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滑块速度
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  ram speed
     The results of the expriement comfirm that the said alloy sheet as recieved, tested at a high temperature of 900℃ with an exceedingly low ram speed of 0.5 mm/min, exhibits an elongation of 688%, 27 times as great as that obtained by ordinary tensile test.
     实验结果证实这种钛合金原材料在900℃高温以极低的滑块速度0.5毫米/分拉伸具有688%延伸率,为普通拉伸试验所得的27倍之多。
短句来源
  slide speed
     It shows that the mechanism with a simpler structure possesses fine characteristics of low-speed and quick return under lower internal stresses. The maximum speed of the slider reaches only 82 mm/s within the range of 0° to 45° crankshaft angle, and a speed flat roof in the slide speed curve is found. The speed traits of the slider are even better than that of the special cold extrusion press and drawing press with complex structures.
     优化后的结果表明,该机构的结构简单紧凑、受力性能好,具有良好的低速锻冲急回特性,在曲柄转角为0°~45°的范围内可使滑块速度最高仅为82 mm/s,并存在着一个明显的速度平台,其滑块速度特性甚至还优于结构复杂的专用冷挤及拉延压力机.
短句来源
  “滑块速度”译为未确定词的双语例句
     Then, the optimal curve of ram velocity versus stroke was determined for optimizing the microstructures of forgings through variational approach according to the results of FEM numerical simulation and material optimal trajectory.
     通过变分法根据有限元数值模拟结果和材料最优轨迹优化等温锻造用液压机滑块速度随行程变化曲线,使工件内热力参数变化接近材料最优轨迹,以获得优质的GH4169合金锻件。
短句来源
     Based on non-linear vibration equations, considering the coefficient of sliding friction of FPS bearings as the function of the sliding velocity of the slider, response of earthquake of a FPS-isolated building subject to three different records of earthquake acceleration is studied by using tool of numerical simulations provided by MATLAB. The results indicate that it is feasible to predict the responses of FPS-isolated structures simplifying coefficient of sliding friction into a constant.
     本章利用FPS基底隔震结构的非线性振动微分方程并将滑动摩擦系数视为随FPS滑块速度变化的变量,以著名的MATLAB为平台,通过数值模拟考察了采用这一滑动摩擦系数分析模型时FPS基底隔震结构在三种不同性质的地震作用下的地震响应。 计算结果表明,通常将材料的动摩擦系数简化为常数来预测摩擦摆隔震结构的地震响应是可行的。
短句来源
     The results of numerical simulation indicate that in order to obtain high quality GH4169 alloy disk forgings, it is necessary to determine the ram velocity reasonably, improve the lubrication condition and raise the dies temperature appropriately.
     大量计算结果表明,在压力机上实施DA锻造工艺时,为了获得优质GH4169合金涡轮盘锻件,应合理确定压力机滑块速度,尽可能改善润滑情况及适当提高模具预热温度。
短句来源
     This paper discusses the effects of the slider's weight and speed,temperature and joints clearance on dead-point precision of slide-block in crank-slider mechanism.
     文中讨论了曲柄滑块机构中滑块质量、滑块速度、温度和运动副间隙对滑块死点位置的影响。
短句来源
  相似匹配句对
     Design of device for measuring the running speed of sliding block
     测量滑块运行速度装置的设计
短句来源
     MATCHING SPEED
     匹配的速度
短句来源
     The speed of gravity
     引力的速度
短句来源
     Equation for working stroke and speed of rotary forging machine
     摆辗机滑块工作行程速度方程式
短句来源
     ROLLER ON SLIDE BLOCK
     滑块上的滚体
短句来源
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  ram speed
The individual effects of ram speed in extrusion and crosshead speed in tensile tests on the flow behavior of the material are analyzed.
      
It is derived that the pressure requirement for extrusion is a combined function of ram speed (or strain rate) and temperature rise.
      
The balance of the two factors gives an increase in extrusion pressure with rising ram speed-a result being different from that found in the extrusion of some other aluminum alloys.
      
For each billet and die temperature the analysis resulted in calculation of optimum ram speed, optimum die material choice and total force necessary for this upsetting.
      
The relative magnitudes of the shell and the core fibre-orientation persuasions depended on the melt and the mould temperatures, and the injection ram speed.
      
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The aims of this title are to investigate the superplastieity as well as the possibility of blow forming of TC3 titanium alloy sheets through experimental methods. A material testing machine was modified to meet the requirements of superplastic tensile test. The results of the expriement comfirm that the said alloy sheet as recieved, tested at a high temperature of 900℃ with an exceedingly low ram speed of 0.5 mm/min, exhibits an elongation of 688%, 27 times as great as that obtained by ordinary tensile test....

