CN201191265Y - Shearing type large size material damping test device - Google Patents

Abstract

Disclosed is a shearing type large-sized material damping testing device, which relates to a testing device of the large-sized material damping property for civil engineering, and aims to resolve the problem that the shearing damping property of the large-sized material for the civil engineering can not be tested at present. Two input ends of a piezoelectric force transducer (5) are connected with output ends of a loading head (10) and an electromagnetic exciter (3), a laser displacement sensor (7) is arranged right above the electromagnetic exciter (3), an output end of the piezoelectric force transducer (5) is connected with an input end of a charge amplifier (6), two input ends of a voltage amplifier (8) are respectively connected with the laser displacement sensor (7) and an output end of the charge amplifier (6), two output ends of the voltage amplifier (8) are respectively connected with two input ends of a computer data acquisition unit (9), an input end of the electromagnetic exciter (3) is connected with a signal generator (1) via a power amplifier (2), and a base (14) is connected with a fixing external member (21). The shearing type large-sized material damping testing device can test the damping property and the elasticity modulus of the large-sized material under shearing action.

Description

Shearing type large size material damping testing device

Technical field

The utility model relates to the test unit of a kind of civil engineering work with the big size material damping performance.

Background technology

The test of visco-elastic damping material damping characteristic mainly is by the dynamic mechanical analysis instrument at present, instruments such as viscoelastic spectrometer are finished, the object of these device to test mainly is a metal, material such as plastics and polymkeric substance, and for the large scale material (as concrete, compound substance), these devices can't be measured because of the restriction of sample dimensions, the accurate assurance of civil engineering material kinematic behavior has great importance for the Accurate Analysis of structural vibration response, therefore exploitation is applicable to that the damping test device of large scale material is imperative, and existing damping test is mainly to be subjected to the curved main member that act as, as free beam, semi-girder, and at rarely having analysis based on the member of being cut.The feasible shearing damp characteristic that can't test civil engineering work large scale material (as concrete) at present of a series of problems such as theoretic imperfection and equipment development.

The utility model content

The purpose of this utility model provides a kind of shearing type large size material damping testing device, can't test the problem of civil engineering work with the shearing damp characteristic of large scale material at present to solve.

The utility model is to solve the problems of the technologies described above the technical scheme of taking to be: damping test device of the present utility model is made up of excitation system, measuring system, loading head, fixed sleeve part and base; Described excitation system is by signal generator, power amplifier, electromagnetic exciter is formed, described measuring system is by piezoelectric force transducer, laser displacement sensor, charge amplifier, voltage amplifier, the computer data acquiring device is formed, two input ends of described piezoelectric force transducer respectively with the output terminal of electromagnetic exciter, the lower surface of loading head connects, the output terminal of piezoelectric force transducer is connected with the input end of charge amplifier, be provided with laser displacement sensor directly over the described electromagnetic exciter, the output terminal of described laser displacement sensor is connected with an input end of voltage amplifier, the output terminal of charge amplifier is connected with another input end of voltage amplifier, the displacement signal output terminal of voltage amplifier is connected with an input end of computer data acquiring device, the electric charge amplifying signal output terminal of voltage amplifier is connected with another input end of computer data acquiring device, the input end of electromagnetic exciter is connected with the output terminal of power amplifier, the input end of power amplifier is connected with the output terminal of signal generator, described base is arranged on a side of electromagnetic exciter, and the upper surface of base is connected with the lower surface of fixed sleeve part.

The beneficial effects of the utility model are: the utility model can be tested the large scale material at the damping capacity and the elastic modulus that are subjected under the shear action, and device construction is simple, and is easy for installation.The length size adjustable of member to be measured can realize that different frequency, different wave load.Adopt the non-contact laser displacement transducer to improve the displacement measurement precision, the utility model is broken through the bottleneck that the big size material damping characteristic can't accurately be tested.

Description of drawings

Fig. 1 is an one-piece construction simplified schematic diagram of the present utility model, Fig. 2 front view that to be loading head 10 be assembled together with member 4 to be measured and piezoelectric force transducer 5, Fig. 3 is the left view (member 4 to be measured is not represented) of Fig. 2, Fig. 4 front view that to be fixed sleeve part 21 be assembled together with base 14 and member to be measured 4, Fig. 5 is the left view (base 14 and member to be measured 4 are not represented) of Fig. 4.

