20春学期《现代设计方法》在线平时作业3

adminhan

平面梁单元的每个节点有（ ）个自由度。
A:1
B:3
C:6

<font face="Arial">动力机的容量通常是指其（&nbsp;&nbsp;&nbsp; ）的大小。<br /></font>
A:转矩<br />
B:功率<br />
C:转速<br />
D:传动比

设某种设备的寿命<span>T服从指数分布，其失效率</span><em><span>l</span></em> 为<span>10</span>^{<span>-</span>4}/h，则可靠度为<span>0.90时的工作寿命为（<span>&nbsp;&nbsp; &nbsp;</span>）。</span>
A:<span lang="PT-BR" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: PT-BR; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-font-kerning: 1.0pt">1000h</span>
B:<span lang="PT-BR" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: PT-BR; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-font-kerning: 1.0pt">1054h</span>
C:<span lang="PT-BR" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: PT-BR; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-font-kerning: 1.0pt">1200h</span>
D:<span lang="PT-BR" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: PT-BR; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-font-kerning: 1.0pt">1500h</span>

<p><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">图示电动机的工作制，对应下面哪一种？</span></p><p><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><img height="174" alt="" width="239" src="http://file.open.com.cn/ItemDB/66457/1400471a-f4ad-4a67-90e7-706ae22bef38/201032185713518.jpg" /></span></p>
A:<div>短时工作制</div>
B:断续周期性工作制
C:连续工作制

<div>（&nbsp;）可以通过分析产品的功能与成本的相对关系，以最低的费用提供用户所需要的功能。</div>
A:<div>综合创造原理</div>
B:<div>&nbsp;分离创造原理</div><div></div>
C:<div>移植创造原理</div>
D:<div>物场分析原理</div>
E:<div>&nbsp;还原创造原理</div><div></div>
F:<div>价值优化原理</div>

<font face="Arial">布置传动系统时，一般把带传动安排在传动链的（&nbsp; ），由于在传递同样大小功率时，转速高则转矩小，传动带所受拉力减小，外廓尺寸也随之减小，对减小带传动的弹性滑动和速度损失及提高传动带的寿命均有利<br /></font>
A:A) 低速端<br />B) 高速端
B:A) 低速端<br />B) 高速端

<font face="Arial">利用对未知系统的外部观测，分析该系统与环境之间的输入和输出，通过输入和输出的转换关系确定系统的功能、特性所需具备的工作原理与内部结构，这种方法称为（&nbsp; ）。 </font>
A:<font face="Arial">&nbsp;黑箱法 <br /></font>
B:列举法<br />
C:移植法 <br />
D:筛选法

<font face="Arial">将有可能实现该功能要求的工作原理、工艺动作及实现该运动的基本机构和组合机构尽可能按层次罗列出来，进行排列组合；再按可行性、先进性、方便性、经济性逐个分析审查，淘汰不适合的。这种设计方法称为（&nbsp; ）。 <br /></font>
A:黑箱法&nbsp;<br />
B:&nbsp;列举法<br />&nbsp;
C:移植法 <br />
D:&nbsp;筛选法

将研究对象的各个部分、各个方面和各种因素联系起来加以考虑，从整体上把握事物的本质和规律，从而寻求新的创造的原理是（ &nbsp;&nbsp;）。
A:<div>综合创造原理</div>
B:分离创造原理
C:&nbsp;移植创造原理
D:物场分析原理
E:还原创造原理
F:价值优化原理

<p><font face="Arial">图示电动机的工作制，对应哪一种？</font></p><p><img height="188" alt="" width="275" src="http://file.open.com.cn/ItemDB/66457/46bdb878-24e1-4a75-a771-cb836982e5a2/20103219045350.jpg" /></p>
A:<font face="Arial">短时工作制<br /></font>
B:断续周期性工作制
C:连续工作制

<p>下图中的x¹点为（&nbsp;），x²点为（<span>&nbsp;&nbsp; </span>），x³点为（<span>&nbsp;&nbsp;&nbsp; </span>）。</p><p><img height="186" alt="" width="242" src="http://file.open.com.cn/ItemDB/66457/3da05611-e6f9-4eb1-8ebe-ae6525c265bb/201032195550501.JPG" /></p>
A:<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt">可行设计点</span>
B:<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt">非可行设计点</span>
C:<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt">极限设计点</span>

以下关于设计的概念正确的是（&nbsp;）。
A:<p><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: 'Times New Roman'"><font face="Arial">设计是从思维到实现的过程。</font></span></p>
B:<font face="Arial">&nbsp;设计是一种思维活动。<br /></font>
C:设计就是创造性的劳动。<br />
D:设计可以提供人们所需求的产品。

<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: 'Times New Roman'">常用的平面单元中，三角形单元采用双线性位移模式，计算精度差；矩形单元采用线性位移模式，计算精度高。</span>
A:错误
B:正确

<font face="Arial">一个机械系统可能有多个不同的动力、执行或其他系统。</font>
A:错误
B:正确

<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt">内点惩罚函数法的惩罚因子在迭代过程中递增。</span>
A:错误
B:正确

<font face="Arial">一个机械系统必须由动力系统、执行系统、传动系统、操纵控制系统、架体支撑系统几部分组成。</font>
A:错误
B:正确

<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt">混合惩罚函数法的惩罚因子与内点法相同，在迭代过程中递增。</span>
A:错误
B:正确

<font face="Arial">机械设计学强调从机构学的观点来看机器的组成，因为这更有利于和设计过程中的工作特点相协调。</font>
A:错误
B:正确

<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: 'Times New Roman'">应用有限元法求解复杂的实际问题，可以得到精确解。</span>
A:错误
B:正确

<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt">当目标函数乘以一个正的常数c,<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt">如min{f(x)}<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt">变为min{cf(x)},<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt">其优化结果（指设计方案）会增大c</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt">倍</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: 'Times New Roman'">。</span></span></span></span>
A:错误
B:正确

<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt">优化设计中，设计变量的个数小于优化设计空间的维数。</span>
A:错误
B:正确

<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-font-kerning: 1.0pt; mso-ascii-font-family: 'Times New Roman'">设问探求法被称为&ldquo;创造技法之母&rdquo;。</span>
A:错误
B:正确