公开(公告)号：US06604432B1

公开(公告)日：2003-08-12

申请号：US09530662

申请日：2000-05-02

申请人： William R. Hamblen ,  Frank Berkman ,  Bill Watters

发明人： William R. Hamblen ,  Frank Berkman ,  Bill Watters

IPC分类号： G01L100

CPC分类号： E02D1/02 ,  G01H15/00 ,  G01N3/32 ,  G01N2291/02827

摘要： The in-situ measurement of the shear modulus of a surface layer of soil (12) is performed by apparatus in which a contact foot (11) with a preselected downward bias force engages a defined area of a region of soil. A drive transducer (13) shakes the contact foot (11) vertically and sensing transducers (17, 18) determine the force applied to the foot (11) and the resulting movement of the foot (11) and generate respective first and second output signals. The in-phase movement responsive output signal is analyzed in relation to the force signal to obtain a measurement of a single parameter which is representative of the stiffness provided by the soil (12). The shear modulus as well as the void ratio of the soil can be calculated from the stiffness. The drive transducer (13) is energized by an a.c. signal which progressively varies in frequency over a preselected band with the rate of change also varying with frequency thereby providing a greater force spectrum content at lower frequencies than at higher frequencies in the band, while maintaining a substantially constant force magnitude.

摘要翻译： 土壤（12）表层的剪切模量的原位测量是通过以下设备进行的：其中具有预选的向下偏压力的接触脚（11）接合土壤区域的限定区域。 驱动传感器（13）垂直摇动接触脚（11）并且感测换能器（17,18）确定施加到脚部（11）的力和所产生的脚部（11）的运动并产生相应的第一和第二输出信号 。 相对于力信号分析同相运动响应输出信号，以获得表示由土壤（12）提供的刚度的单一参数的测量。 剪切模量以及土壤的空隙率可以从刚度计算出来。 驱动传感器（13）由a.c. 信号在预选频带上频率逐渐变化，其变化率也随频率而变化，从而在较低频率处提供比在频带中的较高频率更大的力谱含量，同时保持基本恒定的力量级。

公开(公告)号：US06912903B2

公开(公告)日：2005-07-05

申请号：US10461140

申请日：2003-06-13

申请人： William R. Hamblen ,  Evan Frank Berkman ,  Estelle Watters

发明人： Bill G. Watters

IPC分类号： E02D1/02 ,  G01H15/00 ,  G01N3/32 ,  G01L1/00

CPC分类号： G01H15/00 ,  E02D1/02 ,  G01N3/32 ,  G01N2291/02827

摘要： An apparatus and method are provided for the in-situ measurement of the stiffness of a layer of soil or other surface of interest. The apparatus includes a contact foot for engaging the surface and a drive transducer coupled to the contact foot for applying a vibratory force to the contact foot in response to a drive signal. A motion sensor is coupled to the contact foot and in a preferred embodiment an additional sensor measures the force applied to the contact foot and hence to the surface. These sensors generate corresponding output signals. The output signals are used to generate a measurement signal that is representative of the surface stiffness.

摘要翻译： 提供了一种用于原位测量一层土壤或感兴趣的其他表面的刚度的装置和方法。 该装置包括用于接合表面的接触脚和耦合到接触脚的驱动换能器，用于响应于驱动信号向接触脚施加振动力。 运动传感器耦合到接触脚，并且在优选实施例中，附加传感器测量施加到接触脚并因此测量到表面的力。 这些传感器产生相应的输出信号。 输出信号用于产生代表表面刚度的测量信号。