Experimental Investigation of Two Types Interconnected Hydro-Pneumatic Struts

Dynamic Properties Analysis of a New Kind of Inter-Connected Hydro-Pneumatic Strut

“…Then, the related dynamic models will be established based on the derived equation of motion through AMEsim software, and the validity of the established model will be verified through the comparison with available literatures and partial experimental data. Finally, extensive parameters analysis will be presented to illustrate the validity of the proposed IC HPS design and its advantage comparing with those presented by Wu [15], Cao et al [16][17][18][19] and Lin et al [24]. The result shows that (1) comparing with the design proposed by Wu [15], the added Annual Gas Chamber (AGC), working as an extra absorber, can postpone the flow fluid restriction (distortion), and then increase the working envelop in the In-Phase test signal; (2) comparing with the design proposed by Lin et al [24], the orifices between the main and annual fluid chamber in the proposed IC HPS have been cancelled, which can increase the system stiffness in the Out-of-Phase working condition; (3) the dynamic properties of the proposed IC-HPS can be easily modified through the pre-charging pressure in AGC in large working range.…”

“…Zhang et al [22] investigate the sensitivity analysis of this kind of HPS through the nonlinear mathematic model. Lin et al [23] firstly investigated the dynamic properties of the single HPS design presented by Wu [15] and then its interconnection working condition, as illustrated in Figure 1 (b) [24]. Lin et al [24] compared the dynamic properties of Type 2 IC HPS illustrated in Figure 1 (b) with those presented by Cao et al [19], as illustrated in Figure 1 (a), through experimental set-up and the established AMEsim model.…”

“…Lin et al [23] firstly investigated the dynamic properties of the single HPS design presented by Wu [15] and then its interconnection working condition, as illustrated in Figure 1 (b) [24]. Lin et al [24] compared the dynamic properties of Type 2 IC HPS illustrated in Figure 1 (b) with those presented by Cao et al [19], as illustrated in Figure 1 (a), through experimental set-up and the established AMEsim model. The results presented by Lin et al [24] show that (1) For the IC HPS model presented by Wu [15] illustrated in Figure 1 (a), the phenomenon of output force distortion occurs under compression stroke in the In-Phase test, and it is easily to be totally block in the Out-of-Phase test.…”

“…Lin et al [24] compared the dynamic properties of Type 2 IC HPS illustrated in Figure 1 (b) with those presented by Cao et al [19], as illustrated in Figure 1 (a), through experimental set-up and the established AMEsim model. The results presented by Lin et al [24] show that (1) For the IC HPS model presented by Wu [15] illustrated in Figure 1 (a), the phenomenon of output force distortion occurs under compression stroke in the In-Phase test, and it is easily to be totally block in the Out-of-Phase test. This is mainly related to the delay/block of the fluid flow in the interconnected pipes [24]; (2) For the model presented by Lin et al [24], although the phenomenon of the output force distortion can be limited in small working range, it meets the small stiffness condition in the Out-of-Phase working condition which may be modified by changing the dimension of the size of orifices and/or connection pipes.…”

“…Considering the above, this research paper will propose a novel IC HPS design based on a developed double-gaschamber HPS illustrated in Figure 1 (c) (Type 3 IC HPS) in which an extra air chamber will be installed in the annual chamber of HPS separated the fluid chamber through a floating piston as shown in Figure 1 (c). Fundamentally, this kind of design is focused on solving the phenomenon of the output force distortion and block of the design presented by Wu [15] illustrated in Figure 1 (a) (Type 1 IC HPS), and providing acceptably stiffness performance comparing with those introduced by Lin et al [24] illustrated in Figure 1 (b) (Type 2 IC HPS). Firstly, the equation of motion of three kind of IC HPS designs will be derived.…”