“…Due to the nonlinear stiffness and damping properties produced by the nonlinearity of geometric relations within the SLSs, the isolator has noticeable performance with structural non-linearity and only passive elements. Wu et al (2016) studied on a novel 6-DOF passive vibration isolator which has been validated with experiments that the isolator has effective isolation behavior in all the six directions and takes the advantage of passive control on account of the combination of the Stewart platform and the X-shape structure. Zhou et al (2017) extended the QZS vibration isolation method from one DOF to six DOFs by the method of applying a new-type QZS strut to establish a 6-DOF QZS vibration isolation platform, which possesses broader bandwidth and higher effectiveness compared with the linear counterpart.…”
Harmful vibrations can cause many engineering problems, such as disasters of civil engineering structures, failure of precision equipment, and the disruption of some spacecraft components. In most situations, the vibrations are usually three-dimensional excitations. Therefore, research on multi-dimensional vibration control has become a worldwide hotspot in engineering. This article presents a comprehensive assessment of recent developments of multi-dimensional vibration mitigation devices and the material applied in such devices. The vibration mitigation materials mainly include the passive vibration mitigation materials and smart vibration mitigation materials. Subsequently, the vibration mitigation devices in civil engineering, mechanical engineering, and aerospace engineering are reviewed and commented, respectively. Above all, the multi-dimensional vibration mitigation devices and materials are found to be effective for reducing multi-dimensional vibrations. However, enhancing the mitigation performance of the devices in each direction, including improving the mitigation capability of materials, is still a challenging issue.
“…Due to the nonlinear stiffness and damping properties produced by the nonlinearity of geometric relations within the SLSs, the isolator has noticeable performance with structural non-linearity and only passive elements. Wu et al (2016) studied on a novel 6-DOF passive vibration isolator which has been validated with experiments that the isolator has effective isolation behavior in all the six directions and takes the advantage of passive control on account of the combination of the Stewart platform and the X-shape structure. Zhou et al (2017) extended the QZS vibration isolation method from one DOF to six DOFs by the method of applying a new-type QZS strut to establish a 6-DOF QZS vibration isolation platform, which possesses broader bandwidth and higher effectiveness compared with the linear counterpart.…”
Harmful vibrations can cause many engineering problems, such as disasters of civil engineering structures, failure of precision equipment, and the disruption of some spacecraft components. In most situations, the vibrations are usually three-dimensional excitations. Therefore, research on multi-dimensional vibration control has become a worldwide hotspot in engineering. This article presents a comprehensive assessment of recent developments of multi-dimensional vibration mitigation devices and the material applied in such devices. The vibration mitigation materials mainly include the passive vibration mitigation materials and smart vibration mitigation materials. Subsequently, the vibration mitigation devices in civil engineering, mechanical engineering, and aerospace engineering are reviewed and commented, respectively. Above all, the multi-dimensional vibration mitigation devices and materials are found to be effective for reducing multi-dimensional vibrations. However, enhancing the mitigation performance of the devices in each direction, including improving the mitigation capability of materials, is still a challenging issue.
“…Inspired by the bird’s leg structure, a new bio-inspired limb-like or X-shaped anti-vibration structure (Fig. 2 ) was proposed and studied recently in [ 12 – 17 ]. Fig.…”
Section: The Novel Bio-inspired Passive Suspension Structurementioning
confidence: 99%
“…The X-shaped anti-vibration structure turned out to be very effective to isolate shock and vibration and keep the upper platform steady. It has been shown that the X-shaped structure was proved to be a quasi-zero-stiffness (QZS) system, which had the characteristic that can isolate a much broader frequency band of vibration range than traditional linear isolation systems [ 12 – 17 ]. The QZS system can be optimized to keep the static stiffness high and dynamic stiffness low by properly designing the system parameters, which means the system can remain a high loading capacity while most of vibrations can be isolated during motions.…”
Section: The Novel Bio-inspired Passive Suspension Structurementioning
confidence: 99%
“…6 for all structural parameter definitions, and from Fig. 6 the geometry relationship [ 12 – 17 ] can be obtained as Define position a is the equilibrium state and initial force of the spring F 0 , then When the mass M is moving downwards to the position b , the restoring force when the mass is at position b is The force can be presented by y Thus, the curve of nonlinear restoring force with different displacement y of the bio-inspired 3 layer leg suspension structure can be present in the following figure. Fig.…”
Section: Structural Modeling and Suspension Analysismentioning
For track-based robots, an important aspect is the suppression design, which determines the trafficability and comfort of the whole system. The trafficability limits the robot's working capability, and the riding comfort limits the robot's working effectiveness, especially with some sensitive instruments mounted on or operated. To these aims, a trackbased robot equipped with a novel passive bio-inspired suspension is designed and studied systematically in this paper. Animal or insects have very special leg or limb structures which are good for motion control and adaptable to different environments. Inspired by this, a new track-based robot is designed with novel "legs" for connecting the loading wheels to the robot body. Each leg is designed with passive structures and can achieve very high loading capacity but low dynamic stiffness such that the robot can move on rough ground similar to a multi-leg animal or insect. Therefore, the trafficability and riding comfort can be significantly improved without losing loading capacity. The new track-based robot can be well applied to various engineering tasks for providing a stable moving platform of high mobility, better trafficability and excellent loading capacity.
“…In recent years, due to low cost and high reliability, passive impact/vibration isolation methods based on bioinspired X-shaped structure were proposed and studied. [15][16][17] In the X-shaped structure, nonlinear damping and stiffness induced by geometric relationship of rod, rotation joints, and spring were exploited to isolate vibration perturbation. It demonstrated that the X-shaped structure can perform good vibration due to the nonlinear damping and stiffness which can be designed through changing structure parameters.…”
On-orbit capture is an important technique for the space debris removal, refueling, or malfunction satellite repairing. While due to the uncertainty of the motion parameters of the space noncooperative target, the impact between the capture device and the noncooperative target during the capturing process is inevitable, which may bring strong vibration perturbation to the base satellite, and potentially alter the position and the attitude of the servicing spacecraft, or even cause failure of onorbit tasks. This article presents a new and alternative method for passive suppression of spacecraft impact and perturbation during noncooperative spacecraft capture. The passive device based on bioinspired X-shape is installed between the satellite and the capture device. In the capture process, nonlinear damping of the passive isolation structure can significantly reduce impact/vibration perturbation. For performance analysis, dynamic equations of the isolation system are established. Based on which, the relationship between structure parameters and isolation performance is systematically analyzed. Experiments are conducted for verification of the effectiveness of the proposed method. Moreover, an optimal process using the nondominated sorting genetic algorithm II optimization method is developed to minimize impact/vibration perturbation effect, and optimal solutions can provide useful reference for the passive isolation system design.
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