scholarly journals Development of measuring system for jaw movement with six degrees of freedom motion in rodents

2016 ◽  
Vol 23 (1) ◽  
pp. 32-33
Author(s):  
Emi Moriuchi ◽  
Tomoko Yoshimi ◽  
Ayumi Fujishita ◽  
Aya Nakamura ◽  
Ryo Hamanaka ◽  
...  
Keyword(s):  
Degrees Of Freedom ◽  
Measuring System ◽  
Jaw Movement ◽  
Six Degrees Of Freedom

scholarly journals A Gyro-Free System for Measuring the Parameters of Moving Objects

2014 ◽  
Vol 14 (5) ◽  
pp. 263-269 ◽  
Author(s):  
Dimitar Dichev ◽  
Hristofor Koev ◽  
Totka Bakalova ◽  
Petr Louda
Keyword(s):  
Degrees Of Freedom ◽  
Moving Objects ◽  
Measuring System ◽  
Measurement Channel ◽  
Measuring Instruments ◽  
Additional Measurement ◽  
Free System ◽  
Six Degrees Of Freedom ◽  
Measurement Concept

Abstract The present paper considers a new measurement concept of modeling measuring instruments for gyro-free determination of the parameters of moving objects. The proposed approach eliminates the disadvantages of the existing measuring instruments since it is based, on one hand, on a considerably simplified mechanical module, and on the other hand, on the advanced achievements in the area of nanotechnologies, microprocessor and computer equipment. A specific measuring system intended for measuring the trim, heel, roll, and pitch of a ship has been developed in compliance with the basic principles of this concept. The high dynamic accuracy of this measuring system is ensured by an additional measurement channel operating in parallel with the main channel. The operating principle of the additional measurement channel is based on an appropriate correction algorithm using signals from linear MEMS accelerometers. The presented results from the tests carried out by means of stand equipment in the form of a hexapod of six degrees of freedom prove the effectiveness of the proposed measurement concept

Development of a middle-range six-degrees-of-freedom system

2009 ◽  
Vol 224 (4) ◽  
pp. 679-688 ◽  
Author(s):  
W Jywe ◽  
Y-R Jeng ◽  
C-H Liu ◽  
Y-F Teng ◽  
C-H Wu ◽  
...  
Keyword(s):  
Degrees Of Freedom ◽  
Rotation Angle ◽  
Linear Displacement ◽  
Measuring System ◽  
Flexible Structure ◽  
Successful Development ◽  
Flexible Bodies ◽  
Six Degrees Of Freedom ◽  
Middle Range ◽  
Series Of Experiments

This paper describes the successful development of a middle-range six-degrees-of-freedom stage, using the features of a flexible structure. The system includes two parts: a middle-range positioning X— Y stage and a four-degrees-of-freedom stage. The flexible structure of the four-degrees-of-freedom stage is built from two kinds of flexible bodies: circular hinges and a new two-degrees-of-freedom flexible body. The four-degrees-of-freedom stage was designed to compensate movement errors including linear displacement, pitch, and roll errors. The linear displacement reaches 20 mm along the X-axis, 20 mm along the Y-axis, and 5 μm along the Z-axis. The rotation angle around the X-axis (θ x), Y-axis (θ y), and Z-axis (θ z) were all 10 arcsec. A novel six-degrees-of-freedom measuring system was also designed. Precision feedback control is demonstrated in a series of experiments performed using the proposed measurement system.

scholarly journals Individual mandibular movement registration and reproduction using an optoeletronic jaw movement analyzer and a dedicated robot: a dental technique

2020 ◽  
Vol 20 (1) ◽  
Author(s):  
Massimo Carossa ◽  
Davide Cavagnetto ◽  
Paola Ceruti ◽  
Federico Mussano ◽  
Stefano Carossa
Keyword(s):  
Degrees Of Freedom ◽  
Reference Points ◽  
Production Costs ◽  
Mandibular Movement ◽  
Time Saving ◽  
Additional Advantage ◽  
Jaw Movement ◽  
Six Degrees Of Freedom ◽  
Motion System ◽  
Occlusal Surfaces

Abstract Background Fully adjustable articulators and pantographs record and reproduce individual mandibular movements. Although these instruments are accurate, they are operator-dependant and time-consuming. Pantographic recording is affected by inter and intra operator variability in the individuation of clinical reference points and afterwards in reading pantographic recording themselves. Finally only border movements can be reproduced. Methods Bionic Jaw Motion system is based on two components: a jaw movement analyzer and a robotic device that accurately reproduces recorded movements. The jaw movement analyzer uses an optoelectronic motion system technology made of a high frequency filming camera that acquires 140frames per second and a custom designed software that recognizes and determines the relative distance at each point in time of markers with known geometries connected to each jaw. Circumferential modified retainers connect markers and do not cover any occlusal surfaces neither obstruct occlusion. The recording process takes 5 to 10 s. Mandibular movement performance requires six degrees of freedom of movement, 3 rotations and 3 translations. Other robots are based on the so-called delta mechanics that use several parallel effectors to perform desired movements in order to decompose a complex trajectory into multiple more simple linear movements. However, each parallel effector introduces mechanical inter-component tolerances and mathematical transformations that are required to transform a recorded movement into the combination of movements to be performed by each effector. Bionic Jaw Motion Robot works differently, owing to three motors that perform translational movements and three other motors that perform rotations as a gyroscope. This configuration requires less mechanical components thus reducing mechanical tolerances and production costs. Both the jaw movement analyzer and the robot quantify the movement of the mandible as a rigid body with six degrees of freedom. This represents an additional advantage as no mathematical transformation is needed for the robot to reproduce recorded movements. Results Based on the described procedure, Bionic Jaw Motion provide accurate recording and reproduction of maxillomandibular relation in static and dynamic conditions. Conclusion This robotic system represents an important advancement compared to available analogical and digital alternatives both in clinical and research contexts for cost reduction, precision and time saving opportunities.

