CN102735486A - Device for testing indicator characteristic of magnetorheological damper - Google Patents

Abstract

The invention discloses a device for testing the performance characteristics of a magnetorheological damper, which includes a mechanical stand, a cam excitation unit, a power supply system for the magnetorheological damper, and a sensor testing system. The test device has a simple overall electromechanical structure, especially a combined flat bottom transmission mechanism is used in the cam transmission mechanism. Compared with the rectangular frame structure in the traditional equal-width cam mechanism, it is more convenient to install and disassemble, and the processing is simpler; The frequency conversion speed regulation system adopts ordinary three-phase asynchronous motor, which is cheaper than the frequency conversion speed regulation motor. The device can test the display power characteristics and speed characteristics of the magneto-rheological damper, and its working performance is stable and reliable, simple and practical.

Description

A test device for indicating dynamometer characteristics of a magneto-rheological damper

technical field

The invention relates to an electromechanical test device, in particular to a test device for the display performance characteristic of a magneto-rheological damper.

Background technique

Magneto-rheological damper is a semi-active damping device using intelligent controllable fluid-magneto-rheological fluid. Its damping force is regulated by its driving current. It is widely used in structural vibration control of automobiles, bridges, and buildings. field. One of the main contents of the magnetorheological damper test is the measurement of its indicator characteristic (also known as the resistance characteristic), that is, the magnetorheological damper performs relative simple harmonic motion at both ends under the specified stroke and test frequency, and its resistance varies with The changing nature of the displacement. The simple harmonic motion excitation methods in the measurement of dynamometer characteristics usually include electric type, electro-hydraulic type, and mechanical cam/eccentric wheel type. Among them, the mechanical cam/eccentric wheel excitation method is simple in structure, easy to install, and low in cost compared with the former two. The Chinese invention patent CN101738329B published on October 26, 2011 discloses an eccentric wheel excitation mechanism (that is, a traditional equal-width cam mechanism) for performance testing of a magnetorheological damper, which uses a frequency converter, a motor and a reducer , eccentric wheel, rectangular frame, and a transmission chain composed of a sliding shaft integrated with the rectangular frame to drive the damper for reciprocating linear motion. The eccentric wheel is the driving part, and the rectangular frame is the driven part. The upper and lower walls of the inner frame of the rectangular frame are always in contact with the curved contour of the eccentric wheel to realize the reciprocating linear motion in the upper and lower directions and meet the requirements of the damper characteristic test. However, the rectangular frame in this traditional equal-width cam mechanism is a hollow polyhedron with a box-like structure. The structure is relatively complicated, and the processing requires high precision and is relatively inconvenient. It needs further improvement. At the same time, the patent does not specify whether the motor used is a variable-frequency speed-regulating motor or a common three-phase asynchronous motor. Other existing technologies for performance testing of magneto-rheological dampers often use variable-frequency speed-regulating motors to drive cams, but the cost of frequency-variable speed-regulating motors is relatively high, and their prices are generally 2 to 3 times the price of ordinary three-phase asynchronous motors of the same power .

Contents of the invention

The technical problem to be solved by the present invention is to provide a magneto-rheological damper indicator dynamometer testing device, design a set of dynamometer testing system with a simpler and more effective overall electromechanical structure, and use a cam that is simpler than the traditional equal-width cam mechanism The transmission mechanism and the ordinary three-phase asynchronous motor with lower cost can meet the test requirements of the dynamometer characteristics of the magneto-rheological damper, and realize the purpose of simplicity and practicality.

In order to solve the problems of the technologies described above, the present invention adopts the following technical solutions:

A magneto-rheological damper indicator performance test device includes a mechanical bench, a cam excitation unit, a magneto-rheological damper power supply system, and a sensor test system.

The mechanical stand is composed of a base, a frame and damper components; the frame includes a left rear channel steel column, a right rear channel steel column, a rear connecting plate, a beam, a front connecting plate, a right front channel steel column, a left front channel steel column The lower ends of the four channel steel columns perpendicular to the base are respectively welded on a base plate, and the base plate is fixed on the base through bolt connection; the rear connecting plate is fixed on the upper part of the left rear channel steel column and the right rear channel steel column through bolt connection, The front connecting plate is fixed on the upper end of the right front channel steel column and the left front channel steel column through bolt connection; the beam is fixed between the rear connecting plate and the front connecting plate through screw connection; the damper components include magnetorheological damper, damper The connecting piece, the lower connecting piece of the damper and the stud bolts, the upper connecting piece of the damper, and the lower connecting piece of the damper are respectively connected to the magneto-rheological damper through cylindrical pins, and the stud bolts are connected to the upper connecting piece of the damper and the tensile force between sensors.

