CN103698123A - Two-degree-of-freedom centrifugal vibration combined measuring device - Google Patents
Two-degree-of-freedom centrifugal vibration combined measuring device Download PDFInfo
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- CN103698123A CN103698123A CN201410010026.4A CN201410010026A CN103698123A CN 103698123 A CN103698123 A CN 103698123A CN 201410010026 A CN201410010026 A CN 201410010026A CN 103698123 A CN103698123 A CN 103698123A
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Abstract
The invention relates to a two-degree-of-freedom centrifugation and vibration combined measuring device, which is characterized in that the device comprises a base (1), a centrifugal vibrating mechanism, a data acquisition device, a transmission system and a driving device; the centrifugal vibrating mechanism is fixedly arranged on the base (1); the centrifugal vibrating mechanism and the driving device are connected through the transmission system; the data acquisition device is used for recording movement rules of a two-degree-of-freedom vibrating system when an experiment occurs; the data acquisition device is fixedly arranged at the top end of a vertical hollow pipe through a clamping block (14) and is also arranged right at the upper end of a mass block (13); the two-degree-of-freedom vibrating system and the data acquisition device are fixedly arranged on a support (10); the support (10) is fixedly arranged on a sliding block; the driving device comprises a motor system which is fixedly arranged on the base (1) and is used for providing driving force to the centrifugal vibrating mechanism, a motor driver and a main control device which is used for controlling a stepping motor (4) to apply driving force on the centrifugal vibrating mechanism.
Description
Technical field
The present invention relates to the experimental provision field of Rigid-flexible Coupling Dynamics, particularly a kind of double freedom Centrifugal vibration duplex measurement device.
Background technology
The dynamic characteristic of rotational structure and dynamic response analysis are the theoretical foundation that is rotated machinery and rotational structure reliability design and safety evaluatio.While carrying out wind turbines rotor, helicopter screw propeller, impeller wheel of centrifugal machine and blade design thereof, it is the foundation of material selection and structure optimization that the characteristic frequency of understanding rotational structure changes, and also for avoiding mesomerism to implement control strategy, provides key parameter.The dynamic analysis of rotational structure relates to the distortion of structure and stress state etc., for malformation control and strength check, determine that dynamic test scheme provides basic analysis data.Because rotational structure operates under Centrifugal Environment, the elastic deformation of structure self is coupled with rotatablely moving, and causes Centrifugal Environment to have a strong impact on dynamic characteristic and the dynamic response of structure.
The particle motion trace of Centrifugal vibration system and vibration starting condition, vibration rigidity, rigid body rotating speed are relevant with initial eccentricity distance.Point movement locus consists of non-eccentricity motion and eccentric motion two parts, vibration starting condition, vibration rigidity and rigid body rotating speed are depended in non-eccentricity motion, eccentric motion depends on initial eccentricity distance, vibration rigidity and rigid body rotating speed, certain with vibration rigidity when initial eccentric distance, the vibration amplitude of eccentric motion increases with rigid body rotating speed.Having in initial eccentricity situation, there is critical rigid body rotating speed in Centrifugal vibration system, over particle vibration amplitude after critical rotary speed, raises rapidly.For the linear elasticity vibrational system under large overall motions, be the vibration in retention wire elastic range, should consider critical rigid body rotating speed.Therefore, being correctly familiar with and analyzing the characteristic frequency variation of rotational structure, is the key issue of research rotary body self-deformation and rotary body coupling.
