甜菜参数综合自动检测系统

本文介绍制糖业和衣业科研必备的甜菜自动检测系统的原理、结构和设计及研制中的主要技术措施,该系统包括样品前处理、短期菜含糖率、钾、钠、ａ－氮等参数的综合测试,数据处理和全过程自动控制功能。     

精密加工中切削参数对毛刺尺寸的影响

毛刺的产生是金属切削加工中长期存在的问题,在实验的基础上通过对精密车削中进给方向毛刺的研究,分析了切削参数对毛刺尺寸的影响,为毛刺生成机理的研究以及毛刺的抑制和去除做了部分基础性工作。     

SXFA410型粗纱机锥轮形面曲线设计

借助粗纱工艺成形参数和筒管卷绕ｄ－ｎ曲线创立了设计粗纱机锥轮外形曲线的新方法,指出在粗纱机设计中工艺成形参数ｋ应等于常数。作为实例,ＳＸＦＡ４１０型粗纱机锥轮外形曲线的设计是这种方法的应用。     

复合斜纹织物踏盘开口装置的设计与应用

论述了一上一下一上二下复合急斜纹织物踏盘开口装置的设计原理,制造及安装要点,并叙述了织机相应的技术改进措施及主要织造工艺参数的确定,为成功地开发生产仿真皮皮革基布创造了条件,为企业赢得了可观的经济效益,同时也为白织厂利用有梭织机生产特殊组织结构的产业用布开辟了一条新路。     

机织物纱线滑移规律及影响因素分析

探讨机织物纱线滑移规律及影响因素。通过分析纱线滑移的形成原因,从织物组织设计、织物结构、微观受力等方面总结了纱线滑移的规律,进而从组织设计、织造参变数、织造方式三个方面分析了影响纱线滑移的主要因素,总结出解决纱线滑移问题的途径和方法。认为:通过在以上三个方面采取措施,可以有效解决纱线滑移问题,改善布面风格;同时也可利用纱线滑移规律实现特殊的织物风格。     

Study of domestic refrigerator temperature and analysis of factors affecting temperature: a French survey

A survey was carried out in France from April to June 1999. Temperatures were recorded at three levels (top, middle and bottom) of the refrigerator compartment using a data logger. A questionnaire was filled in, enabling the following information to be obtained: characteristics of the family, characteristics of the refrigerator and the use conditions. One hundred and forty-three domestic refrigerators were surveyed, but due to various technical problems, only 119 sets of recorded temperatures were exploitable. The temperatures of the surveyed refrigerators were: average 6.6 °C, minimum 0.9 °C and maximum 11.4 °C. Statistical analysis such as clustering and segmentation were used. It was found that the heterogeneousness of temperature inside each refrigerator seems to be dependent on the type. This study shows the influence of the use conditions on the temperature. No one factor exerts a single direct effect; a combination of the effects of all factors is observed.     

柴油机燃烧系统优化的一种新方法

提出了柴油机燃烧系统参数优化的一种新方法——神经网络与正交试验结合法。这种方法以较小规模正交试验数据为神经网络的训练样本,利用神经网络良好的非线性映射能力来进行燃烧系统优化性能预测,达到了与大规模试验相同的优化效果,具有试验量少、效果好的优点     

响应面优化超声波辅助水酶法提取蜡梅籽蛋白

采用超声波辅助水酶法提取蜡梅籽蛋白,探讨超声波处理时间与温度、酶用量、碱浸提液pH、酶解温度、酶解时间及料液比对蜡梅籽蛋白提取效果的影响。应用Box-Behnken设计4因素3水平的试验,依据响应面分析确定最优的提取工艺条件。结果表明,最佳提取工艺参数为:超声波处理时间15min,超声波处理温度50℃,料液比1:8,酶用量3.64%,碱浸提pH9.72,酶解温度45℃,酶解时间163min。在此条件下,蜡梅籽蛋白的得率为31.95%。     

分次谐波的一种精确检测方法

本文将Hopfield神经网络理论引入分次谐波的检测之中,推导分次谐波检测模型,并对神经网络模型中的积分参数设置方法进行了讨论。仿真结果表明该方法能够精确检测分次谐波,系统的动态特性只与积分参数的设置有关。     

Investigation of laser and process parameters for Selective Laser Erosion

The process of Selective Laser Erosion (SLE) was investigated to study the effects of different process and laser parameters on the process outputs such as surface quality and erosion rate. The SLE process is a direct method to remove material in a layer-by-layer fashion due to high energy densities provided by the laser beam. In addition to its direct use as a subtractive manufacturing method, SLE may be used in combination with layer-additive techniques such as Selective Laser Melting (SLM). Such combination mainly makes sense when both processes can be performed with the same laser. However, one of the major problems involved in SLE process is the high number of the laser and process parameters (laser power, pulse frequency, scan speed, scan spacing, ambient atmosphere, etc.) and the complexity of the relations between them which has not yet been investigated completely.This paper presents an overview of the laser erosion process with nano-second Nd:YAG laser pulses and the results of several single-factor experiments that were carried out to determine the influence of the major parameters on the depth of erosion per layer and surface roughness. Additionally, the relations between the parameters are studied to investigate the interactions between them. The results from single-factor experiments showed that some relations were highly governed by the power intensity of the laser beam and also that cross interactions between the parameters play an important role on the output characteristics. The paper explains how multiple parameters (spot size, pulse frequency, scan speed, scan spacing) can be combined to define two indirectly controlled geometrical parameters, namely the scan and pulse overlap factors. Those two parameters allow calculating the number of hits of the laser beam on a same location on the workpiece possible which is the first step in physical modeling the topography of the surface left behind.