The quiet deflection constraint device of body in white and method for detecting static rigidity
The present invention relates to a kind of car white vehicle vehicle body static rigidity and detect, refer more particularly to the restraint device of the quiet rigidity of body in white and the detection method of quiet rigidity, torsional rigidity and the bending stiffness of vehicle body are tested fast.
The full bearing structure of the most employing of passenger vehicle body, the quiet rigidity of vehicle body generally comprises torsional rigidity and bending stiffness, vehicle body is almost carrying all torsions and bending load in the passenger car use procedure, the quiet rigidity of vehicle body has a significant effect to comfort property, endurance quality and the dynamic response performance etc. of automobile, therefore, the quiet rigidity of passenger vehicle body is to need the matter of utmost importance considered in the body structure design process.The quiet rigidity property test of vehicle body at present is mainly to utilize the ripe softwares such as CAD, CAE, by vehicle body is carried out d solid modeling, then utilize Finite Element Method analysis, observe body in white and the distortion of structural member under various different loads effects thereof, thereby obtain the mechanical property such as the quiet rigidity of vehicle body.The advantage of the method is that design cost is lower, but due to the automotive body structure more complicated, and the body structure parameter of different automobile types is also different, so solid modelling length consuming time, in addition, owing to there being certain simplification in modeling process, make calculated rigidity and practical stiffness differ larger.
China Patent No. is that the patent documentation of CN1405545 discloses " car white vehicle body structure bending stiffness test constraint and charger ", be used for restraint device and the crooked charger of supporting testing body when relating to the test of body in white bending stiffness, but do not relate to the technology such as sag metering system, signals collecting and data processing.
China Patent No. is that the patent documentation of CN1405542 discloses " constraint of passenger vehicle body construction torsion rigidity test and charger " technology, be used for restraint device and the torsional rigidity charger of supporting testing body when comprising the test of body in white torsional rigidity, but do not relate to equally the technology such as windup-degree metering system, signals collecting and data processing.
China Patent No. is that the patent documentation of CN101281085 discloses " car white vehicle body structure static angular rigidity testing system and test method thereof ", comprise restraint device, servo bending stiffness charger, servo torsional rigidity charger, data acquisition system (DAS) etc., the quiet rigidity of vehicle body that has realized preferably general vehicle comprises the integration test of bending stiffness and torsional rigidity.In front seat assembly, front seat supports arm and front bearing panoramic table are connected by articulated structure and realize body in white the rotatablely moving of vertical guide, thereby complete the torsional rigidity test of body in white, and front bearing panoramic table is connected with the experiment table floor.But this structure Shortcomings, namely when carrying out system's bending stiffness test, owing to front seat assembly and experiment table floor can not being fixed, make after bending load loads, the needed bending of bending stiffness test not only can appear in body in white, still vehicle body can occur simultaneously and reverse, thereby bring very large error for the bending stiffness test result.Although this patent has also been mentioned test macro in addition, do not provide the composition of test macro.
In sum, present prior art or do not relate to building of rigidity testing system; Or do not relate to data acquisition and processing (DAP) in rigidity and crooked test process; Or the body stiffness test macro lacks the comprehensive test platform that comprises torsion, bending; Or there is measuring error in system because structure is not enough.
Summary of the invention
The objective of the invention is to propose for rationality, accuracy and the rapidity that improves the quiet rigidity test of passenger vehicle body the restraint device that needs in the quiet rigidity test process of a kind of body in white, the invention also proposes the detection method based on the quiet rigidity of body in white of this restraint device, body in white windup-degree and sag are realized fast and accurate the measurement.
