CN102435508A - White car body static stiffness restriction device and static stiffness detection method - Google Patents
White car body static stiffness restriction device and static stiffness detection method Download PDFInfo
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Abstract
The invention discloses a white car body static stiffness restriction device of a passenger car and a static stiffness detection method. The device is characterized in that: one side of a front bearing support is provided with a pressure transducer and a hydraulic jack, a plurality of displacement sensors are arranged at the periphery of the white car body bottom surface; the front bearing support comprises a front rack, a T-shaped rack, and a I-shaped guide rail, wherein, the end portion of the front rack is connected with the very center of a crossbeam of the T-shaped rack through bolts and nuts, the crossbeam of the T-shaped rack is arranged at the left and right side of the white car body, and the lower side of the crossbeam is provided with the hydraulic jack; the bottom of the T-shaped rack is connected with the bottom of the front rack through a pin roll and a split pin; the upper surface of the crossbeam of the T-shaped rack is symmetrically provided with I-shaped guide rails; a torque value of the applied load is divided by a twisting angle to calculate a twisting stiffness, and the actual value of the load is divided by a car body deformation displacement to obtain a bending stiffness. According to the invention, the efficiency of various vehicle tests is increased, and the device cost is obviously reduced on the premise that the test accuracy is guaranteed.
Description
Technical field
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, the torsional rigidity and the bending stiffness of vehicle body are tested fast.
Background technology
The full bearing structure of the most employings of passenger car vehicle body; The quiet rigidity of vehicle body generally comprises torsional rigidity and bending stiffness; Vehicle body is carrying almost that all reverse and bending load in the passenger car use; The quiet rigidity of vehicle body has a significant effect to comfort property, endurance quality and the dynamic response performance etc. of automobile, and therefore, the quiet rigidity of passenger car vehicle body is the matter of utmost importance that needs consideration in the body structure design process.The quiet rigidity property test of vehicle body at present mainly is to utilize softwares such as mature C AD, CAE; Through vehicle body is carried out d solid modeling; Utilize Finite Element Method analysis then; Observe body in white and the distortion of structural member under various different loads effects thereof, thereby obtain mechanical property such as the quiet rigidity of vehicle body.The advantage of this method is that design cost is lower, but because 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 in modeling process, there be certain simplification, make calculated rigidity and actual rigidity differ bigger.
Chinese patent number is that the patent documentation of CN1405545 discloses " car white vehicle body structure bending stiffness test constraint and charger "; Be used to support the restraint device and the crooked charger of testing body when relating to the test of body in white bending stiffness, but do not relate to technology such as sag metering system, signals collecting and data processing.
Chinese patent number is that the patent documentation of CN1405542 discloses " passenger car body structure torsional rigidity test constraint and charger " technology; Be used to support the restraint device and the torsional rigidity charger of testing body when comprising the test of body in white torsional rigidity, but do not relate to technology such as windup-degree metering system, signals collecting and data processing equally.
Chinese patent number 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 general vehicle preferably comprises the integration test of bending stiffness and torsional rigidity.In preceding seat assembly, preceding seat supports arm and preceding bearing panoramic table link to each other through articulated structure and realize body in white the rotatablely moving of vertical guide, thereby accomplish the torsional rigidity test of body in white, and preceding bearing panoramic table links to each other with the experiment table floor.But this structure exists not enough; Promptly when carrying out system's bending stiffness test; Owing to can not preceding seat assembly and experiment table floor be fixed, make that body in white bending stiffness not only can occur and test needed bending after bending load loads; Simultaneously vehicle body still can occur and reverse, thereby bring very mistake for the bending stiffness test result.Though 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 the crooked test process; Or the body stiffness test macro lack comprise reverse, crooked comprehensive test platform; Or there is measuring error in system owing to structure is not enough.
Summary of the invention
The objective of the invention is to propose the restraint device of needs in the quiet rigidity test process of a kind of body in white for rationality, accuracy and the rapidity that improves the quiet rigidity test of passenger car vehicle body; The present invention also proposes the detection method based on the quiet rigidity of body in white of this restraint device simultaneously, and body in white windup-degree and sag are realized fast and accurate the measurement.
