实验七 机构设计与分析软件的应用.doc

实验七 机构设计与分析软件的应用一、实验目的：1、结合机构分析设计软件，学习掌握运动分析的解析法求解。2、应用机构分析设计软件，进行凸轮机构的设计分析。3、学会应用AUTOCAD软件进行运动分析矢量图的绘制。二、实验步骤：1、登录 访问机构设计分析软件。2、点击了解该软件的基本功能。3、学习掌握解析法进行连杆机构的运动分析（教师讲解）。并对一特定机构进行运动分析，求出速度、加速度。详见实验要求。三、实验要求：1、已知图示铰链四杆机构各杆的长度lAB=25mm; lBC=60mm; lCD=40mm; lAD=60mm. AB杆的角速度11rad/s，角加速度10。求（1）该机构是否存在曲柄？简单说明理由。25+60 40+60 满足杆长条件； AB为最短杆且为连架杆，该四杆机构为曲柄摇杆机构，所以存在曲柄。（2）若存在曲柄，用AUTOCAD作图，绘制出极限位置。标注极位夹角。并与软件获得的结果进行比较。（3）用ECXEL软件进行解析法方程的求解。每隔10计算一次，获得AB旋转一周，CD杆的角速度3和角加速度3的变化情况，并获得变化曲线图。与软件获得的结果进行比较。（4）每个学生选择其中一个位置（教师指定），用图解法进行速度和加速度分析，求得该时刻CD杆的角速度3和角加速度3。要求用AUTOCAD绘制速度矢量图和加速度矢量图。并与解析法获得的结果进行比较。四、撰写实验报告运动分析 1.图解法速度矢量图 加速度矢量图 速度分析：已知AB杆的角速度11rad/s，角加速度10。 =25mm/s. 根据 =+， 画出速度矢量图。 加速度分析：从速度矢量图中求得，=19.87mm/s，=9.88mm/s 。 =9.87 ，=25 ，=1.627根据 = + = + + ，画出加速度矢量图 =9.88mm/s， =0.165rad/s=19.87mm/s， =0.497rad/s由加速度矢量图得=12.36 ，=13.59 计算得角加速度 =0.309，=0.22652. 解析法； ； 利用ECXEL软件进行解析法方程的求解，得到表格如下：角度弧度ABC弧度弧度角速度角速度角加速度角加速度0001.4-0.38751.2903490.695307-0.71429-0.714291.467690060.352700712100.174444-0.173561.415177-0.364731.1900730.578315-0.61655-0.427671.732843410.711947068200.348889-0.341851.460247-0.297131.1413890.48217-0.48443-0.13561.562335260.760442719300.523333-0.499771.533842-0.186741.13980.40875-0.360810.1070291.209693170.642929965400.697778-0.642521.633728-0.036911.1750690.354828-0.261730.2873840.868344110.494678562500.872222-0.765761.7568740.147811.236960.316029-0.186680.4144530.601800450.37156773601.046667-0.865761.899540.361811.3173510.288627-0.130060.5015950.407913960.283070668701.221111-0.939482.0573980.5985971.4102910.269913-0.086220.5598870.267714080.223761697801.395556-0.984682.2256550.8509821.5114670.258063-0.050720.5970620.163174190.186325233901.57-12.3992041.1113061.6176640.251924-0.020280.6180970.08079110.1650390671001.744444-0.984962.5727771.3716651.7263520.2508390.0075730.6259780.011052160.1560792791101.918889-0.940032.7411051.6241581.835390.2545280.0347520.622298-0.05268550.1570411111202.093333-0.866562.899081.861121.9428290.2630170.0628470.607678-0.11496630.1663323251302.267778-0.766783.0419062.0753592.0467670.2765860.0931860.582112-0.17847070.1825249131402.442222-0.643743.1652482.2603712.1452680.2957210.1268160.545304-0.2437320.203627181502.616667-0.501153.2653612.4105422.2363530.3210570.1643270.497097-0.30854210.2263372021602.791111-0.343353.3392072.5213112.3180630.3532730.2055850.437985-0.3676410.2456163251702.965556-0.175133.3845452.5893182.3886190.3929380.2494550.369592-0.41366470.2551977511803.14-0.001593.3999992.6124982.4466370.4403290.2937210.294818-0.43994830.2493978431903.3144440.1719923.3850982.5901472.4913240.4952640.3354040.217398-0.4441110.2254700992003.4888890.3403573.3402962.5229452.5225440.5570160.37140.140956-0.42981080.1847091792103.6633330.498393.2669532.4129292.5407110.6243570.3991090.068045-0.40516190.131268792203.8377780.6412953.1672942.2634412.5465510.6956730.416728-0.00033-0.37928620.0696848532304.0122220.7647353.0443452.0790182.5408330.7690960.423123-0.06465-0.35963320.0028895652404.1866670.8649622.9018381.8652572.5241420.8425960.417473-0.12646-0.351191-0.068510362504.3611110.9389342.7440981.6286472.4967280.9139950.398867-0.18801-0.3570175-0.146052382604.5355560.9844062.5759131.376372.4584080.9809260.365976-0.25197-0.3790992-0.232936822704.710.9999972.4023891.1160832.4085071.0407350.316802-0.3213-0.4188609-0.333515052804.8844440.9852352.2287920.8556882.3458131.0903470.24854-0.39917-0.4768726-0.452572042905.0588890.9405672.0603920.6030882.2685661.126130.157612-0.48863-0.5510923-0.593723383005.2333330.867351.9023010.3659512.1745291.1437920.040173-0.59187-0.6322897-0.755473983105.4077780.7678051.7593160.1514742.0612951.138448-0.10632-0.70819-0.6944248-0.922435833205.5822220.6449541.635779-0.033831.9271191.105127-0.27943-0.82973-0.6788443-1.049467983305.7566670.5025271.535438-0.184341.7727421.040199-0.46491-0.93455-0.4823562-1.045137753405.9311110.3448461.461341-0.295491.6044440.944109-0.62939-0.980760.00648764-0.790977623506.1055560.1766971.415735-0.36391.4370550.82469-0.72419-0.916310.75864878-0.25901953606.280.0031851.400005-0.387491.2926310.697584-0.71539-0.718951.458139810.343184067由表获得折线图：从表中得，=时，=0.164327rad/s ，=0.497097rad/s =0.2263，=-0.3085图解法中已经求得， =0.165rad/s ，=0.497rad/s =0.2265 ，=0.309 从图解法矢量图中可看出，与方向相反，所以值为负，也为负。对比