Double angle formula can transform the circular function equation to a biquadratic algebraic equation,and the analysis solution can be solved by extract equation directly.

用倍角公式可將該三角函數(shù)方程轉(zhuǎn)化成一個(gè)四次代數(shù)方程，然后用求根公式直接求出解析解。

A multiple-step beams model was established to analyze the static stiffness characteristics of the double parallel four-bar mechanism with right angle flexible hinges based on the symmetry of the structure. Formula for calculating the static stiffness was derived by applying singularity function. On the basis of this analysis, the factors influencing the stiffness performance of the double parallel four-bar mechanism were studied from its geometric parameters, and the theoretical model was verified by finite element method.

根據(jù)其結(jié)構(gòu)的對稱性建立了靜剛度分析的階梯梁模型天堂在线免费视频，引入奇異函數(shù)法推導(dǎo)了柔性雙平行四桿機(jī)構(gòu)的靜剛度計(jì)算公式羞羞视频在线观看入口页面，在此基礎(chǔ)上，分析了柔性雙平行四桿機(jī)構(gòu)各尺寸參數(shù)對其靜剛度的影響2012免费观看在线播放，并采用有限元方法對理論模型進(jìn)行了驗(yàn)證能在线播放的av网址。

Firstly, this paper discusses the development actuality of the research on double-front axle steering system and power-train of automobile. Based on the structure of the design experiences from others, the kinematics formula of double-front axle steering system is fetched, and the mathematical model of optimization design of double rocking arms mechanism and steering trapezium mechanism is established by space geometry method. Considering the difference between the real steering angle from wheels and the ideal steering angle from the ideal formula as the objective function, the optimization design method of double-front axle steering system is presented.

本文首先論述了國內(nèi)外對汽車雙前橋轉(zhuǎn)向系統(tǒng)和動(dòng)力傳動(dòng)系統(tǒng)研究的發(fā)展?fàn)顩r，在總結(jié)前人研究設(shè)計(jì)經(jīng)驗(yàn)的基礎(chǔ)上推導(dǎo)出汽車雙前橋轉(zhuǎn)向系統(tǒng)運(yùn)動(dòng)學(xué)關(guān)系一级黄片二级黄，運(yùn)用空間幾何法建立了雙前橋雙搖臂機(jī)構(gòu)及轉(zhuǎn)向梯形機(jī)構(gòu)優(yōu)化的數(shù)學(xué)模型亚洲专区亚洲播放区在线视频，以轉(zhuǎn)向輪實(shí)際轉(zhuǎn)角值與理想公式求出的理想轉(zhuǎn)角值之間的誤差達(dá)到最小為目標(biāo)函數(shù)，提出了雙前橋轉(zhuǎn)向系統(tǒng)參數(shù)的優(yōu)化設(shè)計(jì)方法久久国产免费中文。

double back substitution：雙重回代

倍角公式 double angle formula | 雙重回代 double back substitution | 雙鏈條件 double chain condition

double root：二重根

double angle formula 二倍角公式 | double root 二重根 | dual 對偶

double barreled drilling：雙筒鉆井

double angle formula 倍角公式 | double barreled drilling 雙筒鉆井 | double bend 雙彎頭