Embodiment

Embodiment one: in conjunction with Fig. 1 present embodiment is described, the damping test device of present embodiment is made up of excitation system, measuring system, loading head 10, fixed sleeve part 21 and base 14; Described excitation system is by signal generator 1, power amplifier 2, electromagnetic exciter 3 is formed, described measuring system is by piezoelectric force transducer 5, laser displacement sensor 7, charge amplifier 6, voltage amplifier 8, computer data acquiring device 9 is formed, two input ends of described piezoelectric force transducer 5 respectively with the output terminal of electromagnetic exciter 3, the lower surface of loading head 10 connects, realize the data acquisition of pressure, the output terminal of piezoelectric force transducer 5 is connected with the input end of charge amplifier 6, be provided with laser displacement sensor 7 directly over the described electromagnetic exciter 3, the output terminal of described laser displacement sensor 7 is connected with an input end of voltage amplifier 8, the output terminal of charge amplifier 6 is connected with another input end of voltage amplifier 8, the displacement signal output terminal of voltage amplifier 8 is connected with an input end of computer data acquiring device 9, the electric charge amplifying signal output terminal of voltage amplifier 8 is connected with another input end of computer data acquiring device 9, the input end of electromagnetic exciter 3 is connected with the output terminal of power amplifier 2, the input end of power amplifier 2 is connected with the output terminal of signal generator 1, described base 14 is arranged on a side of electromagnetic exciter 3, and the upper surface of base 14 is connected with the lower surface of fixed sleeve part 21.

The model of used instrument and the place of production see Table 1 in the present embodiment.

Table 1

Embodiment two: in conjunction with Fig. 1～Fig. 3 present embodiment is described, the loading head 10 of present embodiment is made up of first entablature 11, second sill 12, two first web members 13; Described first entablature 11 is arranged on first sill 12, the two ends of first entablature 11 and first sill 12 are connected by one first web member 13 respectively, the lower surface of first sill 12 is provided with groove 26, the upper end of described piezoelectric force transducer 5 is contained in the groove 26 of first sill, 12 lower surfaces, and described first web member 13 is made up of screw rod 30, nut 31; The stub end of described screw rod 30 is contained in the shoulder hole 32 of second sill, 12 lower surfaces.So be provided with, can make things convenient for the installation of the force transducer 5 and first sill 12.Other composition and annexation are identical with embodiment one.

Embodiment three: in conjunction with Fig. 1, Fig. 4, Fig. 5 present embodiment is described, the fixed sleeve part 21 of present embodiment is made up of second entablature 22, second sill 23, two second web members 24, two the 3rd web members 25; Described second entablature 22 is arranged on second sill 23, the two ends of second entablature 22 and second sill 23 are connected by one second web member 24 respectively, described second sill 23 is arranged on the base 14, and the two ends of second sill 23 are connected by one the 3rd web member 25 respectively with the two ends of base 14.So be provided with, can make things convenient for the adjusting of member 4 height to be measured.Other composition and annexation are identical with embodiment one.

Embodiment four: in conjunction with Fig. 1, Fig. 4, Fig. 5 present embodiment is described, second web member 24 of present embodiment is made up of first screw rod 16, first nut 17; The two ends of the lower surface of described second sill 23 are respectively equipped with shoulder counterbore 18, the stub end of described first screw rod 16 is contained in the shoulder counterbore 18 of second sill 23, and the screw rod end of first screw rod 16 passes second sill 23 and also is connected by first nut 17 with second entablature 22.So be provided with, convenient second sill 23 is connected with base 14.Other composition and annexation are identical with embodiment three.

Embodiment five: in conjunction with Fig. 1, Fig. 4, Fig. 5 present embodiment is described, the 3rd web member 25 of present embodiment is made up of the 3rd screw rod 19, the 3rd nut 20; Described second sill 23 is connected with the 3rd nut 20 by the 3rd screw rod 19 with base 14.So be provided with, easy to connect, can realize the adjusting of member 4 to be measured on Width and length direction.Other composition and annexation are identical with embodiment three.

Install for the rigidity that realizes electromagnetic exciter, electromagnetic exciter is installed on the rigid ground.The non-contact laser displacement transducer be arranged on electromagnetic exciter directly over, scalable and rotation measuring component ends stable state displacement response to be measured, and apply counter-force for member to be measured, have improved the displacement measurement precision.

