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大型试件
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  large-scale specimen
     Study of Precise Setting Method and Adjusting-controlling System for Large-scale Specimen
     大型试件的精确定位方法与调控系统的研究
短句来源
  a specimen
     In accordence with above principles, an automatical precise setting system is introduced. When a specimen of 500kg is adjusted by the system, the directional accuracy may achieve 2×10-7 rad.
     介绍了根据上述原则研制的自动精确定位系统,该系统在调整500kg大型试件时的定向精度可达2×10-7rad。
短句来源
  “大型试件”译为未确定词的双语例句
     A Method to Reconstruct CT Slices of Large Component
     大型试件CT重构的一种方法
短句来源
     Research of detecting methods of large objects by X-CT
     大型试件的X射线CT检测方法探讨
短句来源
     Fracture energy and strain field near the tip of a notch in hugs concrete specimen under compact tension
     混凝土大型试件断裂能G_F及缝端应变场
短句来源
     (3)In order to prove multi-point exciting experiment good, we employ traditional ergography(hammering method) to make experiment, peak value pick-up method to modal identification, and compare identification result by hammering method with vibration table experiment.
     在重频、密频时、在试验试件的结构巨大,需要大的能量激励才能充分激出完全模态时、在一激励点为某阶感兴趣模态的节点时,都需要用多点激励的方法。 在应用大型振动设备对大型试件进行激励时,经常会出现振源相关问题。
短句来源
     A method is found by putting together projections from several different positions to reconstruct CT slice with complete data using movement of workpiece.
     利用试件平移 ,得到不同位置的一组投影 . 把这些投影进行拼接 ,可以找到一种用完全数据重构大型试件 CT( Computerized Tomography)图像的一种方法 .
短句来源
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  相似匹配句对
     Research of detecting methods of large objects by X-CT
     大型试件的X射线CT检测方法探讨
短句来源
     A Method to Reconstruct CT Slices of Large Component
     大型试件CT重构的一种方法
短句来源
     Large Size Zoom TV Telescope
     大型变焦距电视望远镜
短句来源
     Production of Large Scrolling Wheel Casting
     大型滚轮的铸造
短句来源
     THE PLAN FOR SAMPLE NUMBER
     试件数量设计
短句来源
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  a specimen
The main advantage is the possibility of varying the radiation flux incident on the surface of a specimen under study from an external source according to any smooth law.
      
The emission spectrum of the boundary-layer vapor on the interval 3800-6600 ? is presented for a specimen of asbestos-filled plastic in the air-plasma flow created by an electrodeless high-frequency discharge.
      
The drag force exerted by the liquid on a specimen bubble of the considered system is calculated.
      
The paper deals with an automated system for measuring the thermal diffusivity of metals and alloys by a flash method involving the use of a contactless technique of recording the superheat temperature of a specimen.
      
The current density in a specimen is changed by variation in the charging voltage of capacitors, and the duration of pulses, by varying their capacitance.
      
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In order to investigate the proragation process of a crack in concrete, a photoelastic coating was used in the fracture test of huge compact tension specimens with the dimensions 3.6×3.0×0.2m, 3.0×2.5×0.2m,2.4×2.0×0.2m, 1.8×1.5×2.0m, 1.2×1.0×0.2m, and 0.6×0.5×0.2m. The pictures by video recorder illustrate a whole process of the test of specimens with initial cracking, the stable propagation and the unstable development of the main crack. The results obtained show that the length of the stable propaga tion of...

In order to investigate the proragation process of a crack in concrete, a photoelastic coating was used in the fracture test of huge compact tension specimens with the dimensions 3.6×3.0×0.2m, 3.0×2.5×0.2m,2.4×2.0×0.2m, 1.8×1.5×2.0m, 1.2×1.0×0.2m, and 0.6×0.5×0.2m. The pictures by video recorder illustrate a whole process of the test of specimens with initial cracking, the stable propagation and the unstable development of the main crack. The results obtained show that the length of the stable propaga tion of the main crack is a constant value about 200mm, independent of the dimensions of specimens and of the length of the castnotch when the thickness of specimens is larger than 1m. It was found that the initial cracking of the castnotch is dependent on the length of the castnotch. The longer the castnotch is, the earlier the initial cracking of the castnotch appears These phenomena are significant for explanation of the propagation process of crack in a large size concrete structure.

