摘要:
High cycle fatigue testing is required with regard to a large number of components in order to evaluate their performance and capabilities. Typically such components are mounted such that an excitation mechanism such as through use of air jets can be utilised in order to stimulate vibration. In order to isolate a desired vibration mode generally, an isolation device (5, 13) is utilised. The isolation device presents an edge (6, 15) to a node (4, 12) within the component (1, 11) in order to inhibit vibration modes other than that of interest. Unfortunately, prior isolation elements (6) tend to wear resulting in spurious results. By providing an isolation element (17) within an isolation device (13), a fatigue test arrangement (10) can be achieved in which both axial movement in the direction of a spring (21) upon which the element (17) is presented as well as lateral movement (26) can be achieved. In such circumstances less wear is presented to the isolation element (17). Furthermore, abutment pressure can be adjusted through use of a tensioner mechanism 16 to ensure that appropriate abutment pressure is presented to maintain isolation of the desired vibration mode for test purposes.
摘要:
An apparatus for testing flip-chip packages has a programmed computer (100), a test-engine stage (130) for applying an impact to at least one package (110) under test, and a monitoring stage (140). The test-engine stage (130) causes an impact on the package (110) on the side opposite its ball-grid array. The test-engine stage (130) has actuators connected to the test-engine stage (130) and the computer (100), for moving and aligning the test-engine stage (130). The monitoring stage (140) has a digital camera (300) connected to the computer (100) for transmitting digital images from the ball-grid array side of the package (110) to the computer (100). A microscope (290) is preferably connected to the digital camera (300). A sample stage (120) located between the test-engine stage (130) and the monitoring stage (140) holds the package (110 under test. The sample stage (120) has an acoustic transducer (190) capable of being removably connected to the package (110) under test. The acoustic transducer (190) is connected to the computer (100) for transmitting signals from the acoustic transducer (190) to the computer (100).
摘要:
A testing apparatus for onsite creation of cured sample liners necessary for confirming proper rehabilitation of pipelines includes a testing box having a base with a plurality of upstanding side walls defining an open upper end of the testing box. The testing box also includes an electrical power control assembly and an ultraviolet light assembly. A liner support manifold is shaped and dimensioned for supporting a sample liner and for attachment to the open upper end of the testing box for exposing the sample liner to pressure and ultraviolet light. In practice, and with the sample liner secured to the liner support manifold and the liner support manifold secured to the testing box, the sample liner is exposed to pressure and UV light in a highly controlled manner allowing for replication of actual in-line curing processing.
摘要:
A system and method for measuring the deformation over time of the surface of a non- Newtonian fluid in a sampling container in response to an airjet that is applied for a specified time are disclosed. The change is the sample surface displacement is measured quantitatively by means of optical triangulation or other similar optical or electronic distance measuring device. After cessation of the airjet, gravitational forces cause the sample material to flow back to its original surface profile. Both the amplitude of the deformation displacement due to the force of the airjet and the recovered displacement, within specific time periods are characteristic of asphalt binder material with varying amounts of polymer or other additives used to control the ultimate properties and performance of the material. As a result, comparison of the quantitative measurements of control samples can allow discrimination from samples with different properties and hence different formulations.
摘要:
An orthopedic simulator is provided with an integral central manifold that provides internal routing of pressurized hydraulic fluid, compressed air, or electrical power to the actuators of the orthopedic simulator. The integral manifold is structurally coupled to support elements and resist and transfer bending and shear forces to the support elements.
摘要:
The present invention provides a method and apparatus for the measurement of the visco-elastic properties of a liquid or gel, whereby said parameters are determined by measuring the vibrations generated by an air puff on the surface of a liquid or gel. The apparatus and method are particularly suited to measure the evolution of the visco- elastic properties during the coagulation of milk during the production of curd.
摘要:
Procedure and apparatus in the control of a pneumatic load application device, said load application device comprising a pneumatic power means (3) connected to a pressure source (2) and applying a load to a test specimen (1) and a sensor (4) for measuring the effect of the load on the test specimen. In the procedure, a continuous and constant gas flow is supplied into the pressure circuit (6) of the pneumatic power means (3) and the pressure in the pressure circuit is regulated by regulating a gas flow passed out of the pressure circuit. The apparatus comprises a constant flow element (5) for maintaining a constant flow of a gas flowing from the pressure source (2) into the pressure circuit (6) of the pneumatic power means (3) and a regulator valve (7) for regulating a flow of gas flowing out of the pressure circuit of the power means on the basis of information supplied by the sensor (4).