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“V”型无阀压电泵的流阻特性（Property of Flow Resistance for Piezoelectric Pump with “V”-shape Tube）
压电泵 “V”型管 流阻特性
2009/12/28
基于扩散/渐缩管流动特性，提出一种用于无阀压电泵的 “V”型管，以满足微型全分析系统等应用需求。阐述了“V”型无阀压电泵的结构,对“V”型无阀压电泵内的流阻特性进行理论分析。通过采用有限元法对“V”型管进行模拟计算，研究“V”型管的结构参数对其流阻特性的影响。研究表明：“V”型管的分流角、扩散角以及进口宽度对其流阻特性影响较大，“V”型管的长度对其流阻特性影响较小；较大的“V”型管深度有利于提高泵...
柴油机壁流式过滤体捕集与流阻性能影响规律（Characteristics of Filtration and Flow-resistance of Wall-flow Diesel Particulate Filter）
柴油机 壁流式 微粒捕集器
2009/12/28
根据气流在柴油机壁流式微粒捕集器内的流动特点，将过滤壁面假设为由若干球状单元组成，建立了壁流式过滤体捕集过程的数学模型。研究了排气特征、过滤体结构参数对壁流式过滤体捕集及流阻性能的影响规律。结果表明，减小排气流量、增大过滤体体积等方法，既能优化捕集性能，又能优化流阻性能；减小过滤体长径比，能优化流阻性能，而对捕集性能没有影响；增大过滤壁厚度，能优化捕集性能，但会使流动性能恶化；改变排气温度和孔道宽...
臭蜣螂唇基切土减阻的力学分析（Mechanical Analysis of Clypeus Surface of Dung Beetle (Copris ochusMotschulsky) in Soil-cutting Resistance Reduction）
臭蜣螂 仿生学 三面楔
2009/11/3
对臭蜣螂头部的激光三维扫描点云进行简化处理，在三维坐标系中建立垂直平面截取部分唇基实体，并将其简化为三面楔模型，进行不同运动方向的受力分析。结果表明，在臭蜣螂挖土打洞过程中唇基有利的挖土切割方式主要为滑移切割，这种切割方式基于唇基天然的优化形状，即半圆形的刃口形状和特定的曲面变化。并发现唇基曲面形状对减小挖掘阻力具有重要作用。最后分析了臭蜣螂唇基潜在的仿生应用，其天然优化的形状和切割角的自动调节可...
轮胎压实对机具牵引阻力的影响（Effect of Wheel Traffic on Working Resistance of Agricultural Machinery in Field Operation）
保护性耕作 固定道 压实 牵引阻力
2010/2/26
研究了华北平原小麦、玉米一年两熟区固定道保护性耕作对机具田间牵引阻力的影响，对比分析了固定道与非固定道处理下机具田间作业的滚动阻力、开沟器牵引阻力和总牵引阻力。与非固定道保护性耕作时深松、小麦和玉米播种作业相比，固定道保护性耕作下机组总牵引阻力分别降低14.6%、13.3%和13.3%；滚动阻力分别降低26.9%、21.9%和19.7%，平均降低22.9%；机具牵引阻力分别降低7.5%、7.2%和...
Effects of moisture content, loading rate, and grain orientation on fracture resistance of barley grain
barley grain mechanical properties fracture resistance grain processing
2014/2/26
Force and deformation curves of agricultural materials must be provided for the proper design of harvesting and processing machineries. In this research, the fracture resistance of barley grain was me...
Impact of semitrailer tyre pressure upon passive resistance and tractor unit operation economy
lost powerspeedrollingtyre pressurefuel consumption
2014/2/26
The aim of the measurement was to establish and prove the effect of the semitrailer tyre pressure on the magnitude of power losses and energy intensity in a tractor unit operation. The measured and ca...
Measurement of potato tubers resistance against mechanical loading
potato mechanical njuries flesh darkening measurement methods tubers resistance
2014/2/27
The contribution presents a method for the determination of the potato tubers resistance against mechanical loading, the measurement results obtained with the selected potato varieties, and the compar...
Measuring of pulling resistance in machinery with passive working organs
tillage disk harrow measuring equipment field experiments
2014/2/27
A determination of the total pulling resistance of machinery is important in light of its dimensioning as well in light of energy requirements of processed operation. There are several methods to dete...