SU982070A1 - Device for demonstrating oscillations - Google Patents

Description

541 DEVICE FOR DEMONSTRATION VIBRATIONS

The invention relates to educational devices and can be used in the educational process of higher and secondary specialized educational institutions in the study of the heaE of ionic vibrations of associated systems.

A known device for demonstrating oscillations of coupled systems, comprising two physical Mathniki, a means of interaction of masters, made in the form of springs, and a causative agent of oscillations, having an electric motor, a curved shaft and a bar, which sits on the axis of one of the masters 1-.

However, the known device, when visually recording the parameters of oscillations, does not allow reproducing oscillations with high accuracy. The design of the device does not have the means to quickly adjust the oscillation paragilletres.

The purpose of the invention is to improve the accuracy of recording vibration parameters when changing the interaction of pendulums.

This goal is achieved by the fact that the device for the demonstration of vibrations, containing two physical masters, a means of interaction of pendulums and a causative agent of vibrations.

equipped with a permanent magnet fixed to the free end of one of the waders, and the interaction of the friction nozzles interconnected between them, yc-f mounted on the axes of the wafers, while the oscillator is made in the form of a blocking generator inductively connected to a constant a magnet, and one of the attachments has

10 spring and adjusting nut.

Fig. 1 shows a constructive embodiment of the device in Fig. 2, an electrical circuit of a braked blocking generator.

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Claims (1)

The device is made in the form of a base 1, on which a rack 2 with a bracket 3 is mounted. On the bracket 3 there are bearing suspensions 4 and 5, rods 6 and 7 cans, carrying loads 8 and 9 on themselves. Loads 8 and 9 can move along the rods 6 and 7 and fasten them with locking screws 10 and 11. The swing axes of bobbins 12 and 13 are equipped with friction nozzles 14 and 15. The pressing force of the friction nozzles, dock 14 and 15 is adjusted by a spring 16 using a nut 17. At the bottom rod 6 fixed permanent magnet 18. On the base 1 is also the case of the application 19, inside which the braked g Locking generator 20 frequency of oscillations of the coil and removable GRU PS pendulum, the bodies of electric terminals for installation and podklyuchevin frequency counter (not shown). The blocking generator 20 includes a transformer 21, resistors 22 and 23, capacitors 24 and 25, a transistor 26, a diode 27, and a potential-free bus 28. The device works as follows. By turning, the nut 17 sets, with the necessary force, the compression of the friction nozzles 14 and 15. The loads 8 and the connecting arms are fixed in arbitrary positions on the connecting rods b and 7. The device is connected to the mains with a voltage of 220 V, 40 Hz. The bar 6 of the first mat deviates by an arbitrary angle from the equilibrium position and releases c. At the same time, it begins to oscillate with its own oscillation frequency f, and a part of its oscillation energy due to friction between the friction nozzles 14 and 15 is transmitted to the second master. In the process of oscillations of the first tandem magnet 18 at the time of its passage over a transformer with windings L, and C induces in L, the current opening transistor 26. The current of transistor 26, the passage through winding L / induces an emf in winding L, causing further opening of the transistor 26. Thus, an avalanche-like process takes place. The current L..J creates a magnetic field that pushes the permanent magnet 18 in a direction consistent with the direction of motion of the first man, i.e. replenishes the energy of the oscillating tiller, consumed to overcome the forces of friction. Therefore, the nudging pulses follow with a frequency of 2f, i.e. The first-tier lebani are harmonic. Moving the load 8 along the rod 6 in the course of the laboratory work and fixing it with a nut 10, the natural oscillations of the first and second pilot are matched. In this case, the second tandem consisting of the rod 7 and the load 9 begins to connect the resonant oscillations with a frequency of 2 f, i.e. with the frequency of impact on it, the friction force between the friction nozzles 14 and 15. Thus, the system of their two knights, which is an autonomous non-conservative system, makes periodic oscillations and, therefore, is self-oscillatory and its oscillations are self-oscillations. In this case, the amplitude and frequency of self-oscillations are determined only by the properties of the system itself, i.e. eigenfrequencies of oscillations of antennas and the magnitude of pushing impulses from the side of a transformer 21. The proposed device allows to significantly improve the accuracy of reproduction of oscillations of antennas. Compared with the prototype, the proposed device has a simpler design due to the absence of an electric drive with a crank and an excitation system formed by elastic elements (springs), and can be connected to commercially available oscillation frequency recorders. The invention The device for the demonstration of oscillations, containing two physical templars, a means of interaction of the technicians and a causative agent of oscillations, characterized in that, in order to increase the accuracy of recording the parameters of the oscillations when the interaction of the amplifiers changes, it is equipped with a permanent magnet fixed on the free end. one of the workers, and friction nozzles interacting with each other, mounted on the axes of the vehicles, while the exciter is made in the form of a blocking generator, inductively coupled to It has a permanent magnet, and one of the nozzles has a spring and an adjusting nut. Sources of information taken into account during the examination 1. USSR author's certificate No. 736160, cl. GI 09 B 23/08, 05/28.80. / J w 1 P. “2 5khod -yi 2206