Boats and waves. This is a very easy way to simulate the effect to different waves on the durability of floating structures. https://lnkd.in/gE6x_2VM
MingYao Ding’s Post
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What is a mode shape ? mode shape is the deformation that the component would show when vibrating at the natural frequency. The terms mode shape or natural vibration shape are used in structural dynamics. A mode shape describes the deformation that the component would show when vibrating at the natural frequency. #Engineering #EngineeringLife
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Dynamic Analysis
What is a mode shape ? mode shape is the deformation that the component would show when vibrating at the natural frequency. The terms mode shape or natural vibration shape are used in structural dynamics. A mode shape describes the deformation that the component would show when vibrating at the natural frequency. #Engineering #EngineeringLife
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When designing #gears, the scuffing and pitting load capacity must be verified. The verification is generally carried out according to standard. All standards assume simplifications for the calculation of scuffing and pitting load capacity. A transient 3D TEHD #simulation provides detailed results for contact pressure, temperature, frictional shear stress, stress at the surface and subsurface and other information for every point of the path of contact. This makes it possible to design gear teeth more specifically or to develop extended or new models for the calculation of scuffing and pitting load capacity, which allow a much more accurate calculation than according to currently standard. You want to optimize your gearing of spur, helical or bevel gears tribologically, but do not want to do it yourself? Contact us! #development #automotiveindustry #engineering #lubrication #tribology
TEHD and Stress Simulation of a Spur Gear with Tribo-X
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Helical thermowells are excellent at reducing force on the thermowell due to vortex shedding. This design enhances stability and minimizes potential vibrations caused by aerodynamic forces. #helical #macweld #oilandgasindustry #refineryindustry
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Chief designer at Southwell Yacht Design. Consults in advanced Grasshopper development & design workflow optimisation.
The HullZero module for generating planing hulls, from two surfaces and an edge, is ready for testing. You can now add steps, chines and transom cutouts. Adding a coachroof is also easy with the superstructure module. And lets not forget it's parametric, so at any stage you can go back and change dimensions, fairing curves or cutouts. I like it because you can create 10 versions in a day. Test them using CFD, get weights and costings and then generate mold cutting sheets by tea-time. We will begin Beta testing next month. #parametricdesign #parametricarchitecture #yachtdesign #navalarchitecture #computationaldesign #
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Armament Engineer ( Metallurgist), Automobile Engineer, Project Planning, Administration, Omnia Fasimus
Topology Optimization and Lattice Structure Generation: Two Approaches for Optimal Mechanical Design and their Case Studies Submitted in partial fulfillment of the requirements Anyone can bring more insights on it
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Mechanical Design Engineer | NIT Calicut Postgraduate | Enthusiastic about FEM, Simulation, and Analysis
Bird strike, or bird ingestion, involves a bird colliding with an aircraft, particularly with critical components like jet engine blades. This can lead to engine damage, structural issues, and significant economic costs. Notable incidents include A20N in Atlantic City (2021), A333 near Orlando (2013), and B752 in Denver (2011). Motivated by the severe impacts of such incidents, my teammate Ashok Vardhan and I undertook the project "IMPACT ANALYSIS OF BIRD STRIKE ON JET ENGINE BLADES" under Dr. Vineesh KP’s guidance as part of the Applied Finite Element Analysis(AFEA) course. We used Ansys LS-Dyna software, referencing a research paper on bird strike impacts, and aimed to compare our simulation results with those documented in the research paper, seeking to provide suitable explanations for any observed disparities. To perform a meticulous analysis of bird impacts on jet engine blades using Ansys LS Dyna software, we followed a comprehensive methodology. Firstly, we imported the geometry in .iges file format with units in the MKS unit system. The propeller geometry was meshed using a tetrahedral mesh, while the bird geometry was meshed using SPH particles. The bird model was established as a gelatin material, and its geometry was anticipated. As most bird strikes transpire during take-off and landing, the bird was modelled with a set velocity of 120 m/s and impacted on the engine blades. We then translated the entire geometry with the propeller nose as the origin point and defined a shell at the center of the propeller geometry, naming it the inner hub. Each part was numbered for clarity. Material properties for the turbine were defined using the Johnson-Cook material model with failure constants, while the bird's material properties were defined using the SPH material model. The engine blades were modelled as a tetrahedron mesh for accuracy and were rotating at 200 rad/s counter-clockwise. Constraints and interactions were meticulously defined, along with the initial conditions necessary for the simulation. After running the simulation, we thoroughly analyzed the results, manifesting as effective stresses, to assess the structural damage and deflection induced by the bird impact. After running simulations and analyzing results, we noted differences in results, due to propeller model disparities and bird motion starting points. Completing this course project under guidance of Dr. Vineesh KP and my teammate Ashok Vardhan was enriching. I gained hands-on experience with LS-DYNA and learned about the Johnson-Cook material model, a crucial failure model. Additionally, I developed skills in modeling objects like birds using the SPH material model. Special thanks to Dr. Vineesh KP for his constant support and invaluable insights and Suhail P sir for his advice, especially during the initial phase of importing a model into LS-DYNA. This project significantly enhanced my understanding of AFEA and its real-world applications.
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Continuing from my previous post, acoustic pressure usually originates from pressure-reducing devices handling high-pressure drops and flow-rate. These acoustics induce vibrations in the pipe wall, particularly in the 500–2500 Hz frequency range where most energy is concentrated. The resulting vibration mode causes radial displacement in the pipe, leading to fatigue failures at stress concentration points such as pipe fittings and welded supports. The initial step in analysis involves calculating the modal basis within the frequency range of interest using a detailed FEA model. The animation below illustrates a typical mode of a weldolet connection pipe (a type of pipe fitting) at very high frequencies (above 1000 Hz). We have developed a method to simulate the coupling between the acoustic mode of the fluid and the structural mode of the pipe in order to calculate the fatigue life of the weld.
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I am thrilled to share that our latest paper, "A model for modifying the S-N curve considering the effect of boundary conditions on the fatigue crack growth of welded components” has been published in the journal of Fatigue & Fracture of Engineering Materials & Structures. This work represents a significant step forward in our understanding of how boundary conditions affect fatigue crack growth in structures. In this research, we introduce a groundbreaking model that modifies the master S-N curves of components by accounting for their load redistribution capability under different boundary conditions, employing fracture mechanics analysis. Through a comprehensive investigation utilizing discrete 3D fatigue crack growth simulation, we discovered the significant impact of boundary conditions on crack growth behavior and subsequent fatigue life. We then applied our model to the S-N curve of a T-welded joint. We believe that our model offers more accurate fatigue life prediction, which is vital for reducing operation and maintenance costs by optimal design and for more economically predictive inspection planning. I would like to express my gratitude to Martin Alexander Eder, Alexander Michel, Weijian Wu for their invaluable contributions and insights. Our work is accessible via the following link: https://lnkd.in/eSbwQ-Yq #Fatigue #crack #Fracture_mechanics #FEA #SN_curve #welded_joint #design
A model for modifying the S‐N curve considering the effect of boundary conditions on the fatigue crack growth of welded components
onlinelibrary.wiley.com
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SHADOWGLIDE™ Using calculated geometry and expert engineering the sliding mechanism works in complete harmony to open or close your umbrella in 5 seconds.
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