The technical scheme that the quiet rigidity restraint device of body in white of the present invention adopts is: be T-slot testing table floor under the body in white; Establish a front support bracket and about 2 rear support brackets of arranging on the T-slot testing table floor; Forward and backward bearing support difference vertical support is between forward and backward part of body in white and T-slot testing table floor; One side of front support bracket is provided with pressure transducer and hydraulic jack; Be pressure transducer on the hydraulic jack, arrange some displacement transducers around the body in white bottom surface, the output terminal of pressure transducer connects pressure unit; The output terminal of displacement transducer all connects displacement transducer, and the output terminal of displacement transducer and pressure unit all is connected A/D capture card and computer control unit successively; Said front support bracket comprises side arm, T type frame and I-shaped guide rail; The bottom vertical fixing of side arm connects T type groove experiment table floor; The top of side arm connects the crossbeam middle of T type frame through bolt, nut, and the crossbeam of T type frame arranges about with respect to body in white and a side lower part position of crossbeam is a hydraulic jack; The bottom of T type frame links to each other with the bottom of side arm through bearing pin, split pin; The beam surface upper left and right symmetrically of T type frame respectively is provided with 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 said rear support bracket is an after-frame; The bottom of after-frame and vertical being fastenedly connected in T type groove experiment table floor; The after-frame top is through the screw rod lower end that is threaded, 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, T type frame is rotated around bolt; Drive body in white and twist around bolt, realize applying of torsional load with T type frame; B: after the body in white twisting; The pressure transducer output voltage signal; Through pressure unit pressure signal is nursed one's health; Obtain digital signal by data collecting card, and in computer control unit, convert the loading force size into, convert the torque value of actual imposed load according to loading force apart from the spacing of reverse bearing point into; Simultaneously, the displacement transducer output voltage signal carries out signal condition through the displacement variator, obtains the displacement electric signal through the A/D capture card, and in computer control unit, is converted into relative torsional angle degree between the automobile antero posterior axis; C, calculate torsional rigidity divided by windup-degree with the torque value of imposed load;
The detection method of bending stiffness is: with bearing pin side arm and T type frame are fixed earlier, 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; Adopt the step B in the detection method of said torsional rigidity then, measure the body distortion displacement of body in white after applying power load; Use the actual size of the load of the sandbag that applies promptly to draw bending stiffness at last divided by the body distortion displacement.
The present invention is based on the quiet rigidity of body test data test vehicle body, more rationally and accurately improved the automotive body structure performance reliably.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 efficient, under the prerequisite that guarantees measuring accuracy, obviously reduced equipment cost the different automobile types test.
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 back rotations;
Fig. 3 is the right TV structure synoptic diagram of Fig. 2;
Fig. 4 is the perspective view of front support bracket 29 among 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 among Fig. 1;
Fig. 7 is the enlarged drawing of syndetons such as I-shaped guide rail 28 among Fig. 5, web member 17, flange;
Fig. 8 be among Fig. 3 A to the structure enlarged drawing;
Fig. 9 is that the quiet rigidity of body in white detects schematic diagram;
Among the figure: 1, T type groove testing table floor; 2, briquetting; 3, cushion block; 4, T type slot bolt; 5, T type groove nut; 6, bearing pin; 7, side arm; 8, T type frame; 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 cylinder screw.
Embodiment
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 the 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.Be equipped with in a side of front support bracket 29 and reverse charger, this reverses charger is made up of pressure transducer 27 and hydraulic jack 26, and pressure transducer 27 is arranged on the hydraulic jack 26.Arranged some displacement transducers 30 around in body in white 31 bottom surfaces, displacement transducer 30 is used to measure the displacement of body in white 31 behind imposed load, is arranged in the forward and backward longeron of body in white 31, on center tunnel, car door and the vehicle window.
Like Fig. 2, front support bracket 29 comprises side arm 7, T type frame 8, I-shaped guide rail 28 etc., and the crossbeam of T type frame 8 is arranged with respect to body in white about 31.Rear support bracket 32 has 2, about arrange, be supported in two trailing wheel installation sites of body in white 31 respectively.
Like Fig. 3,4, shown in 5, the bottom of side arm 7 is connected on the T type groove experiment table floor 1 through T type slot bolt 4 and T type groove nut 5 vertical fixing, and the top of side arm 7 connects the crossbeam middle of T type frame 8 through bolt 9, nut 20.One side lower part position of the crossbeam of T type frame 8 is hydraulic jack 26.When T type frame 8 not being reversed the loading test; The bottom of T type frame 8 also links to each other with the bottom of side arm 7 through bearing pin 6, split pin 21, when reversing the test loading, then bearing pin 6 is pulled out; T type frame 8 can be rotated rotation around bolt 9 in vertical plane at this moment, realizes reversing of body in white 1.After 8 rotations of T type frame put in place, the crossbeam of T type frame 8 was pressed on the hydraulic jack 26, and the amplitude that T type frame 8 rotates depends on the height of hydraulic jack 26, and then realized the torsional rigidity test.
