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What have engineers learned about Fluid-Structure Interaction from the Tacoma Narrows bridge collapse?

This week marks the anniversary of the famous collapse of the Tacoma Narrows Bridge on Nov 7, 1940 - just 4 months after it was opened (at the time it was the third-longest suspension bridge in the world - based on main span length).   As engineers, we've all seen this video from our engineering degrees and for many it remains a vivid reminder of the devastating potential of forced harmonic resonance on a light structure - noting particularly that this bridge collapse occurred during relatively normal speed winds (of just 68 km/hr) which unexpectedly produced aeroelastic flutter that matched the bridge's natural frequency. This resonance in turn led to movement and deformation of the bridges girder and supporting structures such that the cables eventually exceeded their...

Simulation & Additive Manufacturing: letting all your wildest (product design) dreams come true in front of your eyes

At LEAP we have been tracking the development of additive manufacturing (AM, aka 3D printing) very closely for the past decade, and we have no doubt that if you’re an engineer or product designer who has been waiting for that ‘tipping point’ in capability/cost in AM, that now is the best time to get started. We are in the midst of running a series of series with Emona and Markforged here in Australia during October, with events in Melbourne, Sydney (morning & afternoon sessions) and Adelaide – if you’re interested, click on the city name for registration details. But first let’s recap why CAD/CAE and simulation are such a perfect match for product designers and engineers who are also getting started with AM: Topology Optimisation...

Engineers need an integrated Simulation toolset to develop and optimise safe autonomous systems

Learn how ANSYS’ integrated toolset can overcome the complex technical challenges in the development of fully autonomous systems: helping to deliver safe and reliable systems that operate efficiently in complex, changing environments. As engineers, we intuitively understand that comprehensive simulation is the only way to thoroughly consider all real-world scenarios for these systems in a fast and cost-effective way.

Crash Simulation of the Waterfall Train Disaster

On 31 January 2003, a four car Tangara passenger train G7 on run from Sydney Central railway station to Port Kembla derailed about 2 kilometres south of Waterfall railway station. The train driver and six passengers were killed and many passengers suffered serious injuries. Following the accident considerable media coverage was given to speculation concerning its cause. Numerous causes were canvassed and discussed in numerous media reports. The possible causes mentioned ranged far and wide. They included: problems with the track, excessive speed, poor maintenance, inadequate safety management, alleged prior mechanical problems which allegedly caused a surge in traction power, modification to a faster AC traction motor, motor power failure, brake failure, human error, the health of the train driver, mechanical failure, power surge when...

From fatigue failure to EMI/EMC: the vast range of FEA and Emag applications in the Rail industry

ANSYS: Extracting the parasitic effects from a 3D package geometry
As your train rumbles along during your morning commute, you are more likely to be hooked to your smartphone than thinking of all the types of simulations that have gone into making your journey safer and provided a more comfortable ride (though unfortunately they still can’t help with that odour coming from one of your riding companions!). Engineers working in the rail industry will recognise the expanding use cases of FE and Emag simulations that are now undertaken on a routine basis in the development of new systems: from the design of individual components, sensors and actuators, to fatigue of structural members and critical components such as wheels, axles, bogies; through to the creation and certification of safety-critical software code: engineering simulation tools are now...

Dramatic Accelerations in the Performance of Antenna Placement and Co-site Interference Simulations with NVIDIA GPUs

Figure 1 - Radiation pattern of a ship calculated in ANSYS HFSS SBR+
After talking to design engineers who are responsible for both Antenna Placement and Co-site Interference simulations, we have heard that they typically desire results to be available in less than 10 minutes in order for them to effectively test all the different configurations required on a real-world project. If the simulation time grows beyond 10 minutes, then they consider that the number of design scenarios which can be analysed in a given working day becomes detrimental to their design process. In the past, this has been problematic for companies wanting to adopt simulation technology as antenna placement type problems will typically have enormous domain sizes and the types of geometry involved can rapidly escalate the difficulty of analysis. The first example presented here involves the...

Addressing the complex design challenges of composite parts using ANSYS Composite PrepPost (ACP)

Static Structural analysis results in ANSYS
It is well known that, compared to traditional materials, the fabrication of structures using composite materials offers clear benefits when designing high-performance products that require extreme strength and stiffness, combined with lower weight. However, the use of composite materials also presents additional challenges, as their mechanical properties are heavily influenced by loading direction and their brittle nature makes fracture a very serious possibility for poorly designed components. The ANSYS Composite PrepPost (ACP) suite has been specially designed to address these unique complexities of composite materials and aid engineers in designing high performance and safe components. This blog will follow the design and analysis of a composite wheel hub commonly used in high performance consumer and race cars. The fabrication of composite structures is based on...

Using ANSYS SpaceClaim for reverse engineering: how to handle faceted data in your modelling process

Optimised STL Clean-Up in ANSYS SpaceClaim

ANSYS SpaceClaim makes working with STL data easy, enjoyable, and accessible to every engineer. Whether you’re reverse engineering a model in preparation for simulation; or you’re cleaning up a model ready for 3D printing, see how the faceted data toolkit becomes an invaluable addition to your engineering workflow.

Moving towards a Comprehensive Virtual PCB Testing Platform

ANSYS Simulation results for Printed Circuit Boards (PCBs)

Trends such as such as Industry 4.0, the Internet of Things (IoT), drones, smart home technology and autonomous vehicles are continuing to push PCB technology to its limits. Electronics engineers are now needing to focus on more than just the electromagnetics aspects of PCB design, and are increasingly concerned about power consumption, thermal & vibration issues linked to reliability concerns in harsh environments.

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