發(fā)布時(shí)間：2018-06-05 21:50

  本文選題：液壓互聯(lián)懸架 + 臺架試驗(yàn)��； 參考：《湖南大學(xué)》2016年碩士論文

【摘要】：液壓互聯(lián)懸架可以提高車輛的越野性能,即改善車輪接地性能和車身所受扭轉(zhuǎn)載荷。與傳統(tǒng)穩(wěn)定桿相比,液壓互聯(lián)懸架系統(tǒng)的單個(gè)車輪運(yùn)動產(chǎn)生的作用力可以通過液壓介質(zhì)流動方式轉(zhuǎn)移到其他車輪,在特定的車身-車輪運(yùn)動模態(tài)下可獲得優(yōu)越的動力學(xué)性能。該系統(tǒng)具有的非線性剛度和阻尼特性,使得車輛在具有較好的舒適性、操縱穩(wěn)定性的同時(shí),獲得卓越的越野性能。目前學(xué)術(shù)界對互聯(lián)懸架的研究主要集中在增強(qiáng)車輛的抗側(cè)傾效果,或提高舒適性,但在增強(qiáng)車輛越野性能,改善輪胎接地力方面的研究還不多見。本文通過仿真分析和試驗(yàn)研究的方法,研究了液壓互聯(lián)懸架增強(qiáng)車輛越野性能的機(jī)理,對比分析了不同懸架形式之間越野性能的差異,開發(fā)了某款越野車的液壓互聯(lián)懸架樣車,并進(jìn)行了相應(yīng)的實(shí)驗(yàn)室試驗(yàn)和道路試驗(yàn)。本文主要研究內(nèi)容和創(chuàng)新點(diǎn)如下:(1)建立液壓互聯(lián)懸架中的液壓系統(tǒng)單元理論模型與動力學(xué)特性分析,為車輛性能研究提供理論基礎(chǔ)。在液壓互聯(lián)懸架的外特性研究中,首先對液壓系統(tǒng)單元結(jié)構(gòu)中流量-壓力特性進(jìn)行瞬態(tài)建模分析,建立液壓系統(tǒng)單元數(shù)學(xué)模型。其次,進(jìn)一步通過臺架試驗(yàn)驗(yàn)證了數(shù)學(xué)模型的準(zhǔn)確性,表明該液壓系統(tǒng)單元模型能夠準(zhǔn)確反映液壓系統(tǒng)在受到外界不同激勵(lì)作用下各參量的變化,為整車動力學(xué)研究提供理論支撐。最后對液壓系統(tǒng)中的阻尼力等力學(xué)特性進(jìn)行了仿真分析,獲取了液壓系統(tǒng)關(guān)鍵參數(shù)對阻尼特性的影響規(guī)律。(2)建立匹配液壓互聯(lián)懸架系統(tǒng)的整車動力學(xué)時(shí)域模型并進(jìn)行整車越野性能仿真分析�；谝簤合到y(tǒng)單元模型建立匹配液壓互聯(lián)懸架的整車機(jī)械液壓耦合的動力學(xué)時(shí)域模型,研究了扭曲模態(tài)下車身-車輪的運(yùn)動關(guān)系,對比分析了不同懸架系統(tǒng)的車輛在扭曲模態(tài)下,車身受到的附加扭轉(zhuǎn)載荷以及車輪的接地性能。驗(yàn)證了整車的側(cè)傾剛度目標(biāo)要求與越野性目標(biāo)要求兩者之間可以有效的平衡,液壓參數(shù)設(shè)計(jì)有較大的自由空間。(3)對液壓互聯(lián)懸架試驗(yàn)車和橫向穩(wěn)定桿的原車進(jìn)行實(shí)車的越野性能試驗(yàn)。分析不同懸架系統(tǒng)下的前后軸側(cè)傾角的絕對差值,車身附加扭轉(zhuǎn)載荷和車身質(zhì)心垂向加速度;分析結(jié)果表明,與傳統(tǒng)懸架相比,液壓互聯(lián)懸架在提高側(cè)傾穩(wěn)定性的同時(shí),具有更優(yōu)越的越野性能。綜上所述,本文開發(fā)了某款越野車的液壓互聯(lián)懸架樣車,研究了液壓互聯(lián)懸架增強(qiáng)車輛越野性能的機(jī)理,并進(jìn)行了道路試驗(yàn),為懸架的匹配設(shè)計(jì)提供一定的指導(dǎo),具有實(shí)際的應(yīng)用價(jià)值。
[Abstract]:The hydraulic interconnected suspension can improve the off-road performance of the vehicle, that is, improve the grounding performance of the wheel and the torsional load on the body. Compared with the traditional stabilizer, the force generated by the single wheel motion of the hydraulic interconnected suspension system can be transferred to other wheels through the hydraulic medium flow mode, and the dynamic performance can be obtained under the specific body-wheel motion mode. The nonlinear stiffness and damping characteristics of the system make the vehicle have better comfort and maneuvering stability, and obtain excellent off-road performance at the same time. At present, the research on interconnected suspension mainly focuses on enhancing the anti-roll effect or improving the comfort of the vehicle, but the research on enhancing the off-road performance of the vehicle and improving the tire earthing force is rare. By means of simulation analysis and experimental study, this paper studies the mechanism of the hydraulic interconnected suspension to enhance the off-road performance of the vehicle, compares and analyzes the differences of cross-country performance among different suspension forms, and develops a hydraulic interconnected suspension prototype of a certain type of cross-country vehicle. Laboratory tests and road