Dipartimento d'Ingegneria

Zanetti Elisabetta

Zanetti Elisabetta

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Altre informazioni

  • Telefono
    0755853748
  • Ruolo
    Ricercatore - Research fellow
  • Area
    Bioingegneria - Biomedical engineering

A new device for 3D oral scanning has been designed and tested: it is a two channel PTOF (pulsed time-of-flight) laser scanner, designed for dental and industrial applications in the measurement range of zero to a few centimetres. The application on short distances (0–10 cm) has entailed the improvement of performance parameters such as single shot precision, average precision and walk error up to mm-level and to µm-level respectively.
The single-shot precision (σ-value) has resulted to range from 43 to 63 ps (9–10 mm), having considered the measurement range (6.5–10 mm) corresponding to 1–2 V signal; this result agrees well with estimates made from simulations. The average precision has resulted to be dependent on the number of measurements and can reach a value equal to ±25 µm, whenever the measurements frequency is sufficiently high. For example, if the required scanning speed is 1000 points/s and the required average precision is ±25 µm, then a pulses frequency of 30–50 MHz is needed, considering signal amplitude varying between 1–2 V.
On the whole, the performance of this new device, based on PTOF has proven to be adequate to its employment in the field of restorative dentistry.
by
Set up of a prescreening tool for vehicle front-end design, allowing numerically forecasting of the results of EC directive tests, with reference to pedestrian lower leg impact. 
A numerical legform model has been developed and certified according to EC directive. The frontal end of the vehicle has been simulated through a lumped-parameters model, having considered the predesign stage when the target overall behavior is being established. The stiffness behaviors of the bumper and of the spoiler have been estimated by means of more detailed numerical models.
A parametric analysis has been performed to outline the effects of bumper and spoiler stiffness, bumper vertical height, and the longitudinal distance between the spoiler and the bumper.
An analytical model has been introduced to predict tibial acceleration, knee shear displacement, and knee lateral bending, given the bumper and spoiler characteristics as input
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