SU700786A2 - Simulator of input mechanical impedance of human arm - Google Patents

Description

The invention relates to devices that provide the ability to reproduce the dynamic characteristics of a person’s hand when testing a mechanized instrument, for example, pneumatic and electric hand-held machines of rotational and shock-rotating effects on vibration, and are intended to simulate the operator’s mechanical impedance for the case of simultaneously rotating and longitudinal tool oscillations in the simulation of dynamic operator-machine systems. Means are known that simulate the dynamic properties of the human hand for reproducing the input mechanical impedance. the hands of the operator, which are spring-damping devices consisting of a spring imitating the rigidity of the hand, and a throttle, whose hydraulic resistance reproduces the active resistance of the operator's hand. Simulators have a cylinder filled with a viscous fluid and a closed top and bottom cap having openings with glands through which a spring-loaded stem passes. The disadvantage of such means is that they can only move in one linear direction. By bus No. 380968 known simulator of the input mechanical impedance of the human hand, containing the simulation mass, the main adjustment spring, the electromagnetic damper and the cylinder placed in it a glass. In this simulator, dynamic characteristics can only be reproduced in the axial direction. Because of this, the simulator can only be used on those stands where hand-held machines are tested with axial vibration. The aim of the invention is to reproduce the impedance of the hand also with torsional vibrations of the power tool. For this, the proposed simulator is equipped with a second adjusting spring with opposite winding, —filled inside the first spring, both springs are rigidly fixed by means of adjusting rings with one end on the body of the electromagnetic damper, and the other on the washer

a cylinder installed with the possibility of simultaneously rotating and longitudinal oscillations with respect to the glass. In this case, the springs are made with parameters that will ensure that the Bahamas perceive the same axial deformation from one of the largest loading torque.

Not; the drawing shows the proposed to: mitator,

Oak contains an elastic element, made in the form of two adjustment springs 1 and 2 inserted one into another, the springs have opposite windings. The parameters of the springs (wire thickness, spring diameter, pitch) are chosen such that they have the same axial deformation from the same rotational relative to the axis of the moment. The design of the connection of these springs is weak. no deformation displacements along the axis when the torque is applied. This is achieved by the fact that on one side the ends of the springs are rigidly fixed with the help of the adjusting ring 3 on the core 4 of the electromagnetic damper, imitating much friction. Of the arms, and on the other hand with the help of the adjusting ring 5. Rigidly fastened to each other, the ends of the spring are fixed on the cylinder 6, which is a part of the imitation mass. The imitation mass also includes all elements rigidly mounted on the cylinder 6. These are the adjusting ring 5, the washer 7, on which the ring 5 is installed, the mounting ring 8 for fastening the tool, as well as the elastic element 9 and the closed ring 10 with corners with cutouts The magnetic conductor 11 of the electromagnetic damper with the coil 12 enters the gap. The magnetic conductor 11 has radial cuts, which ensures the intersection of the magnetic lines by the ring 10 both in the direction along the axis and when rotating about the axis. schats both along and relative cup 13, fixed to core 4 with lomoschyu balls 14 arranged in the outer surface of cup 13 nests,

The operation of the device is as follows.

During the vibration test, the simulator together with the hand tool, such as a wrench, is pressed against the receiver of the node reproducing the medium being processed (not shown in the drawing). Under the action of tension, the cylinder 6 moves on the balls 14, the springs 1 and 2 are compressed, the closed crown ring 10 enters the magnetic field

0 damper. When you turn on the manual

the tool in operation, the latter excites the longitudinal and torsional vibrations of parts 5,6.7,8.9.10 of the simulator, which leads to the occurrence.

5 certain frequency-dependent forces that prevent the movement of the body of the hand tool. The simulator provides the oscillatory mode of the instrument fixed in it

Q is the same as in the hands of the operator in a particular frequency range. The test can be repeated when turning on the rotation of the instrument in the opposite direction (for a reversing instrument).

The proposed simulator makes it possible to test for vibration a wide class of rotary-type and rotary-impact type hand tools, including reversing ones, for example, nuts,

0 screwdrivers, drilling machines, etc.

Claims (1)

Invention Formula 1, The simulator of the input mechanical impedance of a human hand on Aug. Ev, No. 380968, distinguished by the fact that, in order to reproduce the impedance of the arm, also with torsional oscillations of the mechanized instrument, it is equipped with a SECOND adjustment spring with opposite winding placed inside the first spring, both springs are rigidly fixed by means of adjusting rings with one ends on the body of the electromagnetic damper, and others on the washer of the cylinder, installed with the possibility of making relatively glass at the same time rotational and longitudinal vibrations. 2, the simulator POP. 1, characterized in that the springs are made with parameters that ensure the perception of the same axial deformation from one of the largest loading forces.