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1
Content available remote Mechanical properties modeling of neoprene in the contact zone of tool with the soil
Kabała A., Śledziński M., Meler F.
Vibrations in Physical Systems
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2012
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Vol. 25
205--210
EN
The investigations concern neoprene behaviour with contact of impact tools. Experimental method is used to solve nonlinear Young’s modulus of neoprene. The results of numerical simulation in FEM System ABAQUS/Explicit are compared with experimental results.
2
Content available remote 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.
3
Content available remote Thermodynamic Processes in the Modelling of Dynamic Characteristics of Impact Tools
Śledziński M.
Machine Dynamics Research
|
2011
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Vol. 35, No. 2
80-88
EN
The article describes thermodynamic processes occurring in the pneumatic actuator of the impact tool for soil compaction. The variability of kinematic and thermodynamic parameters was analysed for separate working cycle phases of the tool. The dynamics of changes in the quantities describing the tool's dynamic characteristics, i.e. Displacement and speed of the piston and air pressure in the actuator's working chambers were experimentally determined. A mathematical model describing dynamic characteristics of the impact tool, including the variability of thermodynamic processes occurring during the filling and emptying of the pneumatic actuator chambers was worked out. The result of consideration of the filling and emptying phases for the space above and below the piston as well as of the gas compression and decompression processes for the beater's working and return motions is a model description of thermodynamic processes. The results of the analyses are presented in charts describing the displacement of the beater and the tool's body during soil compacting. The paper also contains dynamics of pressure variability for the actuator chambers. The modelling of dynamic characteristics with thermodynamic processes taken into account is an effective tool for the designer of pneumatic impact tools.
4
Content available remote 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.
5
Content available remote Metodyka projektowania cech konstrukcyjnych narzędzi udarowych o niskim poziomie obciążeń biomechanicznych operatorów
Śledziński M.
Mechanik
|
2010
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R. 83, nr 1/S
247-254
PL
Przedstawiono metodykę projektowania układów wibroizolacji pneumatycznych narzędzi udarowych, uwzględniającą analizę stanu wibroaktywności narzędzia, przemiany termodynamiczne oraz identyfikację poziomu przyspieszeń uchwytu narzędzia. Opracowano model matematyczny cech dynamicznych zespołu narzędzie udarowe - wibroizolator. Zaprojektowano układ wibroizolacji skutecznie redukujący poziom transmisji drgań do organizmu operatora.
6
Content available remote 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.
7
Content available remote Modelling of Dynamic Properties in Vibration Isolation Design of Impact Pneumatic Tools
Śledziński M.
Machine Dynamics Problems
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2009
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Vol. 33, No. 3
112-119
EN
Modelling enables analysis of various design ideas in the early design stage, as well as makes it possible to study the influence of various construction parameters on the performance of the object designed. The mathematical model of dynamic properties of impact tools and vibration isolation systems can be used in the design process both in the concept design and construction properties development phase and during the optimizing and verification of the construction. The paper discusses the results of simulation analyses of the selection of specific parameters of vibration isolation systems for pneumatic tools. The mathematical models enable the design of vibration isolators of high dampening efficiency for the vibration transmitted into the human body, without loss of technological efficiency of the technological operation.
8
Content available Weryfikacja doświadczalna konstrukcji wibroizolatora narzędzia do zagęszczania gruntu
Śledziński M.
Acta Mechanica et Automatica
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2009
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Vol. 3, no. 1
104-106
PL
W pracy przedstawiono analizę stanu wibroaktywności narzędzia do zagęszczania gruntu. Wykonano pomiary przemieszczeń i przyspieszeń bijaka oraz uchwytu. Przekroczenie dopuszczalnego poziomu drgań spowodowało konieczność zastosowania wibroizolatora. Opracowano konstrukcję prototypu tłumika ograniczającego poziom drgań transmitowanych do układu dłoń – ramię operatora. Dwustopniowa redukcja drgań zastosowana w układzie wibroizolacji narzędzia spowodowała znaczne obniżenie poziomu drgań przenoszonych do organizmu operatora, co zostało potwierdzone w badaniach weryfikujących zaprojektowaną konstrukcję. Zastosowane rozwiązanie nie obniża efektywności procesu zagęszczania gruntu.
EN
The results of vibration activity study of the tool for soil compacting are presented. The displacement and acceleration of the ram and tool handle are investigated. The performed measurements showed that occurring vibration of the tool handle considerable exceed the admissible value, what caused the necessity of the use of vibration isolator. The construction of the damper’s prototype lowering vibration level transmitted to the hand-armoperator system was made. Introduction of two-stage vibration isolation system of the tool makes possible significant lowering of vibration transmission to the operator’s body without decreasing the effectiveness of the technological process. The projected vibration isolator became confirmed in the experimental verification.
9
Content available remote Single and Multi-Mass Mathematical Models in the Design of Vibration Isolation Systems for Pneumatic Tools
Śledziński M.
Machine Dynamics Problems
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2008
|
Vol. 32, No. 2
63-73
EN
The modelling enables analysis of various design solutions even in the design phase, and makes it possible to study the influence of specific design parameters on the performance of the machine designed. Mathematical models representing the dynamics of the hand-arm system, together with models of impact tools, enable simulation analyses and determination of the construction features of the tool. This paper discusses the harmful influence of vibration on human operators and the danger of the Vibration Syndrome. It also presents a description of a soil compacting tool constructed at the Chair of Machine Design Fundamentals at the Poznań University of Technology, as well as single and multi-mass mathematical models of dynamic properties of the vibration isolator, including models of the operator's hand and the soil compacted. Additionally, the paper discusses the results of simulation analyses of the selection of specific parameters of vibration isolation systems for pneumatic tools. The mathematical models enable the design of vibration isolators of high dampening efficiency for the vibration transmitted into the human body, without loss of technological efficiency of the actual technological operation.
10
Content available remote 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.
11
Content available remote Design Problems of Vibration Isolation Systems of Impact Tools
Śledziński M.
Machine Dynamics Problems
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2006
|
Vol. 30, No. 2
167-176
EN
This work presents a methodical approach to design problems in designing vibration isolation systems of impact tools. Experiments and analysis of impulses acting on the tool body enabled to develop a two-stage vibration isolation system effectively limiting the level of vibration transmitted to the operator's hand - arm system.
12
Dynamika wewnętrzna ubijaka pneumatycznego - weryfikacja doświadczalna opisu teoretycznego
Śledziński M.
Zeszyty Naukowe Politechniki Poznańskiej. Maszyny Robocze i Transport
|
2002
|
Nr 54
171-176
PL
W artykule przedstawiono weryfikację doświadczalną teoretycznych przebiegów ciśnień w komorach ubijaka pneumatycznego, uzyskanych w oparciu o model matematyczny [1, 2], Wskazano możliwe przyczyny rozbieżności oraz potrzebę nowego opisu dynamiki tego narzędzia.
EN
In the paper an experimental verification of theoretical pressure runs in chambers of a pneumatic rammer were presented, obtained on base of a mathematical model [1,2]. All the possible reasons of divergences were indicated as well as the need of new specification of dynamics of this tool.
13
Content available remote Historia rozwoju sprężyn
Branowski B., Śledziński M.
Kwartalnik Historii Nauki i Techniki
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1999
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R. 44, nr 2
107--122
EN
The history of spring construction is chronologically characterized. A description of various mechanisms with elastic elements is presented. Subsequent phases of development are illustrated by examples of inventions in the domain of military and transportation technology, significant to humankind.
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