CS229872B1 - Apparatus for determining the dynamic properties of terrain material at forced steady vibration - Google Patents
Apparatus for determining the dynamic properties of terrain material at forced steady vibration Download PDFInfo
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- CS229872B1 CS229872B1 CS546382A CS546382A CS229872B1 CS 229872 B1 CS229872 B1 CS 229872B1 CS 546382 A CS546382 A CS 546382A CS 546382 A CS546382 A CS 546382A CS 229872 B1 CS229872 B1 CS 229872B1
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- subsoil
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Abstract
Zariadenie je určené na zisťovanie dynamických vlastností materiálu terénneho podložia pri vinútenom ustálenom kmitaní. Podstata zariadenia spočívá v tom, že kontaktné podložka s podložím tvaru kruhovéj došky má v ťažisku umiestnený akcelerometer zvislého alebo otáčavého pohybu, nad ktorými je umiestnený vibrátor s premennou frekvenciou vertikálneho alebo krútiaceho kmitania cez snímač dynamickej sily alebo krútiaceho momentu. Zariadenie možno využit v stavebníctve, najma při určovaní dynamických vlastností podložia.The device is intended for determining the dynamic properties of the terrain subsoil material during coiled steady oscillation. The essence of the device is that the contact pad with the subsoil in the shape of a circular plate has an accelerometer of vertical or rotational movement located in the center of gravity, above which is placed a vibrator with a variable frequency of vertical or torsional oscillation via a dynamic force or torque sensor. The device can be used in construction, especially in determining the dynamic properties of the subsoil.
Description
Vynález podložia pri sa týká zariadenie na určovanie dynamických vlastností materiálu teránneho vynútenom ustálenom kmitaní.BACKGROUND OF THE INVENTION The present invention relates to an apparatus for determining the dynamic properties of a terrain-induced, forced vibration material.
Doteraz sa dynamické vlastnosti materiálu teránneho podložia zisťujú pomocou ťažkých mechanických vibrátorov s excentrickým zatažením alebo hydraulickými vibrátormi, ktorými sa vyvodzuje zvislá kmitanie podložia a merajú sa přitom parametre dynamických veličin.Up to now, the dynamic properties of the soil subsoil material have been determined by means of heavy mechanical vibrators with eccentric loading or hydraulic vibrators, which derive vertical oscillations of the subsoil and the parameters of dynamic quantities are measured.
V iných pripadoch sa zisťujú fázové rýchlosti. Sírenia vín napatia v prostředí podložia na principe merania dížky vlny.In other cases, phase speeds are detected. The propagation of the tensile wines in the subsoil environment is based on the measurement of the wavelength.
Například diagnostický vibrátor podTa čs. AO čís. 164 064, určený na nerezonančné meranie defektov materiálu je založený na principe merania změny zéťaže vibrátore indikováním zmien napatia jediného snímača. Přitom sa vnáSajú pozdížne vlny do sktímanáho prostredia a defektné miesta sa zisťujú podTa změny akustiekej impedaneie. Nevýhodou tohto zariadenia je, že pomocou jeho údajov nemožno určovat dynamické moduly pružnosti, rýchlosť Sírenia vín napatia, Poissonov koeficient a parameter tlmenia.For example, a diagnostic vibrator under TSA MS. AO no. 164 064, designed for non-resonance measurement of material defects, is based on the principle of measuring the variation of the vibrator load by indicating voltage variations of a single sensor. At the same time, longitudinal waves are introduced into the scanned environment and defective points are detected by changes in acoustic impedance. The disadvantage of this device is that its data make it impossible to determine the dynamic modulus of elasticity, the speed of the propagation of the tension wines, the Poisson coefficient and the damping parameter.
Okrem toho nevýhodou je aj to, že sa pri meraní vyžaduje vačší povrch podložia.A further disadvantage is that a larger subsoil surface is required for measurement.
Přitom sú používané vibrátory veTmi ťažké a manipulácia s nimi je obtiažna, majú poměrně úzký frekvenčný rozsah, pracujú len v oblasti nízkých frekvencií a možno ich používat lan v Specializovaných laboratóriach.The vibrators used are very difficult and difficult to handle, have a relatively narrow frequency range, operate only in the low frequency range and can be used in ropes in specialized laboratories.
Uvedené nedostatky odstraňuje zariadenie na určovanie dynamických vlastnostni materiálu teránneho podložia při vynútenom ustálenom kmitaní, pozostávajúoe z vibrátore, snímača a podložky, podTa vynálezu, ktorého podstata spočívá v tom, že kontaktná podložka s podložím tvaru kruhovej došky má v ťažisku umiestnený akcelerometer zvislého alebo otóčavého pohybu, nad ktorými je umiestnený vibrátor s proměnnou frekvenciou vertlkálneho alebo krútiaceho kmitania cez snímač dynamickej šity alebo krútiaceho momentu.[0003] The above-mentioned drawbacks are eliminated by a device for determining the dynamic properties of terrain bed material under forced steady-state oscillation consisting of a vibrator, a sensor and a pad according to the invention. above which a vibrator with a variable frequency of vertical or torque is placed via a dynamic seam or torque sensor.