the technical scheme that the quiet deflection constraint device of body in white of the present invention adopts is: be T-slot testing table floor under body in white, establish a front support bracket and about 2 rear support brackets of arranging on T-slot testing table floor, before, rear support bracket difference vertical support is before body in white, between rear section and T-slot testing table floor, one side of front support bracket is provided with pressure transducer and hydraulic jack, it is pressure transducer on hydraulic jack, body in white bottom surface surrounding is arranged some displacement transducers, the output terminal Bonding pressure transmitter of pressure transducer, the output terminal of displacement transducer all connects displacement transducer, displacement transducer is connected output terminal and is all connected successively A/D capture card and computer control unit with pressure unit, described front support bracket comprises side arm, T-shaped and I-shaped guide rail, the bottom of side arm vertically is fixedly connected with T-shaped groove testing table floor, the top of side arm is by the crossbeam middle of bolt, nut connecting T-shaped frame, and the crossbeam of T-shaped is arranged with respect to the body in white left and right and a side lower part position of crossbeam is hydraulic jack, the bottom of T-shaped is connected with the bottom of side arm by bearing pin, split pin, the beam surface upper left and right symmetrically of T-shaped respectively arranges an I-shaped guide rail, and I-shaped guide rail top slide connects stand, and stand top is provided with the first upper and lower flange, the front end tie point of clamping body in white between the second upper and lower flange, the bottom of described rear support bracket is after-frame, the bottom of after-frame and vertical being fastenedly connected in T-shaped groove testing table floor, the after-frame top is threaded connection the screw rod lower end, and the screw rod upper end is provided with the second upper and lower flange, two suspension point of clamping body in white rear end between the second upper and lower flange.
The detection method of the quiet rigidity of body in white of the present invention is:
RightTorsional rigidity and bending stiffness detect, the detection method of torsional rigidity is: A: pull out bearing pin, withstand on a side loaded of body in white with hydraulic jack, make T-shaped to rotate around bolt, drive body in white and twist around bolt with T-shaped, realize applying of torsional load; B: after the body in white twisting, the pressure transducer output voltage signal, by pressure unit, pressure signal is nursed one's health, obtain digital signal by data collecting card, and be converted to the loading force size in computer control unit, be converted to the torque value of actual imposed load apart from the spacing of reverse bearing point according to loading force; Simultaneously, the displacement transducer output voltage signal carries out signal condition by the displacement variator, obtains the displacement electric signal through the A/D capture card, and be converted into relative torsion angle between the automobile antero posterior axis in computer control unit; C, calculate torsional rigidity with the torque value of imposed load divided by windup-degree;
The detection method of bending stiffness is: first with bearing pin, that side arm and T-shaped is fixing, with the sandbag simulation passenger load-carrying of demarcating in advance, according to the actual size that how much obtains the power load that applies in the bending stiffness measuring process that loads sandbag; Then adopt the step B in the detection method of described torsional rigidity, measure the body distortion displacement of body in white after applying power load; Actual size with the load of applying sandbag namely draws bending stiffness divided by the body distortion displacement at last.
The present invention is based on the quiet rigidity of body test data test vehicle body, more rationally and accurately improved reliably the automotive body structure performance.Restraint device can not only be realized the clamping of body torsional rigdity and bending stiffness vehicle body in measuring process, and versatility is good, is applicable to different automobile types; Install, debug and measure easy, quick, accelerated the efficient to the different automobile types test, obviously reduced equipment cost under the prerequisite that guarantees measuring accuracy.
Description of drawings
Perspective view during the quiet rigidity test of Fig. 1 body in white;
Fig. 2 is the vertical view that Fig. 1 lays down body in white 31 rear rotations;
Fig. 3 is the right TV structure schematic diagram of Fig. 2;
Fig. 4 is the perspective view of front support bracket 29 in Fig. 1;
Fig. 5 is the front view of the front support bracket 29 of Fig. 4;
Fig. 6 is the perspective view of rear support bracket 32 in Fig. 1;
Fig. 7 is the enlarged drawing of the syndetons such as I-shaped guide rail 28 in Fig. 5, web member 17, flange;
Fig. 8 be in Fig. 3 A to the structure enlarged drawing;
Fig. 9 is that the quiet rigidity of body in white detects schematic diagram;
In figure: 1, T-shaped groove testing table floor; 2, briquetting; 3, cushion block; 4, T-shaped slot bolt; 5, T-shaped groove nut; 6, bearing pin; 7, side arm; 8, T-shaped; 9, bolt; 10, stand; 11, outer-hexagonal cylinder screw; 12, nut; 13, upper flange; 14, hexagon head bolt; 15, lower flange; 16, bearing pin; 17, web member; 18, split pin; 19, bearing pin; 20, nut; 21, split pin; 22, screw rod; 23, set nut; 24, after-frame; 25, split pin; 26, hydraulic jack; 27, pressure transducer; 28, I-shaped guide rail; 29, front support bracket; 30, displacement transducer; 31, body in white; 32, rear support bracket; 33, lower flange; 34 upper flanges; 35, displacement transducer; 36, A/D capture card; 37, computer control unit; 38, pressure unit; 39, interior hexagonal cylindrical screw.
