CN107745744A - A kind of lightweight longitudinal beam of automobile frame structure - Google Patents

A kind of lightweight longitudinal beam of automobile frame structure Download PDF

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Publication number
CN107745744A
CN107745744A CN201710964743.4A CN201710964743A CN107745744A CN 107745744 A CN107745744 A CN 107745744A CN 201710964743 A CN201710964743 A CN 201710964743A CN 107745744 A CN107745744 A CN 107745744A
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CN
China
Prior art keywords
mrow
signal
mtd
transponder
crossbeam
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Pending
Application number
CN201710964743.4A
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Chinese (zh)
Inventor
马海英
张鹏
李鹏
侯晓晓
涂亚楠
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Huanghe Jiaotong University
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Huanghe Jiaotong University
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Priority to CN201710964743.4A priority Critical patent/CN107745744A/en
Publication of CN107745744A publication Critical patent/CN107745744A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B62LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62DMOTOR VEHICLES; TRAILERS
    • B62D21/00Understructures, i.e. chassis frame on which a vehicle body may be mounted
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/023Details
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/013Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over
    • B60R21/0134Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over responsive to imminent contact with an obstacle, e.g. using radar systems
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/013Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over
    • B60R21/0136Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over responsive to actual contact with an obstacle, e.g. to vehicle deformation, bumper displacement or bumper velocity relative to the vehicle
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R2019/026Buffers, i.e. bumpers of limited extent

Abstract

The invention belongs to longitudinal beam of automobile frame technical field, discloses a kind of lightweight longitudinal beam of automobile frame structure, and vehicle frame front end is provided with bumper, and the both ends pin joint of bumper is in longeron front end;The postmedian of longeron is provided with bending frame, and centre is connected with cross-fixing beam;Crossbeam has been bolted among upper and lower longeron;Crossbeam is internally provided with groove;The side of crossbeam is welded with energy absorbing tube;Gap element is provided between longeron and crossbeam rear and front end, bradyseism device is installed in gap element;Support bar is fixed between front and rear crossbeam, connects whole vehicle frame;The middle part of front and rear crossbeam has been bolted expansion link.The present invention is lightweight using structure; it is wear-resisting; the high alloy material of intensity; the weight of car body can integrally be mitigated, acceleration from rest is bigger, can mitigate the injury hit and brought; reduce the impulsive force that contingency is brought; travel safety is improved, the personal safety of driver is protected, greatly facilitates the use of people.

Description

A kind of lightweight longitudinal beam of automobile frame structure
Technical field
The invention belongs to longitudinal beam of automobile frame technical field, more particularly to a kind of lightweight longitudinal beam of automobile frame structure.
Background technology
At present, the use of automobile is a kind of important walking-replacing tool in we live.Also become for the security of automobile Increasingly pay attention to, automobile impacting can bring injury to driver, wherein most crucial part is beam structure, on the market some The beam structure of automobile is not perfect enough, hits aftercarriage and easily deforms, and vehicle body wound is ruined seriously, can cause driver et al. band Carry out life danger.
And the lightweight of automobile, it is exactly on the premise of the intensity and security performance of automobile is ensured, reduces vapour as much as possible The kerb weight of car, so as to improve the dynamic property of automobile, fuel consumption is reduced, reduce exhaust it is demonstrated experimentally that car mass reduces Half, fuel consumption pollution can also reduce nearly half.Due to environmental protection and the needs of energy-conservation, the lightweight of automobile has become generation The trend of boundary's development of automobile.
But existing longitudinal beam of automobile frame Lightweight Technology is in the development phase, many auto makers are slowly innovated And this technology is put into practice, but many technologies are less ripe, chase automotive light weight technology simply so as to cause the reduction of vehicle frame stability, peace Overall coefficient declines, so as to the automobile frame that need to invent a kind of lightweight and stability is taken into account.
With the development of REID, low frequency RF ID transponders are applied in spacing detection engineering more and more, For mark vehicle away from the key facility in detection engineering, prevent key facility to be destroyed, further realize the information-based pipe of spacing Reason, collection of key facility performance parameter etc..So in certain scope, how to be quickly found out and be accurately positioned in spacing The transponder of key facility is identified, and reads its id information, is to solve the problems, such as.Traditional RFID core application is pair Transponder india D reading, the ability that the transponder of spacing is scanned for and is accurately positioned not in certain area.
Nowadays rely on and successfully read transponder india D and can just determine whether transponder.Spacing can not be detected in engineering Transponder the problem of being accurately positioned.
In summary, the problem of prior art is present be:Some vehicle beam structures are not perfect enough on the market, lightweight skill Art is less ripe, and crashworthiness is poor, and automobile impacting can bring injury to driver, it is impossible to meet the needs of people.
The content of the invention
The problem of existing for prior art, the invention provides a kind of lightweight longitudinal beam of automobile frame structure.
