Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 3

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: active headrest

Sortuj według:

Ogranicz wyniki do:

Ocena działania aktywnych zagłówków mechanicznych poprzez porównanie kinematyki ruchu zagłówków oraz manekina w próbie zderzeniowej

Jaśkiewicz M., Stańczyk T. L.

Zeszyty Naukowe Politechniki Świętokrzyskiej. Nauki Techniczne

2008

Z. 8

197-207

W artykule przedstawiono kinematykę ruchu głowy manekina Hybrid II, którą sporządzono na podstawie próby zderzeniowej wykonanej w PlMot. Na podstawie dostępnych materiałów przeprowadzono analizę kinematyki ruchu czterech typów mechanicznych zagłówków aktywnych. Dokonano oceny działania tych zagłówków.

This article presents movement kinematics of the head of the Hybrid II dummy. This kinematics was done on the basis of impact test made in PlMot. On the basis of available materials, analysis of movement kinematics of four type of the mechanical active headrest was done. The evaluation of headrest working was done.

A Double Input - Quadruple Output Adaptive Controller for the Active Headrest System

Pawełczyk M.

Mechanika / Akademia Górniczo-Hutnicza im. St. Staszica

2003

T. 22, z. 3

367-374

A system known as active headrest, generating the so-called zones of quiet at the ears of a person sitting in a chair is considered. It is shown that zones of highest noise reduction generated by a classical double input - double output control system do not reach the ears. To extend the zones four secondary sources, one located over another for each channel, are applied. The error microphones, one for each channel, are mounted between respective sources. Ali the components are arranged not to annoy the user, what impacts system performance. Internal model control with Filtered-x LMS algorithm is employed. Obtained results are presented graphically in the form of surfacial distribution of reduction areas. They confirm the expectations that the zones of high reduction significantly extend comparing to the double input - double output control system and really reach the ears, even in case of practical head movements.

Control Algorithms for Colating Zones of Quiet in the Active Headrest System

Pawelczyk M.

Molecular and Quantum Acoustics

2002

Vol. 23

339-350

A system known as the active headrest, generating the so-called zones of quiet at the ears of a person sitting in a chair is considered. Two adaptive control algorithms using the idea of virtual microphones are designed. One of them guaranteeing very high attenuation, is advised if the noise is stationary. Another control system proposed has much more general character and can be successfully applied for both stationary and non-stationary noises. It, in turn, assumes that the primary source is far from the headrest compared to the acoustic wavelenght. Obtained results are presented as distributtion of attenuation areas.