Gather component ends stable state to be measured displacement by piezoelectric force transducer collection exciting force, laser displacement sensor, obtain both phase differential δ (rad), amplitude of exciting force p ₀(N), shearing-type component ends displacement amplitude to be measured y ₀(m), thus shearing-type material damping parameter can be drawn by following formula:

η＝tanδ (1)

$G^{\′\′}=\frac{8L}{{\mathrm{\π}}^2\mathrm{ab}}\frac{p_0}{y_0}\sin \mathrm{\δ}---\left(2\right)$

$G^{\′}=\frac{8L}{{\mathrm{\π}}^2\mathrm{ab}}\frac{p_0}{y_0}\cos \mathrm{\δ}---\left(3\right)$

In the formula:

η---the spillage of material factor

G "---the loss modulus (N/m of material ²)

Storage modulus (the N/m of G '---material ²)

The length (m) of L---shearing-type member to be measured

The height of a---shearing-type member to be measured is (along being cut direction, m)

The width (m) of b---shearing-type member to be measured

During test, member 4 to be measured is arranged between first entablature 11, second entablature 22 and first sill 12, second sill 23, and above-mentioned member is fixed together by two first web members 13 and two second web members 24, reduce as far as possible crooked bring influence boundary condition, limit the end corner of member 4 to be measured with this, the bottom of fixed sleeve part 21 is fixing by second sill 23, by second sill 23 vertical force is passed to base 14, and then passes to ground.The cross-sectional area of test member 4 is 100 * 100mm to the maximum ², in order to reduce the influence that bending brings, the length that needs control test member 4 is in 175mm～425mm scope.

Claims (4)

1, a kind of shearing type large size material damping testing device is characterized in that described damping test device is made up of excitation system, measuring system, loading head (10), fixed sleeve part (21) and base (14); Described excitation system is by signal generator (1), power amplifier (2), electromagnetic exciter (3) is formed, described measuring system is by piezoelectric force transducer (5), laser displacement sensor (7), charge amplifier (6), voltage amplifier (8), computer data acquiring device (9) is formed, two input ends of described piezoelectric force transducer (5) respectively with the output terminal of electromagnetic exciter (3), the lower surface of loading head (10) connects, the output terminal of piezoelectric force transducer (5) is connected with the input end of charge amplifier (6), be provided with laser displacement sensor (7) directly over the described electromagnetic exciter (3), the output terminal of described laser displacement sensor (7) is connected with an input end of voltage amplifier (8), the output terminal of charge amplifier (6) is connected with another input end of voltage amplifier (8), the displacement signal output terminal of voltage amplifier (8) is connected with an input end of computer data acquiring device (9), the electric charge amplifying signal output terminal of voltage amplifier (8) is connected with another input end of computer data acquiring device (9), the input end of electromagnetic exciter (3) is connected with the output terminal of power amplifier (2), the input end of power amplifier (2) is connected with the output terminal of signal generator (1), described base (14) is arranged on a side of electromagnetic exciter (3), and the upper surface of base (14) is connected with the lower surface of fixed sleeve part (21).

2, shearing type large size material damping testing device according to claim 1 is characterized in that described loading head (10) is made up of first entablature (11), second sill (12), two first web members (13); Described first entablature (11) is arranged on first sill (12), the two ends of first entablature (11) and first sill (12) are connected by one first web member (13) respectively, the lower surface of first sill (12) is provided with groove (26), and the upper end of described piezoelectric force transducer (5) is contained in the groove (26) of first sill (12) lower surface.

3, shearing type large size material damping testing device according to claim 1 is characterized in that described fixed sleeve part (21) is made up of second entablature (22), second sill (23), two second web members (24), two the 3rd web members (25); Described second entablature (22) is arranged on second sill (23), the two ends of second entablature (22) and second sill (23) are connected by one second web member (24) respectively, described second sill (23) is arranged on the base (14), and the two ends of second sill (23) are connected by one the 3rd web member (25) respectively with the two ends of base (14).

4, shearing type large size material damping testing device according to claim 3 is characterized in that described second web member (24) is made up of first screw rod (16), first nut (17); The two ends of the lower surface of described second sill (23) are respectively equipped with shoulder counterbore (18), the stub end of described first screw rod (16) is contained in the shoulder counterbore (18) of second sill (23), and the screw rod end of first screw rod (16) passes second sill (23) and also is connected by first nut (17) with second entablature (22).

Images