CN103048146B - Multi-axle vehicle brake judder diagnostic device and multi-axle vehicle brake judder diagnostic method - Google Patents
Multi-axle vehicle brake judder diagnostic device and multi-axle vehicle brake judder diagnostic method Download PDFInfo
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- CN103048146B CN103048146B CN201210560511.XA CN201210560511A CN103048146B CN 103048146 B CN103048146 B CN 103048146B CN 201210560511 A CN201210560511 A CN 201210560511A CN 103048146 B CN103048146 B CN 103048146B
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Abstract
The invention discloses a multi-axle vehicle brake judder diagnostic device and a multi-axle vehicle brake judder diagnostic method, and relates to the field of engineering machinery. The multi-axle vehicle brake judder diagnostic device comprises a brake judder generation mechanism diagnostic device, a brake judder transfer path diagnostic device and detection result display equipment; the brake judder generation mechanism diagnostic device comprises a pressure detection element, a judder detection element and detection signal acquisition equipment; the brake judder transfer path diagnostic device comprises a diagnosis detection element and diagnostic signal acquisition equipment; and the diagnosis detection element is electrically connected with the diagnostic signal acquisition equipment through a line or a wireless signal transceiving device. The multi-axle vehicle brake judder diagnostic method is applied to a four-axle vehicle, and the multi-axle vehicle brake judder diagnostic device is applied. By the multi-axle vehicle brake judder diagnostic device and the multi-axle vehicle brake judder diagnostic method, the brake judder of the four-axle vehicle is diagnosed.
Description
Technical field
The present invention relates to engineering machinery field, be specifically related to a kind of multi-wheeled vehicle brake judder diagnostic device and use the multi-wheeled vehicle brake judder diagnostic method of this device.
Background technology
Brake judder refers to that the phenomenon causing steering wheel, brake pedal, underbody and seat acutely to shake when braking implemented by vehicle in certain vehicle speed range, and it brakes the one in the vibration that causes.According to the genesis mechanism of brake judder, brake judder can be divided three classes, and namely low-frequency jitter, intermediate frequency flutter and high frequency are uttered long and high-pitched sounds.
When brake judder generally occurs in high vehicle speeds and implements medium tenacity braking, it is an important fault of brake system, the control stability of vehicle is had a significant effect, have and increase the degree of fatigue of driver and the possibility of maloperation, therefore make fundamentally to control brake judder to the research of the brake judder origin cause of formation and become possibility, the basic reason that brake judder occurs is that braking moment and brake pressure, braking wheel speed there occurs fluctuation.
At present, most of four bridge automobile crane brake system adopt drum brake.Braking principle utilizes the friction between rotary part and on-rotatably moving part to brake, and rotary part is brake drum, and on-rotatably moving part is for braking neck hoof and braking are from hoof and friction disc.Brake judder generally occurs in high vehicle speeds, and the speed of a motor vehicle produces when 70km/h ~ 80km/h implements moderate braking, and performance characteristic is vehicle bridge, steering wheel shake.Brake judder brakes the one in the vibration that causes, and belong to the low-frequency vibration of vibration category, chattering frequency is less than 15Hz usually at below 100Hz.Brake judder generally occurs in after vehicle travels certain mileage, and it is that new car travels 5000-8000km and occurs that jitter phenomenon occurs according to statistics.The vibration source of brake judder is detent subsystem, steering wheel place is passed to after being amplified by the transmission of vehicle bridge, suspension, steering and individual subsystem transmission, during the braking of driver's underway equal strength, underbody is acutely shaken, the most obvious position be in pilothouse steering wheel towards the forward and backward swing in tangent to periphery direction.
Two bridge truck-mounted cranes, three bridge truck-mounted cranes, the mass distribution of four bridge truck-mounted cranes due to self and the needs of special lifting performance, generally adopt air-pressure brake, and it is obvious that air-pressure brake has braking effect, the features such as structural arrangement is easy.The gas circuit bang path of air-pressure brake is air compressor-instrument air dryer-four-loop protection valve body-each loop air drum-each loop pin relay valve (part air drum is directly connected with hand relay valve, exhaust brake cylinder, retarder brake cylinder)-each vehicle bridge brake chamber.Step on brake pedal when needs are braked and carry out service brake.
At least there is following technical matters in prior art:
In prior art, for the diagnostic method of automobile brake shake mainly based on the detection of brake pressure and braking moment, when there is brake judder there is fluctuation in brake pressure, and when there is not shake, brake pressure and moment are constant value, the fluctuation of variable quantity less and aperiodicity.For four bridge truck-mounted cranes run at high speed implement medium tenacity braking concrete diagnostic method and the domestic and international Patents of diagnostic device on also do not specialize in.Rationally cannot diagnose the mechanism of production of brake judder of four bridge truck-mounted cranes, the bang path of brake judder because prior art exists, and then clearly cannot know the reason of brake judder, finally cause the harm that cannot effectively reduce brake judder.
Summary of the invention
The object of the invention is the multi-wheeled vehicle brake judder diagnostic method proposing a kind of multi-wheeled vehicle brake judder diagnostic device and use this device, solve prior art and there is the technical matters cannot carrying out rationally diagnosis to the bang path of the mechanism of production of the brake judder of four bridge truck-mounted cranes, brake judder.
For achieving the above object, the invention provides following technical scheme:
The multi-wheeled vehicle brake judder diagnostic device that the embodiment of the present invention provides, comprises brake judder genesis mechanism diagnostic device, brake judder bang path diagnostic device and testing result display device, wherein:
Described brake judder genesis mechanism diagnostic device comprises pressure detecting element, shaking detection element and detection signal collecting device;
Described pressure detecting element, described shaking detection element are all electrically connected by circuit or by wireless signal transceiver with described detection signal collecting device separately;
Described pressure detecting element can detect in quadr--axle vehicle the pressure in the left air chamber shaken in bridge brake circuit, the pressure in right air chamber and the pressure of pin relay valve or the pressure of foot brake valves, and testing result is inputted described detection signal collecting device;
Described shaking detection element can detect the vibration acceleration shaking parts in described quadr--axle vehicle;
Described brake judder bang path diagnostic device comprises diagnosis detecting element and diagnostic signal collecting device;
Described diagnosis detecting element is electrically connected by circuit or by wireless signal transceiver with described diagnostic signal collecting device;
Described diagnosis detecting element can detect the deflection or the vibration acceleration that are in the structural member on vibration force bang path in the brake circuit braking procedure in described quadr--axle vehicle, and testing result is inputted described diagnostic signal collecting device;
Described testing result display device is electrically connected by circuit or by wireless signal transceiver with described detection signal collecting device, described diagnostic signal collecting device;
Input described testing result display device after its testing result obtained separately can be treated to numerical value by described detection signal collecting device and described diagnostic signal collecting device and shown by described testing result display device.
In an optional or preferred embodiment, described pressure detecting element is pressure transducer, and it to comprise after left air chamber pressure sensor, right air chamber pressure sensor, pin relay valve pressure transducer after pressure transducer and foot brake valves, wherein:
Described left air chamber pressure sensor setting is in the gas feeding duct of described left air chamber or the gas outlet duct of described left air chamber;
Described right air chamber pressure sensor setting is in the gas feeding duct of described right air chamber or in the gas outlet duct of described right air chamber;
After described pin relay valve, pressure transducer is arranged in described pin relay valve gas outlet duct;
After described foot brake valves, pressure transducer is arranged in the gas outlet duct of described foot brake valves.