Summary of the invention
The invention provides a kind of double freedom Centrifugal vibration duplex measurement device so that observation and analysis when elastic body rotates self distortion and rotate the variation of coupling to rotational structure characteristic frequency
A kind of double freedom Centrifugal vibration duplex measurement device involved in the present invention, comprises pedestal 1, Centrifugal vibration mechanism, data collector, kinematic train, drive unit;
Described Centrifugal vibration mechanism is fixed on pedestal 1, and Centrifugal vibration mechanism is connected by kinematic train with drive unit; Centrifugal vibration mechanism is by the light flexible bar 11 perpendicular to support 10, chuck 12, mass 13 and pivot arm form, light flexible bar 11 is connected by chuck 12 with mass 13, mass 13 is placed in the top of light flexible bar 11, light flexible bar 11, chuck 12, mass 13 is fixed on pivot arm and forms double freedom vibrational system, and double freedom vibrational system is rotated and done double freedom Centrifugal vibration with pivot arm;
The characteristics of motion of double freedom vibrational system described in when described data collector occurs for recording experiment, data collector is fixed on vertical hollow tubular top by fixture block 14, is also positioned at the positive upper end of mass 13 simultaneously; Double freedom vibrational system and data collector are fixed on support 10, pivot arm is by base 5, form through two hollow tubulars 9 of base 5 and the pipe clamp 8 that is placed in hollow tubular 9 two ends, is useful on the fixedly slide block 6 of double freedom vibrational system and data collector between base 5 and pipe clamp 8; Support 10 is fixed on slide block, and slide block 6 can slide on pivot arm;
Described drive unit comprise be fixed on pedestal 1 for the electric system of driving force is provided to Centrifugal vibration mechanism, motor driver and apply the master control set of driving force for control step motor 4 to Centrifugal vibration mechanism; Stepper motor 4 is fixed on pedestal 1;
The gear worm mechanism of described kinematic train in transmission case 2 and the transmission case 2 being placed between pedestal 1 and pivot arm form; Transmission case 2 is fixed on the geometric center of pedestal 1, and kinematic train is connected with pivot arm in the rotating shaft of base by being positioned at transmission case 2 central vertical
Double freedom Centrifugal vibration duplex measurement device provided by the invention, by primary controller, the namely control of PC end, to stepper motor driver pipage control signal and make motor driver input different motions to stepper motor.Pivot arm is realized rotation by kinematic train, and the characteristics of motion of double freedom vibrational system can be collected by the data collector that be arranged on pivot arm on integrated with it, and is returned to master controller, and PC end is processed.
Accompanying drawing explanation:
The structural representation of the double freedom Centrifugal vibration duplex measurement device that Fig. 1 provides for example of the present invention,
Fig. 2 is the top view of part of data acquisition,
Fig. 3 is the front elevation of chuck 12;
In above-mentioned figure, 1 pedestal, 2 transmission cases, 3 index dials, 4 stepper motors, 5 bases, 6 slide blocks, 7 balancing weights, 8 pipe clamps, 9 hollow tubulars, 10 supports, 11 light flexible bars, 12 chucks, 13 masses, 14 fixture blocks, 15 cameras, 16 stand tubes.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
The double freedom Centrifugal vibration duplex measurement device that the present embodiment is related, its structure is as Fig. 1, Fig. 2, shown in.
The present embodiment provides a kind of double freedom Centrifugal vibration duplex measurement device, comprise: pedestal 1, be fixed on the Centrifugal vibration mechanism on described pedestal 1, for above-mentioned Centrifugal vibration mechanism provides the drive unit of power input, for above-mentioned Centrifugal vibration mechanism and above-mentioned drive unit provide the kinematic train of connection.It focuses on, and described Centrifugal vibration mechanism comprises: the pivot arm that can rotate at surface level being connected with described kinematic train, for testing required centrifugal motion; Be fixed on the double freedom vibrational system on pivot arm, for do double freedom Centrifugal vibration when described pivot arm rotates.With the data collector of double freedom vibrational system integrated solid on pivot arm, the characteristics of motion of double freedom vibrational system while testing generation for recording.Wherein pivot arm comprise base 6, through two hollow tubulars 9 of base 6 be placed in the pipe clamp 8 at hollow tubular 9 two ends.Wherein, pivot arm is axis of symmetry centered by base 5 center pits, is also useful on the fixedly slide block 6 of double freedom vibrational system and described data collector between base 5 and described pipe clamp 8.Double freedom vibrational system comprises perpendicular to the light flexible bar 11 of base and is placed in the mass 13 of described light flexible masthead end.
