变幅

In this paper,the optimization of the single boom system withcompensating pulley is studied,in which the minimization of the height difference between theluffing path and the fixed level line is the optimum destination,and the boundary conditions andempiric formulas are constralnt equations.

以变幅轨迹与水平线间的高度差最小为目标，以经验设计公式和边界条件为约束函数，对平衡滑轮补偿法的单臂架系统进行优化，并以80t起重机为例进行计算。其计算结果表明：变幅轨迹曲线有了明显改善。

So it's necessary to design the briachial-bridge luffing mechanism and curve slideway live control weight gravity balance system in a new way.

而对于变幅系统和曲线滑道活对重自重平衡系统的设计，传统意义上单纯的通过建立数学模型进行优化的方式来进行设计，或者单纯的作图法来设计，在很多方面暴露出弊端，如优化得到的点离实际需要的太远，或者作图设计速度较慢等，正因为如此，有必要对变幅系统和曲线滑道活对重自重平衡系统的设计重新做出一种新的尝试。

Methods According to the specific requirements of the debridement instrument, the electronic design techniques were adopted to determine the sound intensity threshold, oscillation amplitude and near-filed distance.

根据清创机的具体要求，运用先进的电子设计手段设计变幅杆超声声强阈值、变幅杆振动幅度、传播的近场距离等。

During the operation of luffing mechanism,the load moving along a level line willsave the luffing power.

在工作性变幅过程中，吊重沿水平或近似于水平轨迹移动，可以节省变幅功率。

Traditionally, Jib system is considered to be rigidity whose process was divided into several parts. The model was built by fix-point analyse. More emphasis was put on the power of luffing gear rather than intensity condition of metal structure.

传统的作法是视臂架系统为刚性体，将其变幅过程分为几个阶段，通过定点分析，得出设计模型，设计的重点更多的关注变幅机构功率的大小，而忽视了金属结构受力的好坏。

The experimental system consists of a rotary mechanism and a luffing mechanism and is used for the simulation of luffing motion and rotating motion.

回转塔式起重机实验台由回转机构和变幅机构组成，模拟回转塔式起重机的变幅运动和回转运动。

The experiment system is consisted of transferring machine and rotary machine, to simulate the motion of transferring machine and rotary machine.

回转塔式起重机实验台由回转机构和变幅机构组成，模拟回转塔式起重机的变幅运动和回转运动。

Not only the overall scheme for the frame of this system is determined, but also the scheme for transmission of luffing motion and rotating motion is done. In addition, the design and calculations are done for driving, transmitting, hoisting, balancing jib, tower cap and dolly of luffing motion.

本文确定回转塔式起重机试验台的总体结构方案，确定变幅运动和回转运动的传动方案，设计和计算变幅运动的驱动部分，传动部分，起重臂，平衡臂，塔冒和小车。

It is widely concerned in fatigue of concrete structures. In this paper, concrete triaxial compression fatigue experiments and tension-compression fatigue experiments with constant confinements in two lateral directions have been carried out using a self-modified loading apparatus. Based on the analysis of the test data, the quantitative principles of concrete fatigue deformation and the calculation method of fatigue strength are determined.

混凝土结构的疲劳是一个广为关注的问题，本文针对这一问题结合国家自然科学基金项目——混凝土多轴变幅疲劳破坏准则(50078010)的研究，利用自制的试验加载装置完成了两向定侧压约束下混凝土三轴受压、三轴拉-压等幅和变幅疲劳试验，对试验结果进行了分析。

In accordance with size of processing die, choose the right horn and steel needle, welding steel needle into the horn by silver welding rod firmly.

使用： 根据所需加工模具的大小，选择合适的变幅杆和钢针，将钢针用银焊条牢固地焊接在变幅杆上。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。