In an optional or preferred embodiment, described brake judder bang path diagnostic device comprise detent place diagnostic device, steeraxle place vibration diagnosis device, steering system place vibration diagnosis device and steering wheel place vibratory response diagnostic device at least one of them, wherein:
Described detent place diagnostic device comprises at least two described diagnosis detecting elements, the braking neck hoof of external margin and described detent that at least two described diagnosis detecting elements are arranged at the detent in described quadr--axle vehicle is respectively with braking from hoof, and the described diagnosis detecting element in described detent place diagnostic device can detect the pulling force distortion of the described detent outside surface of braking moment, pressure distortion and described braking neck hoof, described from the vibration acceleration of hoof braking procedure;
Described steeraxle place vibration diagnosis device comprises at least five described diagnosis detecting elements, at least five described diagnosis detecting elements are arranged on track rod, knuckle arm and the steeraxle in described quadr--axle vehicle respectively, and the described diagnosis detecting element in described steeraxle place vibration diagnosis device can detect the acceleration of the acceleration of the axial vibration of described track rod, described knuckle arm tangential vibrations, described steeraxle centre position and the described steeraxle left and right sides respectively vertical, laterally and the acceleration that longitudinal direction vibrates;
Described steering system place vibration diagnosis device comprises the described diagnosis detecting element on described diagnosis detecting element at least one steering drag link being arranged in described quadr--axle vehicle and tie rod ball that at least one is arranged in described quadr--axle vehicle, and it can detect the acceleration of described steering drag link axial vibration and the acceleration of described tie rod ball tangential vibrations;
Described steering wheel place vibratory response diagnostic device comprises the described diagnosis detecting element at least one steering wheel being arranged in described quadr--axle vehicle, and it can detect described steering wheel respectively vertical, laterally and the acceleration that longitudinal direction vibrates.
In an optional or preferred embodiment, described diagnosis detecting element is sensor, and the described diagnosis detecting element in described detent place diagnostic device comprises resistance strain type sensor and acceleration transducer.
In an optional or preferred embodiment, the described diagnosis detecting element be arranged on described knuckle arm is positioned at described knuckle arm upper surface, and the described diagnosis detecting element being arranged at described steeraxle centre position is positioned at described steeraxle upper surface middle;
The bottom surface axis being arranged at the described diagnosis detecting element on described steering drag link coincides with the axial line of described steering drag link or parallels;
The number being arranged at the described diagnosis detecting element on described steering wheel is at least two, and the described diagnosis detecting element be arranged on described steering wheel is symmetricly set on described steering wheel.
In an optional or preferred embodiment, the described diagnosis detecting element in described shaking detection element and described steering wheel place vibratory response diagnostic device is identity element.
In an optional or preferred embodiment, described detection signal collecting device and described diagnostic signal collecting device are same chip, or described detection signal collecting device and described diagnostic signal collecting device are two different chips.
The multi-wheeled vehicle brake judder diagnostic method that the embodiment of the present invention provides, at least comprises the following steps:
The multi-wheeled vehicle brake judder diagnostic device that the arbitrary technical scheme of the embodiment of the present invention provides is installed in quadr--axle vehicle;
Carry out brake pressure shake bridge and non-shake bridge contrast verification, draw the cycle of fluctuation of brake pressure during shake, and when judging not shake, whether pressure there is fluctuation;
Draw the chattering frequency of shake parts.
According to the vibration frequency calculating brake pressure cycle of fluctuation of the brake pressure that joggling test draws.
Judge whether the vibration frequency of brake pressure coincide in time domain with the chattering frequency of shake parts.
In an optional or preferred embodiment, this multi-wheeled vehicle brake judder diagnostic method is further comprising the steps of:
Carry out detent stress deformation bench test, and carry out braking excitation diagnosis according to test findings;
The brake judder bang path diagnostic device of described multi-wheeled vehicle brake judder diagnostic device is accessed in the non-shake bridge in a described quadr--axle vehicle brake circuit, carry out reduced parameter test, at least determine the scope of the vibration frequency under the non-jitter conditions of each bang path, vibration acceleration;
Be that vehicle at the uniform velocity travels in the operating mode of described quadr--axle vehicle, when speed reaches predetermined speed per hour, keep foot brake valves to be in scheduled pressure value, carry out medium tenacity braking;
According to the testing result of described multi-wheeled vehicle brake judder diagnostic device display, find each direction of transfer and the path of brake judder, and determine the main bang path of vibration;
Transmission weakening element is also removed by the main bang path of result optimizing tested according to shake bridge, non-shake bridge reduced parameter in main bang path;
Analyze chattering frequency, vibration acceleration, carry out bang path vector quantization;
The vibration radiation point of bang path is determined according to resonance theory and Fourier's change;
Improve vibration source and vibration radiation point place's natural frequency and quality according to bang path, the natural frequency of structural member and excited frequency are avoided.
In an optional or preferred embodiment, described quadr--axle vehicle is four bridge truck-mounted cranes.
In an optional or preferred embodiment, described shake parts are steering wheel; Described predetermined speed per hour is 70km/h; Described scheduled pressure value is 2bar ~ 2.5bar;
The length dimension of the steering drag link in described quadr--axle vehicle is 650mm ~ 750mm, and the single order natural mode of vibration frequency of described steering drag link is 150Hz ~ 200Hz;
The gauge of the steering gear fixed head in described quadr--axle vehicle is at least 5mm ~ 10mm, and is welded with reinforcement between the vehicle frame of described steering gear fixed head and described quadr--axle vehicle;
The monolateral jerk value of the brake drum in described quadr--axle vehicle is not more than 0.4mm, and total jerk value is not more than 0.6mm.
Based on technique scheme, the embodiment of the present invention at least can produce following technique effect:
Due to the multi-wheeled vehicle brake judder diagnostic device using the embodiment of the present invention to provide, multi-wheeled vehicle brake judder diagnostic method can determine a quadr--axle vehicle vibration source of (such as: four bridge truck-mounted cranes) and the vibration transfer path of more than 90%, so staff can be made clearly to know the reason of brake judder, and then take many measures to effectively reduce the harm of brake judder, engineering truck is waited thus for solving quadr--axle vehicle, crane brake jitter problem provides new method, new approaches, cannot to the mechanism of production of the brake judder of four bridge truck-mounted cranes so solve prior art existence, the bang path of brake judder carries out the technical matters of rationally diagnosis.
In addition, compared with prior art, the optimal technical scheme that the embodiment of the present invention provides also at least can produce following technique effect:
1, the present invention is according to the surface of shake, devises brake judder genesis mechanism diagnostic device and method; According to the direction of propagation of shake, devise brake judder bang path diagnostic device and method.Finally propose the effective measures reducing brake judder.The present invention is to provide a whole set of theory and means from fault diagnosis to issue handling.
2, the present invention vibrates the proposition of genesis mechanism diagnostic device and method, locks vibration source.
3, bang path diagnostic method provided by the invention is the effective means determined a quadr--axle vehicle main bang path and transmit direction vector.