The double freedom Centrifugal vibration duplex measurement device that example of the present invention provides, by computer-controlled program, to motor pipage control signal, makes rotating mechanism carry out at the uniform velocity or variable motion with the angular velocity of setting.
In order to obtain comparatively ideal experimental data, the end face diameter of light flexible bar 11 should remain on below 3mm, and its radial dimension is that 50 times of horizontal size are above for good.In the present embodiment, light flexible bar 11 end face diameters are chosen the hollow stem of 2mm, and its length interval is that 150～250mm is advisable, rods is long, and to be subject to external interference large, and oscillating movement is distortion likely, and rods is too short, amplitude is little, is unfavorable for the post-processed of data.It is 50～100g that mass 13 is chosen quality.In the present embodiment, mass is a bottom surface radius 30mm, the cylinder of high 10mm, and quality is about 60g.Mass 13 is connected by chuck 12 with light flexible bar 11.Chuck 12 as shown in Figure 3, is one " protruding " font web member, and mass and chuck are screwed, and inserts one end of the light flexible bar 12 of " protruding " font chuck top circular hole and passes through the screw-clamped of chuck sidepiece.The other end of light weight beam is connected with support 10 with chuck 12 equally.Chuck 12 is screwed, can be for convenience detach, and can adjust easily the height of light weight beam 11 and mass 13.Support 10, as double freedom vibrational system and the common base of data collector, is fixed on the geometric center place of slide block 6.
Data collector is connected by radio communication with main control end, therefore can hold Real Time Observation moving image at PC, and intercepts good moving image by matlab routine processes.
Preferably, hollow tubular 9, stand tube 16 is cylinder type hollow pipe.Select hollow tubular to reduce the quality of whole rotary system.
The brachium of pivot arm is probably in about 200～300mm, the balancing weight 7 on pivot arm in theory should with pivot arm on double freedom vibrational system and the quality of data collector suitable, make system keep balance.Mass can be by adjusting its quality and adjusting the object that its position reaches balanced system.
Be fixed on the engine that the stepper motor on pedestal is whole system, select stepper motor to be because it is by pulse signal controlled motion, easy operating and adjustment, because the precision of every step is 3 percent to 5 percent, and the accumulation of error of a step can not arrived to next step, thereby there is the repeatability of good positional precision and motion; And stepper motor can be outstanding start-stop and reversion response, make motion process smooth-out;
Because stepper motor is direct current supply, therefore need a galvanic current source.In the present embodiment, the rated voltage of direct supply is 24V, and rated current is 3.2A.
For the simple control of PC end, in the present embodiment, also have an Electric Machine Control driver, it can support RS232 and RS485 to carry out communication simultaneously, built-in senior motion controller can carry out acceleration and deceleration motion.Electric Machine Control driver, as the intermediary of motor and PC end, can be convenient to use software and send motion command at PC end.
Kinematic train is comprised of with the worm gear that is connected pivot arm central rotating shaft the worm screw that connects machine shaft.Because motor speed is too high, cannot meet the slow-speed of revolution requirement of two free oscillating systems, so the high-speed rotation of motor is converted into take by worm and gear speed-reduction apparatus the low speed rotation that pivot arm center is rotating shaft.
Each example in this instructions adopts the mode of going forward one by one to describe, and each embodiment stresses is the difference with other embodiment, between each embodiment identical similar part mutually referring to.
