SU962755A1

SU962755A1 - Angular displacement string-type converter

Info

Publication number: SU962755A1
Application number: SU813264643A
Authority: SU
Inventors: Владимир Александрович Малецкий; Юрий Николаевич Турчанинов; Михаил Анатольевич Диченко; Мирон Иванович Малащук; Андрей Григорьевич Бестелесный; Владислав Владимирович Ироденко
Priority date: 1981-03-23
Filing date: 1981-03-23
Publication date: 1982-09-30

Description

() СТРУННЫЙ ПРЕОБРАЗОВАТЕЛЬ УГЛОВЫХ ПЕРЕМЕЩЕНИЙ() STRING CONVERTER OF ANGULAR DISPLACEMENTS

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Изобретение относитс к контроль но-измерительной технике и может быть использовано, в частности, дл измерени угловых перемещений.The invention relates to the control of measuring technique and can be used, in particular, to measure angular displacements.

Известен струнный преобразователь линейных перемещений, содержащий измерительный рычаг, нат нутую скрученную ленточную струну, магнит с охватывающими свободную часть струны полюсными наконечниками, автогенератор , измеритель частоты колебаний струны и отсчетный индекс, установленнный посредине струны tl ,The known linear displacement transducer contains a measuring lever, a tensioned stranded ribbon string, a magnet with pole tips covering the free part of the string, an autogenerator, a measuring instrument for the frequency of oscillations of the string and a reference index set in the middle of the string tl,

Однако известный преобразователь не может быть использован дл преобразовани угловых перемещений без использовани дополнительных средств преобразовани угловых перемещений в линейные перемещени .However, the known transducer cannot be used to convert angular displacements without the use of additional means of converting angular displacements into linear displacements.

Наиболее близким техническим решением к предлагаемому вл етс струнный преобразователь угловы.х пе ремещений, содержащий жестко закрепленную одним концом и нат нутую поThe closest technical solution to the proposed is a string transducer angular displacement, containing rigidly fixed at one end and tensioned across

продольной оси преобразовател ленточную струну и охватывающую ее магнитную систему с полюсными наконечниками . Ленточна струна предварительно скручена и при измерении угловых перемещений дополнительно закручиваетс или раскручиваетс вследствие чего измен етс ее попе , речна жесткость, а следовательно,the longitudinal axis of the transducer tape string and covering its magnetic system with pole pieces. The string string is pre-twisted and, when measuring angular displacements, it is additionally twisted or unwound, as a result of which its pope changes, the river rigidity and, consequently,

JO и частбта ее собственных колебаний, котора может быть измерена известными средства 2 .JO and part of its natural oscillations, which can be measured by known means 2.

Недостатки преобразовател - значительное измерительное , коts торое необходимо затратить на закручивание струны, а также наличие значительных интермодул ционных искажений выходного сигнала преобразовател , обусловленное тем, что скру20 ченна струна имеет на разных участках своей длины различную частоту собственных колебаний.The disadvantages of the transducer are considerable measuring ones, which must be expended on twisting the string, as well as the presence of significant intermodulation distortions in the output signal of the transducer, due to the fact that the twisted string has a different natural frequency of oscillations in different parts of its length.

Claims

The purpose of the invention is to reduce the measuring gain and increase the conversion resistance of the Dp to achieve the goal 8 string transducer of angular displacements containing rigidly attached with one end and tensioned along the longitudinal axis of the transducer tape string and surrounding the magnetic system with polar tips, with the end of the string rigidly attached to its cross section is non-circular and limited along the contour of a monotonic curve, and the magnetic system is connected during the measurement liruemymobektom is rotatable about the longitudinal axis of the transducer. FIG. 1 schematically represents the structure of a string transformed body; in fig. 2 is a section A-A in FIG. 1. A string converter of angular displacements contains a string string 1 stretched along its longitudinal axis and a magnetic system 2 with pole pieces encompassing it, made, for example, in the form of an electromagnet, the excitation winding 3 of which is connected to an auto-oscillator and a frequency meter (not shown). The ends of the ribbon string 1 are rigidly and motionlessly fixed, and the magnetic system 2 is made movable with the possibility of angular rotation (rotation) around the longitudinal axis of the converter. For this, it can be connected, for example, by means of a lever with a twisted tubular spring 5, which is under pressure P, i.e. The transducer can be used in depth gauges in which angular displacement is created by an elastic sensing element, i.e. angular drive may be low power. String transducer of angular displacements works as follows. An auto-oscillator (not shown) for supplying high-frequency voltage to the winding 3 of the electromagnet or directly to string 1 (in the case of using a magnetic system 2 with standing magnets) supports the oscillations of the string close to the frequency of its natural oscillations. The frequency of the excitation voltage is monitored with a frequency meter. By making a contour of 9 pa of non-circular cross section of string 1, it has a different value of the moment of inertia in different directions along the plane of its cross section along A-A (Fig. 2), as a result of which the natural frequency of the string in these directions is also different. Therefore, with a smooth change in the angular position of the magnetic system 2 relative to the ribbon string 1 with a non-circular cross section bounded by the monotone curve, the plane of vibration of the string and, consequently, the frequency of its oscillation without changing the tension of the string or its rigidity due to twisting changes. The selected string cross section contour determines the functional dependence of the frequency of the oscillator voltage depending on the magnitude of the angular displacement of the object being monitored. Due to the fact that the string is not twisted during operation and the angular drive from the object to the transducer is loaded not on it, but on the magnetic system, the loading force on the drive (measuring force) turns out to be insignificant. In addition, since the string has a uniformly distributed stiffness along the length, when it oscillates at different frequencies, there is no additional frequency distortion of the output signal of the converter, i.e. its noise immunity increases. Claims of the Invention A stringed angular displacement transducer containing a tape string rigidly fixed at one end and stretched along the longitudinal axis of the transducer and a magnetic system with pole tips encompassing it, which means that the second end of the transducer is designed to reduce the measuring force and increase noise immunity. - it is rigidly fixed, its cross section is non-circular and limited along the contour by a monotonic curve, and the magnetic system connected in the process of measurements with a controlled volume This is designed to rotate around the longitudinal axis of the converter.