Bending Pneumatic Artificial Muscles(PAMs)are particularly attractive and extensively applied to the soft grasper,snake-like robot,etc.To extend the application of PAMs,we fabricate a Multi-directional Bending Pneumat...Bending Pneumatic Artificial Muscles(PAMs)are particularly attractive and extensively applied to the soft grasper,snake-like robot,etc.To extend the application of PAMs,we fabricate a Multi-directional Bending Pneumatic Artificial Muscle(MBPAM)that can bend in eight directions by changing the pressurized chambers.The maximum bending angle and output force are 151°and 0.643 N under the pressure of 100 kPa,respectively.Additionally,the Finite Element Model(FEM)is established to further investigate the performance.The experimental and numerical results demonstrate the nonlinear relationship between the pressure and the bending angle and output force.Moreover,the effects of parameters on the performance are studied with the validated FEM.The results reveal that the amplitude of waves and the thickness of the base layer can be optimized.Thus,multi-objective optimization is performed to improve the bending performance of the MBPAM.The optimization results indicate that the output force can be increased by 7.8%with the identical bending angle of the initial design,while the bending angle can be improved by 8.6%with the same output force.Finally,the grasp tests demonstrate the grip capability of the soft four-finger gripper and display the application prospect of the MBPAM in soft robots.展开更多
Erratumto:Journal of Bionic Engineering(2023)20:338-348 https:/doi.0rg/10.1007/s42235-022-00247-4 In Table 1,the value of Mesh's Feature dimensions(mm)"0.42"should have read"0.04".The original ...Erratumto:Journal of Bionic Engineering(2023)20:338-348 https:/doi.0rg/10.1007/s42235-022-00247-4 In Table 1,the value of Mesh's Feature dimensions(mm)"0.42"should have read"0.04".The original article has been corrected.展开更多
Solid–liquid separation is widely used in daily life and practical engineering.Traditional industrial filters are prone to clogging,but this rarely occurs in filter-feeding organisms.Inspired by the filter feeding me...Solid–liquid separation is widely used in daily life and practical engineering.Traditional industrial filters are prone to clogging,but this rarely occurs in filter-feeding organisms.Inspired by the filter feeding mechanism of balaenid whales and considering the local grooves in the fringes layer,a new bionic filter is produced by 3D printing technology through the bionic design of the parallel channels inside the mouth of balaenid whales.At the same time,a test platform composed of the bionic filter,peristaltic pump,fluid pulse rectifier and water tank is built to carry out the fluid flow pattern dyeing and particle filtration experiments.It is found that fluid separation occurs near the groove structure and local vortices are generated.The vortex control filtration mechanism makes the particles in the front grooves tend to accumulate on the left side,which has a certain anti-clogging effect.Moreover,the increase of flow velocity leads to the enhancement of vortices,which makes the accumulation effect on the left more obvious.This study initially practices the bionic application from biological model to engineering design,and the vortex control anti-clogging filtration mechanism proposed in the study has a wide range of application prospects and values.展开更多
A model of crosslinker unbinding is implemented in a highly coarse- grained granular model of F-actin cytoskeleton. We employ this specific granular model to study the mechanisms of the compressive responses of F-acti...A model of crosslinker unbinding is implemented in a highly coarse- grained granular model of F-actin cytoskeleton. We employ this specific granular model to study the mechanisms of the compressive responses of F-actin networks. It is found that the compressive response of F-actin cytoskeleton has dependency on the strain rate. The evolution of deformation energy in the network indicates that crosslinker unbinding events can induce the remodelling of F-actin cytoskele- ton in response to external loadings. The internal stress in F-actin cytoskeleton can efficiently dissipate with the help of crosslinker unbinding, which could lead to the soontaneous relaxation of living cells.展开更多
Accurate determination of inner wall temperature fluctuations is critical for thermal fatigue assessment in sodiumcooled fast reactors(SFR)piping systems,but remains inaccessible for direct measurement due to extreme ...Accurate determination of inner wall temperature fluctuations is critical for thermal fatigue assessment in sodiumcooled fast reactors(SFR)piping systems,but remains inaccessible for direct measurement due to extreme operational conditions involving high temperature and chemical activity of liquid sodium.To overcome this challenge,this study proposes a self-adaptive Gaussian process regression(GPR)approach.The large eddy simulations(LES)of hot and cold liquid sodium mixing in T-junction pipes are conducted to quantify intense thermal-fluid interactions,revealing that inner wall temperature fluctuations are significantly higher than those at the outer walls.Building on these insights,we develop a self-adaptive GPR approach that integrates tree-structured composite kernel optimization with gradient-based hyperparameter tuning.The resulting approach accurately predicts inner wall temperature fluctuations using only outer wall measurements and corresponding operational parameters,achieving a predictive performance of determination coefficient R^(2)>0.95,and retaining robustness(R^(2)>0.75)even when trained on limited datasets.The proposed self-adaptive GPR approach offers non-intrusive,real-time thermal diagnostics for SFR piping systems,utilizing composite kernels that afford clear physical interpretability.Moreover,it provides a promising tool for safety monitoring in reactor cores,heat exchangers,and other nuclear components requiring high-fidelity thermal transient analysis.展开更多
基金the National Natural Science Foundation of China(11872178,51621004)are gratefully acknowledged。
文摘Bending Pneumatic Artificial Muscles(PAMs)are particularly attractive and extensively applied to the soft grasper,snake-like robot,etc.To extend the application of PAMs,we fabricate a Multi-directional Bending Pneumatic Artificial Muscle(MBPAM)that can bend in eight directions by changing the pressurized chambers.The maximum bending angle and output force are 151°and 0.643 N under the pressure of 100 kPa,respectively.Additionally,the Finite Element Model(FEM)is established to further investigate the performance.The experimental and numerical results demonstrate the nonlinear relationship between the pressure and the bending angle and output force.Moreover,the effects of parameters on the performance are studied with the validated FEM.The results reveal that the amplitude of waves and the thickness of the base layer can be optimized.Thus,multi-objective optimization is performed to improve the bending performance of the MBPAM.The optimization results indicate that the output force can be increased by 7.8%with the identical bending angle of the initial design,while the bending angle can be improved by 8.6%with the same output force.Finally,the grasp tests demonstrate the grip capability of the soft four-finger gripper and display the application prospect of the MBPAM in soft robots.