为了研究大型试件的裂缝扩展过程,本文采用光弹性贴片法对平面尺寸分别为3.6×3.0m,3.0×2.5m,2.4×2.0m,1.8×1.5m,1.2×1.0m,0.6×0.5m的大型紧凑拉伸试件,预制裂缝的起裂。确定扩展直至失稳破坏的全过程进行了系统的研究,并用录像机拍摄了光弹性贴片所显示的裂缝扩展的全过程,得到了混凝土裂缝在不同荷载阶段从起裂、稳定扩展直到失稳破坏整个全过程的完整而直观的观察结果。结果发现,在试件高度达到1m以上的实验范围内,失稳破坏前裂缝稳定扩展长度几乎是一个稳定的常数值,这个值约为200mm,它与试件尺寸初始缝长α_o无关。同时发现,宏观裂缝的起裂与初始缝长α_o有关,初始缝长α_o愈大,裂缝起裂愈早,α_o愈小,裂缝起裂愈晚。该现象对于了解像高混凝土坝那样大型结构裂缝扩展有着重要的意义。

Tensile tests for determining fracture energy of concrete were conducted on huge compact specimens having different dimensions of 3.6×3.0, 3.0×2.5,2.4×2.0, and 1.8×1.5m, with the same thickness of 0.2m. Test results show that the measured values of fracture energy of concrete are independent upon the size of the specimen, and average 498.4N/m. The strain field near the tip of a notch was measured by strain gauges up to 172 pieces, the data of which were acquired and analysed by MTS' data collection system and...

Tensile tests for determining fracture energy of concrete were conducted on huge compact specimens having different dimensions of 3.6×3.0, 3.0×2.5,2.4×2.0, and 1.8×1.5m, with the same thickness of 0.2m. Test results show that the measured values of fracture energy of concrete are independent upon the size of the specimen, and average 498.4N/m. The strain field near the tip of a notch was measured by strain gauges up to 172 pieces, the data of which were acquired and analysed by MTS' data collection system and computer system. It is found that the high strain concentration zone is a long narrow and irregular band, its shape is similar to that obtained by laser speckle photography and photoelastic coating. Moreover, it is found that there is an evident stable propagation process of a main crack in the specimen before unstable fracture occurrs. The average length of stable main crack propagation is independent upon the specimen size, and is about 200mm. The effective crack length is the sum of the length of stable crack propagation and the initial length of the notch. The effective fracture toughness of concrete K Icr is calculated based on the measured maximum load, the effective crack length by using formulas developed from liner elastic fracture mechanics. Similarly, the average value of the effective fracture toughness of concrete calculated in this way is also independent upon the size of specimen and is 2.563MPam~(1/2).

本文采用平面尺寸分别为3.6×3.0,3.0×2.5,2.4×2.0,1.8×1.5m的大型紧凑拉伸试件测试了混凝土断裂能G_F,结果表明,在所试验的试件尺寸范围内,所测试的断裂能G_F是一个与试件尺寸无关的稳定常数值,其平均值为498.4N/m.采用大面积布置电阻应变片测点辅以高速的计算机数据采集系统求得缝端应变场分布,其高应变集中区为一狭长的带状形,形态与光弹性贴片法和激光散斑法所得结果相一致,由上述方法发现:大型试件在失稳断裂前存在着主要裂缝的稳定扩展过程,其稳定扩展长度与大型试件的试件尺寸无关,平均值约为200mm.对此进行有效裂缝长度修正后求得的等效断裂韧度K_c也与本文的试件尺寸无关,其平均值为2.56MPam~1/2。

When a large-scale specimen is set on the heavy-duty precision instrument precisely,the mechanical creep and drift will be caused by the adjustingcontrolling system.In this paper the authors analyse deeply the mechanism of the creep and drift. Meanwhile,the unanimous principle and function separating principle are put forward in order to realize the precise setting. In accordence with above principles, an automatical precise setting system is introduced. When a specimen of 500kg is adjusted by the system, the...

When a large-scale specimen is set on the heavy-duty precision instrument precisely,the mechanical creep and drift will be caused by the adjustingcontrolling system.In this paper the authors analyse deeply the mechanism of the creep and drift. Meanwhile,the unanimous principle and function separating principle are put forward in order to realize the precise setting. In accordence with above principles, an automatical precise setting system is introduced. When a specimen of 500kg is adjusted by the system, the directional accuracy may achieve 2×10-7 rad.

本文深入分析了在大型精密仪器上对大型试件精确定位时,调控系统产生机械"爬行"和机械"漂移"的机理;提出了实现精确定位的状态一致原则和功能分离原则。介绍了根据上述原则研制的自动精确定位系统,该系统在调整500kg大型试件时的定向精度可达2×10-7rad。

 
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