Temat: machine vibration - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Machine vibrations with more degrees of freedom
Autorzy:: Vondřich, J.
Thöndel, E.
Powiązania:: https://bibliotekanauki.pl/articles/1429159.pdf
Data publikacji:: 2008
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: Matlab
Simulink
vibration
machine
Opis:: Rigid mounting of machines to a solid base is one of the requirements for high performance and quality of production. Machine vibrations occur as a result of unbalanced revolving masses, loading forces and moments, starting and coasting of driving motors and other effects. We try to eliminate these undesirable vibrations by suitable mounting of the machine and its parts as much as possible. Suitable mounting of the machine is possible using components such as torsion springs, pneumatic springs, rubber pads or other components. The article describes numerical calculation of optimal displacements the machine for the given his parameters.
Źródło:: Journal of Machine Engineering; 2008, 8, 4; 80-87
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Modelling Suppression of Non-Linear Machine Vibration
Autorzy:: Vondrich, J.
Thöndel, E.
Powiązania:: https://bibliotekanauki.pl/articles/971125.pdf
Data publikacji:: 2009
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: Matlab
non-linearity
vibration
machine
Opis:: In this paper, the coupled non-linear differential equations of the model of machine as non-linear dynamical two degree of freedom vibrating system including cubic non-linearity are solved. The system consists of the main system and the absorber. Consider the non-linearity dynamical vibrating system as a model machine, which is compiled of a driven motor, gearbox and mechanisms with elastic and damping parts and driven parts. The absorber is used to control the main system vibrations when subjected to external excitation force. This system represents many applications in machine tools, ultrasonic cutting process, etc. Optimum working conditions for the absorber are by the same frequencies ω = ω2 [1] of the action force F =F0 sinω t and main mass m1. The effects of different parameters of the system are studied numerically with Matlab.
Źródło:: Journal of Machine Engineering; 2009, 9, 2; 45-50
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Modelling of vibration with absorber
Autorzy:: Vondřich, J.
Thöndel, E.
Jirku, S.
Powiązania:: https://bibliotekanauki.pl/articles/99605.pdf
Data publikacji:: 2010
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: numerical modelling
Simulink
vibration
machine
absorber
Opis:: Machine vibration occurs as a result of unbalanced revolving masses, loading forces and moments, starting and coasting of driving motors and other effects. We try to eliminate these undesirable vibrations by suitable mounting of the mechanical system. Another possibility of suppression of the vibration machine is to use an absorber. A model of a vibration mechanical system with a vibration absorber is presented in the paper. The model consists of a fixed-end vibrating beam with primary vibrating mass M and with stiffness K and damping B. The harmonic force F with frequency ? and amplitude A acts on the primary mass M as well as on the beam with stiffness k and damping b, where the secondary mass m of the absorber is mounted. The task of the absorber is to minimize the movement of the mass M. A model (Fig. 1) has two degrees of freedom X and x. Two equations describe the movement of the primary mass M and the secondary mass m of the absorber. The model is solved first numerically by using Simulink. In numerical solution it is possible to set up parameters of the mechanical system with respect to the vibration reduction. According to the mechanical requirements for the mechanical system (output trajectory, velocity, forces and torques acting on the individual parts of the system), it is also possible to design input parameters (driving torques and other parameters of the mechanical system). A experimental model will be designed in order to verify results, where a voice-coil will be used as the actuator of the force F Numerical and experimental model allows changing parameters i.e. masses M and m, length L and l of the beams and frequency ? of the excitation force F. The results from the numerical solution are then possible to compare with the measured values of the experimental model. It is assumed that the experimental model will be equipped with accelerometers enabling the measuring of vibration, which will be placed on the masses M and m.
Źródło:: Journal of Machine Engineering; 2010, 10, 4; 100-105
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Multiple regenerative effect governing chatter behaviour after onset
Autorzy:: Sato, H.