The cam excitation unit is composed of a frequency converter, an ordinary three-phase asynchronous motor, a shaft coupling, a camshaft, a bearing with a seat, and a cam mechanism; the cam mechanism includes a cam, a cam upper plate, a linear bearing, a guiding polished rod, and a polished rod support , connecting shaft, and cam lower plate; the frequency converter is connected to the ordinary three-phase asynchronous motor through a cable; one end of the coupling is connected to the output shaft of the ordinary three-phase asynchronous motor, and the other end is connected to the camshaft; the camshaft is supported by a bearing with seat, and the camshaft The transmission is connected with the cam through a key; the upper end and the lower end of the cam are in contact with the upper cam plate and the lower cam plate respectively, and the upper cam plate and the lower cam plate are connected by connecting shafts, nuts, and spring washers to form a combined overall flat bottom transmission mechanism; The linear bearing is fixed on the cam upper plate with screws; one end of the guide polished rod is fixed on the polished rod support, and the other end passes through the inner hole of the linear bearing. The upper cam plate and the lower connecting piece of the damper are connected by bolts.

The magnetorheological damper power supply system includes a DC stabilized power supply, a constant current source and an AC/DC ammeter; the DC stabilized power supply is connected to the constant current source through a cable to provide operating voltage; the constant current source is connected to the magnetic current source through a cable The variable damper is used to supply power for it; the AC and DC ammeter is used to detect the current input to the magnetorheological damper.

Described sensor test system is made up of tension pressure sensor, displacement sensor, data acquisition card, computer; Tension pressure sensor is fixed on the middle position of crossbeam lower surface with bolt, and displacement sensor is installed between crossbeam and cam upper plate; One end of data acquisition card Connect the pull pressure sensor and the displacement sensor, and connect the other end with the computer.

Compared with the background technology, the present invention has the beneficial effects that the magneto-rheological damper indicator dynamometer characteristic testing device adopted has a simple overall electromechanical structure, is easy to install, low in cost, stable and reliable in performance, simple and practical. Among them, the cam mechanism adopts a combined flat-bottom transmission mechanism composed of cam upper plate, cam lower plate and connecting shaft. Compared with the traditional rectangular frame structure in equal-width cam mechanism, the processing is simpler, the installation and disassembly are more convenient, and the structure is simpler. It is flexible; using a common three-phase asynchronous motor as a power source has a lower cost than the frequency conversion speed regulating motor commonly used in the prior art.

Description of drawings

The present invention will be further described below in conjunction with drawings and embodiments.

Fig. 1 is a structural diagram of a rectangular frame in a prior art equal-width cam mechanism.

Fig. 2 is a top view of the device for testing the dynamometer characteristic of the magneto-rheological damper of the present invention.

Fig. 3 is a sectional view along line A-A in Fig. 2 .

Fig. 4 is a sectional view along line B-B in Fig. 2 .

Fig. 5 is an overall schematic diagram of the electromechanical system of the magneto-rheological damper indicator performance testing device of the present invention.

In the figure: base 1, frequency converter 2, three-phase asynchronous motor 3, coupling 4, camshaft 5, bearing with seat 6, tension pressure sensor 7, stud bolt 8, damper upper connector 9, magnetorheological Damper 10, damper lower connector 11, displacement sensor 12, cam 13, left rear channel steel column 14, right rear channel steel column 15, rear connecting plate 16, crossbeam 17, front connecting plate 18, right front channel steel column 19 , left front channel steel column 20, cam upper plate 21, linear bearing 22, guide polished rod 23, polished rod support member 24, connecting shaft 25, cam lower plate 26, eccentric wheel 27, slide shaft 28.

Detailed ways

Figure 1 shows an eccentric wheel excitation mechanism capable of reciprocating linear motion disclosed in the Chinese invention patent CN101738329B mentioned in the background technology section above, that is, a traditional equal-width cam mechanism. Eccentric wheel 27 rotates among Fig. 1, drives follower-sliding shaft 28 to do reciprocating linear motion, and the upper and lower two walls of the rectangular frame inner frame on the sliding shaft 28 contact and tangent with the curve profile of eccentric wheel 27 all the time. The rectangular frame in this traditional equal-width cam mechanism is a hollow box-shaped polyhedron with a relatively complex structure. The surface processing of the upper and lower walls of the inner frame that contacts the contour of the eccentric wheel requires high precision and is relatively inconvenient.

