and feasibility of the structure optimization schemes proposed, and the optimization studies applied in this paper.

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“…A tracked ambulance with stretcher was simplified into a 4-DOF ambulance model in plane, and ride comfort of supine patient under random road was optimized by NSGA-II [7,8]. Xu et al [9]optimized a structure of stretcher to reduce vibration of supine patient based on the ambulance model built by Yang et al [7], but wheels and human body were ignored in the 4-DOF ambulance model. By analyzing the former studies, we conclude that the prior research studies mainly focused on improving ride comfort of supine patient.…”

Section: Introductionmentioning

confidence: 99%

Multi‐objective optimization of ambulance ride comfort under speed bump

Guo

Wang

et al. 2019

IEEJ Transactions Elec Engng

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Ambulance ride comfort not only impacts health of patients, but influences handling capability of drivers. Previous studies on ambulance ride comfort mainly focused on analysis and optimization of ride comfort of supine patients, but ride comfort of drivers was ignored. For solving this problem, a 10°‐of‐freedom (DOF) vibration model of ambulance was established, and a supine patient on stretcher and a driver on seat were included in the model. The excitations on front and rear wheel were proposed according to speed bump, which have a great impact on occupants. The objective function and design variables of multi‐objective optimization were determined, and the parameters of design variables were solved by using Elitist Nondominated Sorting Genetic Algorithm (NSGA‐II). Based on the parameters before and after optimization, ride comfort of supine patient and driver was analyzed. The results show that ride comfort of supine patient and driver in ambulance under speed bump was improved 20% and 7%, respectively, and ride comfort of supine patient and driver in ambulance under random road was increased by 9% after optimization. Multi‐objective optimization of ambulance ride comfort under speed bump can improve ride comfort of supine patient and driver, and has a good optimal effect. © 2019 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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The dynamic performance optimization for nonlinear vibration-reduction system of the tracked ambulance

Cited by 9 publications

References 20 publications

Improvement of ride quality for patient lying in ambulance with a new hydro-pneumatic suspension

Improvement of ride quality for patient lying in ambulance with a new hydro-pneumatic suspension

The structure optimization for nonlinear vibration reduction system of the tracked ambulance

Multi‐objective optimization of ambulance ride comfort under speed bump

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