Dynamic Characteristics Analysis of an Ambulance with Hydraulically Interconnected Suspension System

Tan, Bohuan; Wu, Yang; Zhang, Nong; Zhang, Bangji; Zheng, Min; Qi, Hengmin

doi:10.4271/2018-01-0815

Cited by 4 publications

(5 citation statements)

References 21 publications

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Section: Mesdmentioning

confidence: 99%

“…, 7) are the jth eigenvalue and the corresponding eigenvector, respectively, and they can be calculated using the approximate optimization method after the linearization. 31 Then, using modal theory, 35 , 36 the state vector component e x j for jth mode in the physical coordinate can be represented by coordinate transformations between physical coordinate and modal coordinate e x j = f½P (all, j) ½P À1 (j, all) + ½P Ã (all, j) ½(P À1 ) Ã (j, all) g |fflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflffl{zfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflfflffl} T jx ð29Þ in which (all, j) and (j, all) are j row and j column of the matrix, respectively. T j is 14 3 14 dimensional transformation matrix of the jth order motion-mode.…”

Section: Mesdmentioning

confidence: 99%

“…x, S H _ x, and S R _ x. Their outputs under road excitations for each motion-mode can be calculated using equation (31), and the corresponding response Y mj and output coefficient matrix C can be rewritten as…”

Section: Mesd For Apr-ihpsmentioning

confidence: 99%

“…For example, the optimal roll-resistant performance of the vehicle is usually accompanied with excessive pitch-resistant moment, which would decrease the ride comfort of the vehicle. 31 On the other hand, increasing the ride comfort would reduce the roll-and pitch-resistant performance. Therefore, the ride comfort, roll resistance, and pitch resistance trade off analysis and parameter design approach for pitch-roll-interconnected hydropneumatic suspension (PR-IHPS) are conducted in this work to balance these characters to achieve an overall optimal performance of the ambulance.…”

Section: Introductionmentioning

confidence: 99%

“…For instance, Tan and Shao superficially studied the dynamic characteristic of vehicle with pitch-roll-resistant HIS system. 31 , 32 Particularly, the roll-resistant moment and pitchresistant moments of the pitch-roll-resistant HIS are coupled together and there is a trade off among ride comfort, roll, and pitch dynamics. For example, the optimal roll-resistant performance of the vehicle is usually accompanied with excessive pitch-resistant moment, which would decrease the ride comfort of the vehicle.…”

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: Mesdmentioning

confidence: 99%