设计简介
摘 要
转动惯量是刚体转动时惯性的度量，其大小体现了刚体转动时状态改变的难易程度。凡是涉及到转动动力学的问题，转动惯量均为重点测量参数。在国防工业中，各种导弹需要测量其极、赤道转动惯量，用以确定导弹的起始扰动和飞行稳定性
[1]。获得物体转动惯量一般通过两种方式：对于形状简单、密度分布均匀的物体，一般采取理论计算法
[2]；而形状复杂、质量分布不规则的物体，则采取实际测量法。实际测量则主要利用弹性元件组成振荡系统，通过获得物体转动惯量一般通过两种方式：对于形状简单、密度分布均匀的物体，一般采取理论计算法
[3]对于复摆法测量转动惯量，文献[5]指出，被测件长径比大于
15时，其影响不可忽略；而当垂直和平行角度偏差大于20分时，也应考虑纵轴与转轴的垂直度和平行度的影响；文献[6]中，当摆角60°时，测量振动周期误差为±6.8%，转动惯量误差达0%。三线扭摆法用于测量大质量被测件时被测件旋转夹紧立置使得安装困难，且存在安全隐患
[7]；同时，大型被测件立置不稳，亦影响测量精度。单线扭摆法存在同样的问题。落体法对于大质量、大冲量的被测件，精度只能达到3%
[8]。文设计了一套扭摆测量系统，避免了大型被测件的立置，结构简单，易操作，且精度高，适用于大型回转体被测件的测量。
ABSTRACT
In order to meet the needs of the market display case, the design briefly introduces 1440L horizontal design of closed-end situation of food refrigerated display case, which use refrigerant R22, discusses the advantages of food refrigerated display case and its development prospects. For the better design, first refrigerant and refrigeration compressors were analyzed and compared. Refrigerant, I brieflyintroduce its development, physical parameters and their impact on the environment, from the comprehensive considerations; finally I am sure to regard the R22 as a refrigerant. Compressor, I analyze and compare the development of various types of compressors, general application and the size of cooling capacity, determine the use of piston compressors compressor-based design according to cooling capacity on demand, I make a new design for condenser and evaporator, which improved product performance .Based on the design,by the design arameters required to choose the right fan, throttle bodies and auxiliary equipment. Refrigerant refrigeration cycle by thermodynamic calculation, design and calculation of condenser and evaporator design calculations, design and calculation of the capillary, select the compressor, fan, eventually checked. KEY WORDS 。Showcase/Condenser/Evaporator/Refrigeration Cycle
转动惯量检测仪设计说明书
目录
摘要 ------------------------------------------------------------------------1
一、引言--------------------------------------------------------------------3
1.1转动惯量检测仪课题背景------------------------------------ -------3
1,2转动惯量国内外发展现状--------------------------------------------4
二、方案设计
2.1 转动惯量检测仪的方案选择…………………………………………………………....5
2.1.1 方案一…………………………………………………………………………………….6
2.1.2方案二……………………………………………………………………………………..7
2.1.3主动惯量检测仪总体方案拟定…………………………………………………10
三、产品设计计算----------------------------------------------------------21
3.1冷凝器的设计计算---------------------------------------------- 22
3.2 蒸发器的设计计算-----------------------------------------------23
五、设计总结-------------------------------------------------------26
参考文献---------------------------------------------------------27
致谢-----------------------------------------------------------------------29
转动惯量是刚体转动时惯性的度量，其大小体现了刚体转动时状态改变的难易程度。凡是涉及到转动动力学的问题，转动惯量均为重点测量参数。在国防工业中，各种导弹需要测量其极、赤道转动惯量，用以确定导弹的起始扰动和飞行稳定性
[1]。获得物体转动惯量一般通过两种方式：对于形状简单、密度分布均匀的物体，一般采取理论计算法
[2]；而形状复杂、质量分布不规则的物体，则采取实际测量法。实际测量则主要利用弹性元件组成振荡系统，通过获得物体转动惯量一般通过两种方式：对于形状简单、密度分布均匀的物体，一般采取理论计算法
[3]对于复摆法测量转动惯量，文献[5]指出，被测件长径比大于
15时，其影响不可忽略；而当垂直和平行角度偏差大于20分时，也应考虑纵轴与转轴的垂直度和平行度的影响；文献[6]中，当摆角60°时，测量振动周期误差为±6.8%，转动惯量误差达0%。三线扭摆法用于测量大质量被测件时被测件旋转夹紧立置使得安装困难，且存在安全隐患
[7]；同时，大型被测件立置不稳，亦影响测量精度。单线扭摆法存在同样的问题。落体法对于大质量、大冲量的被测件，精度只能达到3%
[8]。文设计了一套扭摆测量系统，避免了大型被测件的立置，结构简单，易操作，且精度高，适用于大型回转体被测件的测量。
ABSTRACT
In order to meet the needs of the market display case, the design briefly introduces 1440L horizontal design of closed-end situation of food refrigerated display case, which use refrigerant R22, discusses the advantages of food refrigerated display case and its development prospects. For the better design, first refrigerant and refrigeration compressors were analyzed and compared. Refrigerant, I brieflyintroduce its development, physical parameters and their impact on the environment, from the comprehensive considerations; finally I am sure to regard the R22 as a refrigerant. Compressor, I analyze and compare the development of various types of compressors, general application and the size of cooling capacity, determine the use of piston compressors compressor-based design according to cooling capacity on demand, I make a new design for condenser and evaporator, which improved product performance .Based on the design,by the design arameters required to choose the right fan, throttle bodies and auxiliary equipment. Refrigerant refrigeration cycle by thermodynamic calculation, design and calculation of condenser and evaporator design calculations, design and calculation of the capillary, select the compressor, fan, eventually checked. KEY WORDS 。Showcase/Condenser/Evaporator/Refrigeration Cycle
转动惯量检测仪设计说明书
目录
摘要 ------------------------------------------------------------------------1
一、引言--------------------------------------------------------------------3
1.1转动惯量检测仪课题背景------------------------------------ -------3
1,2转动惯量国内外发展现状--------------------------------------------4
二、方案设计
2.1 转动惯量检测仪的方案选择…………………………………………………………....5
2.1.1 方案一…………………………………………………………………………………….6
2.1.2方案二……………………………………………………………………………………..7
2.1.3主动惯量检测仪总体方案拟定…………………………………………………10
三、产品设计计算----------------------------------------------------------21
3.1冷凝器的设计计算---------------------------------------------- 22
3.2 蒸发器的设计计算-----------------------------------------------23
五、设计总结-------------------------------------------------------26
参考文献---------------------------------------------------------27
致谢-----------------------------------------------------------------------29