The present invention is achieved in that a kind of lightweight longitudinal beam of automobile frame structure, the lightweight longitudinal beam of automobile frame Structure setting has vehicle frame;Vehicle frame front end is provided with bumper, and the both ends pin joint of bumper is in longeron front end;The postmedian of longeron is provided with Frame is bent, centre is connected with cross-fixing beam;Crossbeam has been bolted among upper and lower longeron;Crossbeam is internally provided with recessed Groove;The side of crossbeam is welded with energy absorbing tube;Gap element is provided between longeron and crossbeam rear and front end, is installed in gap element There is bradyseism device;Support bar is fixed between front and rear crossbeam, connects whole vehicle frame;The middle part of front and rear crossbeam passes through bolt It is connected with expansion link;
Car anti-collision is provided with automobile chassis and longeron and hits safe bounce-back knot of giving up the throne, rail mounted is provided with automobile top Mobile air bag, glidepath, are provided with inflatable airbags between bumper and the crossbeam of vehicle frame;Impact resistance safety More breakaway-element channel-section steels of bounce-back knot and locomotive chassis of giving up the throne form split block and are connected, and glidepath is fixedly connected with roof, track Air bag is slidably connected with glidepath for formula movement;
The bumper front end is inlaid with distance-sensor unit, hits pressure inductor unit;The automotive interior edge Equipped with controller;The distance-sensor unit, shock pressure inductor unit, car anti-collision hit safe bounce-back knot of giving up the throne, moved Dynamic air bag, motor, inflatable airbags have passed through wire connection controller;
The distance-sensor unit includes FPGA components, radiating circuit component, receiving circuit component, amplification filtering group Part, AD conversion component;Radiating circuit component and receive circuit unit and be connected with antenna:
FPGA components, for input and output control, task scheduling, signal modulation, a/d converter control, digital filtering, ripple Shape is identified and RSS is calculated;
Radiating circuit component, it is connected with FPGA components, for the signal after modulation to be carried out into power amplification, is sent out by antenna It is shot out;
Receiving circuit component, it is connected with radiating circuit component, is connected with antenna, letter is returned for receiving transponder from antenna Number;
Amplify filtering unit, be connected with receiving circuit component, the return signal received belongs to small-signal, to the signal Sampling can be just digitized after being filtered amplification;
AD conversion component, it is connected with amplification filtering unit, for periodic sampling to be fixed to amplifying filtered signal;
The FPGA components further comprise:
IOC, for carrying out encoding and decoding to input through keyboard, generate user command;
Signal conditioning package, for carrier signal generation and will need the order for being sent to transponder be modulated at carrier wave letter On number;
Digital filtering component, the data signal for being obtained to sampling carry out bandwidth filtering, remove interference;
Waveform recognition component, for calculating local maximum to filtered data signal, identify the ripple of a cycle Shape;
RSS is calculated and decoding assembly, for calculating received signal strength from Wave data, according to transponder return signal Coding rule, signal is decoded, extraction transponder return data;
The distance-finding method of the distance-sensor unit includes:Reader periodically sends exploration carrier signal first, Calculate the return signal intensity RSS and ambient signal strength RSSe of each detective period;
Secondly RSS is modified with RSSe, obtains the valid signal strengths RSSr of detective period transponder return, calculated Return signal intensity of the average RSSa of the valid signal strengths of multiple detective periods as transponder;
The RSSa finally obtained according to reader after stable, by tabling look-up or being calculated between transponder and reader Distance, realize being accurately positioned for transponder;
It is a bit of carrier signal that reader is periodically launched that transponder, which explores signal, each segment Carrier cycle issue is N, can be determined between each segment at intervals of T, T and N by experiment:N value ensures transponder antenna Sense enough energy;T value will ensure the return signal of the previous detective period of transponder without interference with this periodic signal The calculating of strength signal, i.e., the energy complete attenuation that a cycle receives on transponder;
Reader measuring environment signal intensity RSSe first;Then the detection carrier signal in N number of cycle is launched, then Return signal intensity RSS is measured afterwards, and measuring method is identical twice, and forms a detective period, is obtained according to RSSe and RSS The valid signal strengths RSSr of the detective period;
With the signal intensity RSS obtained after emission detection carrier wave, have ready conditions and subtract ambient signal strength RSSe, such as formula:
The RSSr of M detective period average value is taken to form a signal intensity update cycle, such as formula as RSSa:
The shock pressure inductor unit is adopted with perceptron within the independent sampling period to echo signal x (t) Collection, and digital quantization is carried out to signal with A/D modes;Then, dimensionality reduction is carried out to the signal x (i) after quantization;Finally, to dimensionality reduction Signal afterwards is reconstructed;Wherein t is sampling instant, and i is the signal sequence after quantifying;
Dimensionality reduction, the difference for specifically passing through finite impulse response filter to the signal after quantization are carried out to the signal after quantization Divide equationI=1 ..., M, wherein h (0) ..., h (L-1) are filter coefficient, and design is based on filtering Compressed sensing signal acquisition framework, construct following Teoplitz calculation matrix:
Then observeI=1 ..., M, wherein b1,…,bLRegard filter coefficient as;Submatrix ΦFT Singular value be gram matrix G (ΦF, T) and=Φ 'FTΦFTThe arithmetic root of characteristic value, checking G (Φ F, T) all eigenvalue λs i∈(1-δK,1+δK), i=1 ..., T, then ΦFMeet RIP, and by solving following l1Optimization problem reconstructs original signal:
Original signal, that is, BP algorithm are reconstructed by linear programming method;
For actual compression signal, such as the collection of voice or picture signal, then Φ is changedFFor following form:
If signal conversion basic matrix Ψ on have it is openness, by solving following l1Optimization problem, accurate weight Structure goes out original signal:
Wherein Φ is uncorrelated to Ψ, and Ξ is referred to as CS matrixes;
Further, inflating movable air bag is provided with motor, electric-motor drive wheel, how intermeshing to the rail mounted Travelling gear, soft power deflecting groove, and upper lower sheave, motor are arranged on rail type mobile air bag rear portion, travelling gear The both sides of rail type mobile air bag are arranged on, rack is provided with the glide path on automobile top both sides, motor passes Driving wheel engages with travelling gear, and multiple travelling gears also engage with glide path rack respectively.
