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But, there is no method for determining blankholder force trajectory.
Key issues in process control include process controller and reference punch force trajectory design.
Process control can be used to adjust the blank holder force in-process based on tracking a reference punch force trajectory to improve part quality and consistency.
The purpose of this paper is to present a systematic approach to the design and implementation of a suitable process controller and an optimal reference punch force trajectory.
The approach includes modeling of the sheet metal forming process, design of the process controller, and determination of the optimal punch force trajectory.
The instruction session consisted of visual demonstration of the critical anatomic structures only, and the instructor refrained from any physical guidance with the students' intended to modify their laryngoscope grasp, lifting force trajectory, or intubating positions.
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Inertial stabilization is achieved by modifying the contact force trajectories.
Kinematic and force trajectories are often normalized in time, with mean and variance summary statistic trajectories reported.
The aim of this paper is to describe the capabilities of variable blank holder force trajectories to improve the distribution of wrinkles and the quality of 3D-structures.
The introduced force trajectories lead to a significantly improved visual quality increasing the initial height where wrinkles occur encouraging fibre to fibre movement at the beginning of the process.
Figure 4A compares average force trajectories for several different targets, aligned with respect to the onset of force under FES (red curves) and normal (black curves) conditions.
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