“…Yang et al [18] summarize several existing methods for the characterization of the aircraft tire, starting with the point contact theory, capable of relating the tire strength and moment [22]. The point contact theory is composed by a spring k and a dashpot c in parallel, as shown in Figure 2a.…”
Section: Tirementioning
confidence: 99%
“…The rigid band model, Figure 2c, does not provide for the vertical restriction between the point of contact with the pavement and the center of the wheel [24]. In the rigid band model, the tire is also modeled by a parallel of spring k and dashpot c [18]. Figure 2d shows the fixed footprint model and results from the linear distribution of the contact zone between the tire and the pavement.…”
Section: Tirementioning
confidence: 99%
“…Yang et al [18] selected the six DOFs, the vertical degrees of freedom, referring to the most usual way of modeling the airframe. In addition to airframe modeling, suspension, tires, and pavement modeling should be added [16,18]. The suspension typically comprises a linear spring k and a damper c in parallel (Figure 1a).…”
“…The suspension is modeled as a nonlinear spring (Figure 1b) and velocity squared dampers (Figure 1c). The authors also propose the prediction of soil rutting (Figure 1d,e) by adding a rebound b degree, which is present in soils [18]. The landing gear and the aircraft tires become prominent during takeoff and landing [19].…”
The aircraft is a means of transportation that operates mainly in the air; however, it starts and ends its journey on the ground. Due to the aircraft’s structural complexity, simulation tools are used to understand and to predict its behavior in its movements on the ground. Simulation tools allow adjusting the observation parameters to gather a greater amount of data than real tests and explore interactions of the aircraft and their individual components with external objects such as pavement imperfections. This review aims to collect information on how to simulate the aircraft interaction with traffic-dependent energy harvesting systems. The specifications and framework to be met by a conceptual design are explored. The different configurations for simulating the aircraft configuration result in the selection of the two-mass-spring-damper model. For the components, especially the landing gear, a deployable element for on-ground movements, several existing models capable of translating the tire are also presented, resulting in a selection of point-contact, Fiala and Unified semi-empirical models. It is verified which software can address the proposed simulation, such as GearSim from SDI-Engineering and Matlab/Simulink/Simscape Multibody from MathWorks.
“…Yang et al [18] summarize several existing methods for the characterization of the aircraft tire, starting with the point contact theory, capable of relating the tire strength and moment [22]. The point contact theory is composed by a spring k and a dashpot c in parallel, as shown in Figure 2a.…”
Section: Tirementioning
confidence: 99%
“…The rigid band model, Figure 2c, does not provide for the vertical restriction between the point of contact with the pavement and the center of the wheel [24]. In the rigid band model, the tire is also modeled by a parallel of spring k and dashpot c [18]. Figure 2d shows the fixed footprint model and results from the linear distribution of the contact zone between the tire and the pavement.…”
Section: Tirementioning
confidence: 99%
“…Yang et al [18] selected the six DOFs, the vertical degrees of freedom, referring to the most usual way of modeling the airframe. In addition to airframe modeling, suspension, tires, and pavement modeling should be added [16,18]. The suspension typically comprises a linear spring k and a damper c in parallel (Figure 1a).…”
“…The suspension is modeled as a nonlinear spring (Figure 1b) and velocity squared dampers (Figure 1c). The authors also propose the prediction of soil rutting (Figure 1d,e) by adding a rebound b degree, which is present in soils [18]. The landing gear and the aircraft tires become prominent during takeoff and landing [19].…”
The aircraft is a means of transportation that operates mainly in the air; however, it starts and ends its journey on the ground. Due to the aircraft’s structural complexity, simulation tools are used to understand and to predict its behavior in its movements on the ground. Simulation tools allow adjusting the observation parameters to gather a greater amount of data than real tests and explore interactions of the aircraft and their individual components with external objects such as pavement imperfections. This review aims to collect information on how to simulate the aircraft interaction with traffic-dependent energy harvesting systems. The specifications and framework to be met by a conceptual design are explored. The different configurations for simulating the aircraft configuration result in the selection of the two-mass-spring-damper model. For the components, especially the landing gear, a deployable element for on-ground movements, several existing models capable of translating the tire are also presented, resulting in a selection of point-contact, Fiala and Unified semi-empirical models. It is verified which software can address the proposed simulation, such as GearSim from SDI-Engineering and Matlab/Simulink/Simscape Multibody from MathWorks.
“…Currently, the field of aeronautics already offers a proven means of achieving a robust landing: the arresting gear used on aircraft carriers to recover airplanes within an incredibly short distance [22,23]. In a typical design, several arresting cables are strung across the deck of the carrier, and the pilot actively guides the plane to snag its tail hook on one of the cables.…”
Recent successful recovery techniques for rockets require that rockets maintain a vertical configuration with zero vertical and lateral velocities; otherwise, landings may fail. To relax this requirement, a new active-arresting system (inspired by the arresting gears used on aircraft carriers) is proposed herein to achieve a robust landing, even if the rocket deviates from the target position or has notable residual velocities and inclinations. The system consists of four deployable onboard hooks above the rocket's center of mass, an on-ground apparatus containing four arresting cables forming a square capture frame, and four buffer devices to actively catch and passively decelerate the landing rocket. To catch the rocket, the capture frame was controlled by servo motors via a simple proportional-derivative controller. After catching, the buffer devices generate decelerating forces to stop its motion. A flexible multibody model of the proposed system was built to evaluate its robust performance under various combinations of multiple uncertainties, such as noise measurement, time delay in the motor, initial conditions, and wind excitation. Using a quasi-Monte Carlo method, hundreds of deviated landing cases were generated and simulated. The results confirmed the robustness of the proposed system for achieving successful terminal landings.
Lattice structures are widely used in many engineering fields due to their excellent mechanical properties such as high specific strength and high specific energy absorption (SEA) capacity. In this paper, square-cell lattice structures with different lattice orientations are investigated in terms of the deformation modes and the energy absorption (EA) performance. Finite element (FE) simulations of in-plane compression are carried out, and the theoretical models from the energy balance principle are developed for calculating the EA of these lattice structures. Satisfactory agreement is achieved between the FE simulation results and the theoretical results. It indicates that the 30 • oriented lattice has the largest EA capacity. Furthermore, inspired by the polycrystal microstructure of metals, novel structures of bi-crystal lattices and quad-crystal lattices are developed through combining multiple singly oriented lattices together. The results of FE simulations of compression indicate that the EA performances of symmetric lattice bi-crystals and quad-crystals are better than those of the identical lattice polycrystal counterparts. This work confirms the feasibility of designing superior energy absorbers with architected meso-structures from the inspiration of metallurgical concepts and microstructures.
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