Like Fig. 7, in the beam surface upper of T type frame 8, left and right symmetrically respectively is provided with an I-shaped guide rail 28; Each I-shaped guide rail 28 bottom all is fixedly connected on the crossbeam of T type frame 8 through outer-hexagonal cylinder screw 11; I-shaped guide rail 28 top slide connect stand 10, and stand 10 can move around about on the I-shaped guide rail 28 according to the situation of different automobile types physical dimension; And, realize the versatility of the quiet rigidity test of vehicle body through interior hexagonal cylinder screw 39 location.Stand 10 tops connect web member 17 through bearing pin 19; Web member 17 links to each other with lower flange 15 with split pin 18 through 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 the lower flange 15, and be fixedly connected with nut 12 through hexagon head bolt 14, thereby the preceding end bearing of 29 pairs of body in whites 31 of realization restraint device front support bracket.
Like Fig. 3,6, shown in 8; The bottom of rear support bracket 32 is after-frames 24; The bottom of after-frame 24 is through cushion block 3 and briquetting 2 and T type groove experiment table floor 1 vertical being fastenedly connected, and there is threaded hole on after-frame 24 tops, and after-frame 24 tops are through thread connecting 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.Screw rod 22 upper ends are connected with lower flange 33 with split pin 25 through another bearing pin 19, and lower flange 33 is fixedly connected with upper flange 34, and two suspension point of upper flange 34 and lower flange 33 clamping body in whites 31 rear ends realize the back end bearing to body in white 31.
As shown in Figure 9, the output terminal of the pressure transducer 27 of the resistance-type on the hydraulic jack 26 is connected pressure unit 38, 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 of arranging around body in white 31 bottom surfaces is all connected 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 the top power and the output voltage signal of hydraulic jack 26; Carry out signal through pressure unit 38 then and amplify and filtering,, gather computing machine by computer control unit 37 at last through A/D capture card 36; And draw actual loading force, realize that the vehicle body loading force detects.When because hydraulic jack 26 loads when causing body in white 31 distortions, or owing to load when causing body in white 31 bendings, all can make the microdeformation of body in white 31 car bodies through demarcating sandbag; This distortion is detected by displacement transducer 30; Export corresponding displacement voltage signal then, this voltage signal amplifies and filtering through displacement transducer 30, again 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 promptly is to detect the torsional rigidity and the bending stiffness of body in white 31.The torsional rigidity method that detects body in white 31 is following:
The first step: carry out Work condition analogue according to constraint condition in the passenger car use and load-up condition and load.As illustrated in fig. 1 and 2, detect in order to carry out torsional rigidity fast, at first the bearing pin on the front support bracket 29 6 is pulled out; Make T type frame 8 to rotate around hexagon head bolt 9 low-angles; Rear support stand 32 is motionless, only plays support, utilizes the arbitrary side loaded of hydraulic jack 26 at body in white 31 then; Be 26 pairs of T types of hydraulic jack frame, 8 imposed loads, realize reversing of body in white 31.
Second step: behind 26 pairs of T types of lifting jack frame, 8 imposed loads, T type frame 8 just rotates minute angle around bolt 9, drives body in white 31 along with 9 twistings of T type frame 8 bolts, has realized applying of torsional load.Along with the rotation of body in white 31, the faint and noisy voltage signal such as output such as pressure transducer 27 grades that contacts with its periphery, this signal is not suitable for the data acquisition of system, need amplify and filtering it.Requirement according to test utilizes 38 pairs of pressure signals that sent by pressure transducer 27 of pressure unit to nurse one's health, and obtains to be directly proportional with pressure and satisfies the useful signal of A/D capture card 36 range abilities.Utilize data collecting card 36 to obtain digital signal again, and in computer control unit 37, convert the loading force size into, convert the torque value of actual imposed load then according to loading force apart from the spacing of reverse bearing point into.
The 3rd step: when hydraulic jack 26 after body in white 31 side loaded because the individual bits displacement sensor 30 that makes around the vehicle body that reverses of vehicle body acted on, thereby export faint and noisy voltage signal.Utilize displacement variator 35 to carry out signal condition, obtain required digital displacement electric signal through A/D capture card 36 then, and in computer control unit 37, be converted into relative torsional angle degree between the automobile antero posterior axis.
