The article is devoted to consideration of issues related assessing the energy efficiency a coal mining enterprise. Coal enterprises are characterized by large volume intensive ore operations. presents possible ways saving in industry. During research, system indicators for presented. Materials and methods. proposes based on existing methods approaches efficiency. Energy consumption dependence graphs, benchmarking, pinch analysis considered as starting point. Results. study enterprises....

An urban railway is a complex technical system that consumes large amounts of energy, but this means transportation still has been obtained more and popularity in densely populated cities because its features high-capacity capability, high speed, security, punctuality, lower emission, reduction traffic congestion. The improved energy consumption environment are two the main objectives for future transportation. Electrified trains can meet these by recuperation reuse regenerative braking -...

Web transport system can be found in various applications, such as paper manufacture and printing process. Due to elasticity of web materials changing roll inertia, the challenge regarding tension control is still increasing. Moreover, handling connected driving motor through limited stiffness shafts. Non-rigid nature shafts induces un-wanted vibration system, making complicated. The presents a solution for roll-to-roll web-transport with flexible couplings. coupled motors non-rigid shaft...

The paper presents a complete generalized procedure based on the Euler-Lagrange equations to build matrix form of dynamic equations, called model, for robot manipulators. In addition, new formulation Coriolis/centrifugal is proposed. link linear and angular velocities are formulated explicitly. Therefore, translational rotational Jacobian matrices can be derived straightforward from definition, which makes calculation inertia more convenient. By using Kronecker product, set up directly in...

The significant energy consumption for railway electric transportation operation poses a great challenge in outlining saving solutions. Speed profile optimization based on optimal control theory is one of the most common methods to improve efficiency without infrastructure investment costs. paper proposes an method Pontryagin's Maximum Principle (PMP), not only find switching points three phases: accelerating, coasting, braking, and from these being able determine speed profile, but also...

Đặt vấn đề: Tạo hình thân đốt sống là một phương pháp phẫu thuật ít xâm lấn điều trị hiệu quả xẹp do loãng xương. Xẹp đa tầng cần nhiều thời gian và dụng cụ can thiệp, tiềm ẩn biến chứng, rủi ro. Phương tiếp cận chân cung có cao, giảm vật tư thuật. Mục tiêu nghiên cứu: Đánh giá kết xương bằng tạo sống. Đối tượng Nghiên cứu tiến mô tả với 61 bệnh nhân tại Bệnh viện Quân Y 121 từ 6/2023 đến 12/2023. Kết quả: Tất cả đau lưng hạn chế vận động, 2 47 (77,0%), 3 14 (23,0%). Thời 45,6 ± 15,4 phút....

The utilization of machine learning, especially deep in solving materials science issues bring an opportunity to accelerate the development process new and draw attention researchers all over world. In this work, we present our study on applying neural networks represent predict thermodynamic quantities including formation energy, convex hull distance, recognize potential thermodynamical stabile materials. We employ novel material descriptor, named orbital field matrix (OFM), determine...

Torsional vibration usually occurs in the working process of machines and equipment such as transmission drive shaft machine tool. To reduce this vibration, dynamic balancing method dual mass flywheel systems are applied. There fewer researches that used absorber for reducing torsional vibration. However, an analytical solution designing optimal parameters absorbers attached to damped main system is found be difficult complicated. This paper proposes a novel idea approximately replace...

Tracking the optimal speed profile in electric train operation has been proposed as an efficient and feasible solution for not only reducing energy consumption, but also no at costs to upgrading existing railway systems. This paper focuses on finding based Pontryagin’s maximum principle (PMP) while ensuring fixed running time, comparing saving levels cases of applying or PMP. The way determine time differs from works published is calculate total trip equal scheduled timetable exactly....

The derivation of motion equations constrained spatial multibody system is an important problem dynamics and control parallel robots. paper firstly presents overview the calculating torque driving stages robots using Kronecker product. main content this to derive inverse controllers based on radial basis function (RBF) neural network law for robot manipulators. Finally, numerical simulation controller a 3-RRR delta manipulator presented as illustrative example.

<span lang="EN-US">Tracking the optimal speed profile in electric train operation has been proposed as a potential solution for reducing energy consumption operation, at no cost to improve infrastructure of existing Metro lines well. However, needs meet fixed running time. Therefore, this paper focuses on new method determining time complied with scheduled timetable when trains track profile. The novel ensure is numerical-analytical one. Calculating accelerating ta, coasting tc,...

Parallel manipulators are characterized as having closed-loop kinematic chains. robots have received increasing attention due to their inherent advantages over conventional serial mechanism, such high rigidity, load capacity, velocity, and precision. A definite advantage of parallel is the fact that, in most cases, actuators can be placed on truss, thus achieving a limited weight for moving parts, which makes it possible move at speed. These avoid drawbacks ones make mobile platforms carry...

The paper presents a complete generalized procedure based on the Euler-Lagrange equations to build matrix form of dynamic equations, called model, for robot manipulators. In addition, new formulation Coriolis/centrifugal is proposed. link linear and angular velocities are formulated explicitly. Therefore, translational rotational Jacobian matrices can be derived straightforward from definition, which makes calculation inertia more convenient. By using Kronecker product, set up directly in...

In this paper, we present the establishment vibration equation for study of nonlinear beam effects. A illustrative example allows us to derive equations und use calculating beams.

Today, the prices of fossil fuels such as gasoline and diesel are skyrocketing, oil depletion air pollution major challenges for us auto industry in particular. Natural gas has known a potential alternative fuel internal combustion engines because its advantages octane number, which is higher than that gasoline, low heat value comparison with safety use. This paper presents study on influence squish area engine performance single cylinder natural converted engine. The obtained results...

This study analyzes the literature review of techniques for estimating Height Equivalent Theoretical Plate (HETP) values various packing structure models, ranging from theoretical to semi-empirical shortcut methods. Packing structures meshes and shapes were studied on purification benzaldehyde mixture cinnamaldehyde. The M-50, M-80, O-80, S-80 estimated using Fenske’s approach as 0.052, 0.053, 0.045, 0.056, respectively. Experiment data simulation result obtained by commercial software...