Dynamic assembly suspension dynamic characteristic test device
Technical field
The utility model belongs to the high frequency dynamic test field that the automobile power assembly cantilever type suspends, and particularly relates to a kind of dynamic assembly suspension dynamic characteristic test device.
Background technology
Along with the progress of society, people are more and more higher to vehicle ride comfort's requirement, and dynamic assembly suspension is playing vital role aspect isolation engine luggine, reduction car internal vibration and the noise.Therefore require dynamic assembly suspension under the little amplitude excitations of high frequency, should not occur dynamic hardening phenomenon too early, how authentic testing obtains being suspended at the dynamic perfromance under the high frequency pumping, especially the above high frequency dynamic exciting dynamic perfromance down of 400Hz is to the dynamic characteristic test proposition severe challenge that suspends.
Because the restriction of power assembly layout and design space, the cantilever type that the support that is connected with power assembly of now much suspending is designed to as shown in Figure 2 suspends.When this type of part is carried out dynamic performance testing, need take into full account the consistance on test border and actual entrucking border, promptly when frock designs, need allow direction that cylinder load the loads elastic centre point by rubber mounting, the frock that has caused connecting cylinder and power assembly side stand also is similar cantilever design.
In the past for the suspend design of test fixture of this type of cantilever type, connecting frock is to be formed by the aluminium block integral cutting, and fillet and intensity have only been considered, and do not consider frock self the constraint mode, and this type of cantilever type structure single order constraint mode is generally lower, when the high frequency characteristics test that suspends, encouraged the single order constraint mode that connects frock easily, the result of the feasible high frequency performance graph test that suspends is very undesirable.Cantilever type as shown in Figure 3 suspends the dynamic stiffness test result as can be known, the test result of former test fixture gained has produced a very high dynamic stiffness peak point near the 450Hz Frequency point, reason is that the single order constraint mode of frock is energized, and causes dynamic stiffness curve to be undergone mutation.High frequency dynamic property for true this cantilever type of acquisition suspends is necessary test fixture is improved.
Summary of the invention
Technical problem to be solved in the utility model provides a kind of dynamic assembly suspension dynamic characteristic test device, can effectively solve the power assembly cantilever design inaccurate problem of High Frequency Dynamic test result that suspends.
The technical scheme that its technical matters that solves the utility model adopts is: a kind of dynamic assembly suspension dynamic characteristic test device is provided, comprise and connect support, stiffening plate be connected pipe, the described connection support of going up is the U type, and U type two arm central structure hollow outs, stiffening plate is welded in and connects frame bottom, connects pipe and is connected and fixed on connection support U type two arms by bolt.
Described going up connects support, and stiffening plate is made by high-strength steel sheet, connects pipe and made by aluminum alloy materials.
New connection frock is made by two kinds of metal materials, on connect support and form by 45# steel cutting, stiffening plate is to be made by steel plate, with on be connected the mode of support by welding and connect, connections pipe is an aluminum alloy materials, with reduction test fixture quality.
Described proving installation integral body has the crooked constraint of higher single order mode, and the high frequency dynamic performance testing helps suspending.
Beneficial effect
The utility model advantage is as follows:
1, the utility model can guarantee that test fixture has enough big bending stiffness by appropriate design frock inner structure, and quality is reduced to minimumly as far as possible, has greatly improved the resonant frequency of test fixture.
2, the utility model light weight, can save the frock starting material.
3, the utility model can effectively suppress the high frequency dynamic abnormal feature that cantilever type suspends.
Description of drawings
Fig. 1 is a synoptic diagram of the present utility model.
Fig. 2 is the dynamic assembly suspension connection diagram.
Fig. 3 is that the measured high frequency dynamic property that suspends of the utility model and former test fixture compares.
Embodiment
Below in conjunction with specific embodiment, further set forth the utility model.Should be understood that these embodiment only to be used to the utility model is described and be not used in the restriction scope of the present utility model.Should be understood that in addition those skilled in the art can make various changes or modifications the utility model after the content of having read the utility model instruction, these equivalent form of values fall within the application's appended claims institute restricted portion equally.
Embodiment 1
As shown in Figure 1, a kind of dynamic assembly suspension proving installation, by last connection support 1, stiffening plate 2, connecting pipe 3 forms, the described connection support 1 of going up is connected with the cylinder of testing apparatus, and described stiffening plate 2 is welded on the downside that connects support, and described connection pipe 3 connects and upward connects support and mounting bracket.
The high frequency dynamic property that application the utility model test cantilever type as shown in Figure 2 suspends as shown in Figure 3, excitation frequency is in 500Hz, the no tangible abnormal occurrence that suspends occurs, thus the truer High Frequency Dynamic that suspends that characterized, for design on Mounting System provides true foundation.