Wyniki wyszukiwania - BazTech

1

Numerical Simulation on the Ram Cooperation with the Neoprene

Kabała A., Śledziński M., Meler F.

Machine Dynamics Research

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2012

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Vol. 36, No. 2

33-40

EN

The paper presents numerical modeling and simulation of impact tool with contact of substitute soil. Neoprene plate is used as the substitute soil. The results of numerical simulation are compared with experimental results. FEM System ABAQUS/Explicit is applied to solve the numerical problem.

2

Identification and Optimization of Design Properties of Dampers in Pneumatic Tools

Śledziński M.

Machine Dynamics Research

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2011

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Vol. 35, No. 4

111-117

EN

The study identifies the level of vibration activity in an impact tool for soil compaction. The subject of the study was a hand operated pneumatic tool, one that is currently manufactured and used in Poland. The displacements of the tool handle which characterize the level of vibration transmitted from the tool to the operator's hand-arm-system were measured. Experimental tests were carried out on the vibration isolation system with the aim to reduce the exposure of operators to vibration and their risk of vibration disease. The aim of the analysis was to optimize the design features of the damper for the choice of stiffness of the elastic system that minimizes the level of vibration transmitted from the tool to the operator. The vibration isolation system was tested at a measuring stand equipped with a hydraulic pulsator with a control system enabling simulation of a working cycle for the soil being compacted. It was possible to change the kinematic parameters of the working cycle within a wide range of amplitudes and frequencies, using a measuring set. Elastic systems for vibration isolators with different stiffness parameters were made and tested.

3

Analysis of Vibration Transmission in Vibration Isolation Systems of Impact Tools

Śledziński M.

Machine Dynamics Research

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2010

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Vol. 34, No. 1

110-117

EN

The paper presents an analysis of transmission of vibration from an impact tool to the operator. The multiplicity of excess of the vibration acceptable level on the handle was 7.78, and the maximum permissible working time did not exceed 3.7 min, which required the use of a vibration isolation system. A damper structure was worked out with the use of the mathematical model of the tool under analysis. Results of the measurement of vibration before and after the vibration isolation was presented as a spectral analysis. The experimental verification has shown substantial effectiveness of the proposed vibration isolator structure that reduced the multiplicity of excess of the vibration acceptable level to the value of 0.87, and an extension of the maximum permissible working time up to 627 min. The gain was a reduction in the transmission of vibration to the operator's hand-arm system without lowering of the effectivess of the soil compacting process.

4

Modelling of Dynamic Features of the Vibration Isolator - Impact Tool - Soil System

Śledziński M.

Machine Dynamics Problems

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2006

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Vol. 30, No. 4

152-159

EN

Vibration isolation is an effective method of reducing vibrations transmitted from the impact tool to the operator without loss effectiveness. The mathematical model describing the vibration isolator dynamic features enables to analyse the influence of individual design parameters on the tool handle vibration level. The paper gives the description of the mathematical model in which the analysis of dynamic properties and experimental tests of the tool are used. A multi-mass model taking into account biodynamic features of the system: hand - arm, dynamic features of the impact tool and designed vibration isolator was developed. An attempt to describe a model of rheological properties of compacted soil was undertaken.