As shown in Figure 2, Figure 3, Figure 4, and Figure 4, the magneto-rheological damper indicator performance test device of the present invention includes a mechanical bench, a cam excitation unit, a magnetorheological damper power supply system, and a sensor test system At the same time, improvements are made for the selection of medium-width cam mechanisms and drive motors in the prior art. Wherein, the mechanical stand is composed of a base 1, a frame and damper components. Described framework comprises left rear channel steel column 14, right rear channel steel column 15, rear connection plate 16, crossbeam 17, front connection plate 18, right front channel steel column 19, left front channel steel column 20. Four channel steel uprights 14, 15, 19, 20 are perpendicular to the base 1 and are all welded on a base plate respectively, and the base plate is fixed on the base 1 through bolt connection. Back connecting plate 16 is fixed on the upper end part of left rear channel steel column 14, right rear channel steel column 15 by bolt connection, and front connecting plate 18 is fixed on the upper end part of right front channel steel column 19, left front channel steel column 20 by bolt connection. The beam 17 is fixed between the rear connecting plate 16 and the front connecting plate 18 by screws. The damper component is composed of a magneto-rheological damper 10, an upper connector 9 of the damper, a lower connector 11 of the damper and a stud 8. The magnetorheological damper 10 is respectively connected to the upper connector 9 of the damper, the damper The lower connector 11 of the damper is connected, and the upper connector 9 of the damper is connected to the tension and pressure sensor 7 through the stud bolt 8 . The cam excitation unit is composed of a frequency converter 2, a common three-phase asynchronous motor 3, a shaft coupling 4, a camshaft 5, a bearing with seat 6 and a cam mechanism, and the cam mechanism includes a cam 13, a cam upper plate 21, a linear bearing 22. Guide polished rod 23, polished rod support 24, connecting shaft 25, cam lower plate 26. The frequency converter 2 is connected with an ordinary three-phase asynchronous motor 3 through a cable. One end of the coupling 4 is connected to the output shaft of the common three-phase asynchronous motor 3 , and the other end is connected to the camshaft 5 . The camshaft 5 is supported by the seated bearing 6, and the camshaft 5 and the cam 13 are connected and driven by a key. The upper end and the lower end of the cam 13 are in contact with the upper cam plate 21 and the lower cam plate 26 respectively, and the upper cam plate 21 and the lower cam plate are in contact with each other. 26 is connected by connecting shaft 25, nuts, and spring washers to form a combined flat-bottom transmission mechanism. The linear bearing 22 is fixed on the cam upper plate 21 with screws, and the cam upper plate 21 is connected with the damper lower connector 11 with bolts, and guides the light bar One end of 23 is fixed on the polished rod support member 24, and the other end passes through the inner hole of the linear bearing 22. The magnetorheological damper power supply system includes a DC stabilized power supply, a constant current source and an AC/DC ammeter. The DC stabilized power supply is connected to the constant current source through a cable, and the constant current source is connected to the magnetorheological damper through a cable. An ammeter is used to detect the current input to the magnetorheological damper. The sensor testing system is composed of a tension sensor, a displacement sensor, a data acquisition card, and a computer. The tension sensor is fixed on the middle position of the lower surface of the beam with bolts, and the displacement sensor is installed between the beam and the upper plate of the cam. One end of the data acquisition card Connect the pull pressure sensor and the displacement sensor, and connect the other end to the computer.

Working process of the present invention is as follows:

The frequency converter 2 drives the ordinary three-phase asynchronous motor 3 to rotate, drives the camshaft 5 through the coupling 4, and the camshaft 5 drives the rotation of the cam 13 through a key connection transmission, and the cam 13 drives the combination composed of the upper cam plate 21 and the lower cam plate 26 The integral flat-bottomed transmission mechanism of the type makes a reciprocating linear motion, drives the lower connector 11 of the damper, and the piston rod at the lower end of the magnetorheological damper 10 to make a reciprocating linear motion, and the upper end of the magnetorheological damper 10 passes through the upper connector 9 of the damper. The head bolt 8, the tensile pressure sensor 7 and the crossbeam 17 are connected and fixed as a whole, so as to realize the relative movement of the two ends of the damper required by the dynamometer characteristic test of the magneto-rheological damper, and the contour curve shape of the cam 13 can be designed to obtain the required The required law of simple harmonic motion. At the same time, the power supply system of the magnetorheological damper starts to work: the DC stabilized power supply is connected to the constant current source through a cable to provide working voltage for the constant current source; the constant current source is connected to the magnetorheological damper through a cable to provide the magnetorheological The damper is powered; the AC and DC ammeter is used to detect the current input to the magnetorheological damper. When the magnetorheological damper is in the normal test working state, the tension pressure sensor and the displacement sensor in the sensor test system respectively measure the damping force of the magnetorheological damper and the relative displacement of both ends of the damper, and then send it to the The computer performs corresponding data processing and calculation in the computer, and finally obtains the indicator work characteristic curve and corresponding data of the magneto-rheological damper.

