Progresses on the Way to a Dynamic Model

2000 ◽  
Vol 44 (38) ◽  
pp. 872-875
Author(s):  
Heiner Bubb
Keyword(s):  
Experimental Data ◽  
Prediction Model ◽  
Dynamic Model ◽  
Motion Prediction ◽  
Visual Behavior ◽  
Maximum Torque ◽  
Gender And Age ◽  
Dynamic Forces ◽  
New Models ◽  
Posture Prediction

Anthropometric human models are useful especially when treating static layout problems. Animation tools normally are used to visualize working processes, but not for changing the hardware design of a working place. Questions about forces applied by humans can presently be answered only by the help of paper and pencil procedures. Even if such procedures exist in a software version, they remain appendages to the existing geometrical orientated modeling programs. Within the research project “RAMSIS-dynamic”, which was supported by BMW, new models have been developed for force, posture, and motion prediction based on experimental data. The procedure predicting the maximum forces uses calculated torque-ellipsoids. Dependencies of posture, gender and age are also considered in this model. For the posture prediction model the assumption is made that people try to minimize the ratio between necessary and maximum torque over all joints of their body. The resulting torque can be measured using a specially designed device. Additionally a model simulating target orientated motions of the limbs with low dynamic forces has been developed. This model considers some important factors like visual behavior, obstacle avoidance and different grasping modes. The three models were evaluated by comparison with real observed forces, postures and movements.

Ground Motion Prediction Model for the Peak Inelastic Displacement of Single-Degree-of-Freedom Bilinear Systems

2018 ◽  
Vol 34 (3) ◽  
pp. 1177-1199 ◽  
Author(s):  
Pablo Heresi ◽  
Héctor Dávalos ◽  
Eduardo Miranda
Keyword(s):  
Prediction Model ◽  
Ground Motion ◽  
Degree Of Freedom ◽  
Motion Prediction ◽  
Ground Motion Prediction ◽  
Vibration Period ◽  
Single Degree Of Freedom ◽  
Inelastic Displacement ◽  
Single Degree ◽  
Proposed Model

This paper presents a ground motion prediction model (GMPM) for estimating medians and standard deviations of the random horizontal component of the peak inelastic displacement of 5% damped single-degree-of-freedom (SDOF) systems, with bilinear hysteretic behavior and 3% postelastic stiffness ratio, directly as a function of the earthquake magnitude and the distance to the source. The equations were developed using a mixed effects model, with 1,662 recorded ground motions from 63 seismic events. In the proposed model, the median is computed as a function of the vibration period and the normalized strength of the system, as well as the event magnitude and the Joyner-Boore distance to the source. The standard deviation of the model is computed as a function of the vibration period and the normalized strength of the system. The proposed model has the advantage of not requiring an auxiliary elastic GMPM to predict the median and dispersion of peak inelastic displacement.

OC-0504: Comparing a clinical protocol and fast intra-fraction update of a new motion prediction model for tumor tracking

2014 ◽  
Vol 111 ◽  
pp. S198
Author(s):  
K. Poels ◽  
T. Depuydt ◽  
B. Engels ◽  
C. Collen ◽  
F. Steenbeke ◽  
...  
Keyword(s):  
Prediction Model ◽  
Motion Prediction ◽  
Clinical Protocol ◽  
Tumor Tracking

Dynamic Model of Dual Clutch Lever-Based Electromechanical Actuator

2011 ◽  
Author(s):  
Vladimir Ivanovic´ ◽  
Josˇko Deur ◽  
Milan Milutinovic´ ◽  
H. Eric Tseng
Keyword(s):  
Experimental Data ◽  
Dynamic Model ◽  
Model Validation ◽  
Bond Graph ◽  
Test Rig ◽  
Electromechanical Actuator ◽  
Actuator Dynamics ◽  
Operating Modes ◽  
Graph Modeling ◽  
Bond Graph Modeling

The paper presents a dynamic model of a dual clutch lever-based electromechanical actuator. Bond graph modeling technique is used to describe the clutch actuator dynamics. The model is parameterized and thoroughly validated based on the experimental data collected by using a test rig. The model validation results are used for the purpose of analysis of the actuator behavior under typical operating modes.

Research on Underwater Target Tracking Based on Contour Detection

2011 ◽  
Vol 317-319 ◽  
pp. 890-896
Author(s):  
Ming Jun Zhang ◽  
Yuan Yuan Wan ◽  
Zhen Zhong Chu
Keyword(s):  
Prediction Model ◽  
Target Tracking ◽  
Tracking System ◽  
Contour Detection ◽  
Motion Prediction ◽  
Moving Target ◽  
Contour Extraction ◽  
Tracking Accuracy ◽  
Tracking Method ◽  
Underwater Target

The traditional centroid tracking method over-relies on the accuracy of segment, which easily lead to loss of underwater moving target. This paper presents an object tracking method based on circular contour extraction, combining region feature and contour feature. Through the correction to circle features, the problem of multiple solutions causing by Hough transform circle detection is avoided. A new motion prediction model is constructed to make up the deficiency that three-order motion prediction model has disadvantage of high dimension and large calculation. The predicted position of object centroid is updated and corrected by circle contour, forming prediction-measurement-updating closed-loop target tracking system. To reduce system processing time, on the premise of the tracking accuracy, a dynamic detection method based on target state prediction model is proposed. The results of contour extraction and underwater moving target experiments demonstrate the effectiveness of the proposed method.

Simulation Investigations of Influence of Tooth Depth Coefficient on Dynamic Phenomena in Toothed Gear

2016 ◽  
Vol 817 ◽  
pp. 41-46
Author(s):  
Grzegorz Peruń
Keyword(s):  
Dynamic Model ◽  
Point Of View ◽  
General Level ◽  
Theoretical Point ◽  
Gear Pair ◽  
Contact Ratio ◽  
Dynamic Forces ◽  
Toothed Gears ◽  
Dynamic Phenomena

The increase of transverse contact ratio (εα) value usually allows reducing general level of gear vibroactivity. Article put to the test influence of coefficient εα value on dynamic forces in mesh zone with use of dynamic model of toothed gear. From theoretical point of view, the optimum value of transverse contact ratio is equal 2, what mean, that in mesh are always two pair of teeth. Obtainment such value of coefficient εα requires another construction of toothed wheels – wheels with HCR (High Contact Ratio) profile teeth. On result of occurrence of different deviations in toothed gears, as well as the dynamic phenomena, obtainment of continuous two-pair cooperation of gear pair is impossible and when this necessary is, solutions with near or exceed optimum value of coefficient are applied.

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