4, the present invention can carry out comprehensive diagnos to the genesis mechanism of brake judder, bang path.
5, the present invention proposes vibration source, vibration transfer path, vibration radiation point, vibration improved procedure effective ways.
In sum, the present invention, according to the surface of shake, devises brake judder genesis mechanism diagnostic device and method; According to the direction of propagation of shake, devise brake judder bang path diagnostic device and method.Finally propose the effective measures reducing brake judder.The present invention is to provide a whole set of theory and means from fault diagnosis to issue handling.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
The structural principle schematic diagram in four bridge truck-mounted crane inside brake loops of the multi-wheeled vehicle brake judder diagnostic device that Fig. 1 provides for the application embodiment of the present invention;
The principle schematic in the path of four bridge truck-mounted crane internal vibrations transmission of the multi-wheeled vehicle brake judder diagnostic device diagnosis that Fig. 2 provides for the embodiment of the present invention;
The schematic perspective view of the annexation of the disc brake in the multi-wheeled vehicle brake judder diagnostic device that Fig. 3 provides for the embodiment of the present invention and four bridge truck-mounted cranes;
Fig. 4 is the floor map of the partial structurtes of the disc brake in the four bridge truck-mounted cranes that are connected with the multi-wheeled vehicle brake judder diagnostic device that the embodiment of the present invention provides;
Fig. 5 is the cross-sectional schematic along A-A line in Fig. 4;
A schematic diagram of the annexation of steeraxle place structure in the multi-wheeled vehicle brake judder diagnostic device that Fig. 6 provides for the embodiment of the present invention and four bridge truck-mounted cranes;
Another schematic diagram of the annexation of steeraxle place structure in the multi-wheeled vehicle brake judder diagnostic device that Fig. 7 provides for the embodiment of the present invention and four bridge truck-mounted cranes;
A schematic diagram of the annexation of steering system place structure in the multi-wheeled vehicle brake judder diagnostic device that Fig. 8 provides for the embodiment of the present invention and four bridge truck-mounted cranes;
Another schematic diagram of the annexation of steering system place structure in the multi-wheeled vehicle brake judder diagnostic device that Fig. 9 provides for the embodiment of the present invention and four bridge truck-mounted cranes;
Figure 10 is a schematic diagram of steering wheel in the four bridge truck-mounted cranes of multi-wheeled vehicle brake judder diagnostic device that arrange the embodiment of the present invention and provide;
A schematic diagram of the annexation of steering wheel in the multi-wheeled vehicle brake judder diagnostic device that Figure 11 provides for the embodiment of the present invention and four bridge truck-mounted cranes;
The schematic diagram of annexation between the multi-wheeled vehicle brake judder diagnostic device internal portions that Figure 12 provides for the embodiment of the present invention;
Mark in figure: 1, right air chamber pressure sensor; 2, air compressor; 3, instrument air dryer; 4, gas return path protective valve; 5, air tank; 6, the foot brake loop of two bridges, three bridges and four bridges and hand braking loop; 7, pin relay valve pressure transducer; 8, left air chamber pressure sensor; 9, pressure transducer 101, bridge foot brake valves after foot brake valves; 102, two bridge foot brake valves; 11, hand brake valve; 12, braking neck hoof; 13, brake assembly; 14, brake from hoof; 15, one-sided friction disc; 16, detent outward flange strain transducer; 17, brake-shoe acceleration transducer; 18, roller; 19, limiting plate; 20, backing pin; 21, set bolt; 22, spring return function pin; 23, dust plug; 24, retracing spring; 25, brake drum; 26, left hand brake air chamber; 27, track rod and knuckle arm connecting ball head; 28, track rod place axial vibration sensor; 29, right side brake chamber; 30, right hand steering joint arm tangential vibrations sensor; 31, vibration transducer on the left of steeraxle; 32, suspension fixed position; 33, vibration reference sensor in the middle of steeraxle; 34, vibration transducer on the right side of steeraxle; 35, brake camshaft; 36, tight a bolt; 37, steering wheel; 38, steering gear; 39, vehicle frame bottom surface; 40, steeraxle axis; 41, tire centerline; 42, pitman arm; 43, steering gear fixed head; 44, tie rod ball; 45, steering drag link; 46, steering axle; 47, vertical column fixing device is turned to; 48, steering axle universal joint; 49, steering wheel left sensor; 50, steering wheel right sensor; 51, steering drag link axial acceleration sensor; 52, cab floor.
Embodiment
Below by accompanying drawing Fig. 1 ~ Figure 12 and the mode enumerating embodiment more of the present invention, technical scheme of the present invention (comprising optimal technical scheme) is described in further detail.It should be noted that: any technical characteristic in the present embodiment (can use comma between technical characteristic, fullstop, pause mark or branch etc. arbitrarily punctuation mark separate), any technical scheme is all one or more in the technical characteristic of plurality of optional or optional technical scheme, cannot exhaustive all alternative technical characteristics of the present invention and alternative technical scheme in order to describe succinct to need in presents, also the embodiment being not easy to each technical characteristic all emphasizes that it is one of optional numerous embodiments, so those skilled in the art should know: any technical characteristic in the present embodiment and any technical scheme all do not limit the scope of the invention, protection scope of the present invention should comprise those skilled in the art and not pay the thinkable any alternate embodiments of creative work.
Embodiments provide and a kind ofly can carry out the multi-wheeled vehicle brake judder diagnostic device of rationally diagnosis to the braking excitation of truck-mounted crane, brake judder vibration source and use the multi-wheeled vehicle brake judder diagnostic method of this device.
Below in conjunction with the elaboration that Fig. 1 ~ Figure 12 carries out specifically to technical scheme provided by the invention, the technical scheme of arbitrary technological means provided by the invention being carried out replacing or two or more technological means provided by the invention being carried out mutually combining and obtain all should within protection scope of the present invention.
As shown in Fig. 1 ~ Figure 12, the multi-wheeled vehicle brake judder diagnostic device that the embodiment of the present invention provides comprises brake judder genesis mechanism diagnostic device, brake judder bang path diagnostic device and testing result display device, wherein: the many bridges mentioned by the present invention comprise four bridges, five bridges and even more bridges, multi-wheeled vehicle refers to the vehicle arranging four bridges, five bridges and even more bridge brake circuits.
Brake judder genesis mechanism diagnostic device comprises pressure detecting element, shaking detection element and detection signal collecting device.
Pressure detecting element, shaking detection element are all electrically connected by circuit or by wireless signal transceiver with detection signal collecting device separately.
Pressure detecting element can detect in quadr--axle vehicle the pressure in the left air chamber shaken in bridge brake circuit, the pressure in right air chamber and the pressure of pin relay valve or the pressure of foot brake valves, and testing result is inputted detection signal collecting device.
Shaking detection element can detect the vibration acceleration shaking parts (these shake parts are preferably in braking procedure and shake obvious steering wheel) in quadr--axle vehicle.
Brake judder bang path diagnostic device comprises diagnosis detecting element and diagnostic signal collecting device.
Diagnosis detecting element is electrically connected by circuit or by wireless signal transceiver with diagnostic signal collecting device.
Diagnosis detecting element can detect the deflection or the vibration acceleration that are in the structural member on vibration force bang path (this bang path comprises main bang path and auxiliary bang path) in the brake circuit braking procedure in quadr--axle vehicle, and testing result is inputted diagnostic signal collecting device.
