CN203732227U - Standard sample for vibration test capability verification - Google Patents

Abstract

The utility model provides a standard sample for vibration test capability verification. The sample is connected with a left support and a right support through a connecting cylinder. The right opening of the right support is sealed through a cover plate. The central portion of the connecting cylinder is provided with a resonant beam having a rectangular section. The left end of the resonant beam is connected with the left support. The long side of the rectangular section is vertical to the base plane of the support. The right end of the resonant beam is connected with a square mass block. The square mass block is extended out from the cover plate, the side surface of the square mass block is parallel to the side surface of the resonant beam, and the upper plane of the square mass block is parallel to the support bottom surface. The adopted fixation supports are provided with installation lugs, so in the test process, vibration characteristics of a vertical table and a horizontal slide table must be inspected separately, and compared with an existing standard sample, the standard sample of the utility model has advantages of small dynamic stress and good stability.

Description

A kind of vibration-testing proficiency testing standard sample

Technical field

The utility model relates to vibration test technology field, specifically a kind of vibration-testing proficiency testing standard sample.

Background technology

Can vibration-testing proficiency testing be equipment, the Personnel Skill Levels that the authorized by state council confirms vibration laboratory, guarantee the checking of science, reliability and the authenticity of testing result.This checking must provide a standard sample, to confirm by the accordance of the testing result of the unit of examination and authorized by state council testing result.

Existing standard sample directly uses harmonic oscillator, and the vibration characteristics of vertical stand and horizontal sliding table is difficult to be verified, and dynamic stress is large, poor stability.

Utility model content

The utility model, in order to solve the problem of prior art, provides a kind of vibration-testing proficiency testing standard sample that can simultaneously check vertical stand and horizontal sliding table vibration characteristics, and dynamic stress is little, and stability is high.

The utility model comprises the left support abutment and the right support abutment that connect by connecting cylinder, and two rest bases are provided with lug, and right support abutment right-end openings is passed through cover plate for sealing; There is a square-section resonance beam at connecting cylinder center, and resonance beam left end is connected with left support abutment, and the long limit of square-section is vertical with bearing baseplane; Resonance beam right-hand member is connected with square mass, and square mass stretches out cover plate, and its side parallels with resonance beam side, and upper plane is parallel with bottom surface of support saddle.Guarantee the vertical natural frequency f of test _nzthe vertical testing table of Shi Caiyong, and testing level natural frequency f _{nx (y)}time usage level slide unit, the vibration characteristics of vertical stand and horizontal sliding table must be verified respectively.

Further improve, described resonance beam is single rectangular beam, and its depth of section h is 2:1 with width B ratio, natural frequency f _ngood stability, meets f _nz=2f _{nx (y)}requirement.

Further improve, the part of described square mass in right support abutment has deep-slotted chip breaker, the in-built flexible spacing O type circle of deep-slotted chip breaker, after guaranteeing that it repeatedly vibrates, the fatigue stress of beam is less than its fatigue limit, to improve the stability of its frequency values, reduces dynamic stress.

Further improve, described square mass is provided with fine setting quality loop at right support abutment inner port position, can realize multiple sample natural frequency f _nnot identical requirement, and weight that can predictive sensor.

Further limit, described fine setting quality loop and square mass are threaded connection, and have regulated to fix with screw thread glue afterwards.

Further limit, described resonance beam, be threaded connection with bearing, and fix with screw thread glue.

Further limit, between resonance beam and left support abutment, fix by the first screw and nut, on the first screw, cover has fixed pin.

Further limit, right support abutment inside is that diameter is the cylinder of d, in order to limit the maximum displacement of O type circle, makes the dynamic stress of resonance beam be less than fatigue limit.

Brief description of the drawings

Fig. 1 is the utility model front view.

Fig. 2 is the utility model left view.

Fig. 3 is A-A place sectional view in Fig. 1.

Embodiment

Below in conjunction with accompanying drawing, the utility model is described in further detail.

The utility model as shown in Figure 1, wherein A-A place sectional view as shown in Figure 3, comprises that the left support abutment 1 and right support abutment 5, two rest bases that connect by connecting cylinder 2 are provided with lug, right support abutment 5 right-end openings seal by cover plate 7, and right support abutment 5 right-end openings are connected by the second screw B1 with cover plate 7.There is the resonance beam 3 of a square-section at connecting cylinder 2 centers, and resonance beam 3 is single rectangular beam, and its depth of section h can choose according to the actual requirements with width B ratio, are 2:1 such as selecting depth-width ratio.Resonance beam 3 left ends are connected with left support abutment, and the long limit of square-section is vertical with bearing baseplane; Resonance beam 3 right-hand members are connected with square mass 6, and square mass 6 stretches out cover plate 7, and its side parallels with resonance beam 3 sides, and upper plane is parallel with bottom surface of support saddle.Right support abutment inside is that diameter is the cylinder of d, in order to limit the maximum displacement of O type circle, makes the dynamic stress of resonance beam be less than fatigue limit.

