Airdrop Recovery Systems with Self‐inflating Airbag

Hong-yan, Wang; Qiang, Rui; Hong, Huangjie; Li, Jian‐Yang

doi:10.1002/9781119237358

Cited by 4 publications

(4 citation statements)

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“…In particular, in the case of the automotive industry, the problem of impact absorption is crucial, and novel technical solutions are being developed for car suspensions [1][2][3][4], internal and external car airbags [5], vehicles bumpers [6,7], and road barriers [8]. In the case of aviation and aeronautics, the typical application of shock absorbers pertains to aircraft landing gears [9][10][11], while less common but equally important are helicopter seat suspensions [12], airdrop systems [13,14], emergency landing airbags for drones [15], or suspensions of lunar-planetary landers [16]. In turn, within rescue applications, the effective protection of people falling from heights is provided by the use of impact detection systems [17] and safety airbags [18].…”

Section: Introductionmentioning

confidence: 99%

Adaptive Impact Mitigation Based on Predictive Control with Equivalent Mass Identification

Graczykowski,

Faraj

2023

Sensors

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The paper presents the concept of equivalent parameter predictive control (EPPC) elaborated for semi-active fluid-based (hydraulic and pneumatic) shock absorbers equipped with controllable valves and subjected to impact excitation. The undertaken problem concerns the absorption and dissipation of the impact energy with the requirement to minimize the generated reaction force and corresponding impacting object deceleration. The development of a control strategy for a challenging problem with unknown impacting object mass and unknown changes of external and disturbance forces is proposed and discussed in detail. The innovative solution utilizes the paradigm of model predictive control supplemented by the novel concept of equivalent system parameters identification. The EPPC is based on the online measurement of system response, the computation of the equivalent mass of the impacting object, and the repetitive solution of the optimal control problem with various prediction intervals and constraints imposed on valve opening. The presented method is proven to operate robustly for unknown excitations, including double-impact conditions, and it has similar efficiency to control methods developed previously for known impact parameters.

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Section: Introductionmentioning

confidence: 99%

Adaptive Impact Mitigation Based on Predictive Control with Equivalent Mass Identification

Graczykowski,

Faraj

2023

Sensors

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“…Dynamic excitations are present in majority of mechanical systems and as a result the protection against shock and vibration is still an attractive field of research and development. Problems of dynamic excitation mitigation concern various systems such as aircraft landing gears [1,2], airdrop systems [3,4], emergency landing airbags for drones [5], suspensions of lunar-planetary landers [6], bumpers of vehicles [7,8], road barriers [9], car airbags [10] or protection of offshore structures [11]. Large variety of shockabsorbers' applications leads to numerous technical solutions, which differ from each other in terms of construction, involved physical phenomena and complexity of control system.…”

Section: Introductionmentioning

confidence: 99%

Identification-based predictive control of semi-active shock-absorbers for adaptive dynamic excitation mitigation

Graczykowski

Faraj

2020

Meccanica

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The paper is aimed at detailed discussion of the Identification-based Predictive Control (IPC) developed for semi-active fluid-based shock-absorbers which protect structures and machines against impact excitations. The problem addressed is the optimal impact absorption providing adaptive mitigation of dynamic response of the mechanical system. The goal of applied control is dissipation of the entire impact energy and minimization of the impacting object deceleration during the process. Three proposed implementations of the IPC are based on sequentially repeated procedures, which include identification of excitation parameters and calculation of the valve opening providing minimization of tracking error of the optimal path. The presented numerical examples concerning mitigation of the dynamic excitation acting on the double-chamber pneumatic shock-absorber reveal high efficiency and prove robustness of the proposed control methods. The developed algorithms are compared against each other in terms of path-tracking efficiency and character of required control actions. The most important challenges in practical implementation of the proposed methods are indicated.

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“…The area of impact mitigation is intensively studied and it results in development of various shock-absorbers, which can be found in numerous suspension systems. These systems include landing gears [7][8][9], suspensions of space landers [10] as well as airdrop systems [11][12][13]. Simultaneously, shockabsorbers are applied in the crash protection, e.g.…”

Section: Introductionmentioning

confidence: 99%

Study on the state-dependent path-tracking for smart pneumatic shock-absorber

Faraj

Mikułowski

Wiszowaty

2020

Smart Mater. Struct.

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The paper presents an analysis of the state-dependent path-tracking method devoted to mitigation of dynamic response of systems and structures under impact excitations. The objective of the study is an evaluation of the adaptive performance and robustness of the novel control method. Robust and adaptive control methods are intensively developed by researchers and control engineers. Progress in the field influences various areas including mechanical engineering, within which these methods are applied for control of industrial processes as well as mitigation of structure dynamic response. Commonly solved problems relate especially to mitigation of vibrations, e.g. for protection of seismically excited structures. Another closely related area is the field of impact absorption, which is still challenging because of short time periods of energy absorption and number of process uncertainties. Nevertheless, due to higher and higher performance of smart sensors and actuators, as well as increasing efficiency of data processing systems, novel high-performance solutions also for impact mitigation problems can be proposed. This fact is reflected in the paper and important contribution to the field of Adaptive Impact Absorption is demonstrated. The importance of presented study results from the fact that applied smart absorber controlled with the use of kinematics-based approach ensures efficient mitigation of the impact excitation and automatic adaptation to various loading conditions. In contrast to shock-absorbers developed so far, the system implemented in laboratory provides adaptation to unknown impact conditions and compensates the influence of unpredictable perturbations. Within the paper an experimental validation of the novel control method is discussed and the system robustness to contact conditions, as well as to different values of operational medium parameters, is demonstrated. Possible extension of the method is analyzed and directions of further research are indicated.

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Airdrop Recovery Systems with Self‐inflating Airbag

Cited by 4 publications

References 0 publications

Adaptive Impact Mitigation Based on Predictive Control with Equivalent Mass Identification

Adaptive Impact Mitigation Based on Predictive Control with Equivalent Mass Identification

Identification-based predictive control of semi-active shock-absorbers for adaptive dynamic excitation mitigation

Study on the state-dependent path-tracking for smart pneumatic shock-absorber

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