Powiązania:: https://bibliotekanauki.pl/articles/99970.pdf
Data publikacji:: 2013
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: machine tools
chatter
vibration
regenerative effect
Opis:: Chatter is the self-excited vibration that occurs during cutting. The entire structure of a self-excited vibration comprises two core mechanisms, i.e., stability limit and sustained vibration with finite amplitude after onset. The latter mechanism remained unnoticed until the discovery of the multiple regenerative effect (MRE) in 1980. However, its effects have not yet been recognized correctly. This paper summarizes the problems that could be resolved by considering the MRE in the analysis from the theoretical and practical viewpoints. In conventional stability limit analyses,tool traces never intersect; however, after the onset of chatter in an actual system, traces immediately intersect. This resultsin tool-workpiece separation, chip thickness variation during the separation period, and chip breakage. A solution for equation of motion considering the MRE agrees well with chatter behaviour in actual applications. In addition, the solution yields the phase relationship between the displacement of work motion and the cutting force, although this relationship is not considered in the equation of motion. Further, the relationship between the penetrating cutting speed and the resistive force, confirmed experimentally, is introduced in equation of motion, which verifies the widening of the stability region at low cutting speeds.
Źródło:: Journal of Machine Engineering; 2013, 13, 3; 51-76
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: On counter measure of vibration for machine using alkaline water with polymer
Autorzy:: De Sousa Gama, V.
Tanabe, I.
Takahashi, S.
Powiązania:: https://bibliotekanauki.pl/articles/99397.pdf
Data publikacji:: 2014
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: vibration
machine tool
damper
polymer
alkaline water
Opis:: In the 21st century, as it is important to produce the products with high accuracy, high quality and eco-friendly, the most of manufacturers need several daring plans, unique ideas and new technologies. For example, in machine tool technology, restraint of vibration on the machine tool was required for high accuracy and quality, and several countermeasures using costly equipment and large quantity of electrical energy were used for the restraint, however those countermeasures are not enough. Therefore a countermeasure of vibration for machine tool using alkaline water with polymer was developed and evaluated. Polyethylene oxide was used for the polymer because of the low cost and the safety for health. Relationship between the mixed polymer in the alkaline water and the damping ratio were firstly investigated. And the optimum percentage of the polymer was decided for restraint of vibration on a machine tool. Then the damper structures using alkaline water with polymer were development, and the three dampers were set for restraint of vibration in the small machine tool; those are the support units, the vise and the head stock. Each damper was evaluated regarding noise and vibration on the machine tool and surface roughness on a work piece in the experiment. It is concluded from the results that; (1) the optimum percentage of the polymer for the damper was 6 wt%, (2) the damper structures using alkaline water with polymer were very effective for restraint of both noise and vibration on the machine tool and smoothly surface on the work piece.
Źródło:: Journal of Machine Engineering; 2014, 14, 3; 58-70
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: A mechatronic study on a model-based compensation of inertial vibration in a high-speed machine tool
Autorzy:: Parenti, P.
Bianchi, G.
Cau, N.
Albertelli, P.
Monno, M.
Powiązania:: https://bibliotekanauki.pl/articles/99723.pdf
Data publikacji:: 2011
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: machine tools
mechatronic simulation
vibration control
inertial deformation
Opis:: A significant limitation to machine tool productivity in high-speed operations is due to inertial vibrations. During strong accelerations, inertial forces generate oscillations that are translated into surface geometrical errors on the machined parts. Machine tools users minimize these problems by reducing machine axes quickness, thus affecting productivity. In this paper the effects of inertial deformations on machine tool accuracy have been studied to evaluate the possibility of adopting a software compensation strategy. The proposed model-based solution, based on a reduced model of the machine tool dynamics, has been tested in a mechatronic simulation environment. In order to meet industrial needs, the compensation scheme has been designed to allow its implementation on standard numerical controllers. A detailed feasibility analysis has been carried out studying all aspects that can potentially impede the application of such approach. Simulations and some preliminary experiment tests prove the effectiveness of the developed technique on a five-axis machining center.
Źródło:: Journal of Machine Engineering; 2011, 11, 4; 91-104
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Investigation of local and modal based active vibration control strategies on the example of an elastic system
Autorzy:: Peukert, Christoph
Pöhlmann, Patrick
Merx, Marcel
Müller, Jens
Ihlenfeldt, Steffen
Powiązania:: https://bibliotekanauki.pl/articles/99432.pdf
Data publikacji:: 2019
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: modal control
active vibration control
machine tool
inertial actuator
Opis:: Nowadays, feed axes are often equipped with multiple parallel-acting actuators in order to increase the dynamics of the machine tool. Also, additional actuators for active damping are widely used. Normally, the drives or actuators are controlled independently without consideration for the impact on each other. In contrast, by using the modal space control, the system can be decoupled and the modal control loops can be adjusted independently. This control approach is particularly suitable for motion systems, such as machine tools, which have more drives or actuators than degrees of freedom of movement. This paper deals with the pre-investigation of the modal-based vibration control for machine tools with additional actuators. The object of investigation is an elastic system with a movable saddle. The modal-based control is compared with a local control approach. The results obtained experimentally on the test rig are presented. The modal control is superior since, with the modal approach, each control loop corresponds to a specific vibration mode, and the control law for this loop is designed to provide the desired performance of the control system at the corresponding resonance frequency. The parameterisation of the control loops is simplified by modal control, since the modes can be controlled independently.
