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Animals and plants have numerous active protections for adapting to the complex and severe living environments, providing endless inspiration for extending the service life of materials and machines. Conch, a marine animal living near the coast and chronically suffering from the erosion of sand in water, has adapted to the condition through its ant...
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Context 1
... the multi-source coupling bionics idea, the conch convex hull structure, the romanesco broccoli fractal structure, and the pine cone spiral are integrated into the valve core. As a result, CAD modeling was built using Siemens NX 10.0 software (Siemens Product Lifecycle Management Software Inc., Plano, TX, USA), as shown in Figure 6. ...
Context 2
... shown in Figure 6 and Table 3, the fifth and sixth layers of the second-dimensional convex hull have a maximum diameter of 0.5 mm. The third-dimensional convex hull on the second is 0.01 mm, which is beyond the scope of human vision. ...
Context 3
... the multi-source coupling bionics idea, the conch convex hull structure, the romanesco broccoli fractal structure, and the pine cone spiral are integrated into the valve core. As a result, CAD modeling was built using Siemens NX 10.0 software (Siemens Product Lifecycle Management Software Inc., Plano, TX, USA), as shown in Figure 6. ...
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Due to the complexity of the working conditions and the diversity of application scenarios, the normal operation of a fan, whether volute tongue, volute shell surface, or blade, often encounters some unavoidable problems, such as flow separation, wear, vibration, etc.; the aerodynamic noise caused by these problems has a significant impact on the n...
Citations
... The NSGA-II algorithm was used to optimize the structural parameters of the bionic valve, and the field synergy principle was used to evaluate the flow field optimization of the bionic valve. Wang [6] proposed a new method to combine the advantages of animals (functional bionics) and plants (shape bionics). Combined with the convex dome on the conch shell and the fractal structure of cauliflower, a new type of water hydraulic valve core structure was designed to improve the particle erosion resistance of the valve core. ...
A valve seat structure with some bionic drainage of the regulating valve was designed which is inspired by the cuttlefish. The development and collapse of cavitation flow in the valve with this bionic valve seat was investigated with numerical simulation, experimental measurement and theoretical analysis. The influence of bionic drainage valve seat on the internal cavitation development and the distribution of three-dimensional cavitation morphology was also fully discussed. The results show that the bionic drainage hole structure destroyed the distribution law of the cavitation ring in the flow channel, and accelerated the collapse of the cavitation flow which mainly concentrates on the inner surface of the valve seat. Furthermore, the bionic drainage hole structure causes the vortex structure to break into smaller vortices during the cavitation collapse stage under the shear effect, so the cavitation bubble is dissipated in the form of smaller vortex breaking finally. The results provide a significant reference for optimum structural design of the regulating valve in the coal liquefaction project.
... The opening greatly affect the ow area, dynamic ow and pressure characteristics [17] . The opening of different valve core shapes, such as V-shape [8] , S-shape [18] , sphere-shape, circular-shape, pyramid-shape, ellipsoid-shape [19] , circular-cone-shape [5] and Bio-inspired-shape [20] ,etc, has been focus in literature. The present reported value commonly has one throttling channel, while there are two throttling channels when the uid ows to the valve core seat of the NWU backpressue valve, as shown in Fig. 9. ...
High performance backpressure valve is critical for the high-pressure fluid control technology. However, the back pressure easily suffers mechanical failure caused by the strong fluid flushing when the back pressure up to 30 MPa. This work used computational fluid dynamics and solid mechanics analysis method to analyze the basic flow and resistance characteristics of a recently developed backpressure valve. The inlet pressure, maximum flow rate, and maximum turbulent kinetic energy of the 2-30MPa backpressure valve decreases with the increasing the valve opening were analyzed in details. There is pressure suppression phenomenon in the valve chamber when the valve opening is less than 6 mm. The fluid-solid coupling results show that the existing structure of the flow channel and valve core seat can satisfy the pressure regulation requirements within the strength range, and the structure of ball spool seat improve the pressure regulation ability.
... It is known that creatures in nature (plants and animals) are exposed to particle erosion in variable directions. For this reason, bio-inspired textures could be the most suitable solutions to create effective surfaces exposed to particle erosion in variable directions [1,7,9,11,[25][26][27][28][29]. ...