As shown in Figure 1, the restraint device of the quiet stiffness measurement of body in white comprises the T-slot testing table floor 1 that is arranged under body in white 31, front support bracket 29 and rear support bracket 32 are installed on T-slot testing table floor 1, front support bracket 29 vertical support are between body in white 31 forward part and T-slot testing table floor 1, and rear support bracket 32 vertical support are between body in white 31 rear sections and T-slot testing table floor 1.A side at front support bracket 29 is equipped with the torsion charger, and this torsion charger is comprised of pressure transducer 27 and hydraulic jack 26, and pressure transducer 27 is arranged on hydraulic jack 26.Arranged some displacement transducers 30 in body in white 31 bottom surface surroundings, displacement transducer 30 is used for measuring the displacement of body in white 31 after imposed load, is arranged in the forward and backward longeron of body in white 31, on center tunnel, car door and vehicle window.
As Fig. 2, front support bracket 29 comprises side arm 7, T-shaped 8, I-shaped guide rail 28 etc., and the crossbeam of T-shaped 8 is arranged with respect to body in white 31 left and right.Rear support bracket 32 has 2, and the left and right arranges, is supported in respectively two trailing wheel installation sites of body in white 31.
As shown in Fig. 3,4,5, the bottom of side arm 7 is fixedly connected on T-shaped groove testing table floor 1 by T-shaped slot bolt 4 is vertical with T-shaped groove nut 5, and the top of side arm 7 is by the crossbeam middle of bolt 9, nut 20 connecting T-shaped framves 8.One side lower part position of the crossbeam of T-shaped 8 is hydraulic jack 26.When not reversing the loading test to T-shaped 8, the bottom of T-shaped 8 also is connected with the bottom of side arm 7 by bearing pin 6, split pin 21, when reversing the test loading, bearing pin 6 is pulled out, T-shaped 8 can be rotated rotation around bolt 9 in vertical plane at this moment, realizes the torsion of body in white 31.After being rotated in place for T-shaped 8, the crossbeam of T-shaped 8 is pressed on hydraulic jack 26, and T-shaped 8 amplitude of rotating depends on the height of hydraulic jack 26, and then realizes the torsional rigidity test.
As Fig. 7, beam surface upper at T-shaped 8, left and right symmetrically respectively arranges an I-shaped guide rail 28, each I-shaped guide rail 28 bottoms all are fixedly connected on the crossbeam of T-shaped 8 by outer-hexagonal cylinder screw 11, I-shaped guide rail 28 top slide connect stand 10, and stand 10 can be according to the situation of different automobile types physical dimension, and the left and right moves around on I-shaped guide rail 28, and by interior hexagonal cylindrical screw 39 location, realize the versatility of the quiet rigidity test of vehicle body.Stand 10 tops connect web member 17 by bearing pin 19, web member 17 is connected with lower flange 15 with split pin 18 by bearing pin 16 again, lower flange 15 connects upper flange 13, the front end tie point of clamping body in white 31 between upper flange 13 and lower flange 15, and be fixedly connected with nut 12 by hexagon head bolt 14, thereby realize the front end bearing of 29 pairs of body in whites 31 of restraint device front support bracket.
As shown in Fig. 3,6,8, the bottom of rear support bracket 32 is after-frames 24, the bottom of after-frame 24 is by cushion block 3 and briquetting 2 and T-shaped groove testing table floor 1 vertical being fastenedly connected, there is threaded hole on after-frame 24 tops, after-frame 24 tops are threaded connection mode connecting screw rod 22 lower ends, in order to prevent the up and down twisting of screw rod 22 in the rigidity test process, fixing with set nut 23 on after-frame 24 tops and screw rod 22 lower ends.Are connected with split pin and are connected with lower flange 33 by another bearing pin 19 in screw rod 22 upper ends, lower flange 33 is fixedly connected with upper flange 34, two suspension point of upper flange 34 and lower flange 33 clamping body in white 31 rear ends, the rear end bearing of realization to body in white 31.
