Optimization of Clamping and Conveying Device for Sunflower Oil Combine Harvester Header

To solve the problem of grain spatter during harvest by combine harvester headers, a new clamping and conveying device of the sunflower oil harvester header was designed. We investigated plant states during the conveying process. To optimize the parameters of the sunflower oil harvester header, a test bench was built to simulate sunflower plant harvest. The influence of the clamping gap, clamping speed ratio, and clamping length on conveying success rate was explored by a single-factor experiment. Based on this experiment, the secondary regression orthogonal rotation test was carried out. The optimal structural parameter combination was obtained as follows: the clamping gap was 20 mm, the clamping speed ratio was 1.3, and the clamping length was 345 mm. Under this combination parameter condition, the corresponding conveying success rate reached up to 85.16% and the minimum value of conveying grain loss rate was 1.57%. To verify the effect of parameter optimization, a verification test and a comparison test were performed. Results showed that the actual conveying success rate was 83.50% and the actual grain loss rate was 1.49%, which were close to the optimized parameter value. The comparison test showed that the conveying success rate of the flexible clamping and conveying device was 83.50% with a grain loss rate of 1.49%, and that of the rigid clamping and conveying device was 55% with a grain loss rate of 5.17%. This study provides a theoretical basis for the design of a low-loss sunflower oil combine harvester header.

The Bounded Traveling Wave Solutions of a (3+1) Dimensions mKdv-ZK Equation

The bounded traveling waves solutions of a (3+1) dimensions mKdv-ZK equation be investigated by using method of dynamical systems. The exact expressions of bounded periodic waves, solitary waves and kink waves are given. Under fixed parameter condition, the planar simulation graphs of the bounded periodic waves, solitary waves and kinks are obtained by using the software Mathematica 7.

Algorithms for CRT-variant of Approximate Greatest Common Divisor Problem

The approximate greatest common divisor problem (ACD) and its variants have been used to construct many cryptographic primitives. In particular, the variants of the ACD problem based on Chinese remainder theorem (CRT) are being used in the constructions of a batch fully homomorphic encryption to encrypt multiple messages in one ciphertext. Despite the utility of the CRT-variant scheme, the algorithms that secures its security foundation have not been probed well enough.In this paper, we propose two algorithms and the results of experiments in which the proposed algorithms were used to solve the variant problem. Both algorithms take the same time complexity $\begin{array}{} \displaystyle 2^{\tilde{O}(\frac{\gamma}{(\eta-\rho)^2})} \end{array}$ up to a polynomial factor to solve the variant problem for the bit size of samples γ, secret primes η, and error bound ρ. Our algorithm gives the first parameter condition related to η and γ size. From the results of the experiments, it has been proved that the proposed algorithms work well both in theoretical and experimental terms.

Torus and Subharmonic Motions of a Forced Vibration System in 1 : 5 Weak Resonance

The Neimark-Sacker bifurcation of a forced vibration system is considered in this paper. The series solution to the motion equation is obtained, and the Poincaré map is established. The fixed point of the Poincaré map is guaranteed by the implicit function theorem. The map is transformed into its normal form at the fifth-order resonance case. For some parameter values, there exists the torus T1. Furthermore, the phenomenon of phase locking on the torus T1 is investigated and the parameter condition under which there exists subharmonic motion on the torus T1 is determined.

Equivalent Conditions of a Hilbert-Type Multiple Integral Inequality Holding

Let ∑i=1n1/pi=1pi>1, in this paper, by using the method of weight functions and technique of real analysis; it is proved that the equivalent parameter condition for the validity of multiple integral Hilbert-type inequality ∫R+nKx1,⋯,xn∏i=1nfixi dx1⋯dxn≤M∏i=1nfipi,αi with homogeneous kernel Kx1,⋯,xn of order λ is ∑i=1nαi/pi=λ+n−1, and the calculation formula of its optimal constant factor is obtained. The basic theory and method of constructing a Hilbert-type multiple integral inequality with the homogeneous kernel and optimal constant factor are solved.

A thermally tunable single-band metamaterials with VO2 disks based on localized surface plasmon resonance

A thermal tunability metamaterial absorber with single-band absorption properties is proposed and numerical verification. An absorption peak can be revealed at resonant wavelength 1.54 m at room temperature. The metal parameter condition is optimized in simulation in order to improve the property of this absorber. Simulated results reveal that absorption performances can be modulated based on the refractive index changes. High FOM values are obtained based on water or glucose solution. Moreover, the resonance wavelength and amplitude are modulated based on the ambient temperature changes. Finally, the effect of central metal particle side width or dielectric layer thickness at room temperature on absorption performances are also revealed in simulation.

Optimization of Engine Performance and Emission for Various n-Butanol Blends at Different Operating Parameter Condition Using MADM Technique

In present work, optimization of engine performance and emission were performed for different butanol diesel blends (5–20%) for various engine operating parameter using Taguchi DoE with AHP Optimization Technique. Single cylinder VCR Engine (CI) was fueled with different blend of diesel and butanol and tested for various CR, FIP and FIT at different load conditions (Idle, 1/3, 2/3 and full load). First 3-D interaction plot is drawn to understand the effect of different engine parameter on butanol-diesel blend combustion at different load conditions for NOx and Smoke formation. It’s observed that result vary with changes in operating parameter with different load conditions. Hence to optimize the engine operating parameter setting for correct butanol blend for all load conditions, AHP optimization with Taguchi DoE is performed and it’s found that butanol blend of 15% with CR of 15, FIP of 260bar and FIT of 25°bTDC is optimum combination to get lowest emission with good engine performance. The use of 15% butanol is found most suitable as it gives favorable engine performance and low emission for all test load conditions.

The Jacobi Stability of a Lorenz-Type Multistable Hyperchaotic System with a Curve of Equilibria

In this paper, a 4D Lorenz-type multistable hyperchaotic system with a curve of equilibria is investigated by using differential geometry method, i.e. with KCC-theory. Due to the deviation curvature tensor and its eigenvalues, the curve of equilibria of this hyperchaotic system is proved analytically to be Jacobi unstable under a certain parameter condition, and a periodic orbit of this system is proved numerically to be also Jacobi unstable. Furthermore, the dynamics of contravariant vector field near the curve of equilibria and the periodic orbit are studied, respectively, and their results comply absolutely with the above analysis of Jacobi stability.