CN100578178C - Testing device for dynamic performance of corrugated pipe and testing method therefor - Google Patents

Abstract

The disclosed dynamic performance testing device for bellows comprises: arranging an acceleration sensor (10) connected with a data collector on the flange disc (3) on lower end of the bellows piece work (11); linking two flanges by a bellows with two ends fixed on a upper/lower sealing boards (5, 13); connecting a pipe (9) to the joints (8, 14) of sealing boards. This invention can obtain true dynamic performance parameters.

Description

Corrugated tube dynamic performance test apparatus and test method thereof

Technical field:

The present invention relates to dynamic performance test apparatus and test method technical field under corrugated tube analog stream moving medium, the pressure load, a kind of corrugated tube dynamic performance test apparatus and test method thereof.

Background technology:

The test of corrugated tube dynamic property is in order to obtain the dynamic performance parameter of corrugated tube under certain working condition.At present, corrugated tube dynamic property test does not normally have in inside to carry out under flow media and the pressure load to single corrugated tube, and in the practical application, bellows interior is full of mobile and medium that pressure load is arranged.Existing test method can not be simulated the corrugated tube practical working situation truly, can not obtain the dynamic performance parameter of corrugated tube under actual working environment exactly.

Summary of the invention:

For in the corrugated tube dynamic performance experiment, simulating the working environment of corrugated tube truly, patent of the present invention provides a kind of corrugated tube dynamic performance test apparatus and test method thereof, can analog stream moving medium and pressure load, obtain real corrugated tube dynamic performance parameter.

The technical solution adopted in the present invention is: this corrugated tube dynamic performance test apparatus, link to each other with computing machine by data acquisition unit, described data acquisition unit is connected with acceleration transducer, and acceleration transducer is installed on the corrugated tube test specimen lower end ring flange of upper end; Two ends of two corrugated tube test specimens respectively are welded with ring flange, two corrugated tube test specimens link together with screw by ring flange, the corrugated tube test specimen upper flanges dish of upper end connects by the seal pad of screw and upper end, the corrugated tube test specimen lower end ring flange of lower end connects by the seal pad of screw and lower end, two seal pads respectively be welded with pipe adapter on the interstitial hole, each is connected the other end of pipe adapter with two ends of pipe; The seal pad of lower end with two support plates on its two end all by screw retention on support, the seal pad of upper end by screw retention on two support plates; The pole of crossbeam two ends is connected with the corrugated tube test specimen lower end ring flange of upper end; The forcing pump joint is installed on the gland bonnet of upper end, and the forcing pump joint links to each other with forcing pump.Be equipped with groove on described two seal pads, O-ring seal is housed in the groove.The middle part of described crossbeam is provided with boss.

Implement the test method of described corrugated tube dynamic performance test apparatus, its test method step is as follows:

1), two corrugated tube test specimens are combined, the test unit that assembles is placed on the support of level the common port freedom of two corrugated tube test specimens;

2), degree of will speed up sensor is connected with data acquisition unit;

3), the power hammer is connected with data acquisition unit;

4), data acquisition unit links to each other with computing machine;

5), by the forcing pump medium that input has certain pressure load to bellows interior;

6), adopt the hammer method that swashs to carry out vibration test, promptly firmly hammer the bossing in the middle of the vertical hammering crossbeam into shape, guarantee that excitation is applied to the mid point of crossbeam, excitation is passed to the corrugated tube test specimen lower end ring flange that is contained in the upper end by crossbeam, realizes free vibration.

7), the acceleration transducer that is contained on the corrugated tube test specimen lower end ring flange of upper end is passed to computing machine with the signal of the vibration signal that receives and power hammer through data acquisition unit, by data processing software signal record is got off, obtain the dynamic parameter of corrugated tube by processing vibration signal.

The invention has the beneficial effects as follows: by test unit of the present invention and test method thereof, can record the dynamic performance parameter of corrugated tube under flow media, pressure load exactly, these parameters in use avoid for corrugated tube because the destruction that resonance causes provides important basis.