The present invention will can not be restricted to embodiment illustrated herein, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (1)
1. a double freedom Centrifugal vibration duplex measurement device, is characterized in that: this device comprises pedestal (1), Centrifugal vibration mechanism, data collector, kinematic train, drive unit;
It is upper that described Centrifugal vibration mechanism is fixed on pedestal (1), and Centrifugal vibration mechanism is connected by kinematic train with drive unit; Centrifugal vibration mechanism is by the light flexible bar (11) perpendicular to support (10), chuck (12), mass (13) and pivot arm form, light flexible bar (11) is connected by chuck (12) with mass (13), mass (13) is placed in the top of light flexible bar (11), light flexible bar (11), chuck (12), mass (13) is fixed on pivot arm and forms double freedom vibrational system, and double freedom vibrational system is rotated and done double freedom Centrifugal vibration with pivot arm;
The characteristics of motion of double freedom vibrational system described in when described data collector occurs for recording experiment, data collector is fixed on vertical hollow tubular top by fixture block (14), is also positioned at the positive upper end of mass (13) simultaneously; Double freedom vibrational system and data collector are fixed on support (10), pivot arm is by base (5), form through two hollow tubulars (9) of base (5) and the pipe clamp (8) that is placed in hollow tubular (9) two ends, is useful on the fixedly slide block (6) of double freedom vibrational system and data collector between base (5) and pipe clamp (8); It is upper that support (10) is fixed on slide block (6), and slide block (6) can slide on pivot arm;
Described drive unit comprise be fixed on pedestal (1) for the electric system of driving force is provided to Centrifugal vibration mechanism, motor driver and apply the master control set of driving force to Centrifugal vibration mechanism for control step motor (4); Stepper motor (4) is fixed on pedestal (1);
The gear worm mechanism of described kinematic train in transmission case (2) and the transmission case (2) being placed between pedestal (1) and pivot arm form; Transmission case (2) is fixed on the geometric center of pedestal (1), and kinematic train is by being positioned at transmission case (2) center and being connected with pivot arm perpendicular to the rotating shaft of base.
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| CN201410010026.4A CN103698123A (en) | 2014-01-09 | 2014-01-09 | Two-degree-of-freedom centrifugal vibration combined measuring device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104075863A (en) * | 2014-07-21 | 2014-10-01 | 苏州广博力学环境实验室有限公司 | Vibration and centrifugation composite-testing equipment |
| CN110348166A (en) * | 2019-07-19 | 2019-10-18 | 辽宁工程技术大学 | A kind of virtual materials parameter visualization recognition methods of basalt fibre resin concrete joint surface |
Citations (4)
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| JPH10300639A (en) * | 1997-04-25 | 1998-11-13 | Hitachi Ltd | Centrifugal force loader |
| RU2239808C2 (en) * | 2002-11-26 | 2004-11-10 | Российский Федеральный Ядерный Центр - Всероссийский Научно-Исследовательский Институт Экспериментальной Физики | Bench for testing article on vibration and linear accelerations |
| CN101936802A (en) * | 2010-07-27 | 2011-01-05 | 南昌大学 | New structural shock excitation experimental device |
| CN202475548U (en) * | 2011-12-20 | 2012-10-03 | 南京硕航机电有限公司 | Mobile phone test rotary table |
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2014
- 2014-01-09 CN CN201410010026.4A patent/CN103698123A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10300639A (en) * | 1997-04-25 | 1998-11-13 | Hitachi Ltd | Centrifugal force loader |
| RU2239808C2 (en) * | 2002-11-26 | 2004-11-10 | Российский Федеральный Ядерный Центр - Всероссийский Научно-Исследовательский Институт Экспериментальной Физики | Bench for testing article on vibration and linear accelerations |
| CN101936802A (en) * | 2010-07-27 | 2011-01-05 | 南昌大学 | New structural shock excitation experimental device |
| CN202475548U (en) * | 2011-12-20 | 2012-10-03 | 南京硕航机电有限公司 | Mobile phone test rotary table |
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| 冉光斌等: "《土工二维振动离心机转臂的设计研究》", 《工程设计学报》 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104075863A (en) * | 2014-07-21 | 2014-10-01 | 苏州广博力学环境实验室有限公司 | Vibration and centrifugation composite-testing equipment |
| CN110348166A (en) * | 2019-07-19 | 2019-10-18 | 辽宁工程技术大学 | A kind of virtual materials parameter visualization recognition methods of basalt fibre resin concrete joint surface |
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Application publication date: 20140402 |