As shown in Figure 9, with the output terminal Bonding pressure transmitter 38 of the pressure transducer 27 of the resistance-type on hydraulic jack 26, the output terminal of pressure unit 38 connects A/D capture card 36 and computer control unit 37 successively.The output terminal of some displacement transducers 30 that body in white 31 bottom surface surroundings are arranged all connects displacement transducer 35.The output terminal of displacement transducer 35 connects A/D capture card 36 and computer control unit 37 successively.Pressure transducer 27 is experienced top power and the output voltage signal of hydraulic jack 26, then carry out signal through pressure unit 38 and amplify and filtering, at last by A/D capture card 36, gather computing machine by computer control unit 37, and draw actual loading force, realize that the vehicle body loading force detects.When causing body in white 31 distortion due to hydraulic jack 26 loadings, or due to when the loading of demarcation sandbag causes body in white 31 crooked, the capital makes the microdeformation of body in white 31 car bodies, this distortion is detected by displacement transducer 30, then export corresponding displacement voltage signal, this voltage signal amplifies and filtering through displacement transducer 30, then through A/D capture card 36, collect computing machine and draw corresponding displacement by computer control unit 37, realize the body distortion displacement detecting.
The quiet rigidity that detects body in white 31 is namely to detect torsional rigidity and the bending stiffness of body in white 31.The torsional rigidity method that detects body in white 31 is as follows:
The first step: carry out Work condition analogue according to the constraint condition in the passenger car use procedure and load-up condition and load.As illustrated in fig. 1 and 2, detect in order to carry out fast torsional rigidity, at first the bearing pin 6 on front support bracket 29 is pulled out, making T-shaped 8 can be around hexagon head bolt 9 small angle rotation, rear support stand 32 is motionless, only plays support, then utilizes hydraulic jack 26 in arbitrary side loaded of body in white 31, be 26 pairs of T-shaped 8 imposed loads of hydraulic jack, realize the torsion of body in white 31.
Second step: after 26 pairs of T-shaped 8 imposed loads of lifting jack, T-shaped 8 is just rotated minute angle around bolt 9, drives body in white 31 along with T-shaped 8 bolt 9 twistings, has realized applying of torsional load.Along with the rotation of body in white 31, the faint and noisy voltage signal such as pressure transducer 27 outputs such as grade that contacts with its periphery, this signal is not suitable for the data acquisition of system, need to amplify and filtering it.Utilize 38 pairs of pressure signals that sent by pressure transducer 27 of pressure unit to nurse one's health according to the requirement of test, obtain to be directly proportional to pressure and satisfy the useful signal of A/D capture card 36 range abilities.Recycling A/D capture card 36 obtains digital signal, and is converted to the loading force size in computer control unit 37, then is converted to the torque value of actual imposed load apart from the spacing of reverse bearing point according to loading force.
The 3rd step: after body in white 31 side loaded, because the torsion of vehicle body makes the individual bits displacement sensor 30 of vehicle body surrounding be acted on, thereby export faint and noisy voltage signal when hydraulic jack 26.Utilize displacement transducer 35 to carry out signal condition, then obtain required digital displacement electric signal through A/D capture card 36, and be converted into relative torsion angle between the automobile antero posterior axis in computer control unit 37.
The 4th step: utilize the torque value of institute's imposed load to draw torsional rigidity divided by windup-degree.
The bending stiffness method that detects body in white 31 is as follows:
The first step: from the passenger, the load-carrying of body in white is loaded in the actual use procedure of simulating vehicle.In order to carry out the Quick Measurement of bending stiffness, in test, front support bracket 29 and rear support stand 32 are all motionless, realize the bending stiffness measurement by loading counterweight.At first utilize bearing pin 6 that side arm 7 is fixing with T-shaped 8, prevent that T-shaped 8 is rotated around bolt 9, brings disturbing influence thereby give in the bending stiffness test process; Then utilize the sandbag of demarcating in advance to simulate passenger's load-carrying, and the interior of body loading is carried out in its position of sitting according to the passenger.According to loading what of sandbag, obtain the actual size of the power load that applies in the bending stiffness measuring process.
Second step: measure the displacement of body in white 31 after applying power load, go on foot with the 3rd in torsional rigidity in its measuring process, being about to displacement transducer 30 output voltage signals sends into displacement transducer 35 and carries out signal condition, then utilize A/D capture card 36 to realize data acquisition, and obtain actual body distortion displacement in computer control unit 37.
The 4th step: utilize the actual size of the load of the sandbag that applies namely to draw bending stiffness divided by the body distortion displacement.