Testing result display device is electrically connected by circuit or by wireless signal transceiver with detection signal collecting device, diagnostic signal collecting device.
Input testing result display device after its testing result obtained separately can be treated to numerical value by detection signal collecting device and diagnostic signal collecting device and shown by testing result display device.The mode of the display testing result of testing result display device can be the forms such as display character, chart or animation.
The detecting element mentioned herein is preferably and adopts sensor to realize, and certainly, uses other elements with measuring ability with the technical scheme of alternative sensor also within protection scope of the present invention.Detecting element also can be called measuring point herein.
The multi-wheeled vehicle brake judder diagnostic device using the embodiment of the present invention to provide can determine a quadr--axle vehicle vibration source of (such as: four bridge truck-mounted cranes) and the vibration transfer path of more than 90%, so staff can be made clearly to know the reason of brake judder, and then many measures are taked to effectively reduce the harm of brake judder.
Preferred or the optional embodiment as one, pressure detecting element is preferably pressure transducer, and it to comprise after left air chamber pressure sensor 8, right air chamber pressure sensor 1, pin relay valve pressure transducer 9 after pressure transducer 7 and foot brake valves, wherein:
Because shake bridge is a bridge and the steeraxle of three bridge vehicle cranes, thus left air chamber pressure sensor 8 also can be called a bridge left air chamber pressure sensor, right air chamber pressure sensor 1 also can be called the right air chamber pressure sensor of a bridge, pin relay valve after pressure transducer 7 also can be called a bridge pin relay valve after pressure transducer, pressure transducer 9 also can be called pressure transducer after a bridge foot brake valves after foot brake valves.
Left air chamber pressure sensor 8 is arranged in the gas feeding duct of left air chamber or the gas outlet duct of left air chamber.Left air chamber pressure sensor 8 is for detecting the pressure of left air chamber internal gas pressure in real time.
In the gas feeding duct that right air chamber pressure sensor 1 is arranged at right air chamber or in the gas outlet duct of right air chamber.Right air chamber pressure sensor 1 is for detecting the pressure of right air chamber internal gas pressure in real time.
After pin relay valve, pressure transducer 7 is arranged in pin relay valve gas outlet duct.After pin relay valve, pressure transducer 7 is for detecting pin relay valve brake pressure in real time, and the pressure of this pin relay valve is also referred to as the top hole pressure of pin relay valve.
After foot brake valves, pressure transducer 9 is arranged in the gas outlet duct of foot brake valves.After foot brake valves, pressure transducer 9 is for detecting the pressure of foot brake valves brake pressure in real time, and the brake pressure of this foot brake valves is also referred to as the top hole pressure of foot brake valves.
The location of pressure transducer is preferably by the three-way connection of 12L, during concrete installation, pressure transducer is connected with pneumatic circuit, two ports of three-way connection connect pneumatic circuit (pneumatic circuit is the above-mentioned gas feeding duct mentioned or gas outlet duct) respectively herein, remaining port draws pressure line, and pressure line is connected with detection signal collecting device and carries out signals collecting.
During due to the brake circuit braking of shake bridge, the brake pressure (top hole pressure) of pin relay valve and foot brake valves brake pressure relatively, and pressure transducer 7 is arranged than being easier to after pin relay valve, so the force value that can be detected by pressure transducer 7 after detection pin relay valve is used as the approximate value of the brake pressure of foot brake valves.
Mainly contain three brake circuits in Fig. 1: 21 loops, 22 loops and 23 loops, be responsible for the braking maneuver realizing a bridge, two bridges, three bridges and four bridges respectively.21 loops are four bridge truck-mounted crane braking major loops, and the concrete braking procedure in 21 loops is:
Dry through instrument air dryer after gas is compressed by air compressor, enter air tank 21 by four-loop protection valve.The outlet of air tank 21 has two branch roads, and one leads to pin relay valve, and another leads to foot brake valves.When brake pedal does not depress, foot brake valves and pin relay valve are all in non-opening, and gas can not enter the left air chamber of a bridge brake circuit, right air chamber, and brake system is in off position; When brake pedal depresses, first foot brake valves connects gas circuit, and gas is in opening by making pin relay valve after foot brake valves, and connect the gas circuit connection of the left air chamber of a bridge, right air chamber, brake system is in running order.
The design key of brake judder genesis mechanism diagnostic device is: the pressure loss diagnosing out the air chamber pressure of shake bridge (bridge) to fluctuate, shake between the distribution otherness of the left and right brake pressure of bridge, foot brake valves to brake chamber in brake judder rapidly, can diagnose according to above device.If there is shake in braking procedure, then brake gas circuit and can detect that the distribution of brake pressure and damping force there will be fluctuation by after air compressor machine-instrument air dryer-loop, air drum-21, loop, four-loop protection valve-21 foot brake valves (21 loop pin relay valves act on) the left and right brake chamber of-mono-bridge simultaneously.Cycle of fluctuation according to brake pressure can determine vibration frequency, can determine to shake driving source by this diagnostic device.
When brake judder appears in brake system, after left air chamber pressure sensor 8, right air chamber pressure sensor 1, pin relay valve, after pressure transducer 7 and foot brake valves, these four sensors of pressure transducer 9 export the foot brake valves outlet pressure pulsations in the pressure surge of the left air chamber of a bridge, the pressure surge of the right air chamber of a bridge, the pressure surge of pin relay valve and 21 loops respectively.As shown in Figure 1, the pressure transducer main cause be arranged in a bridge brake circuit is a bridge is shake bridge, is produce the most obvious parts of shake in braking procedure in the concrete installation site of pressure transducer.
According to above-mentioned diagnostic device, checkout and diagnosis can be carried out to the pressure surge of the left air chamber of a bridge, right air chamber, pin relay valve and foot brake valves in real time in braking procedure.
Bang path based on vibration is theoretical: if the vibration of system is by m exciting force effect, each exciting force has x, y, z three direction vectors, the corresponding n of each exciting force vector specific bang path, certain bang path that so this exciting force vector is corresponding just produces the response of a system.Its formula can represent Ot (fx)=H (fx) × F(w), wherein, H (fx) is transport function, F(w) be the frequency spectrum of exciting force.From driving source to system, there is corresponding bang path as shown in Figure 2 in concrete, system incentive source and be actually input as in(fx), A (fx) is system error originated from input.After transfer function H (fx), export response ot (fx), B (fx) is for exporting measuring error.The vibration stimulus source of brake judder, a main bang path and vibratory response can be determined according to the theory of bang path.Can be optimized and improvement transmission system after determining main bang path, thus resolution system jitter problem.The problem that brake judder bang path diagnostic device of the present invention solves finds out the exciting force of system (vibration source), vibration radiation point and main bang path.A kind of error that systematic error A (fx) refers to adjoint system driving source and incidentally produces, is called as noise signal in the angle of signal, general by isolating the noise component of driving source, system errors as far as possible.Systematic error can be measured by noise isolation source.