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 following:
The first step: from the passenger load-carrying of body in white is loaded in the actual use of simulating vehicle.In order to carry out the quick measurement of bending stiffness, in the test, front support bracket 29 is all motionless with rear support stand 32, realizes the bending stiffness measurement through loading counterweight.At first utilize bearing pin 6 that side arm 7 is fixing with T type frame 8, prevent that T type frame 8 from rotating around bolt 9, brings disturbing influence thereby give in the bending stiffness test process; Utilize the sandbag of demarcating in advance to simulate passenger's load-carrying then, and it is carried out the interior of body loading according to the position that the passenger sat.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 the 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; Utilize A/D capture card 36 to realize data acquisition then, and in computer control unit 37, obtain actual body distortion displacement.
The 4th step: utilize the actual size of the load of the sandbag that applies promptly to draw bending stiffness divided by the body distortion displacement.
Claims (2)
1. quiet rigidity restraint device of body in white; It under the body in white (31) T-slot testing table floor (1); Establish a front support bracket (29) and about 2 rear support brackets of arranging (32) on the T-slot testing table floor (1); Forward and backward bearing support (29,32) difference vertical support is between forward and backward part of body in white (31) and T-slot testing table floor (1); It is characterized in that: a side of front support bracket (29) is provided with pressure transducer (27) and hydraulic jack (26); Be pressure transducer (27) on the hydraulic jack (26), arrange some displacement transducers (30) around body in white (31) bottom surface, the output terminal of pressure transducer (27) connects pressure unit (38); The output terminal of displacement transducer (30) all connects displacement transducer (35), and the output terminal of displacement transducer (35) and pressure unit (38) all is connected A/D capture card (36) and computer control unit (37) successively; Said front support bracket (29) comprises side arm (7), T type frame (8) and I-shaped guide rail (28); The bottom vertical fixing of side arm (7) connects T type groove experiment table floor (1); The top of side arm (7) connects the crossbeam middle of T type frame (8) through bolt (9), nut (20), and the crossbeam of T type frame (8) arranges about with respect to body in white (31) and a side lower part position of crossbeam is hydraulic jack (26); The bottom of T type frame (8) links to each other with the bottom of side arm (7) through bearing pin (6), split pin (21); The beam surface upper left and right symmetrically of T type frame (8) respectively is provided with an I-shaped guide rail (28); I-shaped guide rail (28) top slide connects stand (10); Stand (10) top is provided with the first upper and lower flange (13,15), and clamping is the front end tie point of body in white (31) between the first upper and lower flange (13,15); The bottom of said rear support bracket (32) is after-frame (24); The bottom of after-frame (24) and vertical being fastenedly connected in T type groove experiment table floor (1); After-frame (24) top is through the screw rod that is threaded (22) lower end; Screw rod (22) upper end is provided with the second upper and lower flange (34,33), and clamping is two suspension point of body in white (31) rear end between the second upper and lower flange (34,33).
2. the method for detecting static rigidity of the said restraint device of claim 1 detects torsional rigidity and bending stiffness, it is characterized in that:
The detection method of torsional rigidity is:
A: pull out bearing pin (6),, make T type frame (8), drive body in white (31) and twist around bolt (9), realize applying of torsional load with T type frame (8) around bolt (9) rotation with the side loaded of hydraulic jack (26) at body in white (31);
B: after body in white (31) twisting; Pressure transducer (27) output voltage signal; Through pressure unit (38) pressure signal is nursed one's health; Obtain digital signal by data collecting card (36), and in computer control unit (37), convert the loading force size into, convert the torque value of actual imposed load according to loading force apart from the spacing of reverse bearing point into; Simultaneously; Displacement transducer (30) output voltage signal; Carry out signal condition through displacement variator (35), obtain the displacement electric signal through A/D capture card (36), and in computer control unit (37), be converted into relative torsional angle degree between the automobile antero posterior axis;
C, calculate torsional rigidity divided by windup-degree with the torque value of imposed load;
The detection method of bending stiffness is: with bearing pin (6) that side arm (7) and T type frame (8) is fixing earlier, 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; Employing is measured the body distortion displacement of body in white (31) after applying power load with the identical method of step B in the said torsional rigidity detection method then; Use the actual size of the load of the sandbag that applies promptly to draw bending stiffness at last divided by the body distortion displacement.
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| CN 201110270191 CN102435508B (en) | 2011-09-14 | 2011-09-14 | White car body static stiffness restriction device and static stiffness detection method |
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| CN103018024A (en) * | 2012-12-03 | 2013-04-03 | 奇瑞汽车股份有限公司 | Method for evaluating torsional rigidity |
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