發(fā)布時(shí)間：2018-05-20 16:08

  本文選題：南方丘陵地區(qū) + 混合動(dòng)力�。� 參考：《福建農(nóng)林大學(xué)》2017年碩士論文

【摘要】：采伐機(jī)的排放差、能耗高、能源的利用率低等,在當(dāng)今緊缺化石能源和環(huán)境日益惡化的情境下,研究采伐機(jī)的節(jié)能技術(shù)具有非常重大的現(xiàn)實(shí)意義。采伐機(jī)的動(dòng)力系統(tǒng)中普遍采用"全燃油"方式,而且國(guó)內(nèi)的采伐機(jī)大多數(shù)是直接引進(jìn)國(guó)外產(chǎn)品,受到我國(guó)丘陵地區(qū)復(fù)雜地形的影響,動(dòng)力性能上會(huì)受到制約,導(dǎo)致運(yùn)行工況不穩(wěn)定、整機(jī)振動(dòng)大。本文取消了"全燃油"方式,采用串聯(lián)混合動(dòng)力系統(tǒng)方案,探討了混合動(dòng)力采伐機(jī)的模型,研究了采伐機(jī)結(jié)構(gòu)強(qiáng)度,分析了采伐機(jī)行駛的穩(wěn)定性。本文的研究方法和結(jié)果如下:1.根據(jù)南方丘陵地區(qū)的自然地形情況,提出了采伐機(jī)的基本性能要求,并采取八只輪子、混合動(dòng)力技術(shù)措施。經(jīng)過(guò)國(guó)內(nèi)外的機(jī)型探討,分析國(guó)內(nèi)外采伐機(jī)的結(jié)構(gòu)形式,最終確定混合動(dòng)力采伐機(jī)參考模型,提出了采伐機(jī)底盤的基本尺寸參數(shù)。2.通過(guò)對(duì)比不同混合動(dòng)力系統(tǒng)布局,確定出最終的布局方案,對(duì)動(dòng)力部件進(jìn)行匹配與選型;借助AVL Cruise軟件對(duì)比分析混合動(dòng)力系統(tǒng)和傳統(tǒng)動(dòng)力系統(tǒng),表明混合動(dòng)力采伐機(jī)性能優(yōu)于傳統(tǒng)采伐機(jī),驗(yàn)證了所設(shè)計(jì)的混合動(dòng)力系統(tǒng)是可行的。3.根據(jù)第四強(qiáng)度理論和材料的撓度分析,提出車架的強(qiáng)度和剛度的評(píng)價(jià)準(zhǔn)則。借助HyperWorks軟件對(duì)車架的兩個(gè)典型工況進(jìn)行靜力學(xué)分析,得到車架的最大應(yīng)力值和最大變形量都低于評(píng)價(jià)準(zhǔn)則。分析車架不同姿態(tài)的自由模態(tài),對(duì)比計(jì)算出評(píng)價(jià)準(zhǔn)則,表明車架能很好的避開(kāi)共振頻率,驗(yàn)證了車架設(shè)計(jì)的合理性和可靠性。4.利用輪胎與土壤深陷和附著關(guān)系,計(jì)算出采伐機(jī)底盤越障的極限高度;借助ADAMS軟件驗(yàn)證采伐機(jī)越障的極限高度;借助拉格朗日方程推導(dǎo)出采伐機(jī)振動(dòng)系統(tǒng)的運(yùn)動(dòng)微分方程,設(shè)置不同系數(shù)和運(yùn)行速度,研究混合動(dòng)力采伐機(jī)質(zhì)心處的加速度和垂直位移的運(yùn)動(dòng)規(guī)律,得出最有利于采伐機(jī)底盤行駛的條件。5.利用Fischertechnik公司的機(jī)器人構(gòu)建部件,搭建采伐機(jī)底盤的簡(jiǎn)化模型,研究采伐機(jī)底盤簡(jiǎn)化模型以相同速度運(yùn)行在光滑瓷磚路面、細(xì)砂石路面和粗瀝青路面的振動(dòng)情況,以不同速度運(yùn)行在粗瀝青路面的振動(dòng)情況,驗(yàn)證了前文對(duì)采伐機(jī)底盤分析的可行性。借助動(dòng)力學(xué)理論和軟件仿真手段,設(shè)置不同參數(shù)的對(duì)比分析,提高了南方丘陵地區(qū)混合動(dòng)力采伐機(jī)底盤的動(dòng)力性能,實(shí)現(xiàn)了節(jié)能減排的目的,保證了結(jié)構(gòu)的強(qiáng)度,提升了行駛的穩(wěn)定性。同時(shí),驗(yàn)證了混合動(dòng)力采伐機(jī)底盤模型的可行性,探索了適合我國(guó)南方丘陵地區(qū)混合動(dòng)力采伐機(jī)底盤設(shè)計(jì)和分析方法,為今后開(kāi)發(fā)新的林業(yè)機(jī)械底盤的研究提供了借鑒。
[Abstract]:Because of the poor emission, high energy consumption and low energy efficiency of cutting machines, it is of great practical significance to study the energy-saving technology of cutting machines under the circumstances of the shortage of fossil energy and the worsening of the environment. In the power system of cutting machines, "all fuel oil" is widely used, and most of the domestic cutting machines are imported directly from foreign products, which are affected by the complex terrain in hilly areas of our country, and the dynamic performance will be restricted. Lead to unstable operating conditions, large vibration of the whole machine. In this paper, the model of hybrid electric cutting machine is discussed, the structure strength of cutting machine is studied, and the driving stability of cutting machine is analyzed by using the scheme of series hybrid power system instead of "all fuel oil". The research methods and results are as follows: 1. According to the natural terrain in the southern hilly area, the basic performance requirements of the cutting machine are put forward, and the technical