Wyniki wyszukiwania - BazTech

1

Experimental investigations of human-operator as a pressure force regulator in man-hand tool system

Basista Z., Książek M., Tarnowski J.

Archives of Control Sciences

|

2009

|

Vol. 19, no. 1

81-92

EN

In the paper the results of experimental investigations of system operator-handle-base have been presented. The aim of investigations was to record dynamical reactions of human operator volunteers participating in the experiments to a visual, suddenly appearing step signal. The main task of each operator was to track the signal as precisely as possible with a push force exerted on the immobile handle. The measurements were done on an especially designed stand. Time histories of step reference and forces realized by the operator were statistically elaborated and graphically presented.

2

Ergonomic Hand Tool and Desk and Chair Development Process

Shin D., Kim J. Y., Hallbeck M. S., Haight J. M., Jung M. C.

International Journal of Occupational Safety and Ergonomics

|

2008

|

Vol. 14, No. 2

247--252

EN

This paper suggests a practical and simple process consisting of 8 stages: needs assessment, ergonomics guidelines, anthropometry, brainstorming and idea sketch, preliminary model, drafting and rendering, working prototype, and user trials. The feasibility of this process was verified with the development of a modified clamping hand tool and a new student desk and chair. The case studies showed how design difficulties were overcome by integrating ergonomics guidelines in the process.

3

Criteria of estimation of active vibration isolation system in hand-held percussive tools

Basista Z., Książek M. A.

Mechanics / AGH University of Science and Technology

|

2007

|

Vol. 26, no. 4

160-168

EN

The first step for the assessment and choice of comfort parameters of an active vibration isolation system of hand-held percussive power tools is the construction of appropriate dynamical model of the operator–tool–base system. The interaction between the hand and handle is composed of the passive, dynamical reaction of the hand caused by the vibration signal and a slowly varying feed force by which the operator controls the tool operation. In the paper a complex model of human-operator was proposed. Visual and tactile feedback signals coming to human nervous system were assumed as basic components of control of percussive tool by operator. It was shown that vibration comfort and work efficiency of the percussive tool are contradictory notions. Some feedback signals responsible for the control of the tool operation are attenuated by the vibration isolation system and finally when vibration comfort increases the control of the tool and the work efficiency decrease. In the paper a criterion of assessment of work comfort with percussive tool was assumed. Simulation of the proposed model of operator-tool-base system was done applying MATLAB/Simulink. The influence of parameter values of the proposed active vibration isolation system on the assumed comfort criterion was analyzed. The obtained results were graphically presented.

PL

Ocena i ustalenie warunków doboru właściwego układu wibroizolacji rękojeści w ręcznych narzędziach udarowych, wymaga zbudowania odpowiedniego modelu układu: „człowiek – narzędzie – podłoże”. Oddziaływanie człowieka-operatora na rękojeść narzędzia składa się z dynamicznej, biernej reakcji rąk, wywołanej sygnałem drganiowym, oraz wolnozmiennej siły nacisku, za pomocą której operator steruje pracą narzędzia. Zaproponowany w pracy model układu „człowiek – narzędzie – podłoże” jest złożonym układem, w którym występują wzrokowe i dotykowe sygnały zwrotne docierające do systemu nerwowego człowieka, na których podstawie realizuje on odpowiednie funkcje sterowania. Zastosowanie układu wibroizolacji rękojeści tworzy przeszkodę na drodze przepływu niektórych sygnałów zwrotnych. Podnosząc zatem komfort wibracyjny, możemy równocześnie obniżyć komfort ergonomiczny, polegający na łatwości sterowania pracą narzędzia. W związku z tym sformułowano odpowiednie kryteria oceny komfortu pracy. Za pomocą pakietu MATLAB/Simulink przeprowadzono symulację oraz przeanalizowano wpływ parametrów pewnego aktywnego układu wibroizolacji na wartości przyjętych wskaźników komfortu. Wyniki przedstawiono w postaci wykresów.

4

Symulacja eksperymentu dla zbadania wpływu układu wibroizolacji na jakość operowania ręcznym narzędziem udarowym

Basista Z.

Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika

|

2005

|

z. 65 [222]

11--18

EN

The paper discusses the results of the simulation of an experiment to the determine the model of human operator who controls the operation of a hand-held percussive tool. A model of the system has been developed. Using the data from the literature and based on it the analysis has been done of the influence of the parameters of a non-linear active vibration isolation system on the handling qualities and the vibration reduction level.

5

Integration of Ergonomics Into Hand Tool Design: Principle and Presentation of an Example

Aptel M., Claudon L., Marsot J.

International Journal of Occupational Safety and Ergonomics

|

2002

|

Vol. 8, No. 1

107--115

EN

The development of ergonomic tools responds to health protection needs on the part of workers, especially the work related musculoskeletal disorders of the upper limbs and to the development of ergonomic tools to take into account the needs of the factories. Only an ergonomic design process can enable tool manufacturers to meet these requirements. Three factors are involved: integration of ergonomics into the design process, definition of the different ergonomic stages involved, and finally knowledge of the different factors involved in hand tool design. This document examines these 3 elements in more detail and presents briefly a project of research whose main purpose is to integrate ergonomic criteria into a design process.