Źródło:: Journal of Machine Engineering; 2019, 19, 2; 32-45
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Experimental testing of active feed drive
Autorzy:: Sveda, J.
Valasek, M.
Sika, Z.
Powiązania:: https://bibliotekanauki.pl/articles/1429193.pdf
Data publikacji:: 2008
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: machine tool
testing bed
linear motor
vibration suppression
control loop
Opis:: The main disturbances of the machine tool frame are caused by operation of motion axes. Movement of high dynamic motion axes is connected with powerful force stroke that excite machine tool frame vibration and deteriorate machining surface quality and productivity. There are several possibilities how to suppress this vibration. This deals with the simulation and experimental testing of new advanced conception where the main motor is connected with the frame by an active element that is controlled by intelligent control technique.
Źródło:: Journal of Machine Engineering; 2008, 8, 4; 43-58
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Simulation Testing of the Machine Tool Equipped With the Active Feed Drive
Autorzy:: Sveda, J.
Valasek, M.
Sika, Z.
Powiązania:: https://bibliotekanauki.pl/articles/971162.pdf
Data publikacji:: 2009
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: machine tool
feed drive
control loop simulation
cutting force
vibration suppression
Opis:: The vibration of a machine tool is mainly caused by the dynamic acceleration of a motion axis and by the forces that act on it. All the disturbance forces are transmitted to the machine tool frame through the drive (motor) and its regulation loop and they excite its vibrations. Thus the achievable dynamics and machining quality is negatively influenced. There are several possibilities how to suppress the excited vibrations including the recently introduced "motor on motor" technique which is based on the serial connection of two linear motors. This paper presents new simulation results performed on the simulation model of a real machine tool. The maximal achievable tuning of the regulation loop parameters of the motion axis equipped with the "motor on motor" technique was confronted with the conventional feed drive setting. The "motor on motor" feed drive properties were also tested in the virtual machining operation mode where the real measured cutting force was used. The sensitivity analysis of the reaction force and the middle mass movement of the "motor on motor" feed drive solution to the predicted cutting force introduced to the feed drive control has been investigated. The middle mass is represented by the shared part of both linear motors which absorbs the high frequency part of the reaction force by its movement.
Źródło:: Journal of Machine Engineering; 2009, 9, 2; 81-92
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Development of immersed machine tool and machining in the strong alkaline water for reduction of CO2
Autorzy:: Da Cruz, J. R.
Tanabe, I.
Sakaguchi, N
Powiązania:: https://bibliotekanauki.pl/articles/99813.pdf
Data publikacji:: 2014
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: vibration
microbubble
strong alkaline water
immersed machine
thermal deformation
CO2 emission
Opis:: Nowadays, eco-friendly manufacture has become common request in the manufacturing and production. The excessive electric power associated with the usage of large amount of oil for cooling and lubrication during machining can increase the CO2 emission which is considered as large problem for environment. On the other hand, the presence of the unwanted vibration during machine can affect the quality of production. The influence of immersed machine tool in strong alkaline water has been investigated in previous work for normal machine operation when no vibration occurred. In present research, the influence of immersed condition to the vibration of the bench lathe machine was investigated. Thermal deformations of the spindle when operating bench lathe coincide with machine resonances were also measured for evaluation of accuracy. The calculation of CO2 emission using immersed bench lathe machine was done by comparing with the conventional machining. It is concluded from the results that; (1) Excellent cooling efficiency can be achieved by using strong alkaline water added with microbubble, (2) Vibration of machine tool was reduced during immersed condition, (3) Thermal deformation of the bench lathe was very small despite no-forced cooling was used, (4) The large number of CO2 that released annually can be reduced by immersed of machine tool.
Źródło:: Journal of Machine Engineering; 2014, 14, 3; 71-82
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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