scholarly journals Investigation of Vehicle Seat with an Active Control System to Minimize Vertical Vibrations to the Head

2012 ◽  
Vol 78 (791) ◽  
pp. 2396-2404 ◽  
Author(s):  
Shinichiro OTA ◽  
Shuji NISHIYAMA
Keyword(s):  
Control System ◽  
Active Control ◽  
Active Control System ◽  
Vertical Vibrations ◽  
Vehicle Seat

Investigation of Vehicle Seat With Active Control System to Minimize Vertical Vibrations From Seat to Human Body

2011 ◽  
Author(s):  
S. Ota ◽  
S. Nishiyama
Keyword(s):  
Mechanical Properties ◽  
Control System ◽  
Active Control ◽  
Human Body ◽  
Optimization Algorithm ◽  
Standard Condition ◽  
Optimization Method ◽  
Active Control System ◽  
Vertical Vibrations ◽  
Vehicle Seat

This paper describes an active control system intended to minimize the vertical vibrations transferred from the seat to the human body in a vehicle. This system controls mechanical properties such as the spring constants and damping coefficients of each part of the vehicle seat by using an optimization algorithm that comprises vibration analysis and an optimization method. To examine the feasibility of the optimization algorithm, we designed a vibration model for the seat–occupant system and calculated the reduction in vibration due to the algorithm by numerical analysis. The mechanical properties of the back and front side of the seat were controlled with reference to the standard condition in the range of 1/1.5–1.5 times, 1/2–2 times, and 1/4–4 times. These results suggest that the percentage reduction in vibration for the head—a sensitive part of the human body—because of acceleration in the frequency range of 4–8 Hz was 36%–52%, 40%–63%, and 55%–76%, respectively. In summary, the proposed algorithm successfully reduced vibrations from the seat to the human body in a vehicle.

scholarly journals Passat: A Cubesat Student Design Project For Active Control System Development And Verification

2020 ◽  
Author(s):  
Daniel Rooney ◽  
Mathew Roseman ◽  
Charles Shotridge ◽  
Jeffrey Aschenbrenner ◽  
Sanjay Jayaram
Keyword(s):  
Control System ◽  
Active Control ◽  
System Development ◽  
Design Project ◽  
Active Control System

APPLICATION OF ELASTIC DEFORMATIONS TO PARABOLOIDAL SURFACE MAKING

2020 ◽  
Vol 3 ◽  
pp. 11-19
Author(s):  
A.V. NEMENKO ◽  
M.M. NIKITIN
Keyword(s):  
Control System ◽  
Active Control ◽  
Material Removal ◽  
Spherical Surface ◽  
Parabolic Mirror ◽  
Concave Mirror ◽  
Elastic Deformations ◽  
Elastic Bending ◽  
Active Control System ◽  
The Given

The transformation of a spherical concave mirror into a parabolic one with the help of elastic bending deformations is considered. The magnitude and direction of the load, which creates the necessary bend for transforming the mirror with the given parameters, are determined. Uneven material removal during machining is replaced by the bend of an optically accurate spherical surface already obtained. The application of the results to the creation of an active control system for the shaping of the surface of a paraboloid of rotation is considered. The proposed finishing technology is aimed at solving the problem of guaranteed obtaining optically accurate surface of a parabolic mirror.

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