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哈爾濱工業(yè)大學(xué)華德應(yīng)用技術(shù)學(xué)院畢業(yè)設(shè)計(jì)(論文)
附錄1
Domestic and international research current situation and existing problem
Mechanism taking place in vibration sum noise of applying the brake
It is launching on the basis of drum type brake that the early vibration noise of applying the brake is studied, and the day of the brake with a type
The extensive application of benefit, the vibration noise causes people's attention too to apply the brake. The grinding of vibration noise of applying the brake of the a type brake Studied carefully and started it in the thirties of last century, had already solved many project problems and set up various strength theoretically at present Study models. Up until now, the research of this field has design been from brake to power alreadied from mechanism to analytical method.
Study the system, operating mode and a large amount of research work for the relevance development of the environment for use from producing the factor in noise to applying the brake; However, because of the keen competition environment of the auto industry, make a large number of research results inconvenient and publish and exchange, Measures produced in inhibition vibration and noise adopted are basically all experience while causing in the project at present.
Applying the brake mechanism of the noise is studied, the present explanation can be being divided into two kinds: Surge vibration sum by oneself " Focus
(hotsPot) " Theory.
Most researchers study the noise of applying the brake in term of surging vibration by oneself, initial research shows that rubs vibration
Cause the main reason rank 7 of vibration noise of applying the brake ]. In respect to rubing mechanism, two characteristics of the coefficient of friction are quiet
Wipe coefficient p, is greater than moving the coefficient of friction pd; The coefficient of friction p is with slipping the increase of the pace Vr relatively on certain block
And reduce. The former might lead to the fact the system to glue slipperily (Stick a Slip) The phenomenon but the latter causes the systematic one to be defeated by the damping effect, when own damping of the system is not very great, systematic vibration may be dispersed, cause the vibration noise. But because defy vibrant research to only involve rubing the friction characteristic of pair by oneself, therefore, fail to well solve the brake Vibration noise question. The 1971 Spur [the research of 81 showed: P with vr have nothing to do, apply the brake noise can take place still, on the contrary, p one Vr curve shoulder slope heavy friction packs of characteristic can initiate noise of applying the brake perhaps either very. And Has also proved the brake to the drum type and a type, even. It is a constant, the noise can still take place to apply the brake.
Some experimental study embodiments indicate too that only consider rubing one pair of characteristics and can't describe far that apply the brake in the mechanism emerging in noise, For example the experimental study of Rhee shows: Rise as rubing the interface temperature, is rubed the membrane ownly to take shape, rub the department Count and remain stable, and apt to scream instead at this moment. The branch of the mechanism of the vibration noise is that another explanation applies the brake " Focus (hetsPot) " The theory, this theory thinks it causes the vibration noise that the surface of brake disc produces the focus in the course of applying the brake. It find judder frequency and vehicle pace test with " The focus " The figure is correlated with. Further prove. Caused by the change of a thickness, and hotjudder is by " focus " Cause. To " focus " Analyses further involve there aren't it,analyze can calculate for steps an " focus "s different as records of type brake structure close theory model The critical speed distributed, i.e. unstable speed.
Correspond to different steps time have different critical speed, and frequency does not change within the range of certain speed; This Outside, theory critical speed obtained to analyze often very high, with apply the brake, scream, take place in middle knot of low-speed often this Fruits are inconsistent too. Have only discussed the geometirc size (one is thick) of one in theory model To critical speed Influence, this can't solve the noise problem of real applying the brake far. Up till now, " focus " There is not the research of the theory
In terms of analyze model but also a finite element model to the actual brake" The focus " Emulation the getting getting more more complete still,still more No See the report that the actual issue concerned solved. Most literature is based on reality, probe into and inhibit the noise question from increasing the angle of systematic damping, for example add and separate shaking slice to the brake. It is effective to increase the high-frequency noise question that the damping inhibits the noise from directed primarily to frequency above SKHzing, because of the complexity of damping modeling, still nobody analyzes from the theory the angle divides the damping method at present Analyse, how to confirm damping size, the position and research how to realize in structure to still need to different situations Further work.
Research approach of vibration sum noise of applying the brake
Up until now, people have already analyzed and tested hologram, laser Doppler's analysis, finite element Modal technology,etc. introduce to the vibration of the brake and in the noise research, have made a large number of achievements. Holographic license Looks technology has shown to people the vibrant true shape in the course of applying the brake; Unity of finite element and modal analysis,
Make it become possible to set up the vibrant mathematical model that accorded with reality, all these setting up to brakes Count and analyze that has offered the facility.
While analyzing, synthesizing and predicting the system, need to provide the systematic dynamic characteristic. Reality at this moment .The system may not finish or be in consideration in factors such as economy, security,etc. yet, it is unable to go on through the test Prove, the need realizes this requirement with the aid of system emulation often. The so-called system emulation means that utilizes calculating The machine comes to operate the artificial model, imitate the operation state of the actual system and course changing over time, pass correctly Artificial operation observation and statistics of course, obtain artificial artificial output parameter and basic characteristic of system, with This infers and estimates the true parameter of the actual system and true performance.
附錄2
制動(dòng)器三維建模
圖1駐車(chē)制動(dòng)裝置
圖2制動(dòng)盤(pán)
圖3制動(dòng)輪圖
圖2制動(dòng)盤(pán)
圖3制動(dòng)鉗
圖4制動(dòng)輪
圖5盤(pán)式制動(dòng)器裝配圖
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