Blog

Happy Holidays 2018!

Wishing all of our customers and partners, past and present, an enjoyable Holiday Season 2018 and all the best in 2019!

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Multibody Dynamics for Vehicles

Over the past two years we have been involved in increasingly demanding Multibody Dynamics simulations for vehicles. The work has been within the parallel framework of conception, designing and developing a production vehicle with the resulting challenge of creating and validating models, understanding the underlying dynamics behavior enough to inform critical directional decisions, without diving into details that would add diminishing value to the program at early stages. More to come…

Multibody Dynamics - Vehicles

This model includes 3 masses, which the rear mass, the front mass, and the steering system. The degrees of freedom in this model are the same as Model#3 with addition of steering angle. Also, the rotational velocities of the wheels and their inertial effects have been considered in this model. It is assumed that the steering system has damping. The caster angle, \zeta, is also considered, in addition to an offset, e_s for the steering axis. These parameters will determine the caster angle and the trail in our design.  The developed model is a linear model, which assumes that the angles including roll angles and steer angle are small. Also, the terms with order higher than 1 resulting from multiplication of angles have been considered insignificant, and have been eliminated. The state space form of equations has also been developed. This state space form will be used for:
Simulations with low lateral accelerations
Developing of controllers
Eigenvalue analysis

Multibody Dynamics-Vehicles_2Acceleration(Z) - Curbstriking_15kmph

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NAFEMS Member

As part of our in-house capabilities and skills advancement program for employees, TSI Engineering is now a member of NAFEMS. This affiliation allows us to offer continuous improvement to our employees through training and experience sharing webinars, and a wealth of information and experience on everything from methods, to validation problems, to career/capability tracking. It also provides the platform for TSI to contribute to this field globally and to be recognized as experts in our field. We are continually pushing the boundaries of complex simulation and programs and resources such as those offered by NAFEMS is yet another tool that allows TSI and our partners to proceed with confidence in industry-leading innovations.

NAFEMS

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TSI Opens Our New Office!

TSI has a new home – back in great Town of Stouffville.  We opened our brand new facility in May 2016, and are now settled in and in full production.  This new new space allows us to increase our services significantly by expanding our lab and adding prototype fabrication capabilities.  We can now do in-house fabrication and assembly, 3D printing and testing.  All of this added to our upgraded servers and compute resources will help us do more and faster.

The new location is:

50 Innovator Avenue – Suite 11
Stouffville Ontario L4A 0Y2

Drop-by for a visit any time!

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TSI Labs helps our military with biomechanics and new product solutions!

TSI and our TSI-Labs venture together with Dr. Steve Fischer, and Queen’s University, have recently published findings of an in-depth project to understand and mitigate neck pain in military flight crews.  This significant problem has been affecting our women and men for many years.  In a matter of mere months, our team was able to get to the root of the biomechanical problem, develop prototype devices as short-term counter-meausures and evaluate their effectiveness in real-world conditions.  The results are very promising, and the ongoing work will one day lead to significant improvements in operational and everyday life for those that serve us.

Focused research – at the speed of business!

Find the paper in the Journal of Ergonomics here;

Evaluating a prototype device designed to alleviate night vision goggle induced neck strain among military personnel

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LS-DYNA modeling helps develop engineered cartilage

The Annals of Biomedical Engineering has published “The effect of moving point of contact stimulation on chondrocyte gene expression and localization in tissue engineered constructs.” , a paper by Jake Kaupp. Markus Hetzler and our Thumbprint Solutions team contributed advanced numerical modeling to help understand the behaviour of seeded agarose gel under cyclic loading.  This viscoelastic material is extremely complex, and we successfully developed and applied material model development techniques using numerical optimization to create and validate the material models.  Ultimately this work will help develop new materials for joints.

Agarose Strain

Strain history in cyclic loading of agarose gel

Thumbprint Solutions has been proudly supporting biomechanics research at Queens University and the Human Mobility Research Centre by supplying advanced simulation technology and custom test equipment development. Helping patient outcomes through core engineering.

Find the paper here:

The effect of moving point of contact stimulation on chondrocyte gene expression and localization in tissue engineered constructs.

 

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New Paper in JSES

The Journal of Shoulder and Elbow Surgery has recently published “Factors affecting the stability of reverse shoulder arthroplasty: a biomechanical study“, a paper by Allison Clouthier. Markus Hetzler of Thumbprint Solutions contributed as a second author as part of his own ongoing graduate studies.

Thumbprint Solutions has been proudly supporting biomechanics research at Queens University and the Human Mobility Research Centre by supplying advanced simulation technology and custom test equipment development. Helping patient outcomes through core engineering.

Find the paper here;
Factors affecting the stability of reverse shoulder arthroplasty: a biomechanical study

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Biomechanical Simulator for Queens University

TSI has recently released a biomechanical simulator to support cutting edge research at the Human Mobility Research Centre at Queens University in Kingston.

TSI's Multi-channel Simulator in the Lab

TSI’s Multi-channel Simulator in the Lab

Validation of the system using surrogate Sawbones™

Validation of the system using surrogate Sawbones™

Custom electronics developed by TS

Custom electronics developed by TSI

The test machine was developed to enable the research team to study the stability of prostheses, in this case a reverse shoulder arthroplasty.

TSI developed and supplied a fully integrated system, comprising of three series-elastic actuators, which reproduce the muscle forces, and a fourth actuator to apply external perturbations (dislocations) to the joint.  The four channels operate independently or coupled, using displacement and/or force control and have real-time tracking of the loads and position.

The system provides a high force fidelity, low impedance and excellent control bandwidth solution at a low overall cost.  It is powered by modular and expandable custom electronics hardware and controls software developed in-house by TSI, and most importantly, it has an intuitive, open-source interface.

Not only did we provide an effective physical solution, we provided a platform for innovation, allowing the team at Queens to focus their efforts on what is important – the research itself.

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TSI Achieves CGP Registration

TSI is pleased to announce that we are now registered with Canada’s Controlled Goods Directorate. As a CGP registered profession engineering firm, we look forward to bringing our unique and powerful blend of advanced simulation and design expertise to these vital new markets.

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Presentation on Robust Simulation

Markus Hetzler, P.Eng. of Thumbprint Solutions Inc. recently presented a training seminar on “Robust Simulation: Issues and Best Practices” at the Ontario SolidWorks Users Group Meeting in Toronto. Contact us for a copy of the presentation.

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