Further, the inflatable airbags and rail type mobile are respectively arranged with inflating nozzle on air bag, And be connected by gas ducting with automobile source of the gas, be additionally provided with inflatable airbags it is multiple be impacted compression when can deflate Valve.
Further, the longeron is hollow.
Further, the inside grooves are welded with U-tube.
Further, it is filled with buffer solution in the gap element.
Further, the controller is built-in with signal control module, the digital modulation signals x's (t) of signal control module Fractional lower-order ambiguity function is expressed as:
Wherein, τ is delay skew, and f is Doppler frequency shift, 0 < a, b < α/2, x*(t) x (t) conjugation is represented, as x (t) For real signal when, x (t)< p >=| x (t) |< p >sgn(x(t));When x (t) is time multiplexed signal, [x (t)]< p >=| x (t) |p-1x* (t)。
Advantages of the present invention and good effect are:The present invention is lightweight using structure, wear-resisting, the high alloy material of intensity Material, longeron it is hollow be designed to the overall weight for mitigating car body, acceleration from rest is bigger, by U-tube and energy absorbing tube Use, the injury hit and brought can be mitigated significantly;Equipped with bradyseism device and bending frame, so as to which that reduces that contingency brings rushes Power is hit, greatly improves travel safety, the personal safety of driver is protected, greatly facilitates the use of people.
The present invention has the ability of anti-different degrees of external blow, when bumper is accidentally impacted, set Multiple valves between bumper and vehicle body on air bag can make different degrees of deflation and bounce-back, while be located at bumper Pressure switch below makes automobile emergency brake through control system, closes engine and connects motor power, makes automobile top Rail type mobile air bag along downing track be moved to Chinese herbaceous peony air bag junction and by magnet strength hold, formed Barrier together with Chinese herbaceous peony orientation and back side, alleviate and the effect of rebounce power, protection department multiply people so as to effectively achieve to absorb The safety of member, the impact resistance being arranged on automobile chassis and vehicle frame bounce-back knot of giving up the throne safely can effectively slow down the shocks of various intensity Power, the personnel of in-car is safely and effectively protected, can also make car body keep not deforming because being impacted completely.
The setting of distance-sensor unit, shock pressure inductor unit, controller of the present invention has fully ensured that safety Need.
In distance-finding method provided by the invention, after reader launches one section of carrier signal, it is strong and then to measure reception signal RSS is spent, the presence or absence of transponder and relative bearing and distance with reader are determined according to RSS.General principle is:Carrier wave is believed After number terminating, due to the presence of transponder own resonance circuit, the resonant frequency signal gradually to decay can be produced, reader receives Received signal strength RSS corresponding to the signal and calculating, the RSS values are determined by the relative bearing and distance of transponder and reader It is fixed;To eliminate environmental disturbances, before reader launches carrier wave, received signal strength when measuring unloaded first is strong as ambient signal RSSe is spent, RSS is modified with RSSe.This method changes the application that traditional RFID technique is mainly used in reading transponder india D Mode, particularly suitable for spacing detect engineering in RFID transponders, be also applied for tradition application in, by response detected device come Read operation is triggered, reduces reader power consumption.
Compared with prior art, the beneficial effects of the invention are as follows:
1st, transponder india D read operations need not be performed, you can judge whether there is transponder in reader electromagnetic field;
2nd, accurate relative positioning can be carried out to spacing.The variation tendency of foundation return signal intensity, mobile reader, The maximum of signal intensity is found, then the distance between reader and transponder can be worth to according to the maximum, so as to standard Relative positioning really is carried out to transponder;
3rd, in tradition application, detected first using this method, transponder india D read operations are triggered using result of detection, dropped Low reader operating power consumption.
The present invention hits the pressure sensitive method of pressure inductor unit, the signal modulating method of control module, can obtain Accurate data, guarantee is provided for the operation of postorder.
Brief description of the drawings
Fig. 1 is the structural representation of lightweight longitudinal beam of automobile frame structure provided in an embodiment of the present invention;
In figure:1st, vehicle frame;2nd, bumper;3rd, longeron;4th, frame is bent;5th, cross-fixing beam;6th, crossbeam;7th, groove;8th, inhale Can pipe;9th, gap element;10th, bradyseism device;11st, support bar;12nd, expansion link;13rd, U-tube.
Fig. 2 is inflatable airbags connection diagram provided in an embodiment of the present invention.
Fig. 3 be automobile chassis impact resistance provided in an embodiment of the present invention give up the throne safely bounce-back junction structure schematic diagram.