The effect of surface texture on the tribological properties of materials is one of the most popular topics. Because of their disadvantages, numerous studies were done to upgrade the erosive wear resistance of polymeric materials. To understand the surface textures and their orientations effect on particle erosion behavior of polymeric materials, the geometry of surface textures and their different orientations were investigated. Square prismatic textures were printed on the ABS polymer surface using a 3D printing technique. As a function of the particle flow direction, changes in particle erosion rates of the surface textures and their orientations were examined. It was understood that the surface textures, which are oriented perpendicular to the particle flow direction, are the most effective structures. However, it was demonstrated that the orientation of the surface textures is as important as the geometry of the surface textures if the object would be exposed to particle erosion under variable particle flow directions.
... The ribbed structures could reduce erosion at the elbow by approximately 31.4% [17]. Recently, the erosion resistance of bionic convex domes [18], coupling bionic sample of Laudakia stoliczkana [19], and the convex domes on the conch shell [20] have been investigated, aiming to provide ideas for the design of the surface microstructure. Bai et al. [21] found that the V-shape bionic coating of helicopter rotor blades had better resistance to solid particle erosion. ...
The fabrication of microstructures on surfaces is an innovative approach to relieve slurry erosion. Understanding the effect of the dimensions of the surface microstructure on slurry erosion can inspire new surface treatments, not only for small flow-handling parts but also for large water conservancy facilities. Our previous work has studied the effect of the micro structure's shape on slurry erosion. As an extension, the dimension was investigated based on the selected groove structure. Five V-shaped grooved surface microstructures (V1–V5) with different depths (1–5 mm, respectively) were designed. The effect of groove depth on erosion was studied by scanning electron microscopy observation and mass loss, roughness, and residual stress measurements at a slurry speed of 8.29 m s⁻¹, particle size of 75–150 mesh, and sand concentration of 3 wt%. The results showed that the best erosion resistance occurred at a critical depth of 3 mm. This was partially due to the low-velocity component in the flow direction and the upward velocity component perpendicular to the flow direction. This velocity distribution inhibited the impingement erosion of the particles inside the groove and simultaneously slowed the incoming particles into the groove. The groove surfaces underwent the most severe erosion, while the top surfaces experienced less erosion, which was relieved by multiple vortices induced by the grooves. The erosion rates of V3, V4, and V5 were lower than those of V1 and V2. The erosion mechanisms are summarized to guide the design optimization of surface microstructures.
... And the spider's multi-stage and multi-target pressure regulating hydraulic systems are formed with the combination of different hydraulic bridges. According to the bioTRIZ [19], high levels of similarity between spider-legs' hydraulic system and engineering hydraulic bridge system were found. The basic unit of the pressure regulating system is segmented. ...
... And the relationship between the input current, i, and the output force, F, is F = −20.31 + 5.3i (19) According to the principle of force balance, The relationship between the forces exerted on the valve rod is ...
... To reduce the particle erosion resistance and improve the service life of the valve core, a novel valve core structure for a water hydraulic valve was designed, which was inspired by the convex domes of a conch shell and the fractal structure of Romanesco broccoli. The numerical and experimental results showed that the bionic structure could effectively improve the anti-erosion property of the valve core and protect the sealing face on the valve core from wear (Wang HH. et al., 2019). Researchers also focused on the cavitation in the sleeve-regulating valve and investigated the effects of different valve core shapes, including flat bottom, ellipsoid, circular truncated cone, and cylinder, on cavitation by using a cavitation model. ...
In this paper, the piston type valve core and the unbalanced moment on its bottom are studied. To decrease the influence of non-common geometrical factors, a simplified model of the piston type globe valve is proposed in this study. Based on the computational fluid dynamics (CFD) method, the effects of different geometrical parameters on the unbalanced moment existing on the bottom of the valve core, which include the bending radius of the inlet flow channel, the diameter of the special-shaped pipe, and the height of the valve core, are studied. Finally, the effects of geometrical parameters on the unbalanced moment on the bottom of the valve core are clarified by correction and variation classification and provide a basis for further optimizing the structure of the piston type valve. The results show that the unbalanced moment decreases with the increase of the bending radius of the inlet flow channel, but increases with the increase of the diameter of the special-shaped pipe and the height of the valve core. Moreover, the relation between the unbalanced moment and flow rate is proposed.