The above specific embodiments are used to explain the present invention, rather than to limit the present invention. On the premise of not departing from the spirit and scope of the present invention, the present invention can also have various changes and improvements, and these changes and improvements all fall within the scope of this invention. within the scope of protection of the invention.

Claims (3)

1. A magneto-rheological damper dynamometer characteristic testing device, comprising a mechanical bench, a cam excitation unit, a magnetorheological damper power supply system, and a tension sensor (7), a displacement sensor (12), a data A sensor testing system composed of acquisition card and computer is characterized in that: 1) The mechanical stand is composed of a base (1), a frame and damper components; the frame includes a left rear channel steel column (14), a right rear channel steel column (15), a rear connecting plate (16), a beam (17), front connecting plate (18), right front channel steel column (19), left front channel steel column (20); the lower ends of four channel steel columns (14, 15, 19, 20) perpendicular to the base (1) respectively Welded on a base plate, the base plate is fixed on the base (1) by bolt connection; the rear connecting plate (16) is fixed on the upper end part of the left rear channel steel column (14) and the right rear channel steel column (15) by bolt connection, The front connecting plate (18) is fixed on the upper part of the right front channel steel column (19) and the left front channel steel column (20) by bolt connection; the crossbeam (17) is fixed on the rear connecting plate (16) and the front connecting plate (18) ); the damper components include the magneto-rheological damper (10), the upper connector of the damper (9), the lower connector of the damper (11) and the stud bolts (8), and the upper connector of the damper (9) , The lower connector (11) of the damper is connected to the magneto-rheological damper (10) respectively through cylindrical pins, and the stud bolt (8) is connected between the upper connector (9) of the damper and the tension pressure sensor (7) ; 2) The cam excitation unit is composed of a frequency converter (2), an ordinary three-phase asynchronous motor (3), a shaft coupling (4), a camshaft (5), a bearing with seat (6), and a cam mechanism; the cam mechanism Including cam (13), cam upper plate (21), linear bearing (22), guide polished rod (23), polished rod support (24), connecting shaft (25), cam lower plate (26); frequency converter (2 ) is connected with the ordinary three-phase asynchronous motor (3) through a cable; one end of the shaft coupling (4) is connected with the output shaft of the ordinary three-phase asynchronous motor (3), and the other end is connected with the camshaft (5); the camshaft (5) is connected by a belt The seat bearing (6) is supported, the camshaft (5) and the cam (13) are connected and driven by a key; the upper end and the lower end of the cam (13) are respectively in contact with the cam upper plate (21) and the cam lower plate (26), and the cam The upper plate (21) and the lower cam plate (26) are connected to form a combined flat-bottom transmission mechanism through connecting shafts (25), nuts and spring washers; the linear bearing (22) is fixed on the cam upper plate (21) with screws; One end of the guide polished rod (23) is fixed on the polished rod support (24), and the other end passes through the inner hole of the linear bearing (22). Connect with bolts between the cam upper plate (21) and the lower connector (11) of the damper. 2. The magneto-rheological damper indicator dynamometer characteristic testing device according to claim 1, wherein the magneto-rheological damper power supply system includes a DC stabilized power supply, a constant current source and an AC-DC ammeter; The stabilized power supply is connected to the constant current source through a cable to provide control voltage; the constant current source is connected to the magnetorheological damper (10) through a cable to supply power to it; the AC and DC ammeter is used to detect the input to the magnetorheological damper (10). 10) Current. 3. The magneto-rheological damper indicator performance characteristic testing device according to claim 1, characterized in that, the common three-phase asynchronous motor (3) in the cam excitation unit is specifically modeled as Y132M- 8. Y2 series three-phase asynchronous motors can also be used.

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