High-resolution inverse synthetic aperture radar (ISAR) imaging and recognition of ship target is very important for many applications. Although the principle ISAR on sea same as that flying in sky, former usually has more complex motion (fluctuation with oceanic waves) than latter, which makes compensation difficult. However, change phase chirp rate caused by ships will deteriorate azimuth focusing quality. In this paper, we first model cubic terms (parameterised its rate), then a new...

The thin walled metal plates (TWMP) on top of a commercial vehicle body are easy to produce vibration and booming noise under the action high-speed airflow, which reduces sound quality inside vehicle. Therefore, effective control TWMP is very important for comfort performance. Based experimental, finite element, dynamic fluid techniques, method identification, analysis optimization airflow proposed in this paper. problem frequency, source cause identified by amplitude-frequency...

The western mining areas of China, which are rich in coal resources, lack water resources. Large-scale and high-intensity China’s has led to the loss groundwater Underground reservoirs mines an effective means achieving protection utilization resources these areas. One important standards for safety underground reservoir a mine involves checking whether development cracks pillar dam body, under dual stress conditions overlying strata lateral pressure, passes through body or its top bottom...

Space–time adaptive processing (STAP) is a crucial technique for the new generation airborne radar with high air-to-ground performance. The authors study this applied to early warning (AEW) radars various array orientations, which include sideways looking (SLAR) and non-sideways radar. First, ground clutter characterised by showing angular-Doppler spectra Doppler-range relation orientations. Secondly, impact of configurations pulse repetition frequencies (PRFs) on STAP performance use...

Vibrations that occur in various engineering structures have potential damage to the structural system. An important system is intelligent structure containing magnetostrictive materials. To suppress vibration of structure, an active control model established for based on giant material. The law disturbance feedforward and state feedback applied combined with actuator. Numerical examples systems are performed under operating conditions sinusoidal initial excitation. isolation effect...

This study focuses on the narrow-band radar imaging for high-speed spinning targets. Based time–frequency characteristic of echoed signal, a novel coherent spectrogram redistribution method, single range Doppler interferometry (CSRDI), is proposed, which capable generating high-resolution imagery by applying phase matched processing. Furthermore, approach performs well at low signal-to-noise ratio. The rate error also taken into consideration and an estimation based focal entropy proposed....

In wideband radar imaging, it is necessary to increase the target observation angle, that is, imaging time obtain high azimuth resolution. For wide-angle targets, however, migration through resolution cell will occur and Doppler information of scatterers be varying, which can lead image defocusing in both range domain if range–Doppler (RD) method applied. Aimed at this problem, study builds up model for steadily moving targets with a constant rotation axis. Then compares RD algorithm,...

The explosion products, such as shock waves, fragments and heat energy formed by explosion, act on the plate structure, which may cause structural damage, material failure even phase transformation of material. In this paper, damage mechanism protective effect near-field blast load sandwich structure based foam-nickel core were studied. Firstly, test was conducted to investigate response subjected from 8701 explosive at position. deformation characteristics stress history acting location...

Abstract Lightweight design of leaf springs is conducive to reducing fuel consumption and improving vehicle comfort. The weight spring can be reduced obviously by using composite material. Stiffness damping are the key factors that affect properties spring. influence glass fiber laying angle volume content on stiffness was analyzed through experiment simulation. results show related content. When number layers constant, shows a nonlinear decreasing relationship with angle, coefficient...

Anesthetic management of patients with renal cell carcinoma tumor thrombus in the inferior vena cava (IVC) is challenging. This paper reports experience anesthesia a patient advanced accumulation IVC, right atrium, and pulmonary artery who underwent radical nephrectomy removal assisted by cardiopulmonary bypass. The emboli, measuring approximately 3 × 6 cm left 4 13 main artery, were removed completely. During incision IVC under systemic heparinization, significant blood loss occurred...

Abstract The decoupling analysis of vertical vibration and pitching is the basis improving vehicle comfort performance realizing body control. In order to study coupling behavior vibration, characteristics suspension are analyzed through mathematical modeling tests. research shows that front rear suspensions key factors affecting between vibration. By controlling difference ξ square rotating radius product distance from center mass axles, correlation can be reduced effectively. Through...

Industrial Internet of Things (loT) brings more innovation space to the construction machinery industry. However, currently application IoT in vibratory roller is mainly reflected on remote control asset security and basic data monitoring equipment operation. In order improve intelligent level promote compaction road construction, a parameters management system for designed developed this paper. By analyzing process based technology, specific required by are determined, including rolling...

The clutter characteristics of bistatic airborne radar are more complex than those monostatic radar. spectra not only vary severely with range, but also configuration. problem range dependence is serious in In this paper, the geometry arbitrary configuration firstly analysed, and a formula for Doppler frequency calculation variables azimuth angle deduced, which an efficient tool analysis. Because severe dependence, processing compensation indispensable space time adaptive (STAP). However,...