... e cavitation inception, development, and collapse in the flow passage will lead to pressure oscillation in the regulating valve, vibration, noise, early valve failures, and affecting the stability of the hydraulic system [1][2][3]. erefore, it is essential to understand thoroughly the complex flow characteristics inside the valve in order to improve the running safety of the regulating valve [4][5][6]. ...
A combined numerical-experiment investigation on the unsteady cavitation flow and pressure fluctuation characteristics in the regulating valves is conducted in this paper. The cavitation flow in the regulating valve is an unsteady and periodic flow which could be divided into fixed and travelling cavitation bubbles. The fixed cavitation bubbles are formed in the gap in the initial stage and then fell off and formed the travelling cavitation bubbles because of the re-entrant jet. The travelling cavitation bubbles move downstream, oscillate, and break up into several smaller bubbles. Changes in the length/radius ratio (L/R0) of the valve spool is an important factor affecting unsteady cavitation flow and pressure pulsation characteristics in the regulating valve. The length of travelling cavitation bubbles increases firstly and then decreases with increasing time. With the increase of the length/radius ratio (L/R0), the oscillation period of cavitation bubbles also increases. In the initial stage of cavitation bubbles, the velocity distribution inside the regulating valve is relatively stable, and no re-entrant jet could be found although L/R0 is different. In the collapse stage of cavitation bubbles, the velocity distribution becomes extremely unstable because the collapsing cavitation bubbles affect the pressure drop and velocity field in the flow channel. Furthermore, the amplitude of pressure pulsation increases gradually, and the peak time of the pressure pulsation is gradually delayed while increasing the length/diameter ratio.
... Comprehensive analysis shows that these protrusions, spirals, and non-smooth surface morphology can reduce the erosion of sediment. The outer shell of the conch is well protected against abrasion and erosion [53]. Similarly, buildings' structures sometimes get damaged by the salt in the air. ...
... Biological characteristics of a conch[53]. ...
In the Panama context, energy consumption in the building sector is mostly related to the conditioning of indoor spaces for cooling and lighting. Different nature strategies can be mimic to strongly impact these two aspects in the building sector, such as the ones presented here. A comprehensive analysis regarding literature related to biomimicry-based approaches destined to improve buildings designs is presented here. This analysis is driven by the increasing energy regulations demands to meet future local goals and to propose a framework for applications in Panama. Such biomimicry-based approaches have been further analyzed and evaluated to propose the incorporation of organism-based design for three of the most climate types found in Panama. Consequently, a SWOT analysis helped realized the potential that biomimicry-based approaches might have in improving the odds of in meeting the local and global regulations demands. The need for multidisciplinary collaboration to accomplish biomimicry-based-designed buildings, brings an increment in the competitivity regarding more trained human-assets, widening the standard-construction-sector thinking. Finally, the analysis presented here can serve as the foundation for further technical assessment, via numerical and experimental means.
... Many cases have been widely applied. For example, the anti-erosion properties of valve cores could be effectively improved, and the sealing face on valve cores can be protected from wear [16]. In the process of contradiction resolution using BioTRIZ, the increasing complexity of design problems in industry may result in a large number of involved contradictions [17]. ...
The impacts on the environment of many commercial products have not been fully considered in past years. For the sustainable development of Earth’s resources, future product design should move towards not only innovation, but also fundamentally in the green direction. Currently, the BioTRIZ method may provide a satisfactory solution for a single contradiction of green product design. However, if there are multiple contradictions existing due to multiple operational fields, difficulty in implementing design aspects may be posed. For this reason, this paper develops a BioTRIZ multi-contradiction resolution method targeting a green product design, which can find the crucial contradictions and thus achieve the necessary invention principles(IP). By summarizing the green factors and further dividing operational fields, the deduced matrix table becomes highly effective in the design. Accordingly, designers can be assisted to quickly find the operational fields under multiple contradictions. The effectiveness of the proposed method is verified using a product example of a window-cleaning robot design.
Several sources for excitation of high fluid pressure pulsation and hydraulic pipeline systems can produce pipeline system vibration failures due to overload in the engineering sector. This article is the study of pressure pulsation on two different hydraulic systems, simple and regenerated hydraulic systems. The pressure pulsation observed in both systems was different for the different loading conditions. Simple hydraulic systems reduced the frequency of pulsation with an increase in the load, and on the other side the regenerative system increases the pulsation frequency with an increase in load. This informs that at higher loading conditions the pressure pulsation attenuation will be difficult in the regenerative hydraulic system.
