Suction accumulator in rotary compressor is an important component from standpoints of compressor cost, performance, sound and ability of controlling excess liquid refrigerant. Because of its importance, it deserves its due attention to enhancement of its functions. This paper first defines functions of an accumulator, lists major design parameters and their common ranges. Then, a couple of maj...

Heavy metal pollution is a worldwide problem. This study was conducted in a turquoise mine in Nyshabour (Iran) to find accumulator plant(s). Concentrations of metals were determined both in the soil and the plants growing in the mine. Concentrations of total K, Ca, Na, Mg, Mn, Zn, Fe and Cu in the mine area were higher than the control soil. The results showed that four dominant vegetations nam...

This paper presents high-speed low-power small-area accumulator designs to be used in DDFS systems. To reduce the Numerically Controlled Oscillator (NCO) design complexity and size, only the most significant bits of the accumulator drive the phase to amplitude mapping block. Those bits need to be updated on every sampling clock, while the least significant bits of the accumulator are not visibl...

This study applied a model predictive control (MPC) framework to solve the cruising control problem of a series hydraulic hybrid vehicle (SHHV). The controller not only regulates vehicle velocity, but also engine torque, engine speed, and accumulator pressure to their corresponding reference values. At each time step, a quadratic programming problem is solved within a predictive horizon to obta...

This paper presents high speed direct digital frequency synthesizer (DDFS) based on pipelining phase accumulator (PA). The proposed 12-bit PA contains three pipelining stages with 4-bit carry-lookahead adder (CLA) with the carries ripple between these stages. Comparing results between similar phase accumulator designed with ripple carry adder on, Cyclone III FPGA platform reveals that the propo...

Hydraulic systems are widely used in industry due to their small size-to-power ratios and ability produce very large linear force torque. In traditional hydraulic systems, a variable pump driven by an electric motor is often as power source. these the electro-hydraulic source always operates at its rated speed, causing lots of noise low energy consumption, especially no-load light-load conditio...

Linear actuators, implemented as closed hydraulic systems, without external piping, are a state of the art drive concept, see (Gannon, 2017). Collecting data, used to train condition monitoring (CM) for such drives, running 24/7, is cumbersome or even not possible. To gain training containing valid and invalid system states, we developed simulation model, consisting most relevant physical effec...

This review article deals with hydro-pneumatic accumulators (HPAs) charged nitrogen. The focus is on HPA models used in the study of energy efficiency hydraulic systems. Hydraulic circuits are presented along their various applications for delivering required volume fluid, maintaining pressure, ensuring safe operation, safety stop, leak compensation, fluid change pulsation damping, and pressure...

Title of Document: INVESTIGATION OF REFRIGERANT DISTRIBUTION IN A HOUSEHOLD REFRIGERATOR WITH A FOCUS ON THE ROLE OF THE ACCUMULATOR Cara Sanderson Martin, M.S. Mechanical Engineering, 2007 Directed By: Professor Reinhard Radermacher, Ph.D. Department of Mechanical Engineering In order to maximize household refrigerator performance, it is important to understand the basic relationship between e...

Prosthetic feet are limited in their ability to mimic the energy-recycling behavior of an intact ankle, negatively affecting lower-limb amputees’ gait terms metabolic cost and walking speed. To overcome these weaknesses, a novel prosthetic ankle based on hydraulics is described here. The joint drives two cams, which turn drive hydraulic rams. One cam-ram system captures negative work done from ...