In figure:1st, channel-section steel;2nd, bumper;3rd, first bloom of giving up the throne is slided;4th, second bloom of giving up the throne is slided;5th, positioning resistance Bloom;6th, safety is given up the throne to rebound and tied;7th, screw rod;8th, the first spring;9th, second spring;10th, nut;11st, alignment pin;12nd, hydraulic pressure Device;13rd, the first drag backing plate;14th, the second drag backing plate;15th, rail type mobile air bag;16th, motor;17th, it is electric Motivation drive;18th, travelling gear;19th, glide path;20th, soft power deflecting groove;21st, upper and lower pulley;22nd, glide path rack;23、 Magnet;24th, inflatable airbags, 25, valve;26th, vehicle frame;27th, bumper;28th, longeron;29th, frame is bent;30th, intersect solid Determine beam;31st, crossbeam;32nd, groove;33rd, energy absorbing tube;34th, gap element;35th, bradyseism device;36th, support bar;37th, expansion link;38、U Type pipe.
Fig. 4 is provided in an embodiment of the present invention when being explored using mobile RFID reader to transponder, signal intensity Calculate and explore the schematic diagram that pulse is sent.
Fig. 5 be it is provided in an embodiment of the present invention using reader designated area search for transponder and to transponder carry out The basic principle schematic of positioning.
Embodiment
In order to further understand the content, features and effects of the present invention, hereby enumerating following examples, and coordinate accompanying drawing Describe in detail as follows.
Some vehicle beam structures are not perfect enough on the market, and Lightweight Technology is less ripe, and crashworthiness is poor, car hit Injury can be brought to driver by hitting, it is impossible to meet the needs of people.
The structure of the present invention is explained in detail below in conjunction with the accompanying drawings.
As shown in figure 1, lightweight longitudinal beam of automobile frame structure setting provided in an embodiment of the present invention has vehicle frame 26, vehicle frame 26 Front end is provided with bumper 27, and the both ends pin joint of bumper 27 is in the front end of longeron 28;The postmedian of longeron 28 is provided with bending frame 29, in Between be connected with cross-fixing beam 30;Crossbeam 31 has been bolted among upper and lower longeron 28;Crossbeam 31 is internally provided with recessed Groove 32;The side of crossbeam 30 is welded with energy absorbing tube 33;Gap element 34 is provided between longeron 28 and the rear and front end of crossbeam 31, Bradyseism device 35 is installed in gap unit 34;Support bar 36 is fixed between front and rear crossbeam 31, connects whole vehicle frame 26;Front and rear The middle part of crossbeam 31 has been bolted expansion link 37.
The bumper front end is inlaid with distance-sensor unit, hits pressure inductor unit;The automotive interior edge Equipped with controller;The distance-sensor unit, shock pressure inductor unit, car anti-collision hit safe bounce-back knot of giving up the throne, moved Dynamic air bag, motor, inflatable airbags have passed through wire connection controller;
The distance-sensor unit includes FPGA components, radiating circuit component, receiving circuit component, amplification filtering group Part, AD conversion component;Radiating circuit component and receive circuit unit and be connected with antenna:
FPGA components, for input and output control, task scheduling, signal modulation, a/d converter control, digital filtering, ripple Shape is identified and RSS is calculated;
Radiating circuit component, it is connected with FPGA components, for the signal after modulation to be carried out into power amplification, is sent out by antenna It is shot out;
Receiving circuit component, it is connected with radiating circuit component, is connected with antenna, letter is returned for receiving transponder from antenna Number;
Amplify filtering unit, be connected with receiving circuit component, the return signal received belongs to small-signal, to the signal Sampling can be just digitized after being filtered amplification;
AD conversion component, it is connected with amplification filtering unit, for periodic sampling to be fixed to amplifying filtered signal;
The FPGA components further comprise:
IOC, for carrying out encoding and decoding to input through keyboard, generate user command;
Signal conditioning package, for carrier signal generation and will need the order for being sent to transponder be modulated at carrier wave letter On number;
Digital filtering component, the data signal for being obtained to sampling carry out bandwidth filtering, remove interference;
Waveform recognition component, for calculating local maximum to filtered data signal, identify the ripple of a cycle Shape;
RSS is calculated and decoding assembly, for calculating received signal strength from Wave data, according to transponder return signal Coding rule, signal is decoded, extraction transponder return data;
The distance-finding method of the distance-sensor unit includes:Reader periodically sends exploration carrier signal first, Calculate the return signal intensity RSS and ambient signal strength RSSe of each detective period;
Secondly RSS is modified with RSSe, obtains the valid signal strengths RSSr of detective period transponder return, calculated Return signal intensity of the average RSSa of the valid signal strengths of multiple detective periods as transponder;
The RSSa finally obtained according to reader after stable, by tabling look-up or being calculated between transponder and reader Distance, realize being accurately positioned for transponder;
It is a bit of carrier signal that reader is periodically launched that transponder, which explores signal, each segment Carrier cycle issue is N, can be determined between each segment at intervals of T, T and N by experiment:N value ensures transponder antenna Sense enough energy;T value will ensure the return signal of the previous detective period of transponder without interference with this periodic signal The calculating of strength signal, i.e., the energy complete attenuation that a cycle receives on transponder;
Reader measuring environment signal intensity RSSe first;Then the detection carrier signal in N number of cycle is launched, then Return signal intensity RSS is measured afterwards, and measuring method is identical twice, and forms a detective period, is obtained according to RSSe and RSS The valid signal strengths RSSr of the detective period;