scholarly journals Dynamics of the Human Masticatory System

2002 ◽  
Vol 13 (4) ◽  
pp. 366-376 ◽  
Author(s):  
J.H. Koolstra
Keyword(s):  
Degrees Of Freedom ◽  
Center Of Gravity ◽  
Anatomical Structures ◽  
Jaw Movement ◽  
Six Degrees Of Freedom ◽  
Lower Jaw ◽  
Movement Characteristics ◽  
Hinge Axis ◽  
Masticatory System ◽  
The Individual

In this review, the movement characteristics of the human masticatory system are discussed from a biomechanical perspective. The discussion is based upon the three fundamental laws of mechanics applied to the various anatomical structures that are part of the masticatory system. An analysis of the forces and torques applied to the mandible by muscles, joints, articular capsules, and teeth is used to assess the determinants of jaw movement. The principle of relating the interplay of forces to the center of gravity of the lower jaw, in contrast to a hinge axis near its joints, is introduced. It is evident that the muscles are the dominant determinants of jaw movement. The contributions of the individual muscles to jaw movements can be derived from the orientation of their lines of action with respect to the center of gravity of the lower jaw. They cause the jaw to accelerate with six degrees of freedom. The ratio between linear and angular accelerations is subtly dependent on the mass and moments of inertia of the jaw, and the structures that are more or less rigidly attached to it. The effects of articular forces must be taken into account, especially if the joints are loaded asymmetrically. The muscles not only move the jaw but also maintain articular stability during midline movements. Passive structures, such as the ligaments, become dominant only when the jaw reaches its movement boundaries. These ligaments are assumed to prevent joint dislocation during non-midline movements.

Vehicle Ride Quality and Passenger Comfort

1978 ◽  
Vol 22 (1) ◽  
pp. 116-116
Author(s):  
Larry G. Richards ◽  
Ira D. Jacobson
Keyword(s):  
Degrees Of Freedom ◽  
State Of The Art ◽  
Measuring System ◽  
Ride Quality ◽  
Limited Data ◽  
Noise Levels ◽  
Six Degrees Of Freedom ◽  
Marine Vehicles ◽  
Roll Rate ◽  
Temperature And Pressure

The state of the art in ride quality assessment is reviewed. A portable environmental measuring system (PEMS II) has been developed to simultaneously record variation in motion (in all six degrees of freedom), temperature and pressure for various segments of a ride. The results of extensive studies of passenger reactions to diverse vehicles are presented as a set of models relating human comfort ratings to environmental conditions, vehicles studied include aircraft (commuter planes, S-61 helicopter, Boeing 747, Concorde), trains (conventional and special purpose), buses, and cars. Limited data are available on marine vehicles. Models for aircraft involve vertical and lateral accelerations and noise levels; while models for ground based vehicles also involve roll rate.

OKAS-3D: optoelectronic jaw movement recording system with six degrees of freedom

1995 ◽  
Vol 33 (5) ◽  
pp. 683-688 ◽  
Author(s):  
M. Naeije ◽  
J. J. Van der Weijden ◽  
C. C. E. J. Megens
Keyword(s):  
Degrees Of Freedom ◽  
Recording System ◽  
Jaw Movement ◽  
Six Degrees Of Freedom

scholarly journals Diagnostic Parameters of Six Degrees of Freedom Jaw Movement for the Stomatognathic Function.

1993 ◽  
Vol 37 (4) ◽  
pp. 761-768 ◽  
Author(s):  
Ryutaro Ueda ◽  
Eiichi Bando ◽  
Masanori Nakano ◽  
Atsushi Suzuki ◽  
Tetsuya Fujimura ◽  
...  
Keyword(s):  
Degrees Of Freedom ◽  
Jaw Movement ◽  
Six Degrees Of Freedom ◽  
Diagnostic Parameters

Development of a laser-based high-precision six-degrees-of-freedom motion errors measuring system for linear stage

2005 ◽  
Vol 76 (5) ◽  
pp. 055110 ◽  
Author(s):  
Chien-Hung Liu ◽  
Wen-Yuh Jywe ◽  
Cheng-Chung Hsu ◽  
Tung-Hui Hsu
Keyword(s):  
High Precision ◽  
Degrees Of Freedom ◽  
Measuring System ◽  
Linear Stage ◽  
Six Degrees Of Freedom
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