Systems Solutions Engineering
Dynamic Simulation allows Systems Solutions Engineers to analyze complex motion in assemblies. Loads caused by these motions can be used to feedback in to FEA so that we can use these loads to better design the part.
Below is a video that shows a parking pawl design. Parking pawls are used in automatic automobile transmissions to lock the driveshaft and prevent the vehicle form rolling downhill. They are governed by Federal Motor Vehicle Safety Standard (FMVSS) 105. Critical criteria of this standard are that the parking pawl must not become engaged when activated until the vehicle reaches a speed of less than 5 mph. While parking pawls are simple devices, their design details and their ability to impact the 5 mph engagement speed are critical. Design details include the spacing between the cogs in the wheel, length of the pawl foot, angle of the sides of the interfacing parts, radius of the tips of the interfacing parts, activating spring load, distance between components, friction between the components, etc. By the way, this system has to operate in the same manner over this life of the vehicle! Until dynamic simulation came along, the only way to design this system was hand calculations and trial and error which took a considerable amount of time.
In order to design a parking pawl using dynamic simulation, we solid model the pieces with a best estimation of the dimensions. Once the pieces are designed, we add constraints and motion to these pieces that simulate the real vehicle. In our case, we started the wheel rotating at 50 rpm and decreased the rotational speed to 0 rpm over 5.2 seconds to determine when the pawl dropped in to the wheel. Once we have the basic design operational, we can change dimensions and other inputs to see their effect on the stopping speed. Of course, with all good computer programs, we get reams of data of all the forces, velocities, accelerations, etc.
Check out the video below and see how the parking pawl components react as the wheel slows over time.
Below is a video that shows a parking pawl design. Parking pawls are used in automatic automobile transmissions to lock the driveshaft and prevent the vehicle form rolling downhill. They are governed by Federal Motor Vehicle Safety Standard (FMVSS) 105. Critical criteria of this standard are that the parking pawl must not become engaged when activated until the vehicle reaches a speed of less than 5 mph. While parking pawls are simple devices, their design details and their ability to impact the 5 mph engagement speed are critical. Design details include the spacing between the cogs in the wheel, length of the pawl foot, angle of the sides of the interfacing parts, radius of the tips of the interfacing parts, activating spring load, distance between components, friction between the components, etc. By the way, this system has to operate in the same manner over this life of the vehicle! Until dynamic simulation came along, the only way to design this system was hand calculations and trial and error which took a considerable amount of time.
In order to design a parking pawl using dynamic simulation, we solid model the pieces with a best estimation of the dimensions. Once the pieces are designed, we add constraints and motion to these pieces that simulate the real vehicle. In our case, we started the wheel rotating at 50 rpm and decreased the rotational speed to 0 rpm over 5.2 seconds to determine when the pawl dropped in to the wheel. Once we have the basic design operational, we can change dimensions and other inputs to see their effect on the stopping speed. Of course, with all good computer programs, we get reams of data of all the forces, velocities, accelerations, etc.
Check out the video below and see how the parking pawl components react as the wheel slows over time.
Dynamic Simulation
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