Description of drawings:

Fig. 1 is a test unit synoptic diagram of the present invention;

Fig. 2 is a test unit mathematical model of the present invention;

Fig. 3 is a test unit Equivalent Mechanical schematic diagram of the present invention;

Fig. 4 is the oscillating curve figure of corrugated tube impact during the first time under the 0MPa pressure load;

Fig. 5 is the transport function figure of corrugated tube impact during the first time under the 0MPa pressure load;

Fig. 6 is the oscillating curve figure of the corrugated tube under the 0.2MPa pressure load when impacting the 5th time;

Fig. 7 is the transport function figure of the corrugated tube under the 0.2MPa pressure load when impacting the 5th time.

Embodiment:

The invention will be further described below in conjunction with accompanying drawing.

As shown in fig. 1, two ends of two same model corrugated tube test specimens 2 of the present invention and corrugated tube test specimen 11 respectively are welded with ring flange 3, be fixed with seal pad 13 in the upper end of support 1, two ends on the seal pad 13 respectively have support plate 4 and support plate 12 by screw retention, there is seal pad 5 upper end of support plate 4 and support plate 12 by screw retention, seal pad 13 is connected by the ring flange 3 of screw with corrugated tube test specimen 2 one ends, the ring flange 3 of corrugated tube test specimen 2 other ends is connected by the ring flange 3 of screw with corrugated tube test specimen 11 1 ends, the ring flange 3 of corrugated tube test specimen 11 other ends is connected with seal pad 5 by screw, seal pad 13 and seal pad 5 are provided with groove, and O-ring seal is housed in the groove; Respectively be welded with pipe adapter 8 and pipe adapter 14 on the interstitial hole of seal pad a pair of horses going side by side mouthful seal pad 13, each is connected the other end of pipe adapter 8 and pipe adapter 14 with two ends of pipe 9; The pole of crossbeam 7 one ends is connected with the ring flange 3 of corrugated tube test specimen 11 lower ends, and the middle part of crossbeam 7 is provided with boss; Acceleration transducer 10 is installed on the ring flange 3 of corrugated tube test specimen 11 lower ends, and acceleration transducer 10 is connected with data acquisition unit; Forcing pump joint 6 is installed on gland bonnet 5, and forcing pump joint 6 links to each other with forcing pump.

When being installed, test unit of the present invention to note: in the groove of seal pad 13 and seal pad 5, put into the O-ring seal that scribbles butter, and fastening by screw, guarantee between ring flange 3 and seal pad 13 and the seal pad 5 water-tight; The pole of crossbeam 7 two ends is connected with the ring flange 3 of corrugated tube test specimen 11 lower ends, guarantee that the excitation on the crossbeam 7 is passed on the middle ring flange of two corrugated tubes; Guarantee to be connected between corrugated tube assembly, pipe adapter 8, pipe adapter 14, the pipe 9, thereby make the medium of bellows interior can realize circulating; In order to prevent that test specimen from bearing prestress, should be suitable between the upper-lower seal plate with the fixing height of support.

Test method concrete steps of the present invention are as follows:

1, two same model corrugated tube test specimens 2 and corrugated tube test specimen 11 are combined, the test unit that assembles is placed on the support 1 of level the common port freedom of corrugated tube test specimen 2 and corrugated tube test specimen 11;

2, degree of will speed up sensor 10 is connected with data acquisition unit;

3, the power hammer is connected with data acquisition unit;

4, data acquisition unit links to each other with computing machine;

5, by the forcing pump medium that input has certain pressure load to bellows interior;

6, adopt the hammer method that swashs to carry out vibration test, promptly firmly hammer the bossing in the middle of the vertical hammering crossbeam 7 into shape, guarantee that excitation is applied to the mid point of crossbeam 7, excitation is passed to the ring flange 3 that is contained in corrugated tube test specimen 11 lower ends by crossbeam 7, realizes free vibration.

7, the acceleration transducer 10 that is contained on the corrugated tube test specimen 11 lower end ring flanges 3 is passed to computing machine with the signal of the vibration signal that receives and power hammer through data acquisition unit, by data processing software signal record is got off.Obtain the dynamic parameter (dynamic rate K, ratio of damping C and damping ratio ξ) of corrugated tube by processing to vibration signal.

The mathematical principle of this test method is as follows:

Its mathematical model of this test method as shown in Figure 2.C ₁With C ₂, K ₁With K ₂It is relation in parallel.So model shown in Figure 2 can further be reduced to mechanical model as shown in Figure 3 again.