Optional or preferred embodiment as one, brake judder bang path diagnostic device comprise detent place diagnostic device, steeraxle place vibration diagnosis device, steering system place vibration diagnosis device and steering wheel place vibratory response diagnostic device at least one of them, be preferably detent place diagnostic device, steeraxle place vibration diagnosis device, steering system place vibration diagnosis device and steering wheel place vibratory response diagnostic device brake judder bang path provided by the invention diagnostic device to include, wherein:
Detent place diagnostic device comprises at least two diagnosis detecting elements, and the diagnosis detecting element in detent place diagnostic device preferably comprises resistance strain type sensor as shown in Figure 4 and detent outward flange strain transducer 16 and acceleration transducer and brake-shoe acceleration transducer 17.The braking neck hoof 12 of external margin and detent that in detent place diagnostic device at least two diagnosis detecting elements are arranged at the detent in quadr--axle vehicle respectively with braking from hoof 14, and the diagnosis detecting element in detent place diagnostic device can detect the pulling force distortion of detent outside surface, (pulling force is out of shape pressure distortion, pressure distortion is abbreviated as and draws, compressive strain, draw, the detection of compressive strain can be realized by the such as strain transducer of detent outward flange shown in 4 figure 16) and braking neck hoof 12 and braking from the vibration acceleration of hoof 14 braking procedure (detection of vibration acceleration can be realized by such as brake-shoe acceleration transducer 17 shown in 4 figure).
Detent outward flange strain transducer 16 is preferably arranged on detent outside surface metal level, metal level carried out grinding process and carries out wiping with acetone soln, finally pasting the resistance strain gage of detent outward flange strain transducer 16 at external margin near the position of brake-shoe; Brake-shoe acceleration transducer 17 is vibration transducers, and it is fixed near the sheet metal of braking neck hoof 12, near friction disc edge with magnetic support.Brake-shoe acceleration transducer 17 can find out the frictional vibration driving source in braking procedure between brake-shoe and brake drum.
Four bridge automobile crane brake system adopt conventional drum brake.The structure of detent, as shown in Fig. 3, Fig. 4 and Fig. 5, mainly comprises braking neck hoof 12, brakes retracing spring 24, wheel cylinder, friction disc etc. from hoof 14, brake-shoe 12.Braking is by braking neck hoof 12, brakes and produce from rubbing between the friction disc and brake drum of hoof 14.Therefore brake judder can embody to some extent on brake-shoe.This device adopts the drawing of the detent outside surface of detent external margin local stress test braking moment, compressive strain.Adopt vibration acceleration sensor to braking neck hoof 12, brake and diagnose from the cycle of fluctuation of hoof 14 braking procedure and frequency.This diagnostic device is mainly used in bench test.Hoof is led in braking, the acceleration transducer that shakes from hoof should be arranged near friction disc side, and the strain of detent outward flange adopts full-bridge road resistance strain gage, and position extends about 50mm laterally apart from friction disc and brake drum contact position.
Steeraxle place vibration diagnosis device comprises at least five diagnosis detecting elements, preferably comprises on the left of track rod place axial vibration sensor 28, right hand steering joint arm tangential vibrations sensor 30, steeraxle and vibrates vibration transducer 34 on the right side of reference sensor 33 and steeraxle in the middle of vibration transducer 31, steeraxle.In steeraxle place vibration diagnosis device at least five diagnosis detecting elements are arranged on track rod, knuckle arm and the steeraxle in quadr--axle vehicle respectively, and the diagnosis detecting element in steeraxle place vibration diagnosis device can detect the acceleration that the acceleration of the acceleration of the axial vibration of track rod, knuckle arm tangential vibrations, steeraxle centre position and the steeraxle left and right sides vibrate respectively in vertical, transverse direction and longitudinal direction.
Detent place brake shake first by vibration passing to vehicle bridge, be passed to steering, suspension system by vehicle bridge again, therefore vehicle bridge be transmit detent shake predominating path.The preferred arrangement of sensor is as follows:
1, track rod place arranges two acceleration transducers i.e. two track rod place axial vibration sensors 28, respectively near arranged on left and right sides knuckle arm 50mm.The center of sensor is through track rod axis, and fixing reliable non-loosening, acceleration transducer base has more ferromagnetic magnetic support, and equal non-loosening after general placement, measurement direction is axially consistent with drag link.
2, knuckle arm place arranges an acceleration transducer and right hand steering joint arm tangential vibrations sensor 30, optional one of left joint arm, right joint arm, position is positioned at knuckle arm upper surface, apart from brake position 40mm measurement direction be knuckle arm movement locus tangential direction.
3, in the middle of steeraxle, vibration reference sensor and steeraxle middle vibration reference sensor 33 are arranged in steeraxle upper surface middle, and measurement direction is Three Degree Of Freedom (vertical, transverse direction, longitudinal direction).
4, vibration transducer 34 on the right side of vibration transducer 31 and steeraxle on the left of steeraxle arranged on left and right sides vibration transducer and steeraxle, as far as possible near vehicle bridge both sides steering knuckle, distance steering knuckle about 20mm, on the left of steeraxle, vibration transducer 31 is preferably consistent with vibration transducer on the right side of steeraxle 34 position.Measurement direction is vertical, transverse direction, longitudinal direction.
Steering system place vibration diagnosis device comprises diagnosis detecting element at least one steering drag link being arranged in quadr--axle vehicle and steering drag link axial acceleration sensor 51 and at least one and is arranged at diagnosis detecting element on tie rod ball, preferably comprise steering drag link axial acceleration sensor 51 and pitman arm tangential acceleration transducer, and steering system place vibration diagnosis device its can detect the acceleration (this acceleration is also the tangential acceleration of pitman arm simultaneously) of the acceleration (detection of the acceleration of this vibration realizes preferably by steering drag link axial acceleration sensor 51) of steering drag link axial vibration and tie rod ball tangential vibrations.
Fig. 8 chain lines represents the position of cab floor.
There is steering drag link axial acceleration sensor 51 vibration position of layouting, and this sensor is arranged in distance pitman arm 100mm place, sensor bottom surface axis and Drag link dead in line, and measurement direction is steering drag link axis.Pitman arm tangential acceleration, sensor cloth is setting in Drag link bulb position 30mm, and measurement direction is the tangential direction of pitman arm movement locus.
Vibratory response diagnostic device in steering wheel place comprises the diagnosis detecting element at least one steering wheel being arranged in quadr--axle vehicle, preferably comprises steering wheel left sensor 49 and steering wheel right sensor 50; And steering wheel place vibratory response diagnostic device its can detect steering wheel respectively vertical, laterally and the acceleration that longitudinal direction vibrates.
Steering wheel place is the response component of vibration, the form of expression according to shake need point stressed location arrangements three-axis acceleration sensor and steering wheel left sensor 49 and steering wheel right sensor 50 driver, can measure tangent line, normal direction, the vertical acceleration of steering wheel during shake simultaneously.Bogie arrangement primarily of turning to column, turn to vertical column fixing device, the parts such as steering axle 46, steering axle universal joint 48 form.Steering wheel left sensor 49 and the left and right symmetry of steering wheel right sensor 50 are installed, and sensor lower plane normal direction is perpendicular to steering wheel faying face.Positional distance driver hand griping position about 40mm.
Optional or preferred embodiment as one, be arranged at diagnosis detecting element on knuckle arm and right hand steering joint arm tangential vibrations sensor 30 is positioned at knuckle arm upper surface, in the middle of being arranged at the diagnosis detecting element in steeraxle centre position and steeraxle, vibration reference sensor 33 is positioned at steeraxle upper surface middle.