Vynález zariadenia na určovanie dynamických vlastností materiálu teránneho podložia umožňuje pri vynútenom ustálenom kmitaní zisťovať hodnoty dynamických vlastností teránneho podložia, potřebné pre projekciu stavieb a konstrukci! namáhaných dynamickými účinkami (napr. základoch pod stroje, pri posudzovaní seizmicity zemných hrádzi, priehrad a pod.), ďalej pri dynamickej diagnostike a kontrole kvality podsypných a podložných vrstiev konStrukcií vozoviek v cestnom a letiítnom staviteTstve, při kontrole kvality zhutnenia sypáním a určovaní vlastností materiálov násypových telies při stavbě hrádzi a pod. Zariadenie je 1’ahko přenosné, kompaktně, skúSky s ním sú nedeštruktívne, nevyžadujú nijakú úpravu miesta merania a možno ho použit tak na pláni ako aj v sondách.The invention of a device for determining the dynamic properties of a subsoil material allows, under forced steady-state oscillation, to determine the values of the dynamic properties of the subsoil required for the design of buildings and structures! stressed by dynamic effects (eg under foundations under the machine, in assessing the seismicity of earth dams, dams, etc.), in the dynamic diagnostics and quality control of subfloor and backing layers of road construction in road and aerospace construction; embankments during the construction of dikes and the like. The device is portable, compact, non-destructive, non-destructive, and can be used both on-board and in probes.
Zariadenie na určovanie dynamických vlastností materiálu teránneho podložia pri vynú-r tenom ustálenom kmitaní je schematicky znázorněné na pripojenom obrázku.An apparatus for determining the dynamic properties of a subsoil material at a forced steady state vibration is shown schematically in the attached figure.
Zariadenie pozostáva z hruběj oceTovej kruhovej došky i, hmotnosti 40 kg s kontaktnou oThe device consists of a thicker steel thatched ring i, weighing 40 kg with a contact o
kruhovou plochou 500 cm , v ktorej ťažisku je umiestnený akcelerometer 2 pre zvislé, resp. krútive kmitanie. Vibrátor 2, ako budič zvislého, resp. krútivého kmitania kruhovej došky 1 písobí prostredníctvom snímača £ na meranie aplitúdy sily, resp. krútiaceho momentu na kruhovú došku i·a circular surface of 500 cm, in which the center of gravity is located the accelerometer 2 for the vertical respectively. torsional vibration. Vibrator 2, as an exciter for the vertical respectively the torsional oscillation of the circular thatch 1 by means of a sensor 5 for measuring the force of the force or the force of the force. torque per circular thatch i ·
Přitom sa pri stálej amplitudě zrýohlenia kmitavého pohybu kruhovej došky i pri řízných frekvenciatíh meria amplituda sily alebo torzného momentu. Poměr sily k súčinu hmoty a zrýohlenia vertlkálneho pohybu hmoty na podloží, resp. poměr torzného momentu k súčinu zrýchlenia uhla pootáčania hmoty a jej hmotného mementu zotrvačnosti v závislosti' na frekvencli kmitania určuje funkciu normovanej meohanickej impedaneie. Extrémně súradnice funkcie mechaniekej impendancie v rezonancii a priebeh v podrezonančnej oblasti umožňujú vyhodnotit dynamické vazkopružné charakteristiky materiálu podložia (parametre tlmenia, rýchlosť Sírenia priečnych vín,napatia, moduly pružnosti atá.). Funkcia normovanej mechaniekej impedaneie pre kmitajúcu hmotu na podloží je veTmi výhodnou meranou veličinou, ktorá najlepšie vyhovuje súčasnej mera3 cej technike, dá se zisťovať v Sirokom frekvenčnom rozsahu a jej priebeh poskytuje možnost kompletně určovat dynamické vazkopružné parametre materiálu terénneho podložia.In this case, the amplitude of the force or the torsional moment is measured at a constant amplitude of the oscillating movement of the circular thatch even at control frequencies. The ratio of the force to the product of the mass and the enhancement of the vertical movement of the mass on the ground, respectively. the ratio of the torsional moment to the product of the acceleration of the rotation angle of the mass and its mass moment of inertia as a function of the vibration frequency determines the function of the standardized meohanic impedance. The extremely coordinate of the mechanical impedance function in the resonance and the course in the sub-resonance region allow to evaluate the dynamic viscous characteristics of the subsoil material (damping parameters, speed of crosswind propagation, stresses, elastic moduli, etc.). The function of the standard mechanical impedance for oscillating matter on the subsoil is a very advantageous measured quantity that best suits the current measuring technique, can be detected in the wide frequency range and its course provides the possibility to completely determine the dynamic viscoelastic parameters of the subsoil material.
Zariadenie možno využít v stavebníctve, při určovaní dynamických vlastností podložia.The device can be used in construction, in determining the dynamic properties of the subsoil.
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Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS546382A CS229872B1 (en) | 1982-07-16 | 1982-07-16 | Apparatus for determining the dynamic properties of terrain material at forced steady vibration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS546382A CS229872B1 (en) | 1982-07-16 | 1982-07-16 | Apparatus for determining the dynamic properties of terrain material at forced steady vibration |
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| Publication Number | Publication Date |
|---|---|
| CS229872B1 true CS229872B1 (en) | 1984-07-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CS546382A CS229872B1 (en) | 1982-07-16 | 1982-07-16 | Apparatus for determining the dynamic properties of terrain material at forced steady vibration |
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| CS (1) | CS229872B1 (en) |
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1982
- 1982-07-16 CS CS546382A patent/CS229872B1/en unknown
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