K＝K ₁+K ₂(1)

C＝C ₁+C ₂(2)

Can directly record resonant frequency f by test _r, face peak value X mutually ₀And X ₁, according to the logarithmic decrement method, can resolve following parameter:

(1) dampingratio: by $\ln \left(\frac{X_0}{X_1}\right)=\frac{2\mathrm{\π\ξ}}{\sqrt{1-{\mathrm{\ξ}}^2}},$ Obtain: $\mathrm{\ξ}=\frac{\ln \left(\frac{X_0}{X_1}\right)}{\sqrt{4{\mathrm{\π}}^2+{\left(\ln \left(\frac{X_0}{X_1}\right)\right)}^2}}$

(2) natural frequency: ${\mathrm{<figure-callout\; id="0"\; label="f"\; filenames="C2006100175370013H1.png,C2006100175370014H1.png"\; state="\{\{state\}\}">f</figure-callout>}}_0=\frac{f_r}{\sqrt{1-2{\mathrm{\&zeta;}}^2}}$

(3) dynamic rate K=4 π ²Mf ₀ ²(M is the gross mass of two corrugated tubes, two ring flanges and crossbeam)

(4) ratio of damping $C=2\mathrm{\&zeta;}\sqrt{M{K}_{2n}}$

Can try to achieve K and C according to above formula.

Because corrugated tube 1, corrugated tube 2 patterns are identical, K ₁=K ₂, C ₁=C ₂, we can obtain by formula (1) and formula (2):

$K_1={\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="C2006100175370012H2.png"\; state="\{\{state\}\}">K</figure-callout>}}_2=\frac{\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="C2006100175370012H2.png"\; state="\{\{state\}\}">K</figure-callout>}}{2}$

$C_1={\mathrm{<figure-callout\; id="2"\; label="C"\; filenames="C2006100175370012H2.png"\; state="\{\{state\}\}">C</figure-callout>}}_2=\frac{\mathrm{<figure-callout\; id="2"\; label="C"\; filenames="C2006100175370012H2.png"\; state="\{\{state\}\}">C</figure-callout>}}{2}$

Again by K ₁And C ₁Calculate ζ and f ₀:

Dampingratio: $\mathrm{\&zeta;}=\frac{\mathrm{<figure-callout\; id="2"\; label="C"\; filenames="C2006100175370012H2.png"\; state="\{\{state\}\}">C</figure-callout>}}{2\sqrt{\mathrm{mK}}},$ Natural frequency f ₀: ${\mathrm{<figure-callout\; id="0"\; label="f"\; filenames="C2006100175370013H1.png,C2006100175370014H1.png"\; state="\{\{state\}\}">f</figure-callout>}}_0=\frac{1}{2\mathrm{\&pi;}}\sqrt{\frac{K}{m}}$ Wherein m is the quality of single ring flange.

This test can obtain the modal parameter of corrugated tube under different pressures load, obtains the situation of change of modal parameter under different pressures load of corrugated tube successively.Below illustrate:

Apply excited by impact to the crossbeam that links to each other with test specimen vertically by the power hammer, the free end of combination corrugated tube is passed in excitation by crossbeam, measure response data by acceleration transducer-charge amplifier-portable signal processing instrument, adopt the logarithmic decrement method to calculate the dynamic parameter of various corrugated tubes by response curve at last, obtain the free response signal of corrugated tube.Below be the experimental data of corrugated tube under water aqueous medium pressure.1#1# represents the combination of two 1# corrugated tubes.Firmly hammer hits five times the combination of the 1#1# under every kind of pressure load corrugated tube respectively, obtains oscillating curve figure, makes the transport function figure of oscillating curve.Table 1-table 2 is the original experimental data of 1#2# combination corrugated tube under the 0MPa-0.2MPa pressure load; Table 3 is the modal parameter under the 0MPa-0.2MPa pressure load of 1#1# combination corrugated tube; Table 4 is 1# corrugated tube modal parameter under the 0MPa-0.2MPa pressure load.Fig. 4 Fig. 5 is oscillating curve figure and the transport function figure when firmly hammer impacts for the first time to the combination of the 1#1# the 0MPa pressure load under corrugated tube, and numerical value 0.2209,0.1824,0.1717,0.1433,0.1175,0.1041 among Fig. 4 and the numerical value 18.0000 among Fig. 5 are exactly that impact in the table 1 is faced peak value X during the first time mutually ₀And X ₁And resonant frequency f _r, according to above-mentioned formula by X ₀And X ₁And f _rCan calculate dampingratio and natural frequency f ₀, also can try to achieve dynamic rate K and ratio of damping C.Fig. 6 Fig. 7 is oscillating curve figure and the transport function figure when firmly hammer impacts the 5th time to the combination of the 1#1# under 0.2MPa pressure load corrugated tube.Oscillating curve figure when all the other impact different number of times under the 0MPa-0.2MPa pressure load and transport function figure omit, because of its original experimental data has all reflected in table 1-table 2.