measures of eight wheels and hybrid power are adopted. The structure of cutting machine at home and abroad was analyzed and the reference model of hybrid electric cutting machine was determined. The basic dimension parameter of chassis of cutting machine was put forward. By comparing the layout of different hybrid power systems, the final layout scheme is determined, the power components are matched and selected, and the hybrid power system and the traditional power system are compared and analyzed with the help of AVL Cruise software. The results show that the performance of hybrid cutting machine is better than that of traditional cutting machine, and the designed hybrid power system is feasible. According to the fourth strength theory and the deflection analysis of the material, the evaluation criteria of the strength and stiffness of the frame are put forward. Based on the static analysis of two typical working conditions of the frame with HyperWorks software, the maximum stress value and the maximum deformation value of the frame are all lower than the evaluation criterion. By analyzing the free modes of the frame with different postures and comparing the evaluation criteria, it is shown that the frame can avoid the resonance frequency well, and the rationality and reliability of the frame design are verified. Based on the relationship between tire and soil, the limit height of cutting machine chassis is calculated, the limit height of cutting machine is verified by ADAMS software, and the differential equation of motion of vibration system of cutting machine is deduced by means of Lagrange equation. By setting different coefficients and running speed, the motion law of acceleration and vertical displacement at the center of mass of hybrid electric cutting machine is studied, and the conditions that are most favorable for driving on the chassis of cutting machine are obtained. The simplified model of cutting machine chassis is built by using the robot of Fischertechnik Company. The vibration of cutting machine chassis is studied in the smooth ceramic tile pavement, fine sand pavement and coarse asphalt pavement at the same speed. The vibration of coarse asphalt pavement running at different speeds verifies the feasibility of the chassis analysis of cutting machine. By means of dynamic theory and software simulation, the dynamic performance of the chassis of hybrid electric cutting machine in southern hilly area is improved by setting different parameters, and the purpose of energy saving and emission reduction is realized, and the strength of structure is ensured. Improved driving stability. At the same time, the feasibility of the chassis model of hybrid electric cutting machine is verified, and the design and analysis method of chassis suitable for hybrid electric cutting machine in southern hilly area of China is explored, which provides a reference for the future research of developing new forestry machinery chassis.
【學(xué)位授予單位】：福建農(nóng)林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：S776

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