scholarly journals Mechanical systems of precise robots with vibrodrives, the vibrating mass of the exciting force of which performs impacts into deformable support and direction of the exciting force coincides with the line of relative motion of the system

Mechanika ◽  
2021 ◽  
Vol 27 (5) ◽  
pp. 408-414
Author(s):  
Kazimieras Ragulskis
Keyword(s):  
Numerical Method ◽  
High Precision ◽  
Relative Motion ◽  
Mechanical Systems ◽  
Exciting Force ◽  
Mechanical Vibrations ◽  
Nonlinear Parameters ◽  
Fast Development

Manipulator consisting from one sided self stopping mechanism and two masses which interact through an elastic – dissipative member is investigated. The drive of the manipulator is the generator of mechanical vibrations. With such elements the system is nonlinear. A separate case is investigated when static positions of equilibrium of both masses are located in one point. Because of this spectrums of eigenfrequencies are linear and infinite. All those facts mean that the operation of the manipulator is optimal. Fast development of robots gives rise to the investigations of increasing intensity creating various types of robots especially in the area of high precision. Mechanical systems of robot must perform laws and trajectories of motion, positioning in space with highest possible precision as well as ensure dynamicity of highest possible stability. Those aims are achieved in the presented paper by creating a structure of the best design, based on vibroimpacts as well as by choosing corresponding nonlinear parameters of the system. The investigation is performed by analytical – numerical method. The obtained results enable to create mechanical systems for precise robots.

Investigation of relative motion in the triple system ADS 48 on the basis of Gaia DR2 and Pulkovo 26-inch refractor observations

2021 ◽  
pp. 89-98
Author(s):  
O. V. KIYAEVA ◽  
R. YA. ZHUCHKOV ◽  
I.S. IZMAILOV
Keyword(s):  
High Precision ◽  
Relative Motion ◽  
Apparent Motion ◽  
Triple System ◽  
Radial Velocities ◽  
Proper Motions ◽  
The Family ◽  
Outer Pair ◽  
Motion Parameters ◽  
Gaia Dr2

There are high-precision positions, proper motions, parallaxes and radial velocities at the instant 2015.5 for all three components of the star ADS 48 ABF in the catalogue Gaia DR2 (2018). According to these data relative motions and the family of orbits were calculated by the Apparent Motion Parameters (AMP) method (Kiselev and Kiyaeva, 1980), and the best orbit was chosen for the inner pair AB. A perturbation with the period of 11 years was discovered according to Pulkovo observations of the outer pair. The reasons for the perturbation are discussed.

Electrical Elements in Reduction of Mechanical Vibrations

2013 ◽  
Vol 371 ◽  
pp. 657-661 ◽  
Author(s):  
Katarzyna Białas
Keyword(s):  
Mechanical System ◽  
Vibration Reduction ◽  
Mechanical Systems ◽  
Synthetic Method ◽  
Basic System ◽  
Mechanical Vibrations ◽  
Parametric Synthesis ◽  
System Designer ◽  
Active Elements ◽  
Reduction Methods

This work presents methods of reduction of the vibration of mechanical systems by means of active elements as well as examples of implementation of active reduction of vibration by means of electrical elements [. This work also describes a structural and parametric synthesis, which can be defined as the design of systems meeting specific requirements. These requirements refer to the frequency values of the systems vibration. The presented approach i.e. a non-classical synthetic method applied in designing mechanical systems, one (as early as at the design and construction stage) may verify future systems [1-. This work presents the description of vibration reduction methods. The most popular methods are passive, active and semi-active. An important aspect of this work is the presentation of several possibilities of the physical implementation of active subsystems. In examples active subsystems consisted of the following electric elements is coil with a movable core. In this work is presents influence of electrical subsystem to basic mechanical system. Designer should analyse the resultant systems and investigate the interaction between the subsystems and the basic system [4-.

Calculation for Equivalent Nodal Force of Prestress in 20 Nodes Isoparametric Element

2011 ◽  
Vol 142 ◽  
pp. 129-133
Author(s):  
Hao Yang ◽  
Na Li ◽  
Bing Shuang Xu
Keyword(s):  
Numerical Method ◽  
Iterative Algorithm ◽  
High Precision ◽  
Computer Programming ◽  
Isoparametric Element ◽  
Nodal Force ◽  
Bridge Model ◽  
Body Element ◽  
Very High

When establishing the prestressed bridge model with the entity unit, the simulation of prestress bar has very big limitation. The paper takes 20 nodes isoparametric element as an example and puts forward a kind of numerical method combined with the Newton iterative algorithm and Gauss integral algorithm to calculate equivalent loads of prestress in body element. This method can be used to calculate the equivalent loads of prestress in the various complex steel in bundle shapes and suits the computer programming. Through the final regular inspection, this method has been proved to have very high precision.

Development of High Precision Metal Micro-Electro-Mechanical-Systems Column for Portable Surface Acoustic Wave Gas Chromatograph

2012 ◽  
Vol 51 (7S) ◽  
pp. 07GC24 ◽  
Author(s):  
Takamitsu Iwaya ◽  
Shingo Akao ◽  
Toshihiro Sakamoto ◽  
Toshihiro Tsuji ◽  
Noritaka Nakaso ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
High Precision ◽  
Mechanical Systems ◽  
Gas Chromatograph ◽  
Micro Electro Mechanical Systems

Vibration Analysis of Mechanical Systems with the Discrete-Continuous Distribution of Parameters

2013 ◽  
Vol 198 ◽  
pp. 698-703 ◽  
Author(s):  
Katarzyna Białas ◽  
Agnieszka Sękala
Keyword(s):  
Vibration Analysis ◽  
Classical Method ◽  
Mechanical Systems ◽  
Continuous Distribution ◽  
Mechanical Vibrations

This paper presents an analysis of mechanical systems with the discrete-continuous distribution of parameters performing small vibrations around the adopted state of equilibrium. The modelling and analysis of discretecontinuous vibration systems with conjugations using the non-classical method is a more general approach as compared to modelling and analysis in classical terms. The method presented in this article permits a simplification and facilitates the understanding of mechanical vibrations in such class of systems.

Transient Analysis of Forced Vibrations of Complex Structural-Mechanical Systems

1962 ◽  
Vol 66 (619) ◽  
pp. 457-460 ◽  
Author(s):  
S. P. Chan ◽  
H. L. Cox ◽  
W. A. Benfield
Keyword(s):  
Differential Equations ◽  
Numerical Method ◽  
Finite Differences ◽  
Transient Analysis ◽  
Equations Of Motion ◽  
Mechanical Systems ◽  
Forced Vibrations ◽  
Degree Of Freedom ◽  
Dynamic Forces ◽  
Complex Structural

This paper presents a numerical method, derived directly from the basic differential equations of motion and expressed in the form of recurrence-matrix of finite differences, that can be generally applied to all multi-degree-of-freedom structures subjected to dynamic forces or forced displacements on any masses at any instants of time. The movements of the system may be described by any form of generalised co-ordinates.

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