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Gloves with Bending Sensors Made of Strain Gauges for Deformation of Freeform Surfaces
|關鍵字:||Freeform surface;自由曲面;shape deformation;virtual reality;virtual gloves;bending sensor;stain gauge;變形控制;虛擬實境;虛擬手套;彎度感測器;應變規||出版社:||機械工程學系||摘要:||
The purpose of this research is to make a virtual glove with 16 degrees of freedom (DOF) of bending. The bending variation of each DOF is sensed by a bending sensor which is made of strain gauges. Through the bending sensors, the signals of movements of fingers and the wrist can be captured and transmitted to the computer. According to the information, the surface control points thus can be moved to control the deformation of the corresponding freeform surfaced solid model.
The virtual glove is mounted with bending sensors for finger actions of proximal inter-phalangeal joints, metacarpal-phalangeal joints, and abduction/adduction angles, and the wrist. The bending sensors, composed of strain gauges, detect the corresponding actions of each part of the hand and produce different resistance values for different bending variations. The branch voltage of Wheatstone bridge is extracted and amplified to a desired range through an OP amplifier. The analogue signal of the bending action is transmitted to a A/D digital-analog signal converting card in the PCI interface of the computer to be converted to a digital signal. The digital signal is stored in an allocated addressed memory to be accessed by an operational interface.
An operational interface is used to select surface and control points of the solid model. After a control point is being selected, the three basis position vectors are subjected to change responding to the three joint bending variations of a finger. The bending of the proximal joint makes a change to the normal vector of freeform surface. The bending of the metacarpal-phalangeal joint and adduction/abduction move the point along the two independent directions on the tangent plane. The 3D position changes of control points respond to the changes of the finger bendings and adduction/abduction, such that the shape of control of a complicated surface can be manipulated through the finger movements in real time.
Key Words: Freeform surface, shape deformation, virtual reality, virtual gloves, bending sensor, stain gauge
|Appears in Collections:||機械工程學系所|
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