This paper covers the design and performance of a radically new valve system now being used in semi-hermetic compressors. The discharge valve, trademarked the "Discus Valve," is made from a high temperature polymeric material. This valve, together with a unique laminated steel valve plate and a ring-type suction valve, provides large flow areas, low clearance volumes, and high efficiency. The d...

In this paper, a novel detection and quantification method of control valve stiction is discussed. A time delay estimation method is presented for processes under an oscillating state. A suitable model structure of valve stiction is chosen prior to conducting valve stiction detection and quantification. Given the stiction model structure, a bounded search space of a stiction model is defined an...

The essential objective of optimal power flow is to find a stable operating point which minimizes the cost production generators and its losses, keeps system acceptable in terms limits on active reactive powers generators. In this paper, we propose nature-inspired Cuckoo search algorithm (CSA) solve economic/emission dispatch problems with incorporation FACTS devices under valve-point loading e...

With the increasing challenges of climate change and scarce resources, development sustainable energy-efficient technical systems is becoming increasingly important. In many applications, friction losses occurring in contacts have a decisive influence on overall efficiency. At this point, tribological contact optimization can make an important contribution to efficiency systems. However, improv...

Position-controlled systems driving repetitive tasks are of significant importance in industrial machinery. The electric actuators used these responsible for a large part the global energy consumption, indicating that major savings can be made this field. In context, motion profile optimization is very cost-effective solution as it allows more energy-efficient machines without additional hardwa...

A numerical optimization of the suction valve of a large reciprocating compressor has been carried out as a case study, using a combination of a compressor simulation program and a genetic optimization algorithm. This optimization algorithm is based on the theory of biological evolution: survival of the fittest. The compressor simulation program solves the mass and energy conservation laws for ...

This paper discusses the application of evolutionary multi-objective optimization algorithms namely Non-dominated Sorting Genetic Algorithm-II (NSGA-II) and Modified NSGA-II (MNSGA-II) for solving the Combined Economic Emission Dispatch (CEED) problem with valvepoint loading. The valve-point loading introduce ripples in the input-output characteristics of generating units and make the CEED prob...

This paper presents artificial bee colony optimization for solving multi-area economic dispatch (MAED) problem with tie line constraints considering transmission losses, multiple fuels, valve-point loading and prohibited operating zones. Artificial bee colony optimization is a swarm-based algorithm inspired by the food foraging behavior of honey bees. The effectiveness of the proposed algorithm...

This paper proposes a novel and efficient hybrid algorithm based on combining particle swarm optimization (PSO) and gravitational search algorithm (GSA) techniques, called PSO-GSA. The core of this algorithm is to combine the ability of social thinking in PSO with the local search capability of GSA. Many practical constraints of generators, such as power loss, ramp rate limits, prohibited opera...

This paper deals with the optimization of a hydrothermal problem that considers a non-smooth Lagrangian L(t, z, z′). We consider a general case where the functions Lz′ (t, ·, ·) and Lz(t, ·, ·) are discontinuous in {(t, z, z′)/z′ = φ(t, z)}, which is the borderline point between two power generation zones. This situation arises in problems of optimization of hydrothermal systems where the therm...