微电子设备和无线传感技术有力支撑了煤矿井下设备运行状态在线监测技术的快速发展，但无线监测节点的供能问题是其发展的瓶颈。新型能量收集技术在微电子设备供电及设备状态监测等方面的应用日益广泛，有望缓解煤矿复杂环境下设备在线监测的供电难题。振动能和热能作为机械设备运行过程中必然产生的两种能量形式在煤矿设备运行过程中普遍存在，是理想的可回收能源。在前期课题组组合梁式压电俘能器研究基础上，结合热电效应收集安装壳体上的热能，论文提出一种热电-压电双模式俘能系统，以压电俘能器收集振动能量，热电俘能器作为散热及余热回收发电模块，解决煤矿井下采掘设备监测节点供电问题。通过研究压电、热电俘能机理，设计相应的俘能结构，建立系统数学模型，揭示热电-压电双模式俘能系统关键参数对系统性能的影响规律，为热电-压电双模式俘能器结构设计提供理论依据。
论文针对采掘过程安装部位振动激励宽频、多方向以及随机等特点，提出线形-拱形组合梁结构的三稳态压电俘能器。为揭示三稳态组合梁压电俘能器的非线性机理及其与系统响应之间的变化规律，依据磁化电流法建立系统的非线性磁力模型，并根据实验测量结果对系统非线性恢复力和非线性磁力分别进行讨论与分析。利用广义 Hamilton 变分原理建立压电俘能系统分布式参数模型，以高斯白噪声作为振源激励，建立三稳态组合梁压电俘能器随机动力学模型。
针对压电俘能系统动力学求解问题，采用谐波平衡方法解析并分析组合梁结构压电俘能器动力学行为，揭示简谐激励下不同磁铁距离和不同激励加速度对系统响应幅值和频带宽度的影响规律。利用基于马尔科夫扩散的 Fokker Planck Kolmogorov(FPK)方程，得到系统的响应概率密度函数，通过仿真与分析揭示随机激励下，三稳态组合梁压电俘能器在不同磁铁距离和不同激励强度时的响应特性。
针对俘能器机载时的温度环境，提出利用热电效应回收热能并采用自然风冷降低温度。基于温差发电原理的塞贝克效应，建立温差发电系统热电模型，理论分析温差发电系统的输出功率与发电效率的几种影响因素。为了增加温差发电器的冷热端温差，设计针状散热结构，通过有限元仿真并优化设计，确定系统最优结构尺寸。
最后，搭建热电-压电双模式俘能系统测试平台。在三稳态组合梁压电俘能器振动测试平台上，对俘能器施加简谐激励与随机激励，获得压电俘能器模块在不同磁铁间距、不同激励强度条件下的响应特性；在温差俘能器温度测量与发电性能测试平台上，验证降温效果及温差发电性能。实验表明：热电、压电俘能系统理论研究与实验测试基本吻合，热电-压电双模式俘能系统能有效改变单一模式供电的不足。论文为煤矿井下机电装备监测节点自供电提供了新的途径，必定会有力支撑和促进智能矿山建设中设备在线监测系统快速发展。

Microelectronics and wireless sensing technology support the rapid growth of on-line monitoring technology for coal mine machine. However, the energy supply of the sensor nodes is the bottleneck in its development. Environmental energy harvesting technology is widely used in power supply and condition monitoring of micro-electronic equipment, which is expected to alleviate the trouble of wiring and power supply for on-line monitoring of coal mine equipment. Vibration and heat are two kinds of energy forms which produced in the operation of mechanical equipment, and are common in the operation of coal mine equipment and ideal recyclable energy sources. Based on the previous research of composite beam piezoelectric energy harvesters and combined with the thermoelectric effect, a thermoelectric-piezoelectric dual-mode energy harvester is proposed in this paper. In this structure, the vibration energy is collected by piezoelectric energy harvester and the thermoelectric energy harvester is used as the heat dissipation and power generation module, to solve the power supply problem of monitoring node for equipment in coal mine. By studying the mechanism of piezoelectric and thermoelectric energy harvester, the structure is designed and the mathematical model is established. The influence of key parameters of thermoelectric-piezoelectric dual-mode energy harvester on energy collection performance is revealed, which provides a theoretical basis for the design of thermoelectric-piezoelectric dual-mode energy harvester.

Aiming at the characteristics of wide frequency, multi-direction and random vibration excitation in the installation part of the excavation process, a tri-stable piezoelectric energy harvester with linear-arch composite beam structure is proposed. In order to reveal the nonlinear mechanism of the tri-stable energy harvester system and its influence on the response, the nonlinear magnetic force model of the system is established by the magnetization current method. The nonlinear restoring force and nonlinear magnetic force of the system are discussed and analyzed according to the experimental results. Where after, based on the generalized Hamilton variational principle, the distributed parameter model of piezoelectric energy harvester system is built, and the random dynamic model of the system is established with Gaussian white noise as the excitation source.

In order to analysis the dynamics of piezoelectric energy harvester system, the harmonic balance method is utilized to analyze the dynamic behavior of piezoelectric energy harvester.

The influence of different magnet distance or acceleration on the response amplitude and bandwidth of the system under harmonic excitation is revealed. Due to the Markov diffusion[1]based Fokker-Planck-Kolmogorov (FPK) equation, the response probability density function of the system is obtained. The response characteristics of the tri-stable piezoelectric energy harvester of composite beam under random excitation are disclosed by simulation.

In view of the temperature environment when the harvester is on board, the thermal energy is recovered by the thermoelectric effect and the temperature is reduced by natural air cooling.

Based on the Seebeck effect of the principle of thermoelectric generation, the thermoelectric model of thermoelectric generation system is established. The several influencing factors of output power and generation efficiency of thermoelectric generation system are analyzed theoretically. In order to reduce the temperature difference between the cold and hot ends of the thermoelectric generator, the needle-like heat dissipation structure is designed. The structure size of the system is determined by finite element simulation and optimization design.

Finally, the test platform of thermoelectric-piezoelectric dual-mode energy harvester is is built. The harmonic excitation and random excitation are implemented in the vibration test platform of the tri-stable piezoelectric energy harvester. The response characteristics of the piezoelectric energy harvester under different magnet spacing and excitation intensity were obtained. On the platform of temperature measurement and performance test of thermoelectric energy harvester, the cooling effect and performance of the temperature difference are verified. The experimental results show that the theoretical research of thermoelectric and piezoelectric energy harvester system agrees well with the experimental test. This paper provides a new way for the self-supply of the monitoring node for equipment in coal mine, which will certainly support and promote the rapid development of the on-line monitoring system in the construction of intelligent mine.