文摘Erratumto:Journal of Bionic Engineering(2023)20:338-348 https:/doi.0rg/10.1007/s42235-022-00247-4 In Table 1,the value of Mesh's Feature dimensions(mm)"0.42"should have read"0.04".The original article has been corrected.
基金supports from the National Natural Science Foundation of China(51775169)the High Level Talent Foundation of Henan University of Technology(31401456)the Innovative Funds Plan of Henan University of Technology(2020ZKCJ26)are gratefully acknowledged.
文摘Solid–liquid separation is widely used in daily life and practical engineering.Traditional industrial filters are prone to clogging,but this rarely occurs in filter-feeding organisms.Inspired by the filter feeding mechanism of balaenid whales and considering the local grooves in the fringes layer,a new bionic filter is produced by 3D printing technology through the bionic design of the parallel channels inside the mouth of balaenid whales.At the same time,a test platform composed of the bionic filter,peristaltic pump,fluid pulse rectifier and water tank is built to carry out the fluid flow pattern dyeing and particle filtration experiments.It is found that fluid separation occurs near the groove structure and local vortices are generated.The vortex control filtration mechanism makes the particles in the front grooves tend to accumulate on the left side,which has a certain anti-clogging effect.Moreover,the increase of flow velocity leads to the enhancement of vortices,which makes the accumulation effect on the left more obvious.This study initially practices the bionic application from biological model to engineering design,and the vortex control anti-clogging filtration mechanism proposed in the study has a wide range of application prospects and values.
基金supported by the ARC Future Fellowship Grant(FT100100172)
文摘A model of crosslinker unbinding is implemented in a highly coarse- grained granular model of F-actin cytoskeleton. We employ this specific granular model to study the mechanisms of the compressive responses of F-actin networks. It is found that the compressive response of F-actin cytoskeleton has dependency on the strain rate. The evolution of deformation energy in the network indicates that crosslinker unbinding events can induce the remodelling of F-actin cytoskele- ton in response to external loadings. The internal stress in F-actin cytoskeleton can efficiently dissipate with the help of crosslinker unbinding, which could lead to the soontaneous relaxation of living cells.
基金supported by the National Natural Science Foundation of China(Grant Nos.52175224,52205262,52235005)。
文摘Accurate determination of inner wall temperature fluctuations is critical for thermal fatigue assessment in sodiumcooled fast reactors(SFR)piping systems,but remains inaccessible for direct measurement due to extreme operational conditions involving high temperature and chemical activity of liquid sodium.To overcome this challenge,this study proposes a self-adaptive Gaussian process regression(GPR)approach.The large eddy simulations(LES)of hot and cold liquid sodium mixing in T-junction pipes are conducted to quantify intense thermal-fluid interactions,revealing that inner wall temperature fluctuations are significantly higher than those at the outer walls.Building on these insights,we develop a self-adaptive GPR approach that integrates tree-structured composite kernel optimization with gradient-based hyperparameter tuning.The resulting approach accurately predicts inner wall temperature fluctuations using only outer wall measurements and corresponding operational parameters,achieving a predictive performance of determination coefficient R^(2)>0.95,and retaining robustness(R^(2)>0.75)even when trained on limited datasets.The proposed self-adaptive GPR approach offers non-intrusive,real-time thermal diagnostics for SFR piping systems,utilizing composite kernels that afford clear physical interpretability.Moreover,it provides a promising tool for safety monitoring in reactor cores,heat exchangers,and other nuclear components requiring high-fidelity thermal transient analysis.