With the signal intensity RSS obtained after emission detection carrier wave, have ready conditions and subtract ambient signal strength RSSe, such as formula:
The RSSr of M detective period average value is taken to form a signal intensity update cycle, such as formula as RSSa:
The shock pressure inductor unit is adopted with perceptron within the independent sampling period to echo signal x (t) Collection, and digital quantization is carried out to signal with A/D modes;Then, dimensionality reduction is carried out to the signal x (i) after quantization;Finally, to dimensionality reduction Signal afterwards is reconstructed;Wherein t is sampling instant, and i is the signal sequence after quantifying;
Dimensionality reduction, the difference for specifically passing through finite impulse response filter to the signal after quantization are carried out to the signal after quantization Divide equationI=1 ..., M, wherein h (0) ..., h (L-1) are filter coefficient, and design is based on filtering Compressed sensing signal acquisition framework, construct following Teoplitz calculation matrix:
Then observeI=1 ..., M, wherein b1,…,bLRegard filter coefficient as;Submatrix ΦFTSingular value be gram matrix G (ΦF, T) and=Φ 'FTΦFTThe arithmetic root of characteristic value, checking G (Φ F, T) all spies Value indicative λ i ∈ (1- δK,1+δK), i=1 ..., T, then ΦFMeet RIP, and by solving following l1Optimization problem reconstructs original Signal:
Original signal, that is, BP algorithm are reconstructed by linear programming method;
For actual compression signal, such as the collection of voice or picture signal, then Φ is changedFFor following form:
If signal conversion basic matrix Ψ on have it is openness, by solving following l1Optimization problem, accurate weight Structure goes out original signal:
Wherein Φ is uncorrelated to Ψ, and Ξ is referred to as CS matrixes.
The longeron 28 is hollow.
The internal welding of groove 32 is connected to U-tube 38.
Buffer solution is filled with the gap element 34.
The present invention connects equipment, and length can be adjusted according to expansion link, to be applicable different vehicles;Bradyseism device, delay The accidental shock of fliud flushing, engagement flex frame meeting buffer bumper;Energy absorbing tube is welded on the both sides of crossbeam, can absorb shock and bring Most injury, protect the personal safety of driver;U-tube is fixed by welding in the groove of crossbeam, Neng Gouzai Once alleviate injury, the injury that can farthest avoid body distortion and bring.
As shown in Figure 2 and Figure 3, lightweight longitudinal beam of automobile frame structure provided in an embodiment of the present invention, in addition to
Channel-section steel 1;Bumper 2;First slides bloom 3 of giving up the throne;Second slides bloom 4 of giving up the throne;Positioning resistance bloom 5;Safety Give up the throne bounce-back knot 6;Screw rod 7;First spring 8;Second spring 9;Nut 10;Alignment pin 11;Hydraulic means 12;First drag backing plate 13;Second drag backing plate 14;Rail type mobile air bag 15;Motor 16;Electric-motor drive wheel 17;Travelling gear 18; Glide path 19;Soft power deflecting groove 20;Upper and lower pulley 21;Glide path rack 22;Magnet 23;Inflatable airbags 24, valve 25。
The more root long bar channel-section steels 1 of automobile chassis, bumper 2, on automobile chassis and vehicle frame being provided with car anti-collision hits safety Give up the throne bounce-back knot 6, rail type mobile air bag 15, glidepath 19 are provided with automobile top;Bumper and vehicle frame it Between be additionally provided with inflatable airbags 24, impact resistance more breakaway-element channel-section steels of bounce-back knot 6 and locomotive chassis of giving up the throne safely are formed point Body block is connected, and glidepath 19 is fixedly connected with roof, and air bag 15 is slidably connected rail type mobile with glidepath 19.
Air bag 15 is provided with motor 16, electric-motor drive wheel 17, how intermeshing to the rail type mobile Travelling gear 18, soft power deflecting groove 20, and upper lower sheave 21, motor 16 are arranged on rail type mobile after air bag 15 Portion, travelling gear 18 are arranged on the both sides of rail type mobile air bag 15, set on the glide path 19 on automobile top both sides Be equipped with rack 22, electric-motor drive wheel 17 engages with travelling gear 18, multiple travelling gears 18 also respectively with glide path rack 22 Engagement.
The inflatable airbags 24 and rail type mobile are respectively arranged with inflating nozzle on air bag 15, and lead to Overcharge feed channel to be connected with automobile source of the gas, can deflate valve when being additionally provided with multiple be impacted in inflatable airbags 24 25。
The controller is built-in with signal control module, the digital modulation signals x (t) of signal control module fractional lower-order Ambiguity function is expressed as:
Wherein, τ is delay skew, and f is Doppler frequency shift, 0 < a, b < α/2, x*(t) x (t) conjugation is represented, as x (t) For real signal when, x (t)< p >=| x (t) |< p >sgn(x(t));When x (t) is time multiplexed signal, [x (t)]< p >=| x (t) |p-1x* (t)。
The present invention has the ability of anti-different degrees of external blow, is surprisingly hit in bumper or other positions When hitting, the multiple valves being arranged between bumper and vehicle body on air bag can make different degrees of deflation and bounce-back, simultaneously Be located at the pressure switch behind bumper makes automobile emergency brake through control system, closes engine and connects motor power, Making the rail type mobile of automobile top, air bag is moved to Chinese herbaceous peony air bag junction and strong by magnet along downing track Add and hold, form one of orientation of Chinese herbaceous peony barrier, so as to effectively achieve the effect for absorbing alleviation and rebounce power, protection department multiplies The safety of personnel, be arranged on automobile chassis front and back ends impact resistance give up the throne safely bounce-back knot can effectively slow down hitting for various intensity Power is hit, the personnel of in-car is safely and effectively protected, can also make car body keep not deforming because being impacted completely.