The bottom surface axis being arranged at diagnosis detecting element on steering drag link and steering drag link axial acceleration sensor 51 coincides with the axial line of steering drag link or parallels.
Be arranged at diagnosis detecting element on steering wheel and steering wheel left sensor 49 is at least two with the number of steering wheel right sensor 50, and the diagnosis detecting element be arranged on steering wheel is symmetricly set on steering wheel.
Optional or preferred embodiment as one, the diagnosis detecting element in shaking detection element and steering wheel place vibratory response diagnostic device and steering wheel left sensor 49 and steering wheel right sensor 50 are identity element.Now can utilize same element fully.Certainly, the diagnosis detecting element in shaking detection element and steering wheel place vibratory response diagnostic device is that the technical scheme of different elements is also within protection scope of the present invention.
Optional or preferred embodiment, detection signal collecting device and diagnostic signal collecting device are same chip as one, or detection signal collecting device and diagnostic signal collecting device are two different chips.Detection signal collecting device and diagnostic signal collecting device can make full use of same chip when being same chip.Certainly, other data processing equipments are used to replace chip also within scope.
Can carry out omnibearing covering to the bang path of more than 90% of a quadr--axle vehicle brake judder according to the multi-wheeled vehicle brake judder diagnostic device that the above embodiment of the present invention provides, to correct finding out main bang path, vibratory response point, radiant provide necessary condition.
The multi-wheeled vehicle brake judder diagnostic method that the embodiment of the present invention provides, at least comprises the following steps:
The multi-wheeled vehicle brake judder diagnostic device that the arbitrary technical scheme of the present invention provides is installed in quadr--axle vehicle.
Carry out brake pressure shake bridge and non-shake bridge contrast verification, draw the cycle of fluctuation of brake pressure during shake, and when judging not shake, whether pressure there is fluctuation.
Draw the chattering frequency of shake parts (being preferably steering wheel).Specifically can convert according to FFT and draw the chattering frequency of steering wheel.FFT is referred to as Fourier transform, is response function digital signal become after mathematical model conversion in frequency domain, can determines vibrational excitation frequency according to FFT spectrogram.Here it is to be noted before carrying out FFT conversion; the present invention first can carry out low-pass filtering, ensures that the noise signal of more than 100Hz is filtered and filters out, and add Hanning window function to signal; the object of windowed function carries out protection digital signal, in order to avoid miss useful data.
According to the vibration frequency calculating brake pressure cycle of fluctuation of the brake pressure that joggling test draws.
Judge whether the vibration frequency of brake pressure coincide in time domain with the chattering frequency of shake parts.The vibration frequency of contrast brake pressure and the chattering frequency of shake parts (being preferably steering wheel), if exist in time domain coincide (peak value appears within the scope of same time domain, crest and trough are corresponding or differ very little in time domain), then determine that brake judder is fluctuated by brake pressure to cause, if in time domain upward peak dislocation (peak value does not appear within the scope of same time domain), and the pressure surge cycle is not obvious, then brake judder and pressure surge correlativity poor or uncorrelated.
Optional or preferred embodiment as one, the multi-wheeled vehicle brake judder diagnostic method that the embodiment of the present invention provides, further comprising the steps of:
Carry out detent stress deformation bench test, and carry out braking excitation diagnosis according to test findings.Detent stress deformation bench test comprises: carry out brake friction test, the stress deformation test of brake drum, the Vibration Modal Test of brake drum respectively to quadr--axle vehicle.This step can determine that brake pressure, brake torque variation are vibration source.Can also judge the ess-strain of brake drum in this step, judge whether it meets material deformation requirement of strength, can examine mode of oscillation, judge whether to need to improve the first natural frequency that braking technique strengthens brake drum, improve excitation frequency.
By in the non-shake bridge in the brake judder bang path diagnostic device of a multi-wheeled vehicle brake judder diagnostic device access quadr--axle vehicle brake circuit, carry out reduced parameter test, at least determine the scope of the vibration frequency under the non-jitter conditions of each bang path, vibration acceleration.Non-shake bridge is in braking procedure, the vibration acceleration test value at vehicle bridge place, steering linkage place, bearing circle place does not all have the bridge of obvious vibration and wave motion, controlling non-shake bridge generally can adopt the new bridge of producer to test, as long as meet above condition all can be considered non-shake.Contrast will pass through test figure, such as shake bridge there will be when the brake is applied, and bearing circle place vibration acceleration there will be signal pulse in time domain scale or fluctuation, but not shake bridge then signal is comparatively steady.
Be that vehicle at the uniform velocity travels in the operating mode of quadr--axle vehicle, when speed reaches predetermined speed per hour, keep foot brake valves to be in scheduled pressure value, carry out medium tenacity braking.Optional or preferred embodiment, predetermined speed per hour is 70km/h as one.Scheduled pressure value is 2bar ~ 2.5bar.
According to the testing result of multi-wheeled vehicle brake judder diagnostic device display, find each direction of transfer and the path of brake judder, and determine the main bang path of vibration.Main bang path is: brake pressure, torque fluctuations-vehicle bridge-suspension-knuckle arm-track rod-steering drag link-pitman arm-turn to column-steering wheel.
Transmission weakening element (this element can be: certain subsystem in multiple bang path) is also removed by the main bang path of result optimizing tested according to shake bridge, non-shake bridge reduced parameter in main bang path.In the bang path of vibration, some transferring elements play incentive action namely to amplify vibration, and some parts play negative consequence to vibration, sees that vibration signal is without obvious fluctuation in testing, namely prove that these parts are not main bang paths, namely abandon the transmission of these parts.Namely do not consider that these parts are as main transmission.Main bang path after optimization: brake pressure, torque fluctuations-vehicle bridge-knuckle arm-steering drag link-pitman arm-turn to column-steering wheel.
Analyze chattering frequency, vibration acceleration, carry out bang path vector quantization.Brake pressure, torque fluctuations (vibration frequency 8Hz ~ 12Hz)-vehicle bridge fore-and-aft direction shake (frequency 8Hz)-knuckle arm around movement locus tangentially shake-steering drag link axially shake (frequency 8.5Hz ~ 10Hz)-pitman arm around rotary motion trace tangentially shake-steering wheel circumferencial direction tangentially shakes (frequency 8Hz ~ 10Hz).
The vibration radiation point of bang path is determined according to resonance theory and Fourier's change.Substantially overlap with steering wheel chattering frequency from the chattering frequency distributed area steering drag link of main bang path, can determine that steering drag link is axially dithered as vibration and amplifies and diffusion point.
Improve vibration source and vibration radiation point place's natural frequency and quality according to bang path, the natural frequency of structural member and excited frequency are avoided.Bang path provides thinking for structure reform, can improve vibration source and vibration radiation point place's natural frequency and quality, allow structural natural frequencies and excited frequency avoid, and improves structural member natural frequency.
The effective measures reducing brake judder are as follows:
1, steering drag link rigidity is increased.Original structure rigidity is k
0=4m π
2f0
2, increase rigidity k
1=1.5 ~ 2k
0.Reduce steering drag link length.Steering drag link raw footage is 1400mm, and its length exceeds one times, normal direction of rotation pull bar.Reducing steering drag link length is about 700mm, with by the single order natural mode of vibration frequency control of pull bar at 150 ~ 200Hz.
