DE566209C - Device for measuring the exciting force (damping work) in vibration machines u. like - Google Patents
Device for measuring the exciting force (damping work) in vibration machines u. likeInfo
- Publication number
- DE566209C DE566209C DEM101597D DEM0101597D DE566209C DE 566209 C DE566209 C DE 566209C DE M101597 D DEM101597 D DE M101597D DE M0101597 D DEM0101597 D DE M0101597D DE 566209 C DE566209 C DE 566209C
- Authority
- DE
- Germany
- Prior art keywords
- exciting force
- damping work
- measuring
- vibrations
- vibration machines
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Description
Vorrichtung zur Messung der erregenden Kraft (Dämpfungsarbeit) bei Schwingungsmaschinen u. dgl. Bei Schwingungsmaschinen, z. B. bei elektrisch betriebenen Drehschwingungsmaschinen zur Dauerprüfung von Stäben auf Drehungsfestigkeit, ist es erwünscht, die Stärke der die Schwingungen erregenden Kraft bzw. der Dämpfungsarbeit zu messen. Eine Vorrichtung hierzu ist Gegenstand der Erfindung. Diese -besteht darin, daß_das den Probestab zu Drehschwingungen erregende System, also z. B. die Elektromagnete mit dem sie tragenden Gehäuse, gegenüber seiner Lagerung als schwingendes Gebilde ausgeführt ist, das durch die der erregenden Kraft gleiche, aber entgegengesetzte Reaktion in erzwungene Schwingungen versetzt wird, deren Ausschlag unter Berücksichtigung des Phasenunterschiedes beider Schwingungen, des Trägheitsmoments des Gehäuses usw. das Maß der erregenden Kraft (Dämpfungsarbeit) liefert.Device for measuring the exciting force (damping work) Vibration machines and the like. B. with electrically operated Torsional vibration machines for fatigue testing of bars for torsional strength it is desirable to determine the strength of the force that excites the vibrations or the damping work to eat. A device for this purpose is the subject of the invention. This exists in that the system exciting the test rod to torsional vibrations, e.g. B. the Electromagnet with the housing supporting it, as a vibrating one compared to its storage Form is executed, the same by the exciting force, but opposite Reaction is put into forced oscillations, the deflection of which is taken into account the phase difference between the two vibrations, the moment of inertia of the housing, etc. provides the measure of the exciting force (damping work).
In der Zeichnung ist ein Ausführungsbeispiel einer elektrischen Drehschwingungsmaschine gemäß der Erfindung in den Grundzügen dargestellt.The drawing shows an embodiment of an electrical torsional vibration machine shown according to the invention in outline.
Es ist a ein Prüfstab, der bei b im Gestell der Maschine und bei c in einer Schwungscheibe eingespannt ist. Die letztere sitzt auf einer Welle e, die einen Anker d trägt, der seinerseits durch die Magnete f mittels Wechselstroms oder unterbrochenen Gleichstroms in Drehschwingungen versetzt wird.It is a is a test rod which is clamped at b in the frame of the machine and at c in a flywheel. The latter sits on a shaft e, which carries an armature d , which in turn is caused to vibrate by the magnets f by means of alternating current or interrupted direct current.
Am Magnetgehäuse g ist die Drehfeder h befestigt, deren anderes Ende am Lagerbock i angeschraubt ist. Die Masse des Magnetgehäuses nebst den Magneten und dem größten Teil der Feder wird durch die Reaktion in Schwingungen versetzt. Die Ausschläge können mit Hilfe einer Meßvorrichtung, die in der Zeichnung schematisch durch den Pfeil k angedeutet ist, ähnlich wie die Schwingungen des Prüfstabes d bzw. der Schwungscheibe c und der Welle beobachtet und gemessen werden: Die Größe der auf eine volle Schwingung des Prüfstabes geleisteten Dämpfungsarbeit A und damit die Größe der erregenden Kraft ist aus dem Ausschlag x des Magnetankers, aus dem Ausschlag y des Gehäuses, . dem Phasenunterschied z beider Schwingungen und aus dem Trägheitsinoment m des Gehäuses, der gemeinsamen Frequenz w beider Schwingungen und der Konstanten c der Gehäusefeder gegeben durch die Gleichung: A=n- (m w2 -c) -x-y-sin-z.The torsion spring h, the other end of which is screwed to the bearing block i, is fastened to the magnet housing g. The mass of the magnet housing together with the magnet and most of the spring is set in vibration by the reaction. The deflections can be observed and measured with the help of a measuring device, which is indicated schematically in the drawing by the arrow k, similar to the vibrations of the test rod d or the flywheel c and the shaft: The size of the performed on a full oscillation of the test rod Damping work A and thus the magnitude of the exciting force is derived from the deflection x of the armature, from the deflection y of the housing,. the phase difference z of the two vibrations and from the moment of inertia m of the housing, the common frequency w of both vibrations and the constant c of the housing spring given by the equation: A = n- (m w2 -c) -xy-sin-z.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEM101597D DE566209C (en) | Device for measuring the exciting force (damping work) in vibration machines u. like |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEM101597D DE566209C (en) | Device for measuring the exciting force (damping work) in vibration machines u. like |
Publications (1)
Publication Number | Publication Date |
---|---|
DE566209C true DE566209C (en) | 1932-12-12 |
Family
ID=7324626
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEM101597D Expired DE566209C (en) | Device for measuring the exciting force (damping work) in vibration machines u. like |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE566209C (en) |
-
0
- DE DEM101597D patent/DE566209C/en not_active Expired
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