When automobile is by micro- strength and compared with strong impaction, air bag and safety are moved back for air bag, rail type mobile Screw rod 7 that position bounce-back is tied, the first spring 8 participate in absorbing jointly to be alleviated and rebounce power, driver and conductor is had in time The protection of effect, when being hit by strength and HHT higher high tensile, the second spring 9 and hydraulic means 12 that bounce-back of giving up the throne safely is tied are also common With absorption alleviation and the rebounce main force is participated in, it can make automobile entirety is basic to keep completely.
Fig. 4 is provided in an embodiment of the present invention when being explored using mobile RFID reader to transponder, signal intensity Calculate and explore the schematic diagram that pulse is sent.
Fig. 5 be it is provided in an embodiment of the present invention using reader designated area search for transponder and to transponder carry out The basic principle schematic of positioning.
It is described above to be only the preferred embodiments of the present invention, any formal limitation not is made to the present invention, Every technical spirit according to the present invention belongs to any simple modification made for any of the above embodiments, equivalent variations and modification In the range of technical solution of the present invention.

Claims (7)

1. a kind of lightweight longitudinal beam of automobile frame structure, it is characterised in that the lightweight longitudinal beam of automobile frame structure setting has Vehicle frame;Vehicle frame front end is provided with bumper, and the both ends pin joint of bumper is in longeron front end;The postmedian of longeron is provided with bending frame, in Between be connected with cross-fixing beam;Crossbeam has been bolted among upper and lower longeron;Crossbeam is internally provided with groove;The side of crossbeam Face is welded with energy absorbing tube;Gap element is provided between longeron and crossbeam rear and front end, bradyseism device is installed in gap element;Before Support bar is fixed between crossbeam afterwards, connects whole vehicle frame;The middle part of front and rear crossbeam has been bolted flexible Bar;
Car anti-collision is provided with automobile chassis and longeron and hits safe bounce-back knot of giving up the throne, rail type mobile is provided with automobile top Air bag, glidepath, inflatable airbags are provided between bumper and the crossbeam of vehicle frame;Impact resistance is given up the throne safely More breakaway-element channel-section steels of bounce-back knot and locomotive chassis form split block and are connected, and glidepath is fixedly connected with roof, and rail mounted moves Dynamic air bag is slidably connected with glidepath;
The bumper front end is inlaid with distance-sensor unit, hits pressure inductor unit;The automotive interior is installed with Controller;The distance-sensor unit, shock pressure inductor unit, car anti-collision hit safety and have given up the throne bounce-back knot, movement Air bag, motor, inflatable airbags have passed through wire connection controller;
The distance-sensor unit includes FPGA components, radiating circuit component, receiving circuit component, amplification filtering unit, AD Transition components;Radiating circuit component and receive circuit unit and be connected with antenna:
FPGA components, know for input and output control, task scheduling, signal modulation, a/d converter control, digital filtering, waveform Do not calculated with RSS;
Radiating circuit component, it is connected with FPGA components, for the signal after modulation to be carried out into power amplification, is launched by antenna Go;
Receiving circuit component, it is connected with radiating circuit component, is connected with antenna, for receives transponder return signal from antenna;
Amplify filtering unit, be connected with receiving circuit component, the return signal received belongs to small-signal, and the signal is carried out Sampling can be just digitized after filter and amplification;
AD conversion component, it is connected with amplification filtering unit, for periodic sampling to be fixed to amplifying filtered signal;
The FPGA components further comprise:
IOC, for carrying out encoding and decoding to input through keyboard, generate user command;
Signal conditioning package, for carrier signal generation and the order for being sent to transponder will be needed to be modulated at carrier signal On;
Digital filtering component, the data signal for being obtained to sampling carry out bandwidth filtering, remove interference;
Waveform recognition component, for calculating local maximum to filtered data signal, identify the waveform of a cycle;
RSS is calculated and decoding assembly, for calculating received signal strength from Wave data, the volume according to transponder return signal Code rule, is decoded to signal, the data that extraction transponder returns;
