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发表于 2011-5-26 23:03:11
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本帖最后由 holmeskn 于 2011-5-26 23:04 编辑
Exchangeability and technical measurement
firstly , let me correct a small mistake ,this course isn`t called exchangeability ,it is about economic .its named interchangeability, it is about machinery .it mean that ,there is a group of same parts ,we can use each of them without repair or select. and the technical measurement is about measuring unit and symbol ,how to describe the precision on the drawing and the size marking.
For example , Over surplus cooperate （interference fit）过盈配合 transitional cooperate ( transitional fit )过渡配合 Clearance cooperate(clearance fit)间隙配合。I use some picture to explain these . fixed fit 固定配合 relative motion 相对运动
Coaxial degrees同轴度parallel 平行 smooth plane 光滑平面tolerance 公差upper deviation上偏差Lower deviation下偏差
roughness 粗糙度
coaxial degrees同轴度
basic hole system 基孔制（常用use different shaft to fit same hole, because shaft easy to process ） basic shaft system 基轴制
taylor principle 泰勒原则(shaft : minimum real size bigger than minimum limit size .hole: maximum real size smaller than maximum limit size. )
Electron technique
This course introduce some gate circuits. integrated circuit集成电路
Binary,二进制 Decimal十进制, Hex十六进制
Gate（ A*B and gate &与门 A+B or gate >=1或门 not gate 1 o非门）
Truth table 真值表
Simplification简化
Karnaugh map 卡诺图
Diode 二极管
its semiconductor. Diode has one-way conductivity. For example
oscilloscope 示波器switch开关high-level高电平low level 低电平
Triode三极管
Triode’s function is amplification. positive正极 negative 负极 voltage电压
NPN N is that Add phosphorus磷in high purity silicon高纯度硅 P is that Join boron 硼replace silicon 硅
PNP P
电子 electron
空穴 hole
Multiply乘法
Machinery engineering foundation
Automatic control technology allows us to greatly improve the control efficiency.
we learned the open-loop control system. This control method is simple, but very defective. If the system has interference, it will affect the output. （画一个图 control elements--- controlled object）
then we learned the closed-loop control system.. A closed—loop system, the input of the controlled object is dependent on the actual output. Since the output is fed back, and then subtracted from the input. For example, constant speed driving a car, 80km/h ,when we drive up the hill, the speed slow down, then the tachometer feed the speed back, then gas up. （feedback element）
routh stability criterion
it is a method for determining continuous system stability, for systems with an nth- order characteristic equation of the form. 公式见书，再举个例子
Mechanical and electrical
Synchronous motor 同步电机
Asynchronous motor 异步电机
DC motor 直流电机the dc power is connected directly to the armature conductors through the brush and commutator 换向器. the magnetic field is produced by permanent magnets永磁铁fixed on the stator the current flow on this way, from a to b, then electromagnetic force conduced by the interaction of rotor and magnetic field, so the motor can run/rotate
AC motor 交流电机Three-phase alternating current三相交流电
Revolving旋转
Everlasting magnet 永磁铁
Armature 电枢
Adapting piece 连接件
Stator定子rotor转子
Generate Electromagnetic force 产生电磁力energize rotor给转子通电
Hydromechanics
This course is elective course ,so my teacher only introduce some simple basic definitions. For example, compressibility(压缩性), the fluid have compressibility ,because between molecules 分子has spacing, we increase pressure ,the volume of fluid will be reduced. 压缩率β单位1/Pa
Expansibility(膨胀性),we increase the temperature of fluid, the volume of fluid will be increased.膨胀率β_t单位1/℃
viscosity粘度viscously粘性,it is inner friction摩擦 of fluid. velocity gradient速度梯度ladder form阶梯形式，pipe管子
Hydraulic steering
This course introduce Hydraulic Transmission and Control. it is a transmission form, it transport and control energy by liquid as medium.
control components—control or adjust the liquid pressure, flow quantity and flow direction, such as flow control valve 流量控制阀, overflow valve 溢流阀(keep constant pressure)direction reverse valve 换向阀(change liquid flow direction)
hydraulic pump液压泵its working theory is that, change the seal volume to produce pressure.