The part of square mass 6 in right support abutment 5 has deep-slotted chip breaker, the in-built flexible spacing O type circle B2 of deep-slotted chip breaker, the port position of square mass 6 in right support abutment 5 is provided with fine setting quality loop 4, and fine setting quality loop 4 is threaded connection with square mass 6, regulated to fix with screw thread glue afterwards.

Fixing by the first screw B4 and nut 8 between resonance beam 3 and left support abutment, as shown in Figure 2, the upper cover of the first screw B4 has fixed pin B3.

The utility model technical requirement is as follows:

1) vertical direction of sample and the natural frequency of horizontal direction are than being f _nz: f _{nx (y)}=2:1;

2) the natural frequency f of 100 samples _ninot identical;

3) each axial natural frequency f _niafter test of many times, should keep stable, its rate of change R≤0.001;

4) f _niwhen test, should change the correlation parameter of inspection vibration simultaneously.

Theoretical foundation of the present utility model is as follows:

1) by cantilever deflection formula:

In formula:

E-----Young modulus

The length of l------beam

The rigidity of beam

2) by the distributed mass m of cantilever _iequivalence lumped mass m _eqcorrelation formula be:

In formula: the bulk density of q-------------beam

The length of l--------------beam

G--------------acceleration of gravity

3) natural frequency f _n

Lumped mass M ₀by equivalent mass m _eqwith additional mass M composition, M comprises weight mass m ₁, fine setting quality m ₂and sensor mass m ₃;

Be M0=me _q+ M=me _q+ m1+m2+m3

By $f_n=\frac{1}{2\mathrm{\π}}\sqrt{\frac{\mathrm{Kg}}{W_0}}$ Have

After arrangement, have:

After arrangement, in the time that depth of section h is h/B=2 with the ratio of width B, meet f _nz=2f _{nx (y)}requirement.

The concrete application approach of the utility model is a lot; the above is only preferred implementation of the present utility model; should be understood that; for those skilled in the art; do not departing under the prerequisite of the utility model principle; can also make some improvement, these improve and also should be considered as protection domain of the present utility model.

Claims (9)

1. a vibration-testing proficiency testing standard sample, is characterized in that: comprise the left support abutment (1) and the right support abutment (5) that connect by connecting cylinder (2), two rest bases are provided with lug, and right support abutment (5) right-end openings is by cover plate (7) sealing; There is the resonance beam (3) of a square-section at connecting cylinder (2) center, and resonance beam (3) left end is connected with left support abutment (1), and the long limit of square-section is vertical with bearing baseplane; Resonance beam (3) right-hand member is connected with square mass (6), and square mass (6) stretches out cover plate (7), and its side parallels with resonance beam (3) side, and upper plane is parallel with bottom surface of support saddle.

2. vibration-testing proficiency testing standard sample according to claim 1, is characterized in that: described resonance beam (3) is single rectangular beam, and its depth of section h is 2:1 with width B ratio.

3. vibration-testing proficiency testing standard sample according to claim 1, is characterized in that: the part of described square mass (6) in right support abutment (5) has deep-slotted chip breaker, the in-built flexible spacing O type circle of deep-slotted chip breaker (B2).

4. vibration-testing proficiency testing standard sample according to claim 1, is characterized in that: described square mass (6) is provided with fine setting quality loop (4) at right support abutment (5) inner port position.

5. vibration-testing proficiency testing standard sample according to claim 4, is characterized in that: described fine setting quality loop (4) and square mass (6) are threaded connection, and has regulated to fix with screw thread glue afterwards.

6. vibration-testing proficiency testing standard sample according to claim 1, is characterized in that: described resonance beam (3) is threaded connection with bearing, adopts screw thread glue to fix.

7. vibration-testing proficiency testing standard sample according to claim 5, is characterized in that: fixing by the first screw (B4) and nut (8) between resonance beam (3) and left support abutment, the upper cover of the first screw (B4) has fixed pin (B3).

8. vibration-testing proficiency testing standard sample according to claim 1, is characterized in that: right support abutment (5) right-end openings is connected by the second screw (B1) with cover plate (7).

9. vibration-testing proficiency testing standard sample according to claim 1, is characterized in that: right support abutment (5) inside is that diameter is the cylinder of d.