The aims of this title are to investigate the superplastieity as well as the possibility of blow forming of TC3 titanium alloy sheets through experimental methods. A material testing machine was modified to meet the requirements of superplastic tensile test. The results of the expriement comfirm that the said alloy sheet as recieved, tested at a high temperature of 900℃ with an exceedingly low ram speed of 0.5 mm/min, exhibits an elongation of 688%, 27 times as great as that obtained by ordinary tensile test. At the same temperature,900℃ , TC3 titanium allay sheet has also been blow formed into various intricate shapes by an internal gas pressure of 5 atm. It can be concluded that TC3 titanium alloy sheet as recieved as a fairly qualified superplastic material, and can be easily formd into any integral parts so long as it is subjected to a low gas pressure. Evidently, this new technology will offer more freedom for the design considerations in the selection of aerospace structure.

本文目的在于以实验法探讨TC3钛合金的超塑性及吹塑成形的可能性。改装了一台材料拉伸试验机,以适应超塑性拉伸的要求。实验结果证实这种钛合金原材料在900℃高温以极低的滑块速度0.5毫米/分拉伸具有688%延伸率,为普通拉伸试验所得的27倍之多。而在900℃,TC3钛合金板材在5个大气压的内部气体压力作用下能吹塑成各种复杂的形状。可以肯定地说,TC3钛合金原扳材为一相当出色的超塑性材料,只要施加低的气体压力就易于吹塑成任何整体的零件。显然,这一新工艺将为宇航结构选择上的设计构思提供更多的自由。

In this paper a mathematical model is constructed to use for the optimum designof a slider mechanism with approximately uniform velocity.According to thismodeling,the mean square error value of velocity is employed as the objectivefunction.The problem is treated by the Powell Method of the unconstrainednonlinear programming.The author takes the mechanism mentioned in literature[1]for the calculating example.The final result is obtained on the EC machineModel 709.As compared with the scheme recommended in literature[1],the...

In this paper a mathematical model is constructed to use for the optimum designof a slider mechanism with approximately uniform velocity.According to thismodeling,the mean square error value of velocity is employed as the objectivefunction.The problem is treated by the Powell Method of the unconstrainednonlinear programming.The author takes the mechanism mentioned in literature[1]for the calculating example.The final result is obtained on the EC machineModel 709.As compared with the scheme recommended in literature[1],the existingmechanism is more accurate in the uniformity of velocity.The results show thatthe difference between the maximum and the minimum velocity in an effectivestroke amounts to only 0.79% and the square sum value of the velocity deviationabout 0.000011.

本文对一种具有近似等速特性的滑块机构提出了优化设计的数学模型。该数学模型采用滑块速度的均方差作为目标函数,利用无约束最优化的 Powell 法来求解。以文献的机构为例,作者进行了计算,最后在709机上获得结果。按本文方案所设计的机构和文献的推荐方案相比较,则在速度的均匀程度方面将具有更好的条件。有效动程内最大速度与最小速度的差值只是平均速度的0.79%,速度差值的平方和只有0.000011。

The direct aged (DA) processing has become the basic processing technology to produce GH4169 alloy disk forgings for high performance aeroengines. During the DA processing, however, it is necessary to strictly control every step of forging process and employ the forging equipment with enough capacity. Referring to the finish forging process of DA processing in forging press, the upsetting processes of GH4169 billet with 520mm diameter and 190mm height under several conditions were simulated by coupled thermomechanical...

The direct aged (DA) processing has become the basic processing technology to produce GH4169 alloy disk forgings for high performance aeroengines. During the DA processing, however, it is necessary to strictly control every step of forging process and employ the forging equipment with enough capacity. Referring to the finish forging process of DA processing in forging press, the upsetting processes of GH4169 billet with 520mm diameter and 190mm height under several conditions were simulated by coupled thermomechanical finite element method. The results of numerical simulation indicate that in order to obtain high quality GH4169 alloy disk forgings, it is necessary to determine the ram velocity reasonably, improve the lubrication condition and raise the dies temperature appropriately. For the GH4169 alloy disk forgings, the isothermal DA forging process may be the best choice. The results of this study may provide a guide for DA processing of GH4169 alloy disk forgings at home.

直接时效(DA)锻造工艺已成为生产GH4169合金涡轮盘锻件的基本方法之一。但实施DA锻造工艺时,锻造过程的各个环节要求严格控制,而且要有足够吨位的设备。参照在压力机上实施DA工艺的终锻过程,用有限元变形—传热耦合分析方法对直径520mm和高度190mm的GH4169合金坯料在不同情况下的镦粗过程进行了数值模拟。大量计算结果表明,在压力机上实施DA锻造工艺时,为了获得优质GH4169合金涡轮盘锻件,应合理确定压力机滑块速度,尽可能改善润滑情况及适当提高模具预热温度。对于GH4169合金涡轮盘锻件,采用等温DA锻造工艺可能是最佳的选择。研究结果对于在国内的生产条件下实施GH4169合金DA锻造工艺具有指导作用

 
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