CN101196452A - Method for digital display rebound tester acquiring rebound value and digital test based on motion equation - Google Patents

Abstract

A DRO resiliometer (comprising a DRO sand pulp resiliometer, a DRO high strength resiliometer, etc) is provided, which is widely used in the intensity testing of concrete and other material. According to the movement formula of hitting sliding block when the resiliometer hitting, the invention gives the receiving rebounding value of the DRO resiliometer and provides the digital testing method of resiliometer. The main points of the technical scheme are that: firstly, when the resiliometer working, the time T of a hitting hammer driving a sensor (or other parts) to movies is collected, according to the following formula to obtain the rebouncing value X. For the various qualified resiliometers, Beta and Omega are fixed, on possible rebouncing angle, 1 is fixed; secondly, when the rebouncing value X counted according to 1 formula and that read by eyes are not same, which means that the Beta, Omega and 1 value of the resiliometer is different with the qualified resiliometer of the belonged kind, the resiliometer is unqualified. As for that, only need to compare if the rebouncing value X received automatically and the rebouncing value read by eyes are same, if the resiliometer is qualified can be tested. The invention is called as the digital testing method of resiliometer.

Description

The digital display reisilometer obtains rebound value and digital detection method based on the equation of motion

Technical field

The digital display reisilometer is gone up the rigging position sensor at common reisilometer (comprising the mortar reisilometer, high-strength reisilometer etc.) and is obtained rebound value.Digital display reisilometer and common reisilometer are widely used in the intensity detection of mixing earth and other structures, member and material.

Background technology

Some digital display reisilometer need be set up the corresponding relation (such as the correspondence table of sensed values and shift value or equation) between shift value and the sensor sensing value in advance.During reisilometer work, after the acquisition sensor sensing value, inquire about this corresponding relation and determine positional value, thereby determine rebound value.Along with the increase of sensor access times, the prolongation of time, this corresponding relation may change.

Reisilometer (comprising digital rebound tester and nonnumeric reisilometer) at regular intervals or work number of times, examine and determine on the reisilometer comparator of special use or on the special-purpose riveting stake.

Summary of the invention

The equation of motion that elastic hammer drove sensor (or its part) when the present invention worked according to reisilometer just can obtain rebound value, do not need to set up in advance and inquiring position value and sensor sensing value between corresponding relation.

And,, can derive reisilometer digital detection method according to the equation of motion of reisilometer elastic hammer.Reisilometer when work elastic hammer drives sensor (or its part) motion, and to the time interval of maximum displacement value (being the rebound value position), its equation of motion is in moment of sensor (or its part) setting in motion (be called among the present invention timing zero point):

y＝Ae ^-βtcos(ωt+)...............................(1)

Make y=x+l, x is the displacement after timing zero point.L is on certain operative orientation, and the elastic hammer equilibrium position is to the distance between the elastic hammer contact position.

The elastic hammer equilibrium position: the thrum hammer under the acting in conjunction of gravity own, spring tension or anchorage force, indicator slide block gravity, indicator slide block friction force, the residing position of elastic hammer.Because the restriction in reisilometer space, elastic hammer in fact not necessarily can be in this position.Indicator slide block gravity and indicator slide block friction force were not added on the elastic hammer before timing zero point, but the l value is subjected to their influence.

Elastic hammer contact position: in the thrum hammer springback process, touch the indicator slide block shell fragment, the initial time that the push pointer slide block moves together, the residing position of elastic hammer.

β and ω are the values that reisilometer is intrinsic, determine, l is determined jointly by attack direction and the feature of reisilometer own, if the attack direction determines that then l also is the value of determining.For reisilometer various types of, the compliant standard, β and ω are definite values, and on given attack direction, l also is a definite value.Equation (1) is transformed to:

x+l＝Ae ^-βtcos(ωt+)..........................(2)

T=T, x=X are arranged when arriving maximum position:

ωT+＝π......................................(3)

{。##.##1},

＝π-ωT......................................(4)

At timing zero point, t=0, x=0, following equation:

l＝Ae ^-β×0cos(ω×0+)＝Acos................(5)

Like this, arriving the maximum displacement position is the rebound value position, and following equation is arranged:

$X+l=\frac{l}{\cos (\mathrm{\π}-\mathrm{\ωT})}{e}^{-\mathrm{\βT}}\·\·\·\left(7\right)$

$X=\frac{l}{\cos (\mathrm{\π}-\mathrm{\ωT})}{e}^{-\mathrm{\βT}}-l\·\·\·\left(8\right)$

By attack, acquisition time T just can obtain rebound value X according to the equation of motion.

When on certain spring back angle, the rebound value X that calculates and actual read rebound value when inconsistent, illustrate that the reisilometer of β, the ω of this reisilometer and l and this kind class standard is inconsistent.Whether whether like this, adopt method of the present invention to obtain rebound value, only need the rebound value X that obtains more automatically simply consistent with the eye reading rebound value, it is qualified just can to examine and determine reisilometer.The present invention is called the digital detection method of reisilometer.

Embodiment

Reisilometer work, instrument obtains run duration T, according to equation (8), calculates rebound value X.

Relatively whether rebound value X equates with the eye reading rebound value whether examine and determine this reisilometer qualified.

Claims (1)

1. when reisilometer (comprising mortar reisilometer, high-strength reisilometer etc.) was worked, the equation of motion that elastic hammer drives indicator slide block was:

y＝Ae ^-βtcos(ωt+)........................(1)

Collect elastic hammer and drive the time T that sensor (or its part) moves, obtain rebound value X according to following equation:

$X=\frac{l}{\cos (\mathrm{\π}-\mathrm{\ωT})}{e}^{-\mathrm{\βT}}-l\·\·\·\left(2\right)$

For identical type, qualified reisilometer, β and ω value are definite values, and on certain spring back angle, l also is a definite value.β, ω and l can or calculate by test, generally are suitable for for congener, qualified reisilometer.

When the rebound value that obtains when the rebound value X that calculates according to (1) formula and eye reading is inconsistent, illustrate that β, the ω of this reisilometer and l value and qualified reisilometer are inconsistent, this reisilometer is underproof.Whether whether like this, only need the rebound value X that obtains more automatically simply consistent with the eye reading rebound value, it is qualified just can to examine and determine reisilometer.The present invention is called the digital detection method of reisilometer.