2, steering gear constant intensity is increased.Can by steering gear as shown in Figure 7 fixed form improve, be connected with vehicle frame by one piece of riser.And increasing the thickness of steering gear fixed head, added value can be 5mm ~ 10mm.Reinforcement is welded with vehicle frame place at riser.Improve positioning function and the resistance to shock of steering gear.
3, start with from vibration source, brake drum often turns around by exciting twice.The machining precision improving brake drum reduces its face runout amount.Ensure the monolateral jerk value≤0.4mm of brake drum, total jerk value≤0.6mm.Ensure vehicle bridge arranged on left and right sides Brake shoe clearance consistance.
4, improve the flatness of tyre rim, in reduction braking procedure, rim deformation is to the adverse effect of brake drum jerk value.
5, optimize suspension system and vehicle frame junction pin joint, the front pin joint of former suspension, higher than rear pin joint, causes suspension system to shake in driving, after front and back pin joint height is consistent, can reduce suspension place vibration passing.Highly inconsistent, leaf spring is when being subject to ground excitation, can produce bob, when driving source is excessive, spring excitation of beating can be passed to hinge place, thus be passed to vehicle body, make to form vibration in whole vehicle body, weak unfavorable to vibration, hinge height is inconsistent simultaneously, leaf spring vertical direction discontinuity equalization, can produce the vibrational excitation of horizontal direction equally.
Optional or preferred embodiment as one, the length dimension of the steering drag link in quadr--axle vehicle is 650mm ~ 750mm, and the single order natural mode of vibration frequency of steering drag link is 150Hz ~ 200Hz.
The gauge of the steering gear fixed head in quadr--axle vehicle is at least 5mm ~ 10mm, and is welded with reinforcement between the vehicle frame of steering gear fixed head and quadr--axle vehicle.
The monolateral jerk value of the brake drum in quadr--axle vehicle is not more than 0.4mm, and total jerk value is not more than 0.6mm.
Brake-shoe inside brake drum on the left of a quadr--axle vehicle interior vehicle bridge is consistent with the gap between friction disc and the gap between the drum of the brake-shoe inside brake on the right side of vehicle bridge and friction disc.
The performance resisting brake judder of the quadr--axle vehicle of above structure is obviously better than existing quadr--axle vehicle.
Preferred or the optional embodiment as one, quadr--axle vehicle is preferably four bridge truck-mounted cranes.Now, shake bridge is the bridge in four bridge truck-mounted cranes.Certainly, the present invention also can be applied on the vehicle of the vehicle (truck-mounted cranes more than such as four bridges) of more than other quadr--axle vehicles outside four bridge truck-mounted cranes or four bridges and even similar quadr--axle vehicle.
The above-mentioned numerical value provided is only and illustrates, other numerical value outside above-mentioned numerical value are also within protection scope of the present invention.
Arbitrary technical scheme disclosed in the invention described above unless otherwise stated, if the numerical range of it discloses, so disclosed numerical range is preferred numerical range, anyly it should be appreciated by those skilled in the art: preferred numerical range is only the numerical value that in many enforceable numerical value, technique effect is obvious or representative.Because numerical value is more, cannot be exhaustive, so the present invention just discloses component values to illustrate technical scheme of the present invention, and the above-mentioned numerical value enumerated should not form the restriction to the invention protection domain.
Simultaneously, if the invention described above discloses or relate to parts or the structural member of connection fastened to each other, so, unless otherwise stated, be fixedly connected with and can be understood as: can releasably be fixedly connected with (such as using bolt or screw to connect), also can be understood as: to be non-removablely fixedly connected with (such as rivet, weld), certainly, connection fastened to each other also can be replaced by integral type structure (such as use casting, forging or Shooting Technique is integrally formed creates) (obviously cannot adopt except integrally formed technique).
In addition, if there is term for representing position relationship or shape in arbitrary technical scheme disclosed in the invention described above, so the applied term for representing position relationship or shape unless otherwise stated its implication comprises approximate with it, similar or close state or shape.Arbitrary parts provided by the invention both can be assembled by multiple independent ingredient, and also can be one of the forming manufacture technics separate part out.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; Although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or carry out equivalent replacement to portion of techniques feature; And not departing from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope of request of the present invention protection.
Claims (10)
1. a multi-wheeled vehicle brake judder diagnostic device, is characterized in that, comprises brake judder genesis mechanism diagnostic device, brake judder bang path diagnostic device and testing result display device, wherein:
Described brake judder genesis mechanism diagnostic device comprises pressure detecting element, shaking detection element and detection signal collecting device;
Described pressure detecting element, described shaking detection element are all electrically connected by circuit or by wireless signal transceiver with described detection signal collecting device separately;
Described pressure detecting element can detect in quadr--axle vehicle the pressure in the left air chamber shaken in bridge brake circuit, the pressure in right air chamber and the pressure of pin relay valve or the pressure of foot brake valves, and testing result is inputted described detection signal collecting device;
Described shaking detection element can detect the vibration acceleration shaking parts in described quadr--axle vehicle;
Described brake judder bang path diagnostic device comprises diagnosis detecting element and diagnostic signal collecting device;
Described diagnosis detecting element is electrically connected by circuit or by wireless signal transceiver with described diagnostic signal collecting device;
Described diagnosis detecting element can detect the deflection or the vibration acceleration that are in the structural member on vibration force bang path in the brake circuit braking procedure in described quadr--axle vehicle, and testing result is inputted described diagnostic signal collecting device;
Described testing result display device is electrically connected by circuit or by wireless signal transceiver with described detection signal collecting device, described diagnostic signal collecting device;
Input described testing result display device after its testing result obtained separately can be treated to numerical value by described detection signal collecting device and described diagnostic signal collecting device and shown by described testing result display device;
Described pressure detecting element is pressure transducer, it to comprise after left air chamber pressure sensor (8), right air chamber pressure sensor (1), pin relay valve pressure transducer (9) after pressure transducer (7) and foot brake valves, wherein:
Described left air chamber pressure sensor (8) is arranged in the gas feeding duct of described left air chamber or the gas outlet duct of described left air chamber;
In the gas feeding duct that described right air chamber pressure sensor (1) is arranged at described right air chamber or in the gas outlet duct of described right air chamber;
After described pin relay valve, pressure transducer (7) is arranged in described pin relay valve gas outlet duct;
After described foot brake valves, pressure transducer (9) is arranged in the gas outlet duct of described foot brake valves.