tests were carried out. The main contents and innovations of this paper are as follows: (1) the theoretical model of hydraulic system unit and the analysis of dynamic characteristics of hydraulic interconnected suspension are established, which provides a theoretical basis for the study of vehicle performance. In the study of the external characteristics of the hydraulic interconnected suspension, the transient modeling and analysis of the flow-pressure characteristics in the hydraulic system unit structure are carried out, and the mathematical model of the hydraulic system unit is established. Secondly, the accuracy of the mathematical model is verified by the bench test, which shows that the unit model of the hydraulic system can accurately reflect the variation of the parameters of the hydraulic system under different external excitations. It provides theoretical support for vehicle dynamics research. Finally, the mechanical characteristics of the hydraulic system such as damping force are simulated and analyzed. The influence of key parameters of hydraulic system on damping characteristics is obtained. The time-domain model of vehicle dynamics matching hydraulic interconnected suspension system is established and the off-road performance of the whole vehicle is simulated and analyzed. Based on the unit model of hydraulic system, the dynamic time-domain model of the mechanical-hydraulic coupling of the whole vehicle matching the hydraulic interconnected suspension is established, and the kinematic relationship between the body and the wheel in the twisted mode is studied. The additional torsional load on the vehicle body and the grounding performance of the wheel are compared and analyzed in the torsional mode of the vehicle with different suspension systems. It is verified that there is an effective balance between the objective requirement of roll stiffness and the requirement of wild target. The hydraulic parameter design has a large free space.) the off-road performance tests of the hydraulic interconnected suspension test vehicle and the original vehicle with the transverse stabilizer rod are carried out. The absolute difference of front and rear axle roll angle, the additional torsional load and the vertical acceleration of body mass center under different suspension systems are analyzed, and the results show that compared with traditional suspension, the hydraulic interconnected suspension not only improves the roll stability, but also improves the stability of the suspension. Has superior cross-country performance. To sum up, this paper develops the hydraulic interconnected suspension prototype of a certain cross-country vehicle, studies the mechanism of the hydraulic interconnected suspension to enhance the cross-country performance of the vehicle, and carries out road tests to provide some guidance for the matching design of the suspension. It has practical application value.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：U463.33

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本文編號：1983516