【正文】
另一個(gè)例子: 發(fā)現(xiàn) 汽車的車架結(jié)構(gòu)的一部分 受力過大 。通常車輛設(shè)計(jì)目標(biāo)是建立 NVH對(duì)客戶和市場(chǎng)的目標(biāo)為基礎(chǔ)的特點(diǎn) , 這些目標(biāo)通常表現(xiàn)在主觀評(píng)分條款。動(dòng)態(tài)特性的研究目的是使主體結(jié)構(gòu)和主體模態(tài)最優(yōu)化。在此 同時(shí),還應(yīng)當(dāng)具有合適的有合理動(dòng)態(tài)特性,用來控制震動(dòng)和噪音。 然后進(jìn)行正常的模型分析,以考慮輪胎的影響 不平衡和發(fā)動(dòng)機(jī)怠速激發(fā)。對(duì)于靜態(tài)強(qiáng)度分析,安全系數(shù)為 。 以上是車身裝配完的頻率范圍。 汽車的設(shè)計(jì)目的是 在 不同的約束下的最佳 效果 。 。 除了正面和側(cè)面碰撞模擬,仿真,如乘 客、 安全氣囊 、 方向盤設(shè)計(jì) 、 座椅和安全帶設(shè)計(jì) 、 kneebolster設(shè)計(jì) 、 保險(xiǎn)杠設(shè)計(jì)等 。發(fā)動(dòng)機(jī)的激勵(lì)頻率 取決于氣缸數(shù)和空轉(zhuǎn)時(shí)的轉(zhuǎn)速。 ( 2)彎曲(模仿旅客和行李的重量)負(fù)荷的大小可以根據(jù)乘客和行李的數(shù)量重量來估計(jì)。 在本文中,作者用 的計(jì)算在強(qiáng)度和剛度 彎扭工況。此外,能夠縮短研發(fā)研發(fā)周期,降低成本。通常情況下 ,第一汽車主體體的自然頻率在 20 40Hz之間不等。 低于 125赫茲的噪聲和振動(dòng)問題通常必須處理重大的結(jié)構(gòu)性變化,如額外的橫梁,增援,梁截面尺寸。因此 其他結(jié)構(gòu)構(gòu)件可以隨時(shí)修改而增加不必 要 的成本。這些變化 率稱為設(shè)計(jì)靈敏度系數(shù)。 我們充分利用汽車的 NVH分析 。 共 5 頁 第 3 頁 駕駛中的汽車主體需要承受很大的激震。該主體的關(guān)鍵是汽車零件的組裝。 簡(jiǎn)介 汽車公司正在集中精力研發(fā)主要是面向市場(chǎng)新的或時(shí)尚高質(zhì)量并且便宜而又速度快的汽車。 根據(jù)我們的經(jīng)驗(yàn),如果汽車具有足夠高的扭轉(zhuǎn)剛度,它會(huì)擁有合適的抗彎剛度。通常,為了研究受力效果,我們可以把這些附件看作剛體。這些設(shè)計(jì)參數(shù)通常被稱為設(shè)計(jì)變量,可以用來表示 車蓋 厚度,梁橫截面尺寸,軸頸軸承尺寸,等等。 Noise and vibration concerns below 125 Hz must usually be dealt with by major structural changes such as additional cross members, reinforcements, and beam section sizes. Above 125 Hz, vehicle interior noise is usually the main concern and can be dealt with by local design modifications such as panel beads and damping treatments. 5. Crashworthiness Simulation and Design A main goal in automotive development is to achieve an optimum in passive safety, . to protect the car passengers during a crash as well as possible. This goal leads to increasing safety design efforts in the early development phases, synonymous with an increasing use of numerical simulation tools. The successful car body crashworthiness simulations lead to a new partnership between test and analysis teams with the goal to reduce cost and delay of new car model design. Except simulate front and side crash, extended simulation, such as occupant, airbags, steering wheel design, seat and seat belt design, kneebolster design, bumper design, etc. In our pany, we have simulated full frontal rigid barrier. Sensitivity and Optimization The aim of the car design is to get an optimal construction under different constraints. Design sensitivity analysis putes the rates of change of structural responses with respect to changes in design parameters. These design parameters are usually referred to as design variables and can be used to represent shell thickness, beam cross sectional dimensions, journal bearing sizes, and so on. Design optimization analysis is a