2. multi-wheeled vehicle brake judder diagnostic device according to claim 1, it is characterized in that, described brake judder bang path diagnostic device comprise detent place diagnostic device, steeraxle place vibration diagnosis device, steering system place vibration diagnosis device and steering wheel place vibratory response diagnostic device at least one of them, wherein:
Described detent place diagnostic device comprises at least two described diagnosis detecting elements, the braking neck hoof of external margin and described detent that at least two described diagnosis detecting elements are arranged at the detent in described quadr--axle vehicle is respectively with braking from hoof, and the described diagnosis detecting element in described detent place diagnostic device can detect the pulling force distortion of the described detent outside surface of braking moment, pressure distortion and described braking neck hoof, described from the vibration acceleration of hoof braking procedure;
Described steeraxle place vibration diagnosis device comprises at least five described diagnosis detecting elements, at least five described diagnosis detecting elements are arranged on track rod, knuckle arm and the steeraxle in described quadr--axle vehicle respectively, and the described diagnosis detecting element in described steeraxle place vibration diagnosis device can detect the acceleration of the acceleration of the axial vibration of described track rod, described knuckle arm tangential vibrations, described steeraxle centre position and the described steeraxle left and right sides respectively vertical, laterally and the acceleration that longitudinal direction vibrates;
Described steering system place vibration diagnosis device comprises the described diagnosis detecting element on described diagnosis detecting element at least one steering drag link being arranged in described quadr--axle vehicle and tie rod ball that at least one is arranged in described quadr--axle vehicle, and steering system place vibration diagnosis device its can detect the acceleration of described steering drag link axial vibration and the acceleration of described tie rod ball tangential vibrations;
Described steering wheel place vibratory response diagnostic device comprises the described diagnosis detecting element at least one steering wheel being arranged in described quadr--axle vehicle, and it can detect described steering wheel respectively vertical, laterally and the acceleration that longitudinal direction vibrates.
3. multi-wheeled vehicle brake judder diagnostic device according to claim 2, it is characterized in that, described diagnosis detecting element is sensor, and the described diagnosis detecting element in described detent place diagnostic device comprises resistance strain type sensor and acceleration transducer.
4. multi-wheeled vehicle brake judder diagnostic device according to claim 2, it is characterized in that, the described diagnosis detecting element be arranged on described knuckle arm is positioned at described knuckle arm upper surface, and the described diagnosis detecting element being arranged at described steeraxle centre position is positioned at described steeraxle upper surface middle;
The bottom surface axis being arranged at the described diagnosis detecting element on described steering drag link coincides with the axial line of described steering drag link or parallels;
The number being arranged at the described diagnosis detecting element on described steering wheel is at least two, and the described diagnosis detecting element be arranged on described steering wheel is symmetricly set on described steering wheel.
5. multi-wheeled vehicle brake judder diagnostic device according to claim 2, is characterized in that, the described diagnosis detecting element in described shaking detection element and described steering wheel place vibratory response diagnostic device is identity element.
6. according to the arbitrary described multi-wheeled vehicle brake judder diagnostic device of claim 1-5, it is characterized in that, described detection signal collecting device and described diagnostic signal collecting device are same chip, or described detection signal collecting device and described diagnostic signal collecting device are two different chips.
7. a multi-wheeled vehicle brake judder diagnostic method, is characterized in that, at least comprises the following steps:
In quadr--axle vehicle, the arbitrary described multi-wheeled vehicle brake judder diagnostic device of claim 1-6 is installed;
Carry out brake pressure shake bridge and non-shake bridge contrast verification, draw the cycle of fluctuation of brake pressure during shake, and when judging not shake, whether pressure there is fluctuation;
Draw the chattering frequency of shake parts;
According to the vibration frequency calculating brake pressure cycle of fluctuation of the brake pressure that joggling test draws;
Judge whether the vibration frequency of brake pressure coincide in time domain with the chattering frequency of shake parts.
8. multi-wheeled vehicle brake judder diagnostic method according to claim 7, is characterized in that, this multi-wheeled vehicle brake judder diagnostic method is further comprising the steps of:
Carry out detent stress deformation bench test, and carry out braking excitation diagnosis according to test findings;
The brake judder bang path diagnostic device of described multi-wheeled vehicle brake judder diagnostic device is accessed in the non-shake bridge in a described quadr--axle vehicle brake circuit, carry out reduced parameter test, at least determine the scope of the vibration frequency under the non-jitter conditions of each bang path, vibration acceleration;
Be that vehicle at the uniform velocity travels in the operating mode of described quadr--axle vehicle, when speed reaches predetermined speed per hour, keep foot brake valves to be in scheduled pressure value, carry out medium tenacity braking;
According to the testing result of described multi-wheeled vehicle brake judder diagnostic device display, find each direction of transfer and the path of brake judder, and determine the main bang path of vibration;
Transmission weakening element is also removed by the main bang path of result optimizing tested according to shake bridge, non-shake bridge reduced parameter in main bang path;
Analyze chattering frequency, vibration acceleration, carry out bang path vector quantization;
The vibration radiation point of bang path is determined according to resonance theory and Fourier's change;
Improve vibration source and vibration radiation point place's natural frequency and quality according to bang path, the natural frequency of structural member and excited frequency are avoided.
9. the multi-wheeled vehicle brake judder diagnostic method according to claim 7 or 8, is characterized in that, described quadr--axle vehicle is four bridge truck-mounted cranes.
10. multi-wheeled vehicle brake judder diagnostic method according to claim 8, is characterized in that, described shake parts are steering wheel; Described predetermined speed per hour is 70km/h; Described scheduled pressure value is 2bar ~ 2.5bar;
The length dimension of the steering drag link in described quadr--axle vehicle is 650mm ~ 750mm, and the single order natural mode of vibration frequency of described steering drag link is 150Hz ~ 200Hz;
The gauge of the steering gear fixed head in described quadr--axle vehicle is at least 5mm ~ 10mm, and is welded with reinforcement between the vehicle frame of described steering gear fixed head and described quadr--axle vehicle;
The monolateral jerk value of the brake drum in described quadr--axle vehicle is not more than 0.4mm, and total jerk value is not more than 0.6mm.
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| CN105973613A (en) * | 2016-04-27 | 2016-09-28 | 上海理工大学 | Braking judder rack diagnosis device and method thereof |
| CN107525679A (en) * | 2016-06-21 | 2017-12-29 | 上汽通用汽车有限公司 | Test method for the braking shake evaluation of motor vehicle |
| CN106441757B (en) * | 2016-08-31 | 2020-06-19 | 绍兴熔岩机械有限公司 | Vibration method detection device for automobile steering shaft |
| ES2774394T3 (en) * | 2016-10-25 | 2020-07-20 | Siemens Ag | Procedure to optimize movement profiles, procedure to provide movement profiles, control device, installation and software product |
| CN106844875B (en) * | 2016-12-28 | 2020-02-18 | 湖南大学 | Fourier series-based high-speed cam optimization design method |
| US11220251B2 (en) * | 2018-06-20 | 2022-01-11 | GM Global Technology Operations LLC | Detection of a friction brake fault |
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| CN109766635B (en) * | 2019-01-11 | 2023-02-03 | 中国铁路总公司 | Optimized layout method for state perception sensor of mechanical part of locomotive |
| CN113758719A (en) * | 2020-06-01 | 2021-12-07 | 陕西汽车集团有限责任公司 | Truck driving shake detection device |
| CN113834597B (en) * | 2021-10-12 | 2024-03-26 | 中国汽车工程研究院股份有限公司 | Measurement and data processing method for BTV of commercial vehicle disc brake assembly |
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Address after: 221001 Jiangsu city of Xuzhou Province Economic and Technological Development Zone of High Road No. 68 Patentee after: Xuzhou Heavy Machinery Co., Ltd. Address before: 221004 Xuzhou, Zhejiang Province, Jiangsu Road No. 165 Patentee before: Xuzhou Heavy Machinery Co., Ltd. |
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