1#1# corrugated tube combined modality parameter under the table 10MPa pressure load

1#1# corrugated tube combined modality parameter under the table 20.2MPa pressure load

Table 31#1# corrugated tube modal parameter

Table 41# corrugated tube modal parameter statistics

Claims (4)

1, a kind of corrugated tube dynamic performance test apparatus, link to each other with computing machine by data acquisition unit, it is characterized in that: described data acquisition unit is connected with acceleration transducer (10), and acceleration transducer (10) is installed on second ring flange of second corrugated tube test specimen (11) lower end; The upper and lower side of the first corrugated tube test specimen (2) welds with the 4th ring flange and first ring flange respectively, the upper and lower side of the second corrugated tube test specimen (11) welds with the 3rd ring flange and second ring flange respectively, the first corrugated tube test specimen (2) and the second corrugated tube test specimen (11) link together by described the 4th ring flange and second ring flange, the 3rd ring flange of the second corrugated tube test specimen (11) upper end is connected with first seal pad (5) by screw, first ring flange of first corrugated tube test specimen (2) lower end is connected with second seal pad (13) by screw, respectively be welded with first pipe adapter (8) and second pipe adapter (14) on the interstitial hole of first seal pad (5) and second seal pad (13), the other end of first pipe adapter (8) is communicated with pipe one end, and the other end of second pipe adapter (14) is communicated with the pipe other end; First support plate (4) on second seal pad (13) and its two end and second support plate (12) all by screw retention on support (1), first seal pad (5) by screw retention on first support plate (4) and second support plate (12); The pole of crossbeam (7) two ends is connected with second ring flange of second corrugated tube test specimen (11) lower end; Forcing pump joint (6) is installed on first seal pad (5), and forcing pump joint (6) links to each other with forcing pump.

2, corrugated tube dynamic performance test apparatus according to claim 1 is characterized in that: described second seal pad (13) and first seal pad (5) are provided with groove, and O-ring seal is housed in the groove.

3, corrugated tube dynamic performance test apparatus according to claim 1 is characterized in that: the middle part of described crossbeam (7) is provided with boss.

4, a kind of test method of implementing the described corrugated tube dynamic performance test apparatus of claim 1 is characterized in that: described test method step is as follows:

1), the first corrugated tube test specimen (2) and the second corrugated tube test specimen (11) are combined, the test unit that assembles is placed on the support (1) of level the common port freedom of the first corrugated tube test specimen (2) and the second corrugated tube test specimen (11);

2), degree of will speed up sensor (10) is connected with data acquisition unit;

3), the power hammer is connected with data acquisition unit;

4), data acquisition unit links to each other with computing machine:

5), by the forcing pump medium that input has certain pressure load to bellows interior;

6), adopt the hammer method that swashs to carry out vibration test, promptly firmly hammer the middle bossing of vertical hammering crossbeam (7) into shape, guarantee that excitation is applied to the mid point of crossbeam (7), excitation is passed to second ring flange that is contained in second corrugated tube test specimen (11) lower end by crossbeam (7), realizes free vibration;

7), the acceleration transducer (10) that is contained on second ring flange of second corrugated tube test specimen (11) lower end is passed to computing machine with the signal of the vibration signal that receives and power hammer through data acquisition unit, by data processing software signal record is got off, obtain the dynamic parameter of corrugated tube by processing vibration signal.

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