The distance-finding method of the distance-sensor unit includes:Reader periodically sends exploration carrier signal first, calculates The return signal intensity RSS and ambient signal strength RSSe of each detective period;
Secondly RSS is modified with RSSe, obtains the valid signal strengths RSSr of detective period transponder return, calculated multiple Return signal intensity of the average RSSa of the valid signal strengths of detective period as transponder;
The RSSa finally obtained according to reader after stable, by table look-up or be calculated between transponder and reader away from From realizing being accurately positioned for transponder;
It is a bit of carrier signal that reader is periodically launched that transponder, which explores signal, the carrier wave of each segment Periodicity is N, can be determined between each segment at intervals of T, T and N by experiment:N value ensures that transponder antenna senses To enough energy;T value will ensure the return signal of the previous detective period of transponder without interference with this cycle signal intensity The calculating of signal, i.e., the energy complete attenuation that a cycle receives on transponder;
Reader measuring environment signal intensity RSSe first;Then the detection carrier signal in N number of cycle is launched, followed by Return signal intensity RSS is measured, measuring method is identical twice, and forms a detective period, and the spy is obtained according to RSSe and RSS The valid signal strengths RSSr in rope cycle;
With the signal intensity RSS obtained after emission detection carrier wave, have ready conditions and subtract ambient signal strength RSSe, such as formula:
<mrow> <mi>R</mi> <mi>S</mi> <mi>S</mi> <mi>r</mi> <mo>=</mo> <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <mn>0</mn> <mo>,</mo> </mrow> </mtd> <mtd> <mrow> <mi>i</mi> <mi>f</mi> <mi> </mi> <mi>R</mi> <mi>S</mi> <mi>S</mi> <mo>&lt;</mo> <mi>R</mi> <mi>S</mi> <mi>S</mi> <mi>e</mi> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mi>R</mi> <mi>S</mi> <mi>S</mi> <mo>-</mo> <mi>R</mi> <mi>S</mi> <mi>S</mi> <mi>e</mi> <mo>,</mo> </mrow> </mtd> <mtd> <mrow> <mi>e</mi> <mi>l</mi> <mi>s</mi> <mi>e</mi> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>;</mo> </mrow>
The RSSr of M detective period average value is taken to form a signal intensity update cycle, such as formula as RSSa:
<mrow> <mi>R</mi> <mi>S</mi> <mi>S</mi> <mi>a</mi> <mo>=</mo> <mfrac> <mn>1</mn> <mi>M</mi> </mfrac> <munderover> <mo>&amp;Sigma;</mo> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>M</mi> </munderover> <msub> <mi>RSSr</mi> <mi>i</mi> </msub> <mo>;</mo> </mrow>
The shock pressure inductor unit is acquired with perceptron within the independent sampling period to echo signal x (t), and Digital quantization is carried out to signal with A/D modes;Then, dimensionality reduction is carried out to the signal x (i) after quantization;Finally, to the letter after dimensionality reduction Number it is reconstructed;Wherein t is sampling instant, and i is the signal sequence after quantifying;
Dimensionality reduction, the difference side for specifically passing through finite impulse response filter to the signal after quantization are carried out to the signal after quantization JourneyWherein h (0) ..., h (L-1) are filter coefficient, and design is based on filtering Compressed sensing signal acquisition framework, construct following Teoplitz calculation matrix:
Then observeWherein b1,…,bLRegard filter coefficient as;Submatrix ΦFT Singular value be gram matrix G (ΦF, T) and=Φ 'FTΦFTThe arithmetic root of characteristic value, checking G (Φ F, T) all eigenvalue λs i∈(1-δK,1+δK), i=1 ..., T, then ΦFMeet RIP, and by solving following l1Optimization problem reconstructs original signal:
<mfenced open = "" close = ""> <mtable> <mtr> <mtd> <mrow> <munder> <mrow> <mi>m</mi> <mi>i</mi> <mi>n</mi> </mrow> <mi>x</mi> </munder> <mo>|</mo> <mo>|</mo> <mi>x</mi> <mo>|</mo> <msub> <mo>|</mo> <mn>1</mn> </msub> </mrow> </mtd> <mtd> <mrow> <mi>s</mi> <mo>.</mo> <mi>t</mi> <mo>.</mo> </mrow> </mtd> <mtd> <mrow> <mi>y</mi> <mo>=</mo> <msub> <mi>&amp;Phi;</mi> <mi>x</mi> </msub> </mrow> </mtd> </mtr> </mtable> </mfenced>
Original signal, that is, BP algorithm are reconstructed by linear programming method;
For actual compression signal, such as the collection of voice or picture signal, then Φ is changedFFor following form:
If signal conversion basic matrix Ψ on have it is openness, by solving following l1Optimization problem, Accurate Reconstruction go out original Signal:
<mfenced open = "" close = ""> <mtable> <mtr> <mtd> <mrow> <munder> <mrow> <mi>m</mi> <mi>i</mi> <mi>n</mi> </mrow> <mi>&amp;alpha;</mi> </munder> <mo>|</mo> <mo>|</mo> <mi>&amp;alpha;</mi> <mo>|</mo> <msub> <mo>|</mo> <mn>1</mn> </msub> </mrow> </mtd> <mtd> <mrow> <mi>s</mi> <mo>.</mo> <mi>t</mi> <mo>.</mo> </mrow> </mtd> <mtd> <mrow> <mi>y</mi> <mo>=</mo> <msub> <mi>&amp;Phi;</mi> <mi>x</mi> </msub> <mo>=</mo> <mi>&amp;Phi;</mi> <mi>&amp;Psi;</mi> <mi>&amp;alpha;</mi> <mo>=</mo> <mi>&amp;Xi;</mi> <mi>&amp;alpha;</mi> <mo>;</mo> </mrow> </mtd> </mtr> </mtable> </mfenced>
Wherein Φ is uncorrelated to Ψ, and Ξ is referred to as CS matrixes.
2. lightweight longitudinal beam of automobile frame structure as claimed in claim 1, it is characterised in that rail mounted inflating movable gas Capsule is provided with motor, electric-motor drive wheel, how intermeshing travelling gear, soft power deflecting groove, and upper lower sheave, motor It is arranged on rail type mobile air bag rear portion, travelling gear is arranged on the both sides of rail type mobile air bag, in vapour Rack is provided with the glide path on roof both sides, electric-motor drive wheel engages with travelling gear, and multiple travelling gears are also distinguished Engaged with glide path rack.
3. lightweight longitudinal beam of automobile frame structure as claimed in claim 1, it is characterised in that the inflatable airbags and rail Road formula movement is respectively arranged with inflating nozzle on air bag, and is connected by gas ducting with automobile source of the gas, is inflating Multiple valves that can be deflated when being pressurized that are impacted are additionally provided with air bag.
4. lightweight longitudinal beam of automobile frame structure as claimed in claim 1, it is characterised in that the longeron is hollow.
5. lightweight longitudinal beam of automobile frame structure as claimed in claim 1, it is characterised in that the inside grooves are welded with U-shaped Pipe.
6. lightweight longitudinal beam of automobile frame structure as claimed in claim 1, it is characterised in that filled with slow in the gap element Fliud flushing.
7. lightweight longitudinal beam of automobile frame structure as claimed in claim 1, it is characterised in that the controller is built-in with signal control Molding block, the digital modulation signals x (t) of signal control module fractional lower-order ambiguity function are expressed as:
<mrow> <mi>&amp;chi;</mi> <mrow> <mo>(</mo> <mi>&amp;tau;</mi> <mo>,</mo> <mi>f</mi> <mo>)</mo> </mrow> <mo>=</mo> <msubsup> <mo>&amp;Integral;</mo> <mrow> <mo>-</mo> <mi>&amp;infin;</mi> </mrow> <mi>&amp;infin;</mi> </msubsup> <msup> <mrow> <mo>&amp;lsqb;</mo> <mi>x</mi> <mrow> <mo>(</mo> <mi>t</mi> <mo>+</mo> <mi>&amp;tau;</mi> <mo>/</mo> <mn>2</mn> <mo>)</mo> </mrow> <mo>&amp;rsqb;</mo> </mrow> <mrow> <mo>&lt;</mo> <mi>a</mi> <mo>&gt;</mo> </mrow> </msup> <msup> <mrow> <mo>&amp;lsqb;</mo> <msup> <mi>x</mi> <mo>*</mo> </msup> <mrow> <mo>(</mo> <mi>t</mi> <mo>-</mo> <mi>&amp;tau;</mi> <mo>/</mo> <mn>2</mn> <mo>)</mo> </mrow> <mo>&amp;rsqb;</mo> </mrow> <mrow> <mo>&lt;</mo> <mi>b</mi> <mo>&gt;</mo> </mrow> </msup> <msup> <mi>e</mi> <mrow> <mo>-</mo> <mi>j</mi> <mn>2</mn> <mi>&amp;pi;</mi> <mi>f</mi> <mi>t</mi> </mrow> </msup> <mi>d</mi> <mi>t</mi> <mo>;</mo> </mrow>
Wherein, τ is delay skew, and f is Doppler frequency shift, 0 < a, b < α/2, x*(t) x (t) conjugation is represented, when x (t) is real During signal, x (t)< p >=| x (t) |< p >sgn(x(t));When x (t) is time multiplexed signal, [x (t)]< p >=| x (t) |p-1x*(t)。
CN201710964743.4A 2017-10-17 2017-10-17 A kind of lightweight longitudinal beam of automobile frame structure Pending CN107745744A (en)

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* Cited by examiner, † Cited by third party
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CN201264575Y (en) * 2008-08-20 2009-07-01 鲁银运 Automobile air bag security device
CN103036573A (en) * 2012-12-03 2013-04-10 南京工业大学 Compressed sensing signal collection method based on filtering
CN103909973A (en) * 2012-12-28 2014-07-09 马自达汽车株式会社 Structure of front portion of vehicle body
CN105373753A (en) * 2015-12-18 2016-03-02 西安电子科技大学 Method for searching and relatively positioning responder by using mobile RFID reader
CN106067004A (en) * 2016-05-30 2016-11-02 西安电子科技大学 The recognition methods of digital modulation signals under a kind of impulsive noise

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006088755A (en) * 2004-09-21 2006-04-06 Takata Corp Colliding object distinguishing device and protection device
CN201264575Y (en) * 2008-08-20 2009-07-01 鲁银运 Automobile air bag security device
CN103036573A (en) * 2012-12-03 2013-04-10 南京工业大学 Compressed sensing signal collection method based on filtering
CN103909973A (en) * 2012-12-28 2014-07-09 马自达汽车株式会社 Structure of front portion of vehicle body
CN105373753A (en) * 2015-12-18 2016-03-02 西安电子科技大学 Method for searching and relatively positioning responder by using mobile RFID reader
CN106067004A (en) * 2016-05-30 2016-11-02 西安电子科技大学 The recognition methods of digital modulation signals under a kind of impulsive noise

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Application publication date: 20180302