Dynamic Analysis

Most simulations of motion begin with kinematics. In our engineering services practice we start with a mechanism that gives you the motion you want. But in order to make that motion happen in the real world you need to be able to drive it. Dynamic simulations allow engineering services professionals to figure out how much force it takes to make a mechanism work. In addition we can learn what reaction loads are generated in each of the moving components so that they can be appropriately designed.

One of our most interesting dynamic analysis engineering projects to date came from a pain management device for dental injections. Although making something vibrate in general is straight forward, it turns out to be quite complicated to control that vibration. The challenge with the dental vibrator was to ensure that the frequency and amplitude of vibration were correct not when held in your hand but when actually used in a patient’s mouth.

To capture all the necessary behavior in our dynamic analysis we had to simulate every moving part from the motor, through the drive system down to the tip. In order to achieve the high frequencies that our client was looking for, we had to engineer a mechanism with natural frequency equal to the resonant frequency of the system. Given this fact rigid body approximations were not valid for all of the components. We ended up using finite element analysis in our engineering services to replace certain flexible components with springs and masses in our dynamic analysis.

The end result was a system with fewer moving parts that we had originally thought of since we could take advantage of the elastic behavior of certain components. This ultimately lead to product that was able to produce the desired vibration with lower than expected manufacturing costs. We’re always striving to achieve these kinds of results though our engineering services and analysis is an invaluable tool.

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