Hydraulic Power Unit and Servo control System for an Existing Actuator

需要资金购买一个每分钟90加仑的液压动力装置和一个伺服控制系统。它们将取代现有的液压动力装置，它的能力不足(每分钟10加仑)，以及过时的伺服控制系统。所要求的设备将允许利用现有执行器的全部能力，创建足够的加载系统，该加载系统能够：(1)实现1459 kN的最大压缩载荷和960 kN的最大拉伸载荷，(2)在进行观察和测量时保持恒定载荷，(3)施加动态载荷，以及(4)进行载荷控制和位移控制测试。目前考试制度的局限性是这四名申请者研究计划的主要障碍。他们测试的负载要求需要充分利用执行器的能力。新的控制系统允许进行位移控制测试，从而为预期的负载水平提供了关键的安全措施。进行动态测试的能力对于几个研究项目至关重要，例如形状记忆合金(SMA)，因为它们的行为受到加载速度的影响。目前需要新加载系统的研究项目包括：(1)利用SMAS的独特性能来实现地震后需要小修的可持续结构，(2)评估腐蚀对钢桥构件局部屈曲稳定性的影响，(3)开发一种更容易建造、更便宜的新预制剪力墙系统，以及(4)开展使用复合纤维增强聚合物和新型合金混合方案加固的混凝土管道以及延性超高性能混凝土的研究。现有的装载系统没有技术支持和更换部件，这使得对大量HQP(列在申请者表格100中)的研究面临很大风险。申请者有必要的资金来操作和维护所要求的设备。一名全职技术人员可以操作、维护和管理这一急需的装载系统。

Funds are requested to purchase a 90-gallon per minute hydraulic power unit and a servo control system. They will replace the existing hydraulic power unit, which has an inadequate capacity (10 gallons per minute), and an outdated servo control system. The requested equipments will allow utilizing the full capabilities of an existing actuator, creating an adequate loading system that can: (1) achieve a maximum compressive load of 1459 kN and a maximum tensile load of 960 kN, (2) maintain a constant load while making observations and taking measurements, (3) apply dynamic loads, and (4) conduct load-control and displacement-control tests. The limitations of the current testing system are a major hurdle for the research programs of the four applicants. The load requirements for their tests require utilizing the actuator to its full capacity. The new control system allows conducting displacement-control tests, thus providing a critical safety measure for the expected level of loads. The ability to carry out dynamic testing is essential for several research projects, for instance on Shape Memory Alloys (SMAs) since their behaviour is affected by the rate of loading. The immediate research programs that require the new loading system include: (1) utilizing the unique properties of SMAs to achieve sustainable structures that need minor repair following exposure to earthquakes, (2) assessing the effect of corrosion on the local buckling stability of steel bridge members, (3) developing a new precast shear wall system that is easier and cheaper to construct, and (4) conducting research on concrete pipes reinforced using hybrid schemes of composite fibre-reinforced polymers and novel alloys, and on ductile ultra-high performance concrete. Technical support and replacement parts are not available for the existing loading system, which puts the research studies of a large number of HQP (listed in Forms 100 of the applicants) at a great risk. The applicants have the necessary funds for the operation and maintenance of the requested equipments. A full-time technician is available to operate, maintain, and manage this critically needed loading system.