ABS(anti-lock breaking system)when you are breaking, the hydraulic pump output power to wheel ,the power just is pressure ,when the pressure increase too high to lock wheel, the overflow valve unload the pressure to unlock wheel. so the wheel will can`t be locked. maybe my explanation is not accurate ,but this is the basic theory.
Machinery design
introduce the basic knowledge about the design of every part of a machine。From the course we should know what kind of requirement we should fulfill. for example ,we should fulfill the strength(强度) rigidity(刚度)。Nowadays, the most parts are already standardized, for reduce cost and increase the interchangeability. So, this course teach us how to design the parts that are standardized.
For example, bolts ,its every size are standardized, its length width height, but the important design is the radius , because the radius decide the strength .so , if we want to design the radius of bolts ,we mast first know the load that it hold up and the material of bolts. Second we work out the real radius of bolts. Then, we find the standard radius through the machinery book.
wormwheel n. 蜗轮worm n. 蜗杆drive/transmission传动belt drive 带传动chain drive链传动
Machinery manufacturing
This course introduce some machine tools and cutting theory. we mainly learn basic theory of cutter, for example , the cutter`s geometric size. What is working cutting edge, tool face 刀面rake face 前刀面 nose of tool 刀尖 rake angle 前角clearance angle 后角。
The manufacturing theory introduce the processing of parts ,for example ,the operation , we should first process where they are easily processing?
The other benchmark 基准if we want to ensure precision of this size, we should make this position as benchmark.
Cutting theory angle and force
Jig夹具 benchmark and allocation locate
working feed n. 工作进给working surface n. 加工面，工作面workpiece peripheral speed n. 工件的圆周转速workpiece rotational frequency n. 工件的转速worktable n. 工作台主运动 main movement
主运动方向 direction of main movement
进给方向 direction of feed
进给运动 feed movement切削深度 cutting depth
前刀面 rake face
刀尖 nose of tool
前角 rake angle
后角 clearance angle主轴 spindle
Technical measurement
This course mainly introduce that the application of signal at machinery. You know every object have frequency, the machine have frequency too. The technical measurement just use this character to check the machine. For example , there is a machine, we knock it, it will shake, we can use the sensor to collect the vibration frequency. It is the machine’s natural frequency. One day if the vibration frequency of this machine have changed, we can know ,it maybe have some problem.
Of course ,it also can let me learn the machine, In witch frequency the machine can work best.
Modern design
SOLIDWORKS
Virtual model虚拟模型
Simple simulation of kinematics动力学分析
Its functions are more professional, but application is not wide
Virtual design
ADAMS
Simulate 仿真
Multi-body Dynamics 多体动力学
It can analyze the contact force between objects
CAD/CAE
Pro/E
Its model can directly lead to ADMS without correct
Its functions are more basic, but wide application
Course design
Level 2 Reducer：a reduction gear; a reduction device
Vertical 垂直 turning 变向
Bevel gear锥齿轮straight gear 直齿轮Gear shaft 齿轮轴
Header 顶盖base plate 底座 oil groove油槽cover端盖rings吊环
Drive shaft 传动轴transmission shaft
Depth深度lubrication oil润滑油bearing轴承sleeve套筒
lad
Revolving speed 转速 transmission ratio传动比drive ratio传动比
Torque 转矩
Transportation belt运输带
Add, subtract, multiply and divide 加减乘除
Programable logic controller
plc is short for programmable logic controller it's mainly used for industrial production工业生产
Power, CPU, memory, input and output interface circuit and function module are the components of plc there are many plc brands , like AB, schneider, omron and siemens，we learned siemens plc s7-200 ladder 梯形图 timer计时器instant 即时switch开关circuit changer 开关
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