SBIR Phase I: Feed Forward Hydraulic Ripple Cancellation

该项目更广泛的影响/商业潜力预计将在两个主要领域实现。已有广泛的努力来掩盖水力噪音，但拟议的努力旨在在水力涟漪从源头产生之前消除它。传统的被动掩盖噪声的方法是不够的，因为它们只在有限的工作范围内有效地工作。这是不够的，因为液压系统通常必须在广泛的速度和负载范围内运行。首先，该项目预计将使液压主动悬架系统更安静、更灵敏和更坚固，因此更容易和更广泛地被工业采用。因此，由此可能增加的主动悬架系统的使用将具有额外的社会效益，即提高车辆的安全性和舒适性。预计该项目还将对液压噪音产生更广泛的影响，而液压噪音几十年来一直是液压行业的一个长期痛点。它将允许制造更安静、更耐用的液压泵，用于主动悬挂以外的许多应用。这个小型企业创新研究(SBIR)第一阶段项目是对使用主动缓冲器消除液压泵(如齿轮泵)流量波动的可行性进行调查。在典型的液压系统中，齿轮泵是先进的电液主动悬架执行器的核心。由于它们的几何形状，正排量泵在泵转速恒定的情况下提供了流体流量的微小波动。流量的这些微小变化会产生压力波动，从而产生显著的机械运动，从而产生令人不快或不健康的噪音。拟议的工作专门针对减轻由这种泵引起的声学和结构振动噪声。拟议的工作将利用先进的实验和计算机模拟技术相结合的方法，在典型的液压系统(主动悬架执行器)中演示该方法的可行性。在涉及液压泵的众多应用中，液压系统噪声是一个普遍的痛点。液压泵的一个关键困难是，它们经常被要求在很大的速度和压力范围内工作。传统的噪声控制设备通常只能针对此范围中相对较窄的部分进行优化。

The broader impact/commercial potential of this project is expected to be realized in two principal areas. There have been extensive efforts to mask hydraulic noise, but the proposed effort is directed at eliminating the hydraulic ripple before it is created at the source. Traditional passive methods of masking noise are insufficient because they work effectively only in a limited operating range. This is inadequate because hydraulic systems typically must operate over a wide range of speed and loads. First this project is expected to make hydraulic active suspension systems quieter, more responsive and robust and, therefore, more readily and widely adopted by industry. The resulting likely increased use of active suspension systems will, therefore, have the added societal benefit of improved vehicle safety and comfort. This project is also expected to have a much wider impact on the hydraulic noise that has been a chronic pain point for the hydraulics industry for decades. It will allow for the manufacture of quieter and more durable hydraulic pumps for many applications beyond active suspension.This Small Business Innovation Research (SBIR) Phase I project is an investigation of the feasibility of using an active buffer to eliminate flow ripple from a hydraulic pump, such as a gerotor pump. In a representative hydraulic system, the gerotor pump is at the heart of an advanced electro-hydraulic, active suspension actuator. Due to their geometry, positive displacement pumps provide small fluctuations in their fluid flow rate at a constant pump RPM. These small changes in flow rate create pressure fluctuations that can create significant mechanical movement that results in objectionable or unhealthy noise. The proposed effort is directed specifically at mitigating acoustic and structural vibration noise caused by such a pump. The proposed effort will utilize a combination of advanced experimental and computer simulation techniques to demonstrate the viability of the approach in the representative hydraulic system (an active suspension actuator). Hydraulic system noise is a widespread pain point in numerous applications involving hydraulic pumps. A key difficulty with hydraulic pumps is that they are often required to perform over a wide range of speeds and pressures. Conventional noise control